Calculation method for carbon emission data of steel smelting process

Abstract

The invention relates to the technical field of iron and steel smelting, and provides an iron and steel smelting process carbon emission data calculation method, which comprises the following steps: determining an iron and steel smelting carbon emission acquisition process boundary, constructing a process model, forming process model association, and forming a process flow. The method comprises the following steps: collecting steel smelting process material consumption data according to a process flow in a certain time unit, and carrying out data distribution according to process characteristics; and calculating the carbon emission data of the steel smelting process by using the carbon emission data calculation formula. According to the method, more detailed division and data acquisition are performed on materials in the steel smelting process, so that the steel smelting carbon emission condition in actual production can be effectively and comprehensively covered, carbon emission data of an enterprise can be accurately managed, steel smelting carbon emission sources are divided into two stages from upstream to manufacturing, seven types of conformances are formed, and the enterprise carbon emission data can be accurately managed. The carbon emission source in the actual production activity of an enterprise can be accurately displayed, and the enterprise can be guided to purposefully and accurately reduce carbon.

Description

Technical Field

[0001] The present invention relates to the technical field of steel smelting, and in particular to a method for calculating carbon emission data of a steel smelting process. Background Art

[0002] The "dual carbon" goal is to reduce carbon dioxide emissions as much as possible during industrial production, so that the carbon dioxide emissions and carbon dioxide absorption in people's production and life can reach a balance as much as possible. In order to achieve the "dual carbon" goal, a large number of key carbon emission companies have begun to implement carbon emission accounting and monitoring, and through the establishment of a full-process, fine-grained carbon emission analysis system, accurate estimation and control of carbon emissions can be achieved.

[0003] The sources of carbon emissions are divided into three major sources: energy, raw materials and auxiliary materials according to the type of materials. At present, the steel industry's accounting of carbon emissions data can be accurate to the type of materials that are the source of carbon emissions, but it cannot accurately locate the specific production links where carbon emissions are generated. As a result, companies cannot clearly identify the reasons for their high carbon emissions, which is not conducive to companies making emission reduction improvements. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for calculating carbon emission data for steel smelting processes, which solves the problem in the prior art that enterprises are unable to clearly identify the reasons for their high carbon emissions, which is not conducive to enterprises making emission reduction improvements.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a method for calculating carbon emission data of a steel smelting process, comprising:

[0006] S1. Determine the specific links in the actual production activities of steel enterprises involving carbon emission collection, and build process models for the corresponding process links, including process names, process levels and material information;

[0007] S2. Associate the constructed process model according to the actual production relationship, construct the relationship between the main process and the main process, the relationship between the main process and the secondary process, and the relationship between the process and the material, and form a complete steel smelting process flow;

[0008] S3. Collect data in a certain time unit, and summarize the material consumption data per unit time of each main process according to the steel smelting process flow, mainly including the following 6 categories: energy and power medium, raw materials, auxiliary materials, main products, by-products and waste;

[0009] S4. Determine whether to allocate data based on process characteristics. Whether data allocation depends on whether the product of the main process is a finished steel grade. The data needs to be allocated in proportion according to the series of steel grades;

[0010] S5. For each main process of steel smelting, carbon emission data is calculated according to the upstream stage and the steel product production and manufacturing stage.

[0011] Preferably, in S3, the energy and power medium data includes:

[0012] The coking process takes the consumption data for the whole year;

[0013] The energy consumption data of the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken for the whole year;

[0014] The energy consumption of the steelmaking process (converter, refining, continuous casting) and the rolling process (hot rolling, cold rolling, coating and plating) can be calculated by multiplying the annual energy consumption by the proportion of the series of steel grades.

[0015] Preferably, in S3, the raw material data includes:

[0016] The coking process takes the raw material consumption data for the whole year;

[0017] The raw material consumption data for the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken for the whole year;

[0018] The material consumption of the corresponding series of steel grades for the steelmaking process (converter, refining, continuous casting) and the rolling process (hot rolling, cold rolling, coating and plating) throughout the year is taken.

[0019] Preferably, in S3, the auxiliary material data includes:

[0020] The coking process takes the auxiliary material consumption data for the whole year;

[0021] The annual auxiliary material consumption data for the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken;

[0022] The steelmaking process (converter, refining, continuous casting) and the rolling process (hot rolling, cold rolling, coating and plating) take the auxiliary material consumption of the corresponding series of steel grades throughout the year.

