Silicon smelting enterprise carbon emission accounting method based on multiple purposes

Abstract

The invention discloses a silicon smelting enterprise carbon emission accounting method based on multiple purposes, and belongs to the technical field of carbon emission accounting. According to the method, a two-dimensional accounting matrix including a production system dimension and an emission link dimension is constructed, and accounting units in the two-dimensional accounting matrix are dynamically activated by designing a unit activation function and a parameter mapping function for different application scenes; constructing a general carbon emission accounting model which is suitable for different scenes and is easy to explain based on the activated two-dimensional accounting matrix; based on the general carbon emission accounting model, designing a carbon emission calculation function in the general accounting model; and constructing an industrial silicon product carbon strength calculation formula in a specific scene. According to the method, the condition that the carbon emission accounting requirements of the silicon smelting enterprise are different under different application scenes such as enterprise carbon transaction, industry carbon management and control and product carbon footprint is fully considered, and a multi-demand response and flexible and adaptive carbon emission accounting technical system is formed by constructing the modular accounting unit and the configurable matrix model.

Description

Technical Field

[0001] This invention relates to the field of carbon emission accounting technology, and in particular to a carbon emission accounting method for multi-purpose silicon smelting enterprises. Background Technology

[0002] Accurate carbon emission accounting is the foundation for silicon smelting enterprises to formulate carbon emission reduction strategies, implement energy conservation and carbon reduction measures, and participate in carbon emission trading. Currently, silicon smelting enterprises generally use two methods for carbon emission accounting: emission factor method and material balance method (mass balance method).

[0003] However, existing carbon emission accounting methods for silicon smelting reveal inherent technical flaws when adapting to the national dual-control system for carbon emissions, encompassing enterprise carbon trading, industry carbon management, and product carbon footprint. On one hand, existing methods are mostly applicable to carbon emission accounting for silicon smelting enterprises within a fixed scenario. The accounting boundaries, scope, and emission factor selection rules are rigid, resulting in a lack of necessary technical flexibility and adaptability when facing differentiated accounting needs across various application scenarios, such as enterprise carbon trading (focusing on direct emissions from production facilities), industry carbon management (focusing on the entire production system), and product carbon footprint (covering the entire life cycle). On the other hand, the different carbon emission accounting requirements in different application scenarios force enterprises to perform repetitive but differently regulated data processing for the same emission source, significantly reducing the efficiency and accuracy of carbon emission accounting. Therefore, for silicon smelting enterprises, it is necessary to provide a carbon emission accounting method with inherent technical flexibility, clear accounting logic, and easily interpretable results to address the aforementioned technical problems. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a carbon emission accounting method for multi-purpose silicon smelting enterprises.

[0005] To achieve the above technical solution, the specific steps are as follows: S1. Construct a modular accounting unit library: build a two-dimensional accounting matrix consisting of production system dimension and emission link dimension to clarify the complete boundary of carbon emission accounting; The production system dimension divides industrial silicon production activities into three stages, including: Core production link A1 refers to the smelting process in silicon smelting; Other production stages A2 refer to production processes other than smelting, such as refining, casting, crushing and screening in silicon smelting. Auxiliary and ancillary links A3 refer to auxiliary activities such as raw material preparation, transportation, casting, finishing, environmental protection facilities, and industrial silicon transportation, as well as ancillary activities such as raw material inspection, testing, truck transportation, maintenance, factory canteen, and administrative management. The emission source dimension categorizes carbon emission sources into three types, including: Fossil fuel combustion emissions B1 refer to CO2 emissions generated by the oxidation and combustion of fossil fuels such as coal, oil, and natural gas in stationary or mobile facilities; Process emissions B2 refer to CO2 emissions caused by physical or chemical changes other than fuel combustion during production, waste treatment and disposal, etc. Electricity / heat consumption emissions B3 refer to CO2 emissions generated corresponding to net electricity and heat consumption; The method for constructing a two-dimensional accounting matrix is ​​as follows: By using the production system dimension as columns and the emission stage dimension as rows, a 3×3 basic accounting matrix is ​​constructed, as shown in Table 1; each cell in the matrix is ​​a preset accounting unit. u (), representing emissions from a specific stage in a production system.

