CN117764272A - Method for measuring and calculating carbon emission in cable production and manufacturing process - Google Patents
Method for measuring and calculating carbon emission in cable production and manufacturing process Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 118
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 105
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- 238000000034 method Methods 0.000 title claims abstract description 100
- 239000002994 raw material Substances 0.000 claims abstract description 52
- 239000002699 waste material Substances 0.000 claims abstract description 38
- 238000004364 calculation method Methods 0.000 claims abstract description 31
- 238000004148 unit process Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims description 32
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 18
- 229910052802 copper Inorganic materials 0.000 description 18
- 239000010949 copper Substances 0.000 description 18
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Abstract
A carbon emission measuring and calculating method in the cable production and manufacturing process is characterized in that the carbon emission measuring and calculating in the cable production and manufacturing process is obtained by accumulating the carbon emission of each unit process, and the carbon emission measuring and calculating method is formed by superposing a cable production live-action process directly controlled by a cable production factory and a background summarizing process of raw materials, energy sources, environmental emission and waste to be disposed in the cable production process; according to the invention, the boundaries of the live-action processes are defined according to the cable production live-action processes directly controlled by the cable production factory, different live-action processes UP can be divided, and then the live-action process data summary (AP) life cycle list results of the list data in each live-action process UP are accumulated in a one-by-one comparison mode to construct the live-action process data summary. The invention refines the three-stage carbon emission calculation method and defines the system boundary and the choice rule. The method can realize the calculation of the carbon emission in the life cycle of the cable, improves the accuracy of the calculation result, and improves the data base for double control of the carbon emission amount and the carbon emission intensity of the cable supply chain.
Description
Technical Field
The invention belongs to the field of electrical equipment application, and particularly relates to a carbon emission measuring and calculating method in a cable production and manufacturing process.
Background
In the prior art, the method for measuring and calculating the carbon emission of the cable production process calculates the carbon emission of the product by an emission factor method, calculates the greenhouse gases emitted directly or indirectly by each link in the society and production activities by taking government, enterprises and the like as units, and is called as programming a greenhouse gas emission list. The emission factor method is the first carbon emission estimation method proposed by IPCC, and is also a method widely used at present. The basic idea is to construct activity data and emission factors for each emission source in accordance with a carbon emission inventory list, taking the product of the amount of energy used and the emission factor as an estimated value of carbon emission for the emission item. The list scope generally includes: energy activities, industrial processes, agricultural activities, land utilization changes, forestry and municipal waste treatment, and the like. The calculation formula is as follows: CO 2 Total emissions = Σ (amount of energy used to be put x emission factor), where emissions sources, fuels and technology types may cause emission factors to be different, put inThe energy of the coal can be uniformly converted into standard coal according to the standard, and the conversion factors are shown in the annual book of Chinese energy statistics.
The emission factor method has the advantages of simplicity, clarity, easiness in understanding, mature formulas, activity data and emission factor databases, and a large number of application example references. The following problems exist in accounting for carbon emissions of cable equipment by the emission factor method:
1) The full life cycle is generally not considered for one or several processes and the product carbon emissions accounted for are incomplete.
2) Mass balance problems for individual processes are often not considered, resulting in often inaccurate accounting results.
3) The carbon emission factor is affected by the technical level, production conditions, energy utilization and process, to the extent that the uncertainty of the accounting result is large.
Disclosure of Invention
The invention provides a carbon emission measuring and calculating method in the cable production and manufacturing process, which can realize the calculation of the carbon emission in the cable life cycle, improve the accuracy of the calculation result and improve the data base for double control of the carbon emission and the carbon emission intensity of a cable supply chain.
The concept (basic framework and logic) of the invention is that the carbon emission measurement and calculation in the cable production manufacturing process is obtained by accumulating the carbon emission of each unit process, and the carbon emission measurement and calculation is formed by superposing the cable production live-action process directly controlled by a cable production factory and the background summarizing process of raw materials, auxiliary materials, energy sources, environmental emission and waste to be disposed in the cable production process; the live procedure UP and the background procedure AP are described as follows:
1. the real process UP (Unit Process) is to convert the real original data generated in the real process from the site into the reference stream data of one process according to each km or each t, and obtain more than ten or more than ten data sets containing intermediate streams, namely the real process.
