A refined accounting method for carbon emissions from high-energy-consuming enterprises

Abstract

The present invention discloses a method for fine-grained carbon emission accounting for high-energy-consuming enterprises, belonging to the technical field of energy conservation and carbon reduction in high-energy-consuming industries. The present invention fully considers the situation of unorganized flue gas emissions in the production process of high-energy-consuming enterprises, and adopts the actual measurement method and the emission factor method to achieve accurate quantification of unorganized carbon emissions generated by fuel combustion and unorganized carbon emissions generated by the use of carbon-containing raw materials. At the same time, the actual measurement method and the emission factor method are combined to calculate the emissions through the exhaust pipe and indirect carbon emissions, solving the problems of low data accuracy and poor adaptability in the actual measurement method for carbon emission accounting of high-energy-consuming enterprises. The method effectively improves the accuracy of carbon emission accounting data, realizes the fine-grained accounting of carbon emissions of high-energy-consuming enterprises and the accurate quantification of carbon emissions, provides accurate carbon emission data for high-energy-consuming enterprises to implement carbon emission management and participate in carbon market transactions, and provides guidance for high-energy-consuming enterprises to carry out energy conservation and carbon reduction work.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy conservation and carbon reduction in high-energy-consuming industries, and specifically relates to a method for fine-grained accounting of carbon emissions in high-energy-consuming enterprises. Background Art

[0002] High-energy-consuming enterprises such as steel, nonferrous metals, and building materials are key to controlling carbon emissions in the industrial sector. High-energy-consuming enterprises should combine their own carbon emission characteristics, strengthen carbon emission accounting work and formulate corresponding carbon reduction measures.

[0003] Currently, high-energy-consuming enterprises use three methods to calculate carbon emissions: the carbon emission factor method, the material balance method (mass balance method), and the actual measurement method. The carbon emission factor method has a relatively simple calculation process, but the widely used CO2 emission factors for various fuels are less adaptable to high-energy-consuming enterprises. The CO2 emission factors often need to be re-determined based on the enterprise's actual energy usage. Furthermore, it requires periodic collection of solid, gaseous, and liquid fuel consumption data, as well as testing of the carbon content of fossil fuels. These testing results must be approved by the CMA or CNAS. This results in a large amount of collected data and significant errors in the calculation process. The material balance method, based on the law of conservation of mass, is highly scientific and effective. However, it requires a comprehensive understanding of the production processes of high-energy-consuming enterprises, the collection of detailed industrial production process data, and on-site data collection. Furthermore, it requires accurate and reliable data, making the calculation process relatively complex and cumbersome. The actual measurement method obtains carbon emissions based on measured data from emission sources, reducing the number of intermediate links. However, the actual measurement method's calculation process is less sophisticated and fails to consider carbon emissions from intermediate links in the production process. The sintering, pelletizing, coking, ironmaking, steelmaking, and rolling processes in steel production contain numerous unorganized carbon emission sources, characterized by strong intermittent nature, small individual sources, and large total amounts. High-energy-consuming enterprises, such as those in the steel, nonferrous metals, and building materials industries, experience unorganized flue gas emissions from intermediate stages of their production processes. The lack of accounting methods for unorganized carbon emissions from these high-energy-consuming enterprises results in low accuracy in carbon emission accounting data based on field measurement methods, making field measurement methods less suitable for carbon emission accounting for high-energy-consuming enterprises. Therefore, for high-energy-consuming enterprises such as steel, nonferrous metals, and building materials industries, achieving refined carbon emission accounting and precise quantification is a pressing issue in need of improvement in existing technologies. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned prior art, the present invention provides a method for fine-grained carbon emission accounting of high-energy-consuming enterprises.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A refined accounting method for carbon emissions of high-energy-consuming enterprises includes the following steps:

[0007] (1) Collect data on direct carbon emission sources, first unorganized carbon emission sources, second unorganized carbon emission sources and indirect carbon emission sources in the production process of high-energy-consuming enterprises; the first unorganized carbon emission source is the CO2 directly emitted in the form of unorganized emissions from the consumption of flux, carbon-containing chemicals and purchased carbon-containing raw materials in the production process of high-energy-consuming enterprises; the second unorganized carbon emission source is the CO2 emitted by the unorganized flue gas emission sources of high-energy-consuming enterprises. 2；