[0006] Table 1: Two-dimensional accounting matrix for carbon emissions from silicon smelting S2. Establish scenario-based configuration rules: Dynamically activate the accounting units in the two-dimensional accounting matrix by designing unit activation functions and parameter mapping functions for different application scenarios; Unit activation function M( s,u ): The design unit activation function is a binary function, M( s,u )∈{0, 1}, used to determine in a specific scenario s Below, preset accounting units u Whether it is included in the final calculation; the activation function of this unit is equivalent to "pruning" the basic calculation matrix, retaining only the units that are relevant to the scene; Parameter mapping function P( s,u ): Parameter mapping functions are used for specific scenarios s Preset accounting unit below u Specify key calculation parameters; typically, specify the corresponding carbon emission factor for electricity consumption emission unit B3; The above rules are implemented through a predefined configuration matrix, as shown in Table 2; Table 2: Configuration Matrix of Typical Scenarios for Carbon Emission Accounting in Silicon Smelting Based on the configuration matrix and according to the silicon smelting production process, the CO2 generated in each process and link of the production process within the carbon emission accounting boundary is sorted out, the direct carbon emission sources and indirect carbon emission sources within the carbon emission range are identified, and their carbon emission characteristics are analyzed. Based on the accounting matrix constructed in step one (Table 1), an accounting unit library containing production system dimension and emission link dimension is established, as shown in Table 3. Table 3: Carbon Emission Accounting Unit Library for Silicon Smelting S3. Construct a general carbon emission accounting model: Based on the activated accounting units and specified parameters, construct a general carbon emission accounting model that is applicable to different scenarios and easy to interpret, as shown in the following expression: In the formula, Represents a specific scenario s The carbon emissions are expressed in tons of carbon dioxide (tCO2). Indicates the preset accounting unit; This represents the complete set of accounting units in the accounting unit library; Indicates the cell activation function; Indicates the preset accounting unit The corresponding dedicated carbon emission calculation function; Indicates the preset accounting unit Activity level data (such as fuel consumption, electricity consumption, etc.); This represents a parameter mapping function.

[0007] S4. Determine the unit emission calculation function: Based on the general carbon emission accounting model, design the carbon emission calculation function in the general accounting model; In the general carbon emission accounting model, the calculation function for type B of the same type of emission stage is universal, but its activity level data... Originating from different production systems A; among them, ; ; The carbon emission calculation functions in the design of the general accounting model include: Fossil fuel combustion emission units ( () (B1 represents condition A), the calculation function is: In the formula, Indicating the combustion of fossil fuels Emissions, in tons of carbon dioxide (CCO2) ); Indicates the first The consumption of various fossil fuels, expressed in tons (t). Indicates the first The lower heating value of fossil fuels, for solid and liquid fossil fuels, is expressed in gigajoules per ton (GJ / t), and for gaseous fossil fuels, in gigajoules per 10,000 standard cubic meters (SQCs). ); Indicates the first The carbon content per unit calorific value of a fossil fuel, expressed in tons of carbon per gigajoules (tC / GJ). Indicates the first Carbon oxidation rate of fossil fuels, in % express and The ratio of their relative molecular masses is dimensionless. Process emission unit ( The calculation formula is: In the formula, Indicates the products generated during the production process Emissions, in tons of carbon dioxide (CCO2) ); Indicates the first The consumption of various carbon-containing reducing agents (commonly used reducing agents include petroleum coke, washed coke, semi-coke, etc.), electrodes, carbonates, urea, and other carbon-containing raw materials, in tons. ; Indicates the first Carbon emission factors of various carbon-containing raw materials such as carbon-containing reducing agents, electrodes, carbonates, and urea, expressed in tons of carbon dioxide per ton (t). ); Electricity / heat consumption emission unit ( The calculation formula is: In the formula, This indicates the net consumption of electricity and heat. Emissions, in tons of carbon dioxide (CCO2) ); This indicates net consumption of electricity or heat; for electricity consumption, the unit is megawatt-hours (MWh); for heat consumption, the unit is gigajoules (GJ). This indicates the carbon emission factor for electricity or heat consumption. For electricity emission factors, the unit is tons of carbon dioxide per megawatt-hour (MWH). For thermal emission factors, the unit is tons of carbon dioxide per gigajoule (TCO). ).

