A method and system for regulating blast furnace smelting

Abstract

This invention discloses a method and system for controlling blast furnace smelting. The method includes calculating the theoretical values ​​of the hot metal quality composition based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein the hot metal quality composition includes silicon content and sulfur content; adjusting the proportion of material quantity parameters based on the content deviation between the actual and theoretical values ​​of the hot metal quality composition, combined with the hot metal temperature index; wherein the material quantity parameters include at least sinter, pellets, and coke, and are formed by raw material blending; and correcting the raw material ratio based on the adjusted material quantity parameters. This solution utilizes data to correlate the blast furnace smelting process, quantifying and adjusting the data during smelting, which can reduce furnace condition fluctuations caused by human intervention, facilitate long-term stable operation of the blast furnace, stabilize the hot metal quality index, and provide strong support for smelting high-quality steel.

Description

Technical Field

[0001] The present invention relates to the field of blast furnace smelting technology, and in particular to a method and system for controlling blast furnace smelting. Background Technology

[0002] The blast furnace smelting process involves multiple steps and requires the combination of various raw materials. The composition and quality of the raw materials are important indicators for blast furnace smelting.

[0003] The blast furnace smelting process uses a wide variety of raw materials, with significant fluctuations in composition and quality. This disrupts the smooth and stable operation of the blast furnace, leading to substantial variations in the properties of the molten iron and impacting the quality of the steel. Under current technological conditions, operators must dynamically adjust numerous process parameters in real time to minimize these fluctuations. This is a problem addressed by individual departments and specialties, each relying on their specific expertise, without a comprehensive, digitally integrated process. This presents a significant technical challenge for the company. Summary of the Invention

[0004] This invention provides a method and system for controlling blast furnace smelting to solve the problem of digital correlation control in the blast furnace smelting process.

[0005] According to one aspect of the present invention, a method for controlling blast furnace smelting is provided, comprising:

[0006] The theoretical values ​​of the quality composition of molten iron are calculated based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein, the quality composition of molten iron includes the silicon content and sulfur content of molten iron.

[0007] Based on the content deviation between the actual and theoretical values ​​of the molten iron quality components, and in conjunction with the molten iron temperature index, the proportion of material quantity parameters is adjusted; wherein, the material quantity parameters include at least sintered ore, pellet ore, and coke, and the material quantity parameters are formed by the raw material blending;

[0008] The proportions of the raw materials are adjusted based on the adjusted material quantity parameters.

[0009] Optionally, the step of adjusting the proportion of the material quantity parameter based on the content deviation between the actual and theoretical values ​​of the molten iron mass composition and in conjunction with the molten iron temperature index includes:

[0010] Based on the requirements of steel smelting, establish standards for the range of hot metal quality composition and the range of hot metal temperature control; wherein, the standards for the range of hot metal quality composition include standards for the range of hot metal silicon content and standards for the range of hot metal sulfur content;

[0011] Using the standard range for molten iron temperature control as a benchmark, the proportion of the material quantity parameter is adjusted according to the actual value of the molten iron mass composition and the standard range for molten iron mass composition.

[0012] Optionally, the step of adjusting the proportion of the material quantity parameter based on the standard of the molten iron temperature control range as a benchmark target, according to the actual value of the molten iron mass composition and the standard of the molten iron mass composition range, includes:

[0013] When the temperature of molten iron is higher than the midline of the standard for the molten iron temperature control range but not higher than the upper limit of the standard for the molten iron temperature control range, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron.

[0014] If the actual value of the silicon content in the molten iron is within the standard range of silicon content in the molten iron, then the proportion of the material quantity parameter remains unchanged;

[0015] If the actual value of the silicon content in the molten iron is higher than the upper limit of the standard range of silicon content in the molten iron, the proportion of the material quantity parameter is adjusted according to the first preset adjustment rule;

[0016] The first preset rule is: for every 0.05% increase in the content deviation above the upper limit of the standard range of silicon content in molten iron, the slag basicity is reduced by 0.02 times.

