Industrial park carbon emission dynamic accounting method and system

Abstract

The invention discloses an industrial park carbon emission dynamic accounting method and system, and belongs to the field of carbon emission accounting. The method comprises the steps that dynamic carbon emission results of industrial park fossil fuel combustion, the industrial process, waste treatment, electricity utilization and heat utilization are obtained in real time, specifically, the dynamic carbon emission results of industrial park fossil fuel combustion are obtained according to the consumption of each fuel and corresponding carbon emission factors; according to the industrial process activity level data and the corresponding production process carbon emission factors, a dynamic carbon emission result of industrial park fossil fuel combustion is obtained; calculating a dynamic carbon emission result of waste treatment according to the amount of solid waste and sewage generated at each moment in the industrial park; calculating a dynamic carbon emission result of power utilization of the industrial park according to the comprehensive power utilization carbon emission factor; and calculating a dynamic carbon emission result of heat consumption of the industrial park according to the comprehensive heat consumption carbon emission factor. According to the invention, the carbon emission results of different carbon emission sources at different moments in the industrial park can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission accounting, and more specifically to a method and system for dynamic carbon emission accounting in an industrial park. Background Art

[0002] For industrial parks, whether the calculation method of carbon emissions is reasonable and the values ​​are accurate are of great significance for accurately assessing the carbon emissions of the park and formulating reasonable and feasible carbon peak and carbon neutrality implementation paths.

[0003] At present, industrial parks are home to many enterprises with different characteristics. Traditional accounting methods only focus on the total annual carbon emissions of each enterprise in the park, lacking real-time calculation of carbon emissions and analysis of carbon emission characteristics. Macroeconomic measurement of carbon emissions can no longer meet the needs of in-depth research on carbon emissions in industrial parks, and dynamic accounting of carbon emissions in industrial parks urgently needs in-depth research. Summary of the invention

[0004] In view of this, the present invention provides a method and system for dynamic accounting of carbon emissions in an industrial park, which are used to at least solve some of the technical problems in the background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention discloses a method for dynamic carbon emission accounting in an industrial park, comprising:

[0007] Implement the acquisition of dynamic carbon emission results for five parts of industrial parks: fossil fuel combustion, industrial processes, waste treatment, electricity and heat use;

[0008] The dynamic carbon emission results of fossil fuel combustion are obtained by the following steps:

[0009] Obtain the consumption of each fuel consumed by the industrial park and the corresponding carbon emission factor in real time, and obtain the dynamic carbon emission results of fossil fuel combustion in the industrial park based on the consumption of each fuel and the corresponding carbon emission factor;

[0010] The dynamic carbon emission results of the industrial process are obtained by the following steps:

[0011] Obtaining in real time the industrial process activity level data and the corresponding production process carbon emission factors of each product produced in the industrial park at each moment, and obtaining the dynamic carbon emission results of fossil fuel combustion in the industrial park based on the industrial process activity level data and the corresponding production process carbon emission factors;

[0012] The dynamic carbon emission results of the waste treatment are obtained by the following steps:

[0013] Calculate the dynamic carbon emissions of solid waste based on the amount of solid waste generated by the industrial park at each moment and the corresponding carbon emission factor;

[0014] Calculate the dynamic carbon emissions of CH4 and N2O produced during sewage treatment based on the sewage generated at each moment in the industrial park;

[0015] The dynamic carbon emission of the solid waste, as well as the dynamic carbon emission of CH4 and N2O are taken together as the dynamic carbon emission result of waste treatment;

[0016] The dynamic carbon emission results of electricity consumption are obtained through the following steps:

[0017] Obtain the exogenous electricity carbon emission factor and endogenous electricity carbon emission factor of the industrial park respectively, and obtain the comprehensive electricity carbon emission factor;

[0018] Calculate the dynamic carbon emission results of electricity consumption in the industrial park based on the comprehensive electricity carbon emission factor;

[0019] The thermal carbon emission record is obtained by the following steps:

[0020] Obtain the exogenous heat carbon emission factor and endogenous heat carbon emission factor of the industrial park respectively, and obtain the comprehensive heat carbon emission factor;

[0021] The dynamic carbon emission results of heat use in the industrial park are calculated based on the comprehensive heat carbon emission factor.

[0022] Furthermore, according to the consumption of each fuel and the corresponding carbon emission factor, the dynamic carbon emission results of fossil fuel combustion in the industrial park are obtained, which is achieved through the following formula:

[0023]

[0024] F i,t =NCV i FC i,t ;

[0025] e f,i =CC i ·OF i β;

[0026] In the formula, C f,t represents the carbon dioxide emissions from fuel combustion in the industrial park at time t; F i,t represents the amount of the i-th fuel consumed by the industrial park at time t; e f,i NCV represents the carbon dioxide emission factor of the i-th fuel; i Indicates the net calorific value of the i-th fuel; FC i,t represents the consumption of the i-th fuel at time t; CC iIndicates the carbon content of the unit calorific value of the i-th fuel; OF i represents the carbon oxidation rate of the i-th fuel; β represents the CO2 gasification coefficient.

[0027] Furthermore, when the i-th fuel consumed by the industrial park is raw coal, the carbon oxidation rate is obtained by the following formula:

[0028]

[0029] In the formula, OF c Indicates the carbon oxidation rate of coal; G z Indicates the output of slag; C z Indicates the average carbon content of the slag; G h Indicates the yield of fly ash; C h Indicates the average carbon content of fly ash; η cc Indicates the average dust removal efficiency of the dust removal system; FC c Indicates coal consumption; NCV c Indicates the average lower calorific value of coal; CC c Indicates the carbon content per unit calorific value of coal.

[0030] Furthermore, the dynamic carbon emission results of fossil fuel combustion in the industrial park are obtained according to the industrial process activity level data and the corresponding production process carbon emission factors, which are achieved by the following formula:

[0031]

[0032] In the formula, C p,t represents the carbon emissions generated by the industrial production process in the industrial park at time t; P i,t represents the process activity level data when the industrial park produces the i-th product at time t; e p,i,t It represents the carbon emission factor of the production process when the industrial park produces the i-th product at time t.