[0008] S5. Calculate the carbon intensity of the product: Construct a formula for calculating the carbon intensity of industrial silicon products under a specific scenario, as shown in the following expression: In the formula, This indicates the carbon emission intensity of industrial silicon products during the accounting period, expressed in tons of carbon dioxide per ton (t). ); Indicates carbon emissions in a specific scenario; This indicates the total output of industrial products within the accounting period, expressed in tons (t).

[0009] Beneficial effects of the present invention This invention fully considers the different carbon emission accounting needs of silicon smelting enterprises under various application scenarios such as corporate carbon trading, industry carbon management, and product carbon footprint. By constructing modular accounting units and configurable matrix models, it forms a carbon emission accounting technology system that responds to multiple needs and is flexibly adaptable. It solves the problems of low accounting efficiency and insufficient accuracy caused by the rigid technical architecture of existing accounting methods. It realizes that a set of basic data and a core model can dynamically generate accurate accounting results that are adapted to multiple application scenarios. Moreover, the accounting process and results are interpretable. It provides accurate carbon emission data for silicon smelting enterprises to formulate carbon emission reduction strategies and participate in carbon emission trading, and provides guidance for silicon smelting enterprises to implement energy-saving and carbon-reduction measures. Attached Figure Description

[0010] Picture 1 This is a flowchart of a multi-purpose carbon emission accounting method for the silicon smelting industry; Picture 2 This is a schematic diagram of the carbon emission accounting boundary for silicon smelting enterprises. Detailed Implementation

[0011] The present invention will be further described in detail below with reference to specific embodiments.

[0012] Example 1 See Picture 1 and Picture 2 A carbon emission accounting method for multi-purpose silicon smelting enterprises includes the following steps: S1. Construct a modular accounting unit library: build a two-dimensional accounting matrix consisting of production system dimension and emission link dimension to clarify the complete boundary of carbon emission accounting; The production system dimension divides industrial silicon production activities into three stages, including: Core production link A1 refers to the smelting process in silicon smelting; Other production stages A2 refer to production processes other than smelting, such as refining, casting, crushing and screening in silicon smelting. Auxiliary and ancillary links A3 refer to auxiliary activities such as raw material preparation, transportation, casting, finishing, environmental protection facilities, and industrial silicon transportation, as well as ancillary activities such as raw material inspection, testing, truck transportation, maintenance, factory canteen, and administrative management. The emission source dimension categorizes carbon emission sources into three types, including: Fossil fuel combustion emissions B1 refer to CO2 emissions generated by the oxidation and combustion of fossil fuels such as coal, oil, and natural gas in stationary or mobile facilities; Process emissions B2 refer to CO2 emissions caused by physical or chemical changes other than fuel combustion during production, waste treatment and disposal, etc. Electricity / heat consumption emissions B3 refer to CO2 emissions generated corresponding to net electricity and heat consumption; The method for constructing a two-dimensional accounting matrix is ​​as follows: By using the production system dimension as columns and the emission stage dimension as rows, a 3×3 basic accounting matrix is ​​constructed, as shown in Table 1; each cell in the matrix is ​​a preset accounting unit. u (), representing emissions from a specific stage in a production system.

