A method for using pulverized coal in a blast furnace

Abstract

The present application relates to the field of blast furnace alchemy technology and discloses a method for using blast furnace coal powder. The method comprises: obtaining a first type of coal powder, burning the first type of coal powder through a blast furnace; calculating a first effective value for the heat supply of the blast furnace tuyere raceway; calculating a second effective value for the heat supply of the blast furnace block belt; calculating a heat consumption value of the blast furnace slag-iron interface; calculating an evaluation value K of the first type of coal powder based on the first effective value, the second effective value, and the heat consumption value; obtaining multiple groups of coal powders of different types, and calculating the corresponding evaluation values K of the multiple groups of coal powders in turn; the blast furnace selects suitable coal powder for use based on the evaluation value K. The present application calculates the corresponding evaluation value K of different types of coal powders, evaluates the impact of coal powder on various areas of the blast furnace through the evaluation value K, and the purchasing personnel select the appropriate type of coal powder for purchase and use based on the evaluation value K.

Description

Technical Field

[0001] The present application relates to the technical field of blast furnace alchemy, and in particular, to a method for using blast furnace coal powder. Background Art

[0002] Pulverized coal for blast furnaces decomposes and burns in front of the blast furnace tuyere to produce CO, N2, and H2 gases. The gases further enter the upper area of the blast furnace to reduce iron ore. Part of the CO and H2 react to produce CO2 and H2O, and the ash and sulfur enter the slag to consume heat. In the past, the evaluation of pulverized coal focused on the overall effective calorific value, and the effective calorific value took into account the influence of gas utilization rate. Only the fixed effective calorific value and cost-effectiveness of different pulverized coals were evaluated.

[0003] However, even when two types of pulverized coal have the same effective calorific value, the heat released is distributed differently in different areas of the blast furnace. The secondary reaction of CO and H₂ in the lumpy zone has a greater impact on the blast furnace and, therefore, influences the operation direction of the blast furnace operator. Therefore, it is necessary to study the ratio of the calorific value of the lumpy zone to the total effective calorific value of pulverized coal in the blast furnace to better select the type of pulverized coal based on the characteristics of the blast furnace. Furthermore, for the same type of pulverized coal, the gas utilization rate varies in real time at different times. Therefore, it is necessary to adjust the gas utilization rate in conjunction with the effective calorific value of the pulverized coal to guide the blast furnace operator in adjusting the pulverized coal quantity in real time. Summary of the Invention

[0004] The purpose of this application is to provide a method for using blast furnace coal powder, calculate the corresponding evaluation value K of different types of coal powder, evaluate the impact of coal powder on various areas of the blast furnace through the evaluation value K, and select the appropriate type of coal powder for purchase and use based on the evaluation value K.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0006] According to one aspect of an embodiment of the present application, a method for using blast furnace coal powder is provided, the method comprising: obtaining a first type of coal powder, and burning the first type of coal powder through a blast furnace; calculating a first effective value of heat supply in the blast furnace tuyere vortex zone; calculating a second effective value of heat supply in the blast furnace block belt; calculating a heat consumption value of the blast furnace slag-iron interface; calculating an evaluation value K of the first type of coal powder based on the first effective value, the second effective value and the heat consumption value; obtaining multiple groups of coal powders of different types, and calculating the corresponding evaluation values K of the multiple groups of coal powders in turn; the blast furnace selects suitable coal powder for use based on the evaluation value K.

[0007] In some embodiments, in the calculation to obtain the first effective value of the heating supply to the blast furnace tuyere vortex zone, the method also includes: calculating the heat consumption of compound decomposition in the first type of coal powder; calculating the heat release of incomplete combustion of carbon in the first type of coal powder; calculating the heat consumption of water-gas reaction in the first type of coal powder; and calculating the first effective value of the heating supply to the blast furnace tuyere vortex zone based on the heat consumption of compound decomposition, heat release of incomplete combustion of carbon and heat consumption of water-gas reaction.

