Method and device for determining smelting thermal parameters of blast furnace

Abstract

The invention discloses a method and device for determining blast furnace smelting thermal parameters, and belongs to the technical field of blast furnace smelting. The method comprises the following steps: in a blast furnace smelting process based on a reducing gas injection process, acquiring blast parameters and injection parameters, acquiring component contents of pulverized coal and gas components of reducing gas, and determining the component contents and the gas components as material parameters; according to the blast parameters, the injection parameters and the material parameters, the flow of bosh gas generated in a reaction in a tuyere convolute area of the smelting furnace is calculated; according to the blast parameters, the injection parameters, the material parameters and coke parameters in the tuyere rotation area, the input enthalpy value of the tuyere rotation area is calculated; and determining the theoretical combustion temperature of the tuyere according to the input enthalpy value and the flow of bosh gas. The method can adapt to novel process conditions and complex furnace conditions such as hydrogen-rich injection and hydrogen-rich carbon circulation oxygen blast furnaces, and dynamic and accurate evaluation of the theoretical combustion temperature of the tuyere is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of blast furnace smelting, and particularly relates to a method and device for determining a thermal parameter of blast furnace smelting. BACKGROUND

[0002] Under the blast furnace smelting scene, the auxiliary fuel sprayed from the tuyere is combusted with the hot blast and the coke in the raceway to generate high-temperature coal gas, which provides the required heat and reducing gas for the reduction of iron ore, and can effectively reduce coke consumption and carbon emissions. In this process, the tuyere theoretical combustion temperature, as an important parameter for measuring the thermal state of the blast furnace hearth, will affect the heat transfer efficiency of the furnace charge, the reduction reaction rate, and the key process of slag iron generation and composition control.

[0003] At present, an empirical formula based on ideal working conditions is generally used to estimate the tuyere theoretical combustion temperature, but this method cannot accurately reflect the actual combustion state under new process conditions such as hydrogen-rich injection, hydrogen-rich carbon cycle oxygen blast furnace operation, and special furnace conditions, resulting in large deviations in the calculation results and limiting its application in modern blast furnace process control and optimization.

[0004] Therefore, how to design a method suitable for complex conditions and capable of accurately determining the tuyere theoretical combustion temperature has become a technical problem to be solved at present. SUMMARY

[0005] The embodiments of the application provide a method, device and equipment for determining a thermal parameter of blast furnace smelting, and a computer storage medium, which can accurately determine the tuyere theoretical combustion temperature to improve the intelligent and fine level of the blast furnace smelting process.

[0006] In a first aspect, the embodiments of the application provide a method for determining a thermal parameter of blast furnace smelting, which comprises the following steps:

[0007] In the blast furnace smelting process based on the reduction gas injection process, the blast parameters and the injection parameters are obtained, the blast parameters are parameters representing the working condition state of the hot blast blown into the smelting furnace, and the injection parameters are parameters representing the working condition state of the pulverized coal and the reduction gas injected into the smelting furnace;

[0008] The component content of the pulverized coal and the gas component of the reduction gas are obtained to determine the material parameters;

[0009] The flow rate of the bosh gas generated in the raceway of the tuyere of the smelting furnace is calculated according to the blast parameters, the injection parameters and the material parameters;

[0010] The input enthalpy value of the raceway of the tuyere is calculated according to the blast parameters, the injection parameters, the material parameters and the coke parameters in the raceway of the tuyere;

[0011] The tuyere theoretical combustion temperature is determined according to the input enthalpy value and the flow rate of the bosh gas.

[0012] In a second aspect, the embodiments of the present application provide a device for determining a thermal parameter of blast furnace smelting, the device comprising:

[0013] a first collecting module configured to acquire blast parameters and injection parameters in a blast furnace smelting process based on a reduction gas injection process, the blast parameters being parameters representing a working condition of hot blast blown into a smelting furnace, and the injection parameters being parameters representing a working condition of coal powder and reduction gas injected into the smelting furnace;

[0014] a second collecting module configured to acquire ingredient content of the coal powder and gas components of the reduction gas, and determine the ingredient content as a substance parameter;

[0015] a flow determining module configured to calculate a flow of a bosh gas generated in a tuyere rotation zone of the smelting furnace according to the blast parameters, the injection parameters and the substance parameter;

[0016] an enthalpy value determining module configured to calculate an input enthalpy value of the tuyere rotation zone according to the blast parameters, the injection parameters, the substance parameter and a coke parameter in the tuyere rotation zone;

[0017] a calculating module configured to determine a tuyere theoretical combustion temperature according to the input enthalpy value and the flow of the bosh gas.

[0018] In a third aspect, the embodiments of the present application provide an electronic device, the device comprising: a processor, and a memory storing computer program instructions; the processor reads and executes the computer program instructions to implement the method of any one of the first aspect.

[0019] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, the computer readable storage medium storing computer program instructions, the computer program instructions being executed by a processor to implement the method of any one of the first aspect.

[0020] In a fifth aspect, the embodiments of the present application provide a computer program product, the computer program product containing a computer program, the computer program being executed by a processor to implement the method of any one of the first aspect.

