A blast furnace smelting method for controlling w([si]) in a quantitative and modular manner

Abstract

The present application relates to a kind of coal temperature control quantitative modular precise control w ([Si]) blast furnace smelting method, belong to blast furnace smelting technical field.The method includes benchmark burden, burden calculation, parameter, index check analysis, input injection coal powder adjustment amount precise control w ([Si]) And slag iron composition, smelting and parameter control etc.Steps.The present application is based on blast furnace basic theory, blast furnace material balance and heat balance principle, solves blast furnace routine smelting time material speed-coal ratio-basicity-theoretical fuel ratio, and each smelting parameter coordination balance, w ([Si]) And slag iron composition control, smelting period and index prediction control etc.Related data influence each other processing, by 0~3 times coal adjustment can reach specified molten iron w ([Si]) Value, more is to ensure w ([Si]) It is smelted in the specified range, not only improve the degree of furnace condition smooth, also significantly reduce fuel ratio and smelting cost.The method is simple, control is fast and accurate in characteristics.Meanwhile, the method is applicable to different volume, different burden structure, with strong adaptability.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace smelting technology and relates to a blast furnace smelting method for quantitative, modular, and precise control of coal temperature regulation w([Si]). Background Technology

[0002] A low and stable molten iron temperature (w([Si])) is an important indicator of blast furnace temperature and control level. Achieving a low molten iron temperature (w([Si])) and improving its stability and uniformity, maintaining stable operation of the blast furnace, and continuously improving technical and economic indicators under specific conditions is a complex system engineering project. In terms of blast furnace operation techniques, the goal is to find effective ways to systematically, standardizedly, and accurately control blast furnace temperature and molten iron temperature (w([Si])) under different raw material conditions in blast furnaces of different volumes. This involves timely and accurate reflection of the refined and precise effects of daily adjustment methods (oxygen enrichment, pulverized coal injection) on blast furnace operation. Furthermore, quantitative and modular control of the material rate and w([Si]) quantity is implemented based on specific blast furnace smelting parameters. This ensures good matching of various smelting parameters and that adjustment factors accurately reach their target values ​​within their effective time, thereby continuously improving the stability of blast furnace operation and the stability of w([Si]), achieving smelting results that are adapted to the conditions and have good indicators.

[0003] Essentially, obtaining a low and stable w([Si]) value in blast furnace smelting, along with abundant physical heat, signifies a stable and sufficient heat and mass transfer process between the descending of the furnace charge and the rising of the gas flow. This is crucial for achieving stable blast furnace conditions, improving quality and reducing energy consumption, and ensuring safety and longevity during daily blast furnace production and smelting. The w([Si]) value reflects the hearth heat level of the blast furnace, and its stability reflects the level of heat utilization and consumption. Furthermore, within the range required for slag basicity (achieved through comprehensive calculations of the specified w([Si]) value combined with the control requirements of the main slag components), the accuracy of controlling the w([Si]) value in blast furnace also determines the composition and quality of the blast furnace and the composition and performance of the slag. In fact, a low and stable w([Si]) value in blast furnace reflects the rationality of the distribution of various charge zones within the blast furnace and the economy of the reduction reaction. Therefore, the level of control of the w([Si]) value in blast furnace is the most important indicator for measuring the technical level of blast furnace operation. The most important task for ironmaking operators is to continuously promote low-silicon and stable-silicon smelting and achieve quantitative and modular precise control of the w([Si]) value of molten iron and the composition of slag and iron.

[0004] Ironmaking is an extremely complex system engineering process. With the advancement of modern ironmaking technology and the improvement of intensification levels, the requirement for balance in the blast furnace smelting process has become even more important. In daily blast furnace production, the quality composition of raw materials, blast furnace type, and blast furnace condition are not static. With changes in external conditions and the implementation of intensified smelting, changes are inevitable. Moreover, these changes are not single-factor or linear, but rather complex changes involving multiple angles and levels, with mutual influence and correlation. Therefore, in ironmaking production, precisely controlling the charging speed and the w([Si]) value (slag-iron composition) of molten iron using oxygen enrichment and pulverized coal injection methods is a relatively complex practical operation and a constant pursuit for blast furnace operators. To a large extent, the traditional operating methods for controlling the w([Si]) of molten iron in blast furnace production still rely on simple local calculations and experience. The shortcomings of local calculations lie in the unsystematic and incomplete data collection, even relying on inaccurate instrument data for judgment. Some calculation parameters are treated as fixed values ​​or only data at the hour, failing to effectively reflect the specific state of the blast furnace smelting process. Furthermore, they cannot dynamically and in real-time consider the interrelationships of multiple factors, and the calculation process is inconsistent due to differences among operators on three shifts. In blast furnace production, to accurately control the value of molten iron w([Si]) and minimize and stabilize its fluctuation range as much as possible, a more timely, comprehensive, systematic, reliable, efficient, and accurate calculation method is needed. Data acquisition and operation should be convenient, and it is necessary to quantify, standardize, real-time, and comprehensively process the correlation calculations of this complex control process.

[0005] Currently, blast furnace equipment technology and raw material quality handling technology have made significant progress, with marked improvements in equipment reliability, instrument sensitivity, and raw material quality stability. Furthermore, the development of computer and information technology has enabled comprehensive, systematic, and accurate dynamic joint calculations in complex blast furnace smelting processes. Therefore, overcoming the shortcomings of existing operating methods in controlling molten iron w([Si]) is a pressing issue that needs to be addressed in the field of blast furnace smelting technology. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a quantitative, modular, and precise control method for blast furnace smelting of w([Si]) through coal temperature regulation. Based on fundamental blast furnace theory and the principles of overall material and heat balance, and following the principle of "quantitative, modular, and precise control of iron w([Si]) value through coal regulation," this invention forms a quantitative and modular processing mode that addresses the interrelationships between various data points in the daily intensified blast furnace smelting process, including control of coke batch quantity, hourly coal quantity, hourly oxygen enrichment, material rate, iron w([Si]) value, slag-iron composition (basicity, magnesium-aluminum ratio), smelting cycle and output, fuel ratio prediction and control, verification, and coordination and balance of various direct (indirect) smelting parameters. To accurately achieve the planned w([Si]) value during blast furnace smelting, significantly improve blast furnace operation, reduce fuel ratio and smelting costs, this invention provides a simple, comprehensive, applicable, fast, and accurate quantitative and modular precise control method for blast furnace iron w([Si]) value, effectively improving blast furnace operation technology and furnace stability.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A blast furnace smelting method for precise, modular, and quantitative control of coal temperature regulation w([Si]) includes the following steps:

[0009] A. Standard ingredients: The smelting process is ordinary ore smelting or medium titanium slag smelting.

[0010] When smelting ordinary ore, the ordinary ore furnace charge used includes the following components by mass percentage: 65-72% sintered ore, 20-28% high-silica pellets, and 0-10% low-silica lump ore; total 100%; ore batch 53,000-55,000 kg;

[0011] When smelting medium-titanium slag, the vanadium-titanium ore furnace charge used includes the following components by mass percentage: sintered ore 60-65%, vanadium-titanium pellets 30-35%, low-silicon lump ore 0-5%, totaling 100%; ore batch 320,000-34,000 kg / batch.

[0012] In the smelting of ordinary ore or medium titanium slag, the coke batch is 7200-11000 kg / batch based on dry coke weight; the coke slag batch is 450-700 kg / batch based on dry coke weight; and the pulverized coal injection rate is 21.5-48.5 t / h.

[0013] B. Ingredient calculation, parameter and index verification analysis:

[0014] B1. Benchmark ingredient calculation, parameter and index verification analysis:

[0015] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if the fluctuation range of factors in ordinary ore smelting or medium titanium slag smelting all meet the following conditions: clinker rate < ±1.0%, comprehensive furnace grade < ±0.20%, coke ash content < ±0.1%, and pulverized coal ash content < ±0.10%; then:

[0016] (1) Calculate the theoretical fuel ratio, utilization coefficient and smelting cycle;

[0017] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0018] (3) Calculate the conversion factor between the corrected air volume and the surface air volume. The oxygen enrichment rate after correcting the air volume is 2.90 to 5.00%.

[0019] B2. Verification and analysis of ingredient calculations, parameters, and indicators when key verification conditions change:

[0020] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if any one of the factors in the ordinary ore smelting or medium titanium slag smelting does not meet the following conditions: clinker rate < ±1.0%, overall furnace grade < ±0.20%, coke ash content < ±0.1%, pulverized coal ash content < ±0.10%; then:

[0021] (1) Calculate the hourly coal quantity, theoretical iron content of the batch, theoretical coal ratio, coke ratio, coke-butane ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting cycle and pulverized coal injection rate after the factors change;

[0022] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0023] C. Input the pulverized coal injection adjustment amount to precisely control w([Si]) and slag-iron composition:

[0024] The pre-control deviation of the specified w([Si]) and the actual w([Si]) is checked. If the absolute value of the difference between the specified w([Si]) and the actual w([Si]) for a single furnace iron production is less than 0.05 percentage points, the check result is that no adjustment is needed; otherwise, adjustment is needed.

[0025] The adjustment method is as follows:

[0026] (1) Collect comprehensive air supply parameters, indirect smelting parameters and fuel parameters;

[0027] (2) Based on the original amount of pulverized coal injection, input the pulverized coal injection adjustment amount to adjust the coal and obtain the new hourly coal quantity; then, through the collected comprehensive air supply parameters, indirect smelting parameters and fuel parameters, calculate the theoretical material rate, the amount of w([Si]) affected by the pulverized coal adjustment amount and the expected amount of w([Si]) after adjusting the pulverized coal quantity, and then judge the coal adjustment effect.

[0028] The judgment criteria are:

[0029] (1) After inputting the coal powder adjustment amount, the theoretically expected impact on the change in |w([Si]) is less than 0.050%;

[0030] (2)|w([Si]) 预计 -w([Si]) 规定 |<0.03%;

[0031] Specifically, when the actual w([Si]) value exceeds (or falls below) the specified w([Si]) value by more than 0.10% under normal furnace operation, the allowable coal adjustment amount is |expected w([Si]) value - actual w([Si]) value| < 0.10%;

[0032] If conditions 1) to 2) are met simultaneously, and the difference between the actual material speed after coal adjustment and the specified benchmark material speed is checked, and the result is that no adjustment is needed, then the control effect of w([Si]) needs to be checked; at the same time, the theoretical combustion temperature, blast energy, permeability index and smelting cycle after coal adjustment are calculated.

[0033] The specific method for verifying the control effect of w([Si]) is as follows:

[0034] The verification of w([Si]) and daily theoretical indicators is defined by the absolute error rate of the difference between the daily theoretical coal ratio and coke ratio and the daily actual coal ratio and coke ratio <1.50%; if both are met, the process continues.

[0035] D. Furnace smelting and parameter control:

[0036] During the smelting process, the number of times the hourly pulverized coal amount is adjusted in each shift is controlled to ≤3 times, and the daily theoretical control of molten iron w([Si]) is also controlled. 预计值 -Daily regulations w([Si]) 计划值 |<0.05 percentage points / day;

[0037] Smelting conditions: hot blast pressure 0.30~0.39MPa, top pressure 0.155~0.195MPa, hot blast temperature 1150℃~1250℃, and corrected furnace feed air volume 3200~5700m³. 3 / min, oxygen enrichment of 9400~15000m 3 / h, pulverized coal injection rate is 135-165 kg / t iron, pulverized coal injection rate is 22.0-35.0%; ore batch is 33.0-55.0 tons, coke batch is 7.2-11.0 tons on a dry basis; coke batch is 0.45-0.70 tons on a dry basis; w([Si]) is 0.055-0.35%, slag basicity is 1.10-1.18, and molten iron temperature is 1420-1480℃; during the smelting process, the slag ratio is 380-480 kg / t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag basicity is 1.10-1.18, the blast temperature is controlled to be stable, the oxygen enrichment rate is 2.90%-5.0%, and the permeability index is 18000-22000 m 3 / (min.MPa), theoretical combustion temperature 2300~2400℃, actual blowing speed 255~275m / s, actual blowing kinetic energy 17000~22000kg.m / S, theoretical hourly material rate 8.5~10.0 batches.

[0038] Further, preferably, the sintered ore composition, by mass percentage, includes 52.0–54.0% TFe, 5.5–6.5% SiO2, 13.0–13.5% CaO, 1.75–2.19% Al2O3, 2.30–2.90% MgO, 0.40–1.35% TiO2, 0.045%–0.055% S, 0.165–0.150% V2O5, and 0.045%–0.055% MnO, with the balance being unavoidable impurities, and a bulk density of 1.90–2.10 t / m³. 3 ;

[0039] The vanadium-titanium ore pellets, by mass percentage, comprise 53.5–57.5% TFe, 4.5–5.5% SiO2, 0.55–1.35% CaO, 2.20–2.90% Al2O3, 2.35–2.90% MgO, 6.40–11.0% TiO2, 0.55–0.75% V2O5, and 0.23%–0.25% MnO, with the balance being unavoidable impurities; the bulk density is 2.20–2.30 t / m³. 3 ;

[0040] The high-silica pellets contain, by mass percentage: 58.5–60.0% TFe, 6.5–7.5% SiO2, 0.5–1.5% CaO, 1.80–2.10% Al2O3, 1.0–1.5% MgO, 2.50–3.50% TiO2, 0.165–0.150% V2O5, and 0.045%–0.055% MnO, with the balance being unavoidable impurities. The bulk density is 2.15–2.35 t / m³. 3 ;

[0041] The low-silica lump ore composition, by mass percentage, includes 64.0–66.0% TFe, 3.0–4.5% SiO2, 0.03–0.05% CaO, 1.00–1.50% Al2O3, 0.01–1.0% MgO, TiO2 <1.0%, 0.030–0.050% V2O5, and 0.110%–0.160% MnO, with the balance being unavoidable impurities. The bulk density is 2.2–2.4 t / m³. 3 .

[0042] Furthermore, preferably, the coke composition comprises 84.0–86.5% C and 13.5–14.5% ash by mass percentage, with a bulk density of 0.55–0.65 t / m³. 3 ;

[0043] The coke ash composition by mass percentage includes 53.0–56.0% SiO2, 2.20–3.0% CaO, 24.0–26.0% Al2O3, 0.15–1.0% MgO, TiO2 <2.0%, 0.35%–0.45% MnO, with the balance being unavoidable impurities.

[0044] The pulverized coal composition includes, by mass percentage, 76.0-78.0% C, 13.5-15.0% ash, and 12.5-13.5% volatile matter, with a particle size of -200 mesh accounting for 66-70%.

[0045] The ash composition of the pulverized coal, by mass percentage, includes 55.0–57.0% SiO2, 5.20–6.50% CaO, 23.0–25.0% Al2O3, 2.20–2.50% MgO, TiO2 <2.0%, and 0.35%–0.45% MnO, with the balance being unavoidable impurities.

[0046] Furthermore, preferably, the comprehensive air supply parameters include: surface air volume, humidity, air pressure, top pressure, air temperature, and tuyer area; indirect smelting parameters include corrected air volume and the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast kinetic energy after correcting the air volume; fuel parameters include the batch weight, composition, and combustion rate of coke and coke briquettes before the tuyer, as well as the hourly coal powder quantity, coal powder composition, and combustion rate before the tuyer.

[0047] Furthermore, preferably, the adjustment amount of the hourly pulverized coal injection rate is less than 5.0% of the original total hourly pulverized coal injection rate.

[0048] Furthermore, preferably, it also includes step E, actual smelting result return correction: based on the actual smelting results obtained in step E, and based on the theoretical control and actual material rate, the theoretical calculation control and actual w([Si]) value, the theoretical slag and iron composition and the actual slag and iron composition, the theoretical and actual furnace output, and the theoretical and actual fuel ratio, the calculation parameters are corrected according to the calculation methods in steps B to D, and then smelting continues.

[0049] This invention, based on the principle of "quantitative and modular coal adjustment for precise control of blast furnace w([Si])", verifies the influencing factors of material rate (corrected air volume, corrected oxygen enrichment rate, coal ratio, coke batch, etc.) and their theoretical quantitative calculations to precisely control the material rate, verify the material rate control to meet standards, and calculate the theoretical iron content and theoretical indicators. Furthermore, it defines the range of w([Si]) after coal quantity adjustment (direct input of adjustment amount) – w([Si]) control (specified w([Si]), actual w([Si])). The theoretical pre-control of w([Si]) is combined with the calculation of the basic w([Si]) quantity, the specified w([Si]) quantity, the actual w([Si]) deviation, the w([Si]) quantity that needs to be adjusted, the hourly coal adjustment quantity (input), the calculation of the impact of coal quantity adjustment on the material rate, w([Si]) quantity and basicity, the verification of the pre-controlled iron w([Si]) quantity to meet the standard, the precise control of material rate before and after adjustment (oxygen enrichment, hourly pulverized coal quantity), the pre-control of iron w([Si]) value and slag iron composition, the adjustment and balancing of furnace smelting parameters, the re-verification of index composition, and the return of actual smelting results for correction.

[0050] In this invention, the raw materials used can include 1-2 types of high-silica acid pellets, 2 types of vanadium-titanium pellets, and 2 types of dry coke. When the overall grade of the feed material, clinker rate, coke ash content, and pulverized coal ash content change, the proportions, coke batches, hourly pulverized coal injection rate, and indirect smelting parameters are checked based on the assumption that w([Si]) remains constant and the slag basicity is within a certain range. The check includes a check of the theoretical temperature; the air volume is at full capacity, the air temperature is at its highest stable temperature without adjustment, and the oxygen enrichment rate after air volume correction is 2.90-5.00%.

[0051] When changes in the overall grade of the furnace feed, clinker rate, coke ash content, and pulverized coal ash content exceed the fluctuation range (see below), the proportions, coke batches, hourly pulverized coal injection rate, and theoretical indicators must be checked based on the baseline w([Si]) remaining unchanged and the slag basicity being within the range.

[0052] This invention, under the condition of the main reference parameters of the benchmark raw materials (clinker rate, overall feed grade, coke and pulverized coal ash content), combined with the benchmark operating parameters (benchmark coal quantity, benchmark feed rate, benchmark w([Si]))), performs the following: If the benchmark operating parameters such as total air pressure, air volume, air temperature, and w([Si]) are not adjusted, and the main raw material parameters are stable (the fluctuation ranges all meet the following conditions: clinker rate < ±1.0%, overall feed grade < ±0.20%, coke < ±0.1%, and pulverized coal ash content < ±0.10%), then it directly proceeds to the benchmark index determination step.

[0053] Based on the reduction rates of elements such as [Si], [Ti], [Mn], and [V] in molten iron under a predetermined w([Si]) value (obtained by fitting the (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, and w([Si])-V reduction rate) under similar raw material and fuel conditions (ore and coke varieties), the following formulas are used: w([Si])-desulfurization rate fitting relationship, and [S] removal rate fitting polynomial relationship with predetermined w([Si]) → amount of corresponding element oxides and S, P, and As entering the molten iron → amount of element oxides and S, P, and As entering the slag → output slag quantity (slag ratio), alkali metals, lead, zinc, titanium, sulfur load, etc. → theoretical slag composition (including basicity, magnesium-aluminum ratio, etc.). →Theoretical pig iron composition (derived from theoretical calculations of the corresponding element oxides entering the molten iron). The calculation formulas involving the aforementioned concepts are standard formulas (Zhou Chuandian, Blast Furnace Ironmaking Process Production Technology Handbook [M], Beijing: Beijing Metallurgical Industry Press, 2008); the calculation formulas involving slag ratio, corrected blast volume, and the calculation formulas for w([Si]), w([S]), w([P]), w(Ti]), w([As]), w([V]), and w(Mn) in molten iron, and the calculation formulas for w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), and w(MnO) in slag are publicly available information. The calculation also involves the fitting relationship between surface blast volume and corrected blast volume (or the correction multiple of surface blast volume and corrected blast volume).

[0054] When the main reference parameters of the benchmark raw materials (clinker rate, overall grade of feed into the furnace, coke ash content, and pulverized coal ash content) change beyond the stable range, the benchmark operating parameters are adjusted according to the magnitude of the change through step B2 (including the determination of the benchmark hourly coal quantity and coke batch after the change of raw materials).

[0055] The main verification conditions for batch calculation, parameter and index verification analysis are as follows: After the factor changes, the calculation order is: determination of hourly coal quantity → theoretical iron content of batch → calculation of theoretical coal ratio → determination of coke ratio and coke-to-coke ratio → determination of new coke batch → calculation of theoretical fuel ratio, utilization coefficient, smelting cycle and pulverized coal injection rate of batch under the change of basic conditions.

[0056] The concepts and calculation formulas involved are as follows:

[0057] Hourly coal quantity after factor changes: l2 = l1 - (m h1 -m h2 )*0.015*l1

[0058] l2 represents the hourly coal quantity after the factor change, in kg / t; l1 represents the hourly coal quantity before the factor change, in kg / t; m h1 The ash content of pulverized coal before changes in factors is expressed in kg / t; m h2 The ash content of pulverized coal after changes in factors is expressed in kg / t.

[0059] Coumarin ratio after factor changes

[0060] d2=(ΣTFe1-ΣTFe2)*0.02*d1-(S1-S2) / 5*1*d1 / 100-(w([Si])1-w([Si])2)*0.01*d1-(J h1 -J h2 )*0.015*d1+d1

[0061] d2 is the theoretical coke-to-butadiene ratio after factor changes, kg / t; d1 is the coke-to-butadiene ratio before factor changes, kg / t; ΣTFe1 is the overall feed grade before factor changes, kg / t; ΣTFe2 is the overall feed grade after factor changes, %; S1 is the clinker yield before factor changes, %; S2 is the clinker yield after factor changes, %; J h1 The coke ash content before changes in factors, %; J h2 The percentage of coke ash after changes in factors.

[0062] Focal ratio after factor changes

[0063] k2=(ΣTFe1-ΣTFe2)*0.02*k1-(S1-S2) / 5*1*d1 / 100-(w([Si])1-w([Si])2)*0.01*d1-(J1-J2)*0.015*k1+k1

[0064] k2 is the theoretical coke ratio after the factor change, kg / t; k1 is the coke ratio before the factor change, kg / t; ΣTFe1 is the overall grade of the furnace feed before the factor change, kg / t; ΣTFe2 is the overall grade of the furnace feed after the factor change, %; S1 is the clinker yield before the factor change, %; S2 is the clinker yield after the factor change, %; J1 is the coke ash content before the factor change, %; J2 is the coke ash content after the factor change, %.

[0065] After the factors change, the burnt batch C2 = (k2 + d2) * t 理 / 1000-J d

[0066] C2 represents the newly determined coke batch size after the change in factors, in kg / t; J d The weight of dry coke (unchanged) is kg / t.

[0067] The formulas for calculating the theoretical fuel ratio, utilization coefficient, smelting cycle, and pulverized coal injection rate are conventional formulas.

[0068] All calculations are based on a dry basis. The baseline w([Si]) remains unchanged, and the coking batch and hourly coal quantity (with coking coal content unchanged) are automatically calculated and adjusted according to the formula based on the raw material and fuel variables.

[0069] Then, calculate the slag ratio, various loads, theoretical pig iron composition, theoretical slag composition and basicity, magnesium-aluminum ratio, etc., in the same way as step (2) of step B1.

[0070] During the smelting process, the baseline w([Si]) often changes. The control is carried out in step C in combination with "coal regulation w([Si])".

[0071] C. Inputting the precise control of the pulverized coal injection adjustment amount w([Si]) and slag-iron composition.

[0072] During the blast furnace smelting process, the hourly pulverized coal injection rate is adjusted to precisely control the w([Si]) in order to achieve the specified w([Si]) in the smelting process, and the actual w([Si]) achieved after the adjustment reaction is verified and analyzed.

[0073] During blast furnace smelting, when the difference between the actual material rate and the specified benchmark material rate is within a certain range, the pre-control deviation of the specified w([Si]) and the actual w([Si]) is first checked. The definition of the adjustment amount of pulverized coal injection is: if the absolute value of the specified w([Si]) and the actual w([Si]) of a single furnace iron production is less than 0.05 percentage points, the check result is that no adjustment of the pulverized coal injection amount is required, and proceed to step D1; if the check result is that the absolute value of the specified w([Si]) and the actual w([Si]) is ≥ 0.05 percentage points, then the hourly pulverized coal injection amount pre-control w([Si]) needs to be adjusted, and proceed to step D2.

[0074] C1. The difference between the specified material speed and the actual material speed is within the specified range.

[0075] The material rate difference is defined by combining the theoretical material rate and the specified material rate. If the material rate difference is within the range (±1.0 batches / h), and |specified w([Si]) - actual w([Si])| < 0.05% percentage points (air volume is full air, constant air temperature, and oxygen enrichment is the current amount), it is determined that: the amount of pulverized coal injected does not need to be adjusted, and the cycle can proceed directly to the next cycle.

[0076] C2. Input the precise control of the pulverized coal injection adjustment amount w([Si]).

[0077] During the smelting process (with full blast volume, constant blast temperature, and current oxygen enrichment), if the absolute value of w([Si]) and actual w([Si]) in a single furnace iron production rate is ≥0.05 percentage points, "precise control of w([Si]) by adjusting the hourly coal quantity" is required. The required parameters, methods, and steps are as follows:

[0078] (1) Parameters to be collected (including calculated indirect smelting parameters and fuel parameters). Directly collected comprehensive air supply parameters include: surface air volume, humidity, air pressure, top pressure, air temperature, tuyer area, etc.; indirect smelting parameters (automatically calculated) include corrected air volume obtained based on the table-actual air volume correction coefficient (or fitting polynomial), as well as the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast kinetic energy and verification after correcting the air volume, etc. Fuel parameters to be collected include: batch weight, composition, and combustion rate before tuyer; hourly coal powder quantity, coal powder composition, and combustion rate before tuyer. In addition, the real-time hourly coal quantity is automatically accumulated to the hour.