2. Background process AP (Aggregated Process) upstream processes from database or other author surveys are typically data sets that do not contain intermediate flows (i.e., lifecycle inventory results).
The cable production live-action process mainly comprises the production procedures of preliminary processing of raw materials, such as copper cutting and wiredrawing, plastic pouring and the like, which are carried out in a cable production plant; if the granularity of the data (i.e., the availability degree and the fineness degree of the data) is enough to divide the unit processes UP per each process step, the data is collected and processed individually for each unit process (the data processing method converts the unit process data into reference stream data); if the whole plant data is difficult to split (such as power is counted according to the whole plant caliber), the whole cable production process can be used as a large unit process.
The cable production background process is mainly a summary AP of all upstream processes and all downstream processes of input streams and output streams in the cable production process, such as copper mine exploitation, copper mine transportation, copper mine processing, etc. upstream of copper material of a cable main material until all upstream processes in the middle of entering a cable production plant of copper material, and carbon emissions of these all upstream processes are called carbon footprint factors. Like this, for example, waste collection downstream of the waste to be disposed of, waste transport to be disposed of, waste disposal to be disposed of (e.g., landfill, incineration, etc.).
The measuring and calculating method of the invention needs to be constructed by firstly defining the boundary of the live-action process according to the cable production live-action process directly controlled by a cable production factory (different live-action processes UP can be divided according to the use of a measuring and calculating model and the granularity of data), and then comparing the result of a life cycle list of background process data summary (AP) of the list data in each live-action process UP one by one.
The technical scheme of the invention is as follows: the calculation formula of the total carbon emission C of the cable production and manufacturing process chain is as follows:
C＝C raw materials +C Transportation of +C Manufacturing 1 (1)
Wherein:
c is the carbon emission (kg CO) of the cable from the cradle to the gate 2 e)；
-C Raw materials Carbon emissions (kg CO) for raw material capture stage 2 e)；
-C Transportation of Carbon emissions (kg CO) for raw material transport stage 2 e)；
-C Manufacturing Carbon emissions for the manufacturing stage(kg CO 2 e)；
The raw material acquisition stage comprises the following steps: the method comprises the steps of obtaining all outsourcing raw materials, parts and fossil energy which need to be input into a manufacturing stage; raw material transportation stage: all raw materials and auxiliary materials required by the production of the cable and the process of transporting the parts to the production place; manufacturing stage: the manufacturing process of the cable comprises the following steps: parts production, cable assembly, cable detection, cable packaging, delivery and waste disposal.
Carbon emission C in raw material acquisition stage Raw materials The calculation formula is as follows:
wherein:
-C raw materials Carbon emissions (kg CO2 e) for raw material capture stage;
-M i is the consumption (weight) of the ith raw and auxiliary materials;
-MF i the carbon footprint factor (kg CO2 e/unit raw and auxiliary material consumption) of the ith raw and auxiliary materials, namely the carbon emission of all the background summarizing processes of the ith raw and auxiliary materials from resource exploitation to processing, transportation and the like.
Carbon emission C in the raw material transportation stage Transportation of The calculation formula is as follows:
wherein:
-C transportation of Carbon emissions (kg CO2 e) for raw material transport stage;
-M i is the consumption (weight) of the ith raw and auxiliary materials;
di is the average distribution distance (km) of the ith raw and auxiliary material;
ti is the carbon footprint factor of the unit weight distribution distance [ kg CO2 e/(t x km) ] of the i-th raw and auxiliary materials in the distribution mode, namely the carbon emission in the background summarization process of the unit weight distribution distance of the raw and auxiliary materials in the distribution mode.
