CN116823295B - Method, system, equipment and medium for measuring carbon emission in steel industry - Google Patents
Method, system, equipment and medium for measuring carbon emission in steel industry Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 267
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 267
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 233
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 264
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 203
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a method, a system, equipment and a medium for measuring carbon emission in the steel industry, which belong to the technical field of carbon emission measurement and comprise the following steps: acquiring the direct carbon emission, outsourcing electric quantity, the electricity load quantity at each moment in the day and the generated energy of the used generator set of the iron and steel enterprise; determining a carbon dioxide emission factor of electric power at each moment in the day according to the electricity load quantity at each moment in the day and the generated energy of the used generator set; determining the daily indirect carbon emission of the iron and steel enterprises according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day; and summing the direct carbon emission and the indirect carbon emission of the iron and steel enterprises every day to obtain the total carbon emission of the iron and steel enterprises every day. The accurate measurement of the carbon emission of iron and steel enterprises is realized.
Description
Technical Field
The invention relates to the technical field of carbon emission monitoring, in particular to a method, a system, equipment and a medium for measuring carbon emission in the steel industry.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The carbon emission in the steel industry is inferior to the carbon emission in the electric power industry, and the carbon emission in the steel industry is measured and tracked, so that guidance can be provided for improving production and reducing carbon emission, and an effective energy-saving and emission-reducing scheme is formulated according to the carbon emission.
The total carbon emission amount of a certain iron and steel enterprise is calculated mainly by calculating the direct carbon emission amount generated by burning fossil fuel, the direct carbon emission amount generated in the production process and the indirect carbon emission amount obtained by calculating the carbon dioxide emission factors of electric load and electric power, the carbon dioxide emission factors of electric power are obtained by dividing the total carbon emission and the total power generation amount of all power plants in regional or provincial power grid jurisdiction, the influence of different energy consumption modes of the iron and steel enterprise on the carbon emission amount is not considered, and the carbon dioxide emission factors of electric power are selected too coarsely, so that the carbon emission amount of each iron and steel enterprise cannot be accurately estimated, and the measurement result of the carbon emission of the iron and steel enterprise is inaccurate.
Disclosure of Invention
In order to solve the problems, the invention provides a carbon emission measuring method, a system, equipment and a medium for the steel industry, which are used for calculating and obtaining a carbon dioxide emission factor of electric power at each moment through daily outsourcing electric quantity of a steel enterprise, electric load at each moment and electric energy generation quantity of a generator set at each moment, and can be used for accurately obtaining indirect carbon emission of the steel enterprise according to the factor, so that the accurate measurement of the carbon emission of the steel enterprise is realized.
In order to achieve the above purpose, the invention adopts the following technical scheme:
In a first aspect, a method for measuring carbon emission in the steel industry is provided, including:
acquiring the direct carbon emission, outsourcing electric quantity, the electricity load quantity at each moment in the day and the generated energy of the used generator set of the iron and steel enterprise;
Determining a carbon dioxide emission factor of electric power at each moment in the day according to the electricity load quantity at each moment in the day and the generated energy of the used generator set;
determining the daily indirect carbon emission of the iron and steel enterprises according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day;
And summing the direct carbon emission and the indirect carbon emission of the iron and steel enterprises every day to obtain the total carbon emission of the iron and steel enterprises every day.
In a second aspect, a carbon emission measurement system in the steel industry is provided, comprising:
the data acquisition module is used for acquiring the direct carbon emission, outsourcing electric quantity, the electricity load quantity at each moment in the day and the generated energy of the used generator set of the iron and steel enterprise;
the carbon dioxide emission factor determining module of the electric power is used for determining the carbon dioxide emission factor of the electric power at each moment in the day according to the electricity load quantity at each moment in the day and the generated energy of the used generator set;
The indirect carbon emission determining module is used for determining the daily indirect carbon emission of the iron and steel enterprises according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day;
and the total daily carbon emission determining module of the iron and steel enterprises is used for summing the direct carbon emission and the indirect carbon emission of the iron and steel enterprises to obtain the total daily carbon emission of the iron and steel enterprises.
In a third aspect, an electronic device is provided that includes a memory and a processor, and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform the steps of a method for measuring carbon emissions in the steel industry.
In a fourth aspect, a computer readable storage medium is provided for storing computer instructions that, when executed by a processor, perform the steps of a method for measuring carbon emissions in the steel industry.
Compared with the prior art, the invention has the beneficial effects that:
1. When the carbon emission of the iron and steel enterprises is measured, the influence of the energy consumption mode of the iron and steel enterprises on the carbon emission is fully considered, and the carbon dioxide emission factor of the electric power at each moment is obtained through calculation by the daily outsourcing electric quantity of the iron and steel enterprises, the electric load at each moment and the electric energy generation quantity of the generator set at each moment, so that the indirect carbon emission of the iron and steel enterprises can be accurately obtained according to the factor, and the accurate measurement of the carbon emission of the iron and steel enterprises is realized.