[0033] Furthermore, the dynamic carbon emissions of solid waste are calculated based on the amount of solid waste generated at each moment in the industrial park and the corresponding carbon emission factor, which is achieved through the following formula:

[0034] E S,t =AD S,t ·EF S ;

[0035] EF s =CCW i FCF i β;

[0036] In the formula, E S,t represents the carbon emissions generated by solid waste incineration in the industrial park at time t; AD S,trepresents the amount of solid waste generated by the industrial park at time t; EF S Indicates the corresponding carbon emission factor; CCW i Indicates the carbon content ratio of the i-th type of solid waste; FCF i Represents the proportion of mineral carbon in the i-th category of solid waste.

[0037] Furthermore, the dynamic carbon emissions of CH4 and N2O generated during sewage treatment are calculated based on the sewage generated at each moment in the industrial park, which is achieved through the following formula:

[0038]

[0039] Where W t It indicates the total amount of degradable organic matter that is removed and settled in the form of sludge; represents the emission factor of CH4; Indicates the amount of CH4 recycled; TN t Indicates the nitrogen content of sewage; represents the emission factor of N2O.

[0040] Furthermore, the comprehensive electricity carbon emission factor is obtained by the following formula:

[0041]

[0042] In the formula, e t represents the comprehensive electricity carbon emission factor of the industrial park at time t; e ex,t represents the exogenous carbon emission factor of electricity consumption in the industrial park at time t; e in,t represents the endogenous carbon emission factor of electricity consumption in the industrial park at time t; E ex,t E represents the amount of electricity purchased by the industrial park at time t; in,t Represents the self-generated electricity of the industrial park at time t.

[0043] Furthermore, the comprehensive heat carbon emission factor is obtained by the following formula:

[0044]

[0045] In the formula, h t represents the comprehensive heat carbon emission factor of the industrial park at time t; h ex,t represents the exogenous heat carbon emission factor of the industrial park at time t; h in,t represents the endogenous heating carbon emission factor of the industrial park at time t; H ex,t represents the purchased heat of the industrial park at time t; H in,t Represents the spontaneous heat generated by the industrial park at time t.

[0046] On the other hand, the present invention discloses a dynamic carbon emission accounting system for industrial parks, including: a dynamic carbon emission calculation module for fossil fuel combustion, a dynamic carbon emission calculation module for industrial processes, a dynamic carbon emission calculation module for waste treatment, a dynamic carbon emission calculation module for industrial park electricity consumption, and a dynamic carbon emission calculation module for industrial park heat consumption;

[0047] Among them, the fossil fuel combustion dynamic carbon emission calculation module:

[0048] Used to obtain the consumption of each fuel consumed by the industrial park and the corresponding carbon emission factor in real time, and obtain the dynamic carbon emission results of fossil fuel combustion in the industrial park based on the consumption of each fuel and the corresponding carbon emission factor;

[0049] The industrial process dynamic carbon emission calculation module:

[0050] Used to obtain in real time the industrial process activity level data of each production product at each moment in the industrial park and the corresponding production process carbon emission factor, and obtain the dynamic carbon emission results of fossil fuel combustion in the industrial park based on the industrial process activity level data and the corresponding production process carbon emission factor;

[0051] The waste treatment dynamic carbon emission calculation module:

[0052] Used to calculate the dynamic carbon emissions of solid waste based on the amount of solid waste generated by the industrial park at each moment and the corresponding carbon emission factor;

[0053] Calculate the dynamic carbon emissions of CH4 and N2O produced during sewage treatment based on the sewage generated at each moment in the industrial park;

[0054] and taking the dynamic carbon emission of the solid waste, as well as the dynamic carbon emission of CH4 and N2O, as the dynamic carbon emission result of waste treatment;

[0055] The industrial park electricity consumption dynamic carbon emission calculation module:

[0056] Used to obtain the exogenous electricity carbon emission factor and endogenous electricity carbon emission factor of the industrial park respectively, and obtain the comprehensive electricity carbon emission factor;

[0057] Calculate the dynamic carbon emission results of electricity consumption in the industrial park based on the comprehensive electricity carbon emission factor;

[0058] The industrial park uses a thermal dynamic carbon emission calculation module:

[0059] Used to obtain the exogenous heat carbon emission factor and endogenous heat carbon emission factor of the industrial park respectively, and obtain the comprehensive heat carbon emission factor;

[0060] Calculate the dynamic carbon emission results of heat use in the industrial park based on the comprehensive heat carbon emission factor

[0061] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a method and system for dynamic accounting of carbon emissions in an industrial park, which has the following beneficial effects:

[0062] Starting from the actual situation of industrial parks, the present invention refines the carbon emission sources of industrial parks and calculates the dynamic carbon emission results of each carbon emission source in real time, which can enable industrial parks to effectively perceive the carbon emission results of different carbon emission sources at different times, and provide guidance for further guiding industrial parks to reduce carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0064] Figure 1 This is the industrial park carbon accounting flow chart provided by the present invention.

[0065] FIG. 2( a ) is an organizational boundary diagram of an industrial park provided in an embodiment of the present invention.

[0066] FIG2( b ) is a schematic diagram of a method for calculating carbon emissions from electricity consumption in an industrial park provided in an embodiment of the present invention.

[0067] FIG3( a ) is a flow chart of an electrolytic aluminum production process in an industrial park provided in an embodiment of the present invention.

[0068] FIG3( b ) is a flow chart of a high-precision alloy wire production process in an industrial park provided by an embodiment of the present invention.

[0069] FIG3( c ) is a flow chart of the production process of high-precision aluminum plates and strips in an industrial park according to an embodiment of the present invention.

