Method for evaluating and controlling quality of charging raw materials of blast furnace

Abstract

The invention discloses a blast furnace charging raw material quality evaluation and control method, which comprises the following steps: S1, periodically collecting blast furnace production data and charging material quality information, and combining three-dimensional influence factors of influence on charging comprehensive grade, influence on blast furnace air permeability and influence on blast furnace molten iron quality to obtain a charging material quality evaluation result; determining index factors influencing the quality of the raw materials; s2, determining a scoring rule of each index factor; s3, completing specific scoring of each current index factor according to the determined scoring rule; and S4, according to a scoring result of each index factor, calculating and determining a current raw material quality scoring index, and completing raw material quality evaluation. According to the evaluation and control method for the blast furnace raw material quality, real-time monitoring of the blast furnace raw fuel quality is achieved, a blast furnace operator can comprehensively know the blast furnace raw material quality condition, and reference is provided for subsequent decision making.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a method for evaluating and controlling the quality of raw materials entering a blast furnace. Background Art

[0002] The modern blast furnace is the largest industrial reactor in the world, with an effective volume ranging from tens or hundreds of cubic meters to thousands of cubic meters or even more than 6,000 cubic meters. By the end of 2022, there are nearly 30 super-large blast furnaces with a capacity of more than 4,000 cubic meters in China. The blast furnace production process occupies a very important position in steel enterprises. It consumes about 70% of the raw materials in steel enterprises, reduces iron from iron ore to metallic iron, and provides raw materials such as molten iron and blast furnace gas for subsequent processes such as steelmaking. It is an important part of steel enterprises. The blast furnace smelting process is extremely complicated, especially for super-large blast furnaces with a capacity of more than 4,000 cubic meters. During normal production, there are nearly 10,000 tons of materials in the blast furnace, and the vertical height of the material column exceeds 30 meters. The three-phase movement of gas, solid and liquid and a series of chemical reactions occur continuously in the blast furnace 24 hours a day. Through continuous efforts and experience summarization, blast furnace workers of all generations have summarized the blast furnace operation methods into air supply system, material distribution system, heat system, slag making system and cooling system, and also summarized the experience of "seven parts of raw materials and three parts of operation", indicating that raw materials are the basis of blast furnace smelting. With the development of blast furnace ironmaking technology, high utilization coefficient and low cost operation, large-scale blast furnaces, high coal ratio and low coke ratio operation and the continuous extension of blast furnace life, the quality requirements of blast furnaces for raw materials are also constantly increasing.

[0003] The steel industry has corresponding recommended standards for the quality conditions of raw materials used in blast furnaces, such as "Design Specifications for Blast Furnace Ironmaking Engineering" (GB 50427-2015), "Design Specifications for Blast Furnace Pulverized Coal Injection Engineering" (GB 50607-2010), "Technical Requirements for Blast Furnace Injection of Semi-coke" (T / SSEA0095-2020), etc., but steel companies will have corresponding procurement and use standards based on their own raw material acquisition conditions, production process performance and corporate business strategies. However, the steel industry has not yet reached a consensus on what indicators to use to evaluate whether raw materials meet production standards. When companies communicate and benchmark, they often compare specific indicator values, but based on blast furnace capacity, production indicators, process equipment configuration and corporate resource acquisition, the comparison of specific indicator values ​​is often meaningless. At present, blast furnace production cannot comprehensively evaluate whether the quality of the raw materials used can meet the production level. At the same time, companies have no clear and unified evaluation method for the support of blast furnace raw material conditions by previous processes such as procurement, logistics, coal and ore blending, sintering and coking.

[0004] The invention application with application number: CN2010105457299 discloses "a blast furnace raw material screen life analysis and quality control system", including a blast furnace raw material screen start and stop control and screen weight detection equipment and a screen life analysis and quality control module. The screen life analysis and quality control module includes an automatic data acquisition module, a data validity judgment module, a database storage module, a data extraction module, a screen life extraction module, a screen life analysis module, an alarm prompt module, a screen replacement and information input module, and a history query module; the screen life analysis and quality control modules are all run on an industrial computer; the screen life analysis and quality control module is based on the automatic data acquisition module, the data validity judgment module, the data extraction module, the screen life extraction module, the screen life analysis module, and the alarm prompt module to make real-time judgments and alarms on the operation status of the screen.

[0005] The invention application number is CN2017107806065, which discloses "a method of using scanning radar to achieve 4000m 3 The method includes obtaining the material surface shape, calculating the material surface O / C ratio distribution, constructing the upper adjustment case library of the blast furnace, evaluating the furnace cylinder condition, evaluating the slag and iron discharge, determining the tuyere air inlet area and wind speed, constructing the upper and lower adjustment case library of the blast furnace, matching the furnace condition, optimizing the furnace condition, and a furnace condition adjustment unit.

[0006] The invention application with application number: CN2022107251306 discloses "a system and method for online real-time evaluation of the quality stability of incoming raw materials". The system includes: a data acquisition unit, used to obtain the original data of the component content of the incoming raw materials; a drawing unit, used to draw a box plot of the raw material components according to user needs using the original data of the component content of the incoming raw materials; an analysis unit, used to analyze the raw material quality stability according to the box plot; a display unit, used to display the box plot drawn by the drawing unit and the analysis results obtained by the analysis unit. Summary of the invention

[0007] The object of the present invention is to provide

[0008] In order to achieve the above technical objectives, the present invention provides a method for evaluating and controlling the quality of raw materials entering a blast furnace, and the technical scheme thereof is as follows:

[0009] A method for evaluating and controlling the quality of raw materials entering a blast furnace comprises the following steps:

[0010] S1: Periodically collect blast furnace production data and quality information of incoming materials, and determine the index factors affecting raw material quality by combining the influencing factors of the three dimensions of the comprehensive grade of incoming materials, the permeability of blast furnaces, and the quality of molten iron in blast furnaces;

[0011] S2: Determine the scoring rules for each indicator factor;

[0012] S3: Complete the specific scoring of each current indicator factor according to the determined scoring rules;

[0013] S4: Based on the scoring results of each indicator factor, calculate and determine the current raw material quality score index to complete the raw material quality evaluation.