[0013] Table 1: Two-dimensional accounting matrix for carbon emissions from silicon smelting S2. Establish scenario-based configuration rules: Dynamically activate the accounting units in the two-dimensional accounting matrix by designing unit activation functions and parameter mapping functions for different application scenarios; Unit activation function M( s,u ): The design unit activation function is a binary function, M( s,u )∈{0, 1}, used to determine in a specific scenario s Below, preset accounting units u Whether it is included in the final calculation; the activation function of this unit is equivalent to "pruning" the basic calculation matrix, retaining only the units that are relevant to the scene; Parameter mapping function P( s,u ): Parameter mapping functions are used for specific scenarios s Preset accounting unit below u Specify key calculation parameters; typically, specify the corresponding carbon emission factor for electricity consumption emission unit B3; The above rules are implemented through a predefined configuration matrix, as shown in Table 2; Table 2: Configuration Matrix of Typical Scenarios for Carbon Emission Accounting in Silicon Smelting Based on the configuration matrix and according to the silicon smelting production process, the CO2 generated in each process and link of the production process within the carbon emission accounting boundary is sorted out, the direct carbon emission sources and indirect carbon emission sources within the carbon emission range are identified, and their carbon emission characteristics are analyzed. Based on the accounting matrix constructed in step one (Table 1), an accounting unit library containing production system dimension and emission link dimension is established, as shown in Table 3. Table 3: Carbon Emission Accounting Unit Library for Silicon Smelting S3. Construct a general carbon emission accounting model: Based on the activated accounting units and specified parameters, construct a general carbon emission accounting model that is applicable to different scenarios and easy to interpret, as shown in the following expression: In the formula, Represents a specific scenario s The carbon emissions are expressed in tons of carbon dioxide (CCO2). ); Indicates the preset accounting unit; This represents the complete set of accounting units in the accounting unit library; Indicates the cell activation function; Indicates the preset accounting unit The corresponding dedicated carbon emission calculation function; Indicates the preset accounting unit Activity level data (such as fuel consumption, electricity consumption, etc.); This represents a parameter mapping function.

[0014] S4. Determine the unit emission calculation function: Based on the general carbon emission accounting model, design the carbon emission calculation function in the general accounting model; In the general carbon emission accounting model, the calculation function for type B of the same type of emission stage is universal, but its activity level data... Originating from different production systems A; among them, ; ; The carbon emission calculation functions in the design of the general accounting model include: Fossil fuel combustion emission units ( () (B1 represents condition A), the calculation function is: In the formula, Indicating the combustion of fossil fuels Emissions, in tons of carbon dioxide (CCO2) ); Indicates the first The consumption of various fossil fuels, expressed in tons (t). Indicates the first The lower heating value of fossil fuels, for solid and liquid fossil fuels, is expressed in gigajoules per ton (GJ / t), and for gaseous fossil fuels, in gigajoules per 10,000 standard cubic meters (SQCs). ); Indicates the first The carbon content per unit calorific value of a fossil fuel, expressed in tons of carbon per gigajoules (tC / GJ). Indicates the first Carbon oxidation rate of fossil fuels, in % express and The ratio of their relative molecular masses is dimensionless. Process emission unit ( The calculation formula is: In the formula, Indicates the products generated during the production process Emissions, in tons of carbon dioxide (CCO2) ); Indicates the first The consumption of various carbon-containing reducing agents (commonly used reducing agents include petroleum coke, washed coke, semi-coke, etc.), electrodes, carbonates, urea, and other carbon-containing raw materials, in tons. ; Indicates the first Carbon emission factors of various carbon-containing raw materials such as carbon-containing reducing agents, electrodes, carbonates, and urea, expressed in tons of carbon dioxide per ton (t). ); Electricity / heat consumption emission unit ( The calculation formula is: In the formula, This indicates the net consumption of electricity and heat. Emissions, in tons of carbon dioxide (CCO2) ); This indicates net consumption of electricity or heat; for electricity consumption, the unit is megawatt-hours (MWh); for heat consumption, the unit is gigajoules (GJ). This indicates the carbon emission factor for electricity or heat consumption. For electricity emission factors, the unit is tons of carbon dioxide per megawatt-hour (MWH). For thermal emission factors, the unit is tons of carbon dioxide per gigajoule (TCO). ).