[0008] In some embodiments, in calculating the first effective value of the heating supply to the blast furnace tuyere raceway according to the heat consumption of compound decomposition, heat release of incomplete carbon combustion, and heat consumption of water-gas reaction, the following formula is used to calculate the first effective value:

[0009]

[0010] Among them, Q t is the first effective value, Q f is the heat consumed by the decomposition of the compound, Q C The heat released by incomplete combustion of carbon, Q H2O The heat consumed by the water-gas reaction.

[0011] In some embodiments, in calculating the second effective value of the heat supply of the blast furnace block strip, the method also includes: calculating the CO combustion heat release after the CO generated by incomplete combustion of carbon leaves the blast furnace tuyere vortex zone; calculating the H2 combustion heat release in the first type of coal powder; experimentally obtaining the CO utilization rate and the H2 utilization rate; and calculating the second effective value of the heat supply of the blast furnace block strip based on the CO combustion heat release, H2 combustion heat release, CO utilization rate and H2 utilization rate.

[0012] In some embodiments, in calculating the second effective value of the blast furnace block strip heat supply based on the CO combustion heat release, H2 combustion heat release, CO utilization rate, and H2 utilization rate, the second effective value is calculated using the following formula:

[0013]

[0014] Among them, Q p is the second effective value, Q CO,i is the heat released by CO combustion, η CO is the CO utilization rate, The heat released by the combustion of H2 is the H2 utilization rate.

[0015] In some embodiments, in calculating the heat consumption value of the blast furnace slag-iron interface, the method includes: calculating the sensible heat of the ash in the first type of coal powder; calculating the phase change enthalpy and melting enthalpy generated when the ash in the first type of coal powder is heated from the coal powder carrier gas temperature to the slag temperature; calculating the heat brought out by the ash in the first type of coal powder to form slag based on the sensible heat, phase change enthalpy and melting enthalpy of the ash; calculating the desulfurization heat in the first type of coal powder; calculating the heat consumption value of the blast furnace slag-iron interface based on the heat brought out by the ash to form slag and the desulfurization heat.

[0016] In some embodiments, the heat consumption value of the blast furnace slag-iron interface is calculated based on the heat brought out by the ash-forming slag and the desulfurization heat consumption, and the following formula is used for calculation:

[0017] Q O =Q A +Q S ;

[0018] Among them, Q O is the heat consumption value; Q A To remove heat from ash to form slag; Q S Heat is consumed for desulfurization.

[0019] In some embodiments, in calculating the evaluation value K of the first type of pulverized coal based on the first effective value, the second effective value, and the heat consumption value, the evaluation value K is calculated using the following formula:

[0020]

[0021] Among them, Q p is the second effective value, Q t is the first effective value, Q O The heat consumption value.

[0022] In some embodiments, after the blast furnace selects suitable pulverized coal for use based on the evaluation value K, the method further includes: calculating a dynamic effective calorific value based on the first effective value, the second effective value and the heat consumption value; and adjusting the pulverized coal injection amount in real time based on the dynamic effective calorific value to ensure the dynamic balance of heat in the blast furnace.

[0023] In some embodiments, in calculating the dynamic effective calorific value based on the first effective value, the second effective value, and the heat consumption value, the dynamic effective calorific value is calculated using the following formula:

[0024] Q e =Q t +Q p -Q O ;

[0025] Among them, Q e is the dynamic effective calorific value, Q t is the first effective value, Qp is the second effective value, Q O The heat consumption value.

[0026] The technical solution of the present application, as described above, has significant beneficial effects compared to the prior art in that it calculates the corresponding evaluation value K for different types of pulverized coal, evaluates the impact of the pulverized coal on various areas of the blast furnace through the evaluation value K, and effectively guides purchasing personnel in the selection of pulverized coal. The evaluation value K is selected based on the blast furnace being used, and the appropriate type of pulverized coal is selected for purchase and use based on the evaluation value K. In addition, for the same pulverized coal, the calorific value also changes with changes in gas utilization. The dynamic effective calorific value of the pulverized coal is calculated, and the blast furnace operation is guided in real time based on the dynamic effective calorific value, adjusting the pulverized coal injection rate, effectively ensuring the heat balance of the blast furnace.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0029] Figure 1 A flow chart according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0031] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0032] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0033] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0034] The technical solutions of the embodiments of the present application are briefly described below:

[0035] According to some embodiments, Figure 1 As shown, the present application provides a method for using blast furnace coal powder, the method comprising:

[0036] Step 101: obtaining a first type of pulverized coal, and burning the first type of pulverized coal in a blast furnace;

[0037] Step 102, calculating and obtaining a first effective value of heat supply to the blast furnace tuyere raceway;

[0038] Step 103, calculating and obtaining a second effective value of the heat supply of the blast furnace block strip;

[0039] Step 104, calculating and obtaining the heat consumption value of the blast furnace slag-iron interface;

[0040] Step 105, calculating the evaluation value K of the first type of pulverized coal according to the first effective value, the second effective value and the heat consumption value;

[0041] Step 106: obtaining multiple groups of different types of pulverized coal, and sequentially calculating the corresponding evaluation values K for the multiple groups of pulverized coal;

[0042] Step 107: The blast furnace selects suitable pulverized coal for use according to the evaluation value K.

[0043] Based on the above embodiment, the evaluation value K corresponding to different types of coal powder is calculated, and the evaluation value K corresponding to each type of coal powder is marked. The evaluation value K is used to evaluate the impact of coal powder on various areas of the blast furnace, which effectively guides purchasing personnel in the purchase of coal powder. The evaluation value K suitable for the blast furnace is selected according to the blast furnace used, and the appropriate type of coal powder is selected for purchase and use based on the evaluation value K, so as to improve the utilization rate of coal powder.

[0044] In order to make those skilled in the art better understand this application, Figure 1 The details of this application are described in detail.

[0045] According to some embodiments, in step 102, in calculating and obtaining a first effective value of heat supply to the blast furnace tuyere raceway, the method further includes:

[0046] Step 1021, calculating and obtaining the heat consumption of decomposition of compounds in the first type of coal powder;

[0047] Step 1022, calculating and obtaining heat release due to incomplete combustion of carbon in the first type of pulverized coal;

[0048] Step 1023, calculating and obtaining the heat consumption of the water-gas reaction in the first type of pulverized coal;

[0049] Step 1024 , calculating a first effective value of heating in the blast furnace tuyere raceway according to the heat consumption of compound decomposition, heat release of incomplete carbon combustion and heat consumption of water-gas reaction.

[0050] Based on the above example, the heat consumption due to compound decomposition, the heat released by incomplete carbon combustion, and the heat consumption due to the water-gas reaction are calculated based on the mass of the pulverized coal and the percentage of compound content, carbon content, and water-gas content in the pulverized coal. Finally, the first effective value of the heating supply to the blast furnace tuyere raceway is calculated based on the heat consumption due to compound decomposition, the heat released by incomplete carbon combustion, and the heat consumption due to the water-gas reaction.

[0051] Furthermore, in step 1024, a first effective value of heating in the blast furnace tuyere raceway is calculated based on the heat consumption of compound decomposition, heat release of incomplete carbon combustion, and heat consumption of water-gas reaction. The first effective value is calculated using the following formula:

[0052]

[0053] Among them, Q t is the first effective value, Q f is the heat consumed by the decomposition of the compound, Q C The heat released by incomplete combustion of carbon. The heat consumed by the water-gas reaction.

[0054] Further deducing the formula, we can get:

[0055]

[0056] Among them, the low calorific value of pulverized coal injection (Q net.ar ) is measured according to national standards; Q total The heat released by the complete combustion of the decomposition products, that is, the heat released after the complete combustion of the C and H elements in the pulverized coal, is calculated using the following formula: total :

[0057]

[0058] Among them, Q C,f Q is the heat released when all carbon is burned to generate CO in the vortex zone of the tuyere. C =Q C,f , Q CO,f is the heat released by the complete combustion of CO, The heat released by the complete combustion of hydrogen.