[0023] Preferably, in S3, the main product data includes:

[0024] The coking process takes the annual coke output;

[0025] Ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace):

[0026] (1) The premix is ​​the amount of raw materials and by-products for the whole year. It does not distinguish between steel types.

[0027] (2) For sintering, pelletizing, coal injection and blast furnace, the output is taken from the annual production report, without distinguishing between steel types;

[0028] The steelmaking process (converter, refining, continuous casting) and rolling process (hot rolling, cold rolling, coating and plating) take the annual output of the corresponding series of steel grades throughout the year.

[0029] Preferably, in S3, the by-product data includes:

[0030] Coking process:

[0031] (1) The annual output of coke oven gas is divided by use, without distinguishing by steel type.

[0032] (2) Other by-products are based on the annual output without distinguishing between steel types;

[0033] The ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) takes the annual output without distinguishing the steel type;

[0034] The steelmaking process (converter, refining, continuous casting) and rolling process (hot rolling, cold rolling, coating and plating) are calculated by multiplying the annual by-product output by the proportion of steel grades.

[0035] Preferably, in S3, the waste data includes:

[0036] The coking process takes the annual waste generation without distinguishing the steel types;

[0037] The annual waste generation of the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken without distinguishing between steel types;

[0038] The annual waste generation of the steelmaking process (converter, refining, continuous casting) and the steel rolling process (hot rolling, cold rolling, coating and plating) is multiplied by the proportion of steel types.

[0039] Preferably, in said S5, the calculation formula of the upstream stage data is as follows: upstream stage = transportation load + upstream load + by-product external benefits;

[0040] The data calculation formula for the steel product production and manufacturing stage is as follows: Steel product production and manufacturing stage = direct load + energy load + intermediate product load + by-product internal benefit.

[0041] Preferably, the transportation load is the carbon emissions generated by the transportation of various materials, and the data source is the transportation tools used in the actual transportation process.

[0042] Transportation load = energy and power medium transportation emissions + raw material transportation emissions + auxiliary material transportation emissions + (transportation load of the previous process * unit consumption of this process), the specific formula is as follows:

[0043]

[0044] L i is the transportation distance of the ith material or intermediate product;

[0045] M i The unit consumption of materials in this process;

[0046] U j The unit consumption value of the main product of the previous process consumed by this process;

[0047] CF μ上道工序 Emissions from transportation to the previous process.

[0048] The upstream load is the emissions generated during the manufacturing process of raw materials and auxiliary materials.

[0049] Upstream load = total displacement between raw materials + total displacement between auxiliary materials + upstream load of the previous process * unit consumption of this process - total displacement of intermediate products in the raw materials. The specific formula is as follows:

[0050]

[0051] Among them, CF σ is the upstream load;

[0052] CF σ上道工序 It is the upstream load of the previous process;

[0053] U j The unit consumption value of the main product of the previous process consumed by this process;

[0054] EF 材料隐含排放j is the material implicit emission factor of the jth intermediate product (i.e. the main product of the previous process);

[0055] M i The unit consumption of each energy and power medium, and each raw and auxiliary material;

[0056] EF 材料隐含排放i It is the implicit emission factor of each energy medium and each raw and auxiliary material.

[0057] The by-product external benefit = - (the total volume of by-products sold out + the unit consumption of this process * the by-product external benefit of the previous process), the specific formula is as follows:

[0058]

[0059] U i Unit consumption of by-products sold out of this process;

[0060] U j The unit consumption value of the main product of the previous process consumed by this process;

[0061] CF γ外上道工序 It is the external benefit of by-products of the previous process;

[0062] CF γ外 It is the external benefit of by-product.

[0063] Preferably, the direct load is the emissions generated by the input materials during the production process.

[0064] Direct load = (direct discharge of energy and power medium + direct discharge of raw materials + direct discharge of auxiliary materials) - (direct discharge of main products + direct discharge of by-products) + direct discharge of waste. The specific formula is as follows:

[0065]

[0066] Among them, M i The unit consumption of each energy and power medium, and each raw and auxiliary material;

[0067] EF 生产过程排放i is the emission factor of the production process of the ith material or product;

[0068] P i Unit consumption of main products and by-products;

[0069] W i Waste with no utilization value;

[0070] CF α Direct load is the carbon emission in the production process of this process;

[0071] The energy load is the emission generated by energy power media during the manufacturing process, generally referring to the energy produced by the public and auxiliary processes of the steel plant, such as hydrogen, compressed air, electricity, etc.