[0015] S5. Calculate the carbon intensity of the product: Construct a formula for calculating the carbon intensity of industrial silicon products under a specific scenario, as shown in the following expression: In the formula, This indicates the carbon emission intensity of industrial silicon products during the accounting period, expressed in tons of carbon dioxide per ton (t). ); Indicates carbon emissions in a specific scenario; This indicates the total output of industrial products within the accounting period, expressed in tons (t).

[0016] Example 2 Taking a silicon smelting company 1 as an example, the method of Example 1 is used to calculate the company 1's annual total carbon emissions and carbon emissions per unit product under the corporate carbon trading scenario (s = corporate carbon trading).

[0017] According to the configuration rules (Table 2), in the enterprise carbon trading scenario (s = enterprise carbon trading), only direct carbon emissions from core production processes are included in the accounting; in this scenario, activation... u1, u2 Accounting unit; that is, for u1, u2, M(s,u)=1 ;for u3、 u4, u5, u6, u7, u8, u9, M(s,u)=0 .

[0018] In the context of corporate carbon trading, the parameter mapping function P(s, u) is selected as follows: the lower heating value, carbon content per unit calorific value, and carbon oxidation rate of fossil fuels such as diesel and gasoline are selected from data in GB32151.41; the carbon emission factors of carbon-containing reducing agents such as petroleum coke, washed coke, semi-coke, and charcoal, as well as other carbon-containing raw materials such as electrodes and carbonates, are selected from data in GB32151.41; the carbon emission factor of heat is selected from data in GB32151.41; and the carbon emission factor of electricity is selected from the carbon emission factor data of electricity released by the Ministry of Ecology and Environment. In this example, considering that corporate carbon trading is a nationwide market transaction, the national average carbon emission factor data of electricity is selected.

[0019] Then we have: ; Based on the actual annual material and energy consumption data of Company 1, There is no consumption of fossil fuels for combustion, therefore ; Based on S3 and S4, the total annual carbon emissions of Company 1 under the corporate carbon trading scenario are obtained. ; In the formula: AD 石油焦 AD 半焦 AD 洗精煤 AD 电极 These represent the annual consumption of petroleum coke, semi-coke, washed coking coal, and electrodes for Company 1, in tons (t); EF 石油焦 EF 半焦 EF 洗精煤 EF 电极 The carbon emission factors for petroleum coke, semi-coke, washed coal, and electrodes are respectively, in units of... ; Based on the actual annual material and energy consumption of Enterprise 1 and the parameters selected above, the carbon emissions from silicon smelting under the enterprise carbon trading scenario are calculated as shown in Table 4. Table 4: Annual Carbon Emissions of Silicon Smelting Enterprises under Enterprise Carbon Trading Scenarios Carbon emissions per unit of industrial silicon product of Company 1 under corporate carbon trading scenario .

[0020] Calculations show that Company 1's annual industrial silicon production is 91,600 tons, and the carbon emissions per unit of industrial silicon product can be calculated to be 2.99 tons. .

[0021] Example 3 This embodiment takes a silicon smelting company 1 as an example and uses the method of embodiment 1 to calculate the company 1's annual total carbon emissions and carbon emissions per unit product under the industry carbon control scenario (s=industry carbon control).

[0022] According to the configuration rules (Table 2), under the industry carbon control scenario (s = industry carbon control), direct and indirect carbon emissions from core production processes and other production processes are included in the accounting. In this scenario, activation... u1 to u6 Accounting unit. That is, for u1、 u2, u3, u4, u5, u6, M ( s, u ) =1 ;for u7, u8, u9, M ( s, u ) =0 .

