Iron and steel enterprise carbon trace tracking method based on metallurgical process

Abstract

The invention discloses a steel enterprise carbon trace tracking method based on a metallurgical process, belongs to the technical field of a metallurgical process flow carbon system, and solves the problems that management personnel can only identify a carbon calculation result and difficultly find a specific corresponding position of a steel enterprise for a huge carbon parameter and carbon result system at present; and rapid position locking of problem carbon data cannot be realized so as to implement management. According to the steel enterprise carbon trace tracking method based on the metallurgical process, steel enterprise carbon system association is implemented, a carbon system association model is established, and enterprise-level emission carbon tracking, process-level emission carbon tracking and equipment-level emission carbon tracking are implemented; and enterprise-level, process-level and equipment-level problem carbon data traceability models are further established, and problem carbon data full coverage is implemented, so that the problem carbon generation area emission source search problem of the iron and steel enterprise is solved, and effective process management of the iron and steel enterprise carbon data is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon system in metallurgical process flow, and in particular relates to a carbon trace tracing method for a steel enterprise based on metallurgical process. Background Art

[0002] The process of steel enterprises is complex, consisting of sintering, pelletizing, coking, ironmaking, steelmaking, continuous casting, hot rolling, cold rolling and other processes, which are divided into long processes and short processes, and each process is equivalent to the complete process of a company's product production. At the same time, steel enterprises also include the preparation of industrial gases such as oxygen, nitrogen and argon, gas purification of methane, electricity and steam production, various types of gas, solid, liquid, hazardous waste treatment and partial recycling, etc. In addition, the material supply of steel enterprises includes various types of coal, various types of iron ore, various types of alloys, various types of auxiliary materials, etc., and the procurement locations are also spread all over the world; power consumption includes coal, electricity, natural gas, steam, water, oxygen, nitrogen and argon, etc.; the production process also includes a large number of chemical reactions and physical processing processes. Therefore, the carbon work of steel enterprises is completely different from that of other types of enterprises. If only the total amount of carbon emissions and intensity values ​​are calculated, it is far from enough for steel enterprises. It will make it difficult to track the carbon situation of the enterprise process, let alone the carbon generation area, process links and nodes, etc., so that the process control and process optimization of carbon management cannot be achieved.

[0003] Steel enterprises have heavy tasks in dual carbon work. For such a huge carbon parameter and carbon result system, managers can only identify carbon calculation results, but it is difficult to find the specific corresponding location of the steel enterprise, and it is impossible to quickly lock the location of the problematic carbon data for management. Therefore, the enterprise carbon system needs to have a strong carbon tracking capability, and the actual tracking of carbon emissions at each point in the system has always been a problem that plagues enterprises. Therefore, it is necessary to improve the existing carbon tracking method of steel enterprises. Summary of the invention

[0004] The present invention aims to solve the above-mentioned problems and provides a carbon tracking method for steel enterprises based on metallurgical processes and carbon system laws to implement full coverage of carbon data, help enterprises implement carbon tracking, search for problematic carbon data and the locations of problematic carbon occurrence areas, and support steel enterprises in implementing carbon process management.

[0005] The technical solution adopted by the present invention is: the carbon trace tracing method of a steel enterprise based on metallurgical process comprises the following steps:

[0006] Step 1: Carbon system correlation analysis of steel enterprises; based on the process flow of steel enterprises, the foundation is materials, energy, products and solid waste, and the upper level is carbon emissions;

[0007] Step 2: Naming the carbon traces of the carbon system; For a steel company, the naming rules of the carbon system are divided into five dimensions, namely, company, process, equipment, emission source and carbon name; Among them, the company and process represent a clear area, and it is necessary to divide the steel company into clear and reasonable boundaries; equipment represents a clear and relatively concentrated location; emission source represents the specific material and energy type that causes carbon emissions; carbon name represents the meaning of the specific carbon value;

[0008] Step 3: Establish a carbon tracking model for the carbon system; implement carbon tracking, specifically from two aspects: one is emission carbon tracking, the other is problem carbon tracking; emission carbon tracking refers to the tracking of carbon emissions in the production process at the enterprise level, process level, and equipment level, and the implementation of full coverage of carbon information; problem carbon tracking refers to finding the source of problems in the process area and emission source nodes when the carbon emission calculation results of steel enterprises are distorted or exceed the reasonable range;

[0009] Step 4: Track the carbon emissions of the steel enterprise carbon system; track the carbon emissions at the enterprise level, process level, and equipment level to ensure clear levels and clear tracking logic;

[0010] ① Track enterprise-level carbon emissions to the process level, and clearly trace the carbon emissions of each process;

[0011] ②Trace the carbon emissions from the process level to the equipment level, and trace the carbon emissions of each equipment level;

[0012] ③ Equipment-level carbon emission tracking is further accurately refined to the raw materials, energy, and carbon-fixing material energy layers;

[0013] Through the above three-step process, the carbon footprint of steel enterprises is tracked layer by layer in the order of enterprise layer → process layer → equipment layer → material and energy layer; the path corresponding to carbon emissions, as well as the corresponding specific nodes and specific material and energy categories are clearly and accurately tracked;

[0014] Step 5: Tracking of problematic carbon traces in the carbon system of steel enterprises; when the carbon emissions results of steel enterprises are distorted or exceed a reasonable range, find the corresponding process and emission source node problems to help steel enterprises implement process management of carbon data; design a problematic carbon trace tracking implementation process based on the carbon trace naming rules and carbon trace tracking model of the carbon system in steps 2 and 3; problematic carbon process management is solved in two steps: one is to find the problematic carbon data, and the other is to find the problematic carbon location.