[0021] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0022] The method for determining the thermal parameters of blast furnace smelting provided in the embodiment of the present application combines blast parameters, injection parameters, coal powder composition, reducing gas components and coke parameters, and accurately calculates the flow rate of the furnace gas generated by the reaction in the tuyere vortex zone and the system input enthalpy value based on the energy-mass balance theory, thereby determining the theoretical combustion temperature of the tuyere. Compared with the traditional calculation method that relies on empirical formulas, this method can adapt to new process conditions such as hydrogen-rich injection and complex furnace conditions, and realize dynamic and accurate evaluation of the theoretical combustion temperature of the tuyere, providing a reliable basis for blast furnace thermal state monitoring and operation optimization, and improving the stability and energy utilization efficiency of the ironmaking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction to the drawings required for use in the embodiments of the present application is given below.

[0024] Figure 1 This is a schematic diagram of an application scenario of a method for determining thermal parameters of blast furnace smelting provided in an embodiment of the present application;

[0025] Figure 2 This is a flow chart of a method for determining thermal parameters of blast furnace smelting provided in an embodiment of the present application;

[0026] Figure 3 This is a schematic structural diagram of a device for determining thermal parameters of blast furnace smelting provided in an embodiment of the present application;

[0027] Figure 4 This is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make those of ordinary skill in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and in the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples consistent with some aspects of the present application as detailed in the appended claims.

[0030] As described in the background section, in the blast furnace smelting process, the auxiliary fuel injected into the blast furnace tuyere is burned together with hot blast and coke in the raceway to produce high-temperature coal gas, which provides the necessary heat and reducing gas for iron ore, and can effectively reduce the coke consumption of the blast furnace. As an important input of the blast furnace, the tuyere of the hearth directly affects the supply of heat and reducing gas in the furnace, and plays a key role in the overall thermal state of the blast furnace. In recent years, in order to achieve the goal of carbon emission reduction, new tuyere operation processes such as hydrogen-rich injection have been gradually applied in blast furnace production. For example, by injecting low-carbon fuels such as coke oven gas, natural gas or hydrogen through the tuyere, although it helps to reduce carbon emissions, it also significantly changes the thermal state and operating conditions in the furnace, and puts higher requirements on the original thermal parameter calculation method.

[0031] The theoretical combustion temperature (T f ) of the tuyere refers to the temperature that can be reached by the combustion products when the fuel in the raceway is incompletely burned under adiabatic conditions, and the physical heat brought in by the fuel and blast and the heat released by the combustion reaction are all transferred to the combustion products. This temperature has a great influence on the heat transfer of the furnace burden, the reduction reaction, slagging, desulfurization, and the temperature and chemical composition of slag and iron, and is therefore widely used in the thermal state evaluation and production operation guidance of the blast furnace smelting process.

[0032] However, the current industry generally uses empirical formulas based on idealized assumptions to estimate the theoretical combustion temperature of the tuyere. This type of method does not fully consider the changes in the type of injected gas, the fluctuations in fuel composition, and the non-ideal combustion behavior under complex furnace conditions, and is difficult to apply to new processes such as hydrogen-rich injection. There are problems of poor adaptability and insufficient accuracy.

[0033] To solve this technical problem, the embodiments of the present application provide a method and device for determining the thermal parameters of blast furnace smelting, which are suitable for determining the thermal parameters of blast furnace smelting under different injection conditions, for more accurately calculating the theoretical combustion temperature of the tuyere, and for improving the process control and energy saving and carbon reduction level of the blast furnace.

[0034] The method for determining the thermal parameters of blast furnace smelting provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings and through specific embodiments.

[0035] Figure 1 An application scenario diagram of a determination method of a blast furnace smelting thermal parameter is shown.

[0036] Based on Figure 1 , it should be noted that the method described in the embodiments of the present application is applicable to the operation conditions of blast furnace tuyere injection of hydrogen-rich gas, metallurgical by-product gas and other reducing gases.

[0037] From Figure 1 , it can be seen that hot air enters the hearth through the tuyere, and the coal powder injected through the coal gun and the reducing gas (such as hydrogen-rich gas, metallurgical by-product gas, etc.) sent through the straight blow pipe occur combustion reaction in the whirl area. During the combustion process, high-temperature coke participates in the reaction to generate high-temperature combustion products (CO, H2, N2, etc.), and a whirl flow area is formed in the red dashed line area marked in the figure. The combustion reaction in this area is intense, which is the key position to form the theoretical combustion temperature (T f ) of the tuyere. At the same time, the residual carbon particles and the unreacted fuel are deposited to the lower part of the hearth.

[0038] The method of the present application is applied to the blast furnace tuyere area as shown in Figure 1 , and for the actual working condition that the above-mentioned complex multi-source fuel (coal powder, reducing gas, coke) participates in combustion together, a calculation method of thermal parameter (i.e. theoretical combustion temperature of tuyere) suitable for new operation conditions such as hydrogen-rich injection and low-carbon fuel utilization is provided, which can more accurately evaluate the thermal state of the hearth. The calculated thermal parameter can be used to guide the optimization and adjustment of the tuyere injection system, improve the thermal efficiency of the blast furnace and reduce the carbon emission level.

