Petrochemical product life cycle carbon footprint accounting method and tool

Abstract

The invention discloses a petrochemical product life cycle carbon footprint accounting method and tool, and solves the problems of inaccurate result caused by model black box operation, poor applicability to specific products and neglect of carbon emission of key links under a complex process in existing petrochemical product carbon footprint evaluation. The method comprises: determining a target product and a system boundary; establishing a technological process model according to the target product production process; the technological process model is analyzed and divided into a plurality of modules; performing list analysis on the modules to obtain material data related to carbon footprints; establishing a product carbon footprint accounting model of the module based on a life cycle evaluation method; and according to the carbon footprint accounting model of each product, calculating the carbon footprint of the petrochemical product and carrying out result analysis. Systematic carbon footprint evaluation is carried out according to the life cycle, modular processing is carried out on the technological process, and under the conditions of complexity of a production system and data incompleteness, accuracy and high efficiency of carbon footprint evaluation are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission, and in particular to a method and tool for calculating carbon footprint of a petrochemical product life cycle. Background Art

[0002] The complex production process of the petrochemical industry involves multiple interrelated unit processes, such as cracking, distillation, hydrogenation, etc. Each unit process consumes a lot of energy and raw materials and produces corresponding emissions, so accurately assessing the carbon footprint of these processes is crucial for environmental management and decision support.

[0003] There are some carbon footprint calculation methods developed specifically for the petrochemical industry, but the existing methods still have the following shortcomings: Since the production process of petrochemical products is very complex, it requires highly specialized knowledge and skills to be used correctly. In order to avoid this problem, most carbon footprint assessment methods choose to use the petrochemical product carbon footprint model for black box processing, which not only reduces the value of carbon footprint assessment in the petrochemical industry, but may also lead to inaccurate results.

[0004] There are many types of petrochemical products, and existing carbon footprint assessment methods have failed to fully develop detailed standards and guidelines for specific types of petrochemical products, resulting in poor applicability of assessment methods to specific products.

[0005] Products in the petrochemical industry often involve complex process technologies and multi-stage processing flows. Existing methods lack sufficient flexibility in dealing with these complexities and may ignore carbon emissions at key links. Summary of the invention

[0006] The present invention mainly aims to solve the problems of inaccurate results caused by black box operation of the model in the existing petrochemical product carbon footprint assessment, poor applicability to specific products, and neglect of carbon emissions in key links under complex processes, and provides a petrochemical product life cycle carbon footprint accounting method and accounting tool.

[0007] The above technical problem of the present invention is mainly solved by the following technical solution: A method for calculating the carbon footprint of a petrochemical product life cycle comprises the following steps: Determine the target product and system boundaries, and establish a process model based on the target product production process; Analyze and divide the process flow model into several modules; Conduct inventory analysis on the modules to obtain material data related to carbon footprint; Establish a modular product carbon footprint accounting model based on the life cycle assessment method; According to the carbon footprint accounting model of each product, the carbon footprint of petrochemical products is calculated and the results are analyzed.

[0008] The present invention calculates the carbon footprint of petrochemical products based on the life cycle assessment method. By modularizing the process flow, it can ensure the accuracy and efficiency of carbon footprint assessment under the complexity of the production system and data incompleteness, and provide a reliable and scientific basis for product carbon footprint impact analysis in the petrochemical industry.

[0009] As a preferred solution, the target products for accounting are determined based on the life cycle assessment method, and the inputs and outputs within the boundaries of the research system are determined. The inputs include direct raw materials, indirect auxiliary materials and public works, and the outputs include transportation emissions, three wastes emissions, and direct greenhouse gas emissions.

[0010] Based on the life cycle assessment method, the system boundary is determined according to the petrochemical product process flow. The system boundary includes all inputs and outputs of the process flow. The input includes direct raw materials, indirect auxiliary materials and public works, and the output includes transportation emissions, three waste emissions, and direct greenhouse gas emissions. Among them, public works are specifically the energy consumed in the production process of products, including electricity, water, wind, etc. The system boundary of the study includes raw material acquisition and product generation, that is, the process from cradle to gate, without considering product use and product waste disposal.

[0011] As a preferred solution, the establishment of the process flow model specifically includes: Based on the entire production process of petrochemical products, the material input and output of the process units are determined, and the sequence of the process units is associated to build a petrochemical product process model.

