Method and system for evaluating carbon footprint of steel product

Abstract

The invention is suitable for the technical field of carbon reduction and energy conservation, and provides a steel product carbon footprint evaluation method and system, and the method comprises the steps: obtaining the production process data and energy circulation data of a to-be-evaluated product, and determining the production unit process of the to-be-evaluated product according to the production process data, determining an energy unit process of the to-be-evaluated product according to the energy transfer data; according to the second input data and the second output data of the energy unit process, calculating a self-produced energy carbon emission factor of the to-be-evaluated product through an energy system carbon emission factor model; obtaining first input data and first output data of a production unit process, and determining a process coefficient of the to-be-evaluated product in the production process according to the first input data and the first output data; and based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data, obtaining a carbon footprint evaluation result of the to-be-evaluated product through a life cycle carbon footprint evaluation model.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon reduction and energy conservation, and in particular relates to a carbon footprint evaluation method and system for steel products. Background Art

[0002] Green and low-carbon development has become the top priority for the transformation and upgrading of the steel industry. Steel companies should improve their carbon footprint evaluation method system to deeply analyze and understand the steel product structure and emission indicators, continuously optimize production processes and product structure, and enhance carbon emission reduction competitiveness.

[0003] The existing carbon footprint calculation at the steel industry level is often not targeted and accurate, and does not conform to the actual production situation of steel enterprises. This makes it difficult to effectively combine the carbon emission data in actual production to carry out specific coordination and control in the process of implementing carbon footprint evaluation, and to achieve targeted carbon footprint evaluation. Specifically, the existing life cycle carbon footprint calculation model mainly simply linearly connects the upstream and downstream process links through material flow, and the research object is only crude steel products or large categories of steel products. In actual production, the same steel enterprise often produces many types of steel products. Different types of steel products have different specific production routes between different equipment, resulting in the carbon footprint of the product being different from that of large categories of steel products. In the existing carbon footprint calculation method, the emission factors of energy and energy media are mostly directly derived from the database. There are differences in the values ​​of emission factors in different databases, and the uncertainty caused by different sources is large, resulting in inaccurate carbon footprint calculation results, difficult to compare, and difficult to explain. In the production process of steel products, due to the different sources of the same energy, the direct or indirect carbon footprints brought by different sources are also different. After the purchased energy and energy by-products in the production system enter the energy system, different forms of energy conversion will occur. Therefore, the carbon footprint of the energy system outputting self-produced energy is determined by the conversion relationship between the energy in the energy system. The energy system is an important part of the steel production system and is closely related to the production system. Models that do not include the energy system in the entire steel production process cannot fully reflect the carbon footprint differences caused by the specific transformation relationship of various types of energy in the steel production process. It does not conform to the flow laws of material flow and energy flow in the actual production of steel products, resulting in a large difference between the calculated carbon footprint of steel products and the actual production. Summary of the invention

[0004] The present invention provides a carbon footprint evaluation method and system for steel products, which can solve the problem in the prior art that the carbon footprint calculation results of steel products are quite different from the actual production.

[0005] In a first aspect, the present invention provides a method for evaluating the carbon footprint of a steel product, comprising: Obtaining production process data of the product to be evaluated and energy flow data of the energy system that supplies energy for the production process of the product to be evaluated, and determining the production unit process of the product to be evaluated and the production flow relationship between each production unit process based on the production process data, and determining the energy unit process of the energy system and the energy flow relationship between each energy unit process based on the energy flow data; Acquire the second input data and the second output data of the energy unit process according to the energy flow relationship, and calculate the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model; Acquire first input data and first output data of the production unit process according to the production flow relationship, and determine the process coefficient of the product to be evaluated in the production process according to the first input data and the first output data; Based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data, a carbon footprint evaluation result of the product to be evaluated is obtained through a life cycle carbon footprint evaluation model.

[0006] Optionally, the step of determining a process coefficient of the product to be evaluated in the production process according to the first input data and the first output data includes: characterizing the production unit process by a ratio of the first input data to the first output data; The proportional relationship between each production unit process and the preset functional unit is determined according to the number of main products in the first output data, and the proportional relationship is used as the process coefficient of the product to be evaluated in the production process.

[0007] Optionally, before the step of obtaining the second input data and the second output data of the energy unit process according to the energy flow relationship and calculating the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model, the step further includes: Obtain the power energy flow relationship of the power energy unit process in the energy system; Obtaining known carbon emission factors and known carbon offset factors, and establishing a power system carbon emission factor model based on the known carbon emission factors, the known carbon offset factors and the power energy flow relationship; The energy system is characterized according to the energy structure of the energy system through the power system carbon emission factor model to obtain the energy system carbon emission factor model.

