Rectification process carbon emission reduction optimization method based on carbon footprint evaluation

Abstract

The invention discloses a rectification process carbon emission reduction optimization method based on carbon footprint evaluation, and solves the problems that the existing carbon emission reduction optimization mainly focuses on the intelligent optimization design of a rectification tower and the optimization design of a process and is lack of carbon footprint evaluation and carbon emission reduction optimization of the whole life cycle of the rectification process. The method comprises the following steps: determining a functional unit and a system boundary of rectification process carbon footprint evaluation; analyzing the rectification process according to greenhouse gas emission, and obtaining substances and energy related to carbon footprints; based on life cycle evaluation, establishing a rectification process carbon footprint evaluation model; and calculating the carbon footprint in the rectification process according to the model, analyzing the contribution rate of the carbon footprint in the rectification process, and determining a main carbon emission source to carry out corresponding carbon emission reduction optimization. According to the method, the carbon footprint is checked from the aspect of whole life cycle evaluation of the rectification process, the carbon footprint of the rectification process is accurately evaluated, a reference is provided for subsequent carbon footprint optimization, and a carbon emission reduction optimization scheme is better proposed.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission, and in particular to a method for optimizing carbon emission reduction in a distillation process based on carbon footprint assessment. Background Art

[0002] In recent years, climate change problems caused by excessive greenhouse gas emissions have become more and more serious, and carbon footprint evaluation and carbon emission reduction optimization have become hot topics in various industries. Distillation, as the most common unit operation process, is widely used in the separation of mixtures in the petrochemical industry. Distillation is an operation that uses the difference in volatility of each component in a mixture to achieve high-purity separation of components. The process consumes a lot of energy and indirectly produces a large amount of greenhouse gas emissions. Current research mainly focuses on the intelligent optimization design of distillation towers and the optimization design of processes. There is a lack of carbon footprint assessment and carbon emission reduction optimization for the distillation process throughout its life cycle. Therefore, it is necessary to use a full life cycle assessment method to quantify the carbon footprint of the distillation process and propose feasible carbon emission reduction optimization methods to reduce process carbon emissions. Summary of the invention

[0003] The present invention mainly solves the problem that the existing carbon emission reduction optimization mainly focuses on the intelligent optimization design of distillation towers and the optimization design of processes, and lacks carbon footprint assessment and carbon emission reduction optimization for the entire life cycle of the distillation process, and provides a carbon emission reduction optimization method for the distillation process based on carbon footprint assessment.

[0004] The above technical problem of the present invention is mainly solved by the following technical solution: A method for optimizing carbon emission reduction in a distillation process based on carbon footprint assessment, comprising the following steps: S1. Determine the functional units and system boundaries for carbon footprint assessment of distillation process; S2. Analyze the distillation process based on greenhouse gas emissions to obtain the materials and energy involved in the carbon footprint; S3. Based on the life cycle assessment, a carbon footprint assessment model for the distillation process is established according to the substances and energy; S4. Calculate the carbon footprint of the distillation process based on the model, analyze the carbon footprint contribution rate of the distillation process, and determine the main sources of carbon emissions to optimize corresponding carbon emission reduction.

[0005] The present invention calculates the carbon footprint from the perspective of the full life cycle evaluation of the distillation process, accurately evaluates the carbon footprint of the distillation process, provides a benchmark for subsequent carbon footprint optimization, and better proposes a carbon emission reduction optimization plan. The present invention uses a full life cycle evaluation method to quantify the carbon footprint of the distillation process, and proposes a feasible carbon footprint optimization method according to the carbon footprint source analysis, and accurately realizes the carbon emission reduction optimization of the distillation process. The present invention uses a full life cycle evaluation method to evaluate the carbon footprint of the distillation process, and performs corresponding carbon emission reduction optimization based on the evaluation. It can realize carbon footprint evaluation and carbon emission reduction optimization of different types of distillation processes, provide support for low-carbon research in the petrochemical industry, and help achieve carbon neutrality goals.

[0006] As a preferred solution, step S1 specifically includes: The functional unit for carbon footprint assessment is determined based on greenhouse gas emissions per unit ton of raw materials processed; The distillation process is divided into the production process, operation process and waste treatment process of the equipment to determine the system boundary of the carbon footprint assessment.

[0007] The functional unit for determining the carbon footprint assessment of the distillation process is the greenhouse gas emissions generated per ton of raw materials processed. The distillation process equipment includes distillation towers, reboilers, condensers, and pumps. The system boundary is the production process, operation process, and waste treatment process of distillation towers, reboilers, condensers, and pumps in the distillation process.

[0008] As a preferred solution, step S2 specifically includes: Determine the raw materials involved in the carbon footprint based on the greenhouse gas emissions generated by the raw materials consumed by equipment during the production process; Determine the substances and energy involved in the carbon footprint based on the greenhouse gas emissions generated by the substances and energy required for the operation of the equipment during operation; Determine the waste involved in the carbon footprint based on the greenhouse gas emissions generated by the waste treatment process equipment.