[0012] This scheme takes the process unit as the basic unit according to the process flow, and determines the material input and output of each process unit, including key raw materials, indirect auxiliary materials, public works, direct emissions and three waste emissions, etc. Arrows or lines are used to represent material flow or energy flow, and each process unit is connected in sequence to form a process path, and a process flow model of petrochemical products is constructed.

[0013] As a preferred solution, the process flow model is analyzed and divided into several modules, specifically including: The process flow model is divided into modules based on the data integrity of the device input and output, and several modules are obtained after the division. The minimum scale of the module is the device level.

[0014] In actual production, not every process unit can be counted with complete inventory data for carbon footprint accounting. Therefore, it is necessary to modularize the process flow to ensure that the final output product of each accounting module is traceable. Steps for module division: First, for devices without product output, treat them as intermediate processes and part of the process of input and output of the corresponding product, and judge whether to merge them with upstream devices. Secondly, during the merging process, the material input and direct emission data of all upstream devices are included in the device with final product output. The merged module only needs to retain the final input and output data. Finally, for devices with missing data, they are packaged as a whole according to the existing available data and calculated as a separate module. When the data collection mechanism is improved, the modules can be further split and refined to improve the accuracy and resolution of the accounting. Reasonable division of modules can simplify the data collection and model building process, and avoid the difficulty in calculating the carbon footprint of recycled materials and multiple products due to complex processes. According to the data integrity of input and output, that is, according to the overall process from input raw materials to output usable products, the devices of this complete process are divided into modules. The available product is not an intermediate product, but a final product or a derivative product. The intermediate product is not a product. It may be the output of the device, but it is only an intermediate product that provides other devices with raw materials for producing products. The divided module is the smallest process that can collect complete input and output data.

[0015] As a preferred solution, the module's product carbon footprint accounting model is the sum of the carbon footprint of raw materials and auxiliary materials, the carbon footprint of public works, the carbon footprint of direct greenhouse gas emissions, the carbon footprint of transportation, and the carbon footprint of three waste emissions.

[0016] This plan uses a life cycle assessment to calculate the greenhouse gases generated during the production of petrochemical products, and converts other greenhouse gases into carbon dioxide equivalent (CO2-eq). The carbon footprint of the product is calculated using the principles of mass distribution and cyclic iteration. The carbon footprint accounting model for each module is the sum of the carbon footprint of raw materials and auxiliary materials, the carbon footprint of public works, the carbon footprint of direct greenhouse gas emissions, the carbon footprint of transportation, and the carbon footprint of three waste emissions. The specific calculation formula is: GHG=GHG M + GHG E + GHG T + GHG D + GHG W Among them, GHG represents the carbon footprint of the module's product production process, kgCO2-eq / ton, GHG M The carbon footprint of raw materials and auxiliary materials is the carbon emissions from the production of raw materials and auxiliary materials required in the production process. E The carbon footprint of utilities is the carbon emissions from utilities required in the production process. TThe transportation carbon footprint refers to the carbon emissions generated by the transportation of raw materials and auxiliary materials required for the production process. D Indicates the carbon footprint of direct greenhouse gas emissions, that is, direct greenhouse gas emissions during the production process, GHG W It represents the carbon footprint of three waste emissions, namely the carbon emissions from the disposal of three wastes in the production process.

[0017] As a preferred solution, the carbon footprint of raw and auxiliary materials is calculated as: the sum of the products of the mass of each material consumed in the process and the corresponding carbon footprint factor, the sum of the products of the carbon footprint of each recycled material and the mass of the corresponding recycled material, and the quotient of the total mass of all products of the module.

[0018] The carbon footprint of raw materials and auxiliary materials is the greenhouse gas emissions generated by the direct raw materials and indirect auxiliary materials consumed in the process of producing each ton of product in the module at their respective production stages. The specific calculation of the carbon footprint of raw materials and auxiliary materials is the sum of the products of the mass of each material consumed in the process and the corresponding carbon footprint factor, plus the sum of the products of the carbon footprint of each recycled material and the mass of the corresponding recycled material, and the quotient of the sum of the products of the mass of all products in the module. The specific calculation formula is: GHG M =(∑ i m i k i +∑ j GHG j m j ) / ∑ n m n Among them, m i Indicates the mass of raw materials and auxiliary materials, tons, k i represents the carbon footprint factor of raw materials, kgCO2-eq / ton, i represents the type of raw materials, m n represents the mass of the module product, tons, n represents the type of product, GHG j represents the carbon footprint of recycled materials, kgCO2-eq / ton, and j represents the type of recycled materials.