2. When the method is used for calculating the direct carbon emission, not only the carbon emission caused by the combustion of fossil fuel is considered, but also the carbon emission generated by flux consumption, electrode consumption and carbon-containing raw material consumption in the production process is considered, so that the total daily carbon emission of the finally obtained iron and steel enterprises is more accurate.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a flow chart of the method disclosed in example 1;
FIG. 2 is a production flow (long flow) diagram of the iron and steel industry;
FIG. 3 is a schematic view of carbon emissions during steel production;
FIG. 4 is a graph showing the change in electric load of the steel plant A2023, 3 and 19 days disclosed in example 1;
FIG. 5 is a graph of the change in output of the renewable energy unit at 24 times 19/3/day in iron and steel plant 2023 disclosed in example 1;
Fig. 6 is a graph showing changes in the electricity carbon emission factor at 24 times 19/3/month in 2023 of iron and steel plant a disclosed in example 1.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1
In this embodiment, a method for measuring carbon emissions in the steel industry is disclosed, as shown in fig. 1 to 6, comprising:
acquiring the direct carbon emission, outsourcing electric quantity, the electricity load quantity at each moment in the day and the generated energy of the used generator set of the iron and steel enterprise;
Determining a carbon dioxide emission factor of electric power at each moment in the day according to the electricity load quantity at each moment in the day and the generated energy of the used generator set;
determining the daily indirect carbon emission of the iron and steel enterprises according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day;
And summing the direct carbon emission and the indirect carbon emission of the iron and steel enterprises every day to obtain the total carbon emission of the iron and steel enterprises every day.
Before carbon emission measurement is carried out on a certain iron and steel enterprise, firstly, analyzing production procedures and process characteristics of the iron and steel industry, researching direct carbon emission and indirect carbon emission conditions of all links in the production process, and analyzing key factors of carbon emission of the iron and steel enterprise; then, constructing a direct carbon emission accounting model of the iron and steel enterprise aiming at the direct carbon emission of the iron and steel enterprise; aiming at indirect carbon emission of the steel industry, taking energy consumption modes of different steel enterprises into consideration, carrying out fine accounting on carbon dioxide emission factors of electric power in a time dimension, and constructing an indirect carbon emission accounting model of the steel enterprises. When the carbon emission measurement is carried out on the iron and steel enterprises, the total daily carbon emission of the iron and steel enterprises is obtained by utilizing the direct carbon emission accounting model and the indirect carbon emission accounting model.
The production process of steel production comprises a long process and a short process, carbon emission conditions of different processes are respectively researched, and key factors influencing the carbon emission of steel enterprises are further analyzed and obtained.
The production of steel is highly dependent on mineral resources and fossil energy, so that the steel production can generate a large amount of greenhouse gases, and has a great influence on the environment. The primary emissions from the steel industry are carbon dioxide (CO 2).
From the viewpoint of the steel production process, the current steel production flow mainly comprises two types: "long flow" and "short flow". The "long process" refers to blast furnace-converter steelmaking using natural resources such as iron ore and coal as sources, and the "short process" refers to electric furnace steelmaking using scrap steel and electric power as sources. From the viewpoints of resource use, energy consumption and load on the environment, the "short process" is smaller in resource use and energy consumption than the "long process" and has much smaller influence on the environment. Research shows that compared with the 'short process' taking scrap steel as a main raw material and the 'long process' taking iron ore as a raw material, 113 tons of iron ore can be saved per ton of steel produced, 350 kilograms of standard coal can be reduced in energy consumption, 114 tons of carbon dioxide emission (excluding the carbon dioxide emission generated by electric power in the 'short process') can be reduced, and 600 kilograms of waste residue emission can be reduced. However, the short process has high process cost, so most iron and steel enterprises adopt a long process production process to produce iron and steel, which is one of the reasons for high carbon emission in the iron and steel industry.
The embodiment mainly aims at analyzing and explaining the carbon emission problem in the long-flow steel production process. The production flow of the long flow is shown in figure 2, and the production process comprises a plurality of processes of burning, smelting, roasting and heating, including the production steps of sintering, pelletizing, coking, ironmaking, steelmaking, steel rolling and the like. The greenhouse gases generated by the steel production are mainly as follows: carbon dioxide generated by the combustion of fossil fuels; carbon dioxide generated by chemical reaction in the production process, such as sintering, coking, lime roasting, steel smelting, steel pickling and the like; carbon dioxide generated by electricity and heat is consumed in the process of transporting, loading and unloading and processing raw materials required for steel production. In steel production, carbon is used not only as a reducing agent for iron ore but also as a fuel and a heating source, so carbon dioxide generated in steel production mainly comes from energy consumption mainly of coal. In addition, the iron and steel industry has various problems of high total yield, shortage of waste steel resources, more backward productivity, unreasonable energy structure and the like, and further generates carbon dioxide emission with large total amount.