The carbon emission calculation formula at the manufacturing stage is as follows:
wherein:
-C manufacturing For the production stage carbon emissions (kg CO2 e):
fi is the consumption of the ith fossil energy source, mainly comprising oil, natural gas, etc.;
NFi is the consumption of the ith non-fossil energy source, mainly comprising electricity, steam;
EFi is the carbon footprint factor (kg CO2 e/unit energy consumption) of the ith energy source, i.e. the total background summarized process carbon emissions of the ith energy source from mining to processing and transportation, etc.;
fi is the consumption of the ith fossil energy source;
EMi-CO2 is the CO2 emission (kg CO2 e/unit energy consumption) produced by combustion of the ith fossil energy;
EMi-CH4 is CH4 emission (kg CH 4/unit energy consumption) generated by combustion of the ith fossil energy;
EMi-N2O is the N2O emission (kg N2O/unit energy consumption) produced by combustion of the ith fossil energy;
-1 is the global warming potential value of CO2, which is taken from IPCC sixth report;
-27.9 is the global warming potential value of CH4, which is from IPCC sixth report;
-273 is the global warming potential value of N2O, which is from IPCC sixth report;
wi is the discharge (kg) of the ith waste to be disposed of;
WFi is the carbon footprint factor (kg CO2 e/kg) of the treatment unit waste to be treated, i.e. the total background aggregate process carbon emission of the treatment unit waste to be treated from transportation to disposal, etc. in the treatment mode of the i-th waste to be treated;
- (-1/2) is a renewable waste material produced during the production of the cable plant, calculated as 50% of the carbon emissions of its alternative primary raw material and deducted from the life cycle carbon emissions of the cable plant;
RWi is the discharge of the ith renewable waste;
RRi is the carbon footprint factor (kg CO2 e/unit of renewable or reusable waste emissions) of the i-th renewable waste replaceable primary feedstock, i.e. the total background aggregate process carbon emissions of the i-th primary feedstock from resource exploitation to processing and transportation, etc.;
qi is the quality correction factor of the ith renewable waste material and of the alternative primary raw material, which is not greater than 1.
The invention also comprises a method for converting the original data into the real unit process list data:
when the real unit process data collection is actually developed, the data are often based on annual data of the whole plant, the data need to be processed into unit product reference flow aiming at the real unit process, namely unit quantity output, which is input and output data corresponding to consumption and emission of cables of each ton or kilometer; the data processing is as follows: raw data+algorithm (dividing each input-output list by unit weight or unit length) →single list data;
such as: discharge per unit product (1 km cable) =concentration flow duration/unit time yield duration
Such as: copper consumption per product (1 km cable) =annual copper consumption throughout the plant/annual length of cable produced throughout the plant
Such as: unit product (1 t cable) power consumption = plant-wide annual power consumption/plant-wide annual production tonnage of cable; or more accurate unit product (1 t cable) power consumption = whole plant annual power consumption-whole plant annual life power consumption-whole plant annual non-target other product power consumption/whole plant annual production target cable tonnage.
The trade-off rule of the invention:
all evaluable inputs and outputs within the life cycle evaluation range should be included:
-by collecting raw data for tracing back the primary stream if the data is available;
-or secondary data obtained from a scientific model in a lifecycle inventory database or file.
The selection principle can be adopted, and input and output with smaller influence on the life cycle evaluation result are ignored, including:
a) The weight of the cable product is less than 1%, and the components, raw materials and auxiliary materials are composed of non-rare noble metals or substances with non-high purity (the purity is more than 99.99 percent);
b) The weight of the product is less than 0.1%, and the components, raw materials and auxiliary materials are composed of rare noble metals or substances with high purity (the purity is more than 99.99%).
c) Packaging of raw materials or parts used to manufacture the cable products may be omitted;
d) The consumption and the emission of infrastructure, production equipment, personnel in the factory area and living facilities of factory building and the like can be ignored;
e) Installation and maintenance of manufacturing facilities and machines may be omitted.
The above excluded procedure should be recorded and the reason is explained. The total weight of input and output parts, raw materials and auxiliary materials is not more than 5% of the weight of the product.
Data collection notice of the present invention
1) Raw data collection notice
The evaluable input and output streams should be introduced over all analysis ranges.
People and outputs associated with the reference stream during each unit within the system boundary should be collected, including but not limited to:
-material consumption, energy consumption and water consumption;
-discharge of air, water and soil;
-waste from the analysis process. The waste classification and waste flow direction should be recorded in the life cycle evaluation report.
In addition, consideration should be given to:
-a temporal representation of the collected data;
-the collected data is representative of territories and technical aspects. If data is collected from multiple sites, data should be collected from a representative site; a method of summarizing a plurality of site data (i.e., a measurement method employed for each site) should be recorded in the life cycle evaluation report;
-recording the allocation method for the reference stream in the life cycle evaluation report;
data bias or data loss (data cannot be acquired at all sites) should be identified explicitly, and rules for handling these data loss should be recorded in the life cycle evaluation report.
