A method and system for regulating the ratio of low-carbon fuels

Abstract

The present invention provides a method and system for regulating the low-carbon fuel ratio, including: obtaining the raw fuel conditions, fuel ratio, operation parameters, and preset regulation times during blast furnace smelting, performing material balance calculation and heat balance calculation during blast furnace smelting based on the raw fuel conditions, operation parameters, and fuel ratio, and simultaneously obtaining the carbon in the coke consumed at the tuyere; then calculating the reduction carbon consumption after the complete combustion of the tuyere injection medium when meeting the restrictive conditions of fuel supply amount, material balance, and heat balance; when the reduction carbon consumption after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere, calculating the carbon consumption per ton of pig iron during blast furnace smelting, and outputting the fuel ratio corresponding to the lowest carbon consumption within the preset regulation times. The present invention can associate the combustion behavior and reduction behavior of the tuyere injection medium with coke consumption, providing a basis for determining the low-carbon fuel ratio of the blast furnace, so as to determine the low-carbon consumption smelting process parameters under any fuel conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace smelting, and particularly to a method and system for regulating low-carbon fuel ratio. Background Art

[0002] At present, the carbon emissions of blast furnaces account for about 70% of the total carbon emissions in the steelmaking process. Therefore, the key to low-carbon steelmaking lies in blast furnace smelting. The main fuels and reducing agents in blast furnace smelting are the main sources of carbon emissions, that is, the heat and reducing agents in blast furnace smelting mainly come from carbon.

[0003] In recent years, injecting hydrogen-rich materials to replace some carbonaceous fuels and reducing agents has become a direction for low-carbon ironmaking. However, how to determine the appropriate injection volume, coke ratio, and coal ratio to meet both energy and reducing agent consumption and achieve low-carbon goals is a key issue in current blast furnace ironmaking. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a method and system for regulating low-carbon fuel ratio to solve the technical problems existing in the prior art.

[0005] To achieve the above purpose and other related purposes, the present invention provides a method for regulating low-carbon fuel ratio, including the following steps:

[0006] Obtain the raw material and fuel conditions, operating parameters, and fuel ratio during blast furnace smelting, as well as the preset number of regulation times for regulating the fuel ratio of the blast furnace;

[0007] Set the restrictive conditions for fuel supply, material balance, and heat balance, and perform material balance calculation and heat balance calculation during blast furnace smelting based on the raw material and fuel conditions, operating parameters, and fuel ratio, and simultaneously obtain the carbon in the coke consumed at the tuyere;

[0008] Calculate the reduction carbon consumption after complete combustion of the tuyere injection medium when the restrictive conditions for fuel supply, material balance, and heat balance are met;

[0009] When the reduction carbon consumption after complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere, calculate the carbon consumption per ton of iron in blast furnace smelting;

[0010] Output the fuel ratio corresponding to the lowest carbon consumption within the preset number of regulation times.

[0011] Optionally, when calculating the reduction carbon consumption after complete combustion of the tuyere injection medium when the restrictive conditions for fuel supply, material balance, and heat balance are met, the method further includes:

[0012] Judge whether the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere;

[0013] If the carbon consumption for reduction after the complete combustion of the tuyere injection medium is greater than the carbon in the coke consumed at the tuyere, adjust the fuel ratio during blast furnace smelting, and perform material balance and heat balance calculations again based on the adjusted fuel ratio. When the material balance and heat balance are satisfied, calculate the carbon consumption for reduction after the complete combustion of the tuyere injection medium until the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere;

[0014] If the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere, calculate the carbon consumption per ton of iron in blast furnace smelting.

[0015] Optionally, before outputting the fuel ratio corresponding to the lowest carbon consumption within the preset regulation times, the method further includes:

[0016] Judge whether the calculation rank value of the carbon consumption at the current moment is equal to the preset regulation times value;

[0017] If the calculation rank value of the carbon consumption at the current moment is equal to the preset regulation times value, output the fuel ratio corresponding to the lowest carbon consumption within the preset regulation times;

[0018] If the calculation rank value of the carbon consumption at the current moment is less than the preset regulation times value, adjust the fuel ratio during blast furnace smelting and calculate the carbon consumption of the next rank based on the adjusted fuel ratio.

[0019] Optionally, the fuel supply restrictive conditions include: the maximum supply per ton of iron of coke, pulverized coal, and injection medium;

[0020] The material balance restrictive conditions and heat balance restrictive conditions include: element distribution ratio, slag basicity, top gas temperature, hot metal enthalpy, slag enthalpy, gas utilization rate, and heat loss ratio.