[0008] Optionally, the step of characterizing the energy system according to the energy structure of the energy system through the power system carbon emission factor model to obtain the energy system carbon emission factor model includes: Determining data on energy types produced by the energy system according to the energy structure of the energy system; Establishing a carbon emission factor model for each energy source in the form of the power system carbon emission factor model to obtain a carbon emission factor model group; The power system carbon emission factor model and the carbon emission factor model group are summed and combined to obtain an energy system carbon emission factor model.

[0009] Optionally, the energy system carbon emission factor model is:

[0010] Among them, for water systems x for a For thermal systems x for b For gas systems x for c For oxygen systems x for d For power systems x is 1, x When is 1, F 1 is the carbon emission factor of electricity consumption, p 1 is the total electricity consumption, I 1 is the first determinant of the quantities of various inputs when the energy produced is electrical energy, O 1 is the second determinant of the amount of various outputs when the energy produced is electrical energy, F is the third determinant of carbon emissions and carbon offset factors; ∘ is the Hadamard operator.

[0011] Optionally, the step of obtaining the second input data and the second output data of the energy unit process according to the energy flow relationship, and calculating the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model includes: Determine the target energy type of the energy produced by the energy unit process according to the energy flow relationship, and obtain the first target determinant of the energy unit process according to the target energy type as the second input data; Obtaining a second target determinant of the energy unit process according to the target energy type as second output data; The self-generated energy carbon emission factor of the product to be evaluated is calculated based on a third target determinant corresponding to the target energy type, the second input data, the second output data and the energy system carbon emission factor model.

[0012] Optionally, the step of obtaining the carbon footprint evaluation result of the product to be evaluated through a life cycle carbon footprint evaluation model based on the process coefficient and the self-produced energy carbon emission factor includes: Calculate the unit process carbon footprint of the product to be evaluated based on the self-produced energy carbon emission factor, the first input data and the first output data; The carbon footprint of each unit process is multiplied by the process coefficient of each unit process, and then the sum is accumulated to obtain the total carbon footprint result of the product to be evaluated in the production process; The sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated is calculated by the life cycle carbon footprint evaluation model to obtain the carbon footprint evaluation result of the product to be evaluated.

[0013] Optionally, before the step of calculating the sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated by the life cycle carbon footprint evaluation model, the step further includes: According to a preset boundary, various modes of transportation of raw materials within the preset boundary, and transportation carbon emission factors and transportation distance data of transporting the raw materials per unit distance by various modes of transportation are obtained; Calculate the total transport carbon emission factor for all transport modes based on the transport carbon emission factor, the transport distance data and the correction factor; The transportation carbon footprint of the product to be evaluated is calculated based on the total transportation carbon emission factor and the process coefficient.

[0014] In another aspect, the present invention provides a carbon footprint assessment system for steel products, the system comprising: A data acquisition module is used to obtain the production process data of the product to be evaluated, and the energy flow data of the energy system that supplies energy for the production process of the product to be evaluated, and determine the production unit process of the product to be evaluated and the production flow relationship of each production unit process according to the production process data, and determine the energy unit process of the energy system and the energy flow relationship of each energy unit process according to the energy flow data; A first calculation module is used to obtain the second input data and the second output data of the energy unit process according to the energy flow relationship, and calculate the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model; A second calculation module, used for obtaining first input data and first output data of the production unit process according to the production flow relationship, and determining a process coefficient of the product to be evaluated in the production process according to the first input data and the first output data; An evaluation module is used to obtain a carbon footprint evaluation result of the product to be evaluated through a life cycle carbon footprint evaluation model based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data.

[0015] In a third aspect, an embodiment of the present invention provides a terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.

[0016] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

[0017] Compared with the prior art, the present invention has the following beneficial effects: Carbon footprint evaluation of steel products combined with actual energy flow conversion and flow relationship of energy system. Through the conversion relationship of energy flow in unit processes of energy system and its flow relationship between different unit processes, the carbon emission factor model of each energy source and energy medium of energy system is obtained. The carbon emission factor of self-produced energy in the factory is obtained by solving the model. Combining the conversion relationship of material flow and energy flow in unit processes of production system in steel production process and its flow relationship between different unit processes, it is realized that when the energy flow flow and conversion relationship of unit processes in the energy system of the factory are known, the carbon emission factor of all self-produced energy is obtained through the carbon emission factor of known energy, which makes up for the defect of inaccurate carbon footprint evaluation results caused by the existing method using energy emission factors in the database, and realizes more accurate, more targeted and more in line with the actual production of steel products. Carbon footprint calculation of the life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a flow chart of a carbon footprint evaluation method for steel products provided in one embodiment of the present application; Figure 2 is a flow chart of a carbon footprint evaluation method for steel products provided in another embodiment of the present application; Figure 3 It is a structural schematic diagram of a carbon footprint assessment system for steel products provided in one embodiment of the present application; Figure 4 is a structural block diagram of an electronic device in one embodiment; Figure 5 FIG. 4 is a structural block diagram of a computer storage medium in another embodiment. DETAILED DESCRIPTION