[0008] (2) Calculate the carbon emissions E from direct carbon emission sources using the actual measurement method 排气筒 ;

[0009] (3) Calculate the carbon emissions E of the first unorganized carbon emission source using the emission factor method 无组织节点 ;

[0010] (4) Calculate the carbon emissions E of the second unorganized carbon emission source using the actual measurement method 无组织源 ;

[0011] (5) Calculate the carbon emissions E from indirect carbon emission sources using the emission factor method 间接源 ;

[0012] (6) According to steps (2)-(5), the total carbon emissions of high-energy-consuming enterprises are obtained as E 总 =E 排气筒 +E 无组织源 +E 间接源 .

[0013] As a preferred embodiment of the present invention, the direct carbon emission sources include CO2 generated by flux, carbon-containing chemicals consumed in the production process of high-energy-consuming enterprises, and CO2 purchased from carbon-containing raw materials, which is mixed with CO2 generated by the combustion of fossil fuels and discharged in a centralized manner through exhaust pipes.

[0014] The flux includes limestone, dolomite, etc.; the carbon-containing chemical agents include soda ash, oxalic acid, etc.; the purchased carbon-containing raw materials include electrodes, pig iron, scrap steel, etc.

[0015] As a preferred embodiment of the present invention, the second unorganized carbon emission source is CO2 emissions generated by unorganized flue gas emission sources of high-energy-consuming enterprises.

[0016] The unorganized emission sources of high-energy-consuming enterprises mainly include unorganized emissions involving particulate matter and unorganized emissions of flue gas, and carbon dioxide only exists in the unorganized emissions of flue gas.

[0017] As a preferred embodiment of the present invention, the indirect carbon emission source is the CO2 emissions generated by the net purchase and use of electricity and heat by high-energy-consuming enterprises.

[0018] As a preferred embodiment of the present invention, in step (2), the carbon emission amount E of the direct carbon emission source is 排气筒 The calculation specifically includes the following steps:

[0019] S2-1: Install a continuous flue gas emission monitoring system (CEMS) on each exhaust pipe in the production process of high-energy-consuming enterprises to collect the real-time wet-based volume concentration of CO2 gas. s , average flow rate of wet flue gas in the cross section Flue gas temperature t s , Flue gas static pressure P s and flue gas moisture content X sw ;

[0020] S2-2: Calculate the CO2 dry mass concentration C of the kth exhaust pipe under standard conditions based on the data collected in step S2-1. dk for:

[0021]

[0022] Among them, C dk is the CO2 dry mass concentration of the kth exhaust pipe under standard conditions, unit: g / m 3 ; C sk is the CO2 wet-base volume concentration of the kth exhaust pipe, in volume percentage, %; X swk is the humidity content of the flue gas from the kth exhaust pipe, in %;

[0023] S2-3: Calculate the dry flue gas volume flow rate Q of the kth exhaust pipe under standard conditions based on the data collected in step S2-1 snk for:

[0024]

[0025] Among them, A k The area of ​​the cross section of the kth exhaust pipe, unit: m 2 ;K V is the velocity field coefficient; is the average flow rate of wet flue gas at the measured section of the kth exhaust pipe, in m / s; t sk is the flue gas temperature of the kth exhaust pipe, in ℃; P atm is atmospheric pressure, unit is: Pa; P sk is the flue gas static pressure (gauge pressure) of the kth exhaust pipe, unit: Pa;

[0026] S2-4: Based on formulas (1) and (2), the carbon emissions of all exhaust pipes of high-energy-consuming enterprises are obtained as E 排气筒 :

[0027]

[0028] l is the total number of exhaust pipes.