[0070] Figure 4 A schematic diagram of real-time calculation results of carbon emissions from fuel combustion in an industrial park provided in an embodiment of the present invention.

[0071] Figure 5 A schematic diagram of real-time calculation results of carbon emissions from industrial processes in an industrial park provided in an embodiment of the present invention.

[0072] Figure 6 A schematic diagram of real-time calculation results of carbon emissions from electricity consumption in an industrial park provided in an embodiment of the present invention.

[0073] Figure 7A schematic diagram of real-time calculation results of carbon emissions from electricity consumption in an industrial park provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0075] The embodiment of the present invention discloses a dynamic accounting system for carbon emissions in an industrial park, including the following models:

[0076] Dynamic accounting model for carbon emissions from fossil fuel combustion, dynamic accounting model for carbon emissions from industrial processes, dynamic accounting model for carbon emissions from waste treatment, dynamic accounting model for carbon emissions from electricity consumption, and dynamic accounting model for carbon emissions from heat use. Fossil fuel combustion is an independent major emission source, covering the carbon emissions generated by the combustion of fossil fuels in industrial parks. Industrial processes include carbon emissions generated in the production process, some of which come from the use of fossil fuels and others from chemical reactions. Carbon emissions are also generated in the waste treatment process, some of which may come from the use of fossil fuels. Carbon emissions caused by electricity demand in industrial parks usually come from fossil fuel power generation on the grid side, while carbon emissions from heat demand may come from direct combustion of fossil fuels. In order to better account for these emissions, the dynamic accounting model for carbon emissions from fossil fuel combustion, the dynamic accounting model for carbon emissions from industrial processes, the dynamic accounting model for carbon emissions from waste treatment, the dynamic accounting model for carbon emissions from electricity consumption, and the dynamic accounting model for carbon emissions from heat use can be used.

[0077] The following is a detailed introduction to each model.

[0078] 1) Dynamic accounting model of carbon emissions from fossil fuel combustion

[0079] The activity level data of fuels in industrial parks are derived from the statistical reports of the industrial parks. However, the data obtained through energy consumption ledgers and statistical reports have strong temporal and spatial lags, making it difficult to meet the development needs of modern industrial parks. Since the production and operation process of industrial parks remains stable over a period of time, the emission factors remain basically unchanged over a period of time. It is assumed that the changes in carbon emissions are driven by activity level data and the contribution of emission factors can be ignored. Based on this, this section realizes the real-time quantification of carbon emissions based on the dynamic activity level data regularly updated by industrial parks, and proposes a dynamic accounting model for fossil fuel combustion in industrial parks based on real-time activity data to solve the problems of low accuracy and strong lag in carbon emission accounting in industrial parks, as shown in equations (1-1)-(1-3):

[0080]

[0081] F i,t =NCV i FC i,t (1-2)

[0082] e f,i =CC i ·OF i β (1-3)

[0083] Where C f,t represents the carbon dioxide emissions from fuel combustion in the industrial park at time t, tons of carbon dioxide (tCO2); F i,t represents the amount of the i-th fuel consumed by the industrial park at time t, tons (t);

[0084] e f,i represents the carbon dioxide emission factor of the ith fuel, tons of carbon dioxide per gigajoules (tCO2 / GJ);

[0085] NCV i It indicates the net calorific value of fuel i, in GJ / t (solid and liquid fossil fuels), GJ / 104Nm3 (GJ / 104Nm3 3 )(gas fossil fuel);

[0086] FC i,t represents the heat consumption of fuel i at time t;

[0087] CC i Indicates the carbon content of the unit calorific value of fuel i, tons of carbon per gigajoules (tC / GJ);

[0088] OF i represents the carbon oxidation rate of fuel i, %;

[0089] β represents the CO2 gasification coefficient, which is 44 / 12.

[0090] Existing studies have shown that my country's raw coal has a high ash content, and the calorific value and carbon content of raw coal are 40% lower than the IPCC statistical recommended values. As shown in formula (1-3), the elemental carbon content and carbon oxidation rate will directly affect the emission of carbon dioxide. Since the carbon oxidation rates of different types of coal are different, in order to ensure the accuracy of the accounting model and accurately measure the carbon emission level of coal combustion, the actual measured values ​​of the unit calorific value carbon content and carbon oxidation rate should be considered, as shown in formula (1-4). If the unit calorific value carbon content and carbon oxidation rate of the coal combustion are not measured, the upper limit value is taken regardless of the type of coal (the upper limit value refers to the default value corresponding to the coal with the highest unit calorific value carbon content among all types of coal, and the carbon oxidation rate is taken as 100%).

[0091]

[0092] OF c Indicates the carbon oxidation rate of coal, %;

[0093] G z It represents the output of slag, tons (t);

[0094] C z Indicates the average carbon content of slag, tons (t);

[0095] G h It represents the fly ash production, tons (t);

[0096] C h Indicates the average carbon content of fly ash, %;

[0097] η cc Indicates the average dust removal efficiency of the dust removal system, %;

[0098] FC c Indicates coal consumption, tons (t);

[0099] NCV c It indicates the average lower calorific value of coal, in gigajoules per ton (GJ / t);

[0100] CC c Indicates the carbon content per unit calorific value of coal, ton of carbon per gigajoules (tC / GJ).

[0101] 2) Dynamic accounting model of industrial process carbon emissions

[0102] The industrial process carbon emission factor is determined by the production process and plays a vital role in calculating the carbon emissions of the industrial production process. However, the current industrial process carbon emission factors cover a small number of types, and most of the processes that are not covered refer to the carbon emission factors provided by the IPCC, which cannot meet the carbon emission calculation needs of different types of industrial processes. In addition, the production process of industrial products in China is very different from that of other countries. Therefore, the industrial process carbon emission factor should be corrected to more accurately calculate the carbon emissions generated by the industrial process. Based on this, a dynamic carbon accounting method for industrial processes that considers the correction of carbon emission factors is proposed. The carbon emissions generated by industrial processes can be expressed as:

[0103]

[0104] Where C p,t represents the carbon emissions generated by the industrial production process in the industrial park at time t;

[0105] P i,t represents the data of industrial process activity level at time t;

[0106] e p,i,tIt represents the carbon emission factor of the production process of product i produced by the industrial park at time t.