[0079] (2) Determination of the amount of pulverized coal injection and precise control of the amount of molten iron w([Si]).

[0080] The steps for determining the amount of pulverized coal injection adjustment (calculation order) are as follows: original amount of pulverized coal injection → amount of pulverized coal injection adjustment (input) → new hourly coal quantity → theoretical material rate (obtained by combining the comprehensive blower parameters and fuel parameters in step (1) to obtain the coal consumption volume per ton of coal, the hourly coal consumption volume, the coke consumption volume per ton of coal, and the remaining air volume after coal burning) → amount of w([Si]) affected by the amount of pulverized coal adjustment → expected amount of w([Si]) after adjusting the amount of pulverized coal → judgment of coal adjustment effect.

[0081] The control effect of w([Si]) after coal adjustment (reflected 3.5 hours after coal adjustment) is compared with that in Zhou Chuandian's Blast Furnace Ironmaking Process Production Technology Manual (M), Beijing: Beijing Metallurgical Industry Press, 2008: If the desired effect is not achieved, cause analysis and error analysis are performed. If the cause is resolved, the process proceeds to the next cycle; if the cause cannot be resolved, the process stops. If the w([Si]) control effect is achieved, the process proceeds to step D3. After step D3, the process proceeds to the next cycle.

[0082] If the w([Si]) control effect is achieved, proceed to step D3. After step D3, proceed to the next cycle.

[0083] The concepts and formulas involved in this step are:

[0084] The estimated impact of coal adjustment on the amount of molten iron w([Si]) is: w([Si]) 影响量 =(M 调 / L 实时 / (Fe pl / 1000) / (J 批 / Fe pl +J d批 / Fe pl +M

[0085] 基 ))*100 / 10

[0086] w([Si]) 影响量 The influence of the theoretical calculation on the adjustment of pulverized coal injection rate on the amount of molten iron w([Si]), %; M 调 The adjustment rate for pulverized coal injection is kg / h; L 实时 The real-time theoretical material rate, calculated based on parameters such as the real-time corrected air volume and the oxygen enrichment rate obtained from the real-time oxygen enrichment after correcting the air volume, is expressed in batches per hour (Fe). pl The theoretical iron yield per batch of ore, kg / t; J 批 The dry weight of each batch of coke is kg / batch; J d批 The dry weight of each batch of tartaric acid is kg / batch, % M 基 This is the baseline coal ratio, kg / t. Note: M 调 The input value can be any multiple of 100. See below for specific requirements.

[0087] in:

[0088] Real-time theoretical material rate L 实时 =(V 校 *60-V mh )*f 风 / V C / (J 批 +J d批 )*1000

[0089] L 实时 The theoretical material velocity, calculated based on real-time oxygen enrichment and corrected surface air volume, is expressed as batch / h; V 校 The corrected air volume (m) is used to measure the air volume value. 3 / min;V mh The hourly coal consumption air volume, calculated to correct air volume and oxygen enrichment rate in real time, is measured in m. 3 / h;f 风 For the specific blast furnace air utilization rate, %; V C To correct for the air volume, the air consumption per ton of coke is calculated using the oxygen enrichment rate obtained from the real-time oxygen enrichment rate, m 3 / t;J 批 The dry weight of each batch of coke is kg / batch; J d批 The dry weight of each batch of charcoal is expressed in kg / batch, %.

[0090] Corrected air volume V 校 =((J) 实 *1000*J C实 / 100*φ C / 100+Jd实 *1000*J dC实 / 100*Φ JDC )+(M 实 *1000*M C实

[0091] / 100*Φ MC ))*0.9333 / (0.21+0.29*f h2O / 8 / 100+0.79*f O2 / 100) / 24 / 60

[0092] V 校 The corrected air volume (m) is used to measure the air volume value. 3 / min; J 实 The daily dry basis consumption of coke used in the current period, in tons (t); J C实 The carbon content (%) of the coke used in the current period; Φ C The combustion rate of coke before the tuyeres, %; J d实 The daily dry basis consumption of coking coal used in the current period, in tons (t); J dC实 The carbon content of the coking coal used in the current period, in %; Φ JDC The combustion rate of coke before the vent, %; M 实 The daily dry basis consumption of pulverized coal used in the current period, in tons (t); M C实 The carbon content (%) of the pulverized coal used in the current period; Φ MC The combustion rate of pulverized coal before the tuyeres, expressed as %; f h2O Atmospheric humidity, g / m 3 ;f O2 Oxygen enrichment rate, expressed as a percentage, calculated based on surface air volume. Note: Coke quantity (daily consumption) is based on actual values ​​from a past period (within the past two months) under similar raw material conditions. Oxygen enrichment rate F after adjusting for air volume. O2 =0.785*V O2 / 60 / (V 校 +V O2 / 60)*100

[0093] F O2 The oxygen enrichment rate (%) was calculated after correcting the surface air volume value; V O2 The current oxygen enrichment level, m 3 / h. The rest is the same as above. Air consumption per ton of coal V after correction. m =1000*M C实 / 100 / 24*22.4 / (0.21+0.29*f h2O / 100+0.79*F O2 / 100)*Φ MC V m To correct the air volume, the air consumption per ton of coal is calculated in m.3 / t; the rest are the same as above;

[0094] Hourly coal consumption and air volume V after adjusting for oxygen enrichment rate mh =V m *m h / 1000

[0095] V mh To correct for the hourly coal consumption air volume after adjusting for oxygen enrichment rate, m 3 / h;m h The amount is the hourly coal quantity, kg / t; the rest is the same as above.

[0096] Air consumption per ton of coke after correction V C =1000*J C实 / 100 / 24*22.4 / (0.21+0.29*f h2O / 100+0.79*F O2 / 100)*Φ C

[0097] V C To correct the air volume, the air consumption per ton of coke is calculated in m. 3 / t; the rest is the same as above.

[0098] Similarly, the theoretical combustion temperature, blower kinetic energy, and permeability index are obtained after correcting the air volume and oxygen enrichment rate (using the corrected air volume into the conventional calculation formula).

[0099] Theoretical iron content Fe pl For standard calculations, M 基 t represents the selected benchmark coal ratio.

[0100] The estimated amount of coal to be adjusted and the estimated amount of molten iron w([Si]) to be reached are w([Si]). 预计 =w([Si]) 实际 +w([Si]) 影响量

[0101] w([Si]) 预计 The expected amount of molten iron w([Si]) after adjustment by pulverized coal injection, in %; w([Si]) 实际 To adjust the amount of pulverized coal injected and the actual amount of molten iron (w([Si])) exiting the furnace after the reaction, %; w([Si]) 影响量 The amount of molten iron w([Si]) affected by the theoretical calculation of the amount of pulverized coal injection adjustment is %, and its sign is determined by the increase or decrease of the amount of pulverized coal injection (increase of pulverized coal injection is "+", decrease of pulverized coal injection is "-").

[0102] The methods and standards for adjusting the amount of pulverized coal injection are defined.

[0103] Furthermore, regarding the iron output w([Si])实际 The values ​​are determined and verified (based on routine sampling and analysis of iron tapping in normal furnace cycles, the time of the adjustment amount reaction result falls within the iron tapping time (based on the input iron tapping time, the computer is set to automatically find the iron tapping cycle). It is defined as follows: the reaction time of coke batch weight adjustment effect is one smelting cycle (calculated as a routine calculation); the reaction time of pulverized coal injection adjustment effect is 3.5h; the reaction time of oxygen enrichment adjustment effect is 1.0h (Zhou Chuandian, Blast Furnace Ironmaking Process Production Technology Manual [M], Beijing: Beijing Metallurgical Industry Press, 2008), calculated based on relevant data collected every hour (cumulative amount of data per minute). The hourly pulverized coal injection amount will not be adjusted again before the pulverized coal adjustment amount reacts.

[0104] Furthermore, once the hourly coal quantity adjustment meets the requirements, and the theoretical fuel ratio obtained after coal adjustment is compared with the planned fuel ratio, the error is checked and the process proceeds to the next cycle if it falls within the acceptable range.

[0105] Specifically, when the furnace is running smoothly and the difference (absolute value) between the theoretical material rate and the actual material rate is greater than 1.0 batches / h (more or less), the amount of pulverized coal injection is adjusted based on maintaining the theoretical coal ratio (the calculation formula is shown below). At this time, the amount of pulverized coal adjustment can exceed 5.0% of the original total coal amount. The calculation method for w([Si]) is similar.

[0106] C3. Verification of the effect of slag and iron composition prediction and control and coal adjustment quantity precise control w([Si]) after adjusting the precise control of pulverized coal injection w([Si]).

[0107] (1) Use the obtained pre-controlled w([Si]) value to obtain the slag iron composition and verify it.

[0108] Based on the above, the expected w([Si]) after the input hourly coal powder quantity reaches the reaction cycle is calculated. 预计 The values ​​are introduced into the fitting relationship (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, w([Si])-V reduction rate, w([Si])-desulfurization rate) obtained in the aforementioned (fitting relationship obtained by step B) to obtain the theoretical calculated values ​​of w([Si]), w([S]), w([P]), w(Ti]), w([As]), w([V]), w(Mn) in the molten iron of this batch; further, the theoretical calculated values ​​of w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), w(MnO) in the slag of this batch are obtained (step (1) in B1).

[0109] Furthermore, the composition of the obtained slag and iron was checked: the pre-controlled w([Si]) was... 预计The values ​​and other pig iron components such as w([S]), w([P]), w(Ti]), w([As]), w([V]), and w(Mn) were compared and verified with conventional sampling and analysis of iron samples taken within the corresponding time period (after the coal adjustment reaction cycle); the pre-controlled w([Si]) was also compared and verified. 预计 Under the given conditions, the slag components w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), and w(MnO) in other slags were compared and verified with the slag samples taken from the corresponding time period (after the coking and coal adjustment reaction cycle) using conventional sampling and analysis methods (which means comparing the predicted chemical components with the chemical components obtained from the sampling and testing).

[0110] (1) Verification of daily w([Si]) and daily theoretical indicators

[0111] The daily average w([Si]) value, daily theoretical coal ratio, coke ratio, and daily actual coal ratio and coke ratio are compared and verified with the daily theoretical output calculated based on the theoretical feed rate. The concepts, calculation methods, and formulas for the theoretical output and theoretical indicators involved are as follows:

[0112] Theoretical output (calculated based on tapping time and interval) t 出铁理 =Σ(ROUND((time) 本炉终了 -time 上炉终了 )*24,3)*L 实时 *O 料批 / 1000*ΣTFe / 100*0.99 / 0.94)

[0113] t 出铁理 The cumulative theoretical iron production (t / d) calculated based on the end-of-tapping interval of each furnace within a natural day; time 本炉终了 h represents the calendar time at which this furnace operation ends, where h is the minimum time (min) and time is the minimum time (time). 上炉终了 The calendar operation time at the end of the previous furnace run, h:min; L 实时 The theoretical material velocity, calculated based on real-time oxygen enrichment and corrected air volume, is expressed in batches per hour. 料批 ΣTFe represents the batch weight of ore, kg / h; ΣTFe represents the overall grade of the furnace feed, %.

[0114] Theoretical output (theoretical iron output based on hourly feed rate) t 下料理 =AVERAGE(L 实时 *24*O 料批 / 1000*ΣTFe / 100*0.99 / 0.94)

[0115] t 出铁理The daily output is the average value (t / d) obtained from the hourly theoretical iron output based on the hourly corrected air volume and oxygen enrichment rate; the rest is the same as above. The daily theoretical iron output is obtained by accumulating the hourly output to the daily output.

[0116] Theoretical fuel ratio (based on theoretical iron output per hour) calculated K 下料理 =C 干焦批 *L 实时 *24 / t 下料理 +M 小时喷煤 *24 / t 下料理

[0117] K 下料理 The hourly theoretical fuel ratio, measured in kg / t, is derived from the hourly theoretical iron content obtained by correcting the hourly air volume and oxygen enrichment rate. 小时喷煤 The value is the real-time hourly pulverized coal injection rate, in kg / h; the rest is the same as above.

[0118] The results of the operation show that the theoretical fuel ratio fluctuates within ±5 kg / t.

[0119] D. Following the previous steps (preliminary verification of blast furnace condition, coke batch adjustment (including coke briquettes), oxygen adjustment and material control, coal adjustment and temperature control), the raw materials and smelting parameters are adjusted before being fed into the furnace. Smelting parameters are adjusted accordingly: precise control of material rate, accurate control of w([Si]) (w([Si]) value of molten iron), slag and iron composition control calculation, and real-time theoretical prediction and pre-control of indicators. If the process conditions for each step are met and within the error range, the materials are fed into the furnace for smelting according to the material sequence. During the process, adjustments are made based on the changes in the main parameters of the raw materials and fuel conditions, the adjustment of smelting parameters, and the adjustment of the time of action, involving key operational parameters such as coke (including coke briquettes) batch weight, oxygen enrichment, and hourly coal quantity. The system also includes real-time theoretical material rate calculation, prediction and pre-control of molten iron w([Si]) and slag and iron composition, output, and indicators, as well as comparison and verification with actual smelting output, slag and iron composition, coking coal ratio, and iron content, and a return calculation template for further correction.

[0120] Furnace smelting and parameter control steps:

[0121] D1. The total amount of the four types of ore mentioned in A (including vanadium-titanium ore and common ore), along with coke with higher ash and sulfur content (including coke briquettes), is 100% fed into the blast furnace in the usual amount. After verifying the blast furnace condition, under constant blast temperature and full blast conditions, the "quantitative coal adjustment for precise control of molten iron w([Si]) value" is adopted. The number of times the hourly pulverized coal amount is adjusted is ≤3 times per shift to achieve the theoretical control of molten iron w([Si]) per day. 预计值 -Daily regulations w([Si]) 计划值 |<0.05 percentage points / day.

[0122] D2. Smelting shall be carried out under the following conditions:

[0123] This equipment is suitable for blast furnace smelting of titanium slag from vanadium-titanium ore and ordinary ore. The smelting parameters are as follows: hot blast pressure 0.30–0.39 MPa, top pressure 0.155–0.195 MPa, hot blast temperature 1150℃–1250℃, and furnace feed air volume (corrected) 3200–5700 m³ / h. 3 / min, oxygen enrichment of 9400~15000m 3 / h, pulverized coal injection rate is 135-165 kg / t iron (pulverized coal injection rate 22.0-35.0%); ore batch 33.0-55.0 tons, coke batch (dry basis) 7.2-11.0 tons; coke batch (dry basis) 0.45-0.70 tons; w([Si]) 0.055-0.35% (lower limit for vanadium-titanium ore smelting), slag basicity 1.10-1.18, molten iron temperature 1380-1480℃.

[0124] Coke batch adjustment: When the input (collection) raw material conditions (4 main components) reach the required adjustment range (definition requirements are defined in step A), calculations are performed according to the aforementioned rules, formulas, and methods (easy to automate). The effect of this adjustment is reflected within one smelting cycle.

[0125] The adjustment amount of hourly pulverized coal injection (controlling the molten iron w([Si])) is as follows: When the difference between the actual molten iron w([Si]) value and the planned w([Si]) value reaches the required adjustment range (see step A for the definition requirements), the calculation is performed according to the aforementioned rules, formulas, and methods (easy to automate). The adjustment amount of hourly pulverized coal injection is less than 5.0% of the original total hourly pulverized coal injection, and the effect of this adjustment takes 3.5 hours to materialize.

[0126] The adjustment effect reflects the landing time, which is resolved by the automatic search function.

[0127] The completion times for the above-mentioned influencing factors are as follows: furnace feed grade, slag basicity, clinker rate, and top pressure are all within one smelting cycle (4.5–5.5 hours, automatically calculated); pulverized coal injection is 3.5 hours; and air volume, air temperature, and humidity are 1 hour. The adjustment point is determined by the time it takes for the corresponding influencing factor to change and for the adjustment factor to take effect, based on maintaining a relatively stable overall fuel ratio (absolute deviation < 5 kg / t).

[0128] D3. Smelting shall be carried out under the following conditions:

[0129] During the smelting process, the slag ratio is 380–480 kg / t, the magnesium-aluminum ratio in the slag is 0.65–0.95, the slag basicity is 1.10–1.18, the controlled blast temperature is stable (any value within the range of 1180℃–1250℃), the oxygen enrichment rate (after adjusting for blast volume) is 2.90–5.0%, and the permeability index is 18000–22000 m³ / s. 3 / (min.MPa), theoretical combustion temperature 2300~2400℃, actual blower speed 255~275m / s, actual blower kinetic energy (after air volume correction) 17000~22000kg.m / s, theoretical hourly material rate 8.5~10.0 batches.

[0130] When oxygen is used to regulate the feed and coal is used to regulate the temperature, in addition to the deviation values ​​obtained meeting the aforementioned requirements for feed rate and silicon deviation, direct smelting parameters such as air volume, air pressure, and top pressure, as well as indirect smelting parameters such as permeability index, theoretical combustion temperature, and blast kinetic energy obtained through automatic calculation, are all within this range. For vanadium-titanium ore smelting blast furnaces, the lower limit of w([Si]) value and the upper limit of w(MgO) / w(Al2O3) value are taken.

[0131] The actual smelting results are returned for correction. According to the conventional slag and iron tapping (the number of iron tapping times in blast furnace is 2 to 3 times / day more than that in ordinary ore smelting), the corrected calculation parameters are returned based on the hourly theoretical and actual material rate, theoretical calculation control and actual w([Si]) value, theoretical slag and iron composition and actual slag and iron composition, theoretical and actual furnace output (day), theoretical and actual fuel ratio, etc.

[0132] In this invention, the composition of ordinary ore furnace charge is: 53,000-55,000 kg / batch of ore, consisting of sintered ore, ordinary high-silica acidic oxidizing pellets, and low-silica lump ore; the composition of vanadium-titanium ore furnace charge is: 320,000-34,000 kg / batch of ore, consisting of sintered ore, high-vanadium-titanium pellets, and high-silica lump ore. Following the aforementioned benchmark verification of the furnace charge ratio, coke batch, hourly coal blending, smelting indicators, and indirect smelting parameters after changes in the overall charge grade, clinker rate, coke ash content, and pulverized coal ash content, the benchmark charge calculation, parameter and index verification analysis, and the calculation, parameter and index verification analysis for changes in the main verification conditions (clinker rate, overall charge grade, coke ash content, and pulverized coal ash content), oxygen adjustment to control the actual material rate, precise control of the pulverized coal injection amount w([Si]), and slag and iron composition and effect verification, following the previous steps (preliminary verification of blast furnace condition, coke batch adjustment (including coke briquettes)). The process of adjusting raw materials and smelting parameters (oxygen adjustment, feed control, coal adjustment, and temperature control) and returning the adjusted smelting parameters for correction and verification is implemented. A "quantitative and modular coal adjustment for precise control of blast furnace w([Si])" method, which facilitates automatic data acquisition and comprehensive calculation, precisely controls the blast furnace iron w([Si]) and slag-iron composition. In daily smelting operations, 0-3 hourly adjustments of pulverized coal injection can accurately and stably achieve: |specified w([Si]) - actual w([Si])| < 0.05 percentage points, eliminating the possibility of reverse operation. Furthermore, it features real-time prediction and daily-actual value comparison and verification functions for theoretical and actual output, theoretical and actual fuel ratios, and smelting parameter verification, all of which facilitate automatic data acquisition, calculation, and analysis.

[0133] In step A, when the changes in the overall grade of the furnace feed, clinker rate, coke ash content, and pulverized coal ash content exceed the fluctuation range (see below), the proportion, coke batch, hourly pulverized coal injection rate, and theoretical indicators must be checked based on the baseline w([Si]) remaining unchanged and the slag basicity being within the range.

[0134] In step B (B1), the main raw material parameters must meet the following fluctuation ranges: clinker rate < ±1.0%, overall furnace charge grade < ±0.20%, coke < ±0.1%, and pulverized coal ash content < ±0.10%. The slag and iron composition is output directly according to the calculation sequence in step B1. Specifically, based on the benchmark smelting parameters (w([Si]), air volume, air pressure, hourly coal quantity, hourly actual material rate, etc.), and according to the smelting type of ordinary ore or vanadium-titanium ore, the target is to maintain theoretical basicity fluctuation <0.01 (±), w(TiO2) <17.0%, w(Al2O3) <13.0%, and magnesium-aluminum ratio 0.65~0.95 (upper limit for vanadium-titanium ore smelting). (This target is automatically calculated after inputting the specific raw material composition and furnace charge ratio structure; the calculated result should meet the above requirements.) Based on the iron ore charge ratio (3 bins for sintered ore, 2 bins for vanadium-titanium pellets, and 1 bin for lump ore) within the specified range, theoretical calculations and verifications were performed on the charge grade, theoretical iron content, smelting cycle, slag content, fuel ratio, pulverized coal injection rate, and slag-iron composition. The slag-iron composition, slag ratio, and potassium, sodium, zinc, and titanium loads were output. Among them, the characteristics of titanium slag smelting in vanadium-titanium ore (w(TiO2) range 10.0%~17.0%) under similar raw material and fuel conditions (ore and coke varieties) are: Si reduction rate <3.0%, Ti reduction rate <5.5%; Mn reduction rate <55%, V reduction rate <70%, and deS removal rate >85%); for ordinary ore smelting, the characteristics are: Si reduction rate <5.0%, Ti reduction rate <20.0%; Mn reduction rate <80%, V reduction rate <80%, and deS removal rate >93.0%).

[0135] In step B (B2), if the main raw material parameters exceed the stable range, the baseline operating parameters need to be adjusted according to the magnitude of the change (including the determination of the baseline hourly coal quantity and coke batch after the change of raw materials). Based on the baseline ore batch, coke batch (dry basis), w([Si]) quantity, constant blast temperature, and slag basicity within the range, the indirect smelting parameters such as the proportion, coke batch, hourly pulverized coal injection rate, and smelting cycle are checked. The steps and calculation order are as follows: after the factor change, determine the hourly coal quantity → theoretical iron content of the batch → calculation of the theoretical coal ratio → determination of the coke ratio and coke-to-coke ratio → determination of the new coke batch → calculation of the theoretical fuel ratio, utilization coefficient, smelting cycle, and pulverized coal injection rate of the batch under the changed basic conditions. The calculation formulas for the hourly coal quantity, coke-to-coke ratio, coke ratio, and coke batch (with the coke-to-coke batch remaining unchanged) after the factor change are detailed above (the calculations for the theoretical fuel ratio, utilization coefficient, smelting cycle, and pulverized coal injection rate are conventional formulas). Then, proceed to step (2) of step B1 to calculate the slag ratio, various loads, slag and iron composition, etc. The principle is: the coke batch is only adjusted according to the changes in the overall furnace grade, clinker ratio, and coke pulverized coal ash content; the change in w([Si]) value does not adjust the coke batch, but is mainly controlled by coal adjustment. When the coal ratio is continuously lower than the specified value for 2 furnaces during the smelting process, the coke batch is adjusted after the difference between the original coal ratio (and the current coal ratio) is converted. In particular: when the changing factors improve (clinker rate, overall furnace grade increases, coke ash content and pulverized coal ash content decrease), the direction of the change trend obtained by input calculation is: maintain the smelting parameters such as total air volume, oxygen content, and constant air temperature, the hourly coal injection volume decreases, the coal ratio decreases; the coke batch increases, the coke ratio decreases. The smelting cycle is extended. When the changing factors worsen (clinker rate, overall furnace grade decreases, coke ash content and pulverized coal ash content increase), the change trend is the opposite.

[0136] The clinker rate, furnace grade, coke ash content, and pulverized coal ash content values, after maintaining the theoretical slag alkalinity range, can be collected online and automatically calculated (in real time and cumulatively). The material rate is calculated automatically based on the changes in ore batch, coke batch, and the analysis and quantity of each component, combined with smelting parameters such as air volume, oxygen content, and air temperature.

[0137] Step C involves the precise control of the pulverized coal injection adjustment amount w([Si]) and the slag-iron composition and its verification. During the blast furnace smelting process, the pre-control deviation between the specified w([Si]) and the actual w([Si]) is first checked as the basis for whether to adjust the pulverized coal injection amount. The definition of the pulverized coal injection adjustment amount is: if the absolute value of the difference between the specified w([Si]) and the actual w([Si]) is <0.05 percentage points for a single furnace iron blast, no adjustment of the pulverized coal injection amount is required; if the absolute value of the difference between the specified w([Si]) and the actual w([Si]) is ≥0.05 percentage points, then proceed to step C2. This includes: the parameters collected in step (1) (including the calculated indirect smelting parameters and fuel parameters) and the determination of the pulverized coal injection adjustment amount and the precise control of the molten iron w([Si]) amount in step (2). Step (2) The determination steps (calculation order) for the adjustment amount of pulverized coal injection are as follows: original pulverized coal injection amount → pulverized coal injection adjustment amount (input) → new hourly coal amount → theoretical material rate (obtained by combining the comprehensive blasting parameters and fuel parameters in step (1) to obtain the ton coal consumption air volume, hourly coal consumption air volume, ton coke consumption air volume, and remaining air volume after coal burning) → the influence of pulverized coal adjustment amount on w([Si]) → the expected w([Si]) amount after adjusting the pulverized coal amount → the judgment of coal adjustment effect. Among them, the definition standard for adjusting the hourly pulverized coal injection amount is: by arbitrarily inputting (an integer multiple of 100, the adjustment amount is not greater than 5.0% of the original hourly pulverized coal injection amount) hourly pulverized coal injection adjustment amount (kg / h) until the molten iron after reaction is obtained, the expected w([Si]) amount obtained is w([Si]). 预计 The results simultaneously meet the following criteria (judgment principles for coal adjustment effect): (1) The theoretically expected impact of coal adjustment on |w([Si])| < 0.050% (increase or decrease); (2) The expected value of coal adjustment after adjustment is w([Si]). 预计 -w([Si]) 规定 |<0.03%. Specifically, when the actual w([Si]) value exceeds (or falls below) the specified w([Si]) value by more than 0.10 percentage points under normal furnace conditions, the allowable coal adjustment amount is |expected w([Si]) value - actual w([Si]) value|<0.10%.