[0015] The first step is the process flow of the steel enterprise, which is composed of a series of main processes to form the main production process of the steel enterprise, and also includes auxiliary production processes and subsidiary production processes; this series of processes constitutes the process framework of the operation base of the carbon system of the steel enterprise; the operation of various systems, materials, energy and product production of the steel enterprise are all based on this process framework, which is the carrier of the carbon system;

[0016] The material and energy system of steel enterprises is the foundation of the carbon system. The products of the process are the intermediate products of the steel enterprise's technological process. Material energy includes purchased materials, purchased energy, enterprise-produced secondary energy, and recycled energy. In addition, it also includes waste generated by this process that needs to be treated.

[0017] The carbon system of steel enterprises includes enterprise-level carbon, process-level carbon, equipment-level carbon and various material emission sources.

[0018] Step 2: Carbon system standard name: enterprise name + process name + equipment name + emission source name + carbon name. These five naming dimensions can be selected and combined according to actual conditions; for example:

[0019] Company name: A Steel Plant

[0020] Process name: Ironmaking process

[0021] Equipment Name: 1# Blast Furnace

[0022] Emission source: Gas consumption

[0023] Carbon name: Carbon emissions

[0024] Therefore, the carbon system name of this location is "A Steel Plant + Ironmaking Process + 1# Blast Furnace + Coal Gas Consumption + Carbon Emissions"; the first and second parts of the carbon system name indicate the specific regional location of the process flow, the third part indicates the location of a specific equipment point, the fourth part indicates the name of the emission source, and the fifth part indicates the specific type of carbon data.

[0025] Step 3: the equipment-level carbon model of the carbon system of the steel enterprise; the equipment level here refers to the most important kiln equipment in each production process of the steel enterprise, including coke oven, sintering machine, blast furnace, converter, electric furnace, heating furnace and boiler;

[0026] The names of the input and output items of equipment-level carbon are as follows:

[0027] Name 1: Equipment i-input material j-carbon content;

[0028] Name 2: Equipment i - input energy j - carbon content;

[0029] Name 3: Equipment i-output gas j-carbon content;

[0030] Name 4: Equipment i- output liquid j- carbon content;

[0031] Name 5: Equipment i - output solid j - carbon content;

[0032] Name 6: Equipment i - Amount of carbon emitted;

[0033] The calculation formula using carbon balance is as follows:

[0034] Name 1: C 1-i-j =M 1-i-j ×[c] 1-i-j

[0035] In the formula, C 1-i-j Indicates equipment i-input material j-carbon content;

[0036] M 1-i-j It represents the physical quantity of material j put into equipment i;

[0037] [c] 1-i-j Indicates the carbon content of material j fed into equipment i;

[0038] Name 2: C 2-i-j =M 2-i-j ×[c] 2-i-j

[0039] In the formula, C 2-i-j It means equipment i - input energy j - carbon content;

[0040] M 2-i-j It represents the physical amount of energy j invested in equipment i;

[0041] [c] 2-i-j It represents the carbon content of energy j input into equipment i;

[0042] Name 3: C 3-i-j =M 3-i-j ×[c] 3-i-j

[0043] In the formula, C 3-i-j Indicates that equipment i-output gas j-carbon content;

[0044] M 3-i-j It represents the physical quantity of gas j output by equipment i;

[0045] [c] 3-i-j Indicates the carbon content of gas j output by device i;

[0046] Name 4: C 4-i-j =M 4-i-j ×[c] 4-i-j

[0047] In the formula, C 4-i-j Indicates that device i-output liquid j-carbon content;

[0048] M 4-i-j It represents the physical amount of liquid j output by device i;

[0049] [c] 4-i-jIndicates the carbon content of liquid j output by device i;

[0050] Name 5: C 5-i-j =M 5-i-j ×[c] 5-i-j

[0051] In the formula, C 5-i-j Indicates that equipment i-output solid j-carbon content;

[0052] M 5-i-j It represents the physical quantity of solid j output by equipment i;

[0053] [c] 5-i-j Indicates the carbon content of solid j output by device i;

[0054] Name 6: C 6-i =C 1-i-j +C 2-i-j -C 3-i-j -C 4-i-j -C 5-i-j

[0055] In the formula, C 6-i Indicates the amount of carbon emitted by equipment i;

[0056] CO2 emissions from equipment i:

[0057] In the formula, Indicates the carbon dioxide emissions of equipment i.

[0058] The step three is a process-level carbon model of the carbon system of a steel enterprise; a steel enterprise includes a sintering process, a pelletizing process, a coking process, an ironmaking process, a converter process, an electric furnace process, a refining process, a continuous casting process, a steel rolling process, a lime process, and a power generation process;

[0059] The process-level carbon emission calculation model of the steel enterprise carbon system is:

[0060]

[0061] In the formula, represents the process-level carbon dioxide emissions, and g represents the sequence number of the process;

[0062] In addition, a considerable amount of carbon from this process enters other links of the steel enterprise in the form of gaseous carbon, liquid carbon and solid carbon.