[0023] In the context of industry carbon control, the parameter mapping function P(s, u) is selected as follows: the lower heating value, carbon content per unit calorific value, and carbon oxidation rate of fossil fuels such as diesel and gasoline are selected from data in GB32151.41; the carbon emission factors of carbon-containing reducing agents such as petroleum coke, washed coke, semi-coke, semi-coke, and charcoal, as well as other carbon-containing raw materials such as electrodes and carbonates, are selected from data in GB32151.41; the thermal carbon emission factor is selected from data in GB32151.41; and the electricity carbon emission factor is selected from the electricity carbon emission factor data released by the Ministry of Ecology and Environment. In this example, since industry carbon control is a national-level carbon management, the national average electricity carbon emission factor data is selected.

[0024] Then we have: ; Based on the company's actual annual material and energy consumption data, No fossil fuels are consumed in the combustion process. No fossil fuels are consumed in the combustion process. There is no consumption of carbon-containing raw materials, therefore =0 , =0 , =0 ; In the formula: AD石油焦 AD 半焦 AD 洗精煤 AD 电极 These represent the annual consumption of petroleum coke, semi-coke, washed coking coal, and electrodes for Company 1, in tons (t); EF 石油焦 EF 半焦 EF 洗精煤 EF 电极 The carbon emission factors for petroleum coke, semi-coke, washed coal, and electrodes are respectively, in units of... ; In the formula: The annual electricity consumption of the smelting process in Enterprise 1 is expressed in MWh. The carbon emission factor for electricity consumption, in units of In this scenario, the factors selected are the national average electricity carbon emission factor data released by the Ministry of Ecology and Environment; In the formula: The annual electricity consumption of Enterprise 1 for its production processes other than smelting, such as refining, casting, crushing and screening, is expressed in MWh. The carbon emission factor for electricity consumption, in units of In this scenario, the factors selected are the national average electricity carbon emission factor data released by the Ministry of Ecology and Environment; Based on the actual annual material and energy consumption of Enterprise 1 and the parameters selected above, the carbon emissions from silicon smelting under the enterprise's carbon trading scenario are calculated as shown in Table 5.

[0025] Table 5: Total Annual Carbon Emissions of Silicon Smelting Enterprises under Industry Carbon Control Scenario Carbon emissions per unit of industrial silicon product for Company 1 under industry carbon control scenarios .

[0026] According to calculations, Company 1's annual industrial silicon output is 91,600 tons, and the carbon emission per unit of industrial silicon product is 10.49 tons. .