[0019] Circulating materials are the products produced by process units and used as raw materials or auxiliary materials for upstream units. The carbon footprint of circulating materials meets the calculation of the module product carbon footprint accounting model. In actual calculations, the initial value can be assumed to perform cyclic iterative calculations. When the error between the calculation result and the iterative result does not meet the requirements, the current calculation result is used as the initial value of the iteration and the iterative calculation is continued until the error between two consecutive iteration results meets the requirements and the calculation is stopped, that is, the error is less than 0.1%. The calculated value at the end of the iteration is the carbon footprint of the module product.

[0020] As a preferred solution, the utility carbon footprint is calculated as: the quotient of the sum of the products of the utility consumption and the corresponding carbon footprint factor and the sum of the mass of all products of the module; The utility carbon footprint is the greenhouse gas carbon emissions generated by the module production process for each ton of product. The specific calculation formula is: GHG E =∑ e E e k e / ∑ n m n Among them, E e represents the consumption of public works, k e It represents the carbon footprint factor corresponding to the public works, kgCO2-eq / ton, and e represents the type of public works.

[0021] As a preferred solution, the transportation carbon footprint is calculated as: the quotient of the product of transportation mass, transportation distance and transportation carbon footprint factor and the total mass of all products in the module.

[0022] The transportation carbon footprint is the greenhouse gas emissions generated during the transportation of raw materials and auxiliary materials used in the production of each ton of product in the module. The specific transportation carbon footprint is calculated as the product of transportation mass, transportation distance, and transportation carbon footprint factor, and the quotient of the total mass of all products in the module. The specific calculation formula is: GHG E =(W*H*k t ) / ∑ n m n Where W represents the transport mass, tons, and H represents the transport distance, kilometers, k t It represents the transport carbon footprint factor, kgCO2-eq / ton-km.

[0023] As a preferred solution, the carbon footprint of direct greenhouse gas emissions is calculated as: the quotient of the direct greenhouse gas emissions and the total mass of all products of the module.

[0024] The carbon footprint of direct greenhouse gas emissions is the direct greenhouse gas emissions during the production of each ton of product. The specific calculation formula is: GHG D = GHG1 / ∑ n m n Among them, GHG1 represents direct emissions from the production process, kgCO2-eq / ton.

[0025] As a preferred solution, the carbon footprint of the three waste emissions is calculated as: the quotient of the sum of the product of the mass of each waste and the corresponding waste treatment carbon footprint factor and the sum of the mass of all products of the module.

[0026] The carbon footprint of three waste emissions is the greenhouse gas carbon emissions generated by the disposal of three waste emissions during the production of each ton of module products. The specific calculation formula is: GHG W = ∑ y m y k y / ∑ n m n Among them, m y Indicates waste mass, tons, k y It represents the carbon footprint factor of waste treatment, kgCO2-eq / ton.

[0027] A petrochemical product life cycle carbon footprint accounting tool, including: Input unit, input basic product information and material data; A target determination unit determines the target product and system boundaries based on the input data; The process generation unit establishes a process model according to the target product production process; Module division unit, which divides the process model into several modules based on the data integrity of the device input and output, and the minimum scale of the module is the device level; The model generation unit, based on the product life cycle assessment, establishes the product carbon footprint accounting model of each module according to the system boundary; The result analysis unit calculates the carbon footprint of petrochemical products according to the carbon footprint accounting model of each product and analyzes the carbon footprint results of petrochemical products.

[0028] Therefore, the advantages of the present invention are: 1. Carry out systematic carbon footprint assessment of petrochemical products according to their life cycle. By modularizing the process flow, the accuracy and efficiency of carbon footprint assessment can be ensured under the conditions of complexity of the production system and incomplete data, providing a reliable and scientific basis for environmental impact analysis of the petrochemical industry.