[0009] The equipment in the distillation process includes distillation towers, reboilers, condensers, and pumps. A data list analysis is conducted on the distillation process. During the production process of each distillation equipment, the greenhouse gas emissions generated by the raw materials required for the production of each equipment are considered, including the raw materials consumed in the production process of distillation towers, reboilers, condensers, and pumps. The three types of equipment are mainly made of metal. For example, the most commonly used material is carbon steel, so it is determined that the raw material involved in the carbon footprint is carbon steel. The operation process considers the greenhouse gas emissions generated by the consumption of utilities such as electricity required for pumps, steam required for reboilers, and circulating water required for condensers, as well as the greenhouse gases substituted by raw material liquid, so it is determined that the materials and energy involved in the carbon footprint are electricity, steam, circulating water, and raw material liquid. The waste treatment process considers the greenhouse gas emissions generated by the waste treatment process of abandoned distillation towers, abandoned reboilers, abandoned condensers, and abandoned pumps. For example, if the above raw materials are carbon steel, the waste involved in the carbon footprint is determined to be abandoned carbon steel. By analyzing the inventory data, we can find out the consumption of raw materials required for the production of distillation towers, reboilers, condensers and pumps in the production process; the consumption of electricity, steam, circulating water and raw material liquid in the operation process; and the treatment volume of various wastes in the waste treatment process.

[0010] As a preferred solution, the substances and energy involved in the carbon footprint are obtained, and the carbon footprint factors corresponding to the substances and energy are obtained at the same time.

[0011] Each substance and energy has its corresponding carbon footprint factor. After obtaining the substances and energy involved in carbon footprint according to the production, operation and waste treatment process of the whole life cycle of distillation, the carbon footprint factors corresponding to these substances and energy are obtained at the same time. For example, the inventory data includes the consumption of raw materials required for the production of distillation towers, reboilers, condensers and pumps in the production process, as well as the carbon footprint factors of raw materials, the consumption of electricity, steam, circulating water and raw material liquid in the operation process, as well as the carbon footprint factors corresponding to the three energy sources and raw material liquid, and the treatment amount of various wastes in the waste treatment process and their corresponding carbon footprint factors.

[0012] As a preferred solution, a carbon footprint assessment model for the distillation process is established, which is the sum of the carbon footprint of the production process, the carbon footprint of the operation process, and the carbon footprint of the waste treatment process.

[0013] The carbon footprint of the production process, the carbon footprint of the operation process, and the carbon footprint of the waste treatment process are set, and the three are added together to form the carbon footprint of the raw materials processed by the distillation process. According to the functional units set above, the model is set as the carbon footprint of each processing unit ton of the distillation process, that is, one ton of raw materials.

[0014] The specific formula of the carbon footprint model of the distillation process is as follows: CFP=CFP P +CFP O +CFP W Where CFP (kgCO2-eq / ton) is the carbon footprint of the distillation process per ton of raw material processed. P (kgCO2-eq / ton) is the carbon footprint of the production process, CFP O (kgCO2-eq / ton) is the carbon footprint of the operation process, CFP W (kgCO2-eq / ton) is the carbon footprint of the waste treatment process.

[0015] As a preferred scheme, the carbon footprint of the production process is the sum of the product of the consumption of various raw materials and the corresponding carbon footprint factor, and the quotient of the raw material liquid processing volume during the operation process, wherein the raw material liquid processing volume during the operation process is the product of the raw material liquid flow rate, annual operating time, equipment life, and parameters.

[0016] The carbon footprint of the production process is expressed as follows: CFP P =∑ x (m x *k x ) / A Among them, x is the type of raw materials in the production process, m x (kg) is the consumption of each raw material, k x (kgCO2-eq / kg) is the carbon footprint factor corresponding to each raw material.

[0017] The raw liquid processing volume during the entire life cycle of the distillation process satisfies the following formula: A=F1*T*n*0.001 Among them, A (ton) is the processing capacity of raw material liquid during operation, F1 (kg / h) is the flow rate, T (hour) is the annual operation time, and n (year) is the equipment life.

[0018] The distillation tower height, tower mass, reboiler mass and condenser mass satisfy the following formula: z=(N / E1-1)S mt=z*h*a mr=1000*Qr*b*p2 / (T2-T1)K mc=1000*Qc*b*p2 / (T3-T1)K Wherein, z(m) is the height of the distillation tower, N is the number of plates, E1 is the efficiency of the whole tower, S(m) is the distance between plates, a is the tower mass conversion factor, mt(kg) is the mass of the distillation tower, mr(kg) is the mass of the reboiler, Qr(kW) is the reboiler load, T1(℃) is the feed temperature of the raw liquid, T2(℃) is the outlet temperature of the reboiler, T3(℃) is the outlet temperature of the condenser, K(w / m 2 ℃) is the heat transfer coefficient, b(m) is the thickness of the heat exchanger, p2(kg / m 3) is the density of carbon steel, Qc (kW) is the condenser load, and mc (kg) is the condenser mass.