[0063] Step 3: an enterprise-level carbon model of the carbon system of a steel enterprise; the enterprise-level carbon emissions include the total carbon emissions of each process and the carbon emissions of auxiliary production systems and subsidiary production systems;

[0064] The enterprise-level carbon emission calculation model of the steel enterprise carbon system is:

[0065]

[0066] In the formula, represents enterprise-level carbon emissions;

[0067] It represents the carbon emissions of auxiliary production systems of steel enterprises;

[0068] It represents the carbon emissions of the steel enterprise's subsidiary production systems;

[0069] Similar to the process level, a considerable amount of enterprise-level carbon is also exported from steel enterprises in the form of gaseous carbon elements, liquid carbon elements and solid carbon elements.

[0070] The step five is to find out problematic carbon data;

[0071] The carbon footprint tracking mathematical model of the carbon system has the following three types of parameters:

[0072] Equipment i CO2 emissions,

[0073] CO2 emissions from process g,

[0074] Company-level CO2 emissions,

[0075] The concept of carbon emission intensity is introduced, represented by the lowercase letter p; the calculation is as follows:

[0076]

[0077] In the formula, represents the carbon intensity of equipment i, that is, the carbon dioxide emissions per unit output of the equipment;

[0078] M i Represents the output of equipment i, such as molten iron output of blast furnace and power generation of unit;

[0079]

[0080] In the formula, represents the carbon intensity of process g, i.e., the carbon dioxide emissions per unit output of the process;

[0081] M g Indicates the output of process g, such as the output of molten iron in the ironmaking process and the output of coke in the coking process;

[0082]

[0083] In the formula, It represents the carbon intensity of steel enterprises, that is, the carbon dioxide emissions per ton of steel produced by the enterprise;

[0084] M 企业 Represents the crude steel output of steel enterprises.

[0085] Furthermore, according to the actual situation of the enterprise, the lower limit and upper limit of the above carbon emission intensity are given, which are indicated by the superscripts min and max;

[0086] When the enterprise carbon data, process carbon data and equipment carbon data meet the judgment conditions, that is: This shows that the carbon data of steel enterprises is reasonable and can be used directly; when the judgment conditions are not met, it is necessary to further implement problem carbon data tracking to help enterprises implement carbon data process management.

[0087] Step 5, tracing the problematic carbon data;

[0088] After finding the problematic carbon data, we will track the problematic carbon data and find out where the problematic carbon came from. This can be done in the following steps:

[0089] ①Carbon tracking of equipment-level issues

[0090] When problematic carbon data appears at the equipment level, it is necessary to verify the relevant materials, energy, and carbon fixation parameters to determine whether the parameter signal is interrupted and the data exceeds the standard, so as to ensure that the carbon basic data exists and is reasonable; through this verification process, the input material j, input energy j, output gas j, output liquid j, or output solid j where the problematic carbon occurs can be directly traced, and then the error prompt of the problematic carbon source can be centrally output to ensure that the problematic carbon data at the equipment level is discovered and handled in a timely manner;

[0091] ②Carbon tracking of process-level issues

[0092] When a problem occurs at the process level, it is necessary to check the status of each device in the process; judge the rationality of the carbon data of each device through the indicator carbon intensity; at the same time, for the tracking of equipment-level problem carbon data, directly call the problem carbon data tracking process of the previous process;

[0093] ③ Enterprise-level carbon tracking

[0094] When enterprise-level problem carbon appears, it means that the enterprise-level carbon total results are unreasonable; enterprise-level problem carbon tracking needs to be analyzed and tracked step by step through the process level and equipment level; in addition to checking the main processes, enterprise-level problem carbon data also needs to check the auxiliary processes and subsidiary processes until the source of the carbon data problem is found.

[0095] The beneficial effects of the present invention are as follows: the carbon trace tracking method for steel enterprises based on metallurgical processes implements enterprise-level emission carbon tracking, process-level emission carbon tracking, and equipment-level emission carbon tracking by implementing carbon system association of steel enterprises and establishing a carbon system association model; and further establishes enterprise-level, process-level, and equipment-level problem carbon data traceability models to implement full coverage of problem carbon data, thereby solving the problem of searching for emission sources in the occurrence areas of problem carbon in steel enterprises and ensuring effective process management of carbon data in steel enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] Figure 1 It is a schematic diagram of the correlation of the carbon system of the steel enterprise according to the method of the present invention.

[0097] Figure 2 The present invention is a schematic diagram of the process flow of a steel enterprise.

[0098] Figure 3 It is a schematic diagram of the material energy system of a steel enterprise according to the method of the present invention.

[0099] Figure 4 Schematic diagram of the carbon system of a steel enterprise according to the method of the present invention.

[0100] Figure 5 It is a schematic diagram of the equipment-level carbon model of a steel enterprise according to the method of the present invention.

[0101] Figure 6 It is a schematic diagram of the process-level carbon model of a steel enterprise according to the method of the present invention.

[0102] Figure 7 It is a schematic diagram of the enterprise-level carbon model of a steel enterprise according to the method of the present invention.

[0103] Figure 8 It is a schematic diagram of enterprise-level regional carbon tracking of the carbon system of a steel enterprise according to the method of the present invention.

[0104] Fig. 9 It is a schematic diagram of process-level regional carbon tracking of the carbon system of a steel enterprise according to the method of the present invention.

[0105] Fig.10 It is a schematic diagram of equipment-level carbon emission tracking of the carbon system of a steel enterprise according to the method of the present invention.

[0106] Fig.11 It is a schematic diagram of carbon tracking of carbon emissions from the carbon system of a steel enterprise according to the method of the present invention.