[0039] Figure 2 A flowchart of a determination method of a blast furnace smelting thermal parameter provided by an embodiment of the present application is shown.

[0040] As shown in Figure 2 , the method can include the following steps.

[0041] S210, in the blast furnace smelting process based on the reducing gas injection process, obtaining blast parameters and injection parameters.

[0042] The blast parameters are parameters representing the working condition of blowing hot air into the smelting furnace.

[0043] The injection parameters are parameters representing the working condition of injecting coal powder and reducing gas into the smelting furnace.

[0044] Exemplarily, the blast parameters can include multiple of blast volume (V 鼓风 ), blast humidity (A), blast temperature (T 鼓风 ), oxygen enrichment rate (B).

[0045] Exemplarily, the injection parameters can include coal injection parameters and reducing gas injection parameters.

[0046] The coal injection parameters can include coal injection amount (m 喷煤 ), coal carrier gas amount (V 载气 ), coal temperature (T 煤粉 ), coal carrier gas temperature (T 载气 ).

[0047] The reducing gas injection parameters can include reducing gas amount (V 还原气 ), reducing gas temperature (T 还原气 ).

[0048] The blast amount V 鼓风 , which represents the hot blast amount entering the furnace per unit time, has a unit of Nm 3 / min;

[0049] The blast humidity A has a unit of g / Nm 3 ;

[0050] The oxygen enrichment rate B has a unit of %;

[0051] The coal injection amount m 喷煤 has a unit of t / h;

[0052] The coal carrier gas amount V 载气 has a unit of Nm 3 / min, and the carrier gas can be nitrogen;

[0053] The blast temperature T 鼓风 , the coal temperature T 煤粉 , the coal carrier gas temperature T 载气 , and the reducing gas temperature T 还原气 all have a unit of K.

[0054] S220, the component content of the coal powder and the gas component of the reducing gas are obtained, and are determined as material parameters.

[0055] The coal powder refers to the coal powder prepared to be injected into the tuyere area, i.e., the coal powder to be injected.

[0056] Exemplarily, the components of the coal powder can include fixed carbon, volatile matter, moisture, and ash.

[0057] The fixed carbon refers to the carbon content left after the coal powder is dried and the volatile matter is removed, and reflects the ability of the coal to continuously burn at high temperature.

[0058] The volatile matter refers to the total amount of gas and steam generated by the decomposition of the coal powder at high temperature, and embodies the flammability thereof.

[0059] The moisture refers to the total amount of water contained in the coal powder.

[0060] Dry ash-free basis refers to the organic matter part of the coal powder after removing water and ash, which is suitable for further analyzing the element composition therein.

[0061] In an implementation, the coal powder sample is obtained and analyzed for the content of fixed carbon, volatile matter and moisture. Illustratively, the mass fraction of fixed carbon, volatile matter and moisture are obtained by testing, respectively denoted as:

[0062] The mass fraction of fixed carbon, i.e., m 固定碳 ;

[0063] The mass fraction of volatile matter, i.e., m 挥发分 ;

[0064] The mass fraction of moisture, i.e., m 水分 .

[0065] Further, the element content in the dry ash-free basis of the coal powder sample, such as oxygen (O), hydrogen (H), nitrogen (N), is analyzed, and the mass fraction thereof is obtained, respectively:

[0066] The mass fraction of oxygen, i.e., m O ;

[0067] The mass fraction of hydrogen, i.e., m H ;

[0068] The mass fraction of nitrogen, i.e., m N .

[0069] In summary, in an example, the component content of the coal powder includes the content of fixed carbon, volatile matter and moisture in the coal powder, and the content of each element in the dry ash-free basis of the coal powder. Illustratively, the component content can include m 固定碳 , m 挥发分 , m 水分 , m O , m H , m N .

[0070] Reducing gas refers to the reducing gas prepared to be sprayed into the tuyere area, i.e., the reducing gas to be sprayed.

[0071] Illustratively, the reducing gas can include carbon monoxide (CO), hydrogen (H2), nitrogen (N2), carbon dioxide (CO2), methane (CH4), water vapor (H2O).

[0072] In an implementation, the volume fraction of each component of the reducing gas can be determined by a gas analyzer or the like, denoted as:

[0073] The volume fraction of CO;

[0074] volume fraction of H2;

[0075] volume fraction of N2;

[0076] volume fraction of CO2;

[0077] volume fraction of CH4;

[0078] volume fraction of H2O.

[0079] It should be understood that the content of the pulverized coal component in this step and the analysis of the reducing gas component can be collected and analyzed in advance, or collected and analyzed in real time on site, for example, by laboratory testing or online sensors to obtain relevant data. The present application does not limit this.

[0080] In summary, in one example, the material parameters in this step can include m 固定碳 , m 挥发分 , m 水分 , m O , m H , m N ,

[0081] S230, according to the blast parameters, the injection parameters and the material parameters, calculating the flow of the furnace gas generated by the reaction in the tuyere circulation zone of the smelting furnace.

[0082] Furnace gas refers to a gas mixture generated by physical and chemical reactions of substances in the blast, coal injection and reducing gas under high temperature conditions in the tuyere circulation zone of the smelting furnace.