[0019] As a preferred scheme, the carbon footprint of the operation process is the sum of the product of the raw liquid flow rate and the raw liquid carbon footprint factor, the product of the electricity consumption and the electricity carbon footprint factor, the product of the steam consumption and the steam carbon footprint factor, the product of the circulating water consumption and the circulating water carbon footprint factor, and the quotient of the raw liquid processing volume during the operation process.

[0020] The carbon footprint of the corresponding operation process is expressed as follows: CFP O = (Ak O +Ek E +Z S k Z +H W k H ) / A Among them, k O (kgCO2-eq / kg) is the carbon footprint factor of the raw material liquid, E (kWh) is the power consumption of the operation process, k E (kgCO2-eq / kg) is the carbon footprint factor of electricity, Z S (kg) is the steam consumption, k Z (kgCO2-eq / kg) is the carbon footprint factor of steam, H W (kg) is the circulating water consumption, k H (kgCO2-eq / kg) is the carbon footprint factor of the circulating water.

[0021] The formulas for steam consumption, circulating water consumption, and power consumption during operation are as follows: Z S =Qr*T*3600 / r H W =Qc*T*3600 / CpΔt E=F2*p1*g*H*E2*T*n / (3600*1000) Among them, F2(m 3 / h) is the pump flow rate, p1 (kg / m 3 ) is the density of the raw liquid, E2 is the pump efficiency, H (m) is the pump head, r (J / kg) is the specific heat of vaporization of steam, C P (J / kg℃) is the specific heat capacity of water, and Δt (℃) is the temperature difference between the inlet and outlet of the circulating water.

[0022] As a preferred solution, the carbon footprint of the waste treatment process is the sum of the product of the treatment amount of each waste material in the waste treatment process and its corresponding carbon footprint factor, and the quotient of the treatment amount of the raw material liquid in the operation process.

[0023] The carbon footprint of the waste treatment process is expressed as follows: CFP W =∑ y (m y *k y ) / A Among them, y is the type of waste, m y (kg) is the mass of each type of waste, k y (kgCO2-eq / kg) is the carbon footprint factor for each waste treatment.

[0024] As a preferred solution, the analysis of the carbon footprint contribution rate of the distillation process specifically includes: The proportion of the carbon footprint of the production process, operation process and waste treatment process in the carbon footprint of the distillation process is calculated respectively, and the contribution rate of the carbon footprint of the production process, operation process and waste treatment process is obtained.

[0025] After establishing the carbon footprint model of the distillation process, the relevant parameters of the distillation process are substituted into the model for calculation to obtain the carbon footprint of the distillation process. At the same time, the carbon footprints of the production process, operation process and waste treatment process can be calculated. By calculating the percentage of the carbon footprint of the production process, operation process and waste treatment process in the carbon footprint of the distillation process, the carbon footprint contribution rates of the production process, operation process and waste treatment process are used as the contribution rates, and the corresponding carbon reduction optimization operations are performed based on the comparison of the contribution rates.

[0026] As a preferred solution, the determination of the main carbon emission sources to optimize the corresponding carbon emission reduction specifically includes: The contribution rates of each distillation process are sorted by size, and the process with the largest contribution rate is determined as the main source of carbon emissions. The sources of carbon footprint involved in this process are then optimized for carbon emission reduction.

[0027] Therefore, the advantages of the present invention are: 1. The carbon footprint of the distillation process is calculated from the perspective of the entire life cycle evaluation, and the carbon footprint of the distillation process is accurately assessed, which provides a benchmark for subsequent carbon footprint optimization and better proposes carbon emission reduction optimization plans.

[0028] 2. Use the full life cycle assessment method to quantify the carbon footprint of the distillation process, and propose a feasible carbon footprint optimization method based on the carbon footprint source analysis to accurately achieve carbon emission reduction optimization in the distillation process.

[0029] 3. The carbon footprint of the distillation process is evaluated using the full life cycle assessment method, and corresponding carbon emission reduction optimization is performed based on the evaluation. This can achieve carbon footprint evaluation and carbon emission reduction optimization for different types of distillation processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a schematic diagram of a process of the present invention. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0032] Embodiment 1: This embodiment provides a method for optimizing carbon emission reduction in a distillation process based on carbon footprint assessment. Figure 1 As shown, the following steps are included: S1. Determine the functional units and system boundaries for carbon footprint assessment of distillation process.

[0033] As a preferred solution of this embodiment, the functional units and system boundaries of the carbon footprint assessment of the distillation process are first determined.

[0034] The functional unit of carbon footprint assessment is determined according to the greenhouse gas emissions generated per unit ton of raw materials processed. In this embodiment, the functional unit of carbon footprint assessment is determined as the greenhouse gas emissions generated per ton of raw materials processed. The distillation process equipment includes a distillation tower, a reboiler, a condenser, and a pump.