[0029] 2. Based on life cycle assessment, it can cover every link from raw material acquisition, production and processing to waste disposal, ensuring that every potential emission source is taken into consideration. Comprehensive coverage can prevent the overall carbon footprint from being underestimated due to the omission of a certain link.

[0030] 3. The process flow is divided into modules based on the process unit as the smallest module unit and the data integrity of the device input and output to avoid the difficulty in calculating the carbon footprint of recycled materials and multiple products due to complex processes. Module division can simplify the data collection and model building process and improve work efficiency.

[0031] 4. Through process flow and modular division, the carbon footprint modeling process is made transparent, making it easier for users to understand the product model, ensuring the scientificity and reliability of the research results, while helping to improve the credibility of the research and providing a basis for future improvement and optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of a process of the present invention. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0034] Embodiment 1: This embodiment provides a method for calculating the carbon footprint of a petrochemical product life cycle. Figure 1 As shown, the following steps are included: S1. Determine the target product and system boundaries.

[0035] As a preferred solution of this embodiment, the target product and system boundary are determined according to the input product basic data. The input basic data includes information such as product name, industry, functional unit, system boundary, production process, process raw materials, geographical location, accounting cycle, etc. The target product to be carbon footprinted is determined according to the product name. The system boundary is a simple description of the carbon footprint accounting scope of the product, such as the production process, according to the system boundary information. The input and output within the system boundary are determined based on the life cycle assessment method, wherein the input includes direct raw materials, indirect auxiliary materials and public works, and the output includes transportation emissions, three waste emissions, and direct greenhouse gas emissions, wherein the public works are specifically the energy consumed in the process of producing products, including electricity, water, wind and gas energy, and the three waste emissions are the disposal emissions of wastewater, waste gas, and waste. For petrochemical products, the system boundary studied includes raw material acquisition and product generation, that is, from cradle to gate process, without considering product use and product waste disposal. The production process includes simple process flow and process technology information.

[0036] S2. Establish a process flow model based on the target product production process.

[0037] As a preferred solution of this embodiment, the specific process includes: Based on the entire production process of petrochemical products, the material input and output of the process units and the sequence of the process units are determined and associated to build a petrochemical product process model.

[0038] Specifically, this embodiment determines the material input and output of each process unit according to the process flow, including key raw materials, indirect auxiliary materials, public works, direct emissions and three waste emissions, etc. Arrows or lines are used to represent material flows or energy flows, and each process unit is connected in sequence to form a process path, thereby constructing a process flow model for petrochemical products.

[0039] S3. Analyze the process flow model and divide it into several modules.

[0040] As a preferred solution of this embodiment, the process flow model is divided into modules based on the data integrity of the device input and output, and a number of modules are obtained after the division, and the minimum scale of the module is the device level.

[0041] In actual production, not every process unit can be counted for complete inventory data for carbon footprint accounting. Therefore, it is necessary to modularize the process flow to ensure that the final output product of each accounting module is traceable. Steps for module division: First, for devices without product output, treat them as intermediate processes and determine whether they need to be merged with upstream devices. Secondly, during the merging process, the material input and direct emission data of all upstream devices are included in the device with final product output. The merged module only needs to retain the final input and output data. Finally, for devices with missing data, they are packaged as a whole according to the existing available data and calculated as a separate module. When the data collection mechanism is improved, the modules can be further split and refined to improve the accuracy and resolution of the accounting. Reasonable division of modules can simplify the data collection and model building process, and avoid the difficulty in calculating the carbon footprint of recycled materials and multiple products due to complex processes.

[0042] S4. The module is based on the system boundary to obtain material data related to carbon footprint.

[0043] Based on the modularization results, each module is taken as the research object, and the corresponding items involving carbon footprint substances and their parameters are obtained according to the definition of the system boundary. Specifically, it includes module input and output data, namely direct raw materials, indirect auxiliary materials, public works, transportation emissions, three waste emissions, direct greenhouse gas emissions, etc. to obtain substances related to carbon footprint. The data is obtained in the form of a table, and the data items include products, direct raw materials, indirect auxiliary materials, public works, transportation, wastewater, waste gas, solid waste, specifically the name, quantity, carbon footprint coefficient, transportation carbon footprint coefficient, etc. of each item. Based on the specific division of the system boundary, the data of each item is obtained, among which the data of energy consumption of various materials, transportation, and three waste emissions come from the actual production of the enterprise, and the carbon footprint coefficients corresponding to various materials and energy come from the background database.