[0138] Compare the control effect of w([Si]) after coal adjustment (reflected 3.5 hours after coal adjustment) (Zhou Chuandian, Blast Furnace Ironmaking Process Production Technology Manual [M], Beijing: Beijing Metallurgical Industry Press, 2008): If the desired effect is not achieved, conduct cause analysis and error analysis. If the cause is resolved, proceed to the next cycle; if the cause cannot be resolved, the process stops. If the w([Si]) control effect is achieved, proceed to step C3. After step C3, proceed to the next cycle.

[0139] Iron production w([Si]) 实际The value verification principle (based on routine sampling and analysis of iron tapping in normal furnace cycles, the time of adjustment of the reaction result falls within the iron tapping time (based on the input iron tapping time, the computer is set to automatically find the iron tapping cycle). It is defined as follows: the reaction time of coke batch weight adjustment effect is one smelting cycle (calculated as a routine calculation); the reaction time of pulverized coal injection adjustment effect is 3.5h; the reaction time of oxygen enrichment adjustment effect is 1.0h). The reaction time of oxygen enrichment is 1 hour (Zhou Chuandian, Blast Furnace Ironmaking Process Production Technology Manual [M], Beijing: Beijing Metallurgical Industry Press, 2008)), calculated based on the relevant data collected every hour (cumulative amount of data per minute).

[0140] If the hourly coal quantity adjustment meets the requirements, and the difference between the theoretical fuel ratio obtained after coal adjustment and the planned fuel ratio is less than ±5.0 kg / t, proceed to the next cycle.

[0141] (In particular, when the furnace is running smoothly and the difference between the theoretical material rate and the actual material rate (absolute value) is greater than 1.0 batches / h (more or less), the amount of pulverized coal injection is adjusted based on maintaining the theoretical coal ratio (the calculation formula is shown below). At this time, the amount of pulverized coal adjustment can exceed 3.0% of the original total coal amount. The calculation method for w([Si]) is the same.

[0142] Step C involves the following concepts and formulas: the expected impact of coal adjustment on molten iron w([Si]) w([Si]). 影响量 Real-time theoretical material velocity L 实时 Corrected air volume V 校 Oxygen enrichment rate F after correcting air volume O2 , Air consumption per ton of coal after correction V m , Air consumption per ton of coke after correction V C The estimated amount of coal to be adjusted and the estimated amount of molten iron w([Si]) to be reached are w([Si]). 预计 The calculation formulas are as follows (see above for details; the corrected air volume, theoretical combustion temperature after correcting oxygen enrichment, blower kinetic energy, and permeability index are all conventional formulas).

[0143] Step C (C2) involves predicting and controlling the slag and iron composition after adjusting the precise control of pulverized coal injection w ([Si]). Specifically, it involves predicting the w ([Si]) after the input hourly pulverized coal quantity reaches the reaction cycle. 预计 The value is introduced into the previously obtained fitting relationship between (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, w([Si])-V reduction rate, and w([Si])-desulfurization rate, thus obtaining w([Si]) 预计The slag and iron composition values ​​under the specified value; the verification of each component of slag and iron involved in step C (C3) (1) the effect of precise control of coal adjustment amount w([Si]); (2) the verification of w([Si]) and daily theoretical index. The definition standard is: the absolute value error rate of the difference between the daily theoretical coal ratio and coke ratio and the daily actual coal ratio and coke ratio is <1.50%, and the operation results reflect the fluctuation of theoretical fuel ratio within ±5kg / t during the operation. There is also a comparison of the actual daily iron production, that is, the comparison between the theoretical daily iron production and the actual daily iron production. The concepts and formulas involved include: theoretical output (theoretical calculation according to the iron production time and interval) t 出铁理 Theoretical output (calculated based on theoretical iron output per hour) t 下料理 Theoretical fuel ratio (based on theoretical iron output per hour) K calculated theoretically 下料理 .

[0144] Step D involves feeding the blast furnace with a total of 100% of the four types of ore mentioned in A (including vanadium-titanium ore and common ore), as well as coke with higher ash and sulfur content (including coke briquettes), in the usual amount. After verifying the blast furnace condition, under constant blast temperature, full blast temperature, and oxygen adjustment and material rate control, the "quantitative coal adjustment for precise control of molten iron w([Si]) value" is adopted. The number of times the hourly pulverized coal is adjusted in each shift is ≤3 times, thereby achieving the theoretical control of molten iron w([Si]) per day. 预计值 -Daily regulations w([Si]) 计划值 |<0.05 percentage points / day. Specifically: Coke batch adjustment: When the input (collection) of raw material conditions reaches the required adjustment range (definition requirements are defined in step A), calculations are performed according to the aforementioned rules, formulas, and methods (easy to automate). The effect of this adjustment is reflected within one smelting cycle.

[0145] The adjustment amount of hourly pulverized coal injection (controlling the molten iron w([Si])) is as follows: When the difference between the actual molten iron w([Si]) value and the planned w([Si]) value reaches the required adjustment range (see step A for the definition requirements), the calculation is performed according to the aforementioned rules, formulas, and methods (easy to automate). The adjustment amount of hourly pulverized coal injection is less than 5.0% of the original total, and the effect of this adjustment takes 3.5 hours to materialize.

[0146] The landing time reflected by the adjustment effect is automatically found by the reaction cycle based on the adjustment time and the specific adjustment factors.

[0147] During the smelting process, when oxygen controls the feed and coal controls the temperature, in addition to the deviation values ​​obtained meeting the aforementioned requirements for feed rate and silicon deviation, direct smelting parameters such as air volume, air pressure, and top pressure, as well as indirect smelting parameters such as permeability index, theoretical combustion temperature, and blast kinetic energy obtained through automatic calculation, are all within this range. For vanadium-titanium ore smelting blast furnaces, the lower limit of w([Si]) value and the upper limit of w(MgO) / w(Al2O3) value are taken.

[0148] Each step of this invention satisfies the smelting requirements of quantitative, modular, and precise control of w([Si]) (material rate) in the blast furnace smelting process. In steps D1 to D3 and E, blast furnace smelting is carried out by "precisely controlling w([Si]) value by inputting hourly coal quantity adjustment amount" under constant blast temperature, total blast volume, and oxygen-controlled material conditions. The smelting is completed by comparing and correcting the control parameters based on theoretical control and actual material rate, theoretical calculated control and actual w([Si]) value, theoretical slag and iron composition and actual slag and iron composition, theoretical and actual daily output, and theoretical and actual fuel ratio.

[0149] This invention is based on the fundamental principles of material and heat balance in a blast furnace. Under certain smelting intensity and technical specifications, during normal smelting (including ordinary ore and vanadium-titanium ore smelting), when the material rate and w([Si]) (molten iron w([Si]) value) deviate from the specified values, this invention, based on fundamental theory and the principle of "quantitative modular precise control of molten iron w([Si]) value through coal adjustment," forms a quantitative and modular processing mode that effectively solves the complex interrelationships between various direct and indirect smelting parameters during daily intensified smelting in a blast furnace. This mode addresses the control of coke batch, hourly coal quantity, hourly oxygen enrichment, material rate, molten iron w([Si]) value, and slag-iron composition (basicity, magnesium-aluminum ratio), as well as the prediction, control, and verification of smelting cycle and output, fuel ratio indicators, and the coordination and balance of various related data. It accurately ensures that the material rate and w([Si]) value during the smelting process reach the planned predetermined values ​​and has a continuous correction function.

[0150] This invention relates to a smelting method for quantitatively and modularly controlling the blast furnace temperature (molten iron w([Si]) value) during blast furnace smelting to improve blast furnace stability, reduce the molten iron w([Si]) value, enhance blast furnace production stability, and continuously improve stable technical and economic indicators. Specifically, it relates to a method for quantitatively and modularly controlling the interrelationship of blast furnace temperature (molten iron w([Si]) value) with the specified value during normal intensified smelting in a blast furnace. Based on blast furnace fundamental theory and the principle of "oxygen adjustment and material control + quantitative and modular precise control of molten iron w([Si]) value," this method addresses the interrelationship of related data such as coke batch, hourly coal quantity, hourly oxygen enrichment, material rate, molten iron w([Si]) value, slag-iron composition control (basicity, magnesium-aluminum ratio), smelting cycle and output, fuel ratio index prediction and control, verification, and coordination and balance of various direct (indirect) smelting parameters during daily intensified smelting in a blast furnace. Accurately ensure that the amount of w([Si]) in the smelting process reaches the planned value; more importantly, significantly increase the proportion of actual w([Si]) within the specified range (δ). w([Si])The method significantly reduces the value, improving not only the smooth operation of the blast furnace but also significantly reducing the fuel ratio and smelting costs. Furthermore, the implementation process can be automated based on data acquisition and calculation, featuring simplicity, rapid control, and accuracy. Simultaneously, this method is applicable to blast furnaces of any volume and with any charge structure (including vanadium-titanium ore smelting and conventional smelting), achieving the specified w([Si]) value in molten iron with only 0-3 tons of coal added per shift. It is an effective smelting method for improving the systematic and precise operation of blast furnaces, enhancing the stability of blast furnace conditions, and continuously improving technical indicators. It has broad applicability and adaptability.

[0151] This invention, based on fundamental metallurgical theory and combined with practical operational experience, systematically grasps the characteristics of raw materials and fuels, the production characteristics of blast furnace smelting, and the influence of various smelting parameters on the smelting process, as well as the matching and process control relationships of related smelting parameters. It develops a quantitative and modular processing technology method to address the interrelationships between various data points in the daily intensified smelting process of blast furnaces, including control of coke batch quantity, hourly coal quantity, hourly oxygen enrichment, material rate, molten iron w([Si]) value, and slag-iron composition (basicity, magnesium-aluminum ratio), smelting cycle and output, fuel ratio index prediction, control, verification, and coordination and balance of various direct (indirect) smelting parameters. During operation, quantitative and modular adjustments to oxygen enrichment and pulverized coal injection ensure that the material rate and w([Si]) value accurately reach the planned values ​​within the reaction cycle, significantly improving the stability of blast furnace production balance, improving the smoothness of blast furnace operation, and significantly reducing fuel ratio and smelting costs. Furthermore, the method should have broad applicability and adaptability. This has significant practical implications for production.

[0152] Compared with the prior art, the beneficial effects of this invention are as follows:

[0153] This invention digitizes, quantifies, and modularizes the complex and highly interconnected smelting operations involving furnace charge preparation and indicator prediction and verification, smelting parameter verification, oxygen adjustment and material control, precise control of coal adjustment (w([Si]) value of molten iron) (core module), shift (day) molten iron w([Si]) value (adjustment factors reflect furnace times, days), slag and iron composition pre-control and verification, and daily output and indicator tracking and pre-control and verification changes. It boasts the advantages of comprehensiveness, immediacy, systematicity, and accuracy. It achieves the specified molten iron w([Si]) value with 0-3 coal adjustments per shift, effectively improving the systematic and precise operation level of the blast furnace, enhancing blast furnace stability, and continuously improving technical indicators. Furthermore, this method is applicable to blast furnaces of any volume and with any charge structure (including vanadium-titanium ore smelting and general smelting). The application method is simple. The implementation process can automatically collect and calculate the required data (including the collection and correction of coke batch, hourly oxygen enrichment, hourly pulverized coal injection, and related direct smelting parameters), and adjust the time after the adjustment based on each factor, comparing and verifying the actual effect within the corresponding time. In practical applications, it is only necessary to input the adjustment amount (the adjustment amount of hourly pulverized coal injection) according to the method specified in this invention, and combine it with the obtained (collected) corresponding variables (raw material composition, furnace charge structure ratio, the effect of adjustment factors and reaction cycle, direct smelting parameters, etc.) to replace the cumbersome and error-prone solution of multiple simultaneous equations, directly output the desired effect, and realize real-time tracking and comparison verification of adjustment effect prediction. The calculation process also fully reflects the influence trend, magnitude, and control requirements of various factors in the smelting process on the blast furnace charge rate, w([Si]) (molten iron w([Si])) and slag-iron composition pre-control. This method aims to achieve quantitative and modular precise control of hourly material rate and blast furnace w([Si]) (molten iron w([Si]) value) during blast furnace smelting, thereby improving blast furnace stability and reducing blast furnace molten iron w([Si]) value while enhancing w([Si]) stability. It continuously improves the trend, suitability, and matching requirements of smelting parameters in terms of stable technical and economic indicators. Specifically, it addresses the issue of deviations in material rate and w([Si]) (molten iron w([Si]) value) from specified values ​​during normal intensified smelting processes. Based on blast furnace fundamental theory and the principle of "quantitative and modular precise control of molten iron w([Si]) value through coal adjustment," it provides a quantitative and modular processing mode to resolve the interrelationships between coke batch quantity, hourly coal quantity, hourly oxygen enrichment, material rate, molten iron w([Si]) value, slag-iron composition control (basicity, magnesium-aluminum ratio), smelting cycle and output, fuel ratio index prediction, control, verification, and coordination and balance of various direct (indirect) smelting parameters during daily intensified smelting. It also has a return correction function, and has the advantages of simple method and accurate control.

[0154] This invention is used in blast furnaces during normal intensified smelting (smelting of ordinary ore and vanadium-titanium ore) when the material rate and w([Si]) (the w([Si]) value of molten iron) deviate from the specified values ​​during the smelting process, or when it is necessary to further reduce w([Si]) fluctuations and precisely control the hourly material rate and blast furnace w([Si]) (the w([Si]) value of molten iron) to improve the stability of blast furnace conditions and reduce consumption; in particular, it should meet the need to continuously improve the operating level of blast furnace operators under different raw material and equipment conditions of different blast furnaces, and is used to replace the traditional method of relying on the experience of blast furnace operators or combining local simple calculations to obtain approximate adjustment amounts for operation. This method establishes a quantitative and modular adjustment method based on the principle of "quantitative, modular, and precise control of molten iron w([Si]) value through coal adjustment." This method dynamically and in real-time considers the influence of multiple related factors, overcoming the inconsistencies in calculations caused by differences in the abilities and skills of operators across three shifts. Furthermore, it utilizes computer technology to quantify, standardize, real-time, and comprehensively process the complex control process's related calculations. This ensures that the specified molten iron w([Si]) value can be achieved with only 0-3 coal adjustments per shift, effectively improving the systematic and precise operation level of the blast furnace, enhancing the stability of blast furnace conditions, and continuously improving technical indicators. Simultaneously, this method is applicable to blast furnaces of any volume and with any burden structure (including vanadium-titanium ore smelting and general smelting).

[0155] Compared with traditional approaches and models that rely on operational experience, on-site estimation, simplified local calculations, or calculations using a system of multivariate equations, and existing methods for material and temperature control, this invention systematically addresses the interrelationships of raw material and fuel composition characteristics, blast furnace smelting production characteristics, and the combined influence of various smelting parameters on the smelting process and results. It also addresses the matching and process control relationships of relevant smelting parameters. This invention develops a quantitative and modular processing technology to address the quantitative and modular adjustment of coke batches during daily intensified smelting in blast furnaces. This includes hourly coal quantity and hourly material rate control; hot metal w([Si]) value (specified w([Si]) value, expected w([Si]) value after coal adjustment, and actual w([Si]) value); slag and iron composition control (basicity, magnesium-aluminum ratio); smelting cycle and output (theoretical output based on theoretical material rate, theoretical output based on material rate during tapping time, and actual output); fuel ratio (theoretical and actual) index prediction, control, verification, and coordination and balance of various direct (indirect) smelting parameters. During operation, the amount of oxygen enrichment and pulverized coal injection are used for quantitative and modular adjustments to ensure that the amount of w([Si]) in the smelting process accurately reaches the planned value within the reaction cycle. It also has the function of comparing and verifying the adjustment effect (theoretical and calculated values ​​of material rate, w([Si]) value of molten iron and slag iron composition) and indicators such as output and fuel ratio by hour, furnace, and day, and returning the correction function. During operation, only the actual raw material composition and smelting parameters are needed to accurately determine the material rate, w([Si]) value, slag-iron composition, production-fuel ratio, and other indicators. This solves the problems of incomplete information, unsystematic consideration, and large errors in local calculations inherent in traditional methods. It also addresses the issue that operators often rely solely on personal skill and experience to make rough adjustments when adjusting the material rate, leading to inconsistent adjustment standards and calculation methods across shifts. Furthermore, it overcomes the shortcomings of traditional methods, such as insufficient consideration of variables and lack of real-time capability. It also addresses the problem that traditional methods cannot effectively control material rate and blast furnace w([Si]) by adjusting oxygen enrichment and pulverized coal injection, resulting in inaccurate calculations. Finally, it solves the problem of excessively long calculation times in traditional methods, addressing the issue of parameter adjustments (coke batch size, oxygen enrichment, ...) The previous method (coal injection rate) could not take into account the systemic problems of smelting. The new method combines actual changes to achieve real-time calculation, realizing comprehensive, systematic, dynamic and accurate joint calculation of complex control processes in complex blast furnace smelting. Operationally, it achieves quantification and standardization, and outputs results instantly. It solves the problem of the mutual influence of related data such as material rate, coal ratio, basicity, theoretical fuel ratio, coordination and balance of various smelting parameters, w([Si]) and slag-iron composition control, smelting cycle and index prediction control during daily blast furnace smelting. The specified w([Si]) value of molten iron can be achieved after 0 to 3 coal adjustments. More importantly, it ensures that w([Si]) is kept within the specified range for smelting, which not only improves the smoothness of furnace operation, but also significantly reduces fuel ratio and smelting cost.Furthermore, this method enables automatic data acquisition and calculation, real-time correlation of direct (indirect) smelting parameters, and is easy to automate, intelligentize, and visualize. It is not limited by the size of the blast furnace or the type of ore (smelting titanium slag from ordinary ore and vanadium-titanium ore). It is a new blast furnace smelting technology that can be widely applied. With just a simple input of the dosage (powdered pulverized coal quantity), it can automatically combine smelting parameters such as surface blast volume and oxygen enrichment to provide blast furnace operators with comprehensive and real-time operational support. It is characterized by its simplicity, rapid control, and accuracy. Attached Figure Description

[0156] Figure 1 This is the process for verifying the composition of raw materials, fuels, slag, and iron in the method of this invention;

[0157] Figure 2 This invention provides a process for precise control of molten iron w([Si]) and verification of slag and iron composition and theoretical indicators in the method of the present invention.

[0158] Figure 3 The fitting relationship between w([Si]) value and [Si] reduction rate;

[0159] Figure 4 The fitting relationship between w([Si]) value and [Ti] reduction rate;

[0160] Figure 5 The fitting relationship between w([Si]) value and [Mn] reduction rate;

[0161] Figure 6 The fitting relationship between w([Si]) value and [V] reduction rate;

[0162] Figure 7 The fitting relationship between w([Si]) value and desulfurization rate;

[0163] Figure 8 The fitting relationship between w([Si]) value and [Si] reduction rate;

[0164] Figure 9 The fitting relationship between w([Si]) value and [Ti] reduction rate;

[0165] Figure 10 The fitting relationship between w([Si]) value and [Mn] reduction rate;

[0166] Figure 11 The fitting relationship between w([Si]) value and [V] reduction rate;

[0167] Figure 12 The relationship between w([Si]) value and desulfurization rate is shown. Detailed Implementation

[0168] The present invention will now be described in further detail with reference to the embodiments.

[0169] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with the techniques or conditions described in the literature in the field or according to the product instructions. Materials or equipment whose manufacturers are not specified are all conventional products that can be obtained by purchase.

[0170] Example 1

[0171] A blast furnace smelting method for precise, modular, and quantitative control of coal temperature regulation w([Si]) includes the following steps:

[0172] A. Standard ingredients: The smelting process is ordinary ore smelting or medium titanium slag smelting.

[0173] When smelting ordinary ore, the ordinary ore furnace charge used includes the following components by mass percentage: 71% sinter, 20% high-silica pellets, and 9% low-silica lump ore; total 100%; ore batch 54,000 kg;

[0174] When smelting medium-titanium slag, the vanadium-titanium ore charge used includes the following components by mass percentage: 65% sintered ore, 30% vanadium-titanium pellets, and 5% low-silicon lump ore, totaling 100%; ore batches are 33,000 kg / batch.

[0175] In the smelting of ordinary ore or medium titanium slag, the coke batch is 10,000 kg / batch based on dry coke weight; the coke slag batch is 600 kg / batch based on dry coke weight; the pulverized coal injection rate is 21.5–48.5 t / h.

[0176] B. Ingredient calculation, parameter and index verification analysis:

[0177] B1. Benchmark ingredient calculation, parameter and index verification analysis:

[0178] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if the fluctuation range of factors in ordinary ore smelting or medium titanium slag smelting all meet the following conditions: clinker rate < ±1.0%, comprehensive furnace grade < ±0.20%, coke ash content < ±0.1%, and pulverized coal ash content < ±0.10%; then:

[0179] (1) Calculate the theoretical fuel ratio, utilization coefficient and smelting cycle;

[0180] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0181] (3) Calculate the conversion factor between the corrected air volume and the surface air volume. The oxygen enrichment rate after correcting the air volume is 2.90 to 5.00%.

[0182] B2. Verification and analysis of ingredient calculations, parameters, and indicators when key verification conditions change:

[0183] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if any one of the factors in the ordinary ore smelting or medium titanium slag smelting does not meet the following conditions: clinker rate < ±1.0%, overall furnace grade < ±0.20%, coke ash content < ±0.1%, pulverized coal ash content < ±0.10%; then:

[0184] (1) Calculate the hourly coal quantity, theoretical iron content of the batch, theoretical coal ratio, coke ratio, coke-butane ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting cycle and pulverized coal injection rate after the factors change;

[0185] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0186] C. Input the pulverized coal injection adjustment amount to precisely control w([Si]) and slag-iron composition:

[0187] The pre-control deviation of the specified w([Si]) and the actual w([Si]) is checked. If the absolute value of the difference between the specified w([Si]) and the actual w([Si]) for a single furnace iron production is less than 0.05 percentage points, the check result is that no adjustment is needed; otherwise, adjustment is needed.

[0188] The adjustment method is as follows:

[0189] (1) Collect comprehensive air supply parameters, indirect smelting parameters and fuel parameters;

[0190] (2) Based on the original amount of pulverized coal injection, input the pulverized coal injection adjustment amount to adjust the coal and obtain the new hourly coal quantity; then, through the collected comprehensive air supply parameters, indirect smelting parameters and fuel parameters, calculate the theoretical material rate, the amount of w([Si]) affected by the pulverized coal adjustment amount and the expected amount of w([Si]) after adjusting the pulverized coal quantity, and then judge the coal adjustment effect.

[0191] The judgment criteria are:

[0192] (1) After inputting the coal powder adjustment amount, the theoretically expected impact on the change in |w([Si]) is less than 0.050%;

[0193] (2)|w([Si]) 预计 -w([Si]) 规定 |<0.03%;

[0194] If conditions 1) to 2) are met simultaneously, and the difference between the actual material speed after coal adjustment and the specified benchmark material speed is checked, and the result is that no adjustment is needed, then the control effect of w([Si]) needs to be checked; at the same time, the theoretical combustion temperature, blast energy, permeability index and smelting cycle after coal adjustment are calculated.

[0195] If conditions 1) to 2) are met simultaneously, and the difference between the actual material speed after coal adjustment and the specified benchmark material speed is checked, and the result is that no adjustment is needed, then the control effect of w([Si]) needs to be checked; at the same time, the theoretical combustion temperature, blast energy, permeability index and smelting cycle after coal adjustment are calculated.

[0196] The specific method for verifying the control effect of w([Si]) is as follows:

[0197] The verification of w([Si]) and daily theoretical indicators is defined by the absolute error rate of the difference between the daily theoretical coal ratio and coke ratio and the daily actual coal ratio and coke ratio <1.50%; if both are met, the process continues.

[0198] D. Furnace smelting and parameter control:

[0199] During the smelting process, the number of times the hourly pulverized coal amount is adjusted in each shift is controlled to ≤3 times, and the daily theoretical control of molten iron w([Si]) is also controlled. 预计值 -Daily regulations w([Si]) 计划值 |<0.05 percentage points / day;

[0200] Smelting conditions: hot blast pressure 0.30~0.39MPa, top pressure 0.155~0.195MPa, hot blast temperature 1150℃~1250℃, and corrected furnace feed air volume 3200~5700m³. 3 / min, oxygen enrichment of 9400~15000m 3 / h, pulverized coal injection rate is 135-165 kg / t iron, pulverized coal injection rate is 22.0-35.0%; ore batch is 33.0-55.0 tons, coke batch is 7.2-11.0 tons on a dry basis; coke batch is 0.45-0.70 tons on a dry basis; w([Si]) is 0.055-0.35%, slag basicity is 1.10-1.18, and molten iron temperature is 1420-1480℃; during the smelting process, the slag ratio is 380-480 kg / t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag basicity is 1.10-1.18, the blast temperature is controlled to be stable, the oxygen enrichment rate is 2.90%-5.0%, and the permeability index is 18000-22000 m 3 / (min.MPa), theoretical combustion temperature 2300~2400℃, actual blowing speed 255~275m / s, actual blowing kinetic energy 17000~22000kg.m / S, theoretical hourly material rate 8.5~10.0 batches.