[0035] The distillation process is divided into the production process, operation process and waste treatment process of the equipment to determine the system boundary of the carbon footprint assessment. Specifically, the production process, operation process and waste treatment process of the distillation tower, reboiler, condenser and pump in the distillation process are determined as the system boundary.

[0036] S2. Analyze the distillation process according to greenhouse gas emissions to obtain the substances and energy involved in the carbon footprint.

[0037] As a preferred solution of this embodiment, the inventory data of the distillation process is analyzed, and the raw materials involved in the carbon footprint are determined based on the greenhouse gas emissions generated by the raw materials consumed by the equipment during the production process. In the production process of each distillation equipment, the greenhouse gas emissions generated by the raw materials required for the production of each equipment are considered, including the raw materials consumed in the production process of the distillation tower, reboiler, condenser and pump. The three types of equipment are mainly made of metal, for example, the most commonly used material is carbon steel. According to this example, it can be determined that the raw material involved in the carbon footprint is carbon steel.

[0038] The materials and energy involved in the carbon footprint are determined based on the greenhouse gas emissions generated by the materials and energy required for equipment operation during operation. The greenhouse gas emissions generated by the consumption of utilities such as electricity required for pumps, steam required for reboilers, and circulating water required for condensers, as well as the greenhouse gases substituted by the raw liquid, are considered during the operation process. The materials and energy involved in the carbon footprint are determined to be electricity, steam, circulating water, and raw liquid.

[0039] The waste involved in the carbon footprint is determined based on the greenhouse gas emissions generated by the waste treatment process equipment. The waste treatment process considers the greenhouse gas emissions generated by the waste distillation tower, waste reboiler, waste condenser and waste pump waste treatment process. For example, if the above raw materials are carbon steel, the waste with carbon footprint is determined to be waste carbon steel.

[0040] By analyzing the inventory data, we can find out the consumption of raw materials required for the production of distillation towers, reboilers, condensers and pumps in the production process; the consumption of electricity, steam, circulating water and raw material liquid in the operation process; and the treatment volume of various wastes in the waste treatment process.

[0041] Obtain the substances and energy involved in carbon footprint, and obtain the carbon footprint factors corresponding to the substances and energy. Each substance and energy has its corresponding carbon footprint factor. After obtaining the substances and energy involved in carbon footprint according to the production, operation, and waste treatment processes of the entire life cycle of distillation, obtain the carbon footprint factors corresponding to these substances and energy at the same time. For example, the inventory data includes the consumption of raw materials required for the production of distillation towers, reboilers, condensers, and pumps in the production process, as well as the carbon footprint factors of raw materials, the consumption of electricity, steam, circulating water, and raw material liquid in the operation process, as well as the carbon footprint factors corresponding to the three energy sources and raw material liquid, and the treatment volume of various wastes in the waste treatment process and their corresponding carbon footprint factors.

[0042] S3. Based on life cycle assessment, a carbon footprint assessment model for the distillation process is established according to the substances and energy.

[0043] As a preferred solution of this embodiment, a carbon footprint assessment model for the distillation process is established, and the model is the sum of the carbon footprint of the production process, the carbon footprint of the operation process, and the carbon footprint of the waste treatment process.

[0044] In the process of establishing the carbon footprint assessment model of the distillation process, the carbon footprint formulas of the production process, the operation process, and the waste treatment process are first established according to the distillation process, and then the three are added together to form the carbon footprint of the raw materials processed by the distillation process. According to the functional units set above, the model is set as the carbon footprint of each processing unit ton of the distillation process, that is, one ton of raw materials.

[0045] Specifically, the carbon footprint of the production process is the sum of the product of the consumption of various raw materials and the corresponding carbon footprint factor, and the quotient of the raw material liquid processing volume during the operation process, where the raw material liquid processing volume during the operation process is the product of the raw material liquid flow rate, annual operating time, equipment life, and parameters.

[0046] Correspondingly, the carbon footprint of the operation process is the sum of the product of the raw liquid flow rate and the raw liquid carbon footprint factor, the product of the electricity consumption and the electricity carbon footprint factor, the product of the steam consumption and the steam carbon footprint factor, the product of the circulating water consumption and the circulating water carbon footprint factor, and the quotient of the raw liquid processing volume during the operation process.

[0047] And the carbon footprint of the waste treatment process is the sum of the product of the amount of each waste material treated in the waste treatment process and its corresponding carbon footprint factor, and the quotient of the amount of raw liquid treated in the operation process.

[0048] After establishing the carbon footprint model of the distillation process, the relevant parameters of the distillation process are substituted into the model for calculation to obtain the carbon footprint of the distillation process. The relevant parameters are the parameters required for calculating the carbon footprint of each equipment in the production, operation, and waste treatment processes of the distillation process. The carbon footprints of the production process, operation process, and waste treatment process are calculated.