[0044] S5. Based on product life cycle assessment, establish a modular product carbon footprint accounting model.

[0045] The greenhouse gases generated in the production process of petrochemical products are calculated by life cycle assessment, and other greenhouse gases are converted into carbon dioxide equivalent (CO2-eq). The carbon footprint of products is calculated by mass allocation and cyclic iteration principles. The carbon footprint accounting model of each module is the sum of the carbon footprint of raw materials and auxiliary materials, the carbon footprint of public works, the carbon footprint of direct greenhouse gas emissions, the carbon footprint of transportation, and the carbon footprint of three waste emissions. The specific calculation formula is: GHG=GHG M + GHG E + GHG T + GHG D + GHG W Among them, GHG represents the carbon footprint of the module's product production process, kgCO2-eq / ton, GHG M The carbon footprint of raw materials and auxiliary materials is the carbon emissions from the production of raw materials and auxiliary materials required in the production process. E The carbon footprint of utilities is the carbon emissions from utilities required in the production process. T The transportation carbon footprint refers to the carbon emissions generated by the transportation of raw materials and auxiliary materials required for the production process. D Indicates the carbon footprint of direct greenhouse gas emissions, that is, direct greenhouse gas emissions during the production process, GHG W The carbon footprint of three-waste emissions refers to the carbon emissions from the disposal of three-waste during the generation process.

[0046] The carbon footprint of raw materials and auxiliary materials is calculated as: the sum of the product of the mass of each material consumed in the process and the corresponding carbon footprint factor, the sum of the product of the carbon footprint of each recycled material and the mass of the corresponding recycled material, and the quotient of the sum of the mass of all products in the module. Specifically, the carbon footprint of raw materials and auxiliary materials is the greenhouse gas emissions generated by the direct raw materials and indirect auxiliary materials consumed in the process of producing each ton of product in the module at their respective production stages. The calculation formula is as follows: GHG M =(∑ i m i k i +∑ j GHG j m j ) / ∑ n m n Among them, m i Indicates the mass of raw materials and auxiliary materials, tons, k i represents the carbon footprint factor of raw materials, kgCO2-eq / ton, i represents the type of raw materials, m n represents the mass of the module product, tons, n represents the type of product, GHG j represents the carbon footprint of recycled materials, kgCO2-eq / ton, and j represents the type of recycled materials.

[0047] In actual calculation, the initial value can be assumed to perform cyclic iterative calculation. When the error between the calculation result and the iterative result does not meet the requirement, the current calculation result is used as the initial value of the iteration and the iterative calculation is continued until the error between two consecutive iterative results meets the requirement and the calculation is stopped, that is, the error is less than 0.1%. The calculated value at which the iteration is stopped is the carbon footprint of the module product.

[0048] The carbon footprint of utilities is calculated as: the product of the consumption of each utility and the corresponding carbon footprint factor and the sum of the mass of all products of the module. Specifically, the carbon footprint of utilities is the greenhouse gas emissions generated by the consumption of utilities in each generation stage during the production of each ton of product by the module. The calculation formula is as follows: GHG E =∑ e E e k e / ∑ n m n Among them, E e represents the consumption of public works, k e It represents the carbon footprint factor corresponding to the public works, kgCO2-eq / ton, and e represents the type of public works.

[0049] The calculation of the transport carbon footprint is: the quotient of the product of the transport mass, the transport distance and the transport carbon footprint factor and the sum of the mass of all products in the module. Specifically, the transport emission carbon footprint is the greenhouse gas emissions generated during the transportation of the raw and auxiliary materials used in the production of each ton of product in the module. The calculation formula is as follows: GHG E =(W*H*k t ) / ∑ n m n Where W represents the transport mass, tons, and H represents the transport distance, kilometers, k t It represents the transport carbon footprint factor, kgCO2-eq / ton-km.

[0050] The carbon footprint of direct greenhouse gas emissions is calculated as: the quotient of the direct greenhouse gas emissions and the sum of the mass of all products of the module. Specifically, the carbon footprint of direct greenhouse gas emissions is the direct greenhouse gas emissions during the production of each ton of product by the module. The calculation formula is as follows: GHG D = GHG1 / ∑ n m n Among them, GHG1 represents direct emissions from the production process, kgCO2-eq / ton.

