Iron and steel product carbon footprint evaluation method and system

Abstract

The present invention is applicable to the technical field of carbon reduction and energy saving, and provides an iron and steel product carbon footprint evaluation method and system. The method comprises: acquiring production process data of a product to be evaluated and energy flow data, determining production unit processes of said product on the basis of the production process data, and determining energy unit processes of said product on the basis of the energy flow data; on the basis of second input data and second output data of the energy unit processes, calculating, by means of an energy system carbon emission factor model, a self-produced energy carbon emission factor of said product; acquiring first input data and first output data of the production unit processes, and on the basis of the first input data and the first output data, determining a process coefficient of said product in a production process; and on the basis of the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data, obtaining, by means of a life cycle carbon footprint evaluation model, a carbon footprint evaluation result of said product.

Description

A method and system for evaluating the carbon footprint of steel products Technical Field

[0001] This invention belongs to the field of carbon reduction and energy conservation technology, and in particular relates to a method and system for evaluating the carbon footprint of steel products. Background Technology

[0002] Green and low-carbon development has become a top priority for the transformation and upgrading of the steel industry. Steel companies themselves should improve their carbon footprint assessment methodologies to gain a deeper understanding of steel product structure and emission indicators, continuously optimize production processes and product structure, and enhance their carbon emission reduction competitiveness.

[0003] Current carbon footprint calculations at the steel industry level often lack specificity and accuracy, failing to reflect the actual production conditions of steel enterprises. This makes it difficult to effectively coordinate and control carbon footprint assessments by integrating actual production carbon emission data. Specifically, existing life-cycle carbon footprint calculation models primarily use material flow to linearly connect upstream and downstream processes, focusing only on crude steel products or major steel product categories. However, in actual production, a single steel enterprise often produces numerous types of steel products, with different production routes for different types across different equipment, resulting in carbon footprints that differ from those of major steel product categories. Furthermore, current carbon footprint calculation methods often rely directly on databases for energy and energy medium emission factors. The values ​​of emission factors vary across different databases, and the significant uncertainty caused by different sources leads to inaccurate, difficult-to-compare, and difficult-to-interpret carbon footprint calculations. In the steel production process, the direct or indirect carbon footprint varies depending on the source of the same energy source. Purchased energy and energy byproducts from the production system undergo different forms of energy conversion after entering the energy system. Therefore, the carbon footprint of the energy system's output of self-produced energy is determined by the energy conversion relationships between various equipment within the energy system. The energy system is a crucial component of the steel production system and is closely related to it. Models that do not include the energy system in the entire steel production process cannot fully reflect the differences in carbon footprint caused by the specific conversion relationships of various types of energy during steel production. They also do not conform to the actual flow patterns of materials and energy in steel production, resulting in significant discrepancies between the calculated carbon footprint of steel products and actual production.

[0004] Summary of the Invention

[0005] This invention provides a method and system for evaluating the carbon footprint of steel products, which can solve the problem that the carbon footprint calculation results of steel products differ greatly from the actual production in the prior art.

[0006] In a first aspect, the present invention provides a method for evaluating the carbon footprint of steel products, comprising:

[0007] The production process data of the product to be evaluated and the energy flow data of the energy system that supplies energy to the production process of the product to be evaluated are obtained. Based on the production process data, the production unit process of the product to be evaluated and the production flow relationship of each production unit process are determined. Based on the energy flow data, the energy unit process of the energy system and the energy flow relationship of each energy unit process are determined.

[0008] Based on the energy flow relationship, the second input data and the second output data of the energy unit process are obtained, and the self-produced energy carbon emission factor of the product to be evaluated is calculated through the energy system carbon emission factor model.

[0009] The first input data and the first output data of the production unit process are obtained according to the production flow relationship, and the process coefficient of the product to be evaluated in the production process is determined according to the first input data and the first output data.

[0010] Based on the process coefficient, the self-generated 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.

[0011] Optionally, the step of determining the process coefficients of the product to be evaluated during the production process based on the first input data and the first output data includes:

[0012] The production unit process is characterized by the ratio of the first input data to the first output data.

[0013] The proportional relationship between each production unit process and the preset functional unit is determined based on 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.

[0014] Optionally, before the step of obtaining the second input data and second output data of the energy unit process based on 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 method further includes:

[0015] To obtain the electrical energy flow relationship of electrical energy units in an energy system;

[0016] Obtain known carbon emission factors and known carbon deduction factors, and establish a power system carbon emission factor model based on the known carbon emission factors, known carbon deduction factors, and the power energy flow relationship;

[0017] The energy system carbon emission factor model is obtained by characterizing the energy system according to its energy structure using the power system carbon emission factor model.