[0049] S4. Calculate the carbon footprint of the distillation process based on the model, analyze the carbon footprint contribution rate of the distillation process, and determine the main sources of carbon emissions to optimize corresponding carbon emission reduction.

[0050] As a preferred solution of this embodiment, relevant parameters are brought into the carbon footprint model calculation of the distillation process to obtain the carbon footprint of the distillation process and the carbon footprints of the three processes, and the contribution rate of the production process, the operation process, and the waste treatment process is analyzed based on the above-obtained data. Specifically, the proportion of the carbon footprint of the production process, the operation process, and the waste treatment process in the carbon footprint of the distillation process is calculated respectively, and used as the carbon footprint contribution rate of the production process, the operation process, and the waste treatment process.

[0051] The contribution rate of each process in the distillation process is sorted by size, and the process with the largest contribution rate is determined as the main source of carbon emissions. Carbon emission reduction optimization is performed on the source of carbon footprint involved in the process as the main source of carbon emissions. For example, the carbon footprint contribution rate of the operation process is the highest, so it can be determined that the operation process is the main source of carbon emissions, and the carbon emission reduction optimization is performed on the source of carbon footprint of the operation process. As a scheme of this embodiment, according to the materials and energy required for the operation of the equipment during the operation process, including the power consumption, steam consumption, circulating water consumption, and raw liquid consumption during the operation process, low-carbon raw materials can be selected to replace traditional petrochemical raw materials to reduce the carbon emissions brought in by the raw liquid itself, or power consumption can be selected for carbon emission reduction optimization. Preferably, carbon emission reduction optimization is performed from the perspective of low-carbon electricity, and energy generation is used instead of traditional thermal power generation, which reduces greenhouse gas emissions generated by power consumption during the operation process, thereby reducing carbon emission reduction optimization in a targeted manner. In addition, in addition to the above-mentioned carbon emission reduction optimization strategy for the operation process, carbon emission reduction optimization strategies for production processes and waste treatment processes are also included. As a scheme of this embodiment, for the production and waste processes, most of the equipment such as distillation towers, reboilers, condensers and pumps are made of metal materials. The recycled waste metal materials can be used to offset the raw materials required for the metal production process after processing, thereby reducing the consumption of raw materials in the production process and reducing carbon emissions generated in the production process and waste treatment process.

[0052] Embodiment 2: This embodiment discloses a method for optimizing carbon emission reduction in a distillation process based on carbon footprint assessment. The following is an example of separating a benzene and toluene mixture in a distillation process. It is assumed that the processing capacity of the raw liquid is 500 kg / h, the mass fractions of benzene and toluene are 0.6 and 0.4 respectively, and the recovery rate of the key components at the top of the tower is 0.99. The relevant parameters required for the calculation are shown in Table 1.

[0053]

[0054] Table 1 Related parameters The method specifically comprises the following steps: S1. Determine the functional units and system boundaries for carbon footprint assessment of distillation process.

[0055] As a preferred solution of this embodiment, the functional units and system boundaries of the carbon footprint assessment of the distillation process are first determined.

[0056] The functional unit of carbon footprint assessment is determined according to the greenhouse gas emissions generated per unit ton of raw materials processed. In this embodiment, the functional unit of carbon footprint assessment is determined as the greenhouse gas emissions generated per ton of raw materials processed. The distillation process equipment includes a distillation tower, a reboiler, a condenser, and a pump.

[0057] The distillation process is divided into the production process, operation process and waste treatment process of the equipment to determine the system boundary of the carbon footprint assessment. Specifically, the production process, operation process and waste treatment process of the distillation tower, reboiler, condenser and pump in the distillation process are determined as the system boundary.

[0058] S2. Analyze the distillation process according to greenhouse gas emissions to obtain the substances and energy involved in the carbon footprint.

[0059] As a preferred solution of this embodiment, the inventory data of the distillation process is analyzed, and the raw materials involved in the carbon footprint are determined according to the greenhouse gas emissions generated by the raw materials consumed by the equipment during the production process. In the production process of each distillation equipment, the greenhouse gas emissions generated by the raw materials required for the production of each equipment are considered, including the raw materials consumed in the production process of the distillation tower, reboiler, condenser and pump. The three types of equipment are mainly made of metal. Taking the most commonly used carbon steel material as an example, it can be determined that the raw material involved in the carbon footprint is carbon steel.

[0060] The materials and energy involved in the carbon footprint are determined based on the greenhouse gas emissions generated by the materials and energy required for equipment operation during operation. The greenhouse gas emissions generated by the consumption of utilities such as electricity required for pumps, steam required for reboilers, and circulating water required for condensers, as well as the greenhouse gases substituted by the raw liquid, are considered during the operation process. The materials and energy involved in the carbon footprint are determined to be electricity, steam, circulating water, and raw liquid.