[0014] Further,

[0015] The index factors determined in step S1 are specifically: an ore quality index factor, a fuel quality index factor and a slot index factor.

[0016] Further,

[0017] The ore quality index factors include: sintered ore quality index factor, pelletized ore quality index factor and lump ore quality index factor;

[0018] The fuel quality index factors include: coke quality index factor and pulverized coal injection quality index factor;

[0019] The slot index factors include: sintered ore slot index, pelletized ore slot index, lump ore slot index and coke slot index.

[0020] Further,

[0021] The sintered ore quality index factors are composed of six indexes: total iron content, ferrous iron content, basicity, drum strength, low-temperature reduction pulverization rate, and average particle size;

[0022] The pellet quality index factor is composed of three indexes: total iron content, compressive strength and expansion index;

[0023] The lump ore quality index factor is composed of two indexes: total iron content and thermal cracking index;

[0024] The coke quality index factor is composed of five indexes: ash content, sulfur content, average particle size, post-reaction strength and reactivity;

[0025] The quality index factor of the injected coal powder is composed of four indexes: ash content, sulfur content, fixed carbon content and calorific value.

[0026] Further,

[0027] By determining the scoring rules of each indicator in the sinter quality indicator factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the sinter quality indicator factor is determined;

[0028] By determining the scoring rules for each indicator in the pellet quality index factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the pellet quality index factor is determined;

[0029] By determining the scoring rules for each indicator in the lump ore quality indicator factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the lump ore quality indicator factor score is determined;

[0030] By determining the scoring rules of each indicator in the coke quality index factor, and according to the scoring rules and combining the average calculation of the real-time score values ​​of each indicator, the coke quality index factor score is determined;

[0031] By determining the scoring rules for each indicator in the pulverized coal injection quality index factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the pulverized coal injection quality index factor is determined;

[0032] The slot indicator factor score is determined by determining the scoring rules for each indicator in the slot indicator factor and calculating the average of the real-time score values ​​of each indicator based on the scoring rules.

[0033] Further,

[0034] The total iron content greater than 57.5% is set as a normal value, with a corresponding value of 80 points; the value falling within the interval [57, 57.5]% is set as a caution value, with a corresponding value of 60 points; less than 57% is set as an abnormal value, with a corresponding value of 40 points. Based on this, the scoring rule for the total iron content index in the sinter ore quality index factor is determined;

[0035] The ferrous content falling within the interval (7, 9)% is set as a normal value, and the corresponding value is 80 points; the ferrous content falling within the interval [6, 7]% or the interval [9, 10]% is set as a caution value, and the corresponding value is 60 points; less than 6% or greater than 10% is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the ferrous content index in the sintered ore quality index factor is determined;

[0036] The alkalinity greater than 1.8 is set as a normal value, with a corresponding score of 80 points; the value falling within the interval [1.7, 1.8] is set as a caution value, with a corresponding score of 60 points; the value less than 1.7 is set as an abnormal value, with a corresponding score of 40 points; based on this, the scoring rule for the alkalinity index in the sinter ore quality index factor is determined;

[0037] The drum strength greater than 81% is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [80, 81]% is set as a caution value, and the corresponding value is 60 points; less than 80% is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the drum strength index in the sinter quality index factor is determined;

[0038] The low-temperature reduction pulverization rate is set to be less than 35% as a normal value, with a corresponding value of 80 points; the value falling within the interval [35, 40]% is a caution value, with a corresponding value of 60 points; and the value greater than 40% is an abnormal value, with a corresponding value of 40 points. Based on this, the scoring rule for the low-temperature reduction pulverization rate index in the sinter ore quality index factor is determined;

[0039] The average particle size greater than 20 mm is set as the normal value, and the corresponding value is 80 points; the value falling within the interval [18, 20] mm is set as the attention value, and the corresponding value is 60 points; the value less than 18 mm is set as the abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the average particle size index in the sintered ore quality index factor are determined.

[0040] Further,

[0041] The total iron content greater than 63.5% is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [63, 63.5]% is set as a caution value, and the corresponding value is 60 points; less than 63% is set as an abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the total iron content index in the pellet quality index factor is determined;

[0042] The compressive strength greater than 2400 is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [2200, 2400] is set as a cautionary value, and the corresponding value is 60 points; less than 2200 is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the compressive strength index in the pellet quality index factor is determined;

[0043] The expansion index less than 18% is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [18, 20]% is set as a caution value, and the corresponding value is 60 points; greater than 20% is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the expansion index indicator in the pellet quality index factor are determined.

[0044] Further,

[0045] The total iron content greater than 62.5% is set as a normal value, with a corresponding value of 80 points; the value falling within the interval [62, 62.5]% is set as a caution value, with a corresponding value of 60 points; less than 62% is set as an abnormal value, with a corresponding value of 40 points. Based on this, the scoring rule for the total iron content index in the lump ore quality index factor is determined;

[0046] The thermal cracking index is set to be less than 5 as a normal value, and falling within the interval [5, 6] as a caution value, with a corresponding value of 60 points; greater than 6 is an abnormal value, with a corresponding value of 40 points; based on this, the scoring rules for the thermal cracking index indicator in the lump ore quality index factor are determined.