[0018] Optionally, the step of obtaining the energy system carbon emission factor model by characterizing the energy system according to the energy structure of the energy system using the power system carbon emission factor model includes:

[0019] Determine the types of energy produced by the energy system based on its energy structure.

[0020] A carbon emission factor model for each energy source is established in the form of the power system carbon emission factor model, resulting in a carbon emission factor model set;

[0021] The carbon emission factor model of the power system and the set of carbon emission factor models are summed and combined to obtain the carbon emission factor model of the energy system.

[0022] Optionally, the carbon emission factor model for the energy system is:

[0023] Where x is a for water system, b for heat system, c for gas system, d for oxygen system, and 1 for power system, when x is 1, F1 is the carbon emission factor for electricity consumption, p1 is the total electricity consumption, I1 is the first determinant composed of various input quantities when the energy produced is electrical energy, O1 is the second determinant composed of various output quantities when the energy produced is electrical energy, F is the third determinant of carbon emission and carbon offset factors; ° is the Hadamard operator.

[0024] Optionally, the step of obtaining the second input data and second output data of the energy unit process based on 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:

[0025] The target energy type of the energy produced by the energy unit process is determined based on the energy flow relationship, and the first target determinant of the energy unit process is obtained based on the target energy type as the second input data.

[0026] The second target determinant of the energy unit process is obtained according to the target energy type, and used as the second output data;

[0027] The self-produced energy carbon emission factor of the product to be evaluated is calculated based on the 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.

[0028] Optionally, the step of obtaining the carbon footprint assessment result of the product to be evaluated based on the process coefficient and the self-generated energy carbon emission factor through a life cycle carbon footprint assessment model includes:

[0029] Calculate the unit process carbon footprint of the product to be evaluated based on the self-generated energy carbon emission factor, the first input data, and the first output data.

[0030] The total carbon footprint of the product under evaluation in the production process is obtained by multiplying the carbon footprint of each unit process and the process coefficient of each unit process, and then summing them up.

[0031] The carbon footprint evaluation result of the product to be evaluated is obtained by calculating the sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated using the life cycle carbon footprint evaluation model.

[0032] 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 using the life cycle carbon footprint assessment model, the method further includes:

[0033] Based on a preset boundary, various transportation methods for raw materials within the preset boundary are obtained, along with the transportation carbon emission factor and transportation distance data for each unit distance traveled by the raw materials in each transportation method.

[0034] The total transport carbon emission factor for all modes of transport is calculated based on the transport carbon emission factor, the transport distance data, and the correction factor.

[0035] The transportation carbon footprint of the product to be evaluated is calculated based on the total transportation carbon emission factor and the process coefficient.

[0036] On the other hand, the present invention provides a carbon footprint assessment system for steel products, the system comprising:

[0037] The data acquisition module is used to acquire production process data of the product to be evaluated, and energy flow data of the energy system that supplies energy to the production process of the product to be evaluated, and to determine the production unit process and production flow relationship of each production unit process of the product to be evaluated based on the production process data, and to determine the energy unit process and energy flow relationship of each energy unit process of the energy system based on the energy flow data.

[0038] The 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 to calculate the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model.

[0039] The second calculation module 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 to 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.

[0040] The evaluation module is used to obtain the carbon footprint evaluation result of the product to be evaluated based on the process coefficient, the self-generated energy carbon emission factor, the first input data and the first output data, through the life cycle carbon footprint evaluation model.

[0041] Thirdly, embodiments of the present invention provide a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described above.

[0042] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described above.

[0043] The advantages of this invention compared to the prior art are:

[0044] This paper assesses the carbon footprint of steel products by combining the actual energy flow conversion and flow relationships within the energy system. By analyzing the energy flow conversion relationships within unit processes of the energy system and their flow relationships between different unit processes, carbon emission factor models for each produced energy and energy medium of the energy system are obtained. The carbon emission factors of the plant's self-produced energy are then solved using these models. By combining the conversion relationships of material and energy flows within the production system and their flow relationships between different unit processes during steel production, this paper achieves the ability to obtain the carbon emission factors of all self-produced energy when the energy flow and conversion relationships of unit processes within the plant's energy system are known. This overcomes the shortcomings of existing methods that rely on energy emission factors from databases, resulting in inaccurate carbon footprint assessments. This approach achieves a more accurate, targeted, and realistic calculation of the life-cycle carbon footprint of steel products. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 is a flowchart illustrating a method for evaluating the carbon footprint of steel products according to an embodiment of this application;

[0047] Figure 2 is a flowchart illustrating a method for evaluating the carbon footprint of steel products according to another embodiment of this application;