[0027] Example 4 This embodiment takes a silicon smelting company 1 as an example and uses the method of embodiment 1 to calculate the company 1's total annual carbon emissions and carbon emissions per unit product under the product carbon footprint scenario (s = product carbon footprint). According to the configuration rules (Table 2), in the product carbon footprint scenario (s = product carbon footprint), all direct and indirect carbon emissions related to product production are included in the accounting. In this scenario, accounting units u1 to u9 are activated, that is, for u1, u2, u3, u4, u5, u6, u7, u8, u9, M(s, u) = 1; In the product carbon footprint scenario, the parameter mapping function P(s, u) is selected as follows: the lower heating value, carbon content per unit calorific value, and carbon oxidation rate of fossil fuels such as diesel and gasoline are selected from data in GB32151.41; the carbon emission factors of carbon-containing reducing agents such as petroleum coke, washed coke, semi-coke, semi-coke, and charcoal, as well as other carbon-containing raw materials such as electrodes and carbonates, are selected from data in GB32151.41; the thermal carbon emission factor is selected from data in GB32151.41; and the electricity carbon emission factor is selected from the electricity carbon footprint factor data released by the Ministry of Ecology and Environment. In this example, since all the electricity consumed by Enterprise 1 is hydropower, the electricity carbon footprint factor data of hydropower generation is selected. Then we have: ; Based on the company's actual annual material and energy consumption data, No fossil fuels are consumed in the combustion process. No fossil fuels are consumed in the combustion process. There is no consumption of carbon-containing raw materials, therefore =0 , =0 , =0 ; In the formula: AD 石油焦 AD 半焦 AD 洗精煤 AD 电极 These represent the annual consumption of petroleum coke, semi-coke, washed coking coal, and electrodes for Company 1, in tons (t); EF 石油焦 EF 半焦 EF 洗精煤 EF 电极 The carbon emission factors for petroleum coke, semi-coke, washed coal, and electrodes are respectively, in units of... ; In the formula: The annual electricity consumption of the smelting process in Enterprise 1 is expressed in MWh. The carbon emission factor for electricity consumption, in units of In this scenario, the factors selected are the electricity carbon footprint factor data of hydropower generation released by the Ministry of Ecology and Environment; In the formula: The annual electricity consumption of Enterprise 1 for its production processes other than smelting, such as refining, casting, crushing and screening, is expressed in MWh. The carbon emission factor for electricity consumption, in units of In this scenario, the factors selected are the electricity carbon footprint factor data of hydropower generation released by the Ministry of Ecology and Environment; In the formula: AD 柴油 AD 汽油 NCV represents the annual consumption of diesel and gasoline for auxiliary activities of Enterprise 1, in tons. 柴油 NCV 汽油 Lower heating value of diesel and gasoline, expressed in GJ / t; CC 柴油 CC 汽油 This refers to the carbon content per unit calorific value of diesel and gasoline, expressed in tC / GJ; OF diesel, OF 汽油 The carbon oxidation rate of diesel and gasoline is expressed as %; 44 / 12 represents... The ratio to the relative molecular mass of C is dimensionless; In the formula: The annual consumption of calcium carbonate in the auxiliary activities of Enterprise 1 is expressed in tons. The carbon emission factor of calcium carbonate, in units of ; In the formula: The annual electricity consumption of enterprise 1's auxiliary and ancillary links, in MWh; The carbon emission factor for electricity consumption, in units of In this scenario, the factors selected are the electricity carbon footprint factor data of hydropower generation released by the Ministry of Ecology and Environment; Based on the actual annual material and energy consumption of Enterprise 1 and the parameters selected above, the carbon emissions of silicon smelting under the enterprise carbon trading scenario are calculated as shown in Table 6. Table 6: Total Annual Carbon Emissions of Silicon Smelting Enterprises under Product Carbon Footprint Scenario Carbon emissions per unit of industrial silicon product for Company 1 under the product carbon footprint scenario .

[0028] According to calculations, Company 1's annual industrial silicon output is 91,600 tons, and the carbon emissions per unit of industrial silicon product are 3.49 tons. .

[0029] It should be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A method for accounting carbon emissions based on a multi-purpose silicon smelting enterprise, characterized in that, Comprise the following steps: S1, the modular accounting unit library is established: a two-dimensional accounting matrix composed of production system dimensions and emission link dimensions is constructed to clearly define the complete boundary of carbon emission accounting; The production system dimensions include: core production link A1, other production link A2, auxiliary auxiliary link A3; The emission link dimensions include: fossil fuel combustion emission B1, process emission B2, power / heat consumption emission B3; The construction method of the two-dimensional accounting matrix is: taking the production system dimension as the column and the emission link dimension as the row, a 3*3 basic accounting matrix is constructed; S2, establish a scenario configuration rule: for different application scenarios, activate the accounting units in the two-dimensional accounting matrix by designing unit activation functions and parameter mapping functions; S3, construct a general carbon emission accounting model: based on the activated accounting units, a general carbon emission accounting model suitable for different scenarios and easy to explain is constructed; S4, determine the unit emission calculation function: based on the general carbon emission accounting model, design the carbon emission calculation function in the general carbon emission accounting model; S5, calculate the carbon intensity of the product: construct the calculation formula of the carbon intensity of the industrial silicon product in the specific scene, and complete the construction of the accounting method.