[0107] Fig.12 It is a flowchart of the problem carbon data identification process of the method of the present invention.

[0108] Fig.13 It is a flowchart of the device-level problematic carbon data source tracking process of the method of the present invention.

[0109] Fig.14 It is a flowchart of the process level problem carbon data source tracking method of the present invention.

[0110] Fig.15 It is a flowchart of the enterprise-level problematic carbon data source tracking process of the method of the present invention. DETAILED DESCRIPTION

[0111] At present, when the carbon emissions and carbon intensity of steel enterprises exceed the standard or the carbon results are wrong, the enterprises are unable to conduct effective self-inspection; for this reason, the patent of this invention proposes a carbon trace tracking method for steel enterprises based on metallurgical processes, which implements enterprise-level emission carbon tracking, process-level emission carbon tracking, and equipment-level emission carbon tracking by implementing carbon system correlation of steel enterprises and establishing a carbon system correlation model.

[0112] The specific steps of the present invention are described in detail. The carbon tracking method for steel enterprises based on metallurgical processes includes:

[0113] Step 1: Correlation analysis of carbon system of steel enterprises.

[0114] The correlation of carbon system in steel enterprises is as follows Figure 1 As shown. After analysis, carbon tracking of steel enterprises can be carried out on three levels: first, the process production process system of steel enterprises is the carrier; second, the material energy system is the basis; third, the carbon system is the top level display. That is, based on the process flow of steel enterprises, the foundation is materials, energy, products and solid waste, and the upper level is carbon emissions (i.e. carbon trace).

[0115] Steel enterprise process flow Figure 2 As shown in the figure, the main production process of steel enterprises is composed of a series of main processes, in addition to auxiliary production processes and subsidiary production processes; this series of processes constitutes the process framework of the operation base of the carbon system of steel enterprises. The operation of various systems, materials, energy and product production of steel enterprises are all based on this process framework, which is the carrier of the carbon system.

[0116] Steel enterprise material and energy system Figure 3 As shown in the figure, the material energy system is the basis of the carbon system. In the figure, product 1 of process 1 is the intermediate product of the steel enterprise's process flow. Material energy includes purchased materials, purchased energy, enterprise-produced secondary energy, and recycled energy. In addition, it also includes waste generated by this process that needs to be processed; product N of the last process is a takeaway product.

[0117] Carbon system of steel enterprises Figure 4 As shown, it includes enterprise-level carbon, process-level carbon, equipment-level carbon and various material emission sources. In the figure, ①, ②, and ③ in process i and equipment i represent various material carbon, energy carbon and fixed carbon, etc. The carbon emission sources in other equipment carbon are the same and are not repeated in the figure.

[0118] Step 2: The naming rules of carbon traces in the carbon system association model of steel enterprises.

[0119] The method of the present invention combines industry practices and stipulates the naming rules of the carbon system to better implement carbon tracking in steel enterprises. For a steel enterprise, the naming rules of the carbon system are divided into five dimensions, namely enterprise, process, equipment, emission source and carbon name. Among them, the enterprise and process represent a clear area, and it is necessary to divide the steel enterprise into clear and reasonable boundaries; the equipment represents a clear and relatively concentrated location; the emission source represents the specific material and energy type that causes carbon emissions; the carbon name represents the meaning of the specific carbon value.

[0120] The standard name of the carbon system: enterprise name + process name + equipment name + emission source name + carbon name. These five naming dimensions can be selected and combined according to actual conditions. For example:

[0121] Company name: A Steel Plant

[0122] Process name: Ironmaking process

[0123] Equipment Name: 1# Blast Furnace

[0124] Emission source: Gas consumption

[0125] Carbon name: Carbon emissions

[0126] Therefore, the carbon system name of this location is "A steel plant + ironmaking process + 1# blast furnace + coal gas consumption + carbon emissions"; the first and second parts of the carbon system name indicate the specific regional location of the process flow, the third part indicates a specific equipment point location, the fourth part indicates the name of the emission source, and the fifth part indicates the specific type of carbon data (such as carbon emissions or carbon emission intensity). Establishing a standard carbon system naming rule will lay the foundation for carbon tracking.

[0127] Step 3: Carbon tracking model of the carbon system in the carbon system association model of steel enterprises.

[0128] The method of the present invention implements carbon trace tracking, specifically speaking, it works from two aspects: one is emission carbon tracking, and the other is problem carbon tracking; emission carbon tracking refers to the tracking of carbon emissions in production processes at the enterprise level, process level, and equipment level, and the implementation of full coverage of carbon information; problem carbon tracking refers to finding the source of problems such as process areas and emission source nodes when the calculated results of the carbon emissions of steel enterprises are distorted or exceed a reasonable range.

[0129] At the same time, according to the above viewpoints of the method of the present invention, the carbon tracking of steel enterprises is carried out based on three levels: first, the process production process system of the steel enterprise is the carrier; second, the material energy system is the basis; third, the carbon system is the top level display. That is, based on the process flow of the steel enterprise, the bottom layer is materials, energy, products and solid waste, and the upper layer is the carbon system.