[0107] There are two methods to correct emission factors:

[0108] (1) If there is a local emission factor for an industrial product, this emission factor shall be used for accounting; the local emission factor for an industrial product refers to the greenhouse gas emissions per unit of product produced in a specific region or country.

[0109] (2) If there is no local emission factor, calculate it by production process. Calculate the weighted average of the carbon emission factors of each production process based on the proportion of the production process of a specific industrial product. Assuming that a product is produced by different processes, the emission factors of these products depend largely on the proportion of different processes. First, collect the emission factors of different processes and calculate the weighted average of each production process, and finally form a new comprehensive carbon emission factor for the industrial process.

[0110] The new weighted and corrected comprehensive carbon emission factor can be applied to the calculation formulas of Formulas 1-5.

[0111] The specific steps are as follows:

[0112] Decompose product production process: Divide each industrial product i into multiple production processes and determine the emission factor and weighting coefficient of each process.

[0113] Calculate the weighted average: For each production process, calculate the weighted average of its emission factors. This process can be expressed as follows:

[0114]

[0115] in,

[0116] ρ i is the emission factor of the ith production process, ξ i

[0117] is the weight coefficient of the ith production process.

[0118] The calculated comprehensive carbon emission factor E ω Applied to formula 1-5, it is used to calculate the total carbon emission factor of product i. Specifically, for each product i, it is divided into multiple production processes, and the weighted average of each production process is calculated to obtain the total carbon emission factor of product i.

[0119] In order to clearly describe the revised emission factors, the present invention defines the following matrix:

[0120] (a) Industrial production process coefficient matrix

[0121] The weighted coefficient matrix of the industrial production process is an N×1-order matrix, which is defined as the weighted coefficient of the industrial production process k and can be expressed as:

[0122] ξ=[ξ1,ξ2,…,ξ n ] T (1-6)

[0123] (b) Industrial production process emission factor matrix

[0124] The emission factor matrix of industrial production process is an N×1 matrix, which defines the emission factor of industrial production process k and can be expressed as:

[0125] p(t)=[p1(t),p2(t),…,p n (t)] T (1-7)

[0126] The comprehensive carbon emission factor of industrial processes is:

[0127] e p =ξ T ·p (1-8)

[0128] 3) Dynamic accounting model of carbon emissions from waste treatment

[0129] The carbon emissions generated by waste treatment in industrial parks can be calculated using the following formula:

[0130]

[0131] in, represents the methane CH4 carbon emission at time t, represents the emission of nitrous oxide (N2O) at time t;

[0132] For the carbon emissions from solid waste incineration, including carbon emissions from domestic waste, hazardous waste, and sludge treatment and disposal, the calculation formula is as follows:

[0133] E S,t =AD S,t ·EF S (1-10)

[0134] EF s =CCW i FCF i β (1-11)

[0135] Where E S,t represents the carbon emissions generated by solid waste incineration at time t;

[0136] AD S,t represents the amount of solid waste generated at time t;

[0137] EF S represents the emission factor;

[0138] CCW i It represents the carbon content ratio of the i-th type of waste;

[0139] FCF i Represents the proportion of mineral carbon in the i-th type of waste.

[0140] For sewage treatment, carbon emissions mainly include CH4 and N2O, which can be calculated by the following formulas:

[0141]

[0142] Where W t Refers to the total amount of all degradable organic matter removed from wastewater by sedimentation during the wastewater treatment process (these organic matter will settle to form sludge during the treatment process and thus be separated from the wastewater);

[0143] represents the emission factor of CH4;

[0144] Indicates the amount of CH4 recycled;

[0145] TN t Indicates the nitrogen content of sewage;

[0146] represents the emission factor of N2O.

[0147] In order to facilitate the subsequent statistics of total carbon emissions, it is necessary to unify the units of CH4 and N2O produced by sewage treatment and CO2 produced by other carbon emission sources. Therefore, CH4 and N2O are simplified to the form of carbon dioxide equivalent (tCO2e), and the greenhouse effect coefficient (GWP) is shown in Table 1-1.

[0148] Table 1-1 Greenhouse effect coefficients of some gases

[0149]

[0150] 4) Dynamic accounting model for carbon emissions from electricity consumption

[0151] Most of the currently commonly used electricity carbon emission factors are based on the national power grid average emission factor announced by the Ministry of Ecology and Environment in 2022. They do not distinguish between carbon emissions generated by green electricity and ordinary electricity, but obtain an average carbon emission factor based on the total carbon emissions generated by all electricity in the regional power grid. It is impossible to track the source composition of electricity consumed in different periods, nor can it reflect the carbon emissions of electricity consumption in industrial parks at different times. Considering that some industrial parks centered on high-energy-consuming enterprises are difficult to achieve energy supply and demand balance due to large terminal electrical loads, self-contained power plants are generally installed in the parks. Therefore, the electricity consumption of the park comes from two parts, one is the electricity purchased from outside the park, and the other is self-generated electricity in the park. Based on this, the present invention proposes the concept of a comprehensive electricity carbon emission factor, which includes two parts: an exogenous electricity carbon emission factor (defined as the electricity emission factor generated by the park's use of purchased electricity) and an endogenous electricity carbon emission factor (defined as the electricity emission factor generated by the power supply of the power plant inside the park).