[0061] The waste involved in the carbon footprint is determined based on the greenhouse gas emissions generated by the waste treatment process equipment. The waste treatment process considers the greenhouse gas emissions generated by the waste distillation tower, waste reboiler, waste condenser and waste pump waste treatment process. For example, if the above raw materials are carbon steel, the waste with carbon footprint is determined to be waste carbon steel.

[0062] By analyzing the inventory data, we can find out the consumption of raw materials required for the production of distillation towers, reboilers, condensers and pumps in the production process; the consumption of electricity, steam, circulating water and raw material liquid in the operation process; and the treatment volume of various wastes in the waste treatment process.

[0063] Obtain the substances and energy involved in the carbon footprint, and at the same time obtain the carbon footprint factors corresponding to the substances and energy. Each substance and energy has its corresponding carbon footprint factor. After obtaining the substances and energy involved in the carbon footprint according to the production, operation, and waste treatment processes of the entire life cycle of distillation, obtain the carbon footprint factors corresponding to these substances and energy at the same time. For example, the inventory data includes the consumption of raw materials required for the production of distillation towers, reboilers, condensers, and pumps in the production process, as well as the carbon footprint factors of raw materials, the consumption of electricity, steam, circulating water, and raw material liquid in the operation process, as well as the carbon footprint factors corresponding to the three energy sources and raw material liquid, and the treatment amount of various wastes in the waste treatment process and their corresponding carbon footprint factors. The carbon footprint factors corresponding to the substances and energy of the distillation process are shown in Table 2.

[0064] name <![CDATA[Carbon footprint factor kg CO2-eq]]> Carbon Steel 2.229 electricity 1.043 steam 0.333 Circulating water 0.00034 Raw material liquid 1.191 Waste carbon steel 0.005 Low carbon electricity 0.337 Table 2 Carbon footprint factors of materials and energy S3. Based on life cycle assessment, a carbon footprint assessment model for the distillation process is established according to the substances and energy.

[0065] As a preferred solution of this embodiment, a carbon footprint assessment model for the distillation process is established, and the model is the sum of the carbon footprint of the production process, the carbon footprint of the operation process, and the carbon footprint of the waste treatment process.

[0066] In the process of establishing the carbon footprint assessment model of the distillation process, the carbon footprint formulas of the production process, the operation process, and the waste treatment process are first established according to the distillation process, and then the three are added together to form the carbon footprint of the raw materials processed by the distillation process. According to the functional units set above, the model is set as the carbon footprint of each processing unit ton of the distillation process, that is, one ton of raw materials.

[0067] The specific formula of the carbon footprint model of the distillation process is as follows: CFP=CFP P +CFP O +CFP W Where CFP (kgCO2-eq / ton) is the carbon footprint of the distillation process per ton of raw material processed.P (kgCO2-eq / ton) is the carbon footprint of the production process, CFP O (kgCO2-eq / ton) is the carbon footprint of the operation process, CFP W (kgCO2-eq / ton) is the carbon footprint of the waste treatment process.

[0068] Specifically, the carbon footprint of the production process is the sum of the product of the consumption of various raw materials and the corresponding carbon footprint factor, and the quotient of the raw material liquid processing volume during the operation process, where the raw material liquid processing volume during the operation process is the product of the raw material liquid flow rate, annual operating time, equipment life, and parameters.

[0069] The carbon footprint of the production process is expressed as follows: CFP P =∑ x (m x *k x ) / A Among them, x is the type of raw materials in the production process, m x (kg) is the consumption of each raw material, k x (kgCO2-eq / kg) is the carbon footprint factor corresponding to each raw material.

[0070] The raw liquid processing volume during the entire life cycle of the distillation process satisfies the following formula: A=F1*T*n*0.001 Among them, A (ton) is the processing capacity of raw material liquid during operation, F1 (kg / h) is the flow rate, T (hour) is the annual operation time, and n (year) is the equipment life.

[0071] The distillation tower height, tower mass, reboiler mass and condenser mass satisfy the following formula: z=(N / E1-1)S mt=z*h*a mr=1000*Qr*b*p2 / (T2-T1)K mc=1000*Qc*b*p2 / (T3-T1)K Wherein, z(m) is the height of the distillation tower, N is the number of plates, E1 is the efficiency of the whole tower, S(m) is the distance between plates, a is the tower mass conversion factor, mt(kg) is the mass of the distillation tower, mr(kg) is the mass of the reboiler, Qr(kW) is the reboiler load, T1(℃) is the feed temperature of the raw liquid, T2(℃) is the outlet temperature of the reboiler, T3(℃) is the outlet temperature of the condenser, K(w / m 2 ℃) is the heat transfer coefficient, b(m) is the thickness of the heat exchanger, p2(kg / m 3 ) is the density of carbon steel, Qc (kW) is the condenser load, and mc (kg) is the condenser mass.