[0130] (1) Equipment-level carbon model of the carbon system of steel enterprises

[0131] The equipment-level carbon physical model of the carbon system of steel enterprises is as follows: Figure 5 As shown. First of all, the equipment level here refers to the most important kiln equipment in each production process of the steel enterprise, such as coke ovens, sintering machines, blast furnaces, converters, electric furnaces, heating furnaces and boilers. Taking the blast furnace as an example, it is different from the small equipment of general enterprises (such as single pumps and fans). The blast furnace is huge in size, and a complete set of production systems, auxiliary production systems, and ancillary production systems are built around the blast furnace. Usually when steel companies mention blast furnaces, they refer to the blast furnace body and the above-mentioned complete production system surrounding the blast furnace, including the blast furnace body system, fuel system, air supply system, water circulation system, oxygen system, nitrogen system, residual pressure and residual energy power recovery system, gas recovery system, steam system, slag treatment system, etc.

[0132] Figure 5 In the table, the input and output names of equipment-level carbon are as follows:

[0133] Name 1: Equipment i-input material j-carbon content;

[0134] Name 2: Equipment i - input energy j - carbon content;

[0135] Name 3: Equipment i-output gas j-carbon content;

[0136] Name 4: Equipment i- output liquid j- carbon content;

[0137] Name 5: Equipment i - output solid j - carbon content;

[0138] Name 6: Equipment i - Amount of carbon emitted.

[0139] The calculation formula using carbon balance is as follows:

[0140] Name 1: C 1-i-j =M 1-i-j ×[c] 1-i-j

[0141] In the formula, C 1-i-j Indicates equipment i-input material j-carbon content;

[0142] M 1-i-j It represents the physical quantity of material j put into equipment i;

[0143] [c] 1-i-j It indicates the carbon content of material j input into equipment i.

[0144] Name 2: C 2-i-j =M 2-i-j ×[c] 2-i-j

[0145] In the formula, C 2-i-j It means equipment i-input energy j-carbon content;

[0146] M 2-i-j It represents the physical amount of energy j invested in equipment i;

[0147] [c] 2-i-j It represents the carbon content of energy j input into equipment i.

[0148] Name 3: C 3-i-j =M 3-i-j ×[c] 3-i-j

[0149] In the formula, C 3-i-j Indicates that equipment i-output gas j-carbon content;

[0150] M 3-i-j It represents the physical quantity of gas j output by equipment i;

[0151] [c] 3-i-j Indicates the carbon content of the output gas j from device i.

[0152] Name 4: C 4-i-j =M 4-i-j ×[c] 4-i-j

[0153] In the formula, C 4-i-j Indicates that device i-output liquid j-carbon content;

[0154] M 4-i-j It represents the physical amount of liquid j output by device i;

[0155] [c] 4-i-j Indicates the carbon content of liquid j output by device i.

[0156] Name 5: C 5-i-j =M 5-i-j ×[c] 5-i-j

[0157] In the formula, C 5-i-j Indicates that equipment i-output solid j-carbon content;

[0158] M 5-i-j It represents the physical quantity of solid j output by equipment i;

[0159] [c] 5-i-j Indicates the carbon content of solid j output by device i.

[0160] Name 6: C 6-i =C 1-i-j +C 2-i-j -C 3-i-j -C 4-i-j -C 5-i-j

[0161] In the formula, C 6-i Indicates the amount of carbon emitted by equipment i;

[0162] CO2 emissions from equipment i:

[0163] In the formula, Indicates the carbon dioxide emissions of equipment i.

[0164] (2) Process-level carbon model of the carbon system of steel enterprises

[0165] The process-level carbon physical model of the carbon system of steel enterprises is as follows: Figure 6 As shown. According to industry requirements, steel enterprises include sintering process, pelletizing process, coking process, ironmaking process, converter process, electric furnace process, refining process, continuous casting process, steel rolling process, lime process, power generation process, etc. Each process is composed of multiple sets of equipment systems, so there are many corresponding carbon dioxide emission sources.

[0166] The process-level carbon emission calculation model of the steel enterprise carbon system is:

[0167]

[0168] In the formula, represents the process-level carbon dioxide emissions, and g represents the sequence number of the process;

[0169] In addition, a considerable amount of carbon from this process enters other links of the steel enterprise in the form of gaseous carbon, liquid carbon and solid carbon.

[0170] (3) Enterprise-level carbon model of the carbon system of steel enterprises

[0171] The enterprise-level carbon physical model of the carbon system of steel enterprises is as follows: Figure 7 The enterprise-level carbon emissions include the total carbon emissions of each process and the carbon emissions of auxiliary production systems and subsidiary production systems.

[0172] The enterprise-level carbon emission calculation model of the steel enterprise carbon system is:

[0173]

[0174] In the formula, represents enterprise-level carbon emissions;

[0175] It represents the carbon emissions of auxiliary production systems of steel enterprises;

[0176] Represents the carbon emissions of the steel enterprise's subsidiary production systems.

[0177] Similar to the process level, a considerable amount of enterprise-level carbon is also exported from steel enterprises in the form of gaseous carbon elements, liquid carbon elements and solid carbon elements.

[0178] The carbon system carbon trace tracking problem solved by the method of the present invention is within the boundary of the steel enterprise. The carbon emission factors provided by the background database are not within the scope of discussion of the present invention. It is believed that the factors provided by the background database are reasonable and accurate.

[0179] Step 4: Carbon emission tracking of the steel enterprise carbon system. Carbon emission tracking refers to the tracking of carbon emissions in the production process at the enterprise level, process level, and equipment level.

[0180] (1) Enterprise-level carbon emissions tracking

[0181] In order to ensure clear hierarchy and uncluttered tracking logic, the method of the present invention adopts layer-by-layer tracking at the enterprise level, process level, and equipment level. Therefore, the carbon emissions at the enterprise level can be traced to the process level, and the carbon emissions of each process can be clearly traced. Figure 8 shown.