[0048] Figure 3 is a schematic diagram of the structure of a carbon footprint assessment system for steel products provided in an embodiment of this application;

[0049] Figure 4 is a structural block diagram of an electronic device in one embodiment;

[0050] Figure 5 is a structural block diagram of a computer storage medium in another embodiment. Detailed Implementation

[0051] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0052] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0053] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0054] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0055] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0056] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0057] Figure 1 shows a schematic flowchart of the carbon footprint assessment method for steel products provided in this application. An embodiment of this application provides a carbon footprint assessment method for steel products, including:

[0058] S101. Obtain production process data of the product to be evaluated, and energy flow data of the energy system that supplies energy to 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 based on the production process data, and determine the energy unit process of the energy system and the energy flow relationship of each energy unit process based on the energy flow data.

[0059] For example, the production process of the product to be evaluated is divided into a production system and an energy system. Production process data of the product to be evaluated is obtained based on the production system, and energy flow data of the energy system is obtained.

[0060] S102. 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.

[0061] S103. 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.

[0062] S104. Based on the process coefficient, the self-generated 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.

[0063] This paper assesses the carbon footprint of steel products by combining the actual energy flow conversion and flow relationships within the energy system. By analyzing the energy flow conversion relationships within unit processes of the energy system and their flow relationships between different unit processes, carbon emission factor models for each produced energy and energy medium of the energy system are obtained. The carbon emission factors of the plant's self-produced energy are then solved using these models. By combining the conversion relationships of material and energy flows within the production system and their flow relationships between different unit processes during steel production, this paper achieves the ability to obtain the carbon emission factors of all self-produced energy when the energy flow and conversion relationships of unit processes within the plant's energy system are known. This overcomes the shortcomings of existing methods that rely on energy emission factors from databases, resulting in inaccurate carbon footprint assessments. This approach achieves a more accurate, targeted, and realistic calculation of the life-cycle carbon footprint of steel products.

[0064] In one possible implementation, before the steps of acquiring production process data of the product to be evaluated, and energy flow data of the energy system supplying energy to the production process of the product to be evaluated, and determining the production unit process and production flow relationship of each production unit process based on the production process data, and determining the energy unit process and energy flow relationship of the energy system based on the energy flow data, the method further includes:

[0065] Define clear targets for assessing the carbon footprint of steel products, including:

[0066] This study quantifies the energy and resource-related inputs and outputs during the production of major categories or specific types of steel products within steel enterprises, and evaluates the carbon footprint of steel products in this process. This provides enterprises with a basis for quantifying the carbon footprint of steel products, improving production processes, and promoting low-carbon transformation and development.

[0067] Specifically, the specific type of steel product includes a certain type of steel product obtained by meticulously classifying steel products according to production process (such as cold / hot rolled products), processing technology (baffle annealing / continuous annealing), shape (such as round bar / square bar), size (such as hot rolled thin steel strip / medium-thick plate), properties (such as plasticity / hardness), and uses (such as automotive materials / building materials).

[0068] Define the functional units for assessing the carbon footprint of steel products, including:

[0069] By clearly defining the functions and roles of the steel product production system, a unit of measurement can be obtained that quantitatively links the inputs and outputs of all unit processes and facilitates functional comparison. In the steel product system, a unit process is typically one unit of a certain type of steel product produced in the production flow.

[0070] The system boundaries of steel products have been clearly defined, and the pre-defined boundaries include:

[0071] Identify all processes and flows related to steel product production that can lead to the aforementioned function. This includes all stages of steel product manufacturing, from "gate to gate," specifically raw material processing, steel production, rolling, related auxiliary processes, and all processes and material and energy flows involved in in-plant transportation.

[0072] Production process data and unit division processes include:

[0073] The production system includes sintering, pelletizing, coking, ironmaking, steelmaking, hot rolling, and cold rolling processes. A unit process is the individual unit processes it contains.

[0074] The energy system and the process of dividing the system into units include:

[0075] The energy system includes the power system, water system, oxygen system, heat system, and gas system, and the unit process is the individual unit process contained within it.

[0076] The input and output data of the unit process include:

[0077] Data on 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, sinter, etc.) and auxiliary raw materials (limestone, dolomite, refractory materials, etc.) input to the unit process, main products (molten iron, molten steel, etc.) and by-products (iron oxide scale, 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.), and energy and energy media output from the unit process.

[0078] Specifically, the terms "primary product" and "secondary product" refer to the following: when a unit process outputs only one product, the output product is the primary product. When a unit process outputs multiple products, the product with a specific function that matches the unit process is called the primary product, and the other products are called secondary products.