[0017] Optionally, the step of adjusting the proportion of the material quantity parameter based on the actual value of the molten iron mass composition and the molten iron mass composition range standard, using the molten iron temperature control range standard as a benchmark target, further includes:

[0018] When the temperature of molten iron exceeds the upper limit of the standard molten iron temperature control range, the coke ratio shall be reduced by 1 kg / t for every 1°C increase.

[0019] When the temperature of molten iron is lower than the lower limit of the standard molten iron temperature control range, the coke ratio is increased by 2 kg / t for every 1°C decrease.

[0020] Optionally, the step of adjusting the proportion of the material quantity parameter based on the actual value of the molten iron mass composition and the molten iron mass composition range standard, using the molten iron temperature control range standard as a benchmark target, further includes:

[0021] When the temperature of molten iron is lower than the midline of the standard for the molten iron temperature control range but not lower than the lower limit of the standard for the molten iron temperature control range, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron.

[0022] If the actual value of the silicon content in the molten iron is within the standard range of silicon content in the molten iron or is higher than the upper limit of the standard range of silicon content in the molten iron, then the proportion of the material quantity parameter remains unchanged.

[0023] If the actual value of the silicon content in the molten iron is lower than the lower limit of the standard range of silicon content in the molten iron, the proportion of the material quantity parameter is adjusted according to the second preset adjustment rule;

[0024] The second preset adjustment rule is as follows: for every 0.05% lower than the lower limit of the silicon content range standard of molten iron, the coke ratio is increased by 1 kg / t.

[0025] Optionally, when the sulfur content of the molten iron is higher than the upper limit of the standard range of sulfur content in the molten iron, the slag basicity is increased by 0.05 times for every 0.005% increase above the upper limit of the standard range of sulfur content in the molten iron.

[0026] Optionally, the step of correcting the proportion of raw materials according to the adjusted material quantity parameters includes:

[0027] Calculate the theoretical values ​​of the quality index data of the adjusted material quantity parameters;

[0028] The raw material ratio in the material quantity parameter is adjusted using a correction factor.

[0029] Wherein, the actual value of the quality index data of the material quantity parameter is equal to the product of the theoretical value of the quality index data of the material quantity parameter and the correction coefficient.

[0030] Optionally, the top five quality index data with the highest weights among the various quality index data for each of the material quantity parameters are selected as the adjustment objects.

[0031] Optionally, the step of adjusting the raw material ratio corresponding to the material quantity parameter using a correction coefficient includes:

[0032] When the correction coefficient corresponding to the quality indicator data with the highest weight is greater than the first preset value, only the proportion of raw materials corresponding to the quality indicator data with the highest weight is adjusted.

[0033] When the correction coefficient corresponding to the quality indicator data ranked second in weight is greater than the second preset value, only the proportion of raw materials corresponding to the quality indicator data ranked second in weight is adjusted.

[0034] When the correction coefficient corresponding to the quality indicator data ranked third by weight is greater than the third preset value, only the proportion of raw materials corresponding to the quality indicator data ranked third by weight is adjusted.

[0035] When the correction coefficient corresponding to the quality indicator data ranked fourth by weight is greater than the fourth preset value, only the proportion of raw materials corresponding to the quality indicator data ranked fourth by weight is adjusted.

[0036] When the correction coefficient corresponding to the quality indicator data ranked fifth by weight is greater than the fifth preset value, only the proportion of raw materials corresponding to the quality indicator data ranked fifth by weight is adjusted.

[0037] According to another aspect of the present invention, a control system for blast furnace smelting is provided, comprising:

[0038] The molten iron composition calculation module is used to calculate the theoretical values ​​of the molten iron quality composition based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein, the molten iron quality composition includes the silicon content and sulfur content of the molten iron.

[0039] The adjustment module is used to adjust the proportion of material quantity parameters based on the content deviation between the actual and theoretical values ​​of the molten iron quality composition and the molten iron temperature index, and to correct the raw material ratio according to the adjusted material quantity parameters; wherein, the material quantity parameters include at least sinter, pellets and coke, and the material quantity parameters are formed by the raw material blending.