[0182] (2) Process-level carbon emission tracking

[0183] The carbon emissions at the process level can be traced to the equipment level, and the carbon emissions at each equipment level can also be traced. Taking the coking process, ironmaking process, converter steelmaking process, and steel rolling process as examples, the specific Fig. 9 shown.

[0184] (3) Equipment-level carbon emissions tracking

[0185] Equipment-level carbon emission tracking will be further refined to the material energy layer such as raw materials, energy, and carbon fixation. Taking coke oven equipment, blast furnace equipment, converter equipment, and heating furnace equipment as examples, the specific Fig.10 shown.

[0186] Through the above three-step process, the carbon footprint of steel enterprises can be tracked layer by layer in the order of enterprise layer → process layer → equipment layer → material energy layer; the corresponding path of carbon emissions, as well as the corresponding specific nodes and specific material energy categories can be clearly and accurately tracked. In this way, the carbon footprint tracking of carbon emissions of steel enterprises can be completed. Fig.11shown.

[0187] Step 5: Track carbon footprint of problems in the steel enterprise’s carbon system.

[0188] Carbon traceability of steel enterprises’ carbon systems refers to finding the corresponding process and emission source nodes when the carbon emission results of steel enterprises are distorted or exceed a reasonable range, helping steel enterprises implement process management of carbon data.

[0189] According to the carbon trace naming rules of the carbon system in step 2 and step 3 of the method of the present invention and the carbon trace tracking model, a problem carbon trace tracking implementation process is designed. Problem carbon process management is solved in two steps: one is to find the problem carbon data, and the other is to find the problem carbon location.

[0190] (1) Identify problematic carbon data

[0191] Carbon data of steel enterprises include: enterprise-level carbon data, process-level carbon data, equipment-level carbon data, material energy carbon data and carbon sequestration data, etc. Among them, enterprise-level, process-level and equipment-level carbon data need to be further broken down into specific parameters, while material energy carbon data and carbon sequestration data themselves are directly related to specific parameters.

[0192] Referring to the contents of step 2 and step 3, the following three types of parameters of the carbon footprint tracking mathematical model of the carbon system are:

[0193] Equipment i CO2 emissions,

[0194] CO2 emissions from process g,

[0195] Company-level CO2 emissions,

[0196] It is necessary to introduce the concept of carbon emission intensity, represented by the lowercase letter p; the calculation is as follows:

[0197]

[0198] In the formula, represents the carbon intensity of equipment i, that is, the carbon dioxide emissions per unit output of the equipment;

[0199] M i Represents the output of equipment i, such as molten iron output of blast furnace, power generation of unit, etc.

[0200]

[0201] In the formula, represents the carbon intensity of process g, i.e., the carbon dioxide emissions per unit output of the process;

[0202] Mg Represents the output of process g, such as the output of molten iron in the ironmaking process, the output of coke in the coking process, etc.

[0203]

[0204] In the formula, It represents the carbon intensity of steel enterprises, that is, the carbon dioxide emissions per ton of steel produced by the enterprise;

[0205] M 企业 Represents the crude steel output of steel enterprises.

[0206] According to the actual situation of the enterprise, the lower limit and upper limit of the above carbon emission intensity are given, which are indicated by the superscripts min and max. The judgment process is as follows: Fig.12 shown.

[0207] like Fig.12 As shown in the figure, when the enterprise carbon data, process carbon data and equipment carbon data meet the judgment conditions, that is: This shows that the carbon data of steel enterprises is reasonable and can be used directly; when the judgment conditions are not met, it is necessary to further implement problem carbon data tracking to help enterprises implement carbon data process management.

[0208] (2) Carbon data traceability issues

[0209] After finding the problematic carbon data through the previous process, the next step is to track the problematic carbon data and find out where the problematic carbon came from. This is divided into the following steps:

[0210] ①Carbon tracking of equipment-level issues

[0211] When problematic carbon data appears at the equipment level, it is necessary to verify the relevant parameters such as materials, energy, and carbon fixation to determine whether the parameter signal is interrupted and the data exceeds the standard, so as to ensure that the carbon basic data exists and is reasonable. Fig.13 As shown. Through this verification process, the input material j, input energy j, output gas j, output liquid j or output solid j where the problematic carbon occurs can be directly traced, and then the error prompt of the problematic carbon source can be centrally output to ensure that the equipment-level problematic carbon data is discovered and processed in a timely manner. The same is true for process-level problematic carbon and enterprise-level problematic carbon.

[0212] ②Carbon tracking of process-level issues

[0213] When a problem occurs at the process level, it is necessary to check the status of each device in the process; judge the rationality of the carbon data of each device through the indicator carbon intensity; at the same time, for the tracking of equipment-level problem carbon data, directly call the problem carbon data tracking process of the previous process, as follows Fig.14 shown.

[0214] ③ Enterprise-level carbon tracking

[0215] When enterprise-level problematic carbon appears, it means that the total carbon output at the enterprise level is unreasonable; tracking of enterprise-level problematic carbon needs to be analyzed and tracked step by step through the process level and equipment level; in addition to checking the main processes, enterprise-level problematic carbon data also needs to check auxiliary processes and subsidiary processes until the source of the carbon data problem is found, such as Fig.15 shown.