[0020] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0021] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0022] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0023] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0024] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0025] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0026] Figure 1A schematic flow chart of a carbon footprint evaluation method for a steel product provided in the present application is shown. The present application embodiment provides a carbon footprint evaluation method for a steel product, comprising: S101, obtaining the production process data of the product to be evaluated, and the energy flow data of the energy system that supplies energy for the production process of the product to be evaluated, and determining the production unit process of the product to be evaluated and the production flow relationship between each production unit process according to the production process data, and determining the energy unit process of the energy system and the energy flow relationship between each energy unit process according to the energy flow data; Exemplarily, the production process of the product to be evaluated is divided into a production system and an energy system, and the production process data of the product to be evaluated is obtained based on the production system, and the energy flow data of the energy system is obtained.

[0027] S102, obtaining second input data and second output data of the energy unit process according to the energy flow relationship, and calculating the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model; S103, acquiring first input data and first output data of the production unit process according to the production flow relationship, and determining a process coefficient of the product to be evaluated in the production process according to the first input data and the first output data; S104. Based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data, a carbon footprint evaluation result of the product to be evaluated is obtained through a life cycle carbon footprint evaluation model.

[0028] Carbon footprint evaluation of steel products combined with actual energy flow conversion and flow relationship of energy system. Through the conversion relationship of energy flow in unit processes of energy system and its flow relationship between different unit processes, the carbon emission factor model of each energy source and energy medium of energy system is obtained. The carbon emission factor of self-produced energy in the factory is obtained by solving the model. Combining the conversion relationship of material flow and energy flow in unit processes of production system in steel production process and its flow relationship between different unit processes, it is realized that when the energy flow flow and conversion relationship of unit processes in the energy system of the factory are known, the carbon emission factor of all self-produced energy is obtained through the carbon emission factor of known energy, which makes up for the defect of inaccurate carbon footprint evaluation results caused by the existing method using energy emission factors in the database, and realizes more accurate, more targeted and more in line with the actual production of steel products. Carbon footprint calculation of the life cycle.

[0029] In a possible implementation manner, before obtaining the production process data of the product to be evaluated and the energy flow data of the energy system that supplies energy for the production process of the product to be evaluated, and determining the production unit process of the product to be evaluated and the production flow relationship between each production unit process according to the production process data, and determining the energy unit process of the energy system and the energy flow relationship between each energy unit process according to the energy flow data, the step further includes: Clarify the carbon footprint assessment targets for steel products, including: Quantify the energy and resource-related inputs and outputs during the production of major categories of steel products or specific types of steel products within steel enterprises, and evaluate the carbon footprint of steel products in this process, providing companies with a basis for quantifying the carbon footprint of steel products, improving production processes, and promoting low-carbon transformation and development.

[0030] Specifically, the specific types of steel products include a certain type of steel products obtained by detailed classification of steel products according to production process (such as cold / hot rolled products), processing technology (hood annealing / continuous return), shape (such as round bar / square bar), size (such as hot-rolled thin steel strip / medium and thick plate), performance (such as plasticity / hardness) and use (such as automotive materials / building materials).

[0031] Clarify the functional units for carbon footprint assessment of steel products, including: Clarify the functions and roles of the steel product production system, and obtain a measurement unit that can quantitatively link all unit process inputs and outputs and facilitate functional comparison. In the steel product system, a unit process is usually a unit of a certain type of steel product produced by the production process.

[0032] The system boundaries of steel products have been clarified and the preset boundaries have been determined, including: Identify all processes and flows related to the production of steel products that can lead to the functions described. This includes all processes and material and energy flows involved in the production and manufacturing of steel products, from "gate" to "gate", including all stages of steel production and manufacturing, specifically raw material production and processing, steel production, rolling, and related auxiliary processes, as well as in-plant transportation.

[0033] Production process data and unit division process include: The production system includes sintering process, pelletizing process, coking process, ironmaking process, steelmaking process, hot rolling process and cold rolling process, and the unit process refers to the unit processes it contains.

[0034] The energy system and unit division process include: The energy system includes the power system, water system, oxygen system, thermal system, and gas system, and the unit processes are the unit processes included.

[0035] Among them, the input and output data of the unit process include: Data of all material flows (first input data / first output data) and energy flows (second input data / second output data) of the unit process. Material flows include raw materials (iron ore, iron concentrate, sintered ore, etc.) input to the unit process, auxiliary raw materials (limestone, dolomite, refractory materials, etc.), main products (molten iron, molten steel, etc.) and by-products (oxidized iron sheets, scrap steel, etc.) output from the unit process; energy flows include energy (washed coal, anthracite, coke, etc.) input to the unit process, energy media (electricity, coke oven gas, industrial water, etc.), energy and energy media output from the unit process.