Because it is difficult to characterize noise and malodor emissions, there is no need to collect information on these aspects. But the noise and malodor can be recorded separately.
2) Secondary data collection notice
If the raw data cannot be obtained, it is preferable to employ secondary data of the system boundary process. It should be clear that secondary data is consistent with the scope of investigation in terms of time, territory and technology.
In order to evaluate the coverage and consistency of the secondary data with the scope of the study, at the same time, secondary data in terms of time, area and technology should be listed for transparency and traceability. If information on time, region and technology is not available, a description should be made of the qualitative assessment. At the same time, the rules for adjusting the secondary data according to the scope of the study should also be explicitly described.
In addition, secondary data should be used from one of the following data sources:
-a database of life cycle assessment studies based on ISO14040 and ISO14044 or other employing (reference) ISO14040 and ISO14044 and validated by a third party professional;
-a database of life cycle listings verified and certified by the data provider as applying the product category rules;
-an unverified database or data, in which case the lifecycle assessment report should explain the reason for using the database or data.
Compared with the situation that the calculation results of different persons are possibly different and the accuracy difference is large in the traditional emission factor method, the invention establishes the life cycle evaluation model in the cable production and manufacturing stage in detail, refines the carbon emission calculation method in three stages, defines the system boundary and the choice rule, and simultaneously provides the attention points of primary data and secondary data collection when accounting is carried out according to the model. According to the cable life cycle carbon emission calculated by the model, calculation is complete, calculation results are accurate, and meanwhile, the uncertainty of the calculation results is low because the primary data UP and the secondary data AP adopted in the calculation are described. The invention proposes that the upstream unit process be considered for the calculation of the carbon emission in the cable production. (the national published electrical carbon emission standard is emission factor method, only a single production process is considered, and an upstream process is not considered, and the upstream process is mainly considered as Cheng Taiduo to be too complex; the processing method for converting the original data into the unit process data is provided (accounting is easier); the withholding of waste recovery at the production stage (accounting more scientifically) is considered. For the whole cable industry and the power grid industry, the calculation of the life cycle carbon emission (namely the carbon footprint of the cable from cradle to gate) in the production and manufacturing stage of the cable can be accurately carried out, the method is a basis for promoting the greenization of electrician equipment and realizing the double control of the carbon emission amount and the carbon emission intensity of a supply chain, and the method has great significance for the quantitative calculation of the total greenhouse gas/carbon emission amount, contribution analysis and potential analysis, identification of improvement emphasis and comparison and evaluation of alternative schemes; reference data can be provided for various improvements/decisions on collaborative emission reduction, in product design, process/technology development, production and supply chain management; the method can promote the cooperative carbon reduction of the whole industrial chain at the upstream and downstream of the cable so as to construct a green low-carbon supply chain of a power grid enterprise. Compared with other carbon emission accounting models, the accounting model provided by the invention is more comprehensive, feasible and scientific and is more useful.
Drawings
Fig. 1 is a schematic diagram of the overall process boundary of the life cycle of the cable manufacturing stage.
Detailed Description
Examples
The measuring and calculating model of the invention is formed by superposing a cable production live-action process directly controlled by a cable production factory and a background summarizing process of raw materials, auxiliary materials, energy, environmental emission, waste to be treated and the like used in the cable production process. The live procedure UP and the background procedure AP are described in the following table:
the cable production live-action process mainly comprises the production procedures of preliminary processing of raw materials, such as copper cutting and wiredrawing, plastic pouring and the like, which are carried out in a cable production plant. If the granularity of the data is enough, dividing the unit processes UP according to each procedure, and collecting and processing the data for each unit process independently; if the whole plant data is difficult to split (such as power is counted according to the whole plant caliber), a large unit process of cable production can be established.
The cable production background process is mainly a summary AP of all upstream processes and all downstream processes of input streams and output streams in the cable production process, such as copper mine exploitation, copper mine transportation, copper mine processing, etc. upstream of copper material of a cable main material until all upstream processes in the middle of entering a cable production plant of copper material, and carbon emissions of these all upstream processes are called carbon footprint factors. Like this, for example, waste collection downstream of the waste to be disposed of, waste transport to be disposed of, waste disposal to be disposed of (e.g., landfill, incineration, etc.).