[0201] Example 2

[0202] A blast furnace smelting method for precise, modular, and quantitative control of coal temperature regulation w([Si]) includes the following steps:

[0203] A. Standard ingredients: The smelting process is ordinary ore smelting or medium titanium slag smelting.

[0204] When smelting ordinary ore, the ordinary ore furnace charge used includes the following components by mass percentage: 72% sinter, 28% high-silica pellets, and 0% low-silica lump ore; total 100%; ore batch 53,000 kg;

[0205] When smelting medium-titanium slag, the vanadium-titanium ore furnace charge used includes the following components by mass percentage: 62% sintered ore, 33% vanadium-titanium pellets, and 5% low-silicon lump ore, totaling 100%; ore batches are 320,000 kg / batch.

[0206] In the smelting of ordinary ore or medium titanium slag, the coke batch is 7200 kg / batch based on dry coke weight; the coke slag batch is 450 kg / batch based on dry coke weight; the pulverized coal injection rate is 21.5–48.5 t / h.

[0207] B. Ingredient calculation, parameter and index verification analysis:

[0208] B1. Benchmark ingredient calculation, parameter and index verification analysis:

[0209] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if the fluctuation range of factors in ordinary ore smelting or medium titanium slag smelting all meet the following conditions: clinker rate < ±1.0%, comprehensive furnace grade < ±0.20%, coke ash content < ±0.1%, and pulverized coal ash content < ±0.10%; then:

[0210] (1) Calculate the theoretical fuel ratio, utilization coefficient and smelting cycle;

[0211] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0212] (3) Calculate the conversion factor between the corrected air volume and the surface air volume. The oxygen enrichment rate after correcting the air volume is 2.90 to 5.00%.

[0213] B2. Verification and analysis of ingredient calculations, parameters, and indicators when key verification conditions change:

[0214] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if any one of the factors in the ordinary ore smelting or medium titanium slag smelting does not meet the following conditions: clinker rate < ±1.0%, overall furnace grade < ±0.20%, coke ash content < ±0.1%, pulverized coal ash content < ±0.10%; then:

[0215] (1) Calculate the hourly coal quantity, theoretical iron content of the batch, theoretical coal ratio, coke ratio, coke-butane ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting cycle and pulverized coal injection rate after the factors change;

[0216] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0217] C. Input the pulverized coal injection adjustment amount to precisely control w([Si]) and slag-iron composition:

[0218] The pre-control deviation of the specified w([Si]) and the actual w([Si]) is checked. If the absolute value of the difference between the specified w([Si]) and the actual w([Si]) for a single furnace iron production is less than 0.05 percentage points, the check result is that no adjustment is needed; otherwise, adjustment is needed.

[0219] The adjustment method is as follows:

[0220] (1) Collect comprehensive air supply parameters, indirect smelting parameters and fuel parameters;

[0221] (2) Based on the original amount of pulverized coal injection, input the pulverized coal injection adjustment amount to adjust the coal and obtain the new hourly coal quantity; then, through the collected comprehensive air supply parameters, indirect smelting parameters and fuel parameters, calculate the theoretical material rate, the amount of w([Si]) affected by the pulverized coal adjustment amount and the expected amount of w([Si]) after adjusting the pulverized coal quantity, and then judge the coal adjustment effect.

[0222] The judgment criteria are:

[0223] (1) After inputting the coal powder adjustment amount, the theoretically expected impact on the change in |w([Si]) is less than 0.050%;

[0224] (2)|w([Si]) 预计 -w([Si]) 规定 |<0.03%;

[0225] Specifically, when the actual w([Si]) value exceeds (or falls below) the specified w([Si]) value by more than 0.10% under normal furnace operation, the allowable coal adjustment amount is |expected w([Si]) value - actual w([Si]) value| < 0.10%;

[0226] If conditions 1) to 2) are met simultaneously, and the difference between the actual material speed after coal adjustment and the specified benchmark material speed is checked, and the result is that no adjustment is needed, then the control effect of w([Si]) needs to be checked; at the same time, the theoretical combustion temperature, blast energy, permeability index and smelting cycle after coal adjustment are calculated.

[0227] The specific method for verifying the control effect of w([Si]) is as follows:

[0228] The verification of w([Si]) and daily theoretical indicators is defined by the absolute error rate of the difference between the daily theoretical coal ratio and coke ratio and the daily actual coal ratio and coke ratio <1.50%; if both are met, the process continues.

[0229] D. Furnace smelting and parameter control:

[0230] During the smelting process, the number of times the hourly pulverized coal amount is adjusted in each shift is controlled to ≤3 times, and the daily theoretical control of molten iron w([Si]) is also controlled. 预计值 -Daily regulations w([Si]) 计划值 |<0.05 percentage points / day;

[0231] Smelting conditions: hot blast pressure 0.30~0.39MPa, top pressure 0.155~0.195MPa, hot blast temperature 1150℃~1250℃, and corrected furnace feed air volume 3200~5700m³. 3 / min, oxygen enrichment of 9400~15000m 3 / h, pulverized coal injection rate is 135-165 kg / t iron, pulverized coal injection rate is 22.0-35.0%; ore batch is 33.0-55.0 tons, coke batch is 7.2-11.0 tons on a dry basis; coke batch is 0.45-0.70 tons on a dry basis; w([Si]) is 0.055-0.35%, slag basicity is 1.10-1.18, and molten iron temperature is 1420-1480℃; during the smelting process, the slag ratio is 380-480 kg / t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag basicity is 1.10-1.18, the blast temperature is controlled to be stable, the oxygen enrichment rate is 2.90%-5.0%, and the permeability index is 18000-22000 m 3 / (min.MPa), theoretical combustion temperature 2300~2400℃, actual blowing speed 255~275m / s, actual blowing kinetic energy 17000~22000kg.m / S, theoretical hourly material rate 8.5~10.0 batches.

[0232] The sintered ore composition, by mass percentage, includes 52.0–54.0% TFe, 5.5–6.5% SiO2, 13.0–13.5% CaO, 1.75–2.19% Al2O3, 2.30–2.90% MgO, 0.40–1.35% TiO2, 0.045%–0.055% S, 0.165–0.150% V2O5, and 0.045%–0.055% MnO, with the balance being unavoidable impurities. The bulk density is 1.90–2.10 t / m³. 3 ;

[0233] The vanadium-titanium ore pellets, by mass percentage, comprise 53.5–57.5% TFe, 4.5–5.5% SiO2, 0.55–1.35% CaO, 2.20–2.90% Al2O3, 2.35–2.90% MgO, 6.40–11.0% TiO2, 0.55–0.75% V2O5, and 0.23%–0.25% MnO, with the balance being unavoidable impurities; the bulk density is 2.2–2.3 t / m³. 3 ;

[0234] The high-silica pellets contain, by mass percentage: 58.5–60.0% TFe, 6.5–7.5% SiO2, 0.5–1.5% CaO, 1.80–2.10% Al2O3, 1.0–1.5% MgO, 2.50–3.50% TiO2, 0.165–0.150% V2O5, and 0.045%–0.055% MnO, with the balance being unavoidable impurities. The bulk density is 2.15–2.35 t / m³. 3 ;

[0235] The low-silica lump ore composition, by mass percentage, includes 64.0–66.0% TFe, 3.0–4.5% SiO2, 0.03–0.05% CaO, 1.00–1.50% Al2O3, 0.01–1.0% MgO, TiO2 <1.0%, 0.030–0.050% V2O5, and 0.110%–0.160% MnO, with the balance being unavoidable impurities. The bulk density is 2.2–2.4 t / m³. 3 .

[0236] The coke composition, by mass percentage, includes 84.0–86.5% C and 13.5–14.5% ash, with a bulk density of 0.55–0.65 t / m³. 3 ;

[0237] The coke ash composition by mass percentage includes 53.0–56.0% SiO2, 2.20–3.0% CaO, 24.0–26.0% Al2O3, 0.15–1.0% MgO, TiO2 <2.0%, 0.35%–0.45% MnO, with the balance being unavoidable impurities.

[0238] The pulverized coal composition includes, by mass percentage, 76.0-78.0% C, 13.5-15.0% ash, and 12.5-13.5% volatile matter, with a particle size of -200 mesh accounting for 66-70%.

[0239] The ash composition of the pulverized coal, by mass percentage, includes 55.0–57.0% SiO2, 5.20–6.50% CaO, 23.0–25.0% Al2O3, 2.20–2.50% MgO, TiO2 <2.0%, and 0.35%–0.45% MnO, with the balance being unavoidable impurities.

[0240] The comprehensive air supply parameters include: surface air volume, humidity, air pressure, top pressure, air temperature, and tuyer area; indirect smelting parameters include corrected air volume and the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast energy after correcting the air volume; fuel parameters include the batch weight, composition, and combustion rate of coke and coke briquettes before the tuyer, as well as the hourly coal powder quantity, coal powder composition, and combustion rate before the tuyer.

[0241] The adjustment amount of hourly pulverized coal injection is less than 5.0% of the original total hourly pulverized coal injection.

[0242] It also includes step E, actual smelting result return correction: based on the actual smelting results obtained in step E, and based on the theoretical control and actual material rate, the theoretical calculation control and actual w([Si]) value, the theoretical slag and iron composition and the actual slag and iron composition, the theoretical and actual furnace output, and the theoretical and actual fuel ratio, the calculation parameters are corrected according to the calculation methods in steps B to D, and smelting continues.

[0243] Example 3

[0244] A blast furnace smelting method for precise, modular, and quantitative control of coal temperature regulation w([Si]) includes the following steps:

[0245] A. Standard ingredients: The smelting process is ordinary ore smelting or medium titanium slag smelting.

[0246] When smelting ordinary ore, the ordinary ore furnace charge used includes the following components by mass percentage: 65% sinter, 25% high-silica pellets, and 10% low-silica lump ore; total 100%; ore batch 55,000 kg;

[0247] When smelting medium-titanium slag, the vanadium-titanium ore charge used includes the following components by mass percentage: 65% sintered ore, 35% vanadium-titanium pellets, 0% low-silicon lump ore, totaling 100%; ore batch 34,000 kg / batch.

[0248] In the smelting of ordinary ore or medium titanium slag, the coke batch is 11,000 kg / batch based on dry coke weight; the coke slag batch is 700 kg / batch based on dry coke weight; the pulverized coal injection rate is 21.5–48.5 t / h.

[0249] B. Ingredient calculation, parameter and index verification analysis:

[0250] B1. Benchmark ingredient calculation, parameter and index verification analysis:

[0251] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if the fluctuation range of factors in ordinary ore smelting or medium titanium slag smelting all meet the following conditions: clinker rate < ±1.0%, comprehensive furnace grade < ±0.20%, coke ash content < ±0.1%, and pulverized coal ash content < ±0.10%; then:

[0252] (1) Calculate the theoretical fuel ratio, utilization coefficient and smelting cycle;

[0253] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0254] (3) Calculate the conversion factor between the corrected air volume and the surface air volume. The oxygen enrichment rate after correcting the air volume is 2.90 to 5.00%.

[0255] B2. Verification and analysis of ingredient calculations, parameters, and indicators when key verification conditions change:

[0256] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if any one of the factors in the ordinary ore smelting or medium titanium slag smelting does not meet the following conditions: clinker rate < ±1.0%, overall furnace grade < ±0.20%, coke ash content < ±0.1%, pulverized coal ash content < ±0.10%; then:

[0257] (1) Calculate the hourly coal quantity, theoretical iron content of the batch, theoretical coal ratio, coke ratio, coke-butane ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting cycle and pulverized coal injection rate after the factors change;

[0258] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0259] C. Input the pulverized coal injection adjustment amount to precisely control w([Si]) and slag-iron composition:

[0260] The pre-control deviation of the specified w([Si]) and the actual w([Si]) is checked. If the absolute value of the difference between the specified w([Si]) and the actual w([Si]) for a single furnace iron production is less than 0.05 percentage points, the check result is that no adjustment is needed; otherwise, adjustment is needed.

[0261] The adjustment method is as follows:

[0262] (1) Collect comprehensive air supply parameters, indirect smelting parameters and fuel parameters;

[0263] (2) Based on the original amount of pulverized coal injection, input the pulverized coal injection adjustment amount to adjust the coal and obtain the new hourly coal quantity; then, through the collected comprehensive air supply parameters, indirect smelting parameters and fuel parameters, calculate the theoretical material rate, the amount of w([Si]) affected by the pulverized coal adjustment amount and the expected amount of w([Si]) after adjusting the pulverized coal quantity, and then judge the coal adjustment effect.

[0264] The judgment criteria are:

[0265] (1) After inputting the coal powder adjustment amount, the theoretically expected impact on the change in |w([Si]) is less than 0.050%;

[0266] (2)|w([Si]) 预计 -w([Si]) 规定 |<0.03%;

[0267] Specifically, when the actual w([Si]) value exceeds (or falls below) the specified w([Si]) value by more than 0.10% under normal furnace operation, the allowable coal adjustment amount is |expected w([Si]) value - actual w([Si]) value| < 0.10%;

[0268] If conditions 1) to 2) are met simultaneously, and the difference between the actual material speed after coal adjustment and the specified benchmark material speed is checked, and the result is that no adjustment is needed, then the control effect of w([Si]) needs to be checked; at the same time, the theoretical combustion temperature, blast energy, permeability index and smelting cycle after coal adjustment are calculated.

[0269] The specific method for verifying the control effect of w([Si]) is as follows:

[0270] The verification of w([Si]) and daily theoretical indicators is defined by the absolute error rate of the difference between the daily theoretical coal ratio and coke ratio and the daily actual coal ratio and coke ratio <1.50%; if both are met, the process continues.

[0271] D. Furnace smelting and parameter control:

[0272] During the smelting process, the number of times the hourly pulverized coal amount is adjusted in each shift is controlled to ≤3 times, and the daily theoretical control of molten iron w([Si]) is also controlled. 预计值 -Daily regulations w([Si])计划值 |<0.05 percentage points / day;

[0273] Smelting conditions: hot blast pressure 0.30~0.39MPa, top pressure 0.155~0.195MPa, hot blast temperature 1150℃~1250℃, and corrected furnace feed air volume 3200~5700m³. 3 / min, oxygen enrichment of 9400~15000m 3 / h, pulverized coal injection rate is 135-165 kg / t iron, pulverized coal injection rate is 22.0-35.0%; ore batch is 33.0-55.0 tons, coke batch is 7.2-11.0 tons on a dry basis; coke batch is 0.45-0.70 tons on a dry basis; w([Si]) is 0.055-0.35%, slag basicity is 1.10-1.18, and molten iron temperature is 1420-1480℃; during the smelting process, the slag ratio is 380-480 kg / t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag basicity is 1.10-1.18, the blast temperature is controlled to be stable, the oxygen enrichment rate is 2.90%-5.0%, and the permeability index is 18000-22000 m 3 / (min.MPa), theoretical combustion temperature 2300~2400℃, actual blowing speed 255~275m / s, actual blowing kinetic energy 17000~22000kg.m / S, theoretical hourly material rate 8.5~10.0 batches.

[0274] The sintered ore composition, by mass percentage, includes 52.0–54.0% TFe, 5.5–6.5% SiO2, 13.0–13.5% CaO, 1.75–2.19% Al2O3, 2.30–2.90% MgO, 0.40–1.35% TiO2, 0.045%–0.055% S, 0.165–0.150% V2O5, and 0.045%–0.055% MnO, with the balance being unavoidable impurities. The bulk density is 1.90–2.10 t / m³. 3 ;

[0275] The vanadium-titanium ore pellets, by mass percentage, comprise 53.5–57.5% TFe, 4.5–5.5% SiO2, 0.55–1.35% CaO, 2.20–2.90% Al2O3, 2.35–2.90% MgO, 6.40–11.0% TiO2, 0.55–0.75% V2O5, and 0.23%–0.25% MnO, with the balance being unavoidable impurities; the bulk density is 2.2–2.3 t / m³. 3 ;

[0276] The high-silica pellets contain, by mass percentage: 58.5–60.0% TFe, 6.5–7.5% SiO2, 0.5–1.5% CaO, 1.80–2.10% Al2O3, 1.0–1.5% MgO, 2.50–3.50% TiO2, 0.165–0.150% V2O5, and 0.045%–0.055% MnO, with the balance being unavoidable impurities. The bulk density is 2.15–2.35 t / m³. 3 ;

[0277] The low-silica lump ore composition, by mass percentage, includes 64.0–66.0% TFe, 3.0–4.5% SiO2, 0.03–0.05% CaO, 1.00–1.50% Al2O3, 0.01–1.0% MgO, TiO2 <1.0%, 0.030–0.050% V2O5, and 0.110%–0.160% MnO, with the balance being unavoidable impurities. The bulk density is 2.2–2.4 t / m³. 3 .

[0278] The coke composition, by mass percentage, includes 84.0–86.5% C and 13.5–14.5% ash, with a bulk density of 0.55–0.65 t / m³. 3 ;

[0279] The coke ash composition by mass percentage includes 53.0–56.0% SiO2, 2.20–3.0% CaO, 24.0–26.0% Al2O3, 0.15–1.0% MgO, TiO2 <2.0%, 0.35%–0.45% MnO, with the balance being unavoidable impurities.

[0280] The pulverized coal composition includes, by mass percentage, 76.0-78.0% C, 13.5-15.0% ash, and 12.5-13.5% volatile matter, with a particle size of -200 mesh accounting for 66-70%.

[0281] The ash composition of the pulverized coal, by mass percentage, includes 55.0–57.0% SiO2, 5.20–6.50% CaO, 23.0–25.0% Al2O3, 2.20–2.50% MgO, TiO2 <2.0%, and 0.35%–0.45% MnO, with the balance being unavoidable impurities.

[0282] The comprehensive air supply parameters include: surface air volume, humidity, air pressure, top pressure, air temperature, and tuyer area; indirect smelting parameters include corrected air volume and the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast energy after correcting the air volume; fuel parameters include the batch weight, composition, and combustion rate of coke and coke briquettes before the tuyer, as well as the hourly coal powder quantity, coal powder composition, and combustion rate before the tuyer.

[0283] The adjustment amount of hourly pulverized coal injection is less than 5.0% of the original total hourly pulverized coal injection.

[0284] It also includes step E, actual smelting result return correction: based on the actual smelting results obtained in step E, and based on the theoretical control and actual material rate, the theoretical calculation control and actual w([Si]) value, the theoretical slag and iron composition and the actual slag and iron composition, the theoretical and actual furnace output, and the theoretical and actual fuel ratio, the calculation parameters are corrected according to the calculation methods in steps B to D, and smelting continues.

[0285] Example 4

[0286] A blast furnace smelting method for precise, modular, and quantitative control of coal temperature regulation w([Si]) includes the following steps:

[0287] A. Standard ingredients: The smelting process is ordinary ore smelting or medium titanium slag smelting.

[0288] When smelting ordinary ore, the ordinary ore furnace charge used includes the following components by mass percentage: 71% sinter, 20% high-silica pellets, and 9% low-silica lump ore; total 100%; ore batch 54,000 kg;

[0289] When smelting medium-titanium slag, the vanadium-titanium ore charge used includes the following components by mass percentage: 60% sinter, 35% vanadium-titanium pellets, and 0% low-silicon lump ore, totaling 100%; ore batches are 33,000 kg / batch.

[0290] In the smelting of ordinary ore or medium titanium slag, the coke batch is 10,000 kg / batch based on dry coke weight; the coke slag batch is 600 kg / batch based on dry coke weight; the pulverized coal injection rate is 21.5–48.5 t / h.

[0291] B. Ingredient calculation, parameter and index verification analysis:

[0292] B1. Benchmark ingredient calculation, parameter and index verification analysis:

[0293] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if the fluctuation range of factors in ordinary ore smelting or medium titanium slag smelting all meet the following conditions: clinker rate < ±1.0%, comprehensive furnace grade < ±0.20%, coke ash content < ±0.1%, and pulverized coal ash content < ±0.10%; then:

[0294] (1) Calculate the theoretical fuel ratio, utilization coefficient and smelting cycle;

[0295] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0296] (3) Calculate the conversion factor between the corrected air volume and the surface air volume. The oxygen enrichment rate after correcting the air volume is 2.90 to 5.00%.

[0297] B2. Verification and analysis of ingredient calculations, parameters, and indicators when key verification conditions change:

[0298] The wind pressure, air volume, wind temperature, and w([Si]) of the entire air supply remain unchanged, among which the wind temperature is the highest stable wind temperature; if any one of the factors in the ordinary ore smelting or medium titanium slag smelting does not meet the following conditions: clinker rate < ±1.0%, overall furnace grade < ±0.20%, coke ash content < ±0.1%, pulverized coal ash content < ±0.10%; then:

[0299] (1) Calculate the hourly coal quantity, theoretical iron content of the batch, theoretical coal ratio, coke ratio, coke-butane ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting cycle and pulverized coal injection rate after the factors change;

[0300] (2) Calculate the theoretical composition of pig iron, theoretical composition of slag, basicity, and magnesium-aluminum ratio;

[0301] C. Input the pulverized coal injection adjustment amount to precisely control w([Si]) and slag-iron composition:

[0302] The pre-control deviation of the specified w([Si]) and the actual w([Si]) is checked. If the absolute value of the difference between the specified w([Si]) and the actual w([Si]) for a single furnace iron production is less than 0.05 percentage points, the check result is that no adjustment is needed; otherwise, adjustment is needed.

[0303] The adjustment method is as follows:

[0304] (1) Collect comprehensive air supply parameters, indirect smelting parameters and fuel parameters;

[0305] (2) Based on the original amount of pulverized coal injection, input the pulverized coal injection adjustment amount to adjust the coal and obtain the new hourly coal quantity; then, through the collected comprehensive air supply parameters, indirect smelting parameters and fuel parameters, calculate the theoretical material rate, the amount of w([Si]) affected by the pulverized coal adjustment amount and the expected amount of w([Si]) after adjusting the pulverized coal quantity, and then judge the coal adjustment effect.

[0306] The judgment criteria are:

[0307] (1) After inputting the coal powder adjustment amount, the theoretically expected impact on the change in |w([Si]) is less than 0.050%;

[0308] (2)|w([Si]) 预计 -w([Si]) 规定 |<0.03%;

[0309] Specifically, when the actual w([Si]) value exceeds (or falls below) the specified w([Si]) value by more than 0.10% under normal furnace operation, the allowable coal adjustment amount is |expected w([Si]) value - actual w([Si]) value| < 0.10%;

[0310] If conditions 1) to 2) are met simultaneously, and the difference between the actual material speed after coal adjustment and the specified benchmark material speed is checked, and the result is that no adjustment is needed, then the control effect of w([Si]) needs to be checked; at the same time, the theoretical combustion temperature, blast energy, permeability index and smelting cycle after coal adjustment are calculated.

[0311] The specific method for verifying the control effect of w([Si]) is as follows:

[0312] The verification of w([Si]) and daily theoretical indicators is defined by the absolute error rate of the difference between the daily theoretical coal ratio and coke ratio and the daily actual coal ratio and coke ratio <1.50%; if both are met, the process continues.

[0313] D. Furnace smelting and parameter control:

[0314] During the smelting process, the number of times the hourly pulverized coal amount is adjusted in each shift is controlled to ≤3 times, and the daily theoretical control of molten iron w([Si]) is also controlled. 预计值 -Daily regulations w([Si]) 计划值 |<0.05 percentage points / day;

[0315] Smelting conditions: hot blast pressure 0.30~0.39MPa, top pressure 0.155~0.195MPa, hot blast temperature 1150℃~1250℃, and corrected furnace feed air volume 3200~5700m³. 3 / min, oxygen enrichment of 9400~15000m 3 / h, pulverized coal injection rate is 135-165 kg / t iron, pulverized coal injection rate is 22.0-35.0%; ore batch is 33.0-55.0 tons, coke batch is 7.2-11.0 tons on a dry basis; coke batch is 0.45-0.70 tons on a dry basis; w([Si]) is 0.055-0.35%, slag basicity is 1.10-1.18, and molten iron temperature is 1420-1480℃; during the smelting process, the slag ratio is 380-480 kg / t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag basicity is 1.10-1.18, the blast temperature is controlled to be stable, the oxygen enrichment rate is 2.90%-5.0%, and the permeability index is 18000-22000 m 3 / (min.MPa), theoretical combustion temperature 2300~2400℃, actual blowing speed 255~275m / s, actual blowing kinetic energy 17000~22000kg.m / S, theoretical hourly material rate 8.5~10.0 batches.

[0316] The sintered ore composition, by mass percentage, includes 52.0–54.0% TFe, 5.5–6.5% SiO2, 13.0–13.5% CaO, 1.75–2.19% Al2O3, 2.30–2.90% MgO, 0.40–1.35% TiO2, 0.045%–0.055% S, 0.165–0.150% V2O5, and 0.045%–0.055% MnO, with the balance being unavoidable impurities. The bulk density is 1.90–2.10 t / m³. 3 ;

[0317] The vanadium-titanium ore pellets, by mass percentage, comprise 53.5–57.5% TFe, 4.5–5.5% SiO2, 0.55–1.35% CaO, 2.20–2.90% Al2O3, 2.35–2.90% MgO, 6.40–11.0% TiO2, 0.55–0.75% V2O5, and 0.23%–0.25% MnO, with the balance being unavoidable impurities; the bulk density is 2.2–2.3 t / m³. 3 ;

[0318] The high-silica pellets contain, by mass percentage: 58.5–60.0% TFe, 6.5–7.5% SiO2, 0.5–1.5% CaO, 1.80–2.10% Al2O3, 1.0–1.5% MgO, 2.50–3.50% TiO2, 0.165–0.150% V2O5, and 0.045%–0.055% MnO, with the balance being unavoidable impurities. The bulk density is 2.15–2.35 t / m³. 3 ;

[0319] The low-silica lump ore composition, by mass percentage, includes 64.0–66.0% TFe, 3.0–4.5% SiO2, 0.03–0.05% CaO, 1.00–1.50% Al2O3, 0.01–1.0% MgO, TiO2 <1.0%, 0.030–0.050% V2O5, and 0.110%–0.160% MnO, with the balance being unavoidable impurities. The bulk density is 2.2–2.4 t / m³. 3 .