[0079] In one possible implementation, the step of determining the process coefficients of the product to be evaluated during the production process based on the first input data and the first output data includes:

[0080] The production unit process is characterized by the ratio of the first input data to the first output data.

[0081] The proportional relationship between each production unit process and the preset functional unit is determined based on 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.

[0082] For example, as shown in Figure 2, each unit process is represented as a ratio between several inputs and outputs. By tracing upstream unit processes from the unit process producing a functional unit, the product quantity of each unit process after satisfying a given functional unit is obtained. This yields the proportional relationship between each unit process and the functional unit, i.e., the process coefficient, which is:

[0083] The process coefficient of process P1 in the first unit can be expressed as: s1 = 1

[0084] The process coefficients of process P2 in the second unit can be expressed as:

[0085] The process coefficients of process P3 in Unit 3 can be expressed as:

[0086] Therefore, the nth unit process P n The process coefficients can be expressed as:

[0087] Where R is the quantity of steel products, P1 is the unit process that produces R, and r i Unit process P i Output the number of main products, η i Unit process P i The ratio of the quantity of input raw materials to the quantity of output main products.

[0088] In one possible implementation, before the step of obtaining the second input data and second output data of the energy unit process based on 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 method further includes:

[0089] To obtain the electrical energy flow relationship of electrical energy units in an energy system;

[0090] Obtain known carbon emission factors and known carbon deduction factors, and establish a power system carbon emission factor model based on the known carbon emission factors, known carbon deduction factors, and the power energy flow relationship;

[0091] The energy system carbon emission factor model is obtained by characterizing the energy system according to its energy structure using the power system carbon emission factor model.

[0092] For example, the energy structure of the energy system varies for different companies, and the carbon emission factors of each energy source and energy medium in the energy system are different. For instance, the energy structure of some companies' energy systems includes at least one of water systems, heat systems, gas systems, oxygen systems, and power systems, while the energy structure of other companies' energy systems only includes power systems.

[0093] Therefore, given the known quantitative conversion relationships between energy flows in the energy system, and the known carbon emission factors of energy, including purchased energy input into the energy system, energy input from the production system to the energy system, and carbon emission factors calculated based on national statistics or measured components (purchased electricity emission factors, waste coal gas emission factors, etc.), and the known carbon deduction factors of by-products, including carbon deduction factors calculated based on national statistics or measured components (dust ash carbon deduction factors, desorption gas carbon deduction factors, etc.), a power system carbon emission factor model is constructed based on the energy conversion and flow relationships of the power system (the power energy flow relationships of power energy unit processes). The power system carbon emission factor model is then used to characterize the energy system according to its energy structure, resulting in the energy system carbon emission factor model.

[0094] In one possible implementation, the step of obtaining the energy system carbon emission factor model by characterizing the energy system according to the energy structure of the energy system using the power system carbon emission factor model includes:

[0095] Determine the types of energy produced by the energy system based on its energy structure.

[0096] A carbon emission factor model for each energy source is established in the form of the power system carbon emission factor model, resulting in a carbon emission factor model set;

[0097] The carbon emission factor model of the power system and the set of carbon emission factor models are summed and combined to obtain the carbon emission factor model of the energy system.

[0098] Optionally, the carbon emission factor model for the energy system is:

[0099] Where x is a for water system, b for heat system, c for gas system, d for oxygen system, and 1 for power system, when x is 1, F1 is the carbon emission factor for electricity consumption, p1 is the total electricity consumption, I1 is the first determinant composed of various input quantities when the energy produced is electrical energy, O1 is the second determinant composed of various output quantities when the energy produced is electrical energy, F is the third determinant of carbon emission and carbon offset factors; ° is the Hadamard operator.

[0100] For example, the type of energy input from outside the energy system is represented as f, and the carbon emission factor is represented as F. en,1 F en,2 F en,f Let g represent the type of byproducts that the energy system outputs to other systems, and let F represent the carbon offset factors. byp,1 F byp,2F byp,g Let the total amount of purchased electricity be expressed as h, and the carbon emission factor of purchased electricity be expressed as F. gr .

[0101] Let a represent the quantity of water produced by the water system, and let F be the quantity of water types produced by the water system. wa,1 F wa,2 F wa,a Let f(x) represent the carbon emission factors for various types of water. Let b represent the quantity of steam produced by the thermal system, and let F0 be the carbon emission factor for each type of water. st,1 F st,2 F st,b Let F represent the carbon emission factors for each type of steam. Let c represent the quantity of different types of gas produced by the gasification system, and let F... byg,1 F byg,2 F byg,c Let represent the carbon emission factors of each type of gas. Let d represent the quantity of each gas type produced by the oxygen system, and let F... ga,1 F ga,2 F ga,d Let f represent the carbon emission factors for each type of gas. Let e ​​represent the number of self-generated power types in the power system, and let F be the carbon emission factor. se,1 F se,2 F se,e These represent the carbon emission factors for various types of self-generated electricity.