[0152] The comprehensive electricity carbon emission factor of the park is defined as the dynamic emission factor generated by the electricity consumption process of the park. Its value is equal to the dynamic fusion of the exogenous electricity carbon emission factor and the endogenous electricity carbon emission factor, which can be expressed as:

[0153]

[0154] Where e t represents the comprehensive electricity carbon emission factor of the industrial park at time t;

[0155] e ex,t represents the exogenous carbon emission factor of electricity consumption in the industrial park at time t;

[0156] e in,t represents the endogenous carbon emission factor of electricity consumption in the industrial park at time t;

[0157] E ex,t It represents the amount of electricity purchased by the industrial park at time t;

[0158] E in,t Represents the self-generated electricity of the industrial park at time t.

[0159] The exogenous emission factor is calculated based on the carbon emission flow theory of the power system according to the energy supply information on the source side, the energy consumption information on the load side, and the power flow information, and is expressed as:

[0160]

[0161] Where e ex.t represents the exogenous carbon emission factor of electricity consumption in the industrial park in period t;

[0162] ρ b,t It represents the node carbon potential of node b in time period t;

[0163] Lb,t represents the load of node b in time period t;

[0164] B represents the set of nodes within the coverage of the regional power grid;

[0165] P i,t represents the output of generator set i in period t;

[0166] ρ i,t represents the carbon emission intensity of generator set i at time t;

[0167] P bj,t represents the power flow of line bj at time t;

[0168] ρ bj,t represents the carbon flow density of line bj at time t;

[0169] represents the set of lines that inject power into the node;

[0170] Represents the set of generator sets at node b.

[0171] Assuming that there are thermal power units, photovoltaic units and wind turbines in the industrial park, among which photovoltaic units and wind turbines are new energy units, without considering the construction and subsequent operation and management of the power station, the carbon emissions per kilowatt-hour generated by the new energy power generation in the industrial park can be equivalent to zero. Therefore, the endogenous carbon emission factor of the industrial park is essentially the carbon emission factor of thermal power generation.

[0172] The endogenous electricity emission factor can be calculated using formula (3-17):

[0173]

[0174] Where e in,t represents the endogenous carbon emission factor of electricity consumption in the industrial park during period t;

[0175] ζ g,t represents the carbon emission coefficient of the g-th unit in the industrial park at time t;

[0176] W h,g,t represents the power generation of the g-th unit at time t in the industrial park;

[0177] m represents the number of thermal power units.

[0178] In order to reflect the additionality of green electricity and encourage enterprises in the park to use green electricity, according to the green electricity accounting method, it is considered that the carbon emissions of green electricity are zero, and the electricity mainly used is purchased through the green electricity trading platform of the power trading center through inter-provincial transactions and actually executed and settled. Therefore, the carbon emission measurement model of the park's electricity consumption is as follows:

[0179]

[0180] Where C e,t represents the carbon emissions from electricity consumption in the industrial park at time t;

[0181] E t represents the power consumption of the industrial park at time t;

[0182] E gt Represents the green electricity usage of the industrial park at time t.

[0183] 5) Use thermal carbon emission dynamic accounting model

[0184] The carbon emissions from purchased heat in my country are generally calculated using the default value of the heat emission factor, which actually represents the average level of the entire region and cannot calculate the carbon emissions generated by heat use in real time. Although the use of default values ​​improves simplicity and consistency, there are differences in fuel levels between different regions, which is not conducive to promoting the low-carbonization of thermal fuel production itself. The present invention assumes that the heat used in industrial parks can come from both external purchases and self-production. Similar to the carbon emission measurement method for electricity consumption, the concept of a comprehensive heat carbon emission factor is proposed, which includes two parts: an exogenous heat carbon emission factor (i.e., the heat emission factor generated by the park's use of purchased heat) and an endogenous heat carbon emission factor (i.e., the heat emission factor produced by the park's own production).

[0185] The exogenous electricity emission factor adopts the thermal emission factor of the area where the park is located. The endogenous electricity emission factor is based on the dynamic accounting method of carbon emissions from fuel combustion to calculate the carbon emissions of the park's self-generated heat.

[0186] Specifically, the carbon emission factor of endogenous heat (i.e. the carbon emission factor of the park's own heat) is calculated using formula (1-19):

[0187]

[0188] Where h in,t represents the endogenous heat carbon emission factor of the industrial park at time t;

[0189] C f-heat represents the carbon emissions from fossil fuel consumption for heating in industrial parks;

[0190] H in,t Represents the total heat supply of the industrial park at time t.

[0191] Exogenous heat carbon emission factor h ex,t (i.e., the heat emission factor generated by the park's use of purchased heat). The specific calculation formula is similar to 1-19:

[0192]

[0193] Among them, Cf ′ -heat represents the carbon emissions from the park’s outsourced heat consumption, H ex,t It indicates the additional heat generated by the heat purchased from outside by the industrial park;

[0194] According to the obtained industrial park exogenous heat carbon emission factor h ex,t and endogenous heat carbon emission factor h in,t , we get the comprehensive carbon emission factor ht and then the total comprehensive consumption of the industrial park. The specific formulas are shown in 1-20 and 1-21.

[0195]

[0196] C h,t =h n,t H t (1-21)

[0197] Where C h,t represents the heat carbon emission of the industrial park at time t;

[0198] H t It represents the total heat consumption inside and outside the industrial park at time t.

[0199] The present invention is described in more detail below by taking a certain industrial park as an example.

[0200] 1. Park Overview

[0201] The present invention takes a certain industrial park as the research object, which covers an area of ​​0.68 square kilometers, and the internal organizational structure diagram of the boundary is shown in Figure 2. Among them, Figure 2 (a) shows the organizational boundary diagram. Figure 2 (b) shows a schematic diagram of the electricity carbon emission accounting method.

[0202] The park has 1 electrolysis workshop, 1 anode assembly workshop, 1 wire rod workshop, 1 casting and rolling workshop, 1 cold rolling workshop, 1 packaging workshop, 1 100-meter chimney and 1 60-meter chimney. The park is equipped with an online monitoring system and energy management system.