[0036] Specifically, the main product and by-product refer to that when the unit process outputs only one product, the output product is the main product. When the unit process has multiple output products, the product that specifically matches the function of the unit process is called the main product, and the other products are called by-products.

[0037] In a possible implementation manner, the step of determining the process coefficient of the product to be evaluated in the production process according to the first input data and the first output data includes: characterizing the production unit process by a ratio of the first input data to the first output data; The proportional relationship between each production unit process and the preset functional unit is determined according to the number of main products in the first output data, and the proportional relationship is used as the process coefficient of the product to be evaluated in the production process.

[0038] For example, Figure 2 As shown, each unit process is represented as a ratio between a number of inputs and outputs. From the unit process of producing functional units, the upstream unit process is continuously traced back to obtain the number of products of each unit process after satisfying a given functional unit, and the proportional relationship between each unit process and the functional unit is obtained, that is, the process coefficient, then: The process coefficient of the first unit process P1 can be expressed as:

[0039] The process coefficient of the second unit process P2 can be expressed as:

[0040] The process coefficient of the third unit process P3 can be expressed as:

[0041] Therefore, the n Unit Process n The process coefficient can be expressed as:

[0042] in, R is the quantity of steel products, P1 is the production R The unit process of r i The unit process P i The quantity of the main product output, η i The unit process P i The ratio of the amount of raw materials input to the amount of main products output.

[0043] In a possible implementation, before the step of obtaining the second input data and the second output data of the energy unit process according to the energy flow relationship and calculating the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model, the step further includes: Obtain the power energy flow relationship of the power energy unit process in the energy system; Obtaining known carbon emission factors and known carbon offset factors, and establishing a power system carbon emission factor model based on the known carbon emission factors, the known carbon offset factors and the power energy flow relationship; The energy system is characterized according to the energy structure of the energy system through the power system carbon emission factor model to obtain the energy system carbon emission factor model.

[0044] For example, for different case enterprises, the energy structure of the energy system is different, and the carbon emission factors of various energy sources and energy media in the energy system are different. For example, the energy structure of the energy system of some enterprises includes at least one of the water system, thermal system, gas system, oxygen system, and power system, while the energy structure of the energy system of another part of enterprises only includes the power system.

[0045] Therefore, under the conditions that the quantitative conversion relationship between each energy flow in the known energy system is known, the carbon emission factors of the known energy include the carbon emission factors obtained by national statistics or calculated based on the actual measured components such as the purchased energy input into the energy system, the energy and energy media input from the production system to the energy system (purchased electricity emission factor, raw coal gas emission factor, etc.), and the carbon deduction factors of the known by-products include the carbon deduction factors obtained by national statistics or calculated based on the actual measured components (dust ash carbon deduction factor, analytical gas carbon deduction factor, etc.), a power system carbon emission factor model is constructed according to the energy conversion and flow relationship of the power system (the power energy flow relationship of the power energy unit process), and the power system carbon emission factor model is used to characterize the energy system according to the energy structure of the energy system to obtain the energy system carbon emission factor model.

[0046] In a possible implementation, the step of characterizing the energy system according to the energy structure of the energy system through the power system carbon emission factor model to obtain the energy system carbon emission factor model includes: Determining data on energy types produced by the energy system according to the energy structure of the energy system; Establishing a carbon emission factor model for each energy source in the form of the power system carbon emission factor model to obtain a carbon emission factor model group; The power system carbon emission factor model and the carbon emission factor model group are summed and combined to obtain an energy system carbon emission factor model.

[0047] Optionally, the energy system carbon emission factor model is:

[0048] Among them, for water systems x for a For thermal systems x for b For gas systems x for c For oxygen systems x for d For power systems x is 1, x When is 1, F 1 is the carbon emission factor of electricity consumption, p 1 is the total electricity consumption, I 1 is the first determinant of the quantities of various inputs when the energy produced is electrical energy, O 1 is the second determinant of the amount of various outputs when the energy produced is electrical energy, F is the third determinant of carbon emissions and carbon offset factors; ∘ is the Hadamard operator.

[0049] For example, the type of external input energy to the energy system is represented as f , the carbon emission factors are expressed as F en,1 , F en,2 , …, F en,f The type of by-products output by the energy system to the outside of the system is represented as g , the carbon deduction factors are expressed as F byp,1 , F byp,2 , …, F byp,g The total amount of purchased electricity is expressed as h , the carbon emission factor of purchased electricity is expressed as Fgr .