[0059] According to some embodiments, in step 103, in calculating and obtaining a second effective value of heat supply from the blast furnace lump strip, the method further includes:

[0060] Step 1031, calculating and obtaining the heat released by the combustion of CO generated by incomplete combustion of carbon after leaving the blast furnace tuyere raceway;

[0061] Step 1032, calculating and obtaining the heat released by the combustion of H2 in the first type of pulverized coal;

[0062] Step 1033, obtaining CO utilization rate and H2 utilization rate through testing;

[0063] Step 1034: Calculate the second effective value of the blast furnace block strip heat supply based on the CO combustion heat release, H2 combustion heat release, CO utilization rate, and H2 utilization rate.

[0064] Based on the above embodiment, in step 1034, the second effective value of the blast furnace block strip heat supply is calculated based on the CO combustion heat release, H2 combustion heat release, CO utilization rate, and H2 utilization rate. The second effective value is calculated using the following formula:

[0065]

[0066] Among them, Q p is the second effective value, Q CO,i is the heat released by CO combustion, η CO is the CO utilization rate, The heat released by the combustion of H2 is the H2 utilization rate.

[0067] According to some embodiments, in step 104, in calculating and obtaining the heat consumption value of the blast furnace slag-iron interface, the method includes:

[0068] Step 1041, calculating and obtaining the sensible heat of ash in the first type of pulverized coal;

[0069] Step 1042, calculating and obtaining the phase change enthalpy and melting enthalpy of the ash in the first type of pulverized coal when heated from the pulverized coal carrier gas temperature to the slag temperature;

[0070] Step 1043, calculating and obtaining the heat carried away by the ash in the first type of pulverized coal to form slag based on the sensible heat of the ash, the phase change enthalpy, and the melting enthalpy;

[0071] Step 1044, calculating and obtaining the desulfurization heat consumption in the first type of pulverized coal;

[0072] Step 1045: Calculate the heat consumption value of the blast furnace slag-iron interface based on the heat brought out by the ash-formed slag and the desulfurization heat consumption.

[0073] Based on the above embodiment, in step 1045, the heat consumption value of the blast furnace slag-iron interface is calculated based on the heat brought out by the ash forming slag and the desulfurization heat consumption, and the following formula is used for calculation:

[0074] Q O =Q A +Q S ;

[0075] Among them, Q O is the heat consumption value; Q A To remove heat from ash to form slag; Q S Heat is consumed for desulfurization.

[0076] According to some embodiments, in step 105, the evaluation value K of the first type of pulverized coal is calculated based on the first effective value, the second effective value, and the heat consumption value. The evaluation value K is calculated using the following formula:

[0077]

[0078] Among them, Q p is the second effective value, Q t is the first effective value, Q O The heat consumption value.

[0079] Comparing and analyzing the K values of different pulverized coals quantitatively evaluates the difference in heat release between the tuyere raceway and non-tuyere raceway zones after the injected coals enter the blast furnace. A larger K value indicates a higher impact on blast furnace fuel consumption and thermal hysteresis, as well as a greater impact on blast furnace operation and the middle and upper sections. A smaller K value indicates a greater impact on the theoretical combustion temperature of the tuyere raceway zone, and a greater impact on the lower section and air pressure. The K value can be used to determine whether a particular pulverized coal is suitable for blast furnace conditions, thus guiding coal selection.

[0080] According to some embodiments, after the blast furnace selects suitable pulverized coal for use according to the evaluation value K in step 107, the method further includes:

[0081] Step 108, calculating a dynamic effective calorific value based on the first effective value, the second effective value, and the heat consumption value;

[0082] Step 109: adjusting the pulverized coal injection rate in real time according to the dynamic effective calorific value to ensure the dynamic heat balance of the blast furnace.

[0083] Based on the above embodiment, in step 108, the dynamic effective calorific value is calculated according to the first effective value, the second effective value and the heat consumption value, and the dynamic effective calorific value is calculated using the following formula:

[0084] Q e =Q t +Q p -Q O ;

[0085] Among them, Q e is the dynamic effective calorific value, Q t is the first effective value, Q p is the second effective value, Q O The heat consumption value.