[0320] The coke composition, by mass percentage, includes 84.0–86.5% C and 13.5–14.5% ash, with a bulk density of 0.55–0.65 t / m³. 3 ;

[0321] The coke ash composition by mass percentage includes 53.0–56.0% SiO2, 2.20–3.0% CaO, 24.0–26.0% Al2O3, 0.15–1.0% MgO, TiO2 <2.0%, 0.35%–0.45% MnO, with the balance being unavoidable impurities.

[0322] The pulverized coal composition includes, by mass percentage, 76.0-78.0% C, 13.5-15.0% ash, and 12.5-13.5% volatile matter, with a particle size of -200 mesh accounting for 66-70%.

[0323] The ash composition of the pulverized coal, by mass percentage, includes 55.0–57.0% SiO2, 5.20–6.50% CaO, 23.0–25.0% Al2O3, 2.20–2.50% MgO, TiO2 <2.0%, and 0.35%–0.45% MnO, with the balance being unavoidable impurities.

[0324] The comprehensive air supply parameters include: surface air volume, humidity, air pressure, top pressure, air temperature, and tuyer area; indirect smelting parameters include corrected air volume and the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast energy after correcting the air volume; fuel parameters include the batch weight, composition, and combustion rate of coke and coke briquettes before the tuyer, as well as the hourly coal powder quantity, coal powder composition, and combustion rate before the tuyer.

[0325] The adjustment amount of hourly pulverized coal injection is less than 5.0% of the original total hourly pulverized coal injection.

[0326] It also includes step E, actual smelting result return correction: based on the actual smelting results obtained in step E, and based on the theoretical control and actual material rate, the theoretical calculation control and actual w([Si]) value, the theoretical slag and iron composition and the actual slag and iron composition, the theoretical and actual furnace output, and the theoretical and actual fuel ratio, the calculation parameters are corrected according to the calculation methods in steps B to D, and smelting continues.

[0327] Application Example 1

[0328] A. Intensive smelting of titanium slag in blast furnace vanadium-titanium ore, using a vanadium-titanium ore charge structure including sinter, high-titanium pellets, and low-silicon lump ore. Benchmark batching and verification are performed:

[0329] The chemical composition of the sinter is as follows: TFe 52.096%, SiO 26.14%, CaO 13.14%, Al 2O 32.19%, MgO 2.85%, TiO 21.337%, S 0.045%, V 2O 50.142%, MnO 0.241%, with a bulk density of 1.97 t / m³. 3 The composition of the vanadium-titanium pellets (1) is: TFe 57.32%, SiO2 4.53%, CaO 0.56%, Al2O3 2.89%, MgO 2.36%, TiO2 6.46%, V2O5 0.737%, MnO 0.23%; bulk density 2.28 t / m³ 3 The composition of the vanadium-titanium pellets (2) is as follows: TF: 53.58%, SiO2: 5.14%, CaO: 1.23%, Al2O3: 2.52%, MgO: 2.71%, TiO2: 10.14%, V2O5: 0.546%, MnO: 0.270%, with a bulk density of 2.16 t / m³. 3 The composition of the low-silica lump ore is: TFe 65.34%, SiO2 3.83%, CaO 0.030%, Al2O3 1.08%, MgO 0.010%, TiO2 0.010%, V2O5 0.030%, MnO 0.199%, with a bulk density of 2.30 t / m³. 3 .

[0330] The chemical composition of the coke is: C 85.63%, ash content 13.6%, and bulk density 0.65 t / m³. 3 The complete analysis of coke ash composition is as follows: SiO2 54.352%, CaO 2.636%, Al2O3 24.897%, MgO 0.463%, TiO2 1.55%, MnO 0.39%; the chemical composition of pulverized coal is as follows: C 77.58%, ash 10.51%, volatile matter 13.31%, fineness (-200 mesh) 67%; the complete analysis of pulverized coal ash composition is as follows: SiO2 47.245%, CaO 5.475%, Al2O3 23.85%, MgO 2.38%, TiO2 1.284%, MnO 0.370%.

[0331] Baseline conditions and material verification results:

[0332] Ore batch: 33,000 kg, coke batch (wet weight): 7,600 kg (dry weight): 7,296 kg, coke briquettes (wet weight): 500 kg (dry weight): 480 kg. Batching basis: Baseline: w([Si]) value: 0.160%; slag basicity: 1.14. Baseline material rate: 8.96 batches / h; Baseline coal quantity: 21,615 kg / h.

[0333] Ingredient verification results:

[0334] Sintered ore 60% (20%+20%+20%) + sintered small particles 2%, vanadium-titanium pellets (1) 15.0%, vanadium-titanium pellets (2) 19.0%, low-silicon lump ore 4.0%. Total furnace feed grade TFe: 53.69%.

[0335] B. Ingredient calculation, parameter and index verification analysis

[0336] B1. Benchmark ingredient calculation, parameter and index verification analysis:

[0337] For conventional blast furnace ore and coke batches, the chemical composition (full analysis) of various materials is as described in step A. Under the main reference parameters of the baseline raw materials (clinker rate, overall charge grade, coke and pulverized coal ash content), combined with the baseline operating parameters of step A (baseline coal quantity, baseline material rate, baseline w([Si])), the baseline operating parameters such as total air (air pressure, air volume), air temperature, and w([Si]) are not adjusted.

[0338] Under the baseline conditions in step A (assuming that the main raw material parameters are stable (the fluctuation ranges all meet the following conditions: clinker rate < ±1.0%, overall furnace feed grade < ±0.20%, coke < ±0.1%, and pulverized coal ash content < ±0.10%)), proceed directly to the baseline index determination step, following the steps below. The calculation order and results are as follows:

[0339] (1) Calculate the theoretical fuel ratio, utilization coefficient, smelting cycle, etc. under the basic conditions.

[0340] The calculated theoretical fuel ratio is 549.8 kg / t (dry basis); the utilization factor is 3.696 t / (m³). 3 .d); The smelting cycle is 42.4 batches (Table 1 and Table 2).

[0341] Table 1. Calculation basis conditions and verification of basic indicators

[0342]

[0343] Table 2

[0344]

[0345] (2) Output the slag and iron composition and related intermediate process results according to the baseline conditions (assuming that the changes in raw materials and fuels are all within the required range).

[0346] Taking each batch of material as a unit, the following are the fitting formulas for the reduction rates of elements such as [Si], [Ti], [Mn], and [V] in molten iron under the predetermined w([Si]) value: (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, w([Si])-V reduction rate), w([Si])-desulfurization rate fitting formula, and [S] removal rate fitting polynomial formula with predetermined w([Si]) value: Figures 3-7 ):

[0347] Based on the reduction rates of the above elements (desulfurization rate, and 100% reduction rates of [P] and [As], etc.), combined with material balance, the amounts of corresponding element oxides and S, P, and As entering the molten iron are calculated. Further calculations are made of the amounts of each element oxide and S, P, and As entering the slag, the output slag quantity (slag ratio), alkali metals, lead, zinc, titanium, sulfur load, etc., as well as the theoretical slag composition (including basicity, magnesium-aluminum ratio, etc.) and theoretical pig iron composition (theoretically calculated from the corresponding element oxides entering the molten iron) (Tables 3 to 6).

[0348] Table 3 shows the reduction rate corresponding to the baseline w([Si]) based on the fitting formula between the w([Si]) value and the reduction rate of each element.

[0349]

[0350] Note: The baseline w([Si]) is the input, and the others are automatically calculated outputs.

[0351] Table 4 Output baseline mix ratio, slag quantity (slag ratio), alkali metals, lead-zinc and titanium, sulfur load under baseline w([Si])

[0352]

[0353]

[0354] Table 5 Theoretical pig iron composition under output baseline w([Si])

[0355] project Si S P Ti As V Mn unit ％ ％ ％ ％ ％ ％ ％ numerical values 0.16 0.056 0.072 0.205 0.018 0.19 0.227

[0356] Table 6 Theoretical slag composition under output baseline w([Si])

[0357] project <![CDATA[SiO2]]> CaO MgO S <![CDATA[Al2O3]]> <![CDATA[TiO2]]> <![CDATA[V2O5]]> MnO magnesium-aluminum ratio alkalinity unit ％ ％ ％ ％ ％ ％ ％ ％ numerical values 28.73 32.63 10.66 0.72 12.51 13.65 0.43 0.64 0.852 1.14

[0358] In this example, the corrected air volume calculation is based on the air volume corrected for actual fuel consumption (the cumulative average value of the samples is 3289.0 m³). 3 / min) and the corresponding metered air volume (the cumulative average value of the samples is 2669.42m). 3The multiple of ( / min) is relatively stable, with a value between 1.22 and 1.24 times. Here, the conversion factor of the multiple of the corrected air volume and the surface air volume is used = 3289.0 / 2669.42 = 1.23 times.

[0359] When the main reference parameters of the benchmark raw materials (clinker rate, overall grade of feed into the furnace, coke ash content, and pulverized coal ash content) change beyond the stable range, the process proceeds to step B2.

[0360] B2. Analysis of batching calculations, parameters, and index verification when key verification conditions (clinker rate, overall furnace charge grade, coke and pulverized coal ash content) change:

[0361] Changes in the composition of the raw materials were detected. Specifically:

[0362] The chemical composition of the sinter is: TFe 52.26%, SiO 26.07%, CaO 12.76%, Al 2O 32.19%, MgO 2.89%, TiO 21.283%, S 0.043%, V 2O 50.14%, MnO 0.24%, with a bulk density of 1.99 t / m³. 3 The composition of the vanadium-titanium pellets (1) is: TFe 57.32%, SiO2 4.53%, CaO 0.56%, Al2O3 2.89%, MgO 2.36%, TiO2 6.46%, V2O5 0.737%, MnO 0.23%; bulk density 2.28 t / m³ 3 The composition of the vanadium-titanium pellets (2) is as follows: TF: 53.58%, SiO2: 5.14%, CaO: 1.23%, Al2O3: 2.52%, MgO: 2.71%, TiO2: 10.14%, V2O5: 0.546%, MnO: 0.270%, with a bulk density of 2.16 t / m³. 3 The composition of the low-silica lump ore is: TFe 65.34%, SiO2 3.83%, CaO 0.030%, Al2O3 1.08%, MgO 0.010%, TiO2 0.010%, V2O5 0.030%, MnO 0.199%, with a bulk density of 2.30 t / m³. 3 .

[0363] The chemical composition of the coke is: C 85.54%, ash content 13.63%, and bulk density 0.65 t / m³. 3The complete analysis of coke ash composition is as follows: SiO2 54.836%, CaO 2.936%, Al2O3 24.538%, MgO 0.753%, TiO2 1.55%, MnO 0.39%; the chemical composition of pulverized coal is as follows: C 77.98%, ash 10.56%, volatile matter 13.35%, fineness (-200 mesh) 66%; the complete analysis of pulverized coal ash composition is as follows: SiO2 47.245%, CaO 5.475%, Al2O3 23.85%, MgO 2.38%, TiO2 1.284%, MnO 0.370%.

[0364] In this example, the grade of sintered ore and the ash content of coke and pulverized coal vary. The initial batching and verification are performed according to step A. The verification data is as follows: Ore batch: 33000 kg, Coke batch (wet weight): 7600 kg (dry basis weight): 7296 kg, Coke slag batch (wet weight): 500 kg (dry basis weight): 480 kg (Note: The coke batch needs adjustment based on the raw material composition and the grade and clinker ratio after the initial batching). Batching baseline: w([Si]) value: 0.160%; slag basicity: 1.14. Baseline material rate: 8.96 batches / h, base coal quantity: 21615 kg / h (Note: Adjustments need to be made based on changes in pulverized coal ash content). After adjusting the coke batch and hourly coal quantity, the batching results will be verified and adjusted again (based on the target slag basicity).

[0365] Ingredient verification results:

[0366] Sintered ore 60% (21%+21%+21%) + sintered small particles 2%, vanadium-titanium pellets (1) 15.0%, vanadium-titanium pellets (2) 19.0%, low-silicon lump ore 1.0%. Total furnace feed grade TFe: 53.40%.

[0367] In this example, the main parameters of the raw materials and fuels exceeded the stable range (clinker rate increased by 3.0% > ±1.0%, overall feed grade decreased by 0.29% > ±0.20%, coke ash content increased by 0.03%, and pulverized coal ash content increased by 0.05%). The baseline operating parameters were adjusted according to the magnitude of the changes (including the determination of the baseline hourly coal quantity and coke batch after the change in raw materials and fuels).

[0368] The following steps are calculated in sequence: determination of hourly coal quantity after factor changes, theoretical iron content of batch, calculation of theoretical coal ratio, new coke ratio and coke-to-coke ratio, determination of new coke batch, theoretical fuel ratio of batch under changing conditions, utilization coefficient, smelting cycle, pulverized coal injection rate, etc. (see Tables 7 to 12 for details).

[0369] The concepts and formulas involved in the calculation process are as follows:

[0370] Hourly coal quantity after factor changes: l2 = l1 - (m h1 -m h2)*0.015*l1

[0371] l2 represents the hourly coal quantity after the factor change, in kg / t; l1 represents the hourly coal quantity before the factor change, in kg / t; m h1 The ash content of pulverized coal before changes in factors is expressed in kg / t; m h2 The ash content of pulverized coal after changes in factors is expressed in kg / t.

[0372] Coumarin ratio after factor changes

[0373] d2=(ΣTFe1-ΣTFe2)*0.02*d1-(S1-S2) / 5*1*d1 / 100-(w([Si])1-w([Si])2)

[0374] *0.01*d1-(J h1 -J h2 )*0.015*d1+d1

[0375] d2 is the theoretical coke-to-butadiene ratio after factor changes, kg / t; d1 is the coke-to-butadiene ratio before factor changes, kg / t; ΣTFe1 is the overall feed grade before factor changes, kg / t; ΣTFe2 is the overall feed grade after factor changes, %; S1 is the clinker yield before factor changes, %; S2 is the clinker yield after factor changes, %; J h1 The coke ash content before changes in factors, %; J h2 The percentage of coke ash after changes in factors.

[0376] Focal ratio after factor changes

[0377] k2=(ΣTFe1-ΣTFe2)*0.02*k1-(S1-S2) / 5*1*d1 / 100-(w([Si])1-w([Si])2)

[0378] *0.01*d1-(J1-J2)*0.015*k1+k1

[0379] k2 is the theoretical coke ratio after the factor change, kg / t; k1 is the coke ratio before the factor change, kg / t; ΣTFe1 is the overall grade of the furnace feed before the factor change, kg / t; ΣTFe2 is the overall grade of the furnace feed after the factor change, %; S1 is the clinker yield before the factor change, %; S2 is the clinker yield after the factor change, %; J1 is the coke ash content before the factor change, %; J2 is the coke ash content after the factor change, %.

[0380] After the factors change, the burnt batch C2 = (k2 + d2) * t 理 / 1000-J d

[0381] C2 represents the newly determined coke batch size after the change in factors, in kg / t; J d The weight of dry coke (unchanged) is kg / t.

[0382] The formulas for calculating the theoretical fuel ratio, utilization coefficient, smelting cycle, and pulverized coal injection rate are conventional formulas.

[0383] All calculations are based on a dry basis. The baseline w([Si]) is set unchanged, and adjustments are made to the coke batch and hourly coal quantity (coke yield remains unchanged) based on the original fuel variables.

[0384] (1) Calculate the theoretical fuel ratio, utilization coefficient, smelting cycle, etc. after the change of calculation conditions.

[0385] Following the calculation method and steps of B2, based on the fundamental parameters, the dry coke batch weight after changes in raw material and fuel conditions is obtained as 7369 kg / batch, and the hourly coal consumption is 21632 kg / h. The corresponding theoretical changes are: the calculated theoretical fuel ratio is 555.8 kg / t (dry basis); the utilization coefficient is 3.68 t / (m³). 3 .d); The smelting cycle is 42.1 batches (Table 7).

[0386] Table 7 shows the calculation results after changes in raw materials and fuels (compared to baseline conditions) and the verification of their indicators.

[0387]

[0388] Table 8

[0389]

[0390] Note: In this example, after adjusting the coke batch and hourly coal quantity, the verification target (alkalinity) has been achieved, and the aforementioned furnace charge structure and proportioning are maintained.

[0391] (2) Slag and iron composition and related intermediate process results after adjusting the furnace charge structure ratio, coke batch, and hourly coal quantity according to changes in raw material and fuel conditions.

[0392] Taking each batch of material as a unit, the reduction rates of elements such as [Si], [Ti], [Mn], and [V] obtained under the predetermined w([Si]) value in the molten iron are obtained by fitting (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, and w([Si])-V reduction rate), the fitting relationship of w([Si])-desulfurization rate, and the fitting polynomial relationship between [S] removal rate and predetermined w([Si]) are mentioned above. Figures 3-7 ).

[0393] In the same step B1, output the slag quantity (slag ratio), alkali metals, zinc and titanium, sulfur load, etc. after the change of raw materials and fuels, as well as the theoretical slag composition (including basicity, magnesium-aluminum ratio, etc.) and theoretical pig iron composition (Tables 9 to 12).

[0394] Table 9 shows the reduction rates corresponding to the baseline w([Si]) based on the fitting formula between the w([Si]) value and the reduction rates of each element.

[0395]

[0396] Note: The baseline w([Si]) is the input, and the others are automatically calculated outputs.

[0397] Table 10 Output variation ratio, slag quantity (slag ratio), alkali metal, zinc and titanium, sulfur load under baseline w([Si])

[0398] project Slag volume scumbag K load Na loading Zn load S load Ti load Slag alkalinity unit Kg / pi Kg / t Kg / t Kg / t Kg / t Kg / t Kg / t times Baseline conditions 8689 468 2.58 1.18 0.39 3.91 40.35 1.14 Raw material changes 8768 475 2.60 1.21 0.41 3.97 40.22 1.14

[0399] Table 11 Theoretical pig iron composition under the baseline w([Si]) after changes in output raw materials.

[0400] project Si S P Ti As V Mn unit ％ ％ ％ ％ ％ ％ ％ Baseline conditions 0.16 0.056 0.072 0.205 0.018 0.19 0.227 Raw material changes 0.16 0.057 0.071 0.204 0.032 0.165 0.366

[0401] Table 12 Theoretical slag composition under the baseline w([Si]) after outputting raw material changes.

[0402]

[0403]

[0404] The corrected air volume ratio is the same as in step B1 (1.23 times).

[0405] During the smelting process, the baseline w([Si]) often changes. The control is carried out in step C in combination with "coal regulation w([Si])".

[0406] C. Inputting the precise control of the pulverized coal injection adjustment amount w([Si]) and slag-iron composition.

[0407] The steps revolve around the specified w([Si]) that should be achieved during the blast furnace smelting process. The hourly pulverized coal injection rate is adjusted to precisely control w([Si]), and the actual w([Si]) achieved after the adjustment reaction is verified and analyzed.

[0408] According to the definition principle of the adjustment amount of pulverized coal injection for verification (the absolute value of w([Si]) and actual w([Si]) for a single furnace iron charge is less than 0.05 percentage points), based on the above, under the conditions of the first and second groups of furnace materials, it is necessary to determine whether the w([Si]) value of blast furnace iron is precisely controlled by the input adjustment amount of pulverized coal injection and the composition of slag and iron.

[0409] (1) Parameters to be collected (including calculated indirect smelting parameters and fuel parameters). Directly collected comprehensive air supply parameters include: surface air volume, humidity, air pressure, top pressure, air temperature, tuyer area, etc.; indirect smelting parameters (automatically calculated) include corrected air volume obtained according to the actual air volume correction coefficient (or fitting polynomial) and the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast kinetic energy and verification after correcting the air volume, etc. (Tables 13-15). Fuel parameters to be collected include: batch weight, composition, and combustion rate before tuyer; hourly coal powder quantity, coal powder composition, and combustion rate before tuyer. In addition, the real-time hourly coal quantity is automatically accumulated to the hour.

[0410] (2) Determination of the amount of pulverized coal injection and precise control of the amount of molten iron w([Si]).

[0411] The output results are calculated according to the principle of whether to adjust the value of molten iron w([Si]) and the steps for determining the amount of pulverized coal injection adjustment (original amount of pulverized coal injection → amount of pulverized coal injection adjustment (input) → new hourly coal quantity → theoretical material speed (obtained by combining the comprehensive blasting parameters and fuel parameters in step (1) to obtain the ton coal consumption air volume, hourly coal consumption air volume, ton coke consumption air volume, and remaining air volume after coal burning) → amount of w([Si]) affected by pulverized coal adjustment → expected amount of w([Si]) after adjusting the amount of pulverized coal → judgment of coal adjustment effect) (Tables 12-15). The output is calculated according to the following concepts and formulas:

[0412] The amount of coal adjusted is expected to affect the amount of molten iron w([Si]) w([Si]). 影响量 =(M 调 / L 实时 / (Fe pl / 1000) / (J 批 / Fe pl +J d批 / Fe pl +M

[0413] 基 ))*100 / 10

[0414] w([Si]) 影响量 The influence of the theoretical calculation on the adjustment of pulverized coal injection rate on the amount of molten iron w([Si]), %; M 调 The adjustment rate for pulverized coal injection is kg / h; L 实时 The real-time theoretical material rate, calculated based on parameters such as the real-time corrected air volume and the oxygen enrichment rate obtained from the real-time oxygen enrichment after correcting the air volume, is expressed in batches per hour (Fe). pl The theoretical iron yield per batch of ore, kg / t; J 批 The dry weight of each batch of coke is kg / batch; J d批 The dry weight of each batch of tartaric acid is kg / batch, % M 基This is the baseline coal ratio, kg / t. Note: M 调 Any input value (a multiple of 100).

[0415] in:

[0416] Real-time theoretical material rate L 实时 =(V 校 *60-V mh )*f 风 / V C / (J 批 +J d批 )*1000

[0417] L 实时 The theoretical material velocity, calculated based on real-time oxygen enrichment and corrected air volume, is expressed in batches per hour (V). 校 The corrected air volume (m) is used to measure the air volume value. 3 / min;V mh The hourly coal consumption air volume, calculated to correct air volume and oxygen enrichment rate in real time, is measured in m. 3 / h;f 风 For the specific blast furnace air utilization rate, %; V C To correct for the air volume, the air consumption per ton of coke is calculated using the oxygen enrichment rate obtained from the real-time oxygen enrichment rate, m 3 / t;J 批 The dry weight of each batch of coke is kg / batch; J d批 The dry weight of each batch of charcoal is expressed in kg / batch, %.

[0418] Corrected air volume V 校 =((J) 实 *1000*J C实 / 100*Φ C / 100+J d实 *1000*J dC实 / 100*Φ JDC )+(M 实 *1000*M C实

[0419] / 100*Φ MC ))*0.9333 / (0.21+0.29*f h2O / 8 / 100+0.79*f O2 / 100) / 24 / 60

[0420] V 校 The corrected air volume (m) is used to measure the air volume value. 3 / min; J 实 The daily dry basis consumption of coke used in the current period, in tons (t); J C实 The carbon content (%) of the coke used in the current period; Φ CThe combustion rate of coke before the tuyeres, %; J d实 The daily dry basis consumption of coking coal used in the current period, in tons (t); J dC实 The carbon content of the coking coal used in the current period, in %; Φ JDC The combustion rate of coke before the vent, %; M 实 The daily dry basis consumption of pulverized coal used in the current period, in tons (t); M C实 The carbon content (%) of the pulverized coal used in the current period; Φ MC The combustion rate of pulverized coal before the tuyeres, expressed as %; f h2O Atmospheric humidity, g / m 3 ;f O2 Oxygen enrichment rate, expressed as a percentage, calculated based on surface air volume. Note: Coke quantity (daily consumption) is based on actual values ​​over a past period under similar raw material conditions.

[0421] Oxygen enrichment rate F after adjusting air volume O2 =0.785*V O2 / 60 / (V 校 +V O2 / 60)*100

[0422] F O2 The oxygen enrichment rate (%) was calculated after correcting the surface air volume value; V O2 The current oxygen enrichment level, m 3 / h. The rest is the same as above. Air consumption per ton of coal V after correction. m =1000*M C实

[0423] / 100 / 24*22.4 / (0.21+0.29*f h2O / 100+0.79*F O2 / 100)*Φ MC

[0424] V m To correct the air volume, the air consumption per ton of coal is calculated in m. 3 / t; the rest are the same as above;

[0425] Hourly coal consumption and air volume V after adjusting for oxygen enrichment rate mh =V m *m h / 1000

[0426] V mh To correct for the hourly coal consumption air volume after adjusting for oxygen enrichment rate, m 3 / h;m h The amount is the hourly coal quantity, kg / t; the rest is the same as above.

[0427] Air consumption per ton of coke after correction V C =1000*J C实

[0428] / 100 / 24*22.4 / (0.21+0.29*f h2O / 100+0.79*F O2 / 100)*Φ C

[0429] V C To correct the air volume, the air consumption per ton of coke is calculated in m. 3 / t; the rest is the same as above.

[0430] Similarly, the theoretical combustion temperature, blower kinetic energy, and permeability index are obtained after correcting the air volume and oxygen enrichment rate (using the corrected air volume into the conventional calculation formula).

[0431] Theoretical iron content Fe pl For standard calculations, M 基 t represents the selected benchmark coal ratio.