[0047] Further,

[0048] The ash content less than 12% is set as the normal value, and the corresponding value is 80 points; the ash content falling into the interval [12, 12.5]% is set as the attention value, and the corresponding value is 60 points; greater than 12.5% ​​is set as the abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the ash content index in the coke quality index factor is determined;

[0049] The sulfur content less than 0.7% is set as the normal value, and the corresponding value is 80 points; the sulfur content falling within the interval [0.7, 0.75]% is set as the attention value, and the corresponding value is 60 points; greater than 0.75% is set as the abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the sulfur content index in the coke quality index factor is determined;

[0050] The average particle size greater than 52 mm is set as a normal value, with a corresponding score of 80 points; the value falling within the interval [50, 52] mm is set as a cautionary value, with a corresponding score of 60 points; and the value less than 50 mm is set as an abnormal value, with a corresponding score of 40 points. Based on this, the scoring rule for the average particle size index in the coke quality index factor is determined;

[0051] The post-reaction strength greater than 65% is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [62, 65]% is set as a caution value, and the corresponding value is 60 points; less than 62% is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the post-reaction strength index in the coke quality index factor is determined;

[0052] The reactivity less than 25% is set as the normal value, and the corresponding value is 80 points; the value falling within the interval [25, 28]% is set as the attention value, and the corresponding value is 60 points; the value greater than 28% is set as the abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the reactivity index in the coke quality index factor are determined.

[0053] Further,

[0054] The ash content less than 9% is set as the normal value, and the corresponding value is 80 points; the value falling within the interval [9, 10]% is set as the attention value, and the corresponding value is 60 points; greater than 10% is set as the abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the ash content index in the quality index factor of pulverized coal injection is determined;

[0055] The sulfur content less than 0.5% is set as the normal value, and the corresponding value is 80 points; the sulfur content falling into the interval [0.5, 0.6]% is set as the attention value, and the corresponding value is 60 points; greater than 0.6% is set as the abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the sulfur content index in the quality index factor of pulverized coal injection is determined;

[0056] The fixed carbon content greater than 76% is set as a normal value, with a corresponding value of 80 points; the value falling within the interval [74, 76]% is set as a cautionary value, with a corresponding value of 60 points; less than 74% is set as an abnormal value, with a corresponding value of 40 points; based on this, the scoring rule for the fixed carbon content index in the quality index factor of pulverized coal injection is determined;

[0057] The calorific value greater than 29500 is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [29000, 29500] is set as a caution value, and the corresponding value is 60 points; the value less than 29000 is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the calorific value index in the quality index factor of pulverized coal injection are determined.

[0058] Further,

[0059] It is set that the sinter slot position greater than 70% is a normal value, and the corresponding value is 80 points; the value falling within the interval [60, 70]% is a caution value, and the corresponding value is 60 points; less than 60% is an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the sinter slot index in the slot index factor is determined;

[0060] It is assumed that the pellet slot position greater than 70% is a normal value, with a corresponding value of 80 points; the value falling within the interval [40, 70]% is a caution value, with a corresponding value of 60 points; less than 40% is an abnormal value, with a corresponding value of 40 points; based on this, the scoring rule for the pellet slot index in the slot index factor is determined;

[0061] It is set that the block ore slot position greater than 70% is a normal value, and the corresponding value is 80 points; the value falling within the interval [40, 70]% is a caution value, and the corresponding value is 60 points; less than 40% is an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the block ore slot index in the slot index factor is determined;

[0062] It is set that the coke slot position greater than 70% is a normal value, and the corresponding value is 80 points; falling within the interval [60, 70]% is a caution value, and the corresponding value is 60 points; less than 60% is an abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the coke slot index in the slot index factor are determined.

[0063] Further,

[0064] The calculation and determination of the current raw material quality score index in step S4 is specifically as follows:

[0065] First, determine the weight of each indicator factor according to the proportion in the current raw material production data.

[0066] Then, according to the weights of each indicator factor and their respective scores, the sum of each indicator factor is calculated to determine the current raw material quality score index.

[0067] Further,

[0068] The “determine the weight of each indicator factor according to the proportion in the current raw material production data” is specifically:

[0069] First, set the weights of the sinter quality index factor, pellet quality index factor, lump quality index factor, coke quality index factor, pulverized coal injection quality index factor, and slot index factor;

[0070] Then, the weight of the sintered ore quality index factor is determined according to the product of the set weight of the sintered ore quality index factor and the sintering ratio;

[0071] The weight of the pellet quality index factor is determined according to the product of the set weight of the pellet quality index factor and the pellet ratio;

[0072] Determine the weight of the lump ore quality index factor according to the product of the set weight of the lump ore quality index factor and the lump ore ratio;

[0073] The weight of the coke quality index factor is determined according to the product of the set weight of the coke quality index factor and the total coke ratio / fuel ratio;

[0074] The weight of the pulverized coal injection quality index factor is determined according to the product of the set weight of the pulverized coal injection quality index factor and the coal ratio / fuel ratio;

[0075] Correspondingly, the weight of the slot index factor is directly determined by the set weight alone.

[0076] Further,

[0077] The setting weights of the sinter quality index factor, pellet quality index factor, lump quality index factor, coke quality index factor, and pulverized coal injection quality index factor are all 45%;

[0078] The setting weight of the slot index factor is 10%.

[0079] Further,

[0080] When any indicator in any indicator factor or multiple indicators in any indicator factor have abnormal scores, the system will issue a raw fuel abnormality alarm.