[0040] The technical solution provided by this invention calculates the theoretical value of the quality composition of molten iron by establishing the correspondence between raw materials and the slag composition produced in the blast furnace. Based on the content deviation between the actual and theoretical values ​​of the molten iron quality composition, and combined with the molten iron temperature index, the proportion of material quantity parameters is adjusted. Finally, the raw material ratio is corrected based on the adjusted material quantity parameters. This solution uses data to correlate the blast furnace smelting process and performs quantitative adjustments during the smelting process. This reduces furnace condition fluctuations caused by human intervention, which is conducive to achieving long-term stable operation of the blast furnace, stabilizing the molten iron quality index, and providing strong support for the smelting of high-quality steel.

[0041] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A flowchart illustrating a method for controlling blast furnace smelting, provided as an embodiment of the present invention;

[0044] Figure 2 A flowchart of another blast furnace smelting control method provided in an embodiment of the present invention;

[0045] Figure 3 A flowchart of another blast furnace smelting control method provided in an embodiment of the present invention;

[0046] Figure 4 A flowchart of another blast furnace smelting control method provided in an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of a control system for blast furnace smelting provided in an embodiment of the present invention. Detailed Implementation

[0048] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] Figure 1 A flowchart of a blast furnace smelting control method provided in an embodiment of the present invention is shown below. Figure 1 The blast furnace smelting control method provided in this embodiment includes:

[0051] S110. Calculate the theoretical values ​​of the quality composition of molten iron based on the correspondence between the raw materials and the slag composition produced by the blast furnace.

[0052] Specifically, the molten iron produced by blast furnace smelting has an iron content of over 98%, and most of the chemical components other than iron in the raw materials are found in the slag. By establishing a theoretical calculation model that corresponds the raw materials to the slag composition produced by the blast furnace, the slag composition can be calculated based on the raw materials, thereby obtaining the theoretical values ​​of the molten iron's quality composition. The molten iron's quality composition includes its silicon content and sulfur content.

[0053] S120. Based on the content deviation between the actual and theoretical values ​​of the molten iron quality composition, and in conjunction with the molten iron temperature index, the proportion of material quantity parameters is adjusted.

[0054] Specifically, after calculating the theoretical value of the molten iron quality composition based on the slag composition produced by the blast furnace, the theoretical value of the molten iron quality composition is compared with the molten iron quality composition produced when the same batch of raw materials enters the silo. The actual value of the molten iron quality composition and the content deviation of the theoretical value of the molten iron quality composition are obtained. The content deviation includes the deviation of the silicon content and the sulfur content of the molten iron.

[0055] The silicon content of molten iron represents its chemical thermal energy; higher silicon content means more thermal energy, and lower silicon content means less thermal energy. High sulfur content in molten iron indicates insufficient internal heat energy in the blast furnace, while low sulfur content indicates sufficient internal heat. The temperature of molten iron directly represents the amount of thermal energy generated during blast furnace smelting. Therefore, based on the deviation between the actual and theoretical values ​​of the molten iron's composition, and in conjunction with the temperature index, the proportions of material quantity parameters are adjusted. These material quantity parameters include at least sinter, pellets, and coke, and are formed by raw material blending. For example, sinter can be produced by processing various ores (mineral powder) with auxiliary materials through fuel. Both pellets and sinter are processed from mineral powder, but the processes differ. Coke is produced by burning various coal powders with auxiliary materials.

[0056] In this embodiment, the material quantity parameter is adjusted based on whether the detected molten iron temperature meets the molten iron temperature index and the actual value of the molten iron mass composition. By adjusting the material quantity parameter, the mass composition of the molten iron can be changed to meet the requirements.

[0057] S130. Adjust the raw material ratio according to the adjusted material quantity parameters.

[0058] After determining the required material quantity parameters, the corresponding raw material control standards can be obtained, and the raw material ratio can be adjusted according to the corresponding control standards.