[0432] The estimated amount of coal to be adjusted and the estimated amount of molten iron w([Si]) to be reached are w([Si]). 预计 =w([Si]) 实际 +w([Si]) 影响量

[0433] w([Si]) 预计 The expected amount of molten iron w([Si]) after adjustment by pulverized coal injection, %; w([Si]) 实际 To adjust the amount of pulverized coal injected and the actual amount of molten iron (w([Si])) exiting the furnace after the reaction, %; w([Si]) 影响量 The amount of molten iron w([Si]) affected by the theoretical calculation of the amount of pulverized coal injection adjustment is %, and its sign is determined by the increase or decrease of the amount of pulverized coal injection (increase of pulverized coal injection is "+", decrease of pulverized coal injection is "-").

[0434] The results and process parameters obtained in this example are shown in Tables 13 to 15 (based on data and operations from two natural classes).

[0435] Table 13. Data Acquisition (Calculation) and Process / Effect of Coal Adjustment Definition and Precise Control of Molten Iron w([Si]) Quantity

[0436]

[0437] Table 14

[0438]

[0439] Table 15

[0440]

[0441]

[0442]

[0443] Note: The planned w([Si]) and its range are 0.16% ± 0.05%. If the absolute value of the difference between the actual value and the planned value exceeds 0.05 percentage points, an adjustment will be made. During the period when the adjustment has not yet reacted, the actual w([Si]) value of the previous furnace will be filled in. During the period when the previous coal adjustment has not fully reacted, the next coal injection adjustment will not be carried out.

[0444] Compare the w([Si]) (w([Si]) values ​​of molten iron after coal conditioning to the iron output w([Si]) value. 实际 The control effect (reflected 3.5 hours after coal adjustment) based on the time the adjustment factor falls into place: In this example, the adjustment achieved the desired effect (coal was adjusted twice in the first shift and once in the second shift), achieving the w([Si]) control effect. Furthermore, the input hourly coal quantity adjustment amount met the requirements, and the error was checked based on the theoretical fuel ratio obtained after coal adjustment and the planned required fuel ratio (error and absolute value of fuel ratio fluctuation under unified raw material and fuel conditions < 5 kg / t). Within the range, the cycle begins. Proceed to step C3. After step C3, the cycle begins.

[0445] There were no instances where the furnace operated smoothly and the difference between the theoretical and actual material rates was greater than 1.0 batches / h (more or less).

[0446] C3. Verification of the effect of slag and iron composition prediction and control and coal adjustment quantity precise control w([Si]) after adjusting the precise control of pulverized coal injection w([Si]).

[0447] (1) Use the obtained pre-controlled w([Si]) value to obtain the slag iron composition and verify it.

[0448] Based on the above, the expected w([Si]) after the input hourly coal powder quantity reaches the reaction cycle is calculated. 预计 The values ​​are introduced into the fitting relationship (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, w([Si])-V reduction rate, w([Si])-desulfurization rate) obtained in the aforementioned (fitting relationship obtained by step B) to obtain the theoretical calculated values ​​of w([Si]), w([S]), w([P]), w(Ti]), w([As]), w([V]), w(Mn) in the molten iron of this batch; further, the theoretical calculated values ​​of w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), w(MnO) in the slag of this batch are obtained (step (1) in B1).

[0449] Furthermore, the composition of the obtained slag and iron was checked: the pre-controlled w([Si]) was... 预计The values ​​and other pig iron components such as w([S]), w([P]), w(Ti]), w([As]), w([V]), and w(Mn) were compared and verified with conventional sampling and analysis of iron samples taken within the corresponding time period (after the coal adjustment reaction cycle); the pre-controlled w([Si]) was also compared and verified. 预计 The slag components w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), and w(MnO) obtained under the specified conditions were compared and verified with the slag samples taken by conventional sampling methods at the corresponding time (end of coking and coal conditioning reaction cycle) (Tables 16 and 17).

[0450] Table 16 shows the process and effect of obtaining slag and iron composition from the pre-controlled w([Si]) value of coal adjustment (adjustment time hits the furnace) and its verification.

[0451]

[0452]

[0453] Table 17

[0454]

[0455]

[0456] Verification results: The adjustment of w([Si]) value in this example achieved the desired effect (coal was adjusted twice in the first shift and once in the second shift), achieving the control effect of w([Si]) (w([Si]) value of molten iron), and other slag and iron pre-controlled components were all within the required range.

[0457] (2) Verification of the average w([Si]) and theoretical indicators in this example

[0458] The average w([Si]) value, daily theoretical coal ratio, coke ratio, and daily actual coal ratio and coke ratio in this example were compared and verified with the daily theoretical output calculated based on the theoretical feed rate (Table 18). All values ​​met the required range. The concepts, calculation methods, and formulas of the theoretical output and theoretical indicators involved are as follows:

[0459] Theoretical output (calculated based on tapping time and interval) t 出铁理 =Σ(ROUND((time) 本炉终了 -time 上炉终了 )*24,3)*L 实时 *O 料批 / 1000*ΣTFe / 100*0.99 / 0.94)

[0460] t 出铁理The cumulative theoretical iron production (t / d) calculated based on the end-of-tapping interval of each furnace within a natural day; time 本炉终了 h represents the calendar time for the completion of this furnace operation; h: min; time. 上炉终了 The calendar operation time at the end of the previous furnace run, h:min; L 实时 The theoretical material velocity, calculated based on real-time oxygen enrichment and corrected air volume, is expressed in batches per hour. 料批 ΣTFe represents the batch weight of ore, kg / h; ΣTFe represents the overall grade of the furnace feed, %.

[0461] Theoretical output (theoretical iron output based on hourly feed rate) t 下料理 =AVERAGE(L 实时 *24*O 料批

[0462] / 1000*ΣTFe / 100*0.99 / 0.94)

[0463] t 出铁理 The daily output is the average value (t / d) obtained from the hourly theoretical iron output based on the hourly corrected air volume and oxygen enrichment rate; the rest is the same as above. The daily theoretical iron output is obtained by accumulating the hourly output to the daily output.

[0464] Theoretical fuel ratio (based on theoretical iron output per hour) calculated K 下料理 =C 干焦批 *L 实时 *24 / t 下料理 +M 小时喷煤 *24 / t 下 Cuisine

[0465] K 下料理 The hourly theoretical fuel ratio, measured in kg / t, is derived from the hourly theoretical iron content obtained by correcting the hourly air volume and oxygen enrichment rate. 小时喷煤 The value is the real-time hourly pulverized coal injection rate, in kg / h; the rest is the same as above.

[0466] During operation, it was found that the theoretical fuel ratio fluctuated within ±5 kg / t under the same raw material conditions.

[0467] Table 18 Comparison and Verification of Average Theoretical Value and Actual Value in This Example

[0468]

[0469] D. Following the previous steps (preliminary verification of blast furnace condition, adjustment of coke batch (including coke briquettes), adjustment of oxygen and control of materials, adjustment of coal and control of temperature), the raw materials and smelting parameters are fed into the furnace, and the smelting parameters are adjusted: precise control of material speed, accurate control of w([Si]) (w([Si]) value of molten iron), slag and iron composition control calculation, real-time theoretical prediction and pre-control of indicators). In this example, the process definition conditions of each step meet the requirements and are within the error range, and the materials are fed into the furnace for smelting according to the material sequence.

[0470] Furnace smelting and parameter control steps:

[0471] D1. The total amount of the four types of ore mentioned in A is 100% (in this example, titanium slag smelting in vanadium-titanium ore), along with coke (containing coke briquettes) with high ash and sulfur content, is fed into the blast furnace in the usual amount. After verifying the blast furnace condition, under constant blast temperature, full blast conditions, and oxygen-controlled feed conditions, the "quantitative modular coal adjustment for precise control of molten iron w([Si]) value" is adopted. The number of times the hourly pulverized coal amount is adjusted in each shift is ≤3 times (in this example, the first natural shift is adjusted 2 times, and the second natural shift is adjusted 1 time), thereby achieving the theoretical control of molten iron w([Si]) per day. 预计值 -Daily regulations w([Si]) 实际值 |<0.05 percentage points / day (0.034 percentage points in this example).

[0472] D2. Smelting shall be carried out under the following conditions:

[0473] This example illustrates the smelting of titanium slag from vanadium-titanium ore. The smelting parameters are as follows: hot blast pressure 0.319–0.344 MPa (full blast), top pressure 0.154–0.166 MPa, hot blast temperature 1170℃ (top blast temperature), and furnace feed air volume (corrected) 3250–3354 m³ / h. 3 / min, oxygen enrichment rate is 9408~11308m 3 / h, pulverized coal injection rate is 136-143 kg / t iron (raw material analysis exceeded the specified change once, pulverized coal injection rate 24.2-26.1%); ore batch 33.0 tons, coke batch (dry basis) 7.296-7.369 tons; coke slag batch (dry basis) 0.48 tons; w([Si]) 0.102-0.153% (vanadium-titanium ore smelting), slag basicity 1.12-1.15, molten iron temperature 1432-1452℃. All are within the specified range.

[0474] This example demonstrates adjustments made to the coke batch according to defined principles and methods. The effects of these adjustments are reflected within one smelting cycle.

[0475] In this example, the hourly pulverized coal injection rate (precise adjustment of molten iron w([Si])) was adjusted three times within two natural shifts. The adjustment amount of the hourly pulverized coal injection rate was less than 5.0% of the original hourly total pulverized coal injection rate, and the effect of the adjustment took 3.5 hours to take effect.

[0476] The adjustment effect reflects the landing time, which is resolved by the automatic search function.

[0477] The completion times for the above-mentioned influencing factors are as follows: furnace grade, slag basicity, clinker rate, and top pressure are all within one smelting cycle (4.5–5.5 hours, automatically calculated); pulverized coal injection is 3.5 hours; and air volume, air temperature, and humidity are 1 hour. The adjustment point is when the change in the corresponding influencing factor coincides with the time it takes for the adjustment factor to take effect, based on maintaining a relatively stable overall fuel ratio (the absolute value of the raw material composition deviation under the same raw material conditions (when no coke batch adjustment is required) <5 kg / t).

[0478] D3. Smelting shall be carried out under the following conditions:

[0479] In actual smelting processes, the slag ratio is 468–475 kg / t, the magnesium-aluminum ratio in the slag is 0.842–0.867, the slag basicity is 1.12–1.15, the constant blast temperature is 1170℃, the oxygen enrichment rate (after adjusting for blast volume) is 3.90–4.24%, and the permeability index is 18336–20039 m³ / t. 3 / (min.MPa), theoretical combustion temperature 2352~2374℃, actual blower velocity 261~269m / s, actual blower kinetic energy (after air volume correction) 15965~18106kg.m / s, theoretical hourly material rate 8.62~8.87 batches / h.

[0480] In this example, when oxygen is used to regulate the feed and coal to regulate the temperature, in addition to the deviation values ​​meeting the aforementioned requirements for feed rate and silicon deviation, the direct smelting parameters such as air volume, air pressure, and top pressure, as well as the indirect smelting parameters such as permeability index, theoretical combustion temperature, and blast kinetic energy obtained through automatic calculation, are all within the specified range. For vanadium-titanium ore smelting blast furnaces, the lower limit of w([Si]) and the upper limit of w(MgO) / w(Al2O3) are used.

[0481] The actual smelting results in this example have been corrected. The hourly theoretical and actual material rate, the theoretical calculated control and actual w([Si]) value, the theoretical and actual slag-iron composition, the theoretical and actual furnace output (day), and the theoretical and actual fuel ratio comparison and verification all meet the control requirements. No changes or corrections to the relevant parameters are needed.

[0482] The calculation process in step A is as follows: Knowing the full composition of the raw materials (sintered ore, pellets, lump ore, coke, pulverized coal), the furnace charge ratio is determined based on the basic w([Si]) value, the specified slag basicity, and the magnesium-aluminum ratio range.

[0483] The calculation process in step B (B1~B2) is as follows: Knowing the complete analysis of raw materials and fuels, when the fluctuation range is within the required range (step B1), the baseline operating parameters such as total air pressure, air volume, air temperature, and w([Si]) are not adjusted. The theoretical indicators, smelting cycle, reduction rates of various elements in molten iron, alkali metal and lead-zinc-titanium-sulfur loads, and slag-iron composition are calculated in conjunction with the baseline operating parameters (baseline coal quantity, base material rate, and base w([Si])). Knowing the complete analysis of raw materials and fuels, if any of the main parameters exceeds the required fluctuation range (step B2), then… The baseline operating parameters need to be adjusted according to the magnitude of changes (including the determination of the baseline hourly coal quantity and coke batch after changes in raw materials and fuels). Based on the baseline ore batch, coke-butane batch (dry basis), w([Si]) quantity, constant blast temperature, and slag basicity within the range, the indirect smelting parameters such as the proportion, coke batch, hourly pulverized coal injection rate, and smelting cycle are checked. The hourly coal quantity, theoretical iron content of the batch, theoretical coal ratio, coke ratio, coke-butane ratio, new coke batch, theoretical fuel ratio of the batch under changed basic conditions, utilization coefficient, smelting cycle, and pulverized coal injection rate are calculated in the following order after the factor changes. The concepts and calculations involved include: hourly coal quantity l2 after factor changes, coke-butane ratio d2 after factor changes, coke ratio k2 after factor changes, and coke batch C2 after factor changes. All calculations are based on a dry basis. The baseline w([Si]) is set unchanged, and the coke batch and hourly coal quantity (coke-butane unchanged) are adjusted according to the raw material and fuel variables. Other calculations include: theoretical fuel ratio of the batch, utilization coefficient, smelting cycle, and pulverized coal injection rate.

[0484] The computer verification process in step C (including steps C1 to C3) is as follows: The process is defined based on whether the hourly pulverized coal injection rate needs adjustment during smelting. If no adjustment is needed, proceed directly to the next cycle. If adjustment is required (the absolute value of w([Si]) and the actual w([Si]) is greater than 0.05 percentage points), then theoretical calculations and verification are performed using the precise control method for blast furnace w([Si]) (molten iron w([Si]) value). Knowing (directly acquiring) the comprehensive air supply parameters (including surface air volume, humidity, air pressure, top pressure, air temperature, tuyeres area, etc.) and fuel composition and related parameters (including batch weight and composition of coke and coke briquettes, and combustion rate before the tuyeres; hourly pulverized coal quantity, pulverized coal composition, and combustion rate before the tuyeres), the indirect smelting parameters are automatically calculated (including the corrected air volume obtained based on the table-actual air volume correction coefficient (or fitting polynomial), and the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast kinetic energy after the corrected air volume). The smelting control range for each parameter is as described in step E. Knowing the above relevant parameters (collection or calculation results), the calculation order and process are as follows: original pulverized coal quantity → pulverized coal adjustment quantity (input) → new hourly coal quantity → theoretical material rate (obtained by combining the comprehensive blower parameters and fuel parameters in step (1) to obtain the coal consumption volume per ton of coal, the hourly coal consumption volume, the coke consumption volume per ton of coal, and the remaining air volume after coal burning) → the amount of w([Si]) affected by the pulverized coal adjustment quantity → the expected w([Si]) amount after adjusting the pulverized coal quantity → the judgment of the coal adjustment effect. And check the control effect of w([Si]) after coal adjustment (input adjustment quantity) (including: using the obtained pre-controlled w([Si]) value to obtain the slag and iron composition and check it; compare and check the daily average w([Si]) value, daily theoretical coal ratio, coke ratio and daily actual coal ratio, coke ratio, and the theoretical output calculated based on the theoretical material rate and the daily actual output). In this step, the corrected air volume is substituted into the conventional calculation formula to obtain the corrected air volume and the theoretical combustion temperature, blast kinetic energy, permeability index, smelting cycle, etc. after correcting the oxygen enrichment rate.

[0485] The method involves repeatedly inputting the hourly pulverized coal injection rate adjustment until the theoretical expected value w([Si]) is reached, meeting the output requirements (all calculations are automatic). The calculation concepts and formulas involved are: the expected impact of the pulverized coal injection rate on the molten iron w([Si]) and the amount w([Si]). 影响量 Real-time theoretical material velocity L 实时 Corrected air volume V 校 Oxygen enrichment rate F after correcting air volume O2 , Air consumption per ton of coal after correction V m Hourly coal consumption and air volume V after adjusting for oxygen enrichment rate mh , Air consumption per ton of coke after correction V C The estimated amount of coal to be adjusted and the estimated amount of molten iron w([Si]) to be reached are w([Si]). 预计 This also includes the output of iron w([Si]). 实际The values ​​are determined and verified, and the error is checked based on the theoretical fuel ratio obtained after coal adjustment and the planned required fuel ratio. The calculation concepts and formulas involved in the process are: theoretical output (based on iron tapping time duration and interval) t 出铁理 Theoretical output (theoretical iron output based on hourly feed rate) t 下料理 Theoretical fuel ratio (based on theoretical iron output per hour) K calculated theoretically 下料理 .

[0486] The verification process in step E is as follows: based on the actual smelting results obtained in step E, the calculation parameters are corrected according to the calculation methods in steps B to D to form a closed loop.

[0487] Application Example 2

[0488] A. Intensive smelting of titanium slag in blast furnace vanadium-titanium ore, using a vanadium-titanium ore charge structure including sinter, high-titanium pellets, and low-silicon lump ore. Benchmark batching and verification are performed:

[0489] The chemical composition of the sinter is: TFe 52.26%, SiO 26.07%, CaO 12.76%, Al 2O 32.19%, MgO 2.89%, TiO 21.283%, S 0.043%, V 2O 50.14%, MnO 0.24%, with a bulk density of 1.99 t / m³. 3 The composition of the vanadium-titanium pellets (1) is: TFe 57.32%, SiO2 4.53%, CaO 0.56%, Al2O3 2.89%, MgO 2.36%, TiO2 6.46%, V2O5 0.737%, MnO 0.23%; bulk density 2.28 t / m³ 3 The composition of the vanadium-titanium pellets (2) is as follows: TF: 53.58%, SiO2: 5.14%, CaO: 1.23%, Al2O3: 2.52%, MgO: 2.71%, TiO2: 10.14%, V2O5: 0.546%, MnO: 0.270%, with a bulk density of 2.16 t / m³. 3 The composition of the low-silica lump ore is: TFe 65.34%, SiO2 3.83%, CaO 0.030%, Al2O3 1.08%, MgO 0.010%, TiO2 0.010%, V2O5 0.030%, MnO 0.199%, with a bulk density of 2.30 t / m³. 3 .

[0490] The chemical composition of the coke is: C 85.54%, ash content 13.63%, and bulk density 0.65 t / m³. 3The complete analysis of coke ash composition is as follows: SiO2 54.836%, CaO 2.936%, Al2O3 24.538%, MgO 0.753%, TiO2 1.55%, MnO 0.39%; the chemical composition of pulverized coal is as follows: C 77.98%, ash 10.56%, volatile matter 13.35%, fineness (-200 mesh) 66%; the complete analysis of pulverized coal ash composition is as follows: SiO2 47.245%, CaO 5.475%, Al2O3 23.85%, MgO 2.38%, TiO2 1.284%, MnO 0.370%.

[0491] Baseline conditions and material verification results:

[0492] Ore batch: 33,000 kg, coke batch (wet weight): 7,676 kg (dry weight): 7,369 kg, coke briquettes (wet weight): 500 kg (dry weight): 480 kg. Batching basis: Baseline: w([Si]) value: 0.160%; slag basicity: 1.14. Baseline material rate: 8.96 batches / h; Baseline coal quantity: 21,632 kg / h.

[0493] Ingredient verification results:

[0494] Sintered ore 63% (21%+21%+21%) + sintered small particles 3%, vanadium-titanium pellets (1) 15.0%, vanadium-titanium pellets (2) 19.0%, low-silicon lump ore 1.0%. Total furnace feed grade TFe: 53.40%.

[0495] B. Ingredient calculation, parameter and index verification analysis

[0496] B1. Benchmark ingredient calculation, parameter and index verification analysis:

[0497] For conventional blast furnace ore and coke batches, the chemical composition (full analysis) of various materials is as described in step A. Under the main reference parameters of the baseline raw materials (clinker rate, overall charge grade, coke and pulverized coal ash content), combined with the baseline operating parameters of step A (baseline coal quantity, baseline material rate, baseline w([Si])), the baseline operating parameters such as total air (air pressure, air volume), air temperature, and w([Si]) are not adjusted.

[0498] Under the baseline conditions in step A (assuming that the main raw material parameters are stable (the fluctuation ranges all meet the following conditions: clinker rate < ±1.0%, overall furnace feed grade < ±0.20%, coke < ±0.1%, and pulverized coal ash content < ±0.10%)), proceed directly to the baseline index determination step, following the steps below. The calculation order and results are as follows:

[0499] (1) Calculate the theoretical fuel ratio, utilization coefficient, smelting cycle, etc. under the basic conditions.

[0500] The calculated theoretical fuel ratio is 555.80 kg / t (dry basis); the utilization factor is 3.676 t / (m³). 3 .d); The smelting cycle is 42.1 batches (Tables 19 and 20).

[0501] Table 19 Calculation Basis Conditions and Verification of Basic Indicators

[0502]

[0503] Table 20

[0504]

[0505] (2) Output the slag and iron composition and related intermediate process results according to the baseline conditions (assuming that the changes in raw materials and fuels are all within the required range).

[0506] The calculation process, method, and results are the same as in application example 1.

[0507] Based on the reduction rates of the obtained elements (desulfurization rate, and 100% reduction rates of [P] and [As], etc.), combined with the material balance, the amounts of corresponding element oxides and S, P, and As entering the molten iron are calculated. Further calculations are made of the amounts of each element oxide and S, P, and As entering the slag. The output slag quantity (slag ratio), alkali metals, lead, zinc, titanium, sulfur load, etc., as well as the theoretical slag composition (including basicity, magnesium-aluminum ratio, etc.) and theoretical pig iron composition (theoretically calculated from the corresponding element oxides entering the molten iron) are obtained (Tables 21 to 24).

[0508] Table 21 shows the reduction rate corresponding to the baseline w([Si]) based on the fitting formula between the w([Si]) value and the reduction rate of each element.

[0509]

[0510] Note: The baseline w([Si]) is the input, and the others are automatically calculated outputs.

[0511] Table 22 Output baseline mix ratio, slag quantity (slag ratio), alkali metals, lead-zinc and titanium, sulfur load under baseline w([Si])

[0512]

[0513] Table 23 Theoretical pig iron composition under output benchmark w([Si])

[0514] project Si S P Ti As V Mn unit ％ ％ ％ ％ ％ ％ ％ numerical values 0.16 0.057 0.071 0.204 0.032 0.165 0.236

[0515] Table 24 Theoretical slag composition under output baseline w([Si])

[0516] project <![CDATA[SiO2]]> CaO MgO S <![CDATA[Al2O3]]> <![CDATA[TiO2]]> <![CDATA[V2O5]]> MnO magnesium-aluminum ratio alkalinity unit ％ ％ ％ ％ ％ ％ ％ ％ times times numerical values 28.85 32.91 10.90 0.71 12.55 13.41 0.43 0.69 0.868 1.14

[0517] In this example, the corrected air volume calculation is based on the air volume corrected for actual fuel consumption (the cumulative average value of the samples is 3289.0 m³). 3 / min) and the corresponding metered air volume (the cumulative average value of the samples is 2669.42m). 3 The multiple of ( / min) is relatively stable, with a value between 1.22 and 1.24 times. Here, the conversion factor of the multiple of the corrected air volume and the surface air volume is used = 3289.0 / 2669.42 = 1.23 times.

[0518] When the main reference parameters of the benchmark raw materials (clinker rate, overall grade of feed into the furnace, coke ash content, and pulverized coal ash content) change beyond the stable range, the process proceeds to step B2.

[0519] B2. Analysis of batching calculations, parameters, and index verification when key verification conditions (clinker rate, overall furnace charge grade, coke and pulverized coal ash content) change:

[0520] Changes in the composition of the raw materials were detected. Specifically:

[0521] The chemical composition of the sinter is: TFe 51.76%, SiO 26.25%, CaO 12.96%, Al 2O 32.11%, MgO 2.77%, TiO 21.253%, S 0.041%, V 2O 50.141%, MnO 0.22%, with a bulk density of 1.93 t / m³. 3 The composition of the vanadium-titanium pellets (1) is: TFe 57.32%, SiO2 4.53%, CaO 0.56%, Al2O3 2.89%, MgO 2.36%, TiO2 6.46%, V2O5 0.737%, MnO 0.23%; bulk density 2.28 t / m³ 3 The composition of the vanadium-titanium pellets (2) is as follows: TF: 53.58%, SiO2: 5.14%, CaO: 1.23%, Al2O3: 2.52%, MgO: 2.71%, TiO2: 10.14%, V2O5: 0.546%, MnO: 0.270%, with a bulk density of 2.16 t / m³. 3 The composition of the low-silica lump ore is: TFe 65.34%, SiO2 3.83%, CaO 0.030%, Al2O3 1.08%, MgO 0.010%, TiO2 0.010%, V2O5 0.030%, MnO 0.199%, with a bulk density of 2.30 t / m³. 3 .

[0522] The chemical composition of the coke is: C 85.32%, ash content 13.76%, and bulk density 0.63 t / m³. 3The complete analysis of coke ash composition is as follows: SiO2 53.868%, CaO 2.985%, Al2O3 24.538%, MgO 0.175%, TiO2 1.53%, MnO 0.39%; the chemical composition of pulverized coal is as follows: C 77.75%, ash 10.51%, volatile matter 13.40%, fineness (-200 mesh) 69%; the complete analysis of pulverized coal ash composition is as follows: SiO2 47.739%, CaO 5.365%, Al2O3 22.88%, MgO 2.31%, TiO2 1.39%, MnO 0.390%.