[0081] The present invention provides a method for evaluating and controlling the quality of raw materials entering a blast furnace. By periodically collecting blast furnace production data and quality information of materials entering the furnace, and combining the influencing factors of three dimensions, namely, the influence on the comprehensive grade of the furnace, the influence on the permeability of the blast furnace, and the influence on the quality of molten iron in the blast furnace, the index factors affecting the quality of raw materials are determined; then, the real-time score of each index factor is determined in combination with the set scoring rules, and finally, the real-time evaluation of the quality of raw materials is completed according to the real-time score of each index factor and their respective weights. The index factors are determined from three dimensions, namely, ore quality index, fuel quality, and slot position, and then combined with the specific quality information of materials entering the furnace, 7 index factors are finally established, and each index factor is composed of the index factors composed of its own index. The determination of the scoring rules for each index reflects an empirical innovation. When calculating the raw material quality score at the end, while following the raw material loading ratio in the blast furnace production data, the setting weights of each indicator factor are determined based on experience. The set weights are combined with the raw material loading ratio and their respective scores to finally complete the determination of the raw material quality score. On the whole, it reflects a lot of innovation based on accumulated experience, and also combines and reflects the application of numerical thinking in technological innovation. It is an innovation that combines experience and numerical thinking in practical analysis. Through the periodic collection, calculation, evaluation, and warning of the blast furnace raw material quality index, real-time monitoring of the blast furnace raw fuel quality is achieved, so that blast furnace operators can fully understand the blast furnace raw material quality and provide a reference for subsequent decision-making. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 It is a schematic diagram of the evaluation steps of the present invention;

[0083] Figure 2 Schematic diagram of blast furnace raw material quality scoring in an embodiment of the present invention. DETAILED DESCRIPTION

[0084] Below, a method for evaluating and controlling the quality of raw materials entering a blast furnace according to the accompanying drawings and specific implementation methods of the present invention is further described in detail.

[0085] This technical solution is a method for evaluating and controlling the quality of raw materials entering a blast furnace. The overall design idea and implementation process are as follows: Figure 1 , including the following steps:

[0086] S1: Periodically collect blast furnace production data and quality information of incoming materials, and determine the index factors affecting raw material quality by combining the influencing factors of the three dimensions of the comprehensive grade of incoming materials, the permeability of blast furnaces, and the quality of molten iron in blast furnaces;

[0087] S2: Determine the scoring rules for each indicator factor;

[0088] S3: Complete the specific scoring of each current indicator factor according to the determined scoring rules;

[0089] S4: Based on the scoring results of each indicator factor, calculate and determine the current raw material quality score index to complete the raw material quality evaluation.

[0090] A further specific setting idea is as follows: the index factor determined in step S1 is composed of an ore quality index factor, a fuel quality index factor and a slot index factor.

[0091] The ore quality index factors include: sintered ore quality index factor, pelletized ore quality index factor and lump ore quality index factor;

[0092] The fuel quality index factors include: coke quality index factor and pulverized coal injection quality index factor;

[0093] The slot index factors include: sintered ore slot index, pelletized ore slot index, lump ore slot index and coke slot index.

[0094] The sintered ore quality index factors are composed of six indexes: total iron content, ferrous iron content, basicity, drum strength, low-temperature reduction pulverization rate, and average particle size;

[0095] The pellet quality index factor is composed of three indexes: total iron content, compressive strength and expansion index;

[0096] The lump ore quality index factor is composed of two indexes: total iron content and thermal cracking index;

[0097] The coke quality index factor is composed of five indexes: ash content, sulfur content, average particle size, post-reaction strength and reactivity;

[0098] The quality index factor of the injected coal powder is composed of four indexes: ash content, sulfur content, fixed carbon content and calorific value.

[0099] By determining the scoring rules of each indicator in the sinter quality indicator factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the sinter quality indicator factor is determined;

[0100] By determining the scoring rules for each indicator in the pellet quality index factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the pellet quality index factor is determined;

[0101] By determining the scoring rules for each indicator in the lump ore quality indicator factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the lump ore quality indicator factor score is determined;

[0102] By determining the scoring rules of each indicator in the coke quality index factor, and according to the scoring rules and combining the average calculation of the real-time score values ​​of each indicator, the coke quality index factor score is determined;

[0103] By determining the scoring rules for each indicator in the pulverized coal injection quality index factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the pulverized coal injection quality index factor is determined;

[0104] The slot indicator factor score is determined by determining the scoring rules for each indicator in the slot indicator factor and calculating the average of the real-time score values ​​of each indicator based on the scoring rules.

[0105] In order to have a clearer understanding of this technical solution, the following is a detailed explanation of the specific working process and principle. The understanding of the following explanation can be combined with Figure 1 , 2 conduct.

[0106] A method for evaluating and controlling the quality of raw materials entering a blast furnace, the specific steps are as follows:

[0107] Step (1): Collect blast furnace production data and quality information of incoming materials. The blast furnace production data includes the weight and proportion information of the raw materials charged into the blast furnace; the incoming material quality information includes the chemical, physical, metallurgical properties and slot position of materials such as ore, coke, and pulverized coal injection;

[0108] Step (2): Determine the important raw materials and fuels that affect the production and operation of the blast furnace. The raw materials and fuels of the blast furnace can be divided into three types: fuel, ore and auxiliary materials, among which: fuel is divided into coke, pulverized coal injection or other injection materials. From the current domestic blast furnace production status, more than 98% of the fuel is mainly coke and pulverized coal injection; ore is divided into one, two or three of the three types of sintered ore, pelletized ore and lump ore; auxiliary materials are mainly silica, limestone and dolomite, etc. Silica is mainly used in daily production. The amount of auxiliary materials is about 8 kg per ton of iron, accounting for less than 0.5% of the proportion of blast furnace raw materials. Therefore, the quality of auxiliary materials may not be included in the raw material quality evaluation according to the situation; secondly, the blast furnace slot position has a great influence on the quality of the raw materials entering the furnace. When the slot position is low, the height difference of the added material increases, and the raw materials fall from the high place, resulting in an increase in the amount of crushing and pulverization. In addition, the discharge of the attached materials on the coke slot wall increases. At the same time, under the screening condition, the amount of powder entering the furnace increases, which affects the blast furnace condition. After screening, three parameters were obtained, namely ore quality, fuel quality and slot position.