[0051] The carbon footprint of three wastes is calculated as: the sum of the product of the mass of each waste and the corresponding waste treatment carbon footprint factor and the sum of the mass of all products in the module. Specifically, the carbon footprint of three wastes is the greenhouse gas carbon emissions generated by the disposal activities of the three wastes in the process of producing each ton of product in the module. The calculation formula is as follows: GHG W = ∑ y m y k y / ∑ n m n Among them, m y Indicates waste mass, tons, k y It represents the carbon footprint factor of waste treatment, kgCO2-eq / ton.

[0052] S6. Calculate the carbon footprint of petrochemical products according to the carbon footprint accounting model of each product, and analyze the results of the carbon footprint of petrochemical products.

[0053] The carbon footprint of each module is calculated according to the carbon footprint accounting model of each product, and the carbon footprint of the final petrochemical product is obtained by combining the relationship between each module. The main sources of carbon emissions in the production process of petrochemical products are evaluated by calculating the carbon footprint contribution value of each input and output item in each module.

[0054] The carbon footprint contribution value is calculated by calculating the proportion of each input and output item in each module in the total carbon footprint of petrochemical products. The results can be analyzed from different scales, including product carbon footprint result analysis, result analysis of different modules, and result analysis of different databases. And according to the analysis results, carbon emissions of major carbon emission projects can be optimized.

[0055] This embodiment also discloses a petrochemical product life cycle carbon footprint accounting tool for implementing the above method, the system comprising: Input unit, input basic product information and material data; A target determination unit determines the target product and system boundaries based on the input data; The process generation unit establishes a process model according to the target product production process; Module division unit, which divides the process model into several modules based on the data integrity of the device input and output, and the minimum scale of the module is the device level; The model generation unit, based on the product life cycle assessment, establishes the product carbon footprint accounting model of each module according to the system boundary; The result analysis unit calculates the carbon footprint of petrochemical products according to the carbon footprint accounting model of each product and conducts result analysis on the carbon footprint of petrochemical products.

[0056] Specifically, the input unit inputs basic product information. Basic data includes product name, industry, functional unit, system boundary, production process, process raw materials, geographical location, accounting cycle, etc. The system boundary is a simple description of the product carbon footprint accounting scope, such as the production process. The production process includes simple process flow and process technology information. The input unit inputs data related to carbon footprint substances. After modularization, various data tables related to carbon footprint substances are formed based on the system boundary. The data table items include products, direct raw materials, indirect auxiliary materials, public works, transportation, wastewater, waste gas, solid waste, specifically the name, quantity, carbon footprint coefficient, transportation carbon footprint coefficient, etc.

[0057] The target determination unit determines the target product for carbon footprint accounting based on the product name. Based on the life cycle assessment method, the input and output within the system boundary are determined, where the input includes direct raw materials, indirect auxiliary materials and public works, and the output includes transportation emissions, three waste emissions, and direct greenhouse gas emissions. Among them, public works are specifically the energy consumed in the production process of products, including electricity, water, wind and gas energy, and the three waste emissions are the disposal emissions of wastewater, waste gas, and waste. For petrochemical products, the system boundary of the study includes raw material acquisition and product generation, that is, the process from cradle to gate, without considering product use and product waste disposal.

[0058] Embodiment 2: This embodiment discloses a method for calculating the carbon footprint of a petrochemical product life cycle. The steps are described below using a specific example. Taking PX (P-xylene, paraxylene) product as an example, the method includes the following steps: S1. Determine the target product and system boundaries.

[0059] Determine the target product and system boundaries based on the input product basic data. The input basic data includes Product Name: Para-Xylene; System boundaries: production process; Process flow: Hydrogenated naphtha undergoes reforming, disproportionation, isomerization and separation to produce PX products and their by-products; Process technology: Continuous reforming: UOPCycleMax ultra-low pressure continuous reforming technology; Aromatic extraction: Sinopec sulfolane extraction and distillation process; Disproportionation and alkylation: UOP Tatory technology; Isomerization: UOP ethylbenzene dealkylation technology; Adsorption separation: UOP simulated moving bed adsorption.

[0060] As well as information such as process raw materials, geographical location, calculation cycle, etc.