Exhaust gas discharged from iron and steel enterprises can be generally divided into three categories: the first category is waste gas generated by chemical reaction in the production process, such as sintering, coking, lime roasting, steel smelting, steel pickling and other processes; the second type is the exhaust gas generated by the combustion of fossil fuels in furnaces and kilns; the third category is dust generated during the transportation, loading and unloading of raw materials, processing and the like. Greenhouse gases produced by the steel industry consist mainly of a first type and a second type of exhaust gases. Wherein carbon dioxide emissions generated during steel production and fossil fuel combustion are direct emissions, while carbon emissions generated due to electric and thermal consumption are indirect emissions, and the specific carbon emissions process is shown in fig. 3.
The main factors affecting the carbon emission of iron and steel enterprises include: energy consumption structure, energy efficiency, and processes and technologies.
Among all fossil energy sources used in the steel industry, coal and coke are low heating value, high carbon dioxide emission coefficient energy sources, and their contribution rate to carbon dioxide emission is greatest. The energy consumed in the steel industry can be divided into three categories, namely coal-based energy, petroleum-based energy and electricity. In the energy consumption of the steel industry, coal energy and electric power consumption account for a large part, and electric power is mainly supplied by thermal power, wherein the consumption of the coal energy accounts for a large part. The coal energy has low heat value and high carbon emission coefficient compared with other energy sources, and has large ratio in energy consumption in the steel industry, so the coal energy has great contribution to carbon dioxide emission. Therefore, the energy consumption structure has become one of the main influencing factors of carbon dioxide emission in the steel industry.
Energy efficiency is also one of the main influencing factors of carbon dioxide emission in the steel industry. When the energy efficiency of the steel industry is improved, the carbon dioxide emission of the steel industry can be reduced.
The procedures and the technology in the steel production process are also the main factors influencing the carbon dioxide emission in the steel industry. Carbon dioxide emissions from steel production are produced by chemical reactions in the production process in addition to fossil fuel combustion. The principle of iron and steel production is to utilize ore resources such as coal, iron ore and the like to carry out a series of chemical reactions, namely, reducing the iron ore by taking carbon as a reducing agent to obtain a final product. In this process, coal and coke are the primary fuels in steel-making coke ovens, blast furnaces and converters that burn to produce carbon dioxide that is vented to the atmosphere.
The sintering, coking, lime roasting, steel smelting, steel pickling and other processes in the production flow can generate a certain amount of carbon dioxide. Among these, carbon dioxide generated by the reduction reaction in the iron-making process is the main component, and the iron-making process is the process that consumes the most energy.
The steel production is mainly completed by an electric furnace and a converter. The two processes need different energy sources, and the production of the converter steel can discharge more carbon dioxide than the production of the electric furnace steel, so that the ratio of converter steelmaking to electric furnace steelmaking can also have a certain influence on the carbon emission in the steel industry. In addition, the cold rolling ratio, the continuous casting ratio and the external refining ratio have certain influence on the energy structure and the consumption condition of the steel industry, and further indirectly influence the carbon dioxide emission condition of the steel industry.
Carbon emissions are classified into three categories according to the cause of carbon emissions generated during steel production: carbon emissions from the combustion of fossil fuels; carbon emissions from chemical reactions during production; indirect carbon emission caused by electric power and heat consumption in steel production. Carbon emissions in steel production are mainly due to energy consumption during production.
Carbon emissions from chemical reactions during production, including flux consumption, electrode consumption, and carbon emissions from carbon-containing feedstock consumption during steel production.
The direct carbon emission amount per day of the iron and steel enterprises obtained in the present embodiment includes the carbon emission amount produced by the combustion of fossil fuel and the carbon emission amount produced in the production process including the flux consumption, the electrode consumption and the carbon-containing raw material consumption, by obtaining the fossil fuel consumption amount, the flux consumption amount, the electrode consumption amount and the carbon-containing raw material consumption per day of the iron and steel enterprises; and calculating and obtaining the daily direct carbon emission of the iron and steel enterprises according to the daily fossil fuel consumption, the flux consumption, the electrode consumption and the carbon-containing raw material consumption.
Specifically, according to the daily fossil fuel consumption and the carbon dioxide emission factor of the fossil fuel, calculating and obtaining the carbon emission generated by the combustion of the fossil fuel;
calculating and obtaining carbon emission generated by the consumption of the flux according to the consumption of the flux and the carbon dioxide emission factor of the flux;
according to the consumption of the electrode and the carbon dioxide emission factor of the electrode, calculating and obtaining the carbon emission generated by the consumption of the electrode;
Calculating and obtaining carbon emission generated by the consumption of the carbon-containing raw material according to the consumption of the carbon-containing raw material and the carbon dioxide emission factor of the carbon-containing raw material;
The direct carbon emission of the iron and steel enterprises per day is obtained by summing the carbon emission generated by the combustion of fossil fuel, the carbon emission generated by the consumption of flux, the carbon emission generated by the consumption of electrode and the carbon emission generated by the consumption of carbon-containing raw material.