[0072] Energy load = total displacement of energy and power medium + energy load of previous process * unit consumption of this process. The specific formula is as follows:

[0073]

[0074] Among them, E i It is the unit consumption of energy and power medium;

[0075] EF 材料隐含排放i is the implicit emission factor of the i-th energy power medium material;

[0076] U j The unit consumption value of the main product of the previous process consumed by this process;

[0077] CF ε上道工序 It is the energy load produced by the previous process.

[0078] The intermediate products meet the emissions generated during the production process of products in the intermediate processes.

[0079] Intermediate product load = (intermediate product load of the previous process + direct load of the previous process) * unit consumption of this process. The specific formula is as follows:

[0080]

[0081] Among them, CF θ is the intermediate product load;

[0082] CF θ上道工序i is the load of the ith intermediate product of the previous process. If this process is the first process, the load of the intermediate product is 0;

[0083] CF α上道工序i Directly load the previous process;

[0084] U i The unit consumption value of the main product of the previous process consumed by this process.

[0085] The by-product internal benefits refer to the recycling and reuse of by-products by steel enterprises, at which time carbon emissions must be offset for the by-products used by the enterprises themselves.

[0086] By-product internal benefit = - (the sum of the displacement of by-product internal benefit + the unit consumption of this process * the by-product internal benefit of the previous process), the specific formula is as follows:

[0087]

[0088] Among them, U i Unit consumption of by-products produced by this process for self-use;

[0089] U j The unit consumption value of the main product of the previous process consumed by this process;

[0090] CF γ内上道工序 It is the internal revenue of the by-product of the previous process;

[0091] CF γ内 It is the internal benefit of the by-product.

[0092] The present invention provides a method for calculating carbon emission data of a steel smelting process. It has the following beneficial effects:

[0093] 1. The present invention can effectively and comprehensively cover the carbon emissions of steel smelting in actual production by carrying out a more detailed division and data collection of materials in the steel smelting process, thereby accurately managing the carbon emission data of the enterprise.

[0094] 2. The present invention divides the sources of carbon emissions from steel smelting into two stages and seven types from upstream to manufacturing. It can accurately display the sources of carbon emissions in the actual production activities of enterprises, effectively assist enterprises in locating high-carbon emission links, and better guide enterprises to reduce carbon emissions in a purposeful and accurate manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] Figure 1A method for calculating carbon emission data of a steel smelting process of the present invention;

[0096] Figure 2 This is a schematic diagram of the data allocation method provided by the present invention. DETAILED DESCRIPTION

[0097] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0098] Embodiment 1:

[0099] An embodiment of the present invention provides a method for calculating carbon emission data of a steel smelting process, including taking one of the actual production links of a steel enterprise as an example: coking process -> ironmaking process -> steelmaking process -> steel rolling process.

[0100] First, the above-mentioned process links are determined as the main processes for collecting carbon emissions from steel enterprises, and the secondary process links involved in each main process are further clarified. Among them, the ironmaking process includes the secondary processes of premix, sintering, pelletizing, coal injection, and blast furnace; the steelmaking process includes the secondary processes of converter, refining, and continuous casting; the steel rolling process includes hot rolling, cold rolling, and coating.

[0101] Then, a process model is constructed for the above process, including process name, process category (main process, secondary process) and material information, wherein the material information includes basic material information and transportation information, wherein the basic material information includes material name, type (energy, raw materials, etc.), process relationship (input / output), code, source, standard unit, consumption, emission factor, and the transportation information includes material name, transportation method, transportation type, transportation unit, transportation distance and transportation emission factor.

[0102] Finally, the constructed process model is associated according to the actual production relationship to form the process flow and the process and material flow. The process flow includes the relationship between the main process and the main process, and the relationship between the main process and the secondary process. That is, the main process relationship is coking process -> ironmaking process -> steelmaking process -> steel rolling process, and the main and secondary process relationship is (hot rolling process -> cold rolling process -> coating and plating process) -> steel rolling process.

[0103] Embodiment 2:

[0104] Please see attached Figure 2The embodiment of the present invention provides a method for calculating carbon emission data of a steel smelting process, including collecting data in units of years, collecting and summarizing the material consumption data of each secondary process, and summarizing the annual material consumption data of each main process, which mainly includes the following 6 categories: energy and power media, raw materials, auxiliary materials, main products, by-products and waste.