[0029] As a preferred embodiment of the present invention, in step (3), the carbon emission amount E of the first unorganized carbon emission source is 无组织节点 The calculation specifically includes:

[0030] S3-1: The number of unorganized carbon emission nodes involving the use of flux, carbon-containing chemicals, and purchased carbon-containing raw materials in the production process of high-energy-consuming enterprises is marked as s, where the tth unorganized carbon emission node t = 1, 2, ..., s;

[0031] S3-2: Unorganized carbon emissions E of flux, carbon-containing chemicals and purchased carbon-containing raw materials at the tth unorganized carbon emission node 无组织节点t :

[0032] E 无组织节点t =M CDt ×E CDt (5);

[0033] Among them, M CDt E is the usage of flux, carbon-containing chemicals and purchased carbon-containing raw materials, unit: t; CDt E is the carbon emission coefficient corresponding to flux, carbon-containing chemicals and purchased carbon-containing raw materials, with the unit being kg(CO2) / t(flux, carbon-containing chemicals and purchased carbon-containing raw materials); 无组织节点t is the unorganized carbon emissions of flux, carbon-containing chemicals and purchased carbon-containing raw materials at the tth unorganized carbon emission node, in kg;

[0034] S3-3: Therefore, the total unorganized carbon emissions from the use of flux, carbon-containing chemicals and purchased carbon-containing raw materials at all nodes of high-energy-consuming enterprises are E 无组织节点 for:

[0035]

[0036] As a preferred embodiment of the present invention, in step (4), the carbon emission amount E of the second unorganized carbon emission source is 无组织源 The accounting specifically includes:

[0037] S4-1: The number of production processes of high-energy-consuming enterprises involving fugitive carbon emission sources generated by fossil fuel combustion is recorded as m, where the i-th production process i = 1, 2, ..., m; the number of fugitive carbon emission sources in each production process is recorded as n, and the j-th fugitive emission source in a production process j = 1, 2, ..., n;

[0038] S4-2: The carbon emissions of the jth fugitive emission source in the production process i of a high-energy-consuming enterprise are recorded as Eij , then the total carbon emissions of the second unorganized carbon emission source of high energy-consuming enterprises is E 无组织源 for:

[0039]

[0040] As a preferred embodiment of the present invention, the carbon emission E of the jth fugitive emission source in the production process i of the high energy-consuming enterprise is ij for:

[0041]

[0042] Among them, K ij C(x) is the correction coefficient of the jth fugitive emission source in the production process i of a high-energy-consuming enterprise; ij The CO2 ground concentration at a distance of x meters from the jth fugitive emission source in the production process i of a high-energy-consuming enterprise along the downwind ground axis is expressed in mg / m 3 ; is the environmental background value of CO2 concentration of the jth fugitive emission source in production process i of high energy-consuming enterprises, in mg / m 3 ; is the average wind speed around the jth fugitive emission source in the production process i of a high-energy-consuming enterprise, in m / s; σ yij is the horizontal diffusion coefficient of flue gas in the horizontal direction perpendicular to the downwind direction at a distance of x meters from the jth fugitive emission source in the production process i of the high-energy-consuming enterprise, in m; zij H is the vertical diffusion coefficient of the flue gas in the vertical direction perpendicular to the downwind direction at a distance of x meters from the jth fugitive emission source in the production process i of the high-energy-consuming enterprise, in m; ij It is the effective emission height of the flue gas from the jth unorganized emission source in the production process i of the high-energy-consuming enterprise, in meters.

[0043] As a preferred embodiment of the present invention, in step (5), the carbon emission amount E of the indirect carbon emission source is 间接源 for:

[0044] E 间接源 =EE e ×E e +EH h ×E h (10);

[0045] Among them, E 间接源 Indirect carbon emission sources, that is, carbon dioxide emissions generated by net purchased electricity and heat, unit: kgCO2; EE e The net electricity purchased is in MW·h; EH hNet heat purchase, unit: GJ; E e is the grid emission factor, unit: kgCO2 / MW·h; E h is the thermal emission factor, unit: kgCO2 / GJ.