[0203] 2. Analysis of main production and operation systems

[0204] The process flow of the industrial park mainly includes electrolytic aluminum production, high-precision alloy wire production, and high-precision aluminum strip production, as shown in Figure 3. Among them, Figure 3 (a) shows the electrolytic aluminum production process flow chart, and Figure 3 (b) shows the high-precision alloy wire production process flow chart. Figure 3 (c) shows the high-precision aluminum strip production process flow chart. Through field investigation and investigation, it is known that industrial process carbon emissions mainly occur in anode consumption and anode effect during electrolytic aluminum production. Industrial process carbon emissions during the production of high-precision alloy wire and aluminum strip are very small, so they can be ignored.

[0205] The energy consumption of the industrial park is mainly electricity and natural gas, among which electricity is used more; the main energy-consuming equipment is mainly concentrated in the electrolysis plant, wire rod plant, casting and rolling plant, etc. The main energy-consuming equipment and energy types are shown in Table 1. In addition, the main products of the park are aluminum ingots, high-precision alloy wire rods, and high-precision aluminum plates, strips and foils. Its output in 2023 is shown in Table 2.

[0206] Table 1 Schematic diagram of energy-consuming equipment and energy types in an industrial park

[0207]

[0208] Table 2 Main product output information

[0209]

[0210] 3. Accounting boundary scope and emission source type identification

[0211] The accounting boundary of the industrial park includes all direct production systems, auxiliary production systems and affiliated production systems that provide direct services to the industrial production in the park. The production systems include: electrolysis plant, anode assembly plant, wire pole plant, casting and rolling plant, cold rolling plant, packaging plant, etc. The auxiliary production systems include power supply, water supply and gas supply facilities, etc. The affiliated production systems include canteens and office buildings, etc.

[0212] The information of main emission sources is shown in Table 3. The emission types mainly include:

[0213] (1) Fossil fuel combustion emissions: This part mainly includes CO2 emissions caused by the combustion of natural gas.

[0214] (2) Emissions from industrial production processes: mainly CO2 emissions caused by anode consumption (carbon anode is a reducing agent in electrolytic aluminum production) and perfluorocarbon (C2F6 and CF4) emissions caused by anode effect.

[0215] (3) Waste treatment emissions: mainly include CO2, CH4, and N2O emissions caused by solid waste, hazardous waste, and domestic garbage. Solid waste includes waste carbon blocks, flue gas desulfurization ash, dust removal ash from anode workshops and ladle cleaning workshops, etc., which are sold for external use; hazardous waste includes carbon slag and overhaul slag.

[0216] (4) Electricity emissions: The park purchases electricity from the grid and does not export any electricity.

[0217] Table 3 Information on major emission sources

[0218]

[0219] In view of the extremely small amount of gasoline used in the park, and considering that this part of the emissions has a very small impact on the total emissions, this part of the emissions is ignored in the calculation; the solid waste and hazardous waste in the park will be recycled, and the waste treatment has a very small impact on the total emissions, so this part of the emissions is ignored in the calculation.

[0220] In addition, the above steps also include the carbon emissions from heat generated by the casting and rolling plant and the cold rolling plant during the processing process when heating or cooling is required.

[0221] 4. Dynamic calculation results of carbon emissions

[0222] 1) Dynamic accounting results of carbon emissions from fossil fuel combustion

[0223] Figure 4 It shows the dynamic accounting results and changes of carbon emissions from fossil fuel combustion in the industrial park on December 21, 2023. After analyzing the emission sources and energy types of the industrial park, it was found that fossil fuel combustion emissions are mainly generated by the melting furnace and annealing furnace in the wire rod branch workshop and the casting and rolling equipment in the casting and rolling branch. After investigation, it was found that the operation time of this branch is 8:00-18:00, and the workshop equipment is not running at other times. Therefore, part of the carbon emissions are generated during the factory operation time of 8:00-18:00. Figure 4 It can be seen that the growth trend of carbon emissions from fuel combustion during this period is relatively stable, which also confirms the conclusion in Section 1 that the production and operation process of industrial parks remains stable over a period of time. The proposed dynamic accounting method for carbon emissions from fuel combustion in industrial parks based on real-time activity data is effective. By regularly updating dynamic activity level data, accurate quantification of carbon emissions from fuel combustion in the park can be achieved, overcoming the time lag problem of carbon emissions from fuel combustion in industrial parks.

[0224] 2) Dynamic accounting results of industrial process carbon emissions

[0225] From the analysis of the main production and operation systems in Section 2, it can be seen that the industrial process emissions of the industrial park mainly exist in the anode consumption and anode effect process of the electrolysis plant. The production of electrolytic aluminum requires a certain amount of carbon anode as raw material for electrolysis. During the electrolysis process, the electrolytic cell will have an anode effect and produce a large amount of C2F6 and CF4. It can be seen that the industrial production process of the park can be decomposed into two parts, one is the anode consumption process, and the other is the anode effect process. As shown in Table 4, the weighted average of the carbon emission factors of each production process is calculated according to the proportion of production links, and an industrial process carbon emission factor for the comprehensive anode consumption and anode effect process can be obtained. The activity level data of carbon anodes comes from the energy ledger records of the park, which are updated every hour. In order to facilitate the calculation of the total carbon emissions of the industrial park, C2F6 and CF4 generated by the industrial process are converted into carbon dioxide equivalents according to the greenhouse effect coefficient (GWP). The GWP of C2F6 and CF4 is shown in Table 5. The electricity used in the electrolysis process is calculated in the carbon emissions of electricity consumption, and it will not be repeated here. Only the carbon emissions generated by the industrial process are discussed here.