Claims

1. A carbon trace tracing method for steel enterprises based on metallurgical process, characterized in that: The steps include: Step 1: Carbon system correlation analysis of steel enterprises; based on the process flow of steel enterprises, the foundation is materials, energy, products and solid waste, and the upper level is carbon emissions; Step 2: Naming the carbon traces of the carbon system; For a steel company, the naming rules of the carbon system are divided into five dimensions, namely, company, process, equipment, emission source and carbon name; Among them, the company and process represent a clear area, and it is necessary to divide the steel company into clear and reasonable boundaries; equipment represents a clear and relatively concentrated location; emission source represents the specific material and energy type that causes carbon emissions; carbon name represents the meaning of the specific carbon value; Step 3: Establish a carbon tracking model for the carbon system; implement carbon tracking, specifically from two aspects: one is emission carbon tracking, the other is problem carbon tracking; emission carbon tracking refers to the tracking of carbon emissions in the production process at the enterprise level, process level, and equipment level, and the implementation of full coverage of carbon information; problem carbon tracking refers to finding the source of problems in the process area and emission source nodes when the carbon emission calculation results of steel enterprises are distorted or exceed the reasonable range; Step 4: Track the carbon emissions of the steel enterprise carbon system; track the carbon emissions at the enterprise level, process level, and equipment level to ensure clear levels and clear tracking logic; ① Track enterprise-level carbon emissions to the process level, and clearly trace the carbon emissions of each process; ②Trace the carbon emissions from the process level to the equipment level, and trace the carbon emissions of each equipment level; ③ Equipment-level carbon emission tracking is further accurately refined to the raw materials, energy, and carbon-fixing material energy layers; Through the above three-step process, the carbon footprint of steel enterprises is tracked layer by layer in the order of enterprise layer → process layer → equipment layer → material and energy layer; the path corresponding to carbon emissions, as well as the corresponding specific nodes and specific material and energy categories are clearly and accurately tracked; Step 5: Tracking of problematic carbon traces in the carbon system of steel enterprises; when the carbon emissions results of steel enterprises are distorted or exceed a reasonable range, find the corresponding process and emission source node problems to help steel enterprises implement process management of carbon data; design a problematic carbon trace tracking implementation process based on the carbon trace naming rules and carbon trace tracking model of the carbon system in steps 2 and 3; problematic carbon process management is solved in two steps: one is to find the problematic carbon data, and the other is to find the problematic carbon location.

2. The carbon trace tracing method for steel enterprises based on metallurgical process according to claim 1 is characterized by: The first step is the process flow of the steel enterprise, which is composed of a series of main processes to form the main production process of the steel enterprise, and also includes auxiliary production processes and subsidiary production processes; this series of processes constitutes the process framework of the operation base of the carbon system of the steel enterprise; the operation of various systems, materials, energy and product production of the steel enterprise are all based on this process framework, which is the carrier of the carbon system; The material and energy system of steel enterprises is the foundation of the carbon system. The products of the process are the intermediate products of the steel enterprise's technological process. Material energy includes purchased materials, purchased energy, enterprise-produced secondary energy, and recycled energy. In addition, it also includes waste generated by this process that needs to be treated. The carbon system of steel enterprises includes enterprise-level carbon, process-level carbon, equipment-level carbon and various material emission sources.

3. The carbon trace tracing method for steel enterprises based on metallurgical process according to claim 1 is characterized by: Step 2: Standard name of carbon system: enterprise name + process name + equipment name + emission source name + carbon name. These five naming dimensions can be selected and combined according to actual conditions. For example: Company name: A Steel Plant Process name: Ironmaking process Equipment Name: 1# Blast Furnace Emission source: Gas consumption Carbon name: Carbon emissions Therefore, the carbon system name of this location is "A Steel Plant + Ironmaking Process + 1# Blast Furnace + Coal Gas Consumption + Carbon Emissions"; the first and second parts of the carbon system name represent the specific regional location of the process flow, the third part represents a specific equipment point location, the fourth part represents the name of the emission source, and the fifth part represents the specific type of carbon data.

4. The carbon trace tracing method for steel enterprises based on metallurgical process according to claim 1 is characterized by: Step 3: the equipment-level carbon model of the carbon system of the steel enterprise; the equipment level here refers to the most important kiln equipment in each production process of the steel enterprise, including coke oven, sintering machine, blast furnace, converter, electric furnace, heating furnace and boiler; The names of the input and output items of equipment-level carbon are as follows: Name 1: Equipment i-input material j-carbon content; Name 2: Equipment i - input energy j - carbon content; Name 3: Equipment i-output gas j-carbon content; Name 4: Equipment i- output liquid j- carbon content; Name 5: Equipment i - output solid j - carbon content; Name 6: Equipment i - Amount of carbon emitted; The calculation formula using carbon balance is as follows: Name 1: C 1-i-j =M 1-i-j ×[c] 1-i-j In the formula, C 1-i-j Indicates equipment i-input material j-carbon content; M 1-i-j It represents the physical quantity of material j put into equipment i; [c] 1-i-j Indicates the carbon content of material j fed into equipment i; Name 2: C 2-i-j =M 2-i-j ×[c] 2-i-j In the formula, C 2-i-j It means equipment i - input energy j - carbon content; M 2-i-j It represents the physical amount of energy j invested in equipment i; [c] 2-i-j It represents the carbon content of energy j input into equipment i; Name 3: C 3-i-j =M 3-i-j ×[c] 3-i-j In the formula, C 3-i-j Indicates that equipment i-output gas j-carbon content; M 3-i-j It represents the physical quantity of gas j output by equipment i; [c] 3-i-j Indicates the carbon content of gas j output by device i; Name 4: C 4-i-j =M 4-i-j ×[c] 4-i-j In the formula, C 4-i-j Indicates that device i-output liquid j-carbon content; M 4-i-j It represents the physical amount of liquid j output by device i; [c] 4-i-j Indicates the carbon content of liquid j output by device i; Name 5: C 5-i-j =M 5-i-j ×[c] 5-i-j In the formula, C 5-i-j Indicates that equipment i-output solid j-carbon content; M 5-i-j It represents the physical quantity of solid j output by equipment i; [c] 5-i-j Indicates the carbon content of solid j output by device i; Name 6: C 6-i =C 1-i-j +C 2-i-j -C 3-i-j -C 4-i-j -C 5-i-j In the formula, C 6-i Indicates the amount of carbon emitted by equipment i; CO2 emissions from equipment i: In the formula, Indicates the carbon dioxide emissions of equipment i.