[0021] Optionally, the raw fuel conditions include: ore, flux, coke, blast air, pulverized coal, coke oven gas, natural gas, blast furnace gas, converter gas, and other carbon- and hydrogen-containing materials.

[0022] This application also provides a low-carbon fuel ratio regulation system, and the system includes:

[0023] A data acquisition module for obtaining the raw fuel conditions, fuel ratio, operating parameters, and preset regulation times during blast furnace smelting;

[0024] A restrictive condition module for setting fuel supply restrictive conditions, material balance restrictive conditions, and heat balance restrictive conditions;

[0025] The material balance and heat balance calculation module is used to calculate the material balance and heat balance that meet the restrictive conditions of fuel supply amount, material balance and heat balance during blast furnace smelting according to the original fuel conditions, operating parameters and fuel ratio, and at the same time obtain the carbon in the coke consumed at the tuyere;

[0026] The carbon consumption balance calculation module before the tuyere is used to calculate the carbon consumption for reduction after the complete combustion of the tuyere injection medium when meeting the restrictive conditions of fuel supply amount, material balance and heat balance;

[0027] The carbon consumption calculation module is used to calculate the carbon consumption per ton of iron in blast furnace smelting when the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere;

[0028] The fuel ratio output module is used to output the fuel ratio corresponding to the lowest carbon consumption within the preset number of regulation times.

[0029] Optionally, the system further includes: a carbon consumption balance judgment module before the tuyere, which is used to judge whether the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere;

[0030] The first fuel ratio adjustment module is used to adjust the fuel ratio during blast furnace smelting when the carbon consumption for reduction after the complete combustion of the tuyere injection medium is greater than the carbon in the coke consumed at the tuyere;

[0031] After the first fuel ratio adjustment module adjusts the fuel ratio, the material balance and heat balance calculation module further includes: re-performing material balance and heat balance calculations based on the adjusted fuel ratio; the carbon consumption balance calculation module before the tuyere further includes: calculating the carbon consumption for reduction after the complete combustion of the tuyere injection medium according to the material balance and heat balance after adjusting the fuel ratio.

[0032] Optionally, the system further includes: a regulation times judgment module, which is used to judge whether the calculated ranking value of the carbon consumption at the current moment is equal to the preset regulation times value;

[0033] The second fuel ratio adjustment module is used to adjust the fuel ratio during blast furnace smelting when the calculated ranking value of the carbon consumption at the current moment is less than the preset regulation times value;

[0034] After the second fuel ratio adjustment module adjusts the fuel ratio, the carbon consumption calculation module further includes: calculating the carbon consumption of the next ranking based on the adjusted fuel ratio;

[0035] When the calculated ranking value of the carbon consumption at the current moment is equal to the preset regulation times value, the fuel ratio output module outputs the fuel ratio corresponding to the lowest carbon consumption within the preset regulation times.

[0036] Optionally, the fuel supply restrictive conditions include: the maximum supply per ton of iron of coke, pulverized coal, and injection medium;

[0037] The material balance restrictive conditions and heat balance restrictive conditions include: element distribution ratio, slag basicity, top gas temperature, hot metal enthalpy, slag enthalpy, gas utilization rate, and heat loss ratio.

[0038] Optionally, the raw fuel conditions include: ore, flux, coke, blast air, pulverized coal, coke oven gas, natural gas, blast furnace gas, converter gas, and other materials containing carbon and hydrogen.

[0039] As described above, the present invention provides a method and system for regulating low-carbon fuel ratio, having the following beneficial effects: The present invention first obtains the raw fuel conditions, operation parameters, and fuel ratio during blast furnace smelting, as well as the preset number of regulation times for fuel ratio regulation of the blast furnace; then sets the fuel supply restrictive conditions, material balance restrictive conditions, and heat balance restrictive conditions, and based on the raw fuel conditions, operation parameters, and fuel ratio, performs material balance calculation and heat balance calculation during blast furnace smelting, and at the same time obtains the carbon in the coke consumed at the tuyere; then calculates the reduction carbon consumption after complete combustion of the injection medium at the tuyere when the fuel supply restrictive conditions, material balance, and heat balance are satisfied; when the reduction carbon consumption after complete combustion of the injection medium at the tuyere is less than or equal to the carbon in the coke consumed at the tuyere, calculates the carbon consumption per ton of iron during blast furnace smelting; finally outputs the fuel ratio corresponding to the lowest carbon consumption within the preset number of regulation times. It can be seen that the present invention can make the heat in the blast furnace and the heat of the reducing agent meet the restrictions of material balance and heat balance, and can also correlate the combustion behavior and reduction behavior of the tuyere injection with coke consumption, providing a basis for determining the low-carbon fuel ratio consumption in the blast furnace, so as to determine the low-carbon consumption smelting process parameters under any fuel conditions. Description of the Drawings