[0102] Furthermore, the emission factor of the total output power of the power system is calculated, which is the emission factor of the total power consumption of the plant. Among these, the total self-generated power p... se It can be expressed as the sum of the self-generated electricity output of each of the power generation units.

[0103] Among them, the self-generated emission factor F se It can be expressed as the weighted average of the corresponding self-generated emission factors obtained from the respective power generation unit processes.

[0104] In the formula, p se,1 p se,2 , ..., p se,e These represent the output of the first, second, ..., e type of self-generated electricity, respectively.

[0105] The total electricity consumption can be expressed as the sum of self-generated electricity and purchased electricity. el =p se +h

[0106] Among them, the electricity emission factor F el It can be expressed as a weighted average of purchased electricity and self-generated electricity.

[0107] For example, a calculation model for the carbon emission factor of an energy system producing various types of energy can be expressed as the sum of the carbon footprint carried in or out per unit input or output:

[0108] In the formula, x represents the type of product produced by the water system, heating system, gas system, etc. For water system, heating system, gas system, oxygen system, and power system, x is a, b, c, d, and 1, respectively; i represents the product of type i; F i Let F be the carbon emission factor of product i. For water systems, heating systems, gas systems, oxygen systems, and power systems, F is Fi, respectively. wa F st F byg F ga F el ;p i Let p be the output of product i. For water system, heating system, gas system, oxygen system, and power system, p is respectively p wa p st p byg p ga p el ;I i The determinant of various input quantities when producing product i; O i F is the determinant of the various output quantities when producing product i; F is the determinant of carbon emissions and carbon offset factors; ° is the Hadamard operator.

[0109] Optionally, the step of obtaining the second input data and second output data of the energy unit process based on 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:

[0110] The target energy type of the energy produced by the energy unit process is determined based on the energy flow relationship, and the first target determinant of the energy unit process is obtained based on the target energy type as the second input data.

[0111] The second target determinant of the energy unit process is obtained according to the target energy type, and used as the second output data;

[0112] The self-produced energy carbon emission factor of the product to be evaluated is calculated based on the 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.

[0113] Specifically, the determinant (second input data) composed of various input quantities can be represented as: I i =[I i1 …I im ] = [Ii1 …I ia |I i(a+1) …I i(a+b) # |I i(a+b+1) …I i(a+b+c) |I i(a+b+c+1) …I i(a+b+c+d) |I i(a+b+c+d+1) …I i(a+b+c+d+f) |I i(a+b+c+d+f+1) # m=a+b+c+d+f+1

[0114] In the formula, I i1 To I im Let I represent all the input quantities for producing product i; i1 To I ia The quantity of various products input into the water system when producing product i; I i(a+1) To I i(a+b) The quantities of various products input into the thermal system when producing product i; I i(a+b+1) To I i(a+b+c) The quantity of various products input into the gas system during the production of product i; I i(a+b+c+1) To I i(a+b+c+d) The amount of various products input into the oxygen system during the production of product i; I i(a+b+c+d+1) To I i(a+b+c+d+f) The amount of various types of energy input from outside the system when producing product i; I i(a+b+c+d+f+1) The amount of electricity input during the production of product i.

[0115] Specifically, the determinant of the various output quantities (second output data) can be represented as: O i =[O i1 …O in ]# = [O i1 …O ia |O i(a+1) …O i(a+b) |O i(a+b+1) …O i(a+b+c) |O i(a+b+c+1) …O i(a+b+c+d) |O i(a+b+c+d+1) …O i(a+b+c+d+g) |O i(a+b+c+d+g+1) n = a + b + c + d + g + 1

[0116] In the formula, O i1 To O im Let O represent the quantities of all by-products produced from product i; i1 To O ia The quantity of various products output from the water system during the production of product i; O i(a+1) To O i(a+b) The quantity of various system products output during the production of product i; Oi(a+b+1) To O i(a+b+c) The quantity of various system products output by the gas system during the production of product i; O i(a+b+c+1) To O i(a+b+c+d) The amount of oxygen produced by various systems in the oxygen system during the production of product i; O i(a+b+c+d+1) To O i(a+b+c+d+g) O represents the amount of external by-products output during the production of product i; i(a+b+c+d+g+1) This refers to the amount of electricity consumed during the production of product i.