[0109] Step (3): Determine the indicators to be included in the raw material and fuel evaluation. Select relevant parameters based on the important indicators of ore and fuel that affect the smooth operation of the blast furnace. In order to ensure the objectivity of the evaluation, the following aspects are selected: 1) Indicators that directly affect the comprehensive grade of the incoming furnace. The decline in the comprehensive grade of the incoming furnace and the increase in the amount of slag will increase the permeability and fuel consumption of the blast furnace, affecting the blast furnace capacity utilization rate; 2) Indicators that affect the permeability of the blast furnace: including raw material and fuel particle size and cold and hot strength indicators; 3) Indicators that directly or indirectly affect the quality of the molten iron in the blast furnace.

[0110] See Table 1 for details:

[0111] 1) Indicators that affect the comprehensive grade of the incoming furnace: total iron content of sintered ore, pellets and lump ore, coke and injection coal ash content, etc.;

[0112] 2) Indicators affecting blast furnace permeability: 5 indicators of sintered ore, including basicity, ferrous iron, TI, RDI and MS, 2 indicators of pelletized ore, including compressive strength and expansion index, thermal cracking index of lump ore, 3 indicators of coke, including MS, CSR and CRI, 2 indicators of pulverized coal injection, including fixed carbon and calorific value, and 4 indicators including slot position of sintered ore, pelletized ore, lump ore and coke, totaling 17 indicators.

[0113] 3) Direct or indirect indicators of blast furnace hot metal quality. Two indicators include sulfur in coke and pulverized coal injection.

[0114] The corresponding Chinese explanations for the above-mentioned English indicators are as follows:

[0115] R-alkalinity;

[0116] TI-drum strength, %;

[0117] RDI-low temperature reduction powder rate, %;

[0118] MS-mean particle size, mm;

[0119] CSR-post-reaction strength, %;

[0120] CRI - Reactivity, %.

[0121] Table 1 Evaluation index reference for various types of blast furnaces

[0122] Serial number Itemization Indicator 1 Indicator 2 Indicator 3 Indicator 4 Indicator 5 Indicator 6 1 Sintered ore Full Iron R Ferrous TI RDI MS 2 Pelletized Ore Full Iron Compressive strength Swelling Index 3 Lump Ore Full Iron Hot cracking index 4 Coke Ash Sulfur content MS CSR CRI 5 Pulverized Coal Injection Ash Sulfur content Fixed Carbon Calorific value 6 Slot Sintered ore Pellet Lump Ore Coke

[0123] Step (4): Setting the scoring range and score for each indicator. According to the enterprise technical requirements and expert experience, the control range of the indicator is controlled. When the indicator value is in the normal value area, the score is 80; when the indicator value is in the attention range, the score is 60; when the indicator value is in the abnormal value area, the score is 40. For details, see the specific scoring rules and corresponding specific score assignments pointed to by each table in Table 2.

[0124] Table 2 Standard ranges and scores of evaluation indicators for various types of blast furnaces 1) Standard ranges and scores of evaluation indicators for sintered ore

[0125]

[0126]

[0127] 2) Standard intervals and scores of pellet evaluation indicators

[0128]

[0129] 3) Standard intervals and scores for lump ore evaluation indicators

[0130]

[0131] 4) Standard range and score of coke index evaluation index

[0132]

[0133] 5) Standard range and score of evaluation index of pulverized coal injection

[0134]

[0135]

[0136] 6) Slot indicator evaluation index standard range and score

[0137]

[0138] Step (5): The weight distribution of each indicator of the same raw material variety can be averaged. For example, sintered ore has 6 indicators, and the weight of each indicator is 1 / 6 of the weight of sintered ore. Similarly, lump ore has 3 indicators, and the weight of each indicator is 1 / 3 of the weight of lump ore. The weights of other varieties of indicators are similar.

[0139] Step (6): Calculation of the quality index of raw material varieties. According to the methods described in steps (3), (4) and (5), the quality index of each variety is calculated using the calculation method shown in formula 1.

[0140]

[0141] j- represents the evaluation index of each variety, as shown in Table 1 and Table 2;

[0142] i- indicates the raw material varieties included in the quality evaluation. Please refer to Table 1.

[0143] Step (7): Setting the weight of product indicators.

[0144] 1) Raw material type weight setting: The weights of the three parameters of ore, coke and slot are set at 45%, 45% and 10% according to the empirical values.

[0145] 2) Ore is divided into three types: sintered ore, pellets and lump ore. The weights of each ore are allocated according to the charge structure. For example, if sintered ore accounts for 80% of the ore, the mass weight of the sintered ore is 80% of the total ore weight. For the raw material quality evaluation index, the mass weight of the sintered ore is 45% × 80%.

[0146] 3) The fuel weights are coke and pulverized coal injection. The fuel weights are allocated according to the proportion of each fuel. If the fuel ratio (i.e. the sum of the coke ratio and the coal ratio) is 495kg / t, the coke ratio is 300kg / t, and the coal ratio is 195kg / t, then the weight of coke in the fuel is: 300 / 495, and the weight of pulverized coal injection is 195 / 495. Relative to the total raw fuel mass, the weight of coke is: 45%×300 / 495=27.3%, and the weight of pulverized coal injection is: 45%×195 / 495=17.7%.

[0147] Step (8): Calculate the raw material quality index. According to the method described in step (6) and step (7), use the following formula:

[0148] The calculation method shown in Formula 2 is used to calculate the quality index of each variety.