[0040] Figure 1 It is a schematic flow chart of the low-carbon fuel ratio regulation method provided by an embodiment of the present invention;

[0041] Figure 2 It is a schematic flow chart of the low-carbon fuel ratio regulation method provided by another embodiment of the present invention;

[0042] Figure 3 It is a schematic hardware structure diagram of the low-carbon fuel ratio regulation system provided by an embodiment of the present invention. Detailed Embodiments

[0043] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0044] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0045] Please refer to Figure 1 As shown, this embodiment provides a method for regulating the low-carbon fuel ratio, including the following steps:

[0046] S110, obtain the raw fuel conditions, operation parameters, and fuel ratio during blast furnace smelting, as well as the preset number of regulation times for regulating the fuel ratio of the blast furnace. As an example, the number of regulation times in this embodiment can be set according to the actual situation, for example, it can be set to 2000 times, 5000 times, etc. In addition, the raw fuel conditions in this embodiment include but are not limited to: ores, fluxes, coke, blast air, pulverized coal, coke oven gas, natural gas, blast furnace gas, converter gas, and other carbon- and hydrogen-containing materials, etc. In some examples, the raw fuel conditions may also include other in-furnace fuels, and no specific type restrictions are made here.

[0047] S120, set the restrictive conditions for fuel supply amount, material balance, and heat balance, and perform material balance calculation and heat balance calculation during blast furnace smelting based on the raw fuel conditions, operation parameters, and fuel ratio, and at the same time obtain the carbon in the coke consumed at the tuyere;

[0048] S130, calculate the reduction carbon consumption after the complete combustion of the tuyere injection medium when the restrictive conditions for fuel supply amount, material balance, and heat balance are met;

[0049] S140, when the reduction carbon consumption after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere, calculate the carbon consumption per ton of iron in blast furnace smelting;

[0050] S150, output the fuel ratio corresponding to the lowest carbon consumption within the preset number of regulation times.

[0051] It can be seen from this that this embodiment can enable the heat in the blast furnace and the heat of the reducing agent to meet the limitations of material balance and heat balance. Moreover, it can also correlate the combustion behavior and reduction behavior of the tuyere injection with coke consumption, providing a basis for determining the low-carbon fuel ratio consumption in the blast furnace, so as to determine the low-carbon consumption smelting process parameters under any fuel conditions.

[0052] In an exemplary embodiment, when calculating the reduction carbon consumption after the complete combustion of the tuyere injection medium under the restrictive conditions of fuel supply, material balance and heat balance, this embodiment may further include:

[0053] Judging whether the reduction carbon consumption after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere;

[0054] If the reduction carbon consumption after the complete combustion of the tuyere injection medium is greater than the carbon in the coke consumed at the tuyere, adjust the fuel ratio during blast furnace smelting, and perform material balance and heat balance calculations again based on the adjusted fuel ratio. When the material balance and heat balance are met, calculate the reduction carbon consumption after the complete combustion of the tuyere injection medium until the reduction carbon consumption after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere;

[0055] If the reduction carbon consumption after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere, calculate the carbon consumption per ton of iron in blast furnace smelting.

[0056] According to the above description, in an exemplary embodiment, before outputting the fuel ratio corresponding to the lowest carbon consumption within the preset regulation times, this embodiment may further include: judging whether the calculation rank value of the carbon consumption at the current moment is equal to the preset regulation times value; if the calculation rank value of the carbon consumption at the current moment is equal to the preset regulation times value, output the fuel ratio corresponding to the lowest carbon consumption within the preset regulation times; if the calculation rank value of the carbon consumption at the current moment is less than the preset regulation times value, adjust the fuel ratio during blast furnace smelting, and calculate the carbon consumption of the next rank based on the adjusted fuel ratio. As an example, for example, the preset regulation times is 2000 times. If the calculation rank value of the carbon consumption at the current moment is 1800, and 1800 is less than 2000 at this time, then continue to adjust the fuel ratio during blast furnace smelting, and calculate the carbon consumption when the rank value is 1801 based on the adjusted fuel ratio. If the calculation rank value of the carbon consumption at the current moment is 2000, and the rank value is equal to the preset regulation times value at this time, output the fuel ratio corresponding to the lowest carbon consumption within these 2000 times.