[0083] Exemplarily, the furnace gas can include main gas components such as furnace carbon monoxide (CO), furnace hydrogen (H2) and furnace nitrogen (N2).

[0084] In one implementation, based on the law of conservation of mass, the law of conservation of elements and the ideal gas state equation, the blast parameters, the injection parameters and the material parameters can be used to calculate the volume flow of furnace carbon monoxide, hydrogen and nitrogen generated by the reaction in the tuyere circulation zone of the smelting furnace, respectively.

[0085] Exemplarily, the calculation formula of the volume flow of furnace carbon monoxide is as follows:

[0086]

[0087] wherein the first term represents the contribution of water vapor (containing oxygen) and oxygen in the blast to the reaction with carbon to generate CO;

[0088] The second term The contribution of water evaporation in the coal injection and participation in the reaction;

[0089] The third term The contribution of the combustible part (fixed carbon and volatile) in the coal injection to the reaction with its oxygen elements to generate CO;

[0090] The fourth term The contribution of the relevant gas in the reducing gas to the CO flow.

[0091] Exemplarily, the calculation formula of the hydrogen in the furnace belly is as follows:

[0092]

[0093] Among them, the first term The water vapor in the blast is considered to generate H2;

[0094] The second term The H2 generated by the water in the coal injection;

[0095] The third term The H2 generated by the hydrogen-containing organic components in the pulverized coal;

[0096] The fourth term The contribution of the hydrogen-containing gas in the reducing gas.

[0097] Exemplarily, the calculation formula of the nitrogen gas volume flow in the furnace belly is as follows:

[0098]

[0099] Among them, the first term The remaining nitrogen in the blast;

[0100] The second term The N2 released by the nitrogen-containing components in the coal injection;

[0101] The third term The N2 contribution in the reducing gas;

[0102] The fourth term V 载气 , the N2 component in the introduced pulverized coal carrier gas.

[0103] S240, according to the blast parameters, the injection parameters, the material parameters and the coke parameters in the tuyere rotation zone, the input enthalpy value of the tuyere rotation zone is calculated.

[0104] The input enthalpy value refers to the total enthalpy value carried by all the materials entering the tuyere rotation zone, which is used to measure the energy input level of the tuyere rotation zone.

[0105] In an implementation mode, the input enthalpy value is the sum of the enthalpy values of each input material, that is:

[0106]

[0107] The enthalpy values of various input substances are obtained by calculating the blast enthalpy value using the blast parameters, the coal powder enthalpy value and the reducing gas enthalpy value using the material parameters and the injection parameters, and the coke enthalpy value using the coke parameters, and adding them together, so as to obtain the input enthalpy value of the tuyere raceway area.

[0108] S250, determining the tuyere theoretical combustion temperature according to the input enthalpy value and the flow rate of the bosh gas.

[0109] In order to determine the tuyere theoretical combustion temperature T f , a heat balance relationship is established based on the enthalpy conservation principle, it is assumed that the tuyere area is an adiabatic system, and the heat loss is not considered, that is, the output enthalpy value is determined according to the input enthalpy value, that is:

[0110]

[0111] The output enthalpy value refers to the total heat enthalpy of the final product in the bosh after reaching the theoretical combustion temperature T f after combustion.

[0112] Therefore, the tuyere theoretical combustion temperature can be determined according to the output enthalpy value and the flow rate of the bosh gas.

[0113] In this step, the thermodynamic enthalpy conservation principle is introduced, the quantitative relationship between the input enthalpy value and the output enthalpy value is established by introducing the enthalpy conservation principle, and the tuyere theoretical combustion temperature is accurately calculated in combination with the flow rate of the bosh gas. Compared with the method depending on the empirical formula, the physical rigor and adaptability of the calculation are improved, and the thermal state of the raceway area can be more truly reflected, thereby providing more reliable thermal reference for the blast furnace operation.

[0114] The scheme of the present application, in combination with the blast parameters, the injection parameters, the coal powder composition, the reducing gas component and the coke parameters, accurately calculates the bosh gas flow rate and the system input enthalpy value generated in the tuyere raceway area based on the energy and mass balance theory, so as to determine the tuyere theoretical combustion temperature. Compared with the traditional calculation method depending on the empirical formula, the method can adapt to new process conditions such as hydrogen-rich injection and complex furnace conditions, realize dynamic and accurate evaluation of the tuyere theoretical combustion temperature, provide reliable basis for the thermal state monitoring and operation optimization of the blast furnace, and improve the stability and energy utilization efficiency of the ironmaking process.

[0115] The solving method of the input enthalpy value is introduced below through an embodiment.

[0116] The blast enthalpy value is composed of the enthalpy values of various gases (such as oxygen, steam and nitrogen) in the blast at high temperature.

[0117] According to the blast parameters, the blast enthalpy is calculated.

[0118] Exemplarily, the expression of the blast enthalpy is:

[0119]

[0120] wherein, and respectively represent the molar amount of oxygen, water vapor and nitrogen in the blast;

[0121] and respectively represent the formation enthalpy of oxygen, water vapor and nitrogen in the blast under standard state;

[0122] respectively represent the constant-pressure specific heat capacity of oxygen, water vapor and nitrogen, and the integral represents the sensible heat from the standard temperature (298K) to the target temperature T.