[0059] The technical solution provided by this invention calculates the theoretical value of the quality composition of molten iron by establishing the correspondence between raw materials and the slag composition produced in the blast furnace. Based on the content deviation between the actual and theoretical values ​​of the molten iron quality composition, and combined with the molten iron temperature index, the proportion of material quantity parameters is adjusted. Finally, the raw material ratio is corrected based on the adjusted material quantity parameters. This solution uses data to correlate the blast furnace smelting process and performs quantitative adjustments during the smelting process. This reduces furnace condition fluctuations caused by human intervention, which is conducive to achieving long-term stable operation of the blast furnace, stabilizing the molten iron quality index, and providing strong support for the smelting of high-quality steel.

[0060] Figure 2A flowchart of another blast furnace smelting control method provided in an embodiment of the present invention is shown below. Figure 2 Based on the above technical solutions, the control method provided in this embodiment includes:

[0061] S110. Calculate the theoretical values ​​of the quality composition of molten iron based on the correspondence between the raw materials and the slag composition produced by the blast furnace.

[0062] S1201. Based on the requirements of steel smelting, establish standards for the range of hot metal quality composition and the standard for hot metal temperature control.

[0063] Different types of steel require different molten iron temperatures and compositions, which are determined by the composition of the raw materials. During blast furnace smelting, the sintered ore and pellets added to the furnace are transported via conveyor belt to the blast furnace feed hopper. The composition is monitored online on the conveyor belt, with the data displayed dynamically in real time. Coke is also monitored online during transport. Based on the requirements of the steel grades being smelted, molten iron composition range standards and molten iron temperature control range standards PT1-PT2 are established. The molten iron composition range standards include silicon content range standards Si1-Si2 and sulfur content range standards S1-S2.

[0064] S1202. Using the standard of molten iron temperature control range as the benchmark, adjust the proportion of material quantity parameters according to the actual value of molten iron quality composition and the standard of molten iron quality composition range.

[0065] A standard range for molten iron temperature control is set as the benchmark target. The relationship between the actual molten iron temperature and this benchmark target is detected to determine whether the adjustment should be based on the sulfur content or the silicon content of the molten iron. The actual value of the detected molten iron quality composition (silicon content or sulfur content) is used to adjust the proportion of material quantity parameters (including but not limited to sinter, coke, sinter pellets, etc.) according to the standard range for molten iron quality composition, thereby obtaining the actual requirements for the required material quantity parameters.

[0066] S130. Adjust the raw material ratio according to the adjusted material quantity parameters.

[0067] Figure 3 A flowchart of another blast furnace smelting control method provided in an embodiment of the present invention is shown below. Figure 3 Based on the above technical solution, step S1202 specifically includes:

[0068] S121. When the temperature of molten iron is higher than the midline of the standard for the molten iron temperature control range but not higher than the upper limit of the standard for the molten iron temperature control range, the proportion of the material quantity parameter shall be adjusted according to the actual value of the silicon content of the molten iron.

[0069] In this embodiment, when setting the standard for the molten iron temperature control range as the benchmark target, the midline (PT1+PT2) / 2 of the standard for the molten iron temperature control range can be set as the benchmark target. When the detected molten iron temperature is higher than the midline (PT1+PT2) / 2 of the standard for the molten iron temperature control range but not higher than the upper limit PT2 of the standard for the molten iron temperature control range, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron.

[0070] Specifically, if the actual value of silicon content in molten iron is within the standard range of Si1-Si2, the proportion of material quantity parameters remains unchanged, and therefore the raw material ratio also remains unchanged.

[0071] If the actual silicon content of the molten iron is higher than the upper limit of the standard range Si1-Si2, the proportion of material quantity parameters is adjusted according to the first preset adjustment rule. The first preset rule is: for every 0.05% deviation above the upper limit of the standard range for silicon content in molten iron, the slag basicity is reduced by 0.02 times, and so on. That is, if the actual silicon content of the molten iron is greater than 0.05% Si2, the slag basicity is reduced by 0.02 times by adjusting the proportion of ore fed into the furnace, thereby reducing the silicon content of the molten iron. If the actual silicon content of the molten iron is greater than 0.1% Si2, the slag basicity is reduced by 0.04 times by adjusting the proportion of ore fed into the furnace… Here, slag basicity refers to the ratio of MgO to SiO2 in all furnace materials.