[0105] Whether to allocate data is determined based on process characteristics. Whether data is allocated depends on whether the product of the main process is a finished steel grade. The data needs to be proportionally calculated and allocated according to the series of steel grades. The specific data processing is as follows:

[0106] 1. Energy and power media data

[0107] Coking process takes annual consumption data

[0108] Energy consumption data for the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) for the whole year

[0109] The energy consumption of steelmaking process (converter, refining, continuous casting) and rolling process (hot rolling, cold rolling, coating and plating) can be calculated by multiplying the annual energy consumption by the proportion of the series of steel grades.

[0110] 2. Raw material data

[0111] The raw material consumption data of the coking process is taken throughout the year

[0112] Raw material consumption data for the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) for the whole year

[0113] The material consumption of the corresponding series of steel grades in the steelmaking process (converter, refining, continuous casting) and the rolling process (hot rolling, cold rolling, coating and plating) for the whole year

[0114] 3. Excipient data

[0115] The coking process takes the annual auxiliary material consumption data

[0116] The annual auxiliary material consumption data of the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace)

[0117] The auxiliary material consumption of the corresponding series of steel grades in the steelmaking process (converter, refining, continuous casting) and the rolling process (hot rolling, cold rolling, coating and plating) throughout the year

[0118] 4. Main product data

[0119] The coking process takes the annual coke output

[0120] Ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace)

[0121] (1) Premix is ​​the amount of raw materials and by-products for the whole year. No distinction is made between steel types.

[0122] (2) For sintering, pelletizing, coal injection and blast furnace, the output is taken from the annual production report, regardless of steel type.

[0123] The annual output of the corresponding series of steel grades for the steelmaking process (converter, refining, continuous casting) and the rolling process (hot rolling, cold rolling, coating and plating) is taken

[0124] 5. By-product data

[0125] 1. Coking process

[0126] (1) The annual output of coke oven gas is divided by use, but not by steel type.

[0127] (2) Other by-products are based on annual output, without distinguishing between steel types.

[0128] 2. The annual output of ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken without distinguishing steel types.

[0129] 3. For steelmaking process (converter, refining, continuous casting) and rolling process (hot rolling, cold rolling, coating and plating), take the annual by-product output multiplied by the steel grade ratio

[0130] VI. Waste Data

[0131] 1. The waste generated in the coking process is taken throughout the year without distinguishing the steel types.

[0132] 2. The annual waste generation of ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken without distinguishing steel types.

[0133] 3. For the steelmaking process (converter, refining, continuous casting) and the steel rolling process (hot rolling, cold rolling, coating and plating), the annual waste generation amount is multiplied by the proportion of steel types.

[0134] Embodiment three:

[0135] The carbon emission data of the steel smelting process is divided into two parts: the upstream stage and the steel product manufacturing stage, and calculated using the following formula:

[0136] Upstream stage = transport load + upstream load + by-product external benefits;

[0137] Steel product production and manufacturing stage = direct load + energy load + intermediate product load + by-product internal benefits.

[0138] The above fields are described as follows:

[0139] The transportation load refers to the carbon emissions generated by the transportation of various materials. The data source is the transportation tools used in the actual transportation process.

[0140] Transportation load = energy and power medium transportation emissions + raw material transportation emissions + auxiliary material transportation emissions + (transportation load of the previous process * unit consumption of this process), the specific formula is as follows:

[0141]

[0142] Upstream loads are emissions from raw materials and auxiliary materials during the manufacturing process.

[0143] Upstream load = total displacement between raw materials + total displacement between auxiliary materials + upstream load of the previous process * unit consumption of this process - total displacement of intermediate products in the raw materials. The specific formula is as follows:

[0144]

[0145] By-product external benefits = - (the total volume of by-products sold out + the unit consumption of this process * the by-product external benefits of the previous process), the specific formula is as follows:

[0146]

[0147] Direct loads are emissions generated during the production process of input materials.

[0148] Direct load = (direct discharge of energy and power medium + direct discharge of raw materials + direct discharge of auxiliary materials) - (direct discharge of main products + direct discharge of by-products) + direct discharge of waste. The specific formula is as follows:

[0149]

[0150] Energy load refers to the emissions generated by energy and power media during the manufacturing process, generally referring to the energy produced by the public and auxiliary processes of the steel plant, such as hydrogen, compressed air, electricity, etc.