[0046] Compared with the existing technology, the beneficial effects of the present invention are: the present invention fully considers the situation of unorganized flue gas emissions in the production process of high-energy-consuming enterprises, and adopts the actual measurement method and the emission factor method to achieve accurate quantification of unorganized carbon emissions generated by fuel combustion and unorganized carbon emissions generated by the use of carbon-containing raw materials. At the same time, the actual measurement method and the emission factor method are combined to calculate the emissions through the exhaust pipe and indirect carbon emissions, which solves the problems of low data accuracy and poor adaptability in the actual measurement method for carbon emission accounting of high-energy-consuming enterprises, effectively improves the accuracy of carbon emission accounting data, realizes the refined accounting of carbon emissions of high-energy-consuming enterprises and accurate quantification of carbon emissions, provides accurate carbon emission data for high-energy-consuming enterprises to implement carbon emission management and participate in carbon market transactions, and provides guidance for high-energy-consuming enterprises to carry out energy conservation and carbon reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a flow chart of the refined accounting method for carbon emissions of high-energy-consuming enterprises. DETAILED DESCRIPTION

[0048] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0049] Example 1

[0050] like Figure 1 A method for calculating carbon emissions from high-energy-consuming enterprises includes the following steps:

[0051] (1) Based on the production process of high-energy-consuming enterprises, sort out the production links within the carbon emission accounting boundary, the flow of CO2 generated in each process during the production process, and the carbon emission area, identify the direct carbon emission sources, unorganized carbon emission sources, and indirect carbon emission sources within the carbon emission area, analyze their carbon emission characteristics, and establish a list of direct carbon emission sources, unorganized carbon emission sources, and indirect carbon emission sources. Among them, direct carbon emission sources include the CO2 generated by the consumption of fluxes such as limestone and dolomite, carbon-containing chemicals such as soda ash and oxalic acid, and purchased carbon-containing raw materials such as electrodes, pig iron, and scrap steel in the production process of high-energy-consuming enterprises, and the CO2 emitted through exhaust pipes in a centralized manner. Specifically, carbon emissions generated during the metal smelting process by high-energy-consuming enterprises, such as steel and nonferrous metals, stem from the addition of limestone, dolomite, carbon-containing chemicals, and other carbon-containing raw materials such as electrodes, pig iron, and scrap steel to smelting furnaces and converters. These emissions, combined with carbon dioxide from fossil fuel combustion, are then collectively discharged through exhaust stacks. The number of exhaust stacks in all production processes of a high-energy-consuming enterprise is denoted as l, where k = 1, 2, …, 1. The first unorganized carbon emission source is the direct CO2 emissions from the consumption of flux, carbon-containing chemicals, and purchased carbon-containing raw materials during the production process of high-energy-consuming enterprises, which are considered unorganized nodal carbon emissions. The second unorganized carbon emission source is the CO2 emissions from unorganized flue gas emissions of high-energy-consuming enterprises. Indirect carbon emission sources are the CO2 emissions generated by the net purchase and use of electricity and heat by high-energy-consuming enterprises.

[0052] (2) Calculate the carbon emissions E from direct carbon emission sources using the actual measurement method 排气筒 : A continuous flue gas emission monitoring system (CEMS) is installed on each exhaust pipe in the production process of high-energy-consuming enterprises. The system consists of an infrared greenhouse gas concentration online monitoring subsystem, a flue gas parameter monitoring subsystem, and a data acquisition and processing subsystem. The infrared greenhouse gas concentration online monitoring subsystem is used to monitor the real-time wet-basis volume concentration of CO2 gas emissions C s , and is used for the CO2 dry basis mass concentration C under standard conditions d The flue gas parameter monitoring subsystem is used to measure the average flow rate of wet flue gas in the cross section. Flue gas temperature t s , Flue gas static pressure (gauge pressure) P s and flue gas moisture content X sw , and is used for the dry flue gas volume flow Q under standard conditions sn Calculation.

[0053] The real-time wet-basis volume concentration C of CO2 gas emitted from the kth exhaust pipe of a high-energy-consuming enterprise sk , average flow rate of wet flue gas Flue gas temperature t sk , Flue gas static pressure P sk and flue gas moisture content Xswk The monitoring data are transmitted from the data collector to the data processing system through the communication system, and the CO2 dry basis mass concentration C under standard conditions is calculated. dk , dry flue gas volume flow Q snk and hourly carbon emissions F 排气筒k .

[0054] The details are as follows:

[0055] S2-1: CO2 dry basis mass concentration of the kth exhaust pipe under standard conditions:

[0056]

[0057] Where: C dk : CO2 dry mass concentration of the kth exhaust pipe under standard conditions, unit: g / m 3 ; C sk : CO2 wet-base volume concentration of the kth exhaust pipe measured by CEMS, unit: volume percentage, %; X swk : Moisture content of flue gas from the kth exhaust chimney.