[0123] The coke enthalpy represents the enthalpy of the carbon element in the coke in the tuyere rotation zone. The coke, as a solid carbon source in the tuyere rotation zone, its enthalpy mainly comes from the sensible heat of the carbon element in the coke at high temperature, and the formation enthalpy under standard state. Since the coke has been in a high temperature state before entering the reaction zone, according to the experience of gas-solid heat exchange in the lower part of the blast furnace, it is assumed that the temperature of the coke is 75% of T f , i.e. T 焦炭 = 0.75T f .

[0124] According to the coke parameters, the coke enthalpy is calculated.

[0125] Exemplarily, the formula for calculating the enthalpy of carbon in the coke is:

[0126]

[0127] wherein, represents the formation enthalpy of 1 mole of solid carbon at 298K;

[0128] represents the heat absorbed when heating the carbon from 298K to the actual temperature of the coke;

[0129] n 碳 , the molar amount of coke carbon in the rotation zone, C 碳 is the constant-pressure specific heat capacity of carbon.

[0130] The pulverized coal is usually preheated before being injected into the blast furnace tuyere rotation zone, and its heat value comes from two parts:

[0131] fixed carbon (i.e. solid carbon element), similar to coke;

[0132] The volatile components, including combustible gas components such as hydrocarbons, H2, CO, etc., can be rapidly volatilized at high temperatures and participate in the reaction.

[0133] The calculation of the enthalpy of the pulverized coal is thus divided into two components:

[0134] The enthalpy of the fixed carbon component, including the standard formation enthalpy and the sensible heat thereof;

[0135] The enthalpy of the volatile component, considering the corresponding standard formation enthalpy and the sensible heat thereof.

[0136] According to the pulverized coal injection parameters and the material parameters in the injection parameters, the enthalpy of the pulverized coal is calculated.

[0137] Exemplarily, the calculation formula of the enthalpy of the pulverized coal is as follows:

[0138]

[0139] wherein n 固定碳 , n 挥发分 respectively represent the molar amount of the fixed carbon and the volatile in the pulverized coal;

[0140] and respectively represent the standard formation enthalpy of carbon and the volatile;

[0141] C 碳 , C 挥发分 respectively represent the constant-pressure specific heat capacity of the fixed carbon and the volatile.

[0142] Exemplarily, the enthalpy of the volatile can be further calculated by weighted average according to the components.

[0143] The enthalpy of the reducing gas is composed of the thermal content of various gas components at high temperatures.

[0144] The components include carbon monoxide (CO), hydrogen (H2), nitrogen (N2), carbon dioxide (CO2), methane (CH4), and water vapor (H2O).

[0145] The enthalpy of each component is composed of the following two parts:

[0146] Standard formation enthalpy represents the formation enthalpy of component i at 298K;

[0147] Sensible heat represents the heat absorbed by component i when the temperature is raised from 298K to the actual temperature of the reducing gas.

[0148] According to the reducing gas injection parameters in the injection parameters, the enthalpy of the reducing gas is calculated.

[0149] Exemplarily, the enthalpy of the reducing gas is the sum of the enthalpy of each component, and the calculation formula is as follows:

[0150]

[0151] Finally, the output enthalpy value is determined by adding the blast enthalpy value, the coke enthalpy value, the pulverized coal enthalpy value and the reducing gas enthalpy value obtained by solving the above.

[0152] In this embodiment, the enthalpy values of the blast, coke, pulverized coal and reducing gas in the tuyere rotation zone are calculated respectively, and the input enthalpy value is determined by synthesizing them, so that the fine quantification of the heat contribution of each heat source is realized, which helps to improve the accuracy of the calculation of the tuyere theoretical combustion temperature and enhance the adaptability of the method to the blast furnace thermal state under the condition of coupling of multiple heat sources.

[0153] It can be understood that, in the application scenario of the present application, the output enthalpy value can be approximately equal to the total enthalpy value of the bosh gas. In order to more accurately reflect the specific contribution of different components in the bosh gas to the thermal state, the present application provides a total enthalpy value modeling method based on component subdivision.

[0154] In one embodiment, the total enthalpy value of the bosh gas can include the sum of the enthalpy values of several gas components such as bosh CO, bosh H2 and bosh N2, that is:

[0155]

[0156] According to the carbon monoxide flow, a first functional relationship between the bosh CO enthalpy value and the tuyere theoretical combustion temperature is determined. In other words, the enthalpy value of the bosh CO can be expressed as a functional relationship between the carbon monoxide volume flow and the integral term of its generation enthalpy and constant-pressure specific heat capacity.

[0157] Exemplarily, the first functional relationship is as follows:

[0158]

[0159] According to the hydrogen flow, a second functional relationship between the bosh H2 enthalpy value and the tuyere theoretical combustion temperature is determined. In other words, the enthalpy value of the bosh H2 can be expressed as a functional relationship between the hydrogen volume flow and the integral term of its generation enthalpy and constant-pressure specific heat capacity.