Among them, fossil fuels consumed in the steel industry include: coal, crude oil, gasoline, kerosene, diesel oil, fuel oil, natural gas, and the like. The amount of carbon emissions produced for fossil fuel combustion can be calculated using equation (1):
（1）
In the method, in the process of the invention, Carbon emissions produced for fossil fuel combustion in tons (tCO 2); /(I)Is the activity level of the ith fossil fuel in steel production, in millions of kilojoules (GJ); /(I)The carbon dioxide emission factor for the combustion of the ith fossil fuel in steel production is given in the unit of tCO 2/GJ.
Activity level of ith fossil fuel in iron and steel productionThe method comprises the following steps:
（2）
In the method, in the process of the invention, For the average low-grade heating value of the ith fossil fuel, the unit is millions of kilojoules per ton (GJ/t) for solid or liquid fuel and millions of kilojoules per ten cubic meters (GJ/ten thousand m 3) for gas fuel, the default value issued by provinces where iron and steel enterprises are located is adopted in the embodiment; /(I)Is the i-th fossil fuel consumption in tons (t) for solid or liquid fuels; for gaseous fuels, the unit is ten thousand cubic meters (ten thousand meters 3).
When the method is applied to different iron and steel plants, the types of fossil fuels are adjusted according to the actual production conditions of the iron and steel plants so as to participate in calculation.
Carbon dioxide emission factor of ith fossil fuelThe method comprises the following steps:
（3）
In the method, in the process of the invention, For the unit calorific value carbon content of the ith fossil fuel, the unit is ton carbon/million kilojoules (tC/GJ), and the default value issued by the province of the iron and steel enterprise is adopted in the embodiment; /(I)The unit of the carbon oxidation rate of the ith fossil fuel is the default value issued by the province of the iron and steel enterprise.
In this embodiment, after the activity level of the fossil fuel and the carbon dioxide emission factor of the fossil fuel are calculated according to the formula (2) and the formula (3), the daily fossil fuel consumption, the activity level of the fossil fuel and the carbon dioxide emission factor of the fossil fuel are substituted into the formula (1), and the carbon emission amount generated by the combustion of the fossil fuel is calculated.
Carbon emissions produced during steel productionIncluding the amount of carbon emissions from flux consumption/>Carbon emission from electrode consumption/>And carbon emissions/>, resulting from consumption of carbonaceous feedstockThe method specifically comprises the following steps:
（4）
Carbon emissions from flux consumption The method comprises the following steps:
（5）
In the method, in the process of the invention, The unit is ton (t) for the i-th flux consumption; /(I)The unit of the emission factor of CO 2 of the ith flux is tCO 2/t, and the default value issued by the province of the iron and steel enterprise is adopted in the embodiment.
Substituting the daily flux consumption amount into the formula (5), and calculating to obtain the carbon emission amount generated by the daily flux consumption.
In the production process of common steel, the flux mainly considers the consumption of limestone, dolomite and the minimum materials contained in the limestone, wherein the dolomite comprises the consumption of dolomite powder and dolomite blocks, and the limestone comprises the consumption of limestone and limestone blocks produced by a lime kiln. When the method is applied to different iron and steel enterprises, the production conditions of the root iron and steel enterprises adjust the flux types to participate in calculation.
Carbon emissions from electrode consumptionThe method comprises the following steps:
（6）
In the method, in the process of the invention, The electrode consumption in the processes of electric furnace steelmaking, refining furnace and the like is expressed as ton (t); /(I)The carbon dioxide emission factor of the consumed electrode of the electric furnace steelmaking, the refining furnace and the like is expressed as t CO 2/t.
Substituting the daily electrode consumption amount into the formula (6), and calculating to obtain the carbon emission amount generated by the daily electrode consumption.
Carbon emission amount due to consumption of carbon-containing raw materials such as pig iron, scrap steel, ferroalloy and the likeThe method comprises the following steps:
（7）
In the method, in the process of the invention, Is the i-th consumption of carbonaceous feedstock in tons (t); /(I)The carbon dioxide emission factor for the i-th carbonaceous feedstock purchased is given in the unit of tCO 2/t.
Substituting the daily consumption of the carbonaceous raw material into the formula (7), and calculating to obtain the carbon emission amount generated by daily consumption of the carbonaceous raw material.
Formulas (1) - (7) constitute a direct carbon emission accounting model for the iron and steel enterprise.