[0058] S2-2: Dry flue gas volume flow rate Q of the kth exhaust pipe under standard conditions snk Calculation:

[0059]

[0060] Where: Q snk : dry flue gas volume flow rate of the kth exhaust pipe under standard conditions, unit: m 3 / h; A k : The area of ​​the cross section of the kth exhaust pipe, unit: m 2 ;K V : velocity field coefficient; The average flow rate of wet flue gas at the measured section of the kth exhaust stack measured by CEMS, unit: m / s; t sk : The flue gas temperature of the kth exhaust pipe, in °C; P atm : atmospheric pressure, unit: Pa; P sk : Static pressure of flue gas of the kth exhaust chimney (gauge pressure), unit: Pa.

[0061] S2-3: Calculation of hourly carbon emissions of the kth exhaust pipe of a high-energy-consuming enterprise:

[0062] E 排气筒k =C dk ×Q snk ×10 -3 (3);

[0063] Where: E 排气筒k: Hourly carbon emissions of the kth exhaust pipe, unit: kg / h.

[0064] S2-4: Calculation of carbon emissions from all exhaust pipes of high-energy-consuming enterprises:

[0065]

[0066] Where: E 排气筒 : Carbon emissions from all exhaust pipes of high-energy-consuming enterprises. The number of exhaust pipes in all production processes of high-energy-consuming enterprises is marked as l, where the kth exhaust pipe k = 1, 2, ..., l.

[0067] (3) Calculate the carbon emissions E of the first unorganized carbon emission source using the emission factor method 无组织节点 , specifically including:

[0068] S3-1: Calculate carbon emissions based on the actual usage of fluxes such as limestone and dolomite, carbon-containing chemicals such as soda ash and oxalic acid, and purchased carbon-containing raw materials such as electrodes, pig iron, and scrap steel, and the carbon dioxide emission factor. Mark the number of unorganized carbon emission nodes involving the use of fluxes such as limestone and dolomite, carbon-containing chemicals such as soda ash and oxalic acid, and purchased carbon-containing raw materials such as electrodes, pig iron, and scrap steel in the production process of high-energy-consuming enterprises as s, where the tth unorganized carbon emission node t = 1, 2, …, s.

[0069] S3-2: Calculation method for the unorganized carbon emissions of fluxes, carbon-containing chemicals, and carbon-containing raw materials such as electrodes, pig iron, and scrap steel at the tth unorganized carbon emission node of high-energy-consuming enterprises:

[0070] E 无组织节点t =M CDt ×E CDt (5);

[0071] Where: E 无组织节点t : The unorganized carbon emissions of flux, carbon-containing chemicals, and carbon-containing raw materials such as electrodes, pig iron, and scrap steel at the tth unorganized carbon emission node, unit: kgCO2; M CDt : The amount of flux, carbon-containing chemicals, and carbon-containing raw materials such as electrodes, pig iron, and scrap steel used, in tons; E CDt : Carbon dioxide emission factor, the carbon emission coefficient corresponding to flux, carbon-containing chemicals, and carbon-containing raw materials such as electrodes, pig iron, and scrap steel, the unit is: kgCO2 / t raw material.

[0072] S3-3: Calculation method for the total amount of unorganized carbon emissions from fluxes, carbon-containing chemicals, and carbon-containing raw materials such as electrodes, pig iron, and scrap steel at all nodes of high-energy-consuming enterprises:

[0073]

[0074] Where: E 无组织节点 : The total amount of unorganized carbon emissions from fluxes, carbon-containing chemicals, and carbon-containing raw materials such as electrodes, pig iron, and scrap steel at all nodes.