[0149]

[0150] Where i is the raw material variety involved in the evaluation

[0151] Step (9): Raw material quality evaluation: Raw material quality evaluation is performed based on the raw material quality index calculated in step (4) and step (8), and can be performed according to the following rules.

[0152] 1) If the value of a certain indicator or multiple indicators falls within the "abnormal" range, regardless of whether the furnace condition smoothness index is greater than 60 points, the system will directly prompt "raw material abnormality". In operation, attention should be paid to such indicators and targeted measures should be taken to improve the smoothness of the blast furnace;

[0153] 2) Determine whether the blast furnace condition is smooth according to the raw material quality index. The raw material quality index is evaluated on a 100-point scale and is weighted at 100%, so the evaluation result is very intuitive. When the raw material quality index X is 80 points, it means that the furnace condition is good and all six parameters are in the normal range; when the furnace condition smooth index X is between 60 and 80 points, although all six parameters are in the normal and attention areas, the lower the score, the more the raw material quality deviates from the normal range, which should be of concern, and measures should be taken to improve smoothness if necessary.

[0154] Step (10): By periodically collecting, calculating, evaluating, and warning the blast furnace raw material quality index, real-time monitoring of the blast furnace raw fuel quality is achieved, so that the blast furnace operator can fully understand the blast furnace raw material quality for decision-making reference.

[0155] Example

[0156] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art.

[0157] Please refer to Table 4 and Figure 2 As shown, the quality of blast furnace raw materials is evaluated based on the charge structure, raw material quality indicators, slot information and fuel consumption of a large domestic blast furnace at a certain time.

[0158] (1) Data collection and transmission: According to production needs, the data collection system is used to collect blast furnace production operation parameters and equipment parameters, and transmit them to the information platform in real time; data can also be collected directly from the existing production management platform. See Table 3.

[0159] Table 3 Actual values ​​of blast furnace raw material quality

[0160]

[0161] Charge structure: sintered ore 75%, pellets 10% and lump ore 15%;

[0162] Fuel structure: fuel ratio is 492kg / t, of which coke ratio is 330kg / t and coal ratio is 162kg / t.

[0163] (2) Determine the score of each variety indicator by referring to the normal, concern and abnormal areas of each variety indicator, and calculate the evaluation score xi of each variety. See the tables in Table 4.

[0164] Table 4 Evaluation values ​​of evaluation indexes for each variety 1) Sintered ore quality evaluation

[0165]

[0166]

[0167] 2) Pellet quality evaluation

[0168]

[0169] 3) Lump ore quality evaluation

[0170]

[0171] 4) Coke quality evaluation

[0172]

[0173] 5) PCI quality evaluation

[0174]

[0175]

[0176] 6) Slot quality evaluation

[0177]

[0178] (3) Calculation of raw material quality index. The raw material quality index is calculated based on the quality evaluation index of each variety. See Table 5.

[0179] Table 5 Calculation of raw material quality index

[0180]

[0181] (4) Raw material quality evaluation.

[0182] 1) Check whether the indicators of each variety fall into the abnormal area, which is a 40-point evaluation item. If so, it will directly prompt "Raw material quality is abnormal" and prompt the name and value of the abnormal indicator; in this example, after checking, no variety indicator falls into the abnormal area, so proceed to the next step;

[0183] 2) The raw material quality index is 65.4 points, which falls into the range of [60,80) indicating "the raw material quality is average";

[0184] 3) Further analysis, select the raw materials with the lowest quality index among the 6 varieties, among which lump ore and PCI pulverized coal are both 60 points; remind to pay attention to "quality changes of lump ore and PCI"

[0185] (5) The program performs the next raw material quality index calculation cycle, updates the quality data and slot information of each raw material, and re-evaluates and prompts.

[0186] The beneficial effects of the present invention are as follows: by selecting raw materials such as ores and fuels used in blast furnaces, as well as slots that affect the quality of raw fuels, the quality of blast furnace raw fuels is evaluated, and weights are allocated according to empirical values ​​or regression methods. Because there are many raw fuel quality indicators, including physical, chemical, and metallurgical properties, this evaluation method selects evaluation indicators from aspects that affect blast furnace output, air permeability, and molten iron quality, sets weights according to the average division method, and calculates the blast furnace raw fuel quality index, which is used to characterize the degree to which blast furnace raw fuels meet production requirements. The beneficial results that can be obtained by the present invention are as follows:

[0187] (1) The present invention solves the problem that the existing raw material quality management model cannot evaluate the quality level of blast furnace raw materials as a whole, nor can it reflect the impact of the quality change of a certain type of blast furnace fuel or ore on the overall quality level of raw materials, and even more so cannot remind the operator to pay attention to the change of a certain type of quality and take timely measures to improve the furnace condition; the present invention calculates the blast furnace raw material quality index according to the latest composition of each type, and displays the unqualified indicators, so as to timely remind the blast furnace operator of the current raw material quality status; through the raw material index trend, the short-term trend of blast furnace raw material quality can be seen, so as to fully understand the change trend of blast furnace raw material quality.

[0188] (2) The present invention incorporates the blast furnace slot position into the raw fuel quality index evaluation for the first time. This reflects the impact of logistics guarantee on raw fuel quality, and also reflects the importance of the impact of low slot position on blast furnace production operation. Production practice shows that the impact of the low slot position of the blast furnace on the furnace condition is no less than the fluctuation of quality indicators, and should be included in the raw fuel quality management system for management.

[0189] (3) The present invention determines the weights between ore types according to the charge structure, and determines the weights between fuel types according to the fuel structure, which conforms to the actual situation that raw materials with large usage amounts have greater weights, and avoids falling into the trap of egalitarianism. When the ore or fuel structure is adjusted, the weights of each type also change accordingly, which is more in line with the actual situation.