[0072] S122. When the temperature of molten iron is higher than the upper limit of the standard molten iron temperature control range, the coke ratio shall be reduced by 1 kg / t for every 1°C increase.

[0073] S123. When the temperature of molten iron is lower than the lower limit of the standard temperature control range for molten iron, the coke ratio shall be increased by 2 kg / t for every 1°C decrease.

[0074] The coke ratio refers to the ratio of the amount of coke consumed to the amount of pig iron produced. The coke ratio can be reduced by decreasing the amount of coke fed into the furnace. When the detected molten iron temperature exceeds the upper limit PT2 of the standard molten iron temperature control range, the coke ratio is reduced by 1 kg / t for every 1°C increase, in order to lower the molten iron temperature and control it within the required temperature range.

[0075] Similarly, when the molten iron temperature is lower than the lower limit PT1 of the standard molten iron temperature control range, the coke ratio is increased by 2 kg / t for every 1°C decrease, thereby increasing the amount of coke fed into the furnace to raise the molten iron temperature. During the process of lowering or raising the molten iron temperature, the silicon and sulfur content of the molten iron are not adjusted.

[0076] S124. When the temperature of molten iron is lower than the midline of the standard for the molten iron temperature control range but not lower than the lower limit of the standard for the molten iron temperature control range, the proportion of the material quantity parameter shall be adjusted according to the actual value of the silicon content of the molten iron.

[0077] When the detected molten iron temperature is lower than the midline (PT1+PT2) / 2 of the molten iron temperature control range standard but not lower than the lower limit PT1 of the molten iron temperature control range standard, the proportion of material quantity parameters is adjusted according to the actual value of silicon content in the molten iron.

[0078] Specifically, if the actual value of silicon content in molten iron is within the standard range or exceeds the upper limit of the standard range, the proportion of the material quantity parameter remains unchanged.

[0079] If the actual silicon content of molten iron is lower than the lower limit of the standard range for silicon content in molten iron, the proportion of the material quantity parameter is adjusted according to the second preset adjustment rule. The second preset adjustment rule is as follows: for every 0.05% difference between the actual and theoretical silicon content of molten iron below the lower limit PT1 of the standard range for silicon content in molten iron, the coke ratio is increased by 1 kg / t.

[0080] Optionally, in this embodiment, when the detected sulfur content of the molten iron exceeds the upper limit S2 of the standard range for sulfur content in molten iron, the slag basicity must be increased regardless of the range of the molten iron temperature and silicon content. Specifically, for every 0.005% increase above the upper limit S2 of the standard range for sulfur content in molten iron, the slag basicity is increased by 0.05 times. For example, increasing the amount of sinter used can be used to increase the slag basicity.

[0081] No adjustment is made when the detected sulfur content in molten iron is lower than the lower limit S1 of the standard range for sulfur content in molten iron.

[0082] Figure 4 A flowchart of another blast furnace smelting control method provided in an embodiment of the present invention is shown below. Figure 4 Based on the above technical solutions, step 130 specifically includes:

[0083] S1301. Calculate the theoretical values ​​of the quality index data of the adjusted material quantity parameters.

[0084] Specifically, each material quantity parameter has its corresponding quality index data. The quality index data for sintered ore includes Fe, FeO, MgO, Al2O3, SiO2, CaO, Mn, Cu, S, As, Sn, Pb, Zn, P, K2O, and Na2O. Physical index data includes drum index, abrasion resistance index, reducibility, average particle size, etc. The quality index data for pellets are the same as those for sintered ore. The quality index data for coke includes Ad, Vdaf, Std, Fcad, CSR, CRI, M40, Mt, etc. Each material quantity parameter is processed from the corresponding raw material and can be directly fed into the blast furnace for smelting.

[0085] The raw materials include ores x1, x2, x3...xn (including large lumps of raw ore and powdered ore that can be directly smelted in the blast furnace), pulverized coal y1, y2, y3...yn (including coking coal and pulverized coal), and auxiliary materials z1, z2, z3...zn (including limestone, dolomite, silica, etc.). In this embodiment, each raw material can be collected into the database by name upon arrival at the plant. The database can be dynamically updated in real time according to the types of raw materials used in the blast furnace.