Summing the carbon emission amount generated by the consumption of the flux, the carbon emission amount generated by the consumption of the electrode and the carbon emission amount generated by the consumption of the carbon-containing raw material by using the formula (4), and calculating to obtain the carbon emission amount generated in the production process of steel every day; and summing the carbon emission generated in the steel production process and the carbon emission generated by burning the fossil fuel every day, and calculating to obtain the direct carbon emission of the steel enterprises every day.
The indirect carbon emission amount of the iron and steel enterprises obtained in the embodiment comprises the indirect carbon emission amount generated by the electricity outsourcing and the indirect carbon emission amount generated by the steam outsourcing of the iron and steel enterprises;
according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day, determining the indirect carbon emission quantity generated by the outsourcing electric power of the iron and steel enterprise every day;
Obtaining the daily outsourcing steam quantity of an iron and steel enterprise;
determining the indirect carbon emission amount generated by the steam outsourced by the iron and steel enterprises every day according to the steam outsourcing amount and the carbon dioxide emission factor of the steam;
The sum of the indirect carbon emission generated by the outsourcing electricity and the indirect carbon emission generated by the outsourcing steam of the iron and steel enterprises is the indirect carbon emission of the iron and steel enterprises every day.
The power generation unit comprises a coal-fired unit and a renewable energy unit;
Acquiring the generated energy of each unit at each moment in a day;
According to the generated energy of each unit at each time in a day, the electric load of each time in a day of a steel enterprise and the carbon emission coefficient of each unit, determining the carbon dioxide emission factor of electric power at each time in the day, and specifically:
Multiplying the generated energy of each unit at each time in one day by the electricity load of each time in one day of the iron and steel enterprise, and then obtaining the carbon dioxide emission factor of each unit at each time in one day;
And summing the carbon dioxide emission factors of all the units to obtain the carbon dioxide emission factor of the electric power at each moment in the day.
In addition to the direct carbon emissions generated directly by the combustion and reduction reactions of fossil fuels, the carbon dioxide emissions generated in the production of steel also generate indirect carbon emissions due to the consumption of electricity and heat in the production process, and the generated indirect carbon emissions are generatedThe method comprises the following steps:
（8）
In the method, in the process of the invention, The method is an indirect carbon emission amount of iron and steel enterprises every day; /(I)The electricity quantity is purchased for the iron and steel enterprises daily; the steam quantity is purchased for iron and steel enterprises every day; /(I) As the carbon dioxide emission factor of the steam, the embodiment adopts a default value issued by the province of the iron and steel enterprise; /(I)Is the carbon dioxide emission factor of the electricity.
The carbon dioxide emission factor of the electric power at the electricity utilization side is the carbon emission generated by each consumption of electricity, and is mainly obtained by dividing the total carbon emission of all power plants in regional or provincial power grid jurisdiction by the total power generation amount at present. The method is a key bridge for connecting the electric energy consumption and the carbon emission of enterprises, and has important significance for accurately evaluating the carbon emission of each enterprise, promoting the power enterprises to actively take measures of energy conservation and emission reduction and promoting the consumption of new energy, wherein the calculation mode of the method is reasonable and is consistent with the actual running condition of a power system. The existing method for calculating the carbon dioxide emission factor of the electric power mainly has the following problems:
1) The data is not updated timely enough, and hysteresis exists;
2) The electricity consumption carbon emission conditions of different time periods and different areas cannot be reflected, and the electricity consumption characteristics of different industries and different enterprises cannot be distinguished;
3) The method has the advantages that the method only has a statistical accounting function, can not effectively promote enterprises to actively take measures to reduce carbon emission, and can not stimulate the enterprises to more dissipate new energy power.
According to the embodiment, aiming at the energy utilization modes of different iron and steel enterprises, the carbon dioxide emission factors of the electric power are subjected to refined accounting in the time dimension, the carbon dioxide emission factors of the electric power are not relatively fixed values any more, but can change in real time along with the power generation structure and the power utilization behavior, the carbon dioxide emission factors of the electric power of the iron and steel enterprises with different power utilization time are different, and the carbon dioxide emission factors of the electric power of the embodiment are as follows:
（9）
In the method, in the process of the invention, Carbon dioxide emission factor for the power at time t; /(I)Generating energy of the coal-fired unit at the time t; /(I)Generating energy of the renewable energy unit at the time t; /(I)The electricity load quantity at the moment t of the iron and steel enterprise; /(I)AndThe carbon emission coefficients of the coal-fired unit and the renewable energy unit are respectively.
At present, the electricity sources of iron and steel enterprises mainly comprise outsourcing electricity and power generation of power plants of the enterprises, more and more iron and steel enterprises select self-contained electricity as an important means for saving energy and reducing cost, and new energy power generation does not generate any carbon emission, so that more and more enterprises are promoted to improve the installation level of renewable energy sources, and the purposes of saving energy and reducing emission are achieved.