[0050] The number of water types produced by the water system is expressed as a ,set up F wa,1 , F wa,2 , …, F wa,a are the carbon emission factors of various types of water respectively. The number of steam types produced by the thermal system is expressed as b ,set up F st,1 , F st,2 , …, F st,b Represent the carbon emission factors of various types of steam respectively. The number of gas types produced by the gas system is expressed as c ,set up F byg,1 , F byg,2 , …, F byg,c Represent the carbon emission factors of various types of coal gas respectively. The number of gas types produced by the oxygen system is expressed as d ,set up F ga,1 , F ga,2 , …, F ga,d Represent the carbon emission factors of various gases respectively. The number of self-generated power types in the power system is expressed as e ,set up F se,1 , F se,2 , …, F se,e Represents the carbon emission factors of various types of self-generated electricity Furthermore, the emission factor of the total power output of the power system, that is, the emission factor of the power consumption of the whole plant, is calculated. p se It can be expressed as the sum of the self-generated electricity output of each power generation unit process.

[0051]

[0052] Among them, the emission factor of self-generation F se It can be expressed as the weighted average of the corresponding self-generation emission factors obtained from the respective power generation unit processes.

[0053]

[0054] In the formula, pse,1 , p se,2 , …, p se,e They are 1st, 2nd, ..., e The amount of self-generated electricity produced.

[0055] Among them, the total electricity consumption can be expressed as the sum of the total self-generated electricity and the total purchased electricity.

[0056]

[0057] Among them, the electricity emission factor F el It can be expressed as the weighted average of purchased electricity and self-generated electricity.

[0058]

[0059] For example, the calculation model of the carbon emission factor of each type of energy produced by the energy system can be expressed as the sum of the carbon footprint brought in or out by a unit of input or output:

[0060] In the formula, x Types of products produced for water systems, thermal systems, gas systems, etc. For water systems, thermal systems, gas systems, oxygen systems, power systems, x They are a , b , c , d , 1; i Indicates the type i products; F i For products i Carbon emission factors for water systems, thermal systems, gas systems, oxygen systems, and power systems. F They are F wa , F st , F byg , F ga , F el ; p i For products i The output of water system, thermal system, gas system, oxygen system and power system, p They are p wa , p st , p byg, p ga , p el ; I i To produce products i The determinant of the various input quantities; O i To produce products i The determinant of the quantities of various outputs; F is the determinant of carbon emissions and carbon offset factors; ∘ is the Hadamard operator.

[0061] Optionally, the step of obtaining the second input data and the second output data of the energy unit process according to the energy flow relationship, and calculating the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model includes: Determine the target energy type of the energy produced by the energy unit process according to the energy flow relationship, and obtain the first target determinant of the energy unit process according to the target energy type as the second input data; Obtaining a second target determinant of the energy unit process according to the target energy type as second output data; The self-generated energy carbon emission factor of the product to be evaluated is calculated based on a third target determinant corresponding to the target energy type, the second input data, the second output data and the energy system carbon emission factor model.

[0062] Specifically, the determinant of the quantity composition of each type of input (the second input data) can be expressed as:

[0063]

[0064] In the formula, I i1 arrive I im Production products i The amount of all inputs; I i1 arrive I ia To produce products i The amount of various products input into the water system; I i(a+1) arrive I i(a+b) To produce products i The amount of various products of the thermal system input at the time; I i(a+b+1) arrive I i(a+b+c) To produce productsi The amount of various products input into the gas system at that time; I i(a+b+c+1) arrive I i(a+b+c+d) To produce products i The amount of various products of the oxygen system input at the time; I i(a+b+c+d+1) arrive I i(a+b+c+d+f) To produce products i The amount of various energy sources input from outside the system; I i(a+b+c+d+f+1) To produce products i The amount of electricity used when input.

[0065] Specifically, the determinant of the quantity composition of each type of output (the second output data) can be expressed as:

[0066]

[0067] In the formula, O i1 arrive O im Production products i the amount of all output by-products; O i1 arrive O ia To produce products i The amount of various products of the water system output at a time; O i(a+1) arrive O i(a+b) To produce products i The amount of thermal products of various systems output at a time; O i(a+b+1) arrive O i(a+b+c) To produce products i The quantity of various system products of the gas system output at any time; O i(a+b+c+1) arrive O i(a+b+c+d) To produce products i The amount of various system products of the oxygen system output at a time; O i(a+b+c+d+1) arrive O i(a+b+c+d+g) To produce products i The amount of by-products outside the system output when O i(a+b+c+d+g+1) To produce products i The amount of electricity output at a time.

[0068] Specifically, the determinant of carbon emissions and carbon offset factors (the third target determinant) can be expressed as:

[0069] In the formula, F 1 to F m is the carbon emission factor corresponding to all inputs; F 1 to F n is the carbon emission factor corresponding to all outputs.