[0151] Energy load = total displacement of energy and power medium + energy load of previous process * unit consumption of this process. The specific formula is as follows:

[0152]

[0153] Intermediate products meet the emissions generated during the production process of products in the intermediate process.

[0154] Intermediate product load = (intermediate product load of the previous process + direct load of the previous process) * unit consumption of this process. The specific formula is as follows:

[0155]

[0156] By-product internal benefits refer to the recycling and reuse of by-products by steel companies, at which time carbon emissions must be offset for by-products used by the company itself.

[0157] By-product internal benefit = - (the sum of the displacement of by-product internal benefit + the unit consumption of this process * the by-product internal benefit of the previous process), the specific formula is as follows:

[0158]

[0159] Based on the above calculation formula, the carbon emission data of each process in the enterprise's steel smelting process can be obtained.

[0160] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for calculating carbon emission data of a steel smelting process, characterized in that: The following steps are involved: S1. Determine the specific links in the actual production activities of steel enterprises involving carbon emission collection, and build process models for the corresponding process links, including process names, process levels and material information; S2. Associate the constructed process model according to the actual production relationship, construct the relationship between the main process and the main process, the relationship between the main process and the secondary process, and the relationship between the process and the material, and form a complete steel smelting process flow; S3. Collect data in a certain time unit, and summarize the material consumption data per unit time of each main process according to the steel smelting process flow, mainly including the following 6 categories: energy and power medium, raw materials, auxiliary materials, main products, by-products and waste; S4. Determine whether to allocate data based on process characteristics. Whether data allocation depends on whether the product of the main process is a finished steel grade. The data needs to be allocated in proportion according to the series of steel grades; S5. For each main process of steel smelting, carbon emission data is calculated according to the upstream stage and the steel product production and manufacturing stage.

2. The method for calculating carbon emission data of a steel smelting process according to claim 1, characterized in that: In S3, the energy and power medium data include: The coking process takes the consumption data for the whole year; The energy consumption data of the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken for the whole year; The steelmaking process (converter, refining, continuous casting) and rolling process (hot rolling, cold rolling, coating and plating) can be calculated by multiplying the annual energy consumption by the proportion of the series of steel grades.

3. The method for calculating carbon emission data of a steel smelting process according to claim 1, characterized in that: In S3, the raw material data includes: The coking process takes the raw material consumption data for the whole year; The raw material consumption data for the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken for the whole year; The material consumption of the corresponding series of steel grades for the steelmaking process (converter, refining, continuous casting) and the rolling process (hot rolling, cold rolling, coating and plating) throughout the year is taken.

4. The method for calculating carbon emission data of a steel smelting process according to claim 1, characterized in that: In S3, the auxiliary material data includes: The coking process takes the auxiliary material consumption data for the whole year; The annual auxiliary material consumption data for the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken; The consumption of auxiliary materials for the corresponding series of steel grades throughout the year is taken for the steelmaking process (converter, refining, continuous casting) and the rolling process (hot rolling, cold rolling, coating and plating).

5. The method for calculating carbon emission data of a steel smelting process according to claim 1, characterized in that: In S3, the main product data includes: The coking process takes the annual coke output; Ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace): (1) The premix is ​​the amount of raw materials and by-products for the whole year. It does not distinguish between steel types. (2) For sintering, pelletizing, coal injection and blast furnace, the output is taken from the annual production report, without distinguishing between steel types; The steelmaking process (converter, refining, continuous casting) and rolling process (hot rolling, cold rolling, coating and plating) take the annual output of the corresponding series of steel grades throughout the year.

6. The method for calculating carbon emission data of a steel smelting process according to claim 1, characterized in that: In S3, the by-product data includes: Coking process: (1) The annual output of coke oven gas is divided by use, without distinguishing by steel type. (2) Other by-products are based on the annual output without distinguishing between steel types; The ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) takes the annual output without distinguishing the steel type; The steelmaking process (converter, refining, continuous casting) and rolling process (hot rolling, cold rolling, coating and plating) are calculated by multiplying the annual by-product output by the proportion of steel grades.

7. The method for calculating carbon emission data of a steel smelting process according to claim 1, characterized in that: In S3, the waste data includes: The coking process takes the annual waste generation without distinguishing the steel types; The annual waste generation of the ironmaking process (premix, sintering, pelletizing, coal injection, blast furnace) is taken without distinguishing between steel types; The annual waste generation of the steelmaking process (converter, refining, continuous casting) and the steel rolling process (hot rolling, cold rolling, coating and plating) is multiplied by the proportion of steel types.