Formulas (8) - (9) constitute an indirect carbon emission accounting model for the iron and steel enterprise.
In the embodiment, the outsourcing electric quantity of each day of the iron and steel enterprise and the generated energy of each unit at each moment are substituted into a formula (9) to calculate and obtain the carbon dioxide emission factor of the electric power at each moment; substituting the carbon dioxide emission factor of the electric power at each moment, the outsourcing steam quantity and the outsourcing electric quantity in the formula (8) to calculate and obtain the indirect carbon emission quantity of the iron and steel enterprises in each day.
And summing the indirect carbon emission amount and the direct carbon emission amount of the iron and steel enterprises every day, and calculating to obtain the total carbon emission amount of the iron and steel enterprises every day.
The embodiment can provide related suggestions for energy conservation and emission reduction of the iron and steel enterprises by obtaining the carbon emission generated by burning fossil fuel, the carbon emission generated in the iron and steel production process, the indirect carbon emission and the total daily carbon emission of the iron and steel enterprises and analyzing the carbon emission.
To illustrate the effect of the method disclosed in this example, taking the production data of the steel works a as an example, the validity of the direct carbon emission accounting model and the indirect carbon emission accounting model of the steel enterprises proposed in this example was verified.
Case analysis was performed based on production data of steel plant a, 2023, 3 and 19 days.
(1) And (5) analyzing the effectiveness of a direct carbon emission accounting model of the iron and steel enterprises.
The method comprises the steps of obtaining the daily consumption of various fossil fuels in steel works, the consumption of solvent dolomite and limestone, the electrode quality consumed by electric furnace steelmaking and refining furnaces, the consumption of carbon-containing raw materials such as pig iron, scrap steel, ferroalloy and the like, and obtaining the carbon emission generated by burning the fossil fuels, the carbon emission generated in the steel production process and the direct carbon emission through direct carbon emission accounting model operation.
The use condition of fossil energy and the default values of relevant parameters of enterprises in 2023, 3 and 19 days of steel plant A are shown in Table 1.
TABLE 1
According to formulas (1) - (3), the calculation of the carbon emissions produced by the combustion of fossil fuels is performed.
The flux consumption and carbon dioxide emission factors of the enterprises in 2023, 3 and 19 days of steel plant A are shown in Table 2.
TABLE 2
According to the formula (5), the calculation of the carbon emission amount due to the flux consumption is performed.
The electrode consumption and carbon dioxide emission factors of steel plant 2023, 3 and 19 days are shown in Table 3.
TABLE 3 Table 3
According to the formula (6), the calculation of the carbon emission amount generated by the electrode consumption is performed.
The consumption of carbon-containing raw materials such as pig iron, scrap steel, ferroalloy and the like and the carbon dioxide emission factors of enterprises in 2023, 3 and 19 days are shown in Table 4.
TABLE 4 Table 4
According to the formula (7), the calculation of the carbon emission amount generated by the consumption of the carbonaceous material is performed.
(2) And (5) analyzing the effectiveness of an indirect carbon emission accounting model of the iron and steel enterprises.
FIG. 4 is a graph of the electricity load of steel plant A, 2023, month 19. Since the production is not stopped for 24 hours in the steel industry, the electricity consumption is very stable, and therefore, the daily electricity load curve can be seen to be very stable.
A, a coal-fired unit and a renewable energy unit are assembled in the iron and steel plant, the carbon emission coefficient of the renewable energy unit is 0, the carbon emission coefficient of the coal-fired unit is 0.8843 t/MWh, different values of carbon dioxide emission factors of electric power at 24 moments are calculated according to the output conditions of the two units at 24 moments, as shown in FIG. 6, and FIG. 5 is a graph of output change of the renewable energy unit at 24 moments of 2023, 3, 19 and 19 of the iron and steel plant A.
According to the change curve graph of the carbon dioxide emission factor of the electric power, when the output of the renewable energy unit is higher, the electricity consumption is cleaner, the generated carbon emission is less, so that enterprises can be guided to use electricity in a period of higher output level of the renewable energy, and the level of the renewable energy consumed by the system is effectively improved.
The amount of thermal steam and carbon dioxide emissions factors purchased by enterprises in steel plant 2023, 3 and 19 days are shown in Table 5.
TABLE 5
And (3) performing indirect carbon emission calculation according to formulas (8) and (9).
The total carbon emission of 2023, 3 and 19 days was obtained by model calculation, and the results are shown in Table 6.