[0160] Exemplarily, the second functional relationship is as follows:

[0161]

[0162] According to the nitrogen flow, a third functional relationship between the bosh N2 enthalpy value and the tuyere theoretical combustion temperature is determined. In other words, the enthalpy value of the bosh N2 can be expressed as a functional relationship between the nitrogen volume flow and the integral term of its generation enthalpy and constant-pressure specific heat capacity.

[0163] Exemplarily, the third functional relationship is as follows:

[0164]

[0165] According to the first function relationship, the second function relationship and the third function relationship, a target function relationship between the total enthalpy value of the bosh coal gas and the theoretical combustion temperature of the tuyere is established.

[0166] Exemplarily, the target function relationship is expressed as follows:

[0167]

[0168] Under the condition that the output enthalpy value is known, the output enthalpy value is brought into the total enthalpy value of the bosh coal gas, the target function relationship is solved, and the theoretical combustion temperature of the tuyere is obtained.

[0169] In this embodiment, by subdividing the bosh coal gas into different gas components, the function relationship between the enthalpy value of each component and the temperature is established respectively, and thus the mathematical model of the total enthalpy value of the bosh coal gas is constructed comprehensively. Compared with the method of treating the bosh coal gas as a whole, this scheme is more detailed, can significantly improve the accuracy of temperature calculation, and is particularly suitable for the thermal analysis and optimization control of blast furnaces under complex operating conditions such as hydrogen-rich injection, high-proportion reduction gas injection, hydrogen-rich carbon cycle oxygen blast furnace and the like.

[0170] The effect of the method of the present application will be introduced through several examples below.

[0171] Example 1: The blast temperature of a certain test blast furnace is 1273K, the reduction gas and the coal powder are injected at the tuyere, the coal powder temperature and the reduction gas composition are shown in Table 1, and the temperature is 298K. The theoretical combustion temperature of the tuyere under different conditions can be calculated and obtained, as shown in Table 2.

[0172] Table 1 is the reduction gas composition in Example 1.

[0173] CH4 [H2] CO CO2 <![CDATA[H2O]]> [N2] 0.5 15.3 65.9 1 1.1 16.2

[0174] Table 2 is the theoretical combustion temperature of the tuyere of the blast furnace injecting the reduction gas in Example 1.

[0175]

[0176] Example 2: The blast temperature of a certain blast furnace is 1473K, the coal bed gas is injected at the tuyere, the coal bed gas composition is shown in Table 3, and the temperature is 298K. The theoretical combustion temperature of the tuyere under different conditions can be calculated and obtained, as shown in Table 4.

[0177] Table 3 is the reduction gas composition in Example 2.

[0178]

[0179]

[0180] Table 4 is the theoretical combustion temperature of the tuyere of the blast furnace injecting the coal bed gas in Example 2.

[0181]

[0182] Example 3: In a hydrogen-rich carbon cycle oxygen blast furnace, oxygen, circulating gas and coal powder are injected through the tuyere, and the temperatures are 323 K, 1473 K and 333 K respectively. The composition of the circulating gas is shown in Table 5. The theoretical combustion temperature of the tuyere under different conditions can be calculated and is shown in Table 6.

[0183] Table 5 is the composition of the reducing gas in Example 3.

[0184] CH4 [H2] CO CO2 H2O [N2] 5 7 75.5 3 0.5 9

[0185] Table 6 is the theoretical combustion temperature of the tuyere of the hydrogen-rich carbon cycle oxygen blast furnace in Example 3.

[0186]

[0187] As can be seen from the above, using the method described in the present application, the theoretical combustion temperature of the tuyere can be accurately calculated under the premise of known blast temperature, air volume, oxygen enrichment rate, humidity, coal injection amount and reducing gas composition and injection amount. Example 1 and Example 2 correspond to different types of reducing gas (reducing gas rich in CO / H2 and coal bed gas with high methane content), and Example 3 corresponds to the injection condition of the hydrogen-rich carbon cycle oxygen blast furnace, which verifies the wide applicability of the method to different gas sources, multiple components and multiple working conditions.

[0188] The above results show that the method of the present application can consider the influence of various parameters (gas composition, injection temperature, flow rate, blast characteristics, etc.) on the thermal state of the tuyere area, and construct a multi-component, multi-variable enthalpy-combustion temperature mapping model, thereby realizing quantitative prediction of the theoretical combustion temperature of the tuyere. Compared with the traditional calculation method which relies on empirical formula or single heat value estimation, the method is more detailed and flexible, especially suitable for thermal control and process optimization under complex smelting conditions such as new hydrogen-rich, high specific injection, mixed use of coal gas, etc., providing strong support for energy saving and consumption reduction and efficient operation of the blast furnace.

[0189] The method for determining the thermal parameters of blast furnace smelting is introduced above in combination with the drawings. It should be understood that, although each step in the flowchart involved in each of the above-described embodiments is shown in sequence, these steps are not necessarily executed in the order shown in the figure. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least some of the steps in the flowchart involved in each of the above-described embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least some of the other steps or the steps or stages in the other steps. The device for determining the thermal parameters of blast furnace smelting according to an embodiment of the present application is introduced below in combination with the drawings. For brevity, some descriptions will be appropriately omitted in the following introduction of the device, and the related content can be referred to the related descriptions in the above method, which will not be introduced again.