8. The method for calculating carbon emission data of a steel smelting process according to claim 1, characterized in that: In said S5, the calculation formula of the upstream stage data is as follows: upstream stage = transportation load + upstream load + by-product external benefits; The data calculation formula for the steel product production and manufacturing stage is as follows: Steel product production and manufacturing stage = direct load + energy load + intermediate product load + by-product internal benefit.

9. The method for calculating carbon emission data of a steel smelting process according to claim 8, characterized in that: The transportation load refers to the carbon emissions generated by the transportation of various materials, and the data source is the transportation tools used in the actual transportation process. Transportation load = energy and power medium transportation emissions + raw material transportation emissions + auxiliary material transportation emissions + (transportation load of the previous process * unit consumption of this process), the specific formula is as follows: L i is the transportation distance of the ith material or intermediate product; M i The unit consumption of materials in this process; U j The unit consumption value of the main product of the previous process consumed by this process; CF μ上道工序 Emissions from transportation to the previous process. The upstream load is the emissions generated during the manufacturing process of raw materials and auxiliary materials. Upstream load = total displacement between raw materials + total displacement between auxiliary materials + upstream load of the previous process * unit consumption of this process - total displacement of intermediate products in the raw materials. The specific formula is as follows: Among them, CF σ is the upstream load; CF σ上道工序 It is the upstream load of the previous process; U j The unit consumption value of the main product of the previous process consumed by this process; EF 材料隐含排放j is the material implicit emission factor of the jth intermediate product (i.e. the main product of the previous process); M i The unit consumption of each energy medium, each raw material and auxiliary material; EF 材料隐含排放i It is the implicit emission factor of each energy medium and each raw and auxiliary material. The by-product external benefit = - (the total volume of by-products sold out + the unit consumption of this process * the by-product external benefit of the previous process), the specific formula is as follows: U i Unit consumption of by-products produced by this process for sale; U j The unit consumption value of the main product of the previous process consumed by this process; CF γ外上道工序 It is the external benefit of by-products of the previous process; CF γ外 It is the external benefit of by-product.

10. The method for calculating carbon emission data of a steel smelting process according to claim 8, characterized in that: The direct load is the emission generated by the input materials during the production process. Direct load = (direct discharge of energy and power medium + direct discharge of raw materials + direct discharge of auxiliary materials) - (direct discharge of main products + direct discharge of by-products) + direct discharge of waste. The specific formula is as follows: Among them, M i The unit consumption of each energy medium, each raw material and auxiliary material; EF 生产过程排放i is the emission factor of the production process of the ith material or product; P i Unit consumption of main products and by-products; W i Waste with no utilization value; CF α Direct load is the carbon emission in the production process of this process; The energy load is the emission generated by energy power media during the manufacturing process, generally referring to the energy produced by the public and auxiliary processes of the steel plant, such as hydrogen, compressed air, electricity, etc. Energy load = total displacement of energy and power medium + energy load of previous process * unit consumption of this process. The specific formula is as follows: Among them, E i It is the unit consumption of energy and power medium; EF 材料隐含排放i is the implicit emission factor of the i-th energy power medium material; U j The unit consumption value of the main product of the previous process consumed by this process; CF ε上道工序 It is the energy load produced by the previous process. The intermediate products meet the emissions generated during the production process of products in the intermediate processes. Intermediate product load = (intermediate product load of the previous process + direct load of the previous process) * unit consumption of this process. The specific formula is as follows: Among them, CF θ is the intermediate product load; CF θ上道工序i is the load of the ith intermediate product of the previous process. If this process is the first process, the load of the intermediate product is 0; CF α上道工序i Directly load the previous process; U i The unit consumption value of the main product of the previous process consumed by this process. The by-product internal benefits refer to the recycling and reuse of by-products by steel enterprises, at which time carbon emissions must be offset for the by-products used by the enterprises themselves. By-product internal benefit = - (the sum of the displacement of by-product internal benefit + the unit consumption of this process * the by-product internal benefit of the previous process), the specific formula is as follows: Among them, U i Unit consumption of by-products produced by this process for self-use; U j The unit consumption value of the main product of the previous process consumed by this process; CF γ内上道工序 It is the internal revenue of the by-product of the previous process; CF γ内 Internal revenue of by-products.

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