[0057] In an exemplary embodiment, the fuel supply restrictive conditions include: the maximum supply per ton of iron of coke, pulverized coal, and injection medium; the material balance restrictive conditions and the heat balance restrictive conditions include: element distribution ratio, slag basicity, top gas temperature, hot metal enthalpy, slag enthalpy, gas utilization rate, and heat loss ratio.

[0058] In another exemplary embodiment of the present invention, as Figure 2 shown, this embodiment further provides a low-carbon fuel ratio regulation method, including the following steps:

[0059] Step a: Obtain the raw fuel conditions; including: obtaining substances such as ore, flux, coke, blast air, pulverized coal, coke oven gas, natural gas, blast furnace gas, converter gas, and other carbon- and hydrogen-containing materials entering the blast furnace.

[0060] Step b: Preset the initial fuel ratio; including: setting initial fuel and reducing agents such as coke ratio, coal ratio, injection medium amount, etc.

[0061] Step c: Set the restrictive conditions; including: setting the restrictive conditions for material balance and heat balance calculations, including element distribution ratio, slag basicity, hot metal enthalpy, slag enthalpy, gas utilization rate, and heat loss ratio.

[0062] Step d: Calculate the material balance and heat balance; including: adjusting the consumption of each preset fuel and reducing agent to perform material balance and heat balance calculations, and the calculated material balance and heat balance meet the set restrictive conditions.

[0063] Step e: Check whether the carbon consumption in front of the tuyere is balanced; including: calculating the carbon consumption W 需 for reduction after complete combustion of the injection medium at the tuyere, and the carbon in the coke consumed at the tuyere W 焦 , by adjusting the consumption of each fuel and reducing agent, meeting the restrictive conditions of material balance and heat balance, and satisfying W 需 <W 焦 ;

[0064] Step f: Calculate the carbon consumption; including: calculating the carbon consumption of each fuel and the carbon consumption in the reducing agent that meet the material balance, heat balance, restrictive conditions, and carbon consumption balance in front of the tuyere.

[0065] Step g: Determine the fuel ratio with low carbon consumption; including: calculating the carbon consumption that meets the restrictive conditions in the preset number of regulation times, so as to determine the lowest carbon consumption and fuel ratio.

[0066] According to the above description, in a specific example, a process of specifically implementing a low-carbon fuel ratio regulation method described in some of the above embodiments is provided, including:

[0067] Step 1), obtain the original fuel conditions as shown in Table 1 below.

[0068] Table 1 Data Sheet of Original Fuel Conditions for a Certain Blast Furnace

[0069]

[0070] Step 2), obtain the preset initial fuel ratio. Specifically, for the production conditions of a certain blast furnace: coke ratio 352 Kg / tFe, coal ratio 145 Kg / tFe, flux 14.727 Kg / tFe, blast temperature 1192 °C, oxygen enrichment rate 4%, gas 49.7%, gas temperature 112 °C.

[0071] Step 3), set restrictive conditions. Specifically: set the restrictive conditions for material balance and heat balance calculations, including the distribution rate of elements, slag basicity, enthalpy of hot metal, enthalpy of slag, gas utilization rate, and proportion of heat loss. Among them, the data for setting restrictive conditions are shown in Table 2 below.

[0072] Table 2 Data Sheet for Setting Restrictive Conditions

[0073] Element distribution ratio Element λ entering gas μ entering slag η entering pig iron Fe 0.0025 0.9975 Mn 0.4 0.6 V 0.2 0.8 S 0.05 Ti 0.83 0.17 Slag basicity m(CaO) / m(SiO2) 1.22 Direct reduction degree of iron rd 0.56 Top gas temperature ℃ 112 Coke rate Kg / t 352 Pulverized coal injection rate Kg / t 145 Enthalpy of hot metal Qe KJ / Kg hot metal 1051 Enthalpy of slag Qu KJ / Kg slag 1564

[0074] In Table 2, the gas utilization rate does not exceed 56% of the thermodynamic limit and production practice, and the heat loss is generally about 2% according to the heat loss ratio of the same type of blast furnace.

[0075] Step 4), calculate the material balance and heat balance. Specifically, the material balance calculated according to the above conditions is shown in Table 3 below, and the heat balance is shown in Table 4 below.

[0076] Table 3 Material Balance Table

[0077]

[0078] Table 4 Heat Balance Table

[0079]

[0080] Step 5), verify whether the carbon consumption before the tuyere is balanced. Specifically, calculate the carbon consumption W for reduction after the complete combustion of the tuyere injection medium 需 = 135.534 Kg / tFe, and the carbon in the coke consumed at the tuyere W 焦 = 168.300 Kg / tFe, satisfying W 需 < W 焦 .