[0190] corresponding to the method described in the above embodiment, Figure 3 The structural block diagram of the device 1000 for determining the thermal parameters of blast furnace smelting according to an embodiment of the present application is shown, and only the parts related to the embodiments of the present application are shown for brevity.

[0191] As Figure 3 shown, the device 1000 can include:

[0192] The first acquisition module 1001 is configured to acquire blast parameters and injection parameters in the process of blast furnace smelting based on the reduction gas injection process.

[0193] The blast parameters are parameters representing the working condition of the hot blast blown into the smelting furnace;

[0194] The injection parameters are parameters representing the working condition of the pulverized coal and reduction gas injected into the smelting furnace.

[0195] The second acquisition module 1002 is configured to acquire the component content of the pulverized coal and the gas component of the reduction gas, and determine the material parameters;

[0196] The flow rate determination module 1003 is configured to calculate the flow rate of the bosh gas generated in the tuyere rotation zone of the smelting furnace according to the blast parameters, the injection parameters and the material parameters;

[0197] The enthalpy value determination module 1004 is configured to calculate the input enthalpy value of the tuyere rotation zone according to the blast parameters, the injection parameters, the material parameters and the coke parameters in the tuyere rotation zone;

[0198] The calculation module 1005 is configured to determine the tuyere theoretical combustion temperature according to the input enthalpy value and the flow rate of the bosh gas.

[0199] Figure 4 A hardware structure schematic diagram of an electronic device provided by an embodiment of the present application is shown.

[0200] The electronic device can include a processor 7001 and a memory 7002 storing computer program instructions.

[0201] Specifically, the processor 7001 described above can include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or can be configured to implement one or more integrated circuits of the embodiments of the present application.

[0202] The memory 7002 can include a mass storage for data or instructions. By way of example and not limitation, the memory 7002 can include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In one example, the memory 7002 can include a removable or non-removable (or fixed) media, or the memory 7002 is a non-volatile solid-state memory. The memory 7002 can be internal or external to the integrated gateway disaster recovery device.

[0203] In one example, the memory 7002 can be a read-only memory (ROM). In one example, the ROM can be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically alterable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0204] The memory 7002 can include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage media device, an optical storage media device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions that, when executed (e.g., by one or more processors), are operable to perform operations described with reference to the methods according to an aspect of the present disclosure.

[0205] The processor 7001 implements the functions of the electronic device by reading and executing the computer program instructions stored in the memory 7002. Figure 2The method for determining the thermal parameters of blast furnace smelting in the illustrated embodiment.

[0206] In one example, the electronic device can further include a communication interface 7003 and a bus 7004. Among them, as shown, the processor 7001, the memory 7002, the communication interface 7003 are connected through the bus 7004 and complete the communication between each other. Figure 4

[0207] The communication interface 7003 is mainly used to realize the communication between various modules, devices, units and / or equipment in the embodiments of the application.

[0208] The bus 7004 includes hardware, software or both to couple components of the online data traffic billing device to each other in a known manner. By way of example, and not limitation, the bus can include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association local (VLB) bus, or another suitable bus or combination of two or more of these. Where appropriate, the bus 7004 can include one or more buses. Although the present application describes and illustrates a particular bus, the present application contemplates any suitable bus or interconnect.

[0209] In addition, in combination with the method for determining the thermal parameters of blast furnace smelting in the above-mentioned embodiments, the embodiments of the present application can provide a computer storage medium to realize. The computer storage medium has computer program instructions stored thereon; the computer program instructions are executed by the processor to realize the determination method of the thermal parameters of blast furnace smelting in any of the above-mentioned embodiments.

[0210] The embodiments of the present application also provide a computer program product, comprising a computer program, the computer program is executed by the processor to realize the determination method of the thermal parameters of blast furnace smelting in any of the above-mentioned embodiments.

[0211] ​It is to be understood that the application is not limited to particular configurations and processes described herein and shown in the drawings. Detailed descriptions of known methods are omitted so as not to obscure the application in unnecessary detail. In the above embodiments, a number of specific steps are described and illustrated as examples. However, the methods of the application are not limited to the specific steps described and illustrated, and one skilled in the art can make various changes, modifications and additions, or can change the order of steps, after having understood the spirit of the application.

[0212] The functional blocks shown in the structural block diagrams described above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, and the like. When implemented in software, the elements of the application are program or code segments that are used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. A "machine-readable medium" includes any medium that can store or transfer information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, read-only memories (ROMs), flash memories, erasable read-only memories (EROMs), floppy disks, compact discs (CD-ROMs), optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments can be downloaded via computer networks such as the Internet, intranets, and the like.

[0213] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. Alternatively, computer program implemented processes can be conveyed, accessed, or retrieved from a computer-readable medium or memory, such as a storage device, a memory on a computer, or the like. The computer readable medium or memory can include a floppy diskette, a hard disk, a CD-ROM, a DVD, a flash memory, a memory stick, a magnetic tape, a semiconductor memory device, or the like. The computer readable medium or memory can store the computer program instructions, which can be executed by a computer, other programmable data processing apparatus, or other processing devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0214] The above merely describes a specific implementation of the present application. Those skilled in the art can clearly understand the specific working processes of the system, modules and units described above for the convenience and brevity of description, and the corresponding processes in the foregoing method embodiments can be referred to, which will not be described herein again. It should be understood that the protection scope of the present application is not limited in this way, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered in the protection scope of the present application.