[0075] (4) Calculate the carbon emissions E of the second unorganized carbon emission source using the actual measurement method 无组织源 , specifically including:

[0076] S4-1: Based on the list of unorganized carbon emission sources of high-energy-consuming enterprises, the number of production processes involving fossil fuel combustion that generate unorganized emissions in high-energy-consuming enterprises is recorded as m, where the i-th production process i = 1, 2, ..., m; the number of unorganized emission sources in each production process is recorded as n, and the j-th unorganized emission source in a certain production process is j = 1, 2, ..., n; the carbon emissions of any unorganized emission source in the production process of high-energy-consuming enterprises is recorded as E ij ,

[0077]

[0078] Where: E ij : Carbon emissions from the jth fugitive emission source in production process i of a high-energy-consuming enterprise, unit: kg / h. K ij : Correction coefficient of the jth fugitive emission source in the production process i of a high-energy-consuming enterprise; This embodiment uses the material balance method to calculate the CO2 emissions of the jth fugitive emission source in the production process i of a high-energy-consuming enterprise, recorded as Q ij , Q ij , Effective flue gas emission height H ij , average wind speed Environmental background value of CO2 concentration As well as 5 CO2 concentration values ​​C(20m), C(25m), C(30m), C(35m), C(40m), 5 flue gas horizontal diffusion coefficients σ yij (20m), σ yij (25m), σ yij (30m), σ yij (35m), σ yij (40m) and 5 vertical smoke diffusion coefficients σ zij (20m), σ zij (25m), σ zij (30m), σ zij (35m), σ zij (40m) data are substituted into formula (7) to calculate K ij (20m), K ij (25m), K ij (30m), K ij (35m), Kij (40m), take the arithmetic mean to get the correction coefficient K ij C(x) ij : CO2 ground concentration at a distance of x meters from the jth fugitive emission source in production process i of a high-energy-consuming enterprise along the downwind ground axis, in mg / m 3 , gas chromatography or infrared absorption method is used to test and obtain the CO2 concentration C(x) of the jth unorganized emission source in the production process i of the high-energy-consuming enterprise at a distance of x meters from the emission source along the downwind ground axis. ij data. The environmental background value of CO2 concentration of the jth fugitive emission source in the production process i of a high-energy-consuming enterprise, in mg / m 3 The present invention sets 15 sampling points at 5m, 20m and 50m away from the fugitive emission source within a 60° sector range with the ground axis as the center in the upwind direction of the fugitive emission source. The CO2 concentration of the 15 sampling points is tested by gas chromatography or infrared absorption method respectively, and the arithmetic average is taken to obtain the environmental background value of CO2 concentration. The average wind speed of the environment around the jth fugitive emission source in the production process i of a high-energy-consuming enterprise is measured in m / s. The present invention uses a wind speed measuring instrument to test the wind speed of the environment around the fugitive emission source. The wind speed is read every 2 minutes for 30 minutes. The 15 wind speed values ​​are obtained by the arithmetic average of the 15 wind speed values. σ yij : The horizontal diffusion coefficient of flue gas in the horizontal direction perpendicular to the downwind direction at a distance of x meters from the jth fugitive emission source in the production process i of a high-energy-consuming enterprise, in m. zij : The vertical diffusion coefficient of the flue gas in the vertical direction perpendicular to the downwind direction at a distance of x meters from the j-th unorganized emission source in the production process i of the high-energy-consuming enterprise, in m. In this embodiment, sampling points are set at a distance of 20m, 25m, 30m, 35m and 40m from the emission source along the ground axis in the downwind direction of the unorganized emission source, and the concentration of CO2 at each sampling point is tested by gas chromatography or infrared absorption method, and recorded as C(20m), C(25m), C(30m), C(35m) and C(40m) respectively; at the same time, a three-dimensional ultrasonic anemometer is used to measure the horizontal diffusion coefficient of the flue gas σ yij (20m), σ yij (25m), σ yij (30m), σ yij (35m), σ yij (40m) and smoke vertical diffusion coefficient σ zij (20m), σ zij (25m), σ zij (30m), σ zij (35m), σzij (40m). H ij : The effective emission height of the flue gas from the jth fugitive emission source in the production process i of the high-energy-consuming enterprise, in meters. For the fugitive emissions of high-energy-consuming enterprises, the power and thermal enhancement of the flue gas are ignored. H ij Replaced by the geometric height of the fugitive emission source.