[0523] In this example, the grade of sintered ore and the ash content of coke and pulverized coal vary. The initial batching and verification are performed according to step A. The verification data is as follows: Ore batch: 33000 kg, Coke batch (wet weight): 7676 kg (dry weight): 7369 kg, Coke slag batch (wet weight): 500 kg (dry weight): 480 kg (Note: The coke batch needs adjustment based on the raw material composition and the grade and clinker ratio after the initial batching). Batching baseline: w([Si]) value: 0.160%; slag basicity: 1.14. Baseline material rate: 8.96 batches / h, base coal quantity: 21648 kg / h (Note: Adjustments need to be made based on changes in pulverized coal ash content). After adjusting the coke batch and hourly coal quantity, further verification and adjustments will be made based on the batching results (according to the target slag basicity).

[0524] Ingredient verification results:

[0525] Sintered ore 61.50% (20.5% + 20.5% + 20.5%) + sintered small particles 3.0%, vanadium-titanium pellets (1) 15.0%, vanadium-titanium pellets (2) 19.0%, low-silica lump ore 1.50%. Total furnace feed grade TFe: 53.14%.

[0526] In this example, key parameters of the raw materials exceeded the stable range (clinker rate decreased by 0.50%; overall feed grade decreased by 0.26% > ±0.20%; coke ash content increased by 0.13%; and pulverized coal ash content increased by 0.05%). The baseline operating parameters were adjusted based on the magnitude of the changes (including the baseline hourly coal quantity and coke batch determination after the change in raw materials):

[0527] The following steps are calculated in sequence: determination of hourly coal quantity after factor changes, theoretical iron content of batch, calculation of theoretical coal ratio, new coke ratio and coke-to-coke ratio, determination of new coke batch, theoretical fuel ratio of batch under changing conditions, utilization coefficient, smelting cycle, pulverized coal injection rate, etc. (see Tables 25 to 30 for details).

[0528] The concepts and formulas involved in the calculation process are the same as in application example 1.

[0529] (1) Calculate the theoretical fuel ratio, utilization coefficient, smelting cycle, etc. after the change of calculation conditions.

[0530] Following the calculation method and steps in B2, based on the fundamental parameters, the dry coke batch weight after changes in raw material and fuel conditions is obtained as 7378 kg / batch, and the hourly coal consumption is 21648 kg / h. The corresponding theoretical changes are: the calculated theoretical fuel ratio is 559.11 kg / t (dry basis); the utilization coefficient is 3.66 t / (m³). 3 .d); The smelting cycle is 42.1 batches (Tables 25 and 26).

[0531] Table 25 shows the calculation results after changes in raw materials and fuels (compared to baseline conditions) and the verification of their indicators.

[0532]

[0533] Table 26

[0534]

[0535] Note: In this example, after adjusting the coke batch and hourly coal quantity, the verification target (alkalinity) has been achieved, and the aforementioned furnace charge structure and proportioning are maintained.

[0536] (2) Slag and iron composition and related intermediate process results after adjusting the furnace charge structure ratio, coke batch, and hourly coal quantity according to changes in raw material and fuel conditions.

[0537] Taking each batch of material as a unit, the reduction rates of elements such as [Si], [Ti], [Mn], and [V] obtained under the predetermined w([Si]) value in the molten iron are obtained by fitting (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, and w([Si])-V reduction rate), the fitting relationship of w([Si])-desulfurization rate, and the fitting polynomial relationship between [S] removal rate and predetermined w([Si]) are mentioned above. Figures 3-7 ).

[0538] In the same step B1, output the slag quantity (slag ratio), alkali metals, zinc and titanium, sulfur load, etc. after the change of raw materials and fuels, as well as the theoretical slag composition (including basicity, magnesium-aluminum ratio, etc.) and theoretical pig iron composition (Tables 27 to 30).

[0539] Table 27 shows the reduction rate corresponding to the baseline w([Si]) based on the fitting formula between the w([Si]) value and the reduction rate of each element.

[0540]

[0541] Note: The baseline w([Si]) is the input, and the others are automatically calculated outputs.

[0542] Table 28 Output variation ratio, slag quantity (slag ratio), alkali metal, zinc and titanium, sulfur load under baseline w([Si])

[0543] project Slag volume scumbag K load Na loading Zn load S load Ti load Slag alkalinity unit Kg / pi Kg / t Kg / t Kg / t Kg / t Kg / t Kg / t times Baseline conditions 8768 475 2.60 1.21 0.41 3.97 40.22 1.14 Raw material changes 8748 476 2.62 1.14 0.41 3.95 40.76 1.14

[0544] Table 29 Theoretical pig iron composition under the baseline w([Si]) after changes in output raw materials and fuels.

[0545] project Si S P Ti As V Mn unit ％ ％ ％ ％ ％ ％ ％ Baseline conditions 0.16 0.057 0.071 0.204 0.032 0.165 0.236 Raw material changes 0.16 0.055 0.072 0.207 0.018 0.165 0.196

[0546] Table 30 Theoretical slag composition under the baseline w([Si]) after outputting raw material changes.

[0547]

[0548] The corrected air volume ratio is the same as in step B1 (1.23 times).

[0549] During the smelting process, the reference feed rate often changes, and it is controlled in conjunction with "oxygen-regulated feed" to proceed to step C.

[0550] C. Inputting the precise control of the pulverized coal injection adjustment amount w([Si]) and slag-iron composition.

[0551] The steps revolve around the specified w([Si]) that should be achieved during the blast furnace smelting process. The hourly pulverized coal injection rate is adjusted to precisely control w([Si]), and the actual w([Si]) achieved after the adjustment reaction is verified and analyzed.

[0552] According to the definition principle of the adjustment amount of pulverized coal injection for verification (the absolute value of w([Si]) and actual w([Si]) for a single furnace iron charge is less than 0.05 percentage points), based on the above, under the conditions of the first and second groups of furnace materials, it is necessary to determine whether the w([Si]) value of blast furnace iron is precisely controlled by the input adjustment amount of pulverized coal injection and the composition of slag and iron.

[0553] (1) Parameters to be collected (including calculated indirect smelting parameters and fuel parameters). Directly collected comprehensive air supply parameters include: surface air volume, humidity, air pressure, top pressure, air temperature, tuyer area, etc.; indirect smelting parameters (automatically calculated) include the corrected air volume obtained according to the actual air volume correction coefficient (or fitting polynomial) and the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast kinetic energy and verification after correcting the air volume, etc. (Tables 31-33). Fuel parameters to be collected include: batch weight, composition, and combustion rate before tuyer; hourly coal powder quantity, coal powder composition, and combustion rate before tuyer. In addition, the real-time hourly coal quantity is automatically accumulated to the hour.

[0554] (2) Determination of the amount of pulverized coal injection and precise control of the amount of molten iron w([Si]).

[0555] According to the principle of whether to adjust the value of molten iron w([Si]) and the steps for determining the amount of pulverized coal injection adjustment (original amount of pulverized coal injection → amount of pulverized coal injection adjustment (input) → new hourly coal quantity → theoretical material speed (obtained by combining the comprehensive blasting parameters and fuel parameters in step (1) to obtain the amount of air consumption per ton of coal, the amount of air consumption per hour of coal, the amount of air consumption per ton of coke, and the remaining air quantity after burning coal) → amount of w([Si]) affected by the amount of pulverized coal adjustment → expected amount of w([Si]) after adjusting the amount of pulverized coal → judgment of coal adjustment effect) the output results are calculated (Tables 31-33).

[0556] The concepts, calculation methods, and formulas involved are the same as in Application Example 1. Calculation output: The results and process parameters obtained in this example are shown in Tables 31-33 (data and operations from two natural classes).

[0557] Table 31. Data Acquisition (Calculation) and Process / Results of Coal Adjustment Definition and Precise Control of Molten Iron w([Si]) Quantity

[0558]

[0559] Table 32

[0560]

[0561]

[0562]

[0563] Table 33

[0564]

[0565]

[0566] Note: The planned w([Si]) and its range are 0.16% ± 0.05%. If the absolute value of the difference between the actual value and the planned value exceeds 0.05 percentage points, an adjustment will be made. During the period when the adjustment has not yet reacted, the actual w([Si]) value of the previous furnace will be filled in. During the period when the previous coal adjustment has not fully reacted, the next coal injection adjustment will not be carried out.

[0567] Compared with the value of w([Si]) of molten iron after coal conditioning, the output iron w([Si]) 实际The control effect (reflected 3.5 hours after coal adjustment) based on the time of adjustment factor entry: In this example, the adjustment achieved the desired effect (one coal adjustment in the first natural shift (w([Si]) deviation absolute value 0.052 percentage points, meeting the adjustment principle), and one coal adjustment in the second natural shift (w([Si]) deviation absolute value 0.054 percentage points, meeting the adjustment principle), achieving the w([Si]) control effect. Furthermore, the input hourly coal quantity adjustment amount met the requirements, and the error was checked based on the theoretical fuel ratio obtained after coal adjustment and the planned required fuel ratio (error and absolute value of fuel ratio fluctuation under unified raw material and fuel conditions < 5 kg / t), reaching the range to enter the next cycle. Proceed to step C3. After step C3, proceed to the next cycle.

[0568] There were no instances where the furnace operated smoothly and the difference between the theoretical and actual material rates was greater than 1.0 batches / h (more or less).

[0569] C3. Verification of the effect of slag and iron composition prediction and control and coal adjustment quantity precise control w([Si]) after adjusting the precise control of pulverized coal injection w([Si]).

[0570] (1) Use the obtained pre-controlled w([Si]) value to obtain the slag iron composition and verify it.

[0571] Based on the above, the expected w([Si]) after the input hourly coal powder quantity reaches the reaction cycle is calculated. 预计 The values ​​are introduced into the fitting relationship (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, w([Si])-V reduction rate, w([Si])-desulfurization rate) obtained in the aforementioned (fitting relationship obtained by step B) to obtain the theoretical calculated values ​​of w([Si]), w([S]), w([P]), w(Ti]), w([As]), w([V]), w(Mn) in the molten iron of this batch; further, the theoretical calculated values ​​of w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), w(MnO) in the slag of this batch are obtained (step (1) in B1).

[0572] Furthermore, the composition of the obtained slag and iron was checked: the pre-controlled w([Si]) was... 预计 The values ​​and other pig iron components such as w([S]), w([P]), w(Ti]), w([As]), w([V]), and w(Mn) were compared and verified with conventional sampling and analysis of iron samples taken within the corresponding time period (after the coal adjustment reaction cycle); the pre-controlled w([Si]) was also compared and verified. 预计The slag components w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), and w(MnO) obtained under the specified conditions were compared and verified with the conventional sampling and analysis of slag samples taken at the corresponding time (end of coking and coal conditioning reaction cycle) (Tables 34 and 35).

[0573] Table 34 shows the slag and iron composition obtained from the pre-control of coal adjustment w([Si]) value (adjustment time hits the furnace), the verification process, and the effect.

[0574]

[0575] Table 35

[0576]

[0577]

[0578] Verification results: The adjustment of w([Si]) value in this example achieved the desired effect (coal adjustment was performed once in the first shift and once in the second shift), achieving the control effect of w([Si]) (w([Si]) value of molten iron), and other slag and iron pre-controlled components were all within the required range.

[0579] (2) Verification of the average w([Si]) and daily theoretical indicators in this example

[0580] The average w([Si]) value, daily theoretical coal ratio, coke ratio, and daily actual coal ratio and coke ratio in this example were compared and verified with the daily theoretical output calculated based on the theoretical feed rate (Table 36). All values ​​met the required range. The concepts, calculation methods, and formulas of the theoretical output and theoretical indicators involved are the same as in application example 1, as follows:

[0581] During operation, it was found that the theoretical fuel ratio fluctuated within ±5 kg / t under the same raw material conditions.

[0582] Table 36 Comparison and Verification of Average Theoretical Value and Actual Value in This Example

[0583]

[0584]

[0585] D. Following the previous steps (preliminary verification of blast furnace condition, adjustment of coke batch (including coke briquettes), adjustment of oxygen and control of materials, adjustment of coal and control of temperature), the raw materials and smelting parameters are fed into the furnace, and the smelting parameters are adjusted: precise control of material speed, accurate control of w([Si]) (w([Si]) value of molten iron), slag and iron composition control calculation, real-time theoretical prediction and pre-control of indicators). In this example, the process definition conditions of each step meet the requirements and are within the error range, and the materials are fed into the furnace for smelting according to the material sequence.

[0586] Furnace smelting and parameter control steps:

[0587] D1. The total amount of the four types of ore mentioned in A is 100% (in this example, titanium slag smelting in vanadium-titanium ore), along with coke (containing coke briquettes) with high ash and sulfur content, is fed into the blast furnace in the usual amount. After verifying the blast furnace condition, under constant blast temperature, full blast, and oxygen-controlled feed conditions, the "quantitative coal adjustment for precise control of molten iron w([Si]) value" is adopted. The number of times the hourly pulverized coal amount is adjusted in each shift is ≤3 times (in this example, once in the first natural shift and once in the second natural shift), thereby achieving control of molten iron | daily theoretical control w([Si]). 预计值 -Daily regulations w([Si]) 实际值 |<0.05 percentage points / day (in this example, -0.004 percentage points).

[0588] D2. Smelting shall be carried out under the following conditions:

[0589] This example illustrates the smelting of titanium slag from vanadium-titanium ore. The smelting parameters are as follows: hot blast pressure 0.331–0.344 MPa (full blast), top pressure 0.159–0.170 MPa, hot blast temperature 1170℃ (top blast temperature), and furnace feed air volume (corrected) 3275–3342 m³ / h. 3 / min, oxygen enrichment is 10508~11308m 3 / h, pulverized coal injection rate is 138-142 kg / t iron (raw material analysis exceeded the specified change once, pulverized coal injection rate 24.0-26.0%); ore batch 33.0 tons, coke batch (dry basis) 7.369-7.378 tons; coke slag batch (dry basis) 0.48 tons; w([Si]) 0.117-0.214% (vanadium-titanium ore smelting), slag basicity 1.13-1.15, molten iron temperature 1441-1460℃. All are within the specified range.

[0590] This example demonstrates adjustments made to the coke batch according to defined principles and methods. The effects of these adjustments are reflected within one smelting cycle.

[0591] In this example, the hourly pulverized coal injection rate (precise adjustment of molten iron w([Si])) was adjusted twice within two natural shifts. The adjustment amount of the hourly pulverized coal injection rate was less than 5.0% of the original hourly total pulverized coal injection rate, and the effect of this adjustment took 3.5 hours to take effect.

[0592] The adjustment effect reflects the landing time, which is resolved by the automatic search function.

[0593] The completion times for the above-mentioned influencing factors are as follows: furnace grade, slag basicity, clinker rate, and top pressure are all within one smelting cycle (4.5–5.5 hours, automatically calculated); pulverized coal injection is 3.5 hours; and air volume, air temperature, and humidity are 1 hour. The adjustment point is when the change in the corresponding influencing factor coincides with the time it takes for the adjustment factor to take effect, based on maintaining a relatively stable overall fuel ratio (the absolute value of the deviation under the same raw material conditions (when no coke batch adjustment is required) <5 kg / t).

[0594] D3. Smelting shall be carried out under the following conditions:

[0595] In actual smelting processes, the slag ratio is 475–476 kg / t, the magnesium-aluminum ratio in the slag is 0.859–0.870, the slag basicity is 1.13–1.15, the constant blast temperature is 1170℃, the oxygen enrichment rate (after adjusting for blast volume) is 3.90–4.25%, and the permeability index is 18529–19096 m³ / t. 3 / (min.MPa), theoretical combustion temperature 2360~2375℃, actual blower velocity 261~269m / s, actual blower kinetic energy (after air volume correction) 16321~17551kg.m / s, theoretical hourly material rate 8.71~8.96 batches / h.

[0596] In this example, when oxygen is used to regulate the feed and coal to regulate the temperature, in addition to the deviation values ​​meeting the aforementioned requirements for feed rate and silicon deviation, the direct smelting parameters such as air volume, air pressure, and top pressure, as well as the indirect smelting parameters such as permeability index, theoretical combustion temperature, and blast kinetic energy obtained through automatic calculation, are all within the specified range. For vanadium-titanium ore smelting blast furnaces, the lower limit of w([Si]) and the upper limit of w(MgO) / w(Al2O3) are used.

[0597] The actual smelting results in this example have been corrected. The hourly theoretical and actual material rate, the theoretical calculated control and actual w([Si]) value, the theoretical and actual slag-iron composition, the theoretical and actual furnace output (daily average), and the theoretical and actual fuel ratio comparison and verification all meet the control requirements. No changes or corrections to the relevant parameters are needed.

[0598] The concepts, calculation steps, and methods of each step are the same as in application example 1.

[0599] Application Example 3

[0600] A. Intensified blast furnace ore refining using ordinary ore, employing a common ore burden structure, including sintered ore, high-silica magnesia pellets, and low-silica lump ore. Benchmark batching and verification are performed:

[0601] The chemical composition of the sinter is: TFe 53.66%, SiO 25.85%, CaO 13.31%, Al 2O 31.77%, MgO 2.32%, TiO 20.46%, S 0.045%, V 2O 50.142%, MnO 0.129%, with a bulk density of 2.03 t / m³. 3 The composition of the acidic magnesium oxide pellets is: TFe 59.14%, SiO2 6.87%, CaO 0.073%, Al2O3 1.84%, MgO 1.02%, TiO2 2.88%, V2O5 0.145%, MnO 0.097%; bulk density 2.29 t / m³ 3 The composition of the low-silica lump ore is: TFe 65.98%, SiO2 6.62%, CaO 0.20%, Al2O3 1.336%, MgO 0.05%, TiO2 0.093%, V2O5 0.030%, MnO 0.129%, with a bulk density of 2.30 t / m³. 3 .

[0602] The chemical composition of the coke is: C 84.24%, ash content 14.49%, and bulk density 0.65 t / m³. 3 The complete analysis of coke ash composition is as follows: SiO2 56.836%, CaO 2.284%, Al2O3 25.256%, MgO 0.75%, TiO2 1.55%, MnO 0.39%; the chemical composition of pulverized coal is as follows: C 76.58%, ash 11.52%, volatile matter 13.44%, fineness (-200 mesh) 71%; the complete analysis of pulverized coal ash composition is as follows: SiO2 57.245%, CaO 5.334%, Al2O3 24.17%, MgO 2.307%, TiO2 1.553%, MnO 0.390%.

[0603] Baseline conditions and material verification results:

[0604] Ore batch: 54,000 kg, coke batch (wet weight): 10,800 kg (dry weight): 10,470 kg, coke briquettes (wet weight): 700 kg (dry weight): 680 kg. Batching standards: Standard: w([Si]) value: 0.280%; slag basicity: 1.17. Standard material rate: 9.09 batches / h; Standard coal quantity: 46,915 kg / h.

[0605] Ingredient verification results:

[0606] Sintered ore 69% (23%+23%+23%), acidic magnesia pellets 24.2% (12.1%+12.1%), low-silica lump ore 6.80%. Overall furnace feed grade TFe: 55.69%.

[0607] B. Ingredient calculation, parameter and index verification analysis

[0608] B1. Benchmark ingredient calculation, parameter and index verification analysis:

[0609] For conventional blast furnace ore and coke batches, the chemical composition (full analysis) of various materials is as described in step A. Under the main reference parameters of the baseline raw materials (clinker rate, overall charge grade, coke and pulverized coal ash content), combined with the baseline operating parameters of step A (baseline coal quantity, baseline material rate, baseline w([Si])), the baseline operating parameters such as total air (air pressure, air volume), air temperature, and w([Si]) are not adjusted.

[0610] Under the baseline conditions in step A (assuming that the main raw material parameters are stable (the fluctuation ranges all meet the following conditions: clinker rate < ±1.0%, overall furnace feed grade < ±0.20%, coke < ±0.1%, and pulverized coal ash content < ±0.10%)), proceed directly to the baseline index determination step, following the steps below. The calculation order and results are as follows:

[0611] (1) Calculate the theoretical fuel ratio, utilization coefficient, smelting cycle, etc. under the basic conditions.

[0612] The calculated theoretical fuel ratio is 515.71 kg / t (dry basis); the utilization factor is 2.763 t / (m³). 3 .d); The smelting cycle is 58.6 batches (Tables 37 and 38).

[0613] Table 37 Calculation Basis Conditions and Verification of Basic Indicators

[0614]

[0615]

[0616] Table 38

[0617]

[0618] (2) Output the slag and iron composition and related intermediate process results according to the baseline conditions (assuming that the changes in raw materials and fuels are all within the required range).

[0619] Taking each batch of material as a unit, the following are the fitting formulas for the reduction rates of elements such as [Si], [Ti], [Mn], and [V] in molten iron under the predetermined w([Si]) value: (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, w([Si])-V reduction rate), w([Si])-desulfurization rate fitting formula, and [S] removal rate fitting polynomial formula with predetermined w([Si]) value: Figures 8-12 ):

[0620] Based on the reduction rates of the above elements (desulfurization rate, and 100% reduction rates of [P] and [As], etc.), combined with material balance, the amounts of corresponding element oxides and S, P, and As entering the molten iron are calculated. Further calculations are made of the amounts of each element oxide and S, P, and As entering the slag, the output slag quantity (slag ratio), alkali metals, lead, zinc, titanium, sulfur load, etc., as well as the theoretical slag composition (including basicity, magnesium-aluminum ratio, etc.) and theoretical pig iron composition (theoretically calculated from the corresponding element oxides entering the molten iron) (Tables 39 to 42).

[0621] Table 39 shows the reduction rate corresponding to the baseline w([Si]) based on the fitting formula between w([Si]) value and the reduction rate of each element.

[0622]

[0623] Note: The baseline w([Si]) is the input, and the others are automatically calculated outputs.

[0624] Table 40 Output baseline mix ratio, slag quantity (slag ratio), alkali metals, lead, zinc and titanium, sulfur load under baseline w([Si])

[0625] project Slag volume scumbag K load Na loading Zn load S load Ti load Slag alkalinity unit Kg / pi Kg / t Kg / t Kg / t Kg / t Kg / t Kg / t times numerical values 12780 404 2.65 1.09 0.79 3.41 11.08 1.17

[0626] Table 41 Theoretical pig iron composition under output reference w([Si])

[0627]

[0628]

[0629] Table 42 Theoretical slag composition under output baseline w([Si])

[0630]

[0631] In this example, the corrected air volume calculation is based on the air volume corrected for actual fuel consumption (the cumulative average value of the samples is 5606.18 m³). 3 / min) and the corresponding metered air volume (the cumulative average value of the samples is 4523.11m). 3 The multiple of ( / min) is relatively stable, with a value between 1.23 and 1.25 times. Here, the conversion factor between the corrected air volume and the surface air volume is used: 5606.18 / 4523.11 = 1.24 times.

[0632] When the main reference parameters of the benchmark raw materials (clinker rate, overall grade of feed into the furnace, coke ash content, and pulverized coal ash content) change beyond the stable range, the process proceeds to step B2.

[0633] B2. Analysis of batching calculations, parameters, and index verification when key verification conditions (clinker rate, overall furnace charge grade, coke and pulverized coal ash content) change:

[0634] Changes in the composition of the raw materials were detected. Specifically:

[0635] First change of materials:

[0636] The chemical composition of the sinter is as follows: TFe 53.36%, SiO 25.73%, CaO 13.13%, Al 2O 31.75%, MgO 2.177%, TiO 20.526%, S 0.042%, V 2O 50.029%, MnO 0.115%, with a bulk density of 2.02 t / m³. 3 The composition of the acidic magnesium oxide pellets is: TFe 59.37%, SiO2 6.756%, CaO 0.77%, Al2O3 1.785%, MgO 0.925%, TiO2 2.75%, V2O5 0.137%, MnO 0.053%; bulk density 2.30 t / m³ 3 The composition of the low-silica lump ore is: TFe 65.34%, SiO2 3.83%, CaO 0.030%, Al2O3 1.08%, MgO 0.010%, TiO2 0.010%, V2O5 0.030%, MnO 0.199%, with a bulk density of 2.30 t / m³. 3 .

[0637] The chemical composition of the coke is: C 85.05%, ash content 14.31%, and bulk density 0.63 t / m³. 3 The complete analysis of coke ash composition is as follows: SiO2 55.868%, CaO 2.985%, Al2O3 24.538%, MgO 0.553%, TiO2 390%, MnO 0.39%; the chemical composition of pulverized coal is as follows: C 77.62%, ash 11.27%, volatile matter 13.22%, fineness (-200 mesh) 72%; the complete analysis of pulverized coal ash composition is as follows: SiO2 57.245%, CaO 5.475%, Al2O3 23.85%, MgO 2.38%, TiO2 1.55%, MnO 0.390%.

[0638] Second change of materials:

[0639] The chemical composition of the sinter is: TFe 53.80%, SiO 25.73%, CaO 13.13%, Al 2O 31.75%, MgO 2.21%, TiO 20.533%, S 0.04%, V 2O 50.021%, MnO 0.104%, with a bulk density of 2.05 t / m³. 3The composition of the acidic magnesium oxide pellets is: TFe 59.61%, SiO2 6.536%, CaO 0.70%, Al2O3 1.755%, MgO 0.859%, TiO2 2.684%, V2O5 0.143%, MnO 0.049%; bulk density 2.30 t / m³ 3 The composition of the low-silica lump ore is: TFe 65.34%, SiO2 3.83%, CaO 0.030%, Al2O3 1.08%, MgO 0.010%, TiO2 0.010%, V2O5 0.030%, MnO 0.199%, with a bulk density of 2.30 t / m³. 3 .