[0061] Therefore, the target product is determined as PX based on the basic information, and the system boundary is determined based on the production process.

[0062] S2. Establish a process flow model based on the target product production process.

[0063] Clarify the scope of the process flow based on the system boundaries and determine the starting and end points.

[0064] For example, the scope of PX production from residual oil is from the time when the residual oil reaches the vacuum distillation unit, which is the starting point, to the output of PX products, which is the end point.

[0065] Obtain the entire process information of petrochemical products, including information on input and output flows, production processes, and equipment. For example, naphtha produces PX using ultra-low pressure continuous reforming technology. By subjecting naphtha to hydrodealkylation, aromatization and other reactions, it produces high-octane gasoline and aromatics, and produces hydrogen as a by-product. The key links in the process include feed preparation, reforming reaction, product separation and catalyst regeneration. The process flow specifically includes: pretreatment, reforming reaction, catalyst regeneration, aromatics fractionation, disproportionation and alkylation, isomerization, adsorption separation, and aromatics extraction. Based on the above information, according to each process flow, determine the input and output of each unit to determine the process unit materials. The process unit units and the materials determined by input and output are shown in Table 1 below:

[0066] Table 1 According to the connection and sequence between the process units, they are associated, and arrows or lines are used to represent material flow or energy flow. The process units are connected in sequence to form a process path and build a process flow model for petrochemical products.

[0067] S3. Analyze the process flow model and divide it into several modules.

[0068] The process units of the process flow model are divided based on the data integrity of the device input and output, and multiple modules are obtained after division. In the process flow of PX, the pretreatment unit, reforming reaction unit, and catalyst regeneration unit are a complete product input and output process. In addition, the electricity, water, and air used by the three units of the pretreatment unit, reforming reaction unit, and catalyst regeneration unit cannot be separated. The five units of aromatics fractionation, aromatics extraction, disproportionation and alkylation, isomerization, and adsorption separation are a complete product input and output process. In addition, the reflux materials between the five units of aromatics fractionation, aromatics extraction, disproportionation and alkylation, isomerization, and adsorption separation cannot be counted, so they are merged and modularized respectively, and finally divided into two modules, which are defined as continuous reforming module and PX production module respectively.

[0069] S4. The module is based on the system boundary to obtain material data related to carbon footprint.

[0070] Based on the modularization results, each module is taken as the research object, and the corresponding items involving carbon footprint substances and their parameters are obtained according to the definition of system boundaries. Specifically, the data items of each module include products, direct raw materials, indirect auxiliary materials, public works, transportation, wastewater, waste gas, and solid waste. According to the above-mentioned merged process units, the data of the corresponding items are obtained respectively. For example, for the continuous reforming module, the material data is obtained as shown in Table 2:

[0071] Table 2 S5. Based on product life cycle assessment, establish a modular product carbon footprint accounting model.

[0072] The specific formula is: GHG=GHG M + GHG E + GHG T + GHG D + GHG W Among them, GHG represents the carbon footprint of the module's product production process, kgCO2-eq / ton, GHG M The carbon footprint of raw materials and auxiliary materials is the carbon emissions from the production of raw materials and auxiliary materials required in the production process. E The carbon footprint of utilities is the carbon emissions from utilities required in the production process. T The transportation carbon footprint refers to the carbon emissions generated by the transportation of raw materials and auxiliary materials required for the production process. D Indicates the carbon footprint of direct greenhouse gas emissions, that is, direct greenhouse gas emissions during the production process, GHG W The carbon footprint of three-waste emissions refers to the carbon emissions from the disposal of three-waste during the generation process.

[0073] The carbon footprint of raw materials and auxiliary materials is calculated as: GHG M =(∑ i m i k i +∑ j GHG j m j ) / ∑ n m n .

[0074] The carbon footprint of utilities is calculated as: GHG E =∑ e E e k e / ∑ n m n .

[0075] The calculation of the transport carbon footprint is: GHG E =(W*H*k t ) / ∑ n m n .

[0076] The carbon footprint of direct greenhouse gas emissions is calculated as: GHG D = GHG1 / ∑ n m n .

[0077] The carbon footprint of three waste emissions is calculated as: GHG W = ∑ y m y k y / ∑ n m n .