[0070] In a possible implementation, the step of obtaining the carbon footprint evaluation result of the product to be evaluated through a life cycle carbon footprint evaluation model based on the process coefficient, the self-produced energy carbon emission factor, the first input data, and the first output data includes: Calculate the unit process carbon footprint of the product to be evaluated based on the self-produced energy carbon emission factor; The carbon footprint of each unit process is multiplied by the process coefficient of each unit process, and then the sum is accumulated to obtain the total carbon footprint result of the product to be evaluated in the production process; The sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated is calculated by the life cycle carbon footprint evaluation model to obtain the carbon footprint evaluation result of the product to be evaluated.

[0071] For example, the calculated process coefficient and carbon emission factor are brought into the life cycle carbon footprint assessment model to obtain the carbon footprint calculation results of steel products, including: The carbon footprint of steel product production is the sum of the cumulative carbon footprint of steel products in the unit process (total carbon footprint result) and the carbon footprint of in-plant transportation, which can be specifically expressed as:

[0072] In the formula, C pro Accumulate carbon footprint results for the products of the unit processes (total carbon footprint results); C tran This is the carbon footprint result of the in-plant transportation process.

[0073] Specifically, the total carbon footprint result of the production process (total carbon footprint result) can be expressed as the cumulative sum of the unit process carbon footprint multiplied by the process coefficient.

[0074]

[0075] In the formula, c pro,i.j for P i,j Unit process carbon footprint; si,j The unit process P i,j The process coefficient.

[0076] The specific unit process carbon footprint can be expressed as the carbon footprint generated by the energy input in the unit process, the carbon footprint generated by the raw and auxiliary material input, and the carbon footprint offset by products and by-products.

[0077]

[0078] In the formula, c en the carbon footprint generated for energy input; c ma Carbon footprint generated for raw material input; c cr Carbon footprint offset for product and by-product output.

[0079] Specifically, the carbon footprint generated by the input energy can be expressed as the amount of each type of energy input into the unit process multiplied by the corresponding carbon emission factor and the cumulative sum.

[0080]

[0081] In the formula, q en Types of energy consumed by unit processes, including all types of purchased energy and energy input into the energy system; β en,k The first unit consumed by the unit process to produce a unit product k The amount of energy; F en,k The first input for the unit process k Carbon emission factors of various energy sources.

[0082] Specifically, the carbon emission factors of some energy sources are calculated based on the carbon content of energy input in actual production.

[0083]

[0084] In the formula, Q en It is the low calorific value, kJ / t or kJ / m 3 ;CONT en is the carbon content per unit calorific value, kgCO2e / kJ; δ is the carbon oxidation rate, %.

[0085] Specifically, the carbon footprint generated by the input of raw and auxiliary materials can be expressed as the amount of each type of raw and auxiliary materials input into the unit process multiplied by the corresponding carbon emission factor and the cumulative sum.

[0086]

[0087] In the formula, q ma The types of raw and auxiliary materials consumed by the unit process, including all types of carbon-containing raw materials and auxiliary materials; β ma,k The first unit consumed by the unit process to produce a unit product k The amount of raw materials and auxiliary materials; F ma,k The first input for the unit process k Carbon emission factors of various raw and auxiliary materials.

[0088] Specifically, the carbon emission factors of some raw and auxiliary materials are calculated based on the carbon content in the raw and auxiliary materials input in actual production.

[0089]

[0090] In the formula, CONT ma Carbon content of raw materials.

[0091] Specifically, the carbon offset of products and by-products is expressed as the amount of each type of product and by-product output of the unit process multiplied by the corresponding carbon offset factor and the cumulative sum.

[0092]

[0093] In the formula, q cr The types of output products and by-products for the unit process; β cr,k The first unit product output for the unit process k Quantity of products and by-products; F cr,k Output of the unit process k Carbon offset factors for various products and by-products.

[0094] Specifically, the carbon deduction factors of some products and by-products are calculated based on the carbon content of the products and by-products output in actual production.

[0095]

[0096] In the formula, CONT cr is the carbon content of products and by-products.

[0097] In a possible implementation manner, before the step of calculating the sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated by the life cycle carbon footprint evaluation model, the step further includes: According to a preset boundary, various modes of transportation of raw materials within the preset boundary, and transportation carbon emission factors and transportation distance data of transporting the raw materials per unit distance by various modes of transportation are obtained; Calculate the total transport carbon emission factor for all transport modes based on the transport carbon emission factor, the transport distance data and the correction factor; The transportation carbon footprint of the product to be evaluated is calculated based on the total transportation carbon emission factor and the process coefficient.