[0117] Specifically, the determinant of carbon emissions and carbon offset factors (the third target determinant) can be expressed as: F = [F1…F m |F1…F n ]# = [F wa,1 …F wa,a |F st,1 …F st,b |F byg,1 …F byg,c # |F ga,1 …F ga,d |F en,1 …F en,f |F el # |F wa,1 …F wa,a |F st,1 …F st,b |F byg,1 …F byg,c # |F ga,1 …F ga,d |F byp,1 …F byp,g |F el #

[0118] In the formula, F1 to F m Carbon emission factors corresponding to all inputs; F1 to F n The carbon emission factor corresponding to all outputs.

[0119] In one possible implementation, the step of obtaining the carbon footprint assessment result of the product to be evaluated based on the self-generated energy carbon emission factor, the first input data, and the first output data through a life cycle carbon footprint assessment model includes:

[0120] Calculate the unit process carbon footprint of the product to be evaluated based on the self-produced energy carbon emission factor;

[0121] The total carbon footprint of the product under evaluation in the production process is obtained by multiplying the carbon footprint of each unit process and the process coefficient of each unit process, and then summing them up.

[0122] The carbon footprint evaluation result of the product to be evaluated is obtained by calculating the sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated using the life cycle carbon footprint evaluation model.

[0123] For example, by substituting the calculated process coefficients and carbon emission factors into the life cycle carbon footprint assessment model, the carbon footprint calculation results for steel products include:

[0124] The carbon footprint of steel product production is the sum of the cumulative carbon footprint (total carbon footprint) of steel products in each unit process and the carbon footprint of in-plant transportation, which can be specifically expressed as: C dir =C pro +C tran

[0125] In the formula, C pro The cumulative carbon footprint result of the unit process product (total carbon footprint result); C tran The results show the carbon footprint of the transportation process within the plant.

[0126] Specifically, the total carbon footprint of the production process (total carbon footprint result) can be expressed as the sum of the carbon footprint of each unit process multiplied by the process coefficient.

[0127] In the formula, c pro,i,j For P i,j Unit process carbon footprint; s i,j Unit process P i,j The process coefficient.

[0128] The specific carbon footprint of a unit process can be expressed as the carbon footprint generated by energy input, raw material input, and carbon footprint deducted from products and by-products during the unit process. pro =c en +c ma -c cr

[0129] In the formula, c en The carbon footprint generated by energy input; c ma The carbon footprint generated by raw material inputs; c cr Carbon footprint offset for products and by-products.

[0130] Specifically, the carbon footprint generated by input energy can be expressed as the amount of each type of energy input to the unit process multiplied by the corresponding carbon emission factor and summed up.

[0131] In the formula, q en The energy type consumed by a unit process includes all types of purchased energy and energy input to the energy system; β en,k F represents the amount of the k-th type of energy consumed per unit of product produced by a unit process.en,k The carbon emission factor of the k-th energy source is input to the unit process.

[0132] Specifically, the carbon emission factor for some energy sources is calculated from the carbon content of the energy input in actual production. en =Q en ×CONT en ×δ×44 / 12

[0133] In the formula, Q en Lower heating value, kJ / t or kJ / m 3 CONT en The carbon content per unit calorific value is expressed as kgCO2e / kJ; δ represents the carbon oxidation rate, in percentages.

[0134] Specifically, the carbon footprint generated by the input raw and auxiliary materials can be expressed as the quantity of each type of raw material and auxiliary material input to the unit process multiplied by the corresponding carbon emission factor and summed up.

[0135] In the formula, q ma The types of raw and auxiliary materials consumed in the unit process, including all types of carbon-containing raw materials and auxiliary materials; β ma,k F represents the amount of the k-th raw material consumed per unit of product produced by a unit process; ma,k The carbon emission factor of the kth raw material input to the unit process.

[0136] Specifically, the carbon emission factor of some raw and auxiliary materials is calculated from the carbon content of the raw and auxiliary materials input in actual production. ma =CONT ma ×44 / 12

[0137] In the formula, CONT ma This refers to the carbon content of the raw materials.

[0138] Specifically, the carbon deduction for products and by-products is expressed as the quantity of each type of product and by-product output from the unit process multiplied by the corresponding carbon deduction factor and then summed.

[0139] In the formula, q cr The types of output products and by-products of a unit process; β cr,k F represents the quantity of the k-th product and by-product output per unit product in a unit process; cr,k The carbon deduction factor for the k-th product and by-product output by the unit process.

[0140] Specifically, the carbon offset factor for some products and by-products is calculated based on the carbon content of the products and by-products actually produced. cr =CONT cr ×44 / 12

[0141] In the formula, CONT cr Carbon content of products and by-products.