[0086] Ore (mineral powder) is processed into sinter through a blending process (selecting and mixing any number of mineral powders from x1, x2...xn as needed, adding auxiliary materials (any number of materials from z1, z2, z3...zn), and then using fuels (coke powder, coal powder, coal gas). Coke is processed from coking coal (selecting any number of coals from y1, y2, y3...yn as needed, heating with coal gas combustion, and adding any number of auxiliary materials from z1, z2, z3...zn).

[0087] After obtaining the adjusted material quantity parameters, the theoretical values ​​of the quality index data of the material quantity parameters can be calculated based on the component detection and addition amount of various raw materials.

[0088] S1302. Adjust the corresponding raw material ratio in the material quantity parameter using the correction coefficient.

[0089] Specifically, since sintered ore, pellets, coke, etc. are all produced by heating or sintering various raw materials, there will inevitably be a deviation between the theoretical values ​​of their quality index data and the actual values ​​of the quality index data of the material quantity parameters actually produced.

[0090] In this embodiment, the theoretical values ​​of the material quantity parameter quality index data can be corrected using a correction coefficient to eliminate the influence of personnel and equipment factors on the quality of the material quantity parameter in the sintering or coking process. The correction coefficient can also be used to adjust the ore blending ratio of the material quantity parameter, thereby stabilizing its quality. The actual value of the material quantity parameter quality index data is equal to the product of the theoretical value and the correction coefficient. The correction coefficient can be obtained from the historical values ​​of the quality index data within a given period. The closer the correction coefficient is to 1, the more stable the production.

[0091] Each quality indicator data point is considered an element, and each element corresponds to a correction coefficient. When the correction coefficient is greater than 1, the proportion of the raw material with the highest content of that element can be increased; when the correction coefficient is less than 1, the proportion of the raw material with the highest content of that element can be decreased. The increase or decrease ratio is: ABS(1-correction coefficient) * the proportion of that raw material * the content of the corresponding element in that raw material. Taking sintered ore as an example, the specific method of adjusting the corresponding raw material proportion in the material quantity parameter using the correction coefficient is explained: Sintered ore is prepared from four types of mineral powder: x1, x2, x3, and x4. Among them, x1 has the highest Fe content at 63%, and X1 accounts for 30% of the ore blend. The required iron content in the sintered ore is 58%, while the iron content calculated through the ore blending process theory is 59%. Therefore, aFe * 59% = 58%, where a is the correction coefficient. According to the above formula, the correction coefficient a = 0.983 < 1. Therefore, the proportion of x1, which has the highest iron content among the four mineral powders x1, x2, x3, and x4, needs to be reduced by (1-0.983)*30%*63%=0.3213%. In other words, based on the original proportion of each raw material, the amount of x1 raw material used should be reduced by 0.3213%.

[0092] It should be understood that the raw material ratio is quickly adjusted by using the correction coefficient comparison method for sintered ore, coke, and pellets, while the content of indicators can be adjusted by adjusting the addition ratio of raw materials such as raw ore and pulverized coal that can be directly fed into the blast furnace.

[0093] In this embodiment, optionally, since there are dozens of quality indicators for sinter, coke, pulverized coal, pellets, raw ore, and auxiliary materials, and each indicator has a different degree of influence on the blast furnace, reducing one indicator may lead to an increase in other indicators, all of which will affect the blast furnace. Therefore, the top five quality indicators with the corresponding weights are selected from the multiple quality indicator data of each material quantity parameter as the adjustment objects. The top five quality indicators for sinter, pellets, and raw ore are: Fe, SiO2, Al2O3, FeO, and drum index; the top five quality indicators for coke are: CSR, Ad, Std, Fcad, and M40; and the top five quality indicators for pulverized coal are: Fcad, Ad, Std, Vdaf, and particle size.