TABLE 6
As is clear from the table, the total amount of carbon emissions in the steel plant A was 43086.007t, and the amounts of carbon emissions generated by burning fossil fuel, carbon emissions generated during steel production, and indirect carbon emissions were 30821.561t, 1016.571t, and 11247.875t, respectively, at day 3 and 19 of 2023. The data in the table can directly reflect that the most critical factors affecting the carbon emission and strength of the enterprise are the carbon emission caused by the combustion of fossil fuel and the consumption of electricity and heat. Therefore, the construction of an energy consumption system taking low carbon and high efficiency as targets and a novel power system taking new energy consumption as a main body should be quickened, the consumption of fossil raw materials such as coal is strictly controlled, the energy consumption structure taking coal as a main body is continuously improved, meanwhile, the renewable energy technology is greatly developed, the specific gravity of thermal power generation is reduced, the specific gravity of renewable energy power generation such as wind power and photovoltaic is increased, the multi-energy complementary optimization energy structure is realized, the low carbonization development of the steel industry in the aspect of the energy consumption structure is promoted, and the carbon emission of the steel industry is effectively reduced.
According to the method disclosed by the embodiment, when the carbon emission of the iron and steel enterprises is measured, the influence of the energy consumption mode of the iron and steel enterprises on the carbon emission is fully considered, and the carbon dioxide emission factor of the electric power at each moment is obtained through calculation of the daily outsourcing electric quantity of the iron and steel enterprises, the electric load at each moment and the electric energy generation quantity of the generator set at each moment, so that the indirect carbon emission of the iron and steel enterprises can be accurately obtained according to the factor, and the accurate measurement of the carbon emission of the iron and steel enterprises is realized.
Example 2
In this embodiment, a carbon emission measurement system for the steel industry is disclosed, comprising:
the data acquisition module is used for acquiring the direct carbon emission, outsourcing electric quantity, the electricity load quantity at each moment in the day and the generated energy of the used generator set of the iron and steel enterprise;
the carbon dioxide emission factor determining module of the electric power is used for determining the carbon dioxide emission factor of the electric power at each moment in the day according to the electricity load quantity at each moment in the day and the generated energy of the used generator set;
The indirect carbon emission determining module is used for determining the daily indirect carbon emission of the iron and steel enterprises according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day;
and the total daily carbon emission determining module of the iron and steel enterprises is used for summing the direct carbon emission and the indirect carbon emission of the iron and steel enterprises to obtain the total daily carbon emission of the iron and steel enterprises.
Example 3
In this embodiment, an electronic device is disclosed that includes a memory and a processor, and computer instructions stored on the memory and running on the processor that, when executed by the processor, perform the steps recited in a method for measuring carbon emissions in the steel industry disclosed in embodiment 1.
Example 4
In this embodiment, a computer readable storage medium is disclosed for storing computer instructions that, when executed by a processor, perform the steps of a method for measuring carbon emissions in the steel industry disclosed in embodiment 1.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (8)
1. The carbon emission measuring method in the steel industry is characterized by comprising the following steps of:
acquiring the direct carbon emission, outsourcing electric quantity, the electricity load quantity at each moment in the day and the generated energy of the used generator set of the iron and steel enterprise;
According to the electricity load quantity at each time in the day and the generated energy of the used generator set, determining the carbon oxide emission factor of the electric power at each time in the day; the generator set comprises a coal-fired unit and a renewable energy unit;
Acquiring the generated energy of each unit at each moment in a day;
Determining a carbon dioxide emission factor of electric power at each moment in the day according to the generated energy of each moment in the day of each unit, the electric load amount of each moment in the day of the iron and steel enterprise and the carbon emission coefficient of each unit;
Multiplying the generated energy of each unit at each time in one day by the electricity load of each time in one day of the iron and steel enterprise, and then obtaining the carbon dioxide emission factor of each unit at each time in one day;
Summing the carbon dioxide emission factors of all the units to obtain the carbon dioxide emission factor of the electric power at each moment in the day; specifically, the carbon dioxide emission factor of the electricity is:
In the method, in the process of the invention, Carbon dioxide emission factor for the power at time t; /(I)Generating energy of the coal-fired unit at the time t; generating energy of the renewable energy unit at the time t; /(I) The electricity load quantity at the moment t of the iron and steel enterprise; /(I)AndCarbon emission coefficients of the coal-fired unit and the renewable energy unit respectively;
determining the daily indirect carbon emission of the iron and steel enterprises according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day; specifically, the indirect carbon emissions produced The method comprises the following steps:
In the method, in the process of the invention, The method is an indirect carbon emission amount of iron and steel enterprises every day; /(I)The electricity quantity is purchased for the iron and steel enterprises daily; /(I)The steam quantity is purchased for iron and steel enterprises every day; /(I)Is the carbon dioxide emission factor of steam,/>Carbon dioxide emissions factor for electricity;
And summing the direct carbon emission and the indirect carbon emission of the iron and steel enterprises every day to obtain the total carbon emission of the iron and steel enterprises every day.
2. The method for measuring carbon emissions in the steel industry as claimed in claim 1, wherein the direct carbon emissions include carbon emissions generated by combustion of fossil fuel and carbon emissions generated by flux consumption, electrode consumption and carbon-containing raw material consumption.