[0081] Step 6), calculate the carbon consumption. Specifically, the carbon consumption at the initial fuel ratio = 352*(1 - 4%)*85.4% + 145*(1 - 1.5%)*70.6% + 14.727*(1 - 2%)*43.7% / 44*12 = 391.382 Kg / tFe.

[0082] Step 7), determine whether the calculated ranking value of the carbon consumption at the current moment is equal to the preset number of regulation times. If the calculated ranking value of the carbon consumption at the current moment is equal to the preset regulation times value, output the fuel ratio corresponding to the lowest carbon consumption within the preset regulation times; if the calculated ranking value of the carbon consumption at the current moment is less than the preset regulation times value, adjust the fuel ratio during blast furnace smelting, and calculate the carbon consumption of the next ranking based on the adjusted fuel ratio. As an example, for instance, the preset number of regulation times is 2000 times. If the calculated ranking value of the carbon consumption at the current moment is 1800, and at this time 1800 is less than 2000, then continue to adjust the fuel ratio during blast furnace smelting, and calculate the carbon consumption when the ranking value is 1801 based on the adjusted fuel ratio. If the calculated ranking value of the carbon consumption at the current moment is 2000, and at this time the carbon consumption ranking value is equal to the preset regulation times value, then output the fuel ratio corresponding to the lowest carbon consumption within 2000 times. Specifically, keep the coal ratio still at 145 Kg / tFe, increase the injection of coke oven gas, reduce the coke ratio, calculate multiple groups of working conditions. When injecting 20 m 3 / tFe of coke oven gas and the coke ratio is 336 Kg / tFe, calculate 12.304 Kg / tFe of flux through material balance and heat balance, calculate the carbon consumption W 需 = 155.289 Kg / tFe for the complete combustion and reduction of the tuyere injection medium, and the carbon in the coke consumed at the tuyere W 焦 = 155.375 Kg / tFe, satisfying W 需 < W 焦 , and the corresponding carbon consumption = 336*(1 - 4%)*85.4% + 145*(1 - 1.5%)*70.6% + 12.304*(1 - 2%)*43.7% / 44*12 + 25 / 22.4*(0.22*12 / 16 + 0.09*12 / 28 + 0.025*24 / 26) = 377.990 Kg / tFe. After the 2000th regulation is completed, it is the fuel ratio corresponding to the lowest carbon consumption. If after the 2000th regulation is completed, the lowest carbon consumption is 377.990 Kg / tFe, then output the fuel ratio when the carbon consumption is 377.990 Kg / tFe.

[0083] In summary, the present invention provides a method for regulating the low-carbon fuel ratio. First, obtain the raw fuel conditions, operating parameters, and fuel ratio during blast furnace smelting, as well as the preset number of regulation times for regulating the fuel ratio of the blast furnace. Then, set the restrictive conditions for fuel supply amount, material balance, and heat balance, and perform material balance calculation and heat balance calculation during blast furnace smelting based on the raw fuel conditions, operating parameters, and fuel ratio, and at the same time obtain the carbon in the coke consumed at the tuyere. Next, calculate the reduction carbon consumption after the complete combustion of the tuyere injection medium when the restrictive conditions for fuel supply amount, material balance, and heat balance are satisfied. When the reduction carbon consumption after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere, calculate the carbon consumption per ton of iron smelted in the blast furnace. Finally, output the fuel ratio corresponding to the lowest carbon consumption within the preset number of regulation times. It can be seen from this that this method can make the heat in the blast furnace hearth and the heat of the reducing agent meet the limitations of material balance and heat balance, and can also correlate the combustion behavior and reduction behavior of the tuyere injection with coke consumption, providing a basis for determining the low-carbon fuel ratio consumption in the blast furnace, so as to determine the low-carbon consumption smelting process parameters under any fuel conditions.