[0086] For the same pulverized coal, a higher dynamic effective calorific value indicates greater overall heat contribution to the blast furnace, while a lower dynamic effective calorific value indicates less overall heat contribution. This allows for identification of differences in the effective calorific value of different pulverized coals under the same furnace conditions. As gas utilization changes, the calorific value also changes. By calculating the dynamic effective calorific value of the pulverized coal, this value can be used to guide blast furnace operations in real time and adjust the pulverized coal injection rate, effectively ensuring thermal balance in the blast furnace and preventing overheating or overheating.

[0087] Specifically, in some embodiments, taking a 4,000 cubic meter blast furnace as an example, two types of pulverized coal are available. The CO utilization rate is 50%, and the H2 utilization rate is 40%. The effective calorific value Qe and the K value of the pulverized coal are calculated. The sulfur in this blast furnace pulverized coal accounts for 88.08% of the molten iron and 11.92% of the slag.

[0088] Table 1 Composition of pulverized coal on an air-dried basis

[0089]

[0090] Table 2 Ash composition of pulverized coal

[0091]

[0092] Table 3 Calculation results of calorific value of each region of pulverized coal (kJ / kg pulverized coal)

[0093]

[0094] (1) Effective calorific value Qe, pulverized coal 1 < pulverized coal 2. Pulverized coal 2 can release more effective heat. If the blast furnace does not consider regional requirements, pulverized coal 2 can be selected, which has a higher calorific value. If the blast furnace has requirements for regional heat release, it can be further judged by the K value.

[0095] (2) K value: Pulverized coal 1 < Pulverized coal 2, indicating that Pulverized coal 1 releases more heat to the tuyere vortex zone and less heat to the massive zone. Pulverized coal 2 releases less heat to the tuyere vortex zone and more heat to the massive zone.

[0096] The theoretical combustion temperature of the 4000 cubic meter blast furnace tuyere raceway is already very high, so pulverized coal 2 can be selected at this time; if the theoretical combustion temperature of the 4000 cubic meter blast furnace tuyere raceway is low, the demand for block bands is small, and more heat is required, pulverized coal 1 can be selected.

[0097] (3) For pulverized coal 2, it can be analyzed that the total calorific value of the same pulverized coal changes with the change of gas utilization rate. According to the dynamic calorific value Qe, the CO utilization rate is 48%, the H2 utilization rate is 38.4%, Qe = 16951.11 kJ / kg, and the heat demand remains unchanged. At this time, the pulverized coal is adjusted to 17435.27 / 16951.11 = 1.0286 times the benchmark value. Based on the pulverized coal injection rate of 70 / h, it needs to be adjusted to 71.99 / h to meet the heat demand of the blast furnace, which guides the operator to adjust the pulverized coal amount.

[0098] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0099] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for using blast furnace coal powder, characterized in that: The method comprises: obtaining a first type of pulverized coal, and burning the first type of pulverized coal in a blast furnace; Calculate and obtain the first effective value of heating in the blast furnace tuyere raceway; Calculate and obtain the second effective value of blast furnace block belt heating; Calculate and obtain the heat consumption value of the blast furnace slag-iron interface; Calculate the evaluation value K of the first type of pulverized coal according to the first effective value, the second effective value and the heat consumption value; Obtain multiple groups of coal powder of different types, and calculate the corresponding evaluation values K of the multiple groups of coal powder in sequence; The blast furnace selects suitable pulverized coal for use according to the evaluation value K; In calculating the evaluation value K of the first type of pulverized coal based on the first effective value, the second effective value, and the heat consumption value, the evaluation value K is calculated using the following formula: Among them, Q p is the second effective value, Q t is the first effective value, Q O is the heat consumption value; Among them, the larger the K value, the higher the impact of this type of coal powder on the blast furnace fuel consumption and thermal hysteresis, and the greater the impact on the blast furnace operation and the middle and upper parts; the smaller the K value, the greater the impact of this type of coal powder on the theoretical combustion temperature of the tuyere swirl zone, and the greater the impact on the lower part of the blast furnace and the wind pressure.