[0142] In one possible implementation, prior to the step of calculating the sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated using the life cycle carbon footprint assessment model, the method further includes:

[0143] Based on a preset boundary, various transportation methods for raw materials within the preset boundary are obtained, along with the transportation carbon emission factor and transportation distance data for each unit distance traveled by the raw materials in each transportation method.

[0144] The total transport carbon emission factor for all modes of transport is calculated based on the transport carbon emission factor, the transport distance data, and the correction factor.

[0145] The transportation carbon footprint of the product to be evaluated is calculated based on the total transportation carbon emission factor and the process coefficient.

[0146] For example, the carbon footprint of intraplant transportation processes (transportation carbon footprint) can be expressed as the sum of the carbon footprint of transportation processes multiplied by the process coefficients of the corresponding downstream unit processes.

[0147] In the formula, c tran,i,j For input to unit procedure P i,j The carbon footprint of the raw material transportation stage within the system boundary.

[0148] In the formula, q tran For the type of raw material consumed within the system boundary of the unit process; F tran,k The carbon emission factor is the transportation stage of the k-th type of raw material consumed in the process within the system boundary.

[0149] In the formula, z tran The mode of transporting raw materials within the system boundary; f tran,k Let k be the carbon emission factor per unit distance of raw materials within the system boundary, where k represents the mode of transportation; L tran,k denoted as k, representing the transport distance within the system boundary; t represents the empty-load correction factor, where carbon emissions are 0.67 times those of full load. t is 1 when full load and 0.67 when empty.

[0150] On the other hand, as shown in Figure 3, this application provides a carbon footprint evaluation system for steel products, the system comprising:

[0151] The data acquisition module 201 is used to acquire production process data of the product to be evaluated, and energy flow data of the energy system that supplies energy to the production process of the product to be evaluated, and to determine the production unit process and production flow relationship of each production unit process of the product to be evaluated based on the production process data, and to determine the energy unit process and energy flow relationship of each energy unit process of the energy system based on the energy flow data.

[0152] The 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 to calculate the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model.

[0153] The 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 to 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.

[0154] Evaluation module 204 is used to obtain the carbon footprint evaluation result of the product to be evaluated based on the process coefficient, the self-generated energy carbon emission factor, the first input data and the first output data, through the life cycle carbon footprint evaluation model.

[0155] Thirdly, as shown in Figure 4, this application embodiment 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. When the processor executes the computer program, it performs the following steps: acquiring production process data of a product to be evaluated, and energy flow data of an energy system that supplies energy to the production process of the product to be evaluated; determining the production unit process and the production flow relationship of each production unit process based on the production process data; determining the energy unit process and the energy flow relationship of each energy unit process based on the energy flow data; acquiring second input data and second output data of the energy unit process based on the energy flow relationship; calculating the self-produced energy carbon emission factor of the product to be evaluated using an energy system carbon emission factor model; acquiring first input data and first output data of the production unit process based on the production flow relationship; determining the process coefficient of the product to be evaluated in the production process based on the first input data and first output data; and obtaining the carbon footprint evaluation result of the product to be evaluated based on the process coefficient, the self-produced energy carbon emission factor, the first input data, and the first output data using a life cycle carbon footprint evaluation model.

[0156] Fourthly, as shown in Figure 5, this application provides a computer-readable storage medium 400 storing a computer program 411. When executed by a processor, the computer program performs the following steps: acquiring production process data of the product to be evaluated, and energy flow data of the energy system supplying energy to the production process of the product to be evaluated; determining the production unit process and the production flow relationship of each production unit process based on the production process data; determining the energy unit process and the energy flow relationship of each energy unit process based on the energy flow data; acquiring second input data and second output data of the energy unit process based on the energy flow relationship; calculating the self-produced energy carbon emission factor of the product to be evaluated using an energy system carbon emission factor model; acquiring first input data and first output data of the production unit process based on the production flow relationship; determining the process coefficient of the product to be evaluated in the production process based on the first input data and first output data; and obtaining the carbon footprint evaluation result of the product to be evaluated using 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.

[0157] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0158] In the embodiments provided in this 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 illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection of systems or units may be electrical, mechanical, or other forms.

[0159] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0160] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for evaluating the carbon footprint of a steel product, characterized in that, include: The production process data of the product to be evaluated and the energy flow data of the energy system that supplies energy to the production process of the product to be evaluated are obtained. Based on the production process data, the production unit process of the product to be evaluated and the production flow relationship of each production unit process are determined. Based on the energy flow data, the energy unit process of the energy system and the energy flow relationship of each energy unit process are determined. Based on the energy flow relationship, the second input data and the second output data of the energy unit process are obtained, and the self-produced energy carbon emission factor of the product to be evaluated is calculated through the energy system carbon emission factor model. The first input data and the first output data of the production unit process are obtained according to the production flow relationship, and the process coefficient of the product to be evaluated in the production process is determined according to the first input data and the first output data. Based on the process coefficient, the self-generated 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.