[0226] Table 4 Proportion of industrial processes in the industrial park

[0227]

[0228] Table 5 Greenhouse effect coefficients of C2F6 and CF4

[0229]

[0230] The present invention refers to the electrolytic aluminum production part in the nonferrous metal industry standard of the People's Republic of China to calculate the anode consumption in the electrolysis process and the carbon emission in the anode effect process. Figure 5 The results and changes of the dynamic calculation of carbon emissions from industrial processes in the industrial park are shown. Figure 5 It can be seen that the carbon emissions generated by the industrial process of the park account for a larger proportion than the carbon emissions generated by the combustion of fossil fuels, and the accounting of this part is indispensable. For this part, the investigation and analysis of the main production and operation systems of the park are crucial. Although the production and operation systems of various parks vary greatly, as long as the production process is understood, the weighted average of the carbon emission factors of each production process is calculated based on the proportion of the production process of specific industrial products, and the comprehensive carbon emission factor of the industrial process can be obtained, thereby calculating the carbon emissions of the industrial process.

[0231] 3) Dynamic calculation results of carbon emissions from electricity consumption

[0232] Based on the hourly electricity carbon emission factor data of the industrial park, the present invention conducts a dynamic accounting analysis of the industrial park's electricity carbon emission. The dynamic curve of the comprehensive electricity emission factor and the carbon emission situation in each period are as follows: Figure 6 shown.

[0233] Figure 6 It shows the real-time changes in carbon emissions from electricity consumption in the industrial park at different time periods. Figure 6 It can be seen that the industrial park's electricity consumption has high carbon emission factor periods from 1:00-7:00, 12:00-14:00, and 21:00-24:00, and the carbon emission high emission period is from 8:00-18:00. According to the results of the park survey, the electrolysis plant and the anode assembly plant implement a three-shift work mechanism, and the pole plant, casting and rolling plant, cold rolling plant and packaging plant work from 8:00-18:00. In the production process of the above plants, most of the carbon emissions come from the park's electricity consumption, so the high carbon emission period is from 8:00-18:00. Through the dynamic accounting of carbon emissions of each plant in the park, the carbon emissions of electricity consumption in the industrial park at different times can be reflected. The park can also perceive the differences in electricity carbon emissions in each period through the dynamic electricity carbon emission factor, minimize the high carbon emission factor period, and reduce carbon emissions.

[0234] The pole plant, casting and rolling plant, cold rolling plant and packaging plant in the park have integrated production lines for green hydropower aluminum materials. According to the green power accounting method, the carbon emissions of green power are considered to be zero. Therefore, the carbon emissions of the park's electricity consumption need to be calculated after deducting the green power usage. The results are as follows: Figure 7 shown.

[0235] 4) Emissions share of each part

[0236] The proportion of carbon emissions from various emission sources in the industrial park on December 21, 2023. Analysis shows that for this industrial park, the most important carbon emission is electricity consumption, and the carbon emissions corresponding to the electricity consumption of this industrial park account for 69% of the total carbon emissions of the entire park. Carbon emissions from fuel combustion are the lowest, accounting for only 7% of the total carbon emissions of the entire park. Carbon emissions from industrial processes are between carbon emissions from electricity consumption and carbon emissions from fuel combustion, accounting for 24% of the total carbon emissions of the entire park.

[0237] To this end, the present invention takes into account the integrity of the measurement results and the development needs of the carbon trading market, and considers five parts: fossil fuel combustion, industrial processes, waste treatment, electricity consumption and heat consumption respectively, extracts the dynamic real-time elements of each part, and proposes a dynamic carbon emission accounting method and system for the actual needs of industrial parks.

[0238] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0239] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for dynamic carbon emission accounting in an industrial park, characterized in that: include: Obtain real-time dynamic carbon emission results for five parts of the industrial park: fossil fuel combustion, industrial processes, waste treatment, electricity and heat consumption; The dynamic carbon emission results of fossil fuel combustion are obtained by the following steps: Obtain the consumption of each fuel consumed by the industrial park and the corresponding carbon emission factor in real time, and obtain the dynamic carbon emission results of fossil fuel combustion in the industrial park based on the consumption of each fuel and the corresponding carbon emission factor; The dynamic carbon emission results of the industrial process are obtained by the following steps: Obtaining in real time the industrial process activity level data and the corresponding production process carbon emission factors of each product produced in the industrial park at each moment, and obtaining the dynamic carbon emission results of fossil fuel combustion in the industrial park based on the industrial process activity level data and the corresponding production process carbon emission factors; The dynamic carbon emission results of the waste treatment are obtained by the following steps: Calculate the dynamic carbon emissions of solid waste based on the amount of solid waste generated by the industrial park at each moment and the corresponding carbon emission factor; Calculate the dynamic carbon emissions of CH4 and N2O produced during sewage treatment based on the sewage generated at each moment in the industrial park; The dynamic carbon emission of the solid waste, as well as the dynamic carbon emission of CH4 and N2O are taken together as the dynamic carbon emission result of waste treatment; The dynamic carbon emission results of electricity consumption are obtained by the following steps: Obtain the exogenous electricity carbon emission factor and endogenous electricity carbon emission factor of the industrial park respectively, and obtain the comprehensive electricity carbon emission factor; Calculate the dynamic carbon emission results of electricity consumption in the industrial park based on the comprehensive electricity carbon emission factor; The thermal carbon emission record is obtained by the following steps: Obtain the exogenous heat carbon emission factor and endogenous heat carbon emission factor of the industrial park respectively, and obtain the comprehensive heat carbon emission factor; The dynamic carbon emission results of heat use in the industrial park are calculated based on the comprehensive heat carbon emission factor.

2. According to claim 1, a method for dynamic calculation of carbon emissions in an industrial park is characterized in that: According to the consumption of each fuel and the corresponding carbon emission factor, the dynamic carbon emission results of fossil fuel combustion in the industrial park are obtained through the following formula: F i,t =NCV i ·FC i,t ; e f,i =CC i ·OF i ·β; In the formula, C f,t represents the carbon dioxide emissions from fuel combustion in the industrial park at time t; F i,t represents the amount of the i-th fuel consumed by the industrial park at time t; e f,i NCV represents the carbon dioxide emission factor of the i-th fuel; i Indicates the net calorific value of the i-th fuel; FC i,t represents the consumption of the i-th fuel at time t; CC i Indicates the carbon content of the unit calorific value of the i-th fuel; OF i represents the carbon oxidation rate of the i-th fuel; β represents the CO2 gasification coefficient.