2. The method according to claim 1, characterized in that In the step of calculating and obtaining the first effective value of heat supply to the blast furnace tuyere raceway, the method further comprises: Calculate and obtain the heat consumption for decomposition of compounds in the first type of coal powder; Calculate the heat released by incomplete combustion of carbon in the first type of coal powder; Calculate and obtain the heat consumption of water-gas reaction in the first type of pulverized coal; The first effective value of heating in the blast furnace tuyere raceway is calculated based on the heat consumption of compound decomposition, heat release of incomplete carbon combustion and heat consumption of water-gas reaction.

3. The method according to claim 2, characterized in that In calculating the first effective value of the heating of the blast furnace tuyere raceway according to the heat consumption of compound decomposition, heat release of incomplete carbon combustion and heat consumption of water-gas reaction, the following formula is used to calculate the first effective value: Among them, Q t is the first effective value, Q f is the heat consumed by the decomposition of the compound, Q C The incomplete combustion of carbon releases heat. The heat consumed by the water-gas reaction.

4. The method according to claim 1, wherein In calculating and obtaining the second effective value of the heat supply of the blast furnace block strip, the method further includes: Calculate the heat released by CO combustion after the CO generated by incomplete carbon combustion leaves the blast furnace tuyere raceway; Calculate the heat release of H2 combustion in the first type of pulverized coal; The CO utilization rate and H2 utilization rate are obtained through experiments; The second effective value of the blast furnace block strip heat supply is calculated based on the CO combustion heat release, H2 combustion heat release, CO utilization rate and H2 utilization rate.

5. The method according to claim 4, characterized in that In calculating the second effective value of the blast furnace block strip heat supply based on the CO combustion heat release, H2 combustion heat release, CO utilization rate, and H2 utilization rate, the following formula is used to calculate the second effective value: Among them, Q p is the second effective value, Q CO,i is the heat released by CO combustion, η CO is the CO utilization rate, The heat released by the combustion of H2 is the H2 utilization rate.

6. The method according to claim 1, characterized in that In calculating and obtaining the heat consumption value of the blast furnace slag-iron interface, the method includes: Calculate and obtain the sensible heat of ash in the first type of pulverized coal; Calculate and obtain the phase change enthalpy and melting enthalpy of the ash in the first type of pulverized coal when heated from the pulverized coal carrier gas temperature to the slag temperature; Calculating the heat brought out by ash in the first type of coal powder to form slag based on the sensible heat, phase change enthalpy and melting enthalpy of the ash; Calculate and obtain the desulfurization heat consumption in the first type of pulverized coal; The heat consumption value of the blast furnace slag-iron interface is calculated based on the heat brought out by the ash forming slag and the desulfurization heat consumption.

7. The method according to claim 6, characterized in that In calculating the heat consumption value of the blast furnace slag-iron interface based on the heat brought out by the ash forming slag and the desulfurization heat consumption, the following formula is used: Q O =Q A +Q S ; Among them, Q O is the heat consumption value; Q A To remove heat from ash to form slag; Q S Heat is consumed for desulfurization.

8. The method according to claim 1, characterized in that After the blast furnace selects suitable pulverized coal for use according to the evaluation value K, the method further includes: Calculating a dynamic effective calorific value based on the first effective value, the second effective value and the heat consumption value; The pulverized coal injection rate is adjusted in real time according to the dynamic effective calorific value to ensure the dynamic balance of heat in the blast furnace.

9. The method according to claim 8, characterized in that In calculating the dynamic effective calorific value based on the first effective value, the second effective value, and the heat consumption value, the following formula is used to calculate the dynamic effective calorific value: Q e =Q t +Q p -Q O ; Among them, Q e is the dynamic effective calorific value, Q t is the first effective value, Q p is the second effective value, Q O The heat consumption value.

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