[0079] S4-2: Calculation method for total carbon emissions from unorganized emission sources of high-energy-consuming enterprises:

[0080]

[0081] Where: E 无组织源 : Total carbon emissions from unorganized emission sources of high-energy-consuming enterprises, unit: kg / h; E ij : Carbon emissions from the jth fugitive emission source in production process i of a high-energy-consuming enterprise, unit: kg / h.

[0082] (5) Calculate the carbon emissions E from indirect carbon emission sources using the emission factor method 间接源 , specifically including:

[0083] For carbon dioxide emissions generated by net purchase of electricity and heat, the emission factor method is used to calculate carbon emissions, and the carbon dioxide emissions from indirect carbon emission sources are calculated based on activity data and carbon dioxide emission factors.

[0084] The emission factor method used is the calculation formula for carbon dioxide emissions from indirect carbon emission sources:

[0085] E 间接源 =EE e ×E e +EH h ×E h (9)

[0086] Where: E 间接源 : Indirect carbon emission sources, that is, carbon dioxide emissions generated by net purchased electricity and heat, unit: kgCO2; EE e : Net purchased electricity, unit: MW·h; EH h : Net purchased heat, unit: GJ; E e : Grid emission factor, unit: kgCO2 / MW·h; E h : Thermal emission factor, unit: kgCO2 / GJ.

[0087] (6) Obtain the total carbon emissions of high-energy-consuming enterprises according to steps (2)-(5) E 总 =E 排气筒 +E 无组织节点 +E无组织源 +E 间接源 (10).

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A refined accounting method for carbon emissions of high-energy-consuming enterprises, characterized by: The steps include: (1) Collect data on direct carbon emission sources, first unorganized carbon emission sources, second unorganized carbon emission sources, and indirect carbon emission sources in the production process of high-energy-consuming enterprises; the first unorganized carbon emission source is the CO2 directly emitted in the form of unorganized emissions from the consumption of flux, carbon-containing chemicals, and purchased carbon-containing raw materials in the production process of high-energy-consuming enterprises; the second unorganized carbon emission source is the CO2 emitted by the unorganized flue gas emission sources of high-energy-consuming enterprises; (2) Calculate carbon emissions from direct carbon emission sources using the actual measurement method , specifically including the following steps: S2-1: Collect the real-time wet-based volume concentration of CO2 gas emitted from the exhaust pipes of the production process of high-energy-consuming enterprises , average flow rate of wet flue gas in the cross section , flue gas temperature , Flue gas static pressure and flue gas moisture content ; S2-2: Calculate the CO2 dry mass concentration of the kth exhaust pipe under standard conditions based on the data collected in step S2-1 for: （1）； in, is the CO2 dry mass concentration of the kth exhaust pipe under standard conditions, unit: g / m 3 ; is the CO2 wet-based volume concentration of the kth exhaust pipe, unit: %; is the humidity content of the flue gas from the kth exhaust pipe, unit: %; S2-3: Calculate the dry flue gas volume flow rate of the kth exhaust pipe under standard conditions based on the data collected in step S2-1 for: （2）； in, The area of ​​the cross section of the kth exhaust pipe, unit: m 2 ; is the velocity field coefficient; is the average flow rate of wet flue gas at the measurement section of the kth exhaust chimney, in m / s; is the flue gas temperature of the kth exhaust pipe, in degrees Celsius; is atmospheric pressure, unit: Pa; is the flue gas static pressure of the kth exhaust pipe, in Pa; S2-4: Based on formulas (1) and (2), the carbon emissions of all exhaust pipes of high-energy-consuming enterprises are obtained. : （4）； l is the total number of exhaust pipes; (3) Calculate the carbon emissions of the first unorganized carbon emission source using the emission factor method , specifically including: S3-1: The number of unorganized carbon emission nodes involving the use of flux, carbon-containing chemicals, and purchased carbon-containing raw materials in the production process of high-energy-consuming enterprises is marked as s, where the tth unorganized carbon emission node t=1, 2, …, s; S3-2: Unorganized carbon emissions of flux, carbon-containing chemicals, and purchased carbon-containing raw materials at the tth unorganized carbon emission node for: （5）； in, The usage of flux, carbon-containing chemicals and purchased carbon-containing raw materials, unit: t; is the carbon emission coefficient corresponding to flux, carbon-containing chemicals and purchased carbon-containing raw materials, with the unit being kgCO2 / t flux, carbon-containing chemicals and purchased carbon-containing raw materials; is the unorganized carbon emissions of flux, carbon-containing chemicals and purchased carbon-containing raw materials at the tth unorganized carbon emission node, in kg; S3-3: Therefore, the total unorganized carbon emissions from the use of flux, carbon-containing chemicals, and purchased carbon-containing raw materials at all nodes of high-energy-consuming enterprises for: （6）； (4) Calculate the carbon emissions of the second unorganized carbon emission source using the actual measurement method ; (5) Calculate carbon emissions from indirect carbon emission sources using the emission factor method ; (6) According to steps (2)-(5), the total carbon emissions of high-energy-consuming enterprises are obtained. 。 2. The refined carbon emission accounting method for high-energy-consuming enterprises according to claim 1 is characterized in that: The direct carbon emission sources include CO2 generated by the consumption of flux, carbon-containing chemicals in the production process of high-energy-consuming enterprises, and the CO2 generated by purchased carbon-containing raw materials, which is mixed with CO2 generated by the combustion of fossil fuels and discharged in a centralized manner through exhaust pipes.