[0094] Specifically, step S1302 includes:

[0095] When the correction coefficient corresponding to the quality indicator data with the highest weight is greater than the first preset value, only the proportion of raw materials corresponding to the quality indicator data with the highest weight is adjusted.

[0096] When the correction coefficient corresponding to the second-ranked quality indicator data is greater than the second preset value, only the proportion of raw materials corresponding to the second-ranked quality indicator data will be adjusted.

[0097] When the correction coefficient corresponding to the quality indicator data ranked third by weight is greater than the third preset value, only the proportion of raw materials corresponding to the quality indicator data ranked third by weight is adjusted.

[0098] When the correction coefficient corresponding to the quality indicator data ranked fourth by weight is greater than the fourth preset value, only the proportion of raw materials corresponding to the quality indicator data ranked fourth by weight is adjusted.

[0099] When the correction coefficient corresponding to the fifth-ranked quality indicator data is greater than the fifth preset value, only the proportion of raw materials corresponding to the fifth-ranked quality indicator data will be adjusted.

[0100] For example, the impact of the top five quality indicators of sinter, coke, pulverized coal, pellets, raw ore, and auxiliary materials on the quality of blast furnace hot metal is ranked. When the correction coefficient corresponding to the theoretical calculated value and the actual product test value of the first element is greater than 0.01, the proportion of the first element is adjusted, and the other four elements are adjusted accordingly without special adjustments. When the correction coefficient of the second element is greater than 0.02, the correction coefficient of the third element is greater than 0.03, the correction coefficient of the fourth element is greater than 0.04, and the correction coefficient of the fifth element is greater than 0.05, the corresponding adjustments are made according to the above method. This scheme ranks the quality indicator data according to their impact on the quality of blast furnace hot metal, adjusts the first element that exceeds the standard first, and adjusts only one element at a time, without adjusting the others. This scheme can ensure that the composition of hot metal meets the requirements and ensures the smooth and stable operation of the blast furnace.

[0101] Optionally, the present invention also provides a control system for blast furnace smelting, which can be used to execute the control method for blast furnace smelting provided in any embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of a control system for blast furnace smelting provided in an embodiment of the present invention, with reference to... Figure 5 The control system for this blast furnace smelting includes:

[0102] The molten iron composition calculation module 11 is used to calculate the theoretical value of the molten iron quality composition based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein, the molten iron quality composition includes the silicon content and sulfur content of the molten iron.

[0103] The adjustment module 12 is used to adjust the proportion of material quantity parameters based on the content deviation between the actual and theoretical values ​​of the molten iron quality composition and the molten iron temperature index, and to correct the raw material ratio according to the adjusted material quantity parameters. The material quantity parameters include at least sinter, pellets, and coke, and are formed by the raw material blending. The adjustment module 12 can also be used to execute specific method steps for adjusting the proportion of material quantity parameters.

[0104] Since the blast furnace smelting control system provided in this embodiment can execute the blast furnace smelting control methods provided in any of the above embodiments, this blast furnace smelting control system also possesses the beneficial effects described in any of the above embodiments. The blast furnace smelting control system provided in this embodiment, by establishing standards for the control range of blast furnace molten iron quality composition and temperature control range, automatically calculates the required composition of sinter, coke, pellets, and auxiliary materials based on the blast furnace molten iron quality composition (silicon content, sulfur content) control range, thereby obtaining a sinter and coke blending scheme. Through continuous system correction, a molten iron quality composition standard control system is established, connecting the entire blast furnace smelting process and achieving full-process digitalization. Furthermore, the operation of this system greatly reduces furnace condition fluctuations caused by human intervention, which is conducive to achieving long-term stable operation of the blast furnace. Blast furnace fuel consumption can be reduced by 3-5 kg / ton of iron, which is beneficial for further reducing blast furnace energy consumption.