3. The method for measuring carbon emissions in the steel industry as claimed in claim 2, wherein fossil fuel consumption, flux consumption, electrode consumption and carbon-containing raw material consumption of a steel enterprise per day are obtained;
and calculating and obtaining the daily direct carbon emission of the iron and steel enterprises according to the daily fossil fuel consumption, the flux consumption, the electrode consumption and the carbon-containing raw material consumption.
4. A method for measuring carbon emissions in the steel industry as claimed in claim 3, wherein the amount of carbon emissions generated by burning fossil fuel is calculated based on the daily fossil fuel consumption and the carbon dioxide emission factor of fossil fuel;
calculating and obtaining carbon emission generated by the consumption of the flux according to the consumption of the flux and the carbon dioxide emission factor of the flux;
according to the consumption of the electrode and the carbon dioxide emission factor of the electrode, calculating and obtaining the carbon emission generated by the consumption of the electrode;
Calculating and obtaining carbon emission generated by the consumption of the carbon-containing raw material according to the consumption of the carbon-containing raw material and the carbon dioxide emission factor of the carbon-containing raw material;
The direct carbon emission of the iron and steel enterprises per day is obtained by summing the carbon emission generated by the combustion of fossil fuel, the carbon emission generated by the consumption of flux, the carbon emission generated by the consumption of electrode and the carbon emission generated by the consumption of carbon-containing raw material.
5. The method for measuring carbon emissions in the steel industry of claim 1, wherein the indirect carbon emissions include indirect carbon emissions generated by daily outsourcing electricity and indirect carbon emissions generated by outsourcing steam in a steel enterprise;
according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day, determining the indirect carbon emission quantity generated by the outsourcing electric power of the iron and steel enterprise every day;
Obtaining the daily outsourcing steam quantity of an iron and steel enterprise;
determining the indirect carbon emission amount generated by the steam outsourced by the iron and steel enterprises every day according to the steam outsourcing amount and the carbon dioxide emission factor of the steam;
The sum of the indirect carbon emission generated by the outsourcing electricity and the indirect carbon emission generated by the outsourcing steam of the iron and steel enterprises is the indirect carbon emission of the iron and steel enterprises every day.
6. A steel industry carbon emission measurement system, comprising:
the data acquisition module is used for acquiring the direct carbon emission, outsourcing electric quantity, the electricity load quantity at each moment in the day and the generated energy of the used generator set of the iron and steel enterprise;
The carbon dioxide emission factor determining module of the electric power is used for determining the carbon dioxide emission factor of the electric power at each moment in the day according to the electricity load quantity at each moment in the day and the generated energy of the used generator set; the generator set comprises a coal-fired unit and a renewable energy unit;
Acquiring the generated energy of each unit at each moment in a day;
Determining a carbon dioxide emission factor of electric power at each moment in the day according to the generated energy of each moment in the day of each unit, the electric load amount of each moment in the day of the iron and steel enterprise and the carbon emission coefficient of each unit;
Multiplying the generated energy of each unit at each time in one day by the electricity load of each time in one day of the iron and steel enterprise, and then obtaining the carbon dioxide emission factor of each unit at each time in one day;
Summing the carbon dioxide emission factors of all the units to obtain the carbon dioxide emission factor of the electric power at each moment in the day; specifically, the carbon dioxide emission factor of the electricity is:
In the method, in the process of the invention, Carbon dioxide emission factor for the power at time t; /(I)Generating energy of the coal-fired unit at the time t; generating energy of the renewable energy unit at the time t; /(I) The electricity load quantity at the moment t of the iron and steel enterprise; /(I)AndCarbon emission coefficients of the coal-fired unit and the renewable energy unit respectively;
The indirect carbon emission determining module is used for determining the daily indirect carbon emission of the iron and steel enterprises according to the outsourcing electric quantity and the carbon dioxide emission factor of the electric power at each moment in the day; specifically, the indirect carbon emissions produced The method comprises the following steps:
In the method, in the process of the invention, The method is an indirect carbon emission amount of iron and steel enterprises every day; /(I)The electricity quantity is purchased for the iron and steel enterprises daily; /(I)The steam quantity is purchased for iron and steel enterprises every day; /(I)Is the carbon dioxide emission factor of steam,/>Carbon dioxide emissions factor for electricity;
and the total daily carbon emission determining module of the iron and steel enterprises is used for summing the direct carbon emission and the indirect carbon emission of the iron and steel enterprises to obtain the total daily carbon emission of the iron and steel enterprises.
7. An electronic device comprising a memory and a processor and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform the steps of a method for measuring carbon emissions in the steel industry as claimed in any one of claims 1 to 5.
8. A computer readable storage medium storing computer instructions which, when executed by a processor, perform the steps of a method for measuring carbon emissions in the steel industry as claimed in any one of claims 1 to 5.
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