[0084] The present invention also provides a low-carbon fuel ratio regulation system, as Figure 3 shown. The system in this embodiment includes a background processing system and a client system. The background processing system includes: obtaining raw fuel conditions; presetting an initial fuel ratio; setting restrictive conditions for fuel supply amount, material balance, and heat balance; calculating material balance and heat balance; verifying whether the restrictive conditions for fuel supply amount, material balance, and heat balance are satisfied; verifying whether the carbon consumption before the tuyere is balanced; adjusting the fuel ratio, repeating calculations and verifications; calculating carbon consumption; determining the fuel ratio of low-carbon consumption. The client system includes: an input module for raw fuel conditions; a fuel ratio presetting and adjusting module; an output module for the fuel ratio of low-carbon consumption. Specifically, the low-carbon fuel ratio regulation system in this embodiment includes:

[0085] A data acquisition module, which is used to obtain the raw fuel conditions, fuel ratio, operating parameters, and preset number of regulation times during blast furnace smelting. As an example, the number of regulation times in this embodiment can be set according to actual conditions, for example, it can be set to 2000 times, 5000 times, etc. In addition, the raw fuel conditions in this embodiment include but are not limited to: ores, fluxes, coke, blast air, pulverized coal, coke oven gas, natural gas, blast furnace gas, converter gas, and other carbon- and hydrogen-containing materials, etc. In some examples, the raw fuel conditions can also include other fuels charged into the furnace, and no specific type restrictions are made here.

[0086] A restrictive condition module, which is used to set the restrictive conditions for fuel supply amount, material balance, and heat balance;

[0087] The material balance and heat balance calculation module is used to calculate the material balance and heat balance that meet the restrictive conditions of fuel supply amount, material balance, and heat balance during blast furnace smelting according to the original fuel conditions, operating parameters, and fuel ratio, and at the same time obtain the carbon in the coke consumed at the tuyere;

[0088] The carbon consumption balance calculation module before the tuyere is used to calculate the carbon consumption for reduction after the complete combustion of the tuyere injection medium when meeting the restrictive conditions of fuel supply amount, material balance, and heat balance;

[0089] The carbon consumption calculation module is used to calculate the carbon consumption per ton of iron in blast furnace smelting when the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere;

[0090] The fuel ratio output module is used to output the fuel ratio corresponding to the lowest carbon consumption within the preset number of regulation times.

[0091] It can be seen that this embodiment can make the heat in the blast furnace hearth and the heat of the reducing agent meet the restrictions of material balance and heat balance, and can also correlate the combustion behavior and reduction behavior of the tuyere injection with coke consumption, providing a basis for determining the low-carbon fuel ratio consumption in the blast furnace, so as to determine the low-carbon consumption smelting process parameters under any fuel conditions.

[0092] In an exemplary embodiment, the low-carbon fuel ratio regulation system further includes:

[0093] The carbon consumption balance judgment module before the tuyere is used to judge whether the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere;

[0094] The first fuel ratio adjustment module is used to adjust the fuel ratio during blast furnace smelting when the carbon consumption for reduction after the complete combustion of the tuyere injection medium is greater than the carbon in the coke consumed at the tuyere;

[0095] After the first fuel ratio adjustment module adjusts the fuel ratio, the material balance and heat balance calculation module further includes: performing material balance and heat balance calculations again based on the adjusted fuel ratio; the carbon consumption balance calculation module before the tuyere further includes: calculating the carbon consumption for reduction after the complete combustion of the tuyere injection medium according to the material balance and heat balance after adjusting the fuel ratio.

[0096] The regulation times judgment module is used to judge whether the calculated ranking value of the carbon consumption at the current moment is equal to the preset regulation times value;

[0097] The second fuel ratio adjustment module is used to adjust the fuel ratio during blast furnace smelting when the calculated ranking value of the carbon consumption at the current moment is less than the preset regulation times value;

[0098] After the second fuel ratio adjustment module adjusts the fuel ratio, the carbon consumption calculation module further includes: calculating the carbon consumption of the next order based on the adjusted fuel ratio;

[0099] When the calculation order value of the carbon consumption at the current moment is equal to the preset regulation number value, the fuel ratio output module outputs the fuel ratio corresponding to the lowest carbon consumption within the preset regulation number. As an example, for example, the preset regulation number is 2000 times. If the calculation order value of the carbon consumption at the current moment is 1800, and 1800 is less than 2000 at this time, then continue to adjust the fuel ratio during blast furnace smelting, and calculate the carbon consumption when the order value is 1801 based on the adjusted fuel ratio. If the calculation order value of the carbon consumption at the current moment is 2000, and the order value is equal to the preset regulation number value at this time, then output the fuel ratio corresponding to the lowest carbon consumption within these 2000 times.

[0100] In an exemplary embodiment, the fuel supply restrictive conditions include: the maximum supply per ton of iron of coke, pulverized coal, and injection medium; the material balance restrictive conditions and heat balance restrictive conditions include: element distribution rate, slag basicity, top gas temperature, hot metal enthalpy, slag enthalpy, gas utilization rate, and heat loss ratio.