[0105] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0106] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for controlling blast furnace smelting, characterized in that, include: The theoretical values ​​of the quality composition of molten iron are calculated based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein, the quality composition of molten iron includes the silicon content and sulfur content of molten iron. Based on the requirements of steel smelting, establish standards for the range of hot metal quality composition and the range of hot metal temperature control; wherein, the standards for the range of hot metal quality composition include standards for the range of hot metal silicon content and standards for the range of hot metal sulfur content; Using the hot metal temperature control range standard as a benchmark, the proportion of material quantity parameters is adjusted according to the actual value of the hot metal quality composition and the hot metal quality composition range standard; wherein, the material quantity parameters include at least sintered ore, pellet ore and coke, and the material quantity parameters are formed by the raw material blending; The proportions of the raw materials are adjusted according to the adjusted material quantity parameters; The steps of adjusting the proportion of the material quantity parameter based on the standard of the molten iron temperature control range as a benchmark target, according to the actual value of the molten iron mass composition and the standard of the molten iron mass composition range, include: When the temperature of molten iron is higher than the midline of the standard for the molten iron temperature control range but not higher than the upper limit of the standard for the molten iron temperature control range, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron. If the actual value of the silicon content in the molten iron is within the standard range of silicon content in the molten iron, then the proportion of the material quantity parameter remains unchanged; If the actual value of the silicon content in the molten iron is higher than the upper limit of the standard range of silicon content in the molten iron, the proportion of the material quantity parameter is adjusted according to the first preset adjustment rule; The first preset adjustment rule is: for every deviation between the actual and theoretical values ​​of the molten iron quality components that exceeds the upper limit of the standard range of silicon content in molten iron by 0.05%, the slag basicity is reduced by 0.02 times. When the temperature of molten iron exceeds the upper limit of the standard molten iron temperature control range, the coke ratio shall be reduced by 1 kg / t for every 1°C increase. When the temperature of molten iron is lower than the lower limit of the standard molten iron temperature control range, the coke ratio shall be increased by 2 kg / t for every 1°C below the standard. When the temperature of molten iron is lower than the midline of the standard for the molten iron temperature control range but not lower than the lower limit of the standard for the molten iron temperature control range, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron. If the actual value of the silicon content in the molten iron is within the standard range of silicon content in the molten iron or is higher than the upper limit of the standard range of silicon content in the molten iron, then the proportion of the material quantity parameter remains unchanged. If the actual value of the silicon content in the molten iron is lower than the lower limit of the standard range of silicon content in the molten iron, the proportion of the material quantity parameter is adjusted according to the second preset adjustment rule; The second preset adjustment rule is as follows: for every deviation between the actual and theoretical values ​​of the molten iron quality components that is less than 0.05% of the lower limit of the standard range of silicon content in molten iron, the coke ratio is increased by 1 kg / t.

2. The control method for blast furnace smelting according to claim 1, characterized in that, When the sulfur content of the molten iron is higher than the upper limit of the standard range for sulfur content in molten iron, the slag basicity shall be increased by 0.05 times for every 0.005% increase above the upper limit of the standard range for sulfur content in molten iron.

3. The control method for blast furnace smelting according to claim 1, characterized in that, The step of correcting the raw material ratio based on the adjusted material quantity parameters includes: Calculate the theoretical values ​​of the quality index data of the adjusted material quantity parameters; The raw material ratio in the material quantity parameter is adjusted using a correction factor. Wherein, the actual value of the quality index data of the material quantity parameter is equal to the product of the theoretical value of the quality index data of the material quantity parameter and the correction coefficient.

4. The control method for blast furnace smelting according to claim 3, characterized in that, For each of the material quantity parameters, the top five quality index data with the highest corresponding weights are selected as the adjustment objects.

5. A blast furnace smelting control system, used to execute the blast furnace smelting control method according to any one of claims 1-4, characterized in that, include: The molten iron composition calculation module is used to calculate the theoretical values ​​of the molten iron quality composition based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein, the molten iron quality composition includes the silicon content and sulfur content of the molten iron. The adjustment module is used to adjust the proportion of material quantity parameters based on the content deviation between the actual and theoretical values ​​of the molten iron quality composition and the molten iron temperature index, and to correct the raw material ratio according to the adjusted material quantity parameters; wherein, the material quantity parameters include at least sinter, pellets and coke, and the material quantity parameters are formed by the raw material blending.

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