[0190] (4) The present invention collects raw material data cyclically, periodically calculates the blast furnace raw material quality index, and performs real-time monitoring and evaluation on the blast furnace raw material quality.

Claims

1. A method for evaluating and controlling the quality of raw materials entering a blast furnace, characterized in that The steps include: S1: Periodically collect blast furnace production data and quality information of incoming materials, and determine the index factors affecting raw material quality by combining the influencing factors of the three dimensions of the comprehensive grade of incoming materials, the permeability of blast furnaces, and the quality of molten iron in blast furnaces; S2: Determine the scoring rules for each indicator factor; S3: Complete the specific scoring of each current indicator factor according to the determined scoring rules; S4: Based on the scoring results of each indicator factor, calculate and determine the current raw material quality score index to complete the raw material quality evaluation.

2. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 1, characterized in that: The index factors determined in step S1 are specifically: an ore quality index factor, a fuel quality index factor and a slot index factor.

3. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 2, characterized in that: The ore quality index factors include: sintered ore quality index factor, pelletized ore quality index factor and lump ore quality index factor; The fuel quality index factors include: coke quality index factor and pulverized coal injection quality index factor; The slot index factors include: sintered ore slot index, pelletized ore slot index, lump ore slot index and coke slot index.

4. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 3, characterized in that: The sintered ore quality index factors are composed of six indexes: total iron content, ferrous iron content, basicity, drum strength, low-temperature reduction pulverization rate, and average particle size; The pellet quality index factor is composed of three indexes: total iron content, compressive strength and expansion index; The lump ore quality index factor is composed of two indexes: total iron content and thermal cracking index; The coke quality index factor is composed of five indexes: ash content, sulfur content, average particle size, post-reaction strength and reactivity; The quality index factor of the injected coal powder is composed of four indexes: ash content, sulfur content, fixed carbon content and calorific value.

5. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 4, characterized in that: By determining the scoring rules of each indicator in the sinter quality indicator factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the sinter quality indicator factor is determined; By determining the scoring rules for each indicator in the pellet quality index factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the pellet quality index factor is determined; By determining the scoring rules for each indicator in the lump ore quality indicator factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the lump ore quality indicator factor score is determined; By determining the scoring rules of each indicator in the coke quality index factor, and according to the scoring rules and combining the average calculation of the real-time score values ​​of each indicator, the coke quality index factor score is determined; By determining the scoring rules for each indicator in the pulverized coal injection quality index factor, and according to the scoring rules and the average calculation of the real-time score values ​​of each indicator, the score of the pulverized coal injection quality index factor is determined; The slot indicator factor score is determined by determining the scoring rules for each indicator in the slot indicator factor and calculating the average of the real-time score values ​​of each indicator based on the scoring rules.

6. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 5, characterized in that: The total iron content greater than 57.5% is set as a normal value, with a corresponding value of 80 points; the value falling within the interval [57, 57.5]% is set as a caution value, with a corresponding value of 60 points; less than 57% is set as an abnormal value, with a corresponding value of 40 points. Based on this, the scoring rule for the total iron content index in the sinter ore quality index factor is determined; The ferrous content falling within the interval (7, 9)% is set as a normal value, and the corresponding value is 80 points; the ferrous content falling within the interval [6, 7]% or the interval [9, 10]% is set as a caution value, and the corresponding value is 60 points; less than 6% or greater than 10% is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the ferrous content index in the sintered ore quality index factor is determined; The alkalinity greater than 1.8 is set as a normal value, with a corresponding score of 80 points; the value falling within the interval [1.7, 1.8] is set as a caution value, with a corresponding score of 60 points; the value less than 1.7 is set as an abnormal value, with a corresponding score of 40 points; based on this, the scoring rule for the alkalinity index in the sinter ore quality index factor is determined; The drum strength greater than 81% is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [80, 81]% is set as a caution value, and the corresponding value is 60 points; less than 80% is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the drum strength index in the sinter quality index factor is determined; The low-temperature reduction powdering rate is set to be less than 35% as the normal value, and the corresponding value is 80 points; the value falling within the interval [35, 40]% is the attention value, and the corresponding value is 60 points; If the value is greater than 40%, it is considered an abnormal value and the corresponding value is 40 points. Based on this, the scoring rule for the low-temperature reduction pulverization rate index in the sintered ore quality index factor is determined; The average particle size greater than 20 mm is set as the normal value, and the corresponding value is 80 points; the value falling within the interval [18, 20] mm is set as the attention value, and the corresponding value is 60 points; the value less than 18 mm is set as the abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the average particle size index in the sintered ore quality index factor are determined.

7. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 5, characterized in that: The total iron content greater than 63.5% is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [63, 63.5]% is set as a caution value, and the corresponding value is 60 points; less than 63% is set as an abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the total iron content index in the pellet quality index factor is determined; The compressive strength greater than 2400 is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [2200, 2400] is set as a cautionary value, and the corresponding value is 60 points; less than 2200 is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the compressive strength index in the pellet quality index factor is determined; The expansion index less than 18% is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [18, 20]% is set as a caution value, and the corresponding value is 60 points; greater than 20% is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the expansion index indicator in the pellet quality index factor are determined.

8. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 5, characterized in that: The total iron content greater than 62.5% is set as a normal value, with a corresponding value of 80 points; the value falling within the interval [62, 62.5]% is set as a caution value, with a corresponding value of 60 points; less than 62% is set as an abnormal value, with a corresponding value of 40 points. Based on this, the scoring rule for the total iron content index in the lump ore quality index factor is determined; The thermal cracking index is set to be less than 5 as a normal value, and falling within the interval [5, 6] as a caution value, with a corresponding value of 60 points; greater than 6 is an abnormal value, with a corresponding value of 40 points; based on this, the scoring rules for the thermal cracking index indicator in the lump ore quality index factor are determined.

9. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 5, characterized in that: The ash content less than 12% is set as the normal value, and the corresponding value is 80 points; the ash content falling into the interval [12, 12.5]% is set as the attention value, and the corresponding value is 60 points; greater than 12.5% ​​is set as the abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the ash content index in the coke quality index factor is determined; The sulfur content less than 0.7% is set as the normal value, and the corresponding value is 80 points; the sulfur content falling within the interval [0.7, 0.75]% is set as the attention value, and the corresponding value is 60 points; greater than 0.75% is set as the abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the sulfur content index in the coke quality index factor is determined; The average particle size greater than 52 mm is set as a normal value, with a corresponding score of 80 points; the value falling within the interval [50, 52] mm is set as a cautionary value, with a corresponding score of 60 points; and the value less than 50 mm is set as an abnormal value, with a corresponding score of 40 points. Based on this, the scoring rule for the average particle size index in the coke quality index factor is determined; The post-reaction strength greater than 65% is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [62, 65]% is set as a caution value, and the corresponding value is 60 points; less than 62% is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the post-reaction strength index in the coke quality index factor is determined; The reactivity less than 25% is set as the normal value, and the corresponding value is 80 points; the value falling within the interval [25, 28]% is set as the attention value, and the corresponding value is 60 points; the value greater than 28% is set as the abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the reactivity index in the coke quality index factor are determined.

10. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 5, characterized in that: The ash content less than 9% is set as the normal value, and the corresponding value is 80 points; the value falling within the interval [9, 10]% is set as the attention value, and the corresponding value is 60 points; greater than 10% is set as the abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the ash content index in the quality index factor of pulverized coal injection is determined; The sulfur content less than 0.5% is set as the normal value, and the corresponding value is 80 points; the sulfur content falling into the interval [0.5, 0.6]% is set as the attention value, and the corresponding value is 60 points; greater than 0.6% is set as the abnormal value, and the corresponding value is 40 points. Based on this, the scoring rule for the sulfur content index in the quality index factor of pulverized coal injection is determined; The fixed carbon content greater than 76% is set as a normal value, with a corresponding value of 80 points; the value falling within the interval [74, 76]% is set as a cautionary value, with a corresponding value of 60 points; less than 74% is set as an abnormal value, with a corresponding value of 40 points; based on this, the scoring rule for the fixed carbon content index in the quality index factor of pulverized coal injection is determined; The calorific value greater than 29500 is set as a normal value, and the corresponding value is 80 points; the value falling within the interval [29000, 29500] is set as a caution value, and the corresponding value is 60 points; the value less than 29000 is set as an abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the calorific value index in the quality index factor of pulverized coal injection are determined.

11. A method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 5, characterized in that: It is set that the sinter slot position greater than 70% is a normal value, and the corresponding value is 80 points; the value falling within the interval [60, 70]% is a caution value, and the corresponding value is 60 points; less than 60% is an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the sinter slot index in the slot index factor is determined; The pellet slot position is set to be greater than 70% as the normal value, and the corresponding value is 80 points; the value falling within the interval [40, 70]% is the attention value, and the corresponding value is 60 points; Less than 40% is an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the pellet slot index in the slot index factor is determined; The block ore slot position is set to be greater than 70% as the normal value, and the corresponding value is 80 points; the block ore slot position is set to be within the interval [40, 70]% as the caution value, and the corresponding value is 60 points; Less than 40% is an abnormal value, and the corresponding value is 40 points; based on this, the scoring rule for the block ore slot index in the slot index factor is determined; It is set that the coke slot position greater than 70% is a normal value, and the corresponding value is 80 points; falling within the interval [60, 70]% is a caution value, and the corresponding value is 60 points; less than 60% is an abnormal value, and the corresponding value is 40 points; based on this, the scoring rules for the coke slot index in the slot index factor are determined.

12. A method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 3, characterized in that: The calculation and determination of the current raw material quality score index in step S4 is specifically as follows: First, determine the weight of each indicator factor according to the proportion in the current raw material production data. Then, according to the weights of each indicator factor and their respective scores, the sum of each indicator factor is calculated to determine the current raw material quality score index.

13. A method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 12, characterized in that: The "determining the weight of each indicator factor according to the proportion in the current raw material production data" is specifically: First, set the weights of the sinter quality index factor, pellet quality index factor, lump quality index factor, coke quality index factor, pulverized coal injection quality index factor, and slot index factor; Then, the weight of the sintered ore quality index factor is determined according to the product of the set weight of the sintered ore quality index factor and the sintering ratio; The weight of the pellet quality index factor is determined according to the product of the set weight of the pellet quality index factor and the pellet ratio; Determine the weight of the lump ore quality index factor according to the product of the set weight of the lump ore quality index factor and the lump ore ratio; The weight of the coke quality index factor is determined according to the product of the set weight of the coke quality index factor and the total coke ratio / fuel ratio; The weight of the pulverized coal injection quality index factor is determined according to the product of the set weight of the pulverized coal injection quality index factor and the coal ratio / fuel ratio; Correspondingly, the weight of the slot index factor is directly determined by the set weight alone.

14. A method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 13, characterized in that: The setting weights of the sinter quality index factor, pellet quality index factor, lump quality index factor, coke quality index factor, and pulverized coal injection quality index factor are all 45%; The setting weight of the slot index factor is 10%.

15. The method for evaluating and controlling the quality of raw materials entering a blast furnace according to claim 5, characterized in that: When any indicator in any indicator factor or multiple indicators in any indicator factor have abnormal scores, the system will issue a raw fuel abnormality alarm.

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