[0072] Correspondingly, the carbon footprint of the operation process is the sum of the product of the raw liquid flow rate and the raw liquid carbon footprint factor, the product of the electricity consumption and the electricity carbon footprint factor, the product of the steam consumption and the steam carbon footprint factor, the product of the circulating water consumption and the circulating water carbon footprint factor, and the quotient of the raw liquid processing volume during the operation process.

[0073] The carbon footprint of the operation process is expressed as follows: CFP O = (Ak O +Ek E +Z S k Z +H W k H ) / A Among them, k O (kgCO2-eq / kg) is the carbon footprint factor of the raw material liquid, E (kWh) is the power consumption of the operation process, k E (kgCO2-eq / kg) is the carbon footprint factor of electricity, Z S (kg) is the steam consumption, k Z (kgCO2-eq / kg) is the carbon footprint factor of steam, H W (kg) is the circulating water consumption, k H (kgCO2-eq / kg) is the carbon footprint factor of the circulating water.

[0074] The formulas for steam consumption, circulating water consumption, and power consumption during operation are as follows: Z S =Qr*T*3600 / r H W =Qc*T*3600 / CpΔt E=F2*p1*g*H*E2*T*n / (3600*1000) Among them, F2(m 3 / h) is the pump flow rate, p1 (kg / m 3 ) is the density of the raw material liquid, E2 is the pump efficiency, H(m) is the pump head, g(m / s 2 ) is the gravitational acceleration, r (J / kg) is the specific heat of vaporization of steam, C P (J / kg℃) is the specific heat capacity of water, and Δt (℃) is the temperature difference between the inlet and outlet of the circulating water.

[0075] And the carbon footprint of the waste treatment process is the sum of the product of the amount of each waste material treated in the waste treatment process and its corresponding carbon footprint factor, and the quotient of the amount of raw liquid treated in the operation process.

[0076] The carbon footprint of the waste treatment process is expressed as follows: CFPW =∑ y (m y *k y ) / A Among them, y is the type of waste, m y (kg) is the mass of each type of waste, k y (kgCO2-eq / kg) is the carbon footprint factor for each waste treatment.

[0077] S4. Calculate the carbon footprint of the distillation process based on the model, analyze the carbon footprint contribution rate of the distillation process, and determine the main sources of carbon emissions to optimize corresponding carbon emission reduction.

[0078] After establishing the carbon footprint model of the distillation process, the relevant parameters of the distillation process were substituted into the model for calculation, and the carbon footprint of the distillation process was obtained to be 1513 (kgCO2-eq / ton). In this process, the carbon footprints of the production process, operation process and waste treatment process were also calculated.

[0079] As a preferred solution of this embodiment, relevant parameters are brought into the carbon footprint model calculation of the distillation process to obtain the carbon footprint of the distillation process and the carbon footprints of the three processes, and the contribution rate of the production process, the operation process, and the waste treatment process is analyzed based on the above-obtained data. Specifically, the proportion of the carbon footprint of the production process, the operation process, and the waste treatment process in the carbon footprint of the distillation process is calculated respectively, and used as the carbon footprint contribution rate of the production process, the operation process, and the waste treatment process.

[0080] The production process contribution rate G1 is calculated as follows: G1=∑ x (m x *k x ) / (A*CFP)*100% The operation process contribution rate G2 is calculated as follows: G2= (Ak O +Ek E +Z S k Z +H W k H ) / (A*CFP)*100% The waste treatment process contribution rate G3 is calculated as follows: G3=∑ y (m y *k y ) / (A*CFP)*100% Based on the assumptions of this embodiment, the carbon footprint contribution rates of the production process, operation process, and waste treatment process calculated are 0.00534%, 99.99465%, and 0.00001%, respectively.

[0081] The contribution rates of each process in the distillation process are sorted by size, and the process with the largest contribution rate is determined as the main source of carbon emissions. From the above results, it can be seen that the contribution rates of each process in the distillation process are sorted by size as follows: operation process, production process, and waste treatment process. Therefore, the operation process is the main source of carbon emissions, and the sources of carbon footprint involved in the operation process are optimized for carbon reduction.

[0082] As a solution of this embodiment, according to the materials and energy required for the operation of the equipment during operation, including power consumption, steam consumption, circulating water consumption, and raw liquid consumption during operation, power consumption is selected for carbon emission reduction optimization, preferably from the perspective of low-carbon electricity, using energy power generation instead of traditional thermal power generation, reducing greenhouse gas emissions generated by power consumption during operation. Therefore, the carbon footprint calculation formula of the operation process is optimized as follows: CFP O = (Ak O +Ek e +Z S k Z +H W k H ) / A Among them, k e (kgCO2-eq / kg) is the carbon footprint factor of electricity after low carbonization.

[0083] Without changing the operating conditions and considering the low-carbonization of electricity, the carbon footprint of the distillation process is reduced to 1397 (kgCO2-eq / ton), a decrease of 7.7% compared to traditional thermal power generation.