2. The method of evaluating the carbon footprint of a steel product according to claim 1, wherein, The step of determining the process coefficient of the product to be evaluated in the production process based on the first input data and the first output data includes: The production unit process is characterized by the 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 based on 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 method of evaluating the carbon footprint of a steel product according to claim 1, wherein, Before the step of obtaining the second input data and second output data of the energy unit process based on 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 method further includes: To obtain the electrical energy flow relationship of electrical energy units in an energy system; Obtain known carbon emission factors and known carbon deduction factors, and establish a power system carbon emission factor model based on the known carbon emission factors, known carbon deduction factors, and the power energy flow relationship; The energy system carbon emission factor model is obtained by characterizing the energy system according to its energy structure using the power system carbon emission factor model.

4. The method of evaluating the carbon footprint of a steel product according to claim 3, wherein, The step of obtaining the energy system carbon emission factor model by characterizing the energy system according to the energy structure of the energy system through the power system carbon emission factor model includes: Determine the types of energy produced by the energy system based on its energy structure. A carbon emission factor model for each energy source is established in the form of the aforementioned power system carbon emission factor model. A set of carbon emission factor models was obtained; The carbon emission factor model of the power system and the set of carbon emission factor models are summed and combined to obtain the carbon emission factor model of the energy system.

5. The method of evaluating the carbon footprint of a steel product according to claim 4, wherein, The energy system carbon emission factor model is: Where x is a for water system, b for heat system, c for gas system, d for oxygen system, and 1 for power system, when x is 1, F1 is the carbon emission factor for electricity consumption, p1 is the total electricity consumption, I1 is the first determinant composed of various input quantities when the energy produced is electrical energy, O1 is the second determinant composed of various output quantities when the energy produced is electrical energy, and F is the third determinant of carbon emission and carbon offset factors. This is the Hadamard operator.

6. The method of evaluating the carbon footprint of a steel product according to claim 5, wherein, The step of obtaining the second input data and second output data of the energy unit process based on 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: The target energy type of the energy produced by the energy unit process is determined based on the energy flow relationship, and the first target determinant of the energy unit process is obtained based on the target energy type as the second input data. The second target determinant of the energy unit process is obtained according to the target energy type, and used as the second output data; The self-produced energy carbon emission factor of the product to be evaluated is calculated based on the 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 method of evaluating the carbon footprint of a steel product as claimed in claim 1, wherein, The step of obtaining the carbon footprint assessment result of the product to be evaluated based on the process coefficient, the self-generated energy carbon emission factor, the first input data, and the first output data through a life cycle carbon footprint assessment model includes: Based on the self-generated energy carbon emission factor, the first input data, and the first output data, the following calculation is performed. Calculate the carbon footprint of the unit process of the product to be evaluated; The total carbon footprint of the product under evaluation in the production process is obtained by multiplying the carbon footprint of each unit process and the process coefficient of each unit process, and then summing them up. The carbon footprint evaluation result of the product to be evaluated is obtained by calculating the sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated using the life cycle carbon footprint evaluation model.

8. The method of evaluating the carbon footprint of a steel product as claimed in claim 1, wherein, Before the step of calculating the sum of the total carbon footprint result and the transportation carbon footprint of the product to be evaluated using the life cycle carbon footprint assessment model, the method further includes: Based on a preset boundary, various transportation methods for raw materials within the preset boundary are obtained, along with the transportation carbon emission factor and transportation distance data for each unit distance traveled by the raw materials in each transportation method. The total transport carbon emission factor for all modes of transport is calculated 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. A system for evaluating the carbon footprint of a steel product, characterized in that, The system includes: The data acquisition module is used to acquire production process data of the product to be evaluated, and energy flow data of the energy system that supplies energy to the production process of the product to be evaluated, and to determine the production unit process and production flow relationship of each production unit process of the product to be evaluated based on the production process data, and to determine the energy unit process and energy flow relationship of each energy unit process of the energy system based on the energy flow data. The 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 to calculate the self-produced energy carbon emission factor of the product to be evaluated through the energy system carbon emission factor model. The second calculation module 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 to 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 is used to obtain the carbon footprint evaluation result of the product to be evaluated based on the process coefficient, the self-generated energy carbon emission factor, the first input data and the first output data, through the life cycle carbon footprint evaluation model.

10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 9. The computer program, which is executed by a processor, implements the method as claimed in any of claims 1 to 7.

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