[0078] S6. Calculate the carbon footprint of petrochemical products according to the carbon footprint accounting model of each product, and analyze the results of the carbon footprint of petrochemical products.

[0079] The carbon footprint of each module is calculated according to the product carbon footprint accounting model of each module, and the carbon footprint of the final petrochemical product is obtained by combining the relationship between each module. The main sources of carbon emissions in the production process of petrochemical products are evaluated by calculating the carbon footprint contribution value of each input and output item in each module. The carbon footprint contribution value is calculated by calculating the proportion of each input and output item in each module in the total carbon footprint of petrochemical products.

[0080] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A method for calculating the carbon footprint of a petrochemical product life cycle, characterized in that: The following steps are involved: Determine the target product and system boundaries, and establish a process model based on the target product production process; Divide the process equipment of the process flow model into several modules based on the data integrity of the equipment input and output; Conduct inventory analysis on the modules to obtain material data related to carbon footprint; Establish a modular product carbon footprint accounting model based on the life cycle assessment method; According to the carbon footprint accounting model of each product, the carbon footprint of petrochemical products is calculated and the results are analyzed.

2. The method for calculating the carbon footprint of a petrochemical product life cycle according to claim 1 is characterized in that: Based on the life cycle assessment method, the target products for accounting are determined, and the inputs and outputs within the boundaries of the research system are determined. The inputs include direct raw materials, indirect auxiliary materials and public works, and the outputs include transportation emissions, three waste emissions, and direct greenhouse gas emissions.

3. The method for calculating the carbon footprint of a petrochemical product life cycle according to claim 1 is characterized in that: The process flow model is established, specifically including: Based on the entire production process of petrochemical products, the material input and output of the process units are determined, and the sequence of the process units is associated to build a petrochemical product process model.

4. A petrochemical product life cycle carbon footprint accounting method according to claim 1, 2 or 3, characterized in that: The analysis of the process flow model is divided into several modules, including: The smallest module size is the device level.

5. A petrochemical product life cycle carbon footprint accounting method according to claim 4, characterized in that the module The product carbon footprint accounting model is the sum of the carbon footprint of raw materials and auxiliary materials, the carbon footprint of public works, the carbon footprint of direct greenhouse gas emissions, the carbon footprint of transportation, and the carbon footprint of three waste emissions.

6. A petrochemical product life cycle carbon footprint accounting method according to claim 5, characterized in that: The carbon footprint of raw and auxiliary materials is calculated as: the sum of the products of the mass of each material consumed in the process and the corresponding carbon footprint factor, the sum of the products of the carbon footprint of each recycled material and the mass of the corresponding recycled material, and the quotient of the total mass of all products of the module.

7. The method for calculating the carbon footprint of a petrochemical product life cycle according to claim 5 is characterized in that: The utility carbon footprint is calculated as: the quotient of the sum of the products of the utility consumption and the corresponding carbon footprint factor and the sum of the mass of all products of the module; The calculation of the transport carbon footprint is: the quotient of the product of the transport mass, the transport distance and the transport carbon footprint factor and the total mass of all products in the module.

8. The method for calculating the carbon footprint of a petrochemical product life cycle according to claim 5 is characterized in that: The carbon footprint of direct greenhouse gas emissions is calculated as the quotient of the direct greenhouse gas emissions and the total mass of all products of the module.

9. The method for calculating the carbon footprint of a petrochemical product life cycle according to claim 5 is characterized in that: The carbon footprint of the three waste emissions is calculated as: the quotient of the sum of the product of the mass of each waste and the corresponding waste treatment carbon footprint factor and the sum of the mass of all products of the module.

10. A petrochemical product life cycle carbon footprint accounting tool, implementing the method described in any one of claims 1 to 9, characterized in that: include, Input unit, input basic product information and material data; A target determination unit determines the target product and system boundaries based on the input data; The process generation unit establishes a process model according to the target product production process; Module division unit, which divides the process model into several modules based on the data integrity of the device input and output, and the minimum scale of the module is the device level; The model generation unit, based on the product life cycle assessment, establishes the product carbon footprint accounting model of each module according to the system boundary; The result analysis unit calculates the carbon footprint of petrochemical products according to the carbon footprint accounting model of each product and conducts result analysis on the carbon footprint of petrochemical products.

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