3. The refined carbon emission accounting method for high energy-consuming enterprises according to claim 1 is characterized in that: The unorganized carbon emission sources are CO2 emitted from unorganized emission sources of high energy-consuming enterprises.

4. The refined carbon emission accounting method for high energy-consuming enterprises according to claim 1 is characterized in that: The indirect carbon emission source is the CO2 emitted by the net purchase and use of electricity and heat by high-energy-consuming enterprises.

5. The refined carbon emission accounting method for high energy-consuming enterprises according to claim 1 is characterized in that: In step (4), the carbon emissions of the second unorganized carbon emission source The accounting specifically includes: S4-1: The number of production processes of high-energy-consuming enterprises involving fugitive carbon emission sources generated by fossil fuel combustion is recorded as m, where the i-th production process i=1, 2, ..., m; the number of fugitive carbon emission sources in each production process is recorded as n, and the j-th fugitive emission source in a production process is j=1, 2, ..., n; S4-2: The carbon emissions of the jth fugitive emission source in the production process i of a high-energy-consuming enterprise are recorded as E ij , then the total carbon emissions of the second unorganized carbon emission source of high energy-consuming enterprises is for: （8）。 6. The refined accounting method for carbon emissions of high-energy-consuming enterprises as claimed in claim 5 is characterized by: Carbon emissions from the jth fugitive emission source in production process i of the high-energy-consuming enterprise for: （7）； in, is the correction coefficient of the jth fugitive emission source in production process i of a high-energy-consuming enterprise; The CO2 ground concentration at a distance of x meters from the jth fugitive emission source in the production process i of a high-energy-consuming enterprise along the downwind ground axis is expressed in mg / m 3 ; is the environmental background value of CO2 concentration of the jth fugitive emission source in production process i of high energy-consuming enterprises, in mg / m 3 ; is the average wind speed around the jth fugitive emission source in production process i of a high-energy-consuming enterprise, in m / s; is the horizontal diffusion coefficient of flue gas in the horizontal direction perpendicular to the downwind direction at a distance of x meters from the jth fugitive emission source in production process i of a high-energy-consuming enterprise, in m; is the vertical diffusion coefficient of the flue gas in the vertical direction perpendicular to the downwind direction at a distance of x meters from the j-th fugitive emission source in the production process i of the high-energy-consuming enterprise, in m; It is the effective emission height of the flue gas from the jth unorganized emission source in the production process i of the high-energy-consuming enterprise, in meters.

7. The refined carbon emission accounting method for high energy-consuming enterprises according to claim 1 is characterized in that: In step (5), the carbon emissions from indirect carbon emission sources for: （10）； in, Indirect carbon emission sources, that is, carbon dioxide emissions generated by net purchased electricity and heat, unit: kg; The net electricity purchased is in MW•h. Net heat purchase, unit: GJ; is the grid emission factor, unit: kgCO2 / MW•h; is the thermal emission factor, unit: kgCO2 / GJ.

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