3. The method for dynamic calculation of carbon emissions in an industrial park according to claim 2 is characterized in that: When the i-th fuel consumed by the industrial park is raw coal, the carbon oxidation rate is obtained by the following formula: In the formula, OF c Indicates the carbon oxidation rate of coal; G z Indicates the output of slag; C z Indicates the average carbon content of the slag; G h Indicates the yield of fly ash; C h Indicates the average carbon content of fly ash; η cc Indicates the average dust removal efficiency of the dust removal system; FC c Indicates coal consumption; NCV c Indicates the average lower calorific value of coal; CC c Indicates the carbon content per unit calorific value of coal.

4. The method for dynamic calculation of carbon emissions in an industrial park according to claim 1, characterized in that: The dynamic carbon emission results of fossil fuel combustion in industrial parks are obtained based on the industrial process activity level data and the corresponding production process carbon emission factors, which are achieved through the following formula: In the formula, C p,t represents the carbon emissions generated by the industrial production process in the industrial park at time t; P i,t represents the process activity level data when the industrial park produces the i-th product at time t; e p,i,t It represents the carbon emission factor of the production process when the industrial park produces the i-th product at time t.

5. The method for dynamic calculation of carbon emissions in an industrial park according to claim 1, characterized in that: The dynamic carbon emissions of solid waste are calculated based on the amount of solid waste generated at each moment in the industrial park and the corresponding carbon emission factor, which is achieved through the following formula: E S,t =AD S,t ·EF S ; EF s =CCW i ·FCF i ·β; In the formula, E S,t represents the carbon emissions generated by solid waste incineration in the industrial park at time t; AD S,t represents the amount of solid waste generated by the industrial park at time t; EF S Indicates the corresponding carbon emission factor; CCW i Indicates the carbon content ratio of the i-th type of solid waste; FCF i Represents the proportion of mineral carbon in the i-th category of solid waste.

6. The method for dynamic calculation of carbon emissions in an industrial park according to claim 1, characterized in that: The dynamic carbon emissions of CH4 and N2O generated during sewage treatment are calculated based on the sewage generated at each moment in the industrial park, which is achieved through the following formula: Where W t It indicates the total amount of degradable organic matter that is removed and settled in the form of sludge; represents the emission factor of CH4; Indicates the amount of CH4 recycled; TN t Indicates the nitrogen content of sewage; represents the emission factor of N2O.

7. The method for dynamic calculation of carbon emissions in an industrial park according to claim 1, characterized in that: The comprehensive electricity carbon emission factor is obtained by the following formula: In the formula, e t represents the comprehensive electricity carbon emission factor of the industrial park at time t; e ex,t represents the exogenous carbon emission factor of electricity consumption in the industrial park at time t; e in,t represents the endogenous carbon emission factor of electricity consumption in the industrial park at time t; E ex,t E represents the amount of electricity purchased by the industrial park at time t; in,t Represents the self-generated electricity of the industrial park at time t.

8. The method for dynamic calculation of carbon emissions in an industrial park according to claim 1 is characterized in that: The comprehensive heat carbon emission factor is obtained by the following formula: In the formula, h t represents the comprehensive heat carbon emission factor of the industrial park at time t; h ex,t represents the exogenous heat carbon emission factor of the industrial park at time t; h in,t represents the endogenous heating carbon emission factor of the industrial park at time t; H ex,t represents the purchased heat of the industrial park at time t; H in,t Represents the spontaneous heat generated by the industrial park at time t.

9. An industrial park carbon emissions dynamic accounting system, characterized in that: include: Dynamic carbon emission calculation module for fossil fuel combustion, dynamic carbon emission calculation module for industrial processes, dynamic carbon emission calculation module for waste treatment, dynamic carbon emission calculation module for electricity consumption in industrial parks, and dynamic carbon emission calculation module for heat consumption in industrial parks; Among them, the fossil fuel combustion dynamic carbon emission calculation module: Used to obtain the consumption of each fuel consumed by the industrial park and the corresponding carbon emission factor in real time, and obtain the dynamic carbon emission results of fossil fuel combustion in the industrial park based on the consumption of each fuel and the corresponding carbon emission factor; The industrial process dynamic carbon emission calculation module: Used to obtain in real time the industrial process activity level data of each production product at each moment in the industrial park and the corresponding production process carbon emission factor, and obtain the dynamic carbon emission results of fossil fuel combustion in the industrial park based on the industrial process activity level data and the corresponding production process carbon emission factor; The waste treatment dynamic carbon emission calculation module: Used to calculate the dynamic carbon emissions of solid waste based on the amount of solid waste generated by the industrial park at each moment and the corresponding carbon emission factor; Calculate the dynamic carbon emissions of CH4 and N2O produced during sewage treatment based on the sewage generated at each moment in the industrial park; and taking the dynamic carbon emission of the solid waste, as well as the dynamic carbon emission of CH4 and N2O, as the dynamic carbon emission result of waste treatment; The industrial park electricity consumption dynamic carbon emission calculation module: Used to obtain the exogenous electricity carbon emission factor and endogenous electricity carbon emission factor of the industrial park respectively, and obtain the comprehensive electricity carbon emission factor; Calculate the dynamic carbon emission results of electricity consumption in the industrial park based on the comprehensive electricity carbon emission factor; The industrial park uses a thermal dynamic carbon emission calculation module: Used to obtain the exogenous heat carbon emission factor and endogenous heat carbon emission factor of the industrial park respectively, and obtain the comprehensive heat carbon emission factor; The dynamic carbon emission results of heat use in the industrial park are calculated based on the comprehensive heat carbon emission factor.

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