2. The method for accounting carbon emissions of a multipurpose silicon smelting enterprise according to claim 1, characterized in that: The unit activation function is a binary function for determining whether a specific scene s The preset accounting unit u is included in the final accounting. The parameter mapping function is used to specify key calculation parameters for a specific scenario s under a preset accounting unit u ​ 3. The method for accounting carbon emissions of a multipurpose silicon smelting enterprise according to claim 2, characterized in that: The preset accounting unit u comprises a first preset accounting unit to a ninth preset accounting unit, ; wherein 、 、 、 、 、 、 、 and ; A1 is the core production link, A2 is the other production link, and A3 is the auxiliary auxiliary link; B1 is the fossil fuel combustion emission, B2 is the process emission, and B3 is the power / heat consumption emission.

4. The method for accounting carbon emissions of a multipurpose silicon smelting enterprise according to claim 1, characterized in that: The general carbon emission accounting model has the following expression: In the formula, represents the carbon emissions under a specific scenario, in tons of carbon dioxide; s represents a preset accounting unit; represents a complete set of accounting units in the accounting unit library; represents a unit activation function, which is a binary function, indicating 1 when activated and 0 when not activated; represents a preset accounting unit corresponding to a dedicated carbon emission calculation function; represents the activity level data of a preset accounting unit represents a parameter mapping function.​​ 5. The method for accounting carbon emissions of a multipurpose silicon smelting enterprise according to claim 4, characterized in that: The preset accounting unit in the carbon emission calculation function in the design universal carbon emission accounting model The corresponding exclusive carbon emission calculation function comprises: Fossil fuel combustion emission unit, comprising: , and ; The calculation formula is: wherein, represents the amount of emissions from fossil fuel combustion ; represents the amount of consumption of the th fossil fuel; represents the low calorific value of the th fossil fuel, in units of gigajoules per ton for solid and liquid fossil fuels, and in units of gigajoules per 10,000 standard cubic meters for gaseous fossil fuels; represents the carbon content per unit heat value of the th fossil fuel, in units of tons of carbon per gigajoule; represents the carbon oxidation rate of the th fossil fuel, in units of %; represents the ratio of the relative molecular mass of the to the relative molecular mass of the , dimensionless; A process exhaust unit, comprising: , and ; The calculation formula is: wherein represents the amount of carbon dioxide emitted during the production process; emissions, in tons of carbon dioxide; represents the amount of carbon dioxide emitted during the production process; consumption of the first carbon-containing reducing agent, the electrode, the carbonate salt, and the urea, in tons ; represents the amount of carbon dioxide emitted during the production process; carbon emission factor of the first carbon-containing reducing agent, the electrode, the carbonate salt, and the urea, in tons of carbon dioxide per ton; A power / heat consumption discharging unit, comprising: , and ; The calculation formula is: In the formula, represents the net consumption of electric power, heat generated by emissions, in tons of carbon dioxide; represents the net consumption of electric power or heat; for the amount of electric power consumption, the unit is megawatt-hour; for the amount of heat consumption, the unit is gigajoule; represents the carbon emission factor of the consumption of electric power or heat, for the electric power emission factor, the unit is tons of carbon dioxide per megawatt-hour, and for the heat emission factor, the unit is tons of carbon dioxide per gigajoule.

6. The method for accounting carbon emissions of a multipurpose silicon smelting enterprise according to claim 1, characterized in that: The calculation formula of the carbon intensity of the industrial silicon product in the specific scene has the following expression: In the formula, represents the carbon emission intensity of the industrial silicon product in the accounting period, with the unit of tons of carbon dioxide per ton; represents the carbon emission amount under a specific scenario; represents the total output of the industrial product in the accounting period, with the unit of tons.

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