[0098] For example, the in-plant transportation process carbon footprint (transportation carbon footprint) can be expressed as the cumulative sum of the transportation process carbon footprint multiplied by the process coefficient of the corresponding downstream unit process.

[0099]

[0100] In the formula, c tran,i,j is the input to the unit process P i,j The carbon footprint of the raw material transportation stage within the system boundary.

[0101]

[0102] In the formula, q tran The type of raw materials consumed by the unit process within the system boundary; F tran,k The first k Carbon emission factors for the transportation phase of raw materials within the system boundary.

[0103]

[0104] In the formula, z tran It is the mode of transportation of raw materials within the system boundary; f tran,k For k is the carbon emission factor per unit distance of raw materials within the system boundary of the transport unit of the transport mode; L tran,k For k is the transport distance within the system boundary of the transport mode; t Indicates the no-load correction factor. The carbon emissions when no-load is 0.67 times that when fully loaded. t Take 1, no-load t Take 0.67.

[0105] On the other hand, Figure 3 As shown, the present application provides a carbon footprint assessment system for steel products, the system comprising: The data acquisition module 201 is used to obtain the production process data of the product to be evaluated, and the energy flow data of the energy system that supplies energy for the production process of the product to be evaluated, and determine the production unit process of the product to be evaluated and the production flow relationship of each production unit process according to the production process data, and determine the energy unit process of the energy system and the energy flow relationship of each energy unit process according to the energy flow data; A first calculation module 202 is used to obtain the second input data and the second output data of the energy unit process according to the energy flow relationship, and calculate the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model; A second calculation module 203 is used to obtain the first input data and the first output data of the production unit process according to the production flow relationship, and determine the process coefficient of the product to be evaluated in the production process according to the first input data and the first output data; The evaluation module 204 is used to obtain the carbon footprint evaluation result of the product to be evaluated through a life cycle carbon footprint evaluation model based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data.

[0106] Thirdly, Figure 4 As shown, an embodiment of the present application provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory and executable on the processor, wherein when the processor executes the computer program, the following steps are implemented: obtaining production process data of a product to be evaluated, and energy flow data of an energy system that supplies energy for the production process of the product to be evaluated, and determining the production flow relationship between the production unit process of the product to be evaluated and each production unit process according to the production process data, and determining the energy flow relationship between the energy unit process of the energy system and each energy unit process according to the energy flow data; obtaining second input data and second output data of the energy unit process according to the energy flow relationship, and calculating the self-produced energy carbon emission factor of the product to be evaluated through an energy system carbon emission factor model; obtaining first input data and first output data of the production unit process according to the production flow relationship, and determining the process coefficient of the product to be evaluated in the production process according to the first input data and the first output data; and obtaining the carbon footprint evaluation result of the product to be evaluated through a life cycle carbon footprint evaluation model based on the process coefficient, the self-produced energy carbon emission factor, the first input data, and the first output data.

[0107] Fourthly, Figure 5As shown, an embodiment of the present application provides a computer-readable storage medium 400, and the computer-readable storage medium stores a computer program 411. When the computer program is executed by a processor, the following steps are implemented: obtaining production process data of the product to be evaluated, and energy flow data of the energy system that supplies energy for the production process of the product to be evaluated, and determining the production flow relationship between the production unit process of the product to be evaluated and each production unit process according to the production process data, and determining the energy flow relationship between the energy unit process of the energy system and each energy unit process according to the energy flow data; obtaining second input data and second output data of the energy unit process according to the energy flow relationship, and calculating the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model; obtaining first input data and first output data of the production unit process according to the production flow relationship, and determining the process coefficient of the product to be evaluated in the production process according to the first input data and the first output data; based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data, the carbon footprint evaluation result of the product to be evaluated is obtained through the life cycle carbon footprint evaluation model.

[0108] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0109] In the embodiments provided in the present application, it should be understood that the disclosed systems / network devices / terminal devices and methods can be implemented in other ways. For example, the system / network device / terminal device embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the system or unit can be electrical, mechanical or other forms.

[0110] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0111] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for evaluating the carbon footprint of steel products, characterized in that: include: Obtaining production process data of the product to be evaluated and energy flow data of the energy system that supplies energy for the production process of the product to be evaluated, and determining the production unit process of the product to be evaluated and the production flow relationship between each production unit process based on the production process data, and determining the energy unit process of the energy system and the energy flow relationship between each energy unit process based on the energy flow data; Acquire the second input data and the second output data of the energy unit process according to the energy flow relationship, and calculate the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model; Acquire first input data and first output data of the production unit process according to the production flow relationship, and determine the process coefficient of the product to be evaluated in the production process according to the first input data and the first output data; Based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data, a carbon footprint evaluation result of the product to be evaluated is obtained through a life cycle carbon footprint evaluation model.