[0084] In addition to the above-mentioned carbon emission reduction optimization strategy for the operation process, it also includes carbon emission reduction optimization strategies for the production process and the waste treatment process. As a scheme of this embodiment, for the production and waste processes, most of the equipment such as distillation towers, reboilers, condensers and pumps are made of metal materials. The recycled waste metal materials can be used to offset the raw materials required for the metal production process after processing, reduce the consumption of raw materials in the production process, and reduce carbon emissions from the production process and waste treatment process. The carbon footprint calculation formula for the production process is optimized as follows: CFP P =∑ x ( (m1-m2)*k x ) / A Among them, m1 (kg) is the mass of virgin material required for each raw material in the production process, and m2 (kg) is the mass of recycled material required for each raw material in the production process.

[0085] 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.

[0086] Although this article uses more terms such as distillation process, production process, operation process, waste treatment process, carbon footprint assessment model, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A method for optimizing carbon emission reduction in a distillation process based on carbon footprint assessment, characterized in that: The following steps are involved: S1. Determine the functional units and system boundaries for carbon footprint assessment of distillation process; S2. Analyze the distillation process based on greenhouse gas emissions to obtain the materials and energy involved in the carbon footprint; S3. Based on the life cycle assessment, a carbon footprint assessment model for the distillation process is established according to the substances and energy; S4. Calculate the carbon footprint of the distillation process based on the model, analyze the carbon footprint contribution rate of the distillation process, and determine the main sources of carbon emissions to optimize corresponding carbon emission reduction.

2. The method for optimizing carbon emission reduction in distillation process based on carbon footprint assessment according to claim 1, characterized in that: The step S1 specifically includes: The functional unit for carbon footprint assessment is determined based on greenhouse gas emissions per unit ton of raw materials processed; The distillation process is divided into the production process, operation process and waste treatment process of the equipment to determine the system boundary of the carbon footprint assessment.

3. The method for optimizing carbon emission reduction in distillation process based on carbon footprint assessment according to claim 1, characterized in that: The step S2 specifically includes: Determine the raw materials involved in the carbon footprint based on the greenhouse gas emissions generated by the raw materials consumed by equipment during the production process; Determine the substances and energy involved in the carbon footprint based on the greenhouse gas emissions generated by the substances and energy required for the operation of the equipment during operation; Determine the waste involved in the carbon footprint based on the greenhouse gas emissions generated by the waste treatment process equipment.

4. The method for optimizing carbon emission reduction in distillation process based on carbon footprint assessment according to claim 3 is characterized in that: Obtain the materials and energy involved in the carbon footprint, and obtain the carbon footprint factors corresponding to the materials and energy.

5. The method for optimizing carbon emission reduction in distillation process based on carbon footprint assessment according to claim 1, characterized in that: A carbon footprint assessment model for the distillation process is established. The model is the sum of the carbon footprint of the production process, the carbon footprint of the operation process, and the carbon footprint of the waste treatment process.

6. The method for optimizing carbon emission reduction in distillation process based on carbon footprint assessment according to claim 5, characterized in that: The carbon footprint of the production process is the sum of the product of the consumption of various raw materials and the corresponding carbon footprint factor, and the quotient of the raw material liquid processing volume during the operation process, wherein the raw material liquid processing volume during the operation process is the product of the raw material liquid flow rate, annual operating time, equipment life, and parameters.

7. The method for optimizing carbon emission reduction in distillation process based on carbon footprint assessment according to claim 6, characterized in that: The carbon footprint of the operation process is the sum of the product of the raw liquid flow rate and the raw liquid carbon footprint factor, the product of the electricity consumption and the electricity carbon footprint factor, the product of the steam consumption and the steam carbon footprint factor, the product of the circulating water consumption and the circulating water carbon footprint factor, and the quotient of the raw liquid processing volume during the operation process.

8. The method for optimizing carbon emission reduction in distillation process based on carbon footprint assessment according to claim 6, characterized in that: The carbon footprint of the waste treatment process is the sum of the product of the treatment amount of each waste material in the waste treatment process and its corresponding carbon footprint factor, and the quotient of the treatment amount of the raw material liquid in the operation process.

9. A method for optimizing carbon emission reduction in a distillation process based on carbon footprint assessment according to any one of claims 1 to 8, characterized in that: The analysis of the carbon footprint contribution rate of the distillation process specifically includes: The proportion of the carbon footprint of the production process, operation process and waste treatment process in the carbon footprint of the distillation process is calculated respectively, and the contribution rate of the carbon footprint of the production process, operation process and waste treatment process is obtained.

10. The method for optimizing carbon emission reduction in distillation process based on carbon footprint assessment according to claim 9, characterized in that: The determination of the main sources of carbon emissions to optimize corresponding carbon emission reductions specifically includes: The contribution rates of each distillation process are sorted by size, and the process with the largest contribution rate is determined as the main source of carbon emissions. The sources of carbon footprint involved in this process are then optimized for carbon emission reduction.

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