5. The carbon trace tracing method for steel enterprises based on metallurgical process according to claim 1 is characterized by: The step three is a process-level carbon model of the carbon system of a steel enterprise; a steel enterprise includes a sintering process, a pelletizing process, a coking process, an ironmaking process, a converter process, an electric furnace process, a refining process, a continuous casting process, a steel rolling process, a lime process, and a power generation process; The process-level carbon emission calculation model of the steel enterprise carbon system is: In the formula, represents the process-level carbon dioxide emissions, and g represents the sequence number of the process; In addition, a considerable amount of carbon from this process enters other links of the steel enterprise in the form of gaseous carbon, liquid carbon and solid carbon.

6. The carbon trace tracing method for steel enterprises based on metallurgical process according to claim 1 is characterized by: Step 3: an enterprise-level carbon model of the carbon system of a steel enterprise; the enterprise-level carbon emissions include the total carbon emissions of each process and the carbon emissions of auxiliary production systems and subsidiary production systems; The enterprise-level carbon emission calculation model of the steel enterprise carbon system is: In the formula, represents enterprise-level carbon emissions; It represents the carbon emissions of auxiliary production systems of steel enterprises; It represents the carbon emissions of the steel enterprise's subsidiary production systems; Similar to the process level, a considerable amount of enterprise-level carbon is also exported from steel enterprises in the form of gaseous carbon elements, liquid carbon elements and solid carbon elements.

7. The carbon trace tracing method for steel enterprises based on metallurgical process according to claim 1 is characterized by: The step five is to find out problematic carbon data; The carbon footprint tracking mathematical model of the carbon system has the following three types of parameters: Equipment i CO2 emissions, CO2 emissions from process g, Company-level CO2 emissions, The concept of carbon emission intensity is introduced, represented by the lowercase letter p; the calculation is as follows: In the formula, represents the carbon intensity of equipment i, that is, the carbon dioxide emissions per unit output of the equipment; M i Represents the output of equipment i, such as molten iron output of blast furnace and power generation of unit; In the formula, represents the carbon intensity of process g, i.e., the carbon dioxide emissions per unit output of the process; M g Indicates the output of process g, such as the output of molten iron in the ironmaking process and the output of coke in the coking process; In the formula, It represents the carbon intensity of steel enterprises, that is, the carbon dioxide emissions per ton of steel produced by the enterprise; M 企业 Represents the crude steel output of steel enterprises.

8. The carbon trace tracing method for steel enterprises based on metallurgical process according to claim 7 is characterized by: According to the actual situation of the enterprise, the lower and upper limits of the above carbon emission intensity are assigned, which are indicated by the superscripts min and max; When the enterprise carbon data, process carbon data and equipment carbon data meet the judgment conditions, that is: This shows that the carbon data of steel enterprises is reasonable and can be used directly; when the judgment conditions are not met, it is necessary to further implement problem carbon data tracking to help enterprises implement carbon data process management.

9. The carbon trace tracing method for steel enterprises based on metallurgical process according to claim 1 is characterized by: Step 5, tracing the problematic carbon data; After finding the problematic carbon data, we will track the problematic carbon data and find out where the problematic carbon came from. This can be done in the following steps: ①Carbon tracking of equipment-level issues When problematic carbon data appears at the equipment level, it is necessary to verify the relevant materials, energy, and carbon fixation parameters to determine whether the parameter signal is interrupted and the data exceeds the standard, so as to ensure that the carbon basic data exists and is reasonable; through this verification process, the input material j, input energy j, output gas j, output liquid j, or output solid j where the problematic carbon occurs can be directly traced, and then the error prompt of the problematic carbon source can be centralized to ensure that the problematic carbon data at the equipment level is discovered and handled in a timely manner; ②Carbon tracking of process-level issues When a problem occurs at the process level, it is necessary to check the status of each device in the process; judge the rationality of the carbon data of each device through the indicator carbon intensity; at the same time, for the tracking of equipment-level problem carbon data, directly call the problem carbon data tracking process of the previous process; ③ Enterprise-level carbon tracking When enterprise-level problem carbon appears, it means that the enterprise-level carbon total results are unreasonable; enterprise-level problem carbon tracking needs to be analyzed and tracked step by step through the process level and equipment level; in addition to checking the main processes, enterprise-level problem carbon data also needs to check the auxiliary processes and subsidiary processes until the source of the carbon data problem is found.

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