The measuring and calculating model needs to be constructed by firstly defining the boundary of a live-action process according to the cable production live-action process directly controlled by a cable production factory (different live-action processes UP can be divided according to the use and the data granularity of the measuring and calculating model) and then comparing the result of a life cycle list of background process data summary (AP) of the list data in each live-action process UP one by one.
The whole process life cycle of the cable production and manufacturing stage comprises raw material acquisition, raw material transportation and cable manufacturing stage, and the whole process boundary schematic diagram is shown in fig. 1.
The embodiment is characterized in that the embodiment is a cross-linked polyethylene insulating aluminum sleeve polyethylene flame-retardant sheath longitudinal water-blocking single-core cable, the model is ZC-YJLW 03-Z127/220 1 multiplied by 1000, and specific information is shown in the following table.
| Basic information | Parameters (parameters) |
| Product name | Cross-linked polyethylene insulation aluminum sleeve polyethylene flame-retardant sheath single-core cable |
| Specification and model | ZC-YJLW03-Z 127/220 1×1000 |
| Basis weight of product | 20858kg/km |
| Current capacity (A) | 1406 |
| Operating temperature (. Degree. C.) | In air, the ambient temperature is 20 ℃, the grounding current is 0A, and the triangular arrangement is realized |
| Packaging material | Iron plate |
Step one, live-action data collection:
1km ZC-YJLW 03-Z127/220 1X 1000 specification type cable raw material acquisition stage data collection table
Data collection for energy use in 1km cable production and manufacturing stage
Waste disposal data collection table for 1km cable production and manufacturing stage
Note that: the carbon footprint factor is derived from the greenhouse gas emission coefficient library of the whole life cycle of Chinese products
Step two, calculating in stages:
raw material acquisition: including all acquisition processes of outsourcing raw and auxiliary materials, parts and the like which need to be input into the manufacturing stage. According to the calculation formula:
＝8000*4.77+300*2.91+5000*1.6+500*3.8+3000*22+3000*2.1
＝121233kgCO 2 e
raw material transportation stage: and (3) transporting all raw materials, auxiliary materials, parts and the like required for producing the cable to a production place. According to the calculation formula, the calculation formula is as follows:
the cable production and manufacturing stage: all fossil energy production processes required for producing cables, and parts manufacturing and machining processes. The manufacturing process of the cable generally comprises the following steps: parts production, cable assembly, cable detection, cable packaging, delivery and waste disposal. The calculation formula of carbon emission in the cable production stage comprises the following steps:
complete calculation of the total carbon emission c=c of the cable manufacturing process chain Raw materials +C Transportation of +C Manufacturing
＝121233+189.72+1458.24
＝122880.96kgCO2e
Note that: this embodiment is a simplified example in which a large number of upstream and downstream processes are calculated using the default carbon footprint factors of the corresponding processes as the background data set without actually tracing back the processes. In practical application, a process with higher contribution is generally required to be traced practically, for example, the process of copper mine exploitation, copper mine transportation, copper mine smelting and the like is required to be traced for the acquisition of raw material copper in the implementation. These processes may be actually traced back, or the cable plant may be required to directly dock suppliers to provide third party certified carbon footprint factors in the carbon footprint report (which contains upstream and downstream process summary APs) to simplify the calculation.
Claims (6)
1. A method for measuring and calculating carbon emission in the cable production and manufacturing process is characterized by comprising the following steps of:
the total carbon emission C of the cable production and manufacturing process chain is as follows: carbon emission C in raw material acquisition stage Raw materials Carbon emission C at raw material transport stage Transportation of Carbon emission C at manufacturing stage Manufacturing : the calculation formula is as follows:
C＝C raw materials +C Transportation of +C Manufacturing 1 (1)
Wherein:
-C is total carbon emission (kg CO 2 e)；
-C Raw materials Carbon emissions kg CO for raw material acquisition stage 2 e；
-C Transportation of Carbon emission kg CO for raw material transportation stage 2 e；
-C Manufacturing For carbon emission kg CO in the manufacturing stage 2 e。
2. The method for measuring and calculating carbon emission in the cable manufacturing process according to claim 1, wherein: carbon emission C in the raw material acquisition stage Raw materials : the method comprises the steps of obtaining all outsourcing raw materials, parts and fossil energy which need to be input into a manufacturing stage; raw material transportation stage: all raw materials and auxiliary materials required by the production of the cable and the process of transporting the parts to the production place; manufacturing stage: the manufacturing process of the cable comprises the following steps: part production, cable assembly, cable inspection, cable packaging, factory shipment, and carbon emission in waste disposal processes.