[0101] In another exemplary embodiment of the present invention, this embodiment further provides a low-carbon fuel ratio regulation system for performing the following steps:

[0102] Step a: Obtain the raw fuel conditions; including: obtaining the fuel substances such as ore, flux, coke, blast air, pulverized coal, coke oven gas, natural gas, blast furnace gas, converter gas, and other carbon- and hydrogen-containing materials entering the blast furnace;

[0103] Step b: Preset the initial fuel ratio; including: setting the initial coke ratio, coal ratio, injection medium quantity, and other fuels and reducing agents;

[0104] Step c: Set the restrictive conditions; including: setting the restrictive conditions for material balance and heat balance calculations, including the element distribution rate, slag basicity, hot metal enthalpy, slag enthalpy, gas utilization rate, and heat loss ratio;

[0105] Step d: Calculate the material balance and heat balance; including: adjusting the consumption of each preset fuel and reducing agent to perform material balance and heat balance calculations, and the calculated material balance and heat balance meet the set restrictive conditions;

[0106] Step e: Verify whether the carbon consumption in front of the tuyere is balanced; including: calculating the carbon consumption W 需 for reduction after complete combustion of the injection medium at the tuyere, and the carbon in the coke consumed at the tuyere W 焦, by adjusting the consumption of each fuel and reducing agent, the restrictive conditions of material balance and heat balance are satisfied, and W is satisfied 需 <W 焦 ;

[0107] Step f: Calculate carbon consumption; including: calculating the carbon consumption of each fuel and the carbon consumption in the reducing agent that satisfy the restrictive conditions of material balance, heat balance, and carbon consumption balance in front of the tuyere.

[0108] Step g: Determine the fuel ratio with low carbon consumption; including: calculating the carbon consumption that satisfies the restrictive conditions in the preset number of regulation times, so as to determine the lowest carbon consumption and fuel ratio.

[0109] In summary, the present invention provides a low-carbon fuel ratio regulation system. First, obtain the raw fuel conditions, operating parameters, and fuel ratio during blast furnace smelting, as well as the preset number of regulation times for regulating the fuel ratio of the blast furnace; then set the restrictive conditions of fuel supply amount, material balance, and heat balance, and perform material balance calculation and heat balance calculation during blast furnace smelting based on the raw fuel conditions, operating parameters, and fuel ratio, and at the same time obtain the carbon in the coke consumed at the tuyere; then calculate the reduction carbon consumption after the complete combustion of the tuyere injection medium when the restrictive conditions of fuel supply amount, material balance, and heat balance are satisfied; when the reduction carbon consumption after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere, calculate the carbon consumption per ton of iron in blast furnace smelting; finally, output the fuel ratio corresponding to the lowest carbon consumption within the preset number of regulation times. It can be seen that this system can make the heat in the blast furnace and the heat of the reducing agent meet the restrictions of material balance and heat balance, and can also correlate the combustion behavior and reduction behavior of the tuyere injection with coke consumption, providing a basis for determining the low-carbon fuel ratio consumption in the blast furnace, so as to determine the low-carbon consumption smelting process parameters under any fuel conditions.

[0110] It should be noted that the low-carbon fuel ratio regulation system provided in the above embodiment and the low-carbon fuel ratio regulation method provided in the above embodiment belong to the same concept. The specific ways in which each module and unit perform operations have been described in detail in the method embodiment, and will not be repeated here. The low-carbon fuel ratio regulation system provided in the above embodiment can, in actual application, allocate the above functions to different functional modules as needed, that is, divide the internal structure of the system into different functional modules to complete all or part of the functions described above, and no limitation is imposed here. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0111] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