Claims

1. A method for determining thermal parameters of blast furnace smelting, characterized in that: include: In a blast furnace smelting process based on a reducing gas injection process, blast parameters and injection parameters are obtained. The blast parameters are parameters that characterize the operating conditions of blowing hot air into the smelting furnace, and the injection parameters are parameters that characterize the operating conditions of injecting pulverized coal and reducing gas into the smelting furnace. Obtaining the component content of the pulverized coal and the gas components of the reducing gas, and determining them as material parameters; Calculating the flow rate of bosh gas generated by the reaction in the tuyere raceway of the smelting furnace according to the blast parameters, the injection parameters and the material parameters; Calculating the input enthalpy of the tuyere raceway according to the blast parameters, the injection parameters, the material parameters and the coke parameters in the tuyere raceway; The theoretical combustion temperature of the tuyere is determined according to the input enthalpy value and the flow rate of the bosh gas.

2. The method according to claim 1, characterized in that Determining the theoretical combustion temperature of the tuyere according to the input enthalpy value and the flow rate of the bosh gas includes: determining an output enthalpy value based on the input enthalpy value; The theoretical combustion temperature of the tuyere is calculated according to the output enthalpy value and the flow rate of the bosh gas.

3. The method according to claim 2, characterized in that The bosh gas includes carbon monoxide, hydrogen and nitrogen, and the flow rate of the bosh gas includes the flow rate of carbon monoxide, hydrogen and nitrogen; Calculating the theoretical combustion temperature of the tuyere according to the output enthalpy value and the flow rate of the bosh gas includes: determining a first functional relationship between the carbon monoxide enthalpy and the theoretical combustion temperature of the tuyere according to the carbon monoxide flow rate; determining a second functional relationship between the hydrogen enthalpy and the theoretical combustion temperature of the tuyere according to the hydrogen flow rate; determining a third functional relationship between nitrogen enthalpy and theoretical combustion temperature of the tuyere according to the nitrogen flow rate; Based on the first functional relationship, the second functional relationship, and the third functional relationship, establishing an objective functional relationship between the total enthalpy of the bosh gas and the theoretical combustion temperature of the tuyere; The output enthalpy value is substituted into the total enthalpy value of the bosh gas, and the objective function relationship is solved to obtain the theoretical combustion temperature of the tuyere.

4. The method according to any one of claims 1 to 3, characterized in that The blast parameters include multiple ones of blast volume, blast temperature, blast humidity and oxygen enrichment rate.

5. The method according to any one of claims 1 to 3, characterized in that The injection parameters include pulverized coal injection parameters and reducing gas injection parameters. The pulverized coal injection parameters include coal injection amount, carrier gas amount, pulverized coal temperature, and carrier gas temperature. The reducing gas injection parameters include reducing gas amount and reducing gas temperature.

6. The method according to any one of claims 1 to 3, characterized in that The composition content of the coal powder includes: the content of fixed carbon, volatile matter and moisture in the coal powder, and the content of each element in the coal powder in a dry ash-free state.

7. The method according to any one of claims 1 to 3, characterized in that The calculating the input enthalpy value of the tuyere raceway according to the blast parameter, the injection parameter, the material parameter and the coke parameter in the tuyere raceway comprises: Calculating the blast enthalpy value according to the blast parameters; Calculating the coke enthalpy according to the coke parameters; Calculating the enthalpy of the pulverized coal and the enthalpy of the reducing gas according to the injection parameters and the material parameters; The input enthalpy value is determined according to the blast enthalpy value, the coke enthalpy value, the pulverized coal enthalpy value and the reducing gas enthalpy value.

8. A device for determining thermal parameters of blast furnace smelting, characterized in that: include: The first acquisition module is configured to acquire blast parameters and injection parameters during a blast furnace smelting process based on a reducing gas injection process. The blast parameters are parameters representing the operating conditions of blowing hot air into the smelting furnace, and the injection parameters are parameters representing the operating conditions of injecting pulverized coal and reducing gas into the smelting furnace. A second acquisition module is used to obtain the component content of the pulverized coal and the gas components of the reducing gas and determine them as material parameters; a flow determination module, configured to calculate the flow rate of the bosh gas generated by the reaction in the tuyere raceway of the smelting furnace according to the blast parameters, the injection parameters, and the material parameters; an enthalpy value determination module, configured to calculate an input enthalpy value of the tuyere raceway according to the blast parameters, the injection parameters, the material parameters, and the coke parameters in the tuyere raceway; The calculation module is used to determine the theoretical combustion temperature of the tuyere according to the input enthalpy value and the flow rate of the bosh gas.

9. An electronic device, characterized in that: The device comprises: a processor and a memory storing computer program instructions; the processor reads and executes the computer program instructions to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the method according to any one of claims 1 to 7.

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