3. The method for measuring and calculating carbon emissions in a cable production process according to claim 1 or 2, wherein: the raw material obtaining stage carbon emission calculation formula is as follows:
wherein:
-C raw materials Carbon emissions (kg CO2 e) for raw material capture stage;
-M i is the consumption (weight) of the ith raw and auxiliary materials;
-MF i the carbon footprint factor (kg CO2 e/unit raw and auxiliary material consumption) of the ith raw and auxiliary materials, namely the carbon emission of all the background summarizing processes of the ith raw and auxiliary materials from resource exploitation to processing, transportation and the like.
4. The method for measuring and calculating carbon emission in the cable manufacturing process according to claim 1, wherein: carbon emission C in the raw material transportation stage Transportation of The calculation formula is as follows:
wherein:
-C transportation of Carbon emissions (kg CO2 e) for raw material transport stage;
-M i is the consumption (weight) of the ith raw and auxiliary materials;
di is the average distribution distance (km) of the ith raw and auxiliary material;
ti is the carbon footprint factor of the unit weight distribution distance [ kg CO2 e/(t x km) ] of the i-th raw and auxiliary materials in the distribution mode, namely the carbon emission in the background summarization process of the unit weight distribution distance of the raw and auxiliary materials in the distribution mode.
5. The method for measuring and calculating carbon emission in the cable manufacturing process according to claim 1, wherein: the carbon emission calculation formula at the manufacturing stage is as follows:
wherein:
-C manufacturing For the production stage carbon emissions (kg CO2 e):
fi is the consumption of the ith fossil energy source, mainly comprising oil, natural gas, etc.;
NFi is the consumption of the ith non-fossil energy source, including electricity, steam;
EFi is the carbon footprint factor (kg CO2 e/unit energy consumption) of the ith energy source, i.e. the total background summarized process carbon emissions of the ith energy source from mining to processing and transportation;
fi is the consumption of the ith fossil energy source;
EMi-CO2 is the CO2 emission (kg CO2 e/unit energy consumption) produced by combustion of the ith fossil energy;
EMi-CH4 is CH4 emission (kg CH 4/unit energy consumption) generated by combustion of the ith fossil energy;
EMi-N2O is the N2O emission (kg N2O/unit energy consumption) produced by combustion of the ith fossil energy;
-1 is the global warming potential value of CO 2;
-27.9 is the global warming potential value of CH 4;
-273 is the global warming potential value of N2O;
wi is the discharge (kg) of the ith waste to be disposed of;
WFi is the carbon footprint factor (kg CO2 e/kg) of the treatment unit waste to be treated, i.e. the total background aggregate process carbon emission of the treatment unit waste to be treated from transportation to disposal, etc. in the treatment mode of the i-th waste to be treated;
- (-1/2) is a renewable waste material produced during the production of the cable plant, calculated as 50% of the carbon emissions of its alternative primary raw material and deducted from the life cycle carbon emissions of the cable plant;
RWi is the discharge of the ith renewable waste;
RRi is the carbon footprint factor (kg CO2 e/unit of renewable or reusable waste emissions) of the i-th renewable waste replaceable primary feedstock, i.e. the total background aggregate process carbon emissions of the i-th primary feedstock from resource exploitation to processing and transportation, etc.;
qi is the quality correction factor of the ith renewable waste material and of the alternative primary raw material, which is not greater than 1.
6. The method for measuring and calculating carbon emission in a cable manufacturing process according to claim 1, further comprising the steps of:
when the real unit process data collection is actually developed, the data are often based on annual data of the whole plant, the data need to be processed into unit product reference flow aiming at the real unit process, namely unit quantity output, which is input and output data corresponding to consumption and emission of cables of each ton or kilometer; the data processing is as follows: the raw data + algorithm divides each input-output list by the basis of unit weight or unit length to a single list data.
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