[0112] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

Claims

1. A method for regulating the ratio of low-carbon fuels, characterized in that, The method includes the following steps: Obtain the raw fuel conditions, operating parameters, and fuel ratio during blast furnace smelting, as well as the preset number of regulation times for regulating the fuel ratio of the blast furnace; Set the restrictive conditions for fuel supply amount, material balance, and heat balance, and perform material balance calculation and heat balance calculation during blast furnace smelting based on the raw fuel conditions, operating parameters, and fuel ratio, and simultaneously obtain the carbon in the coke consumed at the tuyere; Calculate the reduction carbon consumption after complete combustion of the tuyere injection medium when the restrictive conditions for fuel supply amount, material balance, and heat balance are met, including: determining whether the reduction carbon consumption after complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere; if the reduction carbon consumption after complete combustion of the tuyere injection medium is greater than the carbon in the coke consumed at the tuyere, adjust the fuel ratio during blast furnace smelting, and perform material balance and heat balance calculations again based on the adjusted fuel ratio, and when the material balance and heat balance are met, calculate the reduction carbon consumption after complete combustion of the tuyere injection medium until the reduction carbon consumption after complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere; if the reduction carbon consumption after complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere, calculate the carbon consumption per ton of hot metal during blast furnace smelting; Determine whether the calculated ranking value of the carbon consumption at the current moment is equal to the preset number of regulation times value; If the calculated ranking value of the carbon consumption at the current moment is equal to the preset number of regulation times value, output the fuel ratio corresponding to the lowest carbon consumption within the preset number of regulation times; If the calculated ranking value of the carbon consumption at the current moment is less than the preset number of regulation times value, adjust the fuel ratio during blast furnace smelting, and calculate the carbon consumption of the next ranking based on the adjusted fuel ratio.

2. The low-carbon fuel ratio regulation method according to claim 1, characterized in that The restrictive condition for fuel supply amount includes: the maximum supply amount per ton of hot metal of coke, pulverized coal, and injection medium; The restrictive conditions for material balance and heat balance include: element distribution rate, slag basicity, top gas temperature, hot metal enthalpy, slag enthalpy, gas utilization rate, and heat loss ratio.

3. The method for regulating the low-carbon fuel ratio according to claim 1, wherein, The raw fuel conditions include: ore, flux, coke, blast air, and pulverized coal, coke oven gas, natural gas, blast furnace gas, converter gas, and other carbon- and hydrogen-containing materials used for blast furnace smelting.

4. A low-carbon fuel ratio regulation system, characterized in that, The system includes: A data acquisition module for obtaining the raw fuel conditions, fuel ratio, operating parameters, and preset number of regulation times during blast furnace smelting; A restrictive condition module for setting the restrictive conditions for fuel supply amount, material balance, and heat balance; A material balance and heat balance calculation module for calculating the material balance and heat balance that meet the restrictive conditions for fuel supply amount, material balance, and heat balance during blast furnace smelting based on the raw fuel conditions, operating parameters, and fuel ratio, and simultaneously obtaining the carbon in the coke consumed at the tuyere; and performing material balance and heat balance calculations again based on the fuel ratio adjusted by the first fuel ratio adjustment module; The carbon consumption balance calculation module before the tuyere is used to calculate the carbon consumption for reduction after the complete combustion of the tuyere injection medium when meeting the restrictive conditions of fuel supply amount, material balance, and heat balance; and, calculate the carbon consumption for reduction after the complete combustion of the tuyere injection medium according to the material balance and heat balance after adjusting the fuel ratio by the first fuel ratio adjustment module; The carbon consumption balance judgment module before the tuyere is used to judge whether the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere; The carbon consumption calculation module is used to calculate the carbon consumption per ton of iron in blast furnace smelting when the carbon consumption for reduction after the complete combustion of the tuyere injection medium is less than or equal to the carbon in the coke consumed at the tuyere; and, calculate the carbon consumption for the next order based on the fuel ratio adjusted by the second fuel ratio adjustment module; The first fuel ratio adjustment module is used to adjust the fuel ratio during blast furnace smelting when the carbon consumption for reduction after the complete combustion of the tuyere injection medium is greater than the carbon in the coke consumed at the tuyere; The regulation times judgment module is used to judge whether the calculated order value of the carbon consumption at the current moment is equal to the preset regulation times value; The fuel ratio output module is used to output the fuel ratio corresponding to the lowest carbon consumption within the preset regulation times when the calculated order value of the carbon consumption at the current moment is equal to the preset regulation times value; The second fuel ratio adjustment module is used to adjust the fuel ratio during blast furnace smelting when the calculated order value of the carbon consumption at the current moment is less than the preset regulation times value.

5. The low-carbon fuel ratio regulation system according to claim 4, characterized in that The restrictive conditions of the fuel supply amount include: the maximum supply amount per ton of iron of coke, pulverized coal, and injection medium; The restrictive conditions of the material balance and heat balance include: element distribution rate, slag basicity, top gas temperature, hot metal enthalpy, slag enthalpy, gas utilization rate, and heat loss ratio.

6. The low-carbon fuel ratio regulation system according to claim 4 or 5, characterized in that The raw fuel conditions include: ore, flux, coke, blast air, and pulverized coal, coke oven gas, natural gas, blast furnace gas, converter gas, and other carbon- and hydrogen-containing materials used for blast furnace smelting.

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