[0640] The chemical composition of the coke is: C 85.33%, ash content 14.23%, and bulk density 0.64 t / m³. 3 The complete analysis of coke ash composition is as follows: SiO2 56.83%, CaO 2.286%, Al2O3 25.256%, MgO 0.786%, TiO2 1.55%, MnO 0.39%; the chemical composition of pulverized coal is as follows: C 77.07%, ash 11.38%, volatile matter 13.31%, fineness (-200 mesh) 71%; the complete analysis of pulverized coal ash composition is as follows: SiO2 57.24%, CaO 5.48%, Al2O3 23.85%, MgO 2.38%, TiO2 1.55%, MnO 0.370%.

[0641] In this example, the grade of sintered ore and the ash content of coke and pulverized coal are subject to change. The batching and material verification should be carried out according to step A. The verification data is as follows: Ore batch: 54,000 kg, Coke batch (wet weight): 10,800 kg (dry weight): 10,470 kg, Coke briquettes batch (wet weight): 700 kg (dry weight): 680 kg (Note: The coke batch needs to be adjusted based on the composition of the raw materials and the grade and clinker ratio after the initial batching).

[0642] Batching baseline: w([Si]) value: 0.280%; slag basicity: 1.14. Baseline material rate: 9.09 batches / h; baseline coal quantity: 46915 kg / h (Note: Adjustments are required based on changes in pulverized coal ash content). Further adjustments will be made based on the batching results (according to the target slag basicity) after adjustments to coke batch and hourly coal quantity.

[0643] Ingredient verification results:

[0644] Variable feedstock 1: 67.5% sinter (22.5% + 22.5% + 22.5%), 24.10% acidic magnesia pellets, and 8.4% low-silica lump ore. Overall furnace feed grade TFe: 55.70%.

[0645] Variable feedstock 2: 68.1% sinter (22.7% + 22.7% + 22.7%), 24.20% acidic magnesia pellets, and 7.7% low-silica lump ore. Overall furnace feed grade TFe: 55.99%.

[0646] In this example, for feedstock change 1: the main parameters of the raw materials exceed the stable range (clinker rate decreases by 1.6% > ±1.0%, overall feed grade increases by 0.001%, coke ash content decreases by 0.18% > ±0.1%, pulverized coal ash content decreases by 0.25% > ±0.1%); for feedstock change 2: the main parameters of the raw materials exceed the stable range (clinker rate increases by 0.70%, overall feed grade increases by 0.29% > ±0.20%, coke ash content decreases by 0.08%, pulverized coal ash content increases by 0.11% > ±0.1%). The baseline operating parameters are adjusted according to the magnitude of the changes (including the determination of the baseline hourly coal quantity and coke batch after the change in raw materials):

[0647] The following parameters were calculated in sequence (for two material changes): the hourly coal quantity after factor changes, the theoretical iron content of the batch, the theoretical coal ratio, the new coke ratio and coke-to-coke ratio, the determination of the new coke batch, the theoretical fuel ratio of the batch under changing conditions, the utilization coefficient, the smelting cycle, and the pulverized coal injection rate (see Tables 43 to 48 for details).

[0648] The concepts, calculation methods, and formulas involved in the calculation process are the same as in application example 1.

[0649] (1) Calculate the theoretical fuel ratio, utilization coefficient, smelting cycle, etc. after the change of calculation conditions.

[0650] The results obtained from material change 1 and material change 2 are shown in Tables 43 and 44.

[0651] Table 43 shows the calculation results after changes in raw materials and fuels (compared to baseline conditions) and the verification of their indicators.

[0652]

[0653] Table 44

[0654]

[0655] Note: In this example, after adjusting the coke batch and hourly coal quantity, the verification target (alkalinity) has been achieved, and the aforementioned furnace charge structure and proportioning are maintained.

[0656] (2) Slag and iron composition and related intermediate process results after adjusting the furnace charge structure ratio, coke batch, and hourly coal quantity according to changes in raw material and fuel conditions.

[0657] After the material change (each time), taking each batch of material as a unit, the reduction rates of elements such as [Si], [Ti], [Mn], and [V] obtained under the predetermined w([Si]) value in the molten iron are fitted with (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, and w([Si])-V reduction rate), w([Si])-desulfurization rate fitting relationship, and [S] removal rate fitting polynomial relationship with predetermined w([Si]) are mentioned above. Figures 8-12 ).

[0658] In the same step B1, output the slag quantity (slag ratio), alkali metals, zinc and titanium, sulfur load, etc. after the change of raw materials and fuels, as well as the theoretical slag composition (including basicity, magnesium-aluminum ratio, etc.) and theoretical pig iron composition (Tables 45 to 48).

[0659] Table 45 shows the reduction rate corresponding to the baseline w([Si]) based on the fitting formula between the w([Si]) value and the reduction rate of each element.

[0660]

[0661] Note: The baseline w([Si]) is the input, and the others are automatically calculated outputs.

[0662] Table 46 Output variation ratio, slag quantity (slag ratio), alkali metal, zinc and titanium, sulfur load under baseline w([Si])

[0663]

[0664] Table 47 Theoretical pig iron composition under the baseline w([Si]) after changes in output raw materials and fuels.

[0665]

[0666]

[0667] Table 48 Theoretical slag composition under the baseline w([Si]) after outputting changes in raw materials.

[0668]

[0669] The corrected air volume ratio is the same as in step B1 (both are 1.24 times).

[0670] During the smelting process, the reference feed rate often changes, and it is controlled in conjunction with "oxygen-regulated feed" to proceed to step C.

[0671] C. Inputting the precise control of the pulverized coal injection adjustment amount w([Si]) and slag-iron composition.

[0672] The steps revolve around the specified w([Si]) that should be achieved during the blast furnace smelting process. The hourly pulverized coal injection rate is adjusted to precisely control w([Si]), and the actual w([Si]) achieved after the adjustment reaction is verified and analyzed.

[0673] According to the definition principle of the adjustment amount of pulverized coal injection for verification (the absolute value of w([Si]) and actual w([Si]) for a single furnace iron charge is less than 0.05 percentage points), based on the above, under the conditions of the first and second groups of furnace materials, it is necessary to determine whether the w([Si]) value of blast furnace iron is precisely controlled by the input adjustment amount of pulverized coal injection and the composition of slag and iron.

[0674] (1) Parameters to be collected (including calculated indirect smelting parameters and fuel parameters). Directly collected comprehensive air supply parameters include: surface air volume, humidity, air pressure, top pressure, air temperature, tuyer area, etc.; indirect smelting parameters (automatically calculated) include the corrected air volume obtained according to the table-actual air volume correction coefficient (or fitting polynomial), as well as the oxygen enrichment rate, theoretical combustion temperature, permeability index, and blast kinetic energy and verification after correcting the air volume, etc. (Tables 49 to 51). Fuel parameters to be collected include: batch weight, composition, and combustion rate before tuyer; hourly coal powder quantity, coal powder composition, and combustion rate before tuyer. In addition, the real-time hourly coal quantity is automatically accumulated to the hour.

[0675] (2) Determination of the amount of pulverized coal injection and precise control of the amount of molten iron w([Si]).

[0676] The output results are calculated according to the principle of whether to adjust the value of molten iron w([Si]) and the steps for determining the amount of pulverized coal injection adjustment (original amount of pulverized coal injection → amount of pulverized coal injection adjustment (input) → new hourly coal quantity → theoretical material speed (obtained by combining the comprehensive blasting parameters and fuel parameters in step (1) to obtain the amount of air consumption per ton of coal, the amount of air consumption per hour of coal, the amount of air consumption per ton of coke, and the remaining air quantity after burning coal) → amount of w([Si]) affected by the amount of pulverized coal adjustment → expected amount of w([Si]) after adjusting the amount of pulverized coal → judgment of coal adjustment effect).

[0677] The concepts, calculation methods, and formulas involved are the same as in application example 1.

[0678] Index, etc. (using the corrected air volume into the conventional calculation formula).

[0679] The results and process parameters obtained in this example are shown in Tables 49 to 51 (based on data and operations from three natural classes).

[0680] Table 49. Data Acquisition (Calculation) and Process / Effect of Coal Adjustment Definition and Precise Control of Molten Iron w([Si]) Quantity

[0681]

[0682]

[0683] Table 50

[0684]

[0685]

[0686]

[0687] Table 51

[0688]

[0689]

[0690]

[0691] Note: The planned w([Si]) and its range are 0.16% ± 0.05%. If the absolute value of the difference between the actual value and the planned value exceeds 0.05 percentage points, an adjustment will be made. During the period when the adjustment has not yet reacted, the actual w([Si]) value of the previous furnace will be filled in. During the period when the previous coal adjustment has not fully reacted, the next coal injection adjustment will not be carried out.

[0692] Compared with the value of w([Si]) of molten iron after coal conditioning, the output iron w([Si]) 实际 The control effect (reflected 3.5 hours after coal adjustment) according to the time of adjustment factor entry: In this example, the adjustment achieved the desired effect (coal adjustment was carried out once in the first natural shift (the absolute value of w([Si]) deviation was 0.060 percentage points during adjustment, meeting the adjustment principle, and no adjustment was made before the previous adjustment had a reaction), coal adjustment was carried out once in the second natural shift (the absolute value of w([Si]) deviation was 0.060 percentage points during adjustment, meeting the adjustment principle, and no adjustment was made before the previous adjustment had a reaction), and coal adjustment was carried out once in the third natural shift (the absolute value of w([Si]) deviation was 0.070 percentage points during adjustment, meeting the adjustment principle, and no adjustment was made before the previous adjustment had a reaction), achieving the w([Si]) control effect. Furthermore, the input hourly coal quantity adjustment amount met the requirements, and the error was checked based on the theoretical fuel ratio obtained after coal adjustment and the planned required fuel ratio (error and absolute value of fuel ratio fluctuation under unified raw material and fuel conditions <5kg / t), reaching the range and entering the next cycle. Proceed to step C3. After step C3, enter the next cycle.

[0693] There were no instances where the furnace operated smoothly and the difference between the theoretical and actual material rates was greater than 1.0 batches / h (more or less).

[0694] D3. Verification of the effect of slag and iron composition prediction and control and coal adjustment quantity precise control w([Si]) after adjusting the precise control of pulverized coal injection w([Si]).

[0695] (1) Use the obtained pre-controlled w([Si]) value to obtain the slag iron composition and verify it.

[0696] Based on the above, the expected w([Si]) after the input hourly coal powder quantity reaches the reaction cycle is calculated. 预计 The values ​​are introduced into the fitting relationship (w([Si])-Si reduction rate, w([Si])-Ti reduction rate, w([Si])-Mn reduction rate, w([Si])-V reduction rate, w([Si])-desulfurization rate) obtained in the aforementioned (fitting relationship obtained by step B) to obtain the theoretical calculated values ​​of w([Si]), w([S]), w([P]), w(Ti]), w([As]), w([V]), w(Mn) in the molten iron of this batch; further, the theoretical calculated values ​​of w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), w(MnO) in the slag of this batch are obtained (step (1) in B1).

[0697] Furthermore, for the three furnaces that hit the reaction time after the three coal quantity adjustments in Table 52, the slag and iron composition was checked: the pre-controlled w([Si]) was used. 预计 The values ​​and other pig iron components such as w([S]), w([P]), w(Ti]), w([As]), w([V]), and w(Mn) were compared and verified with conventional sampling and analysis of iron samples taken within the corresponding time period (after the coal adjustment reaction cycle); the pre-controlled w([Si]) was also compared and verified. 预计 The slag components w(SiO2), w(CaO), w(MgO), w(Al2O3), w(TiO2), w(V2O5), and w(MnO) obtained under the specified conditions were compared and verified with the conventional sampling and analysis of slag samples taken at the corresponding time (end of coking and coal conditioning reaction cycle) (Table 52).

[0698] Table 52 shows the slag and iron composition obtained from the pre-controlled w([Si]) value of coal adjustment (number of furnaces hit during adjustment time), along with verification, process, and effect.

[0699]

[0700]

[0701] Verification results: The adjustment of w([Si]) value in this example achieved the desired effect (coal adjustment was performed once in the first shift, once in the second shift, and once in the third shift), achieving the desired w([Si]) (w([Si]) value of molten iron) control effect. Other slag and iron pre-controlled components were all within the required range.

[0702] (3) Verification of the average w([Si]) and theoretical indicators in this example

[0703] The average w([Si]) value, daily theoretical coal ratio, coke ratio and daily actual coal ratio, coke ratio, and the daily theoretical output calculated based on the theoretical feed rate were compared and verified with the daily actual output (Table 53), and all met the required range. The concepts, calculation methods and formulas of the theoretical output and theoretical indicators involved are the same as in application example 1.

[0704] During operation, it was found that the theoretical fuel ratio fluctuated within ±5 kg / t under the same raw material conditions.

[0705] Table 53 Comparison and verification of the average theoretical value and the actual value in this example.

[0706]

[0707] D. Following the previous steps (preliminary verification of blast furnace condition, adjustment of coke batch (including coke briquettes), adjustment of oxygen and control of materials, adjustment of coal and control of temperature), the raw materials and smelting parameters are fed into the furnace, and the smelting parameters are adjusted: precise control of material speed, accurate control of w([Si]) (w([Si]) value of molten iron), slag and iron composition control calculation, real-time theoretical prediction and pre-control of indicators). In this example, the process definition conditions of each step meet the requirements and are within the error range, and the materials are fed into the furnace for smelting according to the material sequence.

[0708] Furnace smelting and parameter control steps:

[0709] D1. The total amount of the four types of ore mentioned in A is 100% (in this example, titanium slag smelting in vanadium-titanium ore), along with coke (containing coke briquettes) with high ash and sulfur content, is fed into the blast furnace in the usual amount. After verifying the blast furnace condition, under constant blast temperature, full blast, and oxygen-controlled feed conditions, the "quantitative coal adjustment for precise control of molten iron w([Si]) value" is adopted. The number of times the hourly pulverized coal amount is adjusted in each shift is ≤3 times (in this example, once in the first shift, once in the second shift, and once in the third shift), to achieve the theoretical control of molten iron w([Si]) per day. 预计值 -Daily regulations w([Si]) 实际值 |<0.05 percentage points / day (0.006 percentage points in this example).

[0710] D2. Smelting shall be carried out under the following conditions:

[0711] This example illustrates the intensified smelting of a large blast furnace in a conventional mine. The smelting parameters are as follows: hot blast pressure 0.376–0.385 MPa (all blast), top pressure 0.184–0.192 MPa, hot blast temperature 1220℃ (top blast temperature), and furnace feed air volume (corrected) 5550–5640 m³ / h. 3 / min, oxygen enrichment is 13300~14000m 3 / h, pulverized coal injection rate is 157-170 kg / t iron (raw material analysis exceeded the specified changes twice, pulverized coal injection rate is 30.98%-31.97%); ore batch 54.0 tons, coke batch (dry basis) 10.399-10.470 tons; coke slag batch (dry basis) 0.68 tons; w([Si]) 0.21-0.31% (ordinary ore smelting), slag basicity 1.16-1.18, molten iron temperature 1440-1480℃. All are within the specified range.

[0712] This example demonstrates adjustments made to the coke batch according to defined principles and methods. The effects of these adjustments are reflected within one smelting cycle.

[0713] In this example, the hourly pulverized coal injection rate (precise adjustment of molten iron w([Si])) was adjusted three times within three shifts. The adjustment amount was less than 5.0% of the original hourly total pulverized coal injection rate, and the effect of the adjustment took 3.5 hours to materialize. The timing of the adjustment effect was automatically determined by the automatic detection function.

[0714] The completion times for the above-mentioned influencing factors are as follows: furnace grade, slag basicity, clinker rate, and top pressure are all within one smelting cycle (4.5–5.5 hours, automatically calculated); pulverized coal injection is 3.5 hours; and air volume, air temperature, and humidity are 1 hour. The adjustment point is when the change in the corresponding influencing factor coincides with the time it takes for the adjustment factor to take effect, based on maintaining a relatively stable overall fuel ratio (the absolute value of the raw material composition deviation under the same raw material conditions (when no coke batch adjustment is required) <5 kg / t).

[0715] D3. Smelting shall be carried out under the following conditions:

[0716] In actual smelting processes, the slag ratio is 380–410 kg / t, the magnesium-aluminum ratio in the slag is 0.65–0.69, the slag basicity is 1.16–1.18, the constant blast temperature is 12500℃, the oxygen enrichment rate (after adjusting for blast volume) is 2.97–3.15%, and the permeability index is 28000–3500 m³ / s. 3 / (min.MPa), theoretical combustion temperature 2321~2331℃, actual blower velocity 273~278m / s, actual blower kinetic energy (after air volume correction) 20000~21500kg.m / s, theoretical hourly material rate 8.86~9.27 batches / h.

[0717] In this example, when oxygen is used to regulate the feed and coal to regulate the temperature, in addition to the deviation values ​​meeting the aforementioned requirements for feed rate and silicon deviation, the direct smelting parameters such as air volume, air pressure, and top pressure, as well as the indirect smelting parameters such as permeability index, theoretical combustion temperature, and blast kinetic energy obtained through automatic calculation, are all within the specified range. For vanadium-titanium ore smelting blast furnaces, the lower limit of w([Si]) and the upper limit of w(MgO) / w(Al2O3) are used.

[0718] The actual smelting results in this example have been corrected. The hourly theoretical and actual material rate, the theoretical calculated control and actual w([Si]) value, the theoretical and actual slag-iron composition, the theoretical and actual furnace output (day), and the theoretical and actual fuel ratio comparison and verification all meet the control requirements. No changes or corrections to the relevant parameters are needed.

[0719] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A blast furnace smelting method for regulating w[Si] with coal temperature quantification modular precise control, characterized in that, It comprises the following steps: A, reference burden: the smelting is ordinary ore smelting or medium titanium slag smelting; When it is ordinary ore smelting, the ordinary ore furnace burden used comprises the following components in terms of mass percentage: sinter 65~72%, high-silicon acid pellet 20~28%, low-silicon lump ore 0~10%; total 100%; ore batch 53000~55000kg; When it is medium titanium slag smelting, the vanadium-titanium ore burden used comprises the following components in terms of mass percentage: sinter 60~65%, vanadium-titanium pellet 30~35%, low-silicon lump ore 0~5%, total 100%; ore batch 320000~34000kg; When it is ordinary ore smelting or medium titanium slag smelting, the coke batch is 7200~11000kg / batch of coke dry basis; the coke breeze batch is 450~700kg / batch of coke dry basis; the pulverized coal injection amount is 21.5~48.5t / h; B, burden calculation, parameter, index checking analysis: B1, reference burden calculation, parameter, index checking analysis: The whole wind pressure, air volume, air temperature and reference w [Si] unchanged, wherein the highest stable air temperature; if the factors of ordinary mineral smelting or medium titanium slag smelting fluctuate in the range of: clinker rate < ± 1.0%, comprehensive into the furnace grade < ± 0.20%, coke ash < ± 0.1%, coal ash < ± 0.10%; then: (1) calculate the theoretical fuel ratio, utilization coefficient and smelting period; (2) calculate the theoretical pig iron composition, theoretical slag composition and basicity, magnesium-aluminum ratio; (3) calculate the multiple conversion coefficient of corrected air volume and table air volume, the oxygen enrichment rate after correction air volume is 2.90~5.00%; B2, burden calculation, parameter, index checking analysis when the main checking conditions change: The whole wind pressure, wind volume, wind temperature and reference w [Si] unchanged, wherein the wind temperature is the highest stable wind temperature; if any one of the factor fluctuation ranges of ordinary mineral smelting or medium titanium slag smelting does not satisfy the following conditions: clinker rate < ±1.0%, comprehensive charging grade < ±0.20%, coke ash < ±0.1%, and coal ash < ±0.10%; then: (1) calculate the hourly coal amount, batch theoretical iron amount, theoretical coal ratio, coke ratio, coke breeze ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting period and coal injection rate after the change of factors; (2) calculate the theoretical pig iron composition, theoretical slag composition and basicity, magnesium-aluminum ratio; C. Input injection coal adjustment amount precise control w [Si] and slag iron composition: To the provisions w [Si] with the actual w [Si] to carry out pre-control deviation check, if a single furnace iron (provisions w [Si] with the actual w [Si] difference of absolute value) <0.05 percentage points, the results of the check is no need to adjust; otherwise, it is necessary to adjust; The adjustment method is: (1) collect comprehensive air supply parameters, indirect smelting parameters and fuel parameters; (2) On the basis of the original amount of injected pulverized coal, input the amount of injected pulverized coal adjustment to adjust the coal, obtain the new hourly coal amount; then through the collected comprehensive air supply parameters, indirect smelting parameters and fuel parameters, calculate the theoretical material speed, the influence of the amount of pulverized coal adjustment w [Si] and the amount of adjusted pulverized coal, and then determine the effect of adjusting the coal; w [Si] The determination condition is: (1) After inputting the coal powder adjustment amount, the theoretical predicted impact w [Si] variation amount | 0.050%; (2) w [Si] 预计 - w [Si] 规定 |<0.03% If both conditions (1) and (2) are met, and after checking the difference between the actual material speed after adjusting the coal and the specified reference material speed, the judgment result is that adjustment is not needed, then the following needs to be done w [Si] control effect check; simultaneously calculate the theoretical combustion temperature, blast kinetic energy, permeability index and smelting period after adjusting the coal; w The specific method for checking the control effect of [Si] is: To w [Si] Check of daily theoretical indexes, with the standard defined as: absolute value error rate of the difference between daily theoretical coal ratio and coke ratio, and daily actual coal ratio and coke ratio < 1.50%; if both are met, continue the process; D, smelting and parameter control: In the smelting process, the number of times of adjusting the amount of pulverized coal per shift is controlled to be less than or equal to 3 times, and the daily theoretical control of molten iron is controlled to be less than or equal to 0.05% / day. w [Si] 预计值 - daily provision w [Si] 计划值 |<0.05% / day; Smelting conditions: hot blast pressure is 0.30~0.39MPa, top pressure is 0.155~0.195Mpa, hot blast temperature is 1150℃~1250℃, corrected into the furnace air volume is 3200~5700m 3 / min, oxygen enrichment is 9400~15000m 3 / h, coal injection amount is 135~165kg / t iron, coal injection rate is 22.0~35.0%; ore batch is 33.0~55.0 tons, coke batch is 7.2~11.0 tons in dry basis, coke briquette batch is 0.45~0.70 tons in dry basis; w [Si]0.055~0.35%, slag basicity is 1.10~1.18, molten iron temperature is 1420~1480℃; during smelting, slag ratio is 380~480kg / t, magnesium-aluminum ratio in slag is 0.65~0.95, slag basicity is 1.10~1.18, control wind temperature is stable, oxygen enrichment rate is 2.90%~5.0%, permeability index is 18000~22000m 3 / (min.MPa), theoretical combustion temperature is 2300~2400℃, actual blast speed is 255~275m / s, actual blast kinetic energy is 17000~22000kg.m / S, theoretical hourly material speed is 8.5~10.0 batches.

2. Coal conditioning temperature quantification modular precise control according to claim 1 w [Si] blast furnace smelting method, characterized by, The sinter composition comprises, by mass percentage, 52.0-54.0% of TFe, 5.5-6.5% of SiO2, 13.0-13.5% of CaO, 1.75-2.19% of Al2O3, 2.30-2.90% of MgO, 0.40-1.35% of TiO2, 0.045%-0.055% of S, 0.165-0.150% of V2O5, 0.045%-0.055% of MnO, and the balance of inevitable impurities, and the bulk specific gravity is 1.90-2.10 t / m 3 ; The vanadium-titanium pellet composition comprises, in percentage by mass, 53.5-57.5% of TFe, 4.5-5.5% of SiO2, 0.55-1.35% of CaO, 2.20-2.90% of Al2O3, 2.35-2.90% of MgO, 6.40-11.0% of TiO2, 0.55-0.75% of V2O5, 0.23-0.25% of MnO, and the balance is inevitable impurities; the bulk specific gravity is 2.20-2.30 t / m 3 ; The high-silicon acid pellet composition comprises, in percentage by mass, 58.5-60.0% of TFe, 6.5-7.5% of SiO2, 0.5-1.5% of CaO, 1.80-2.10% of Al2O3, 1.0-1.5% of MgO, 2.50-3.50% of TiO2, 0.165-0.150% of V2O5, 0.045-0.055% of MnO, and the balance is inevitable impurities, with a bulk specific gravity of 2.15-2.35 t / m 3 ; The low-silicon lump ore composition comprises, by mass percentage, 64.0-66.0% of TFe, 3.0-4.5% of SiO2, 0.03-0.05% of CaO, 1.00-1.50% of Al2O3, 0.01-1.0% of MgO, TiO2<1.0%, 0.030-0.050% of V2O5, 0.110-0.160% of MnO, and the balance is inevitable impurities, and the bulk specific gravity is 2.2-2.4 t / m 3 .

3. Coal conditioning temperature quantification modular precise control according to claim 1 w [Si] blast furnace smelting method, characterized by, The comprehensive air supply parameters include: table air volume, humidity, air pressure, top pressure, air temperature and tuyere area; the indirect smelting parameters include corrected air volume, oxygen enrichment rate after correction air volume, theoretical combustion temperature, permeability index and blast kinetic energy; the fuel parameters include batch weight, composition of coke and coke breeze, and pre-tuyere combustion rate, as well as hourly pulverized coal amount, pulverized coal composition and pre-tuyere combustion rate.

4. Coal conditioning temperature quantification modular precise control according to claim 1 w [Si] blast furnace smelting method, characterized by, The adjustment amount of hourly coal injection amount is less than 5.0% of the original hourly total coal injection amount.

5. Coal conditioning temperature quantification modular precise control according to claim 1 w [Si] blast furnace smelting method, characterized by, Also included is step E, actual smelting result return correction: according to the actual smelting result obtained in step E, according to the theoretical control and actual material speed, theoretical calculation control and actual w [Si] value, theoretical and actual slag iron composition, theoretical and actual tapping output, theoretical and actual fuel ratio, continue smelting after correction of calculation parameters according to step B~D calculation method.

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