2. The carbon footprint evaluation method for steel products according to claim 1, characterized in that: The step of determining the process coefficient of the product to be evaluated in the production process according to the first input data and the first output data comprises: characterizing the production unit process by a ratio of the first input data to the first output data; The proportional relationship between each production unit process and the preset functional unit is determined according to the number of main products in the first output data, and the proportional relationship is used as the process coefficient of the product to be evaluated in the production process.

3. The carbon footprint evaluation method for steel products according to claim 1, characterized in that: Before the step of obtaining the second input data and the second output data of the energy unit process according to the energy flow relationship and calculating the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model, the step further includes: Obtain the power energy flow relationship of the power energy unit process in the energy system; Obtaining known carbon emission factors and known carbon offset factors, and establishing a power system carbon emission factor model based on the known carbon emission factors, the known carbon offset factors and the power energy flow relationship; The energy system is characterized according to the energy structure of the energy system through the power system carbon emission factor model to obtain the energy system carbon emission factor model.

4. A carbon footprint assessment method for steel products according to claim 3, characterized in that: The step of characterizing the energy system according to the energy structure of the energy system through the power system carbon emission factor model to obtain the energy system carbon emission factor model comprises: Determining data on energy types produced by the energy system according to the energy structure of the energy system; Establishing a carbon emission factor model for each energy source in the form of the power system carbon emission factor model to obtain a carbon emission factor model group; The power system carbon emission factor model and the carbon emission factor model group are summed and combined to obtain an energy system carbon emission factor model.

5. A carbon footprint assessment method for steel products according to claim 4, characterized in that: The energy system carbon emission factor model is: Among them, for water systems x for a For thermal systems x for b For gas systems x for c For oxygen systems x for d For power systems x is 1, x When is 1, F 1 is the carbon emission factor of electricity consumption, p 1 is the total electricity consumption, I 1 is the first determinant of the quantities of various inputs when the energy produced is electrical energy, O 1 is the second determinant of the amount of various outputs when the energy produced is electrical energy, F is the third determinant of carbon emissions and carbon offset factors; ∘ is the Hadamard operator.

6. A carbon footprint assessment method for steel products according to claim 5, characterized in that: The step of obtaining the second input data and the second output data of the energy unit process according to the energy flow relationship, and calculating the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model includes: Determine the target energy type of the energy produced by the energy unit process according to the energy flow relationship, and obtain the first target determinant of the energy unit process according to the target energy type as the second input data; Obtaining a second target determinant of the energy unit process according to the target energy type as second output data; The self-generated energy carbon emission factor of the product to be evaluated is calculated based on a third target determinant corresponding to the target energy type, the second input data, the second output data and the energy system carbon emission factor model.

7. The carbon footprint evaluation method for steel products according to claim 1, characterized in that: The step of obtaining the carbon footprint evaluation result of the product to be evaluated through a life cycle carbon footprint evaluation model based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data comprises: Calculate the unit process carbon footprint of the product to be evaluated based on the self-produced energy carbon emission factor, the first input data and the first output data; The carbon footprint of each unit process is multiplied by the process coefficient of each unit process, and then the sum is accumulated to obtain the total carbon footprint result of the product to be evaluated in the production process; The sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated is calculated by the life cycle carbon footprint evaluation model to obtain the carbon footprint evaluation result of the product to be evaluated.

8. The carbon footprint evaluation method for steel products according to claim 1, characterized in that: Before the step of calculating the sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated by the life cycle carbon footprint evaluation model, the step further includes: According to a preset boundary, various modes of transportation of raw materials within the preset boundary, and transportation carbon emission factors and transportation distance data of transporting the raw materials per unit distance by various modes of transportation are obtained; Calculate the total transport carbon emission factor for all transport modes based on the transport carbon emission factor, the transport distance data and the correction factor; The transportation carbon footprint of the product to be evaluated is calculated based on the total transportation carbon emission factor and the process coefficient.

9. The carbon footprint assessment system for steel products is characterized by: The system comprises: A data acquisition module is used to obtain the production process data of the product to be evaluated, and the energy flow data of the energy system that supplies energy for the production process of the product to be evaluated, and determine the production unit process of the product to be evaluated and the production flow relationship of each production unit process according to the production process data, and determine the energy unit process of the energy system and the energy flow relationship of each energy unit process according to the energy flow data; A first calculation module is used to obtain the second input data and the second output data of the energy unit process according to the energy flow relationship, and calculate the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model; A second calculation module, used for obtaining first input data and first output data of the production unit process according to the production flow relationship, and determining a process coefficient of the product to be evaluated in the production process according to the first input data and the first output data; An evaluation module is used to obtain a carbon footprint evaluation result of the product to be evaluated through a life cycle carbon footprint evaluation model based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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