CN114637967A - Accounting method for carbon emission in whole process of asphalt concrete surface layer pavement - Google Patents
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Abstract
The invention discloses a method for accounting carbon emission in the whole process of paving an asphalt concrete surface course, which comprises the following steps: determining the whole construction process stage of the asphalt pavement and the corresponding accounting precision requirement; according to the requirement of accounting precision in the whole process stage of asphalt pavement construction, accounting the carbon emission in the asphalt concrete production stage, the carbon emission in the asphalt concrete transportation stage and the carbon emission in the asphalt concrete on-site paving and rolling stage; and (4) calculating the total carbon emission amount of the whole process of paving the asphalt concrete surface layer according to the carbon emission amount of the asphalt concrete production stage, the carbon emission amount of the asphalt concrete transportation stage and the carbon emission amount of the asphalt concrete on-site paving and rolling stage. By adopting the technical scheme, the carbon emission accounting of the whole chain of the asphalt layer pavement is realized, and the method has important significance for building and evaluating low-carbon environment-friendly asphalt pavements in the future.
Description
Technical Field
The invention belongs to the technical field of energy conservation and emission reduction of traffic construction, and relates to a calculation method for carbon emission in the whole process of asphalt concrete surface course pavement.
Background
By the end of 2020, the total highway mileage in the country reaches 519.81 kilometers, wherein the highway mileage reaches 18.56 kilometers, and the mileage scale continues to remain world-first. The asphalt pavement has obvious advantages in the aspects of comfort, visual effect and maintenance convenience, and accounts for more than 90% of highway pavements in China, a large amount of raw materials are consumed in the construction process of the asphalt pavement, and a large amount of greenhouse gas is generated by using a large amount of mechanical equipment in the construction and maintenance processes. Therefore, in response to the "low carbon economy" being actively pursued, and in response to the development trend of the carbon emission trading system in China in the future, it is necessary to organize and develop the carbon emission measurement and analysis of road engineering construction as early as possible, and to discuss the evaluation technical method of low carbon roads.
At present, some researches are carried out on carbon emission accounting in the construction process of the asphalt concrete surface course at home and abroad, but China still lacks a systematic carbon emission accounting system and standard in the whole process of paving the asphalt concrete surface course, and has no definite grading standard for the concrete paving task of the asphalt surface courses with different grades and the carbon emission measurement and calculation requirements. In view of this, it is urgently needed to establish a carbon emission accounting method suitable for paving an asphalt concrete surface course at each service level so as to enable construction units and construction enterprises to accurately evaluate the carbon emission reduction effectiveness of new technologies, new materials and new equipment of low-carbon green asphalt pavement.
Disclosure of Invention
The invention aims to solve the problem of providing a method for accounting carbon emission in the whole process of asphalt concrete surface course pavement, realizes the accounting of the carbon emission of the whole chain of the asphalt layer pavement, and has important significance for future construction and evaluation of low-carbon and environment-friendly asphalt pavements.
In order to achieve the purpose, the invention adopts the following technical scheme:
an accounting method for carbon emission in the whole process of asphalt concrete surface course pavement comprises the following steps:
s1, determining the whole construction process stage of the asphalt pavement and the corresponding accounting precision requirement; wherein, bituminous paving construction overall process stage includes: the method comprises the steps of asphalt concrete production, asphalt concrete transportation and asphalt concrete on-site paving and rolling;
step S2, according to the requirement of the accounting precision of the whole process stage of the asphalt pavement construction, accounting the carbon emission of the asphalt concrete production stage, the carbon emission of the asphalt concrete transportation stage and the carbon emission of the asphalt concrete on-site paving and rolling stage;
and step S3, calculating the total carbon emission amount of the whole process of the pavement of the asphalt concrete surface layer according to the carbon emission amount of the asphalt concrete production stage, the carbon emission amount of the asphalt concrete transportation stage and the carbon emission amount of the asphalt concrete on-site paving and rolling stage.
Preferably, the accounting accuracy requirement includes: calculating actual emission accounting, combining actual emission accounting with experience estimation and experience estimation.
Preferably, in step S2, the carbon emission in the asphalt concrete production stage is calculated as:
level one: EC (EC)(M)i＝ACi；EE(M)＝AE(M)
Level two: EC (EC)(M)i＝T(M)·UC(M)i；EE(M)＝T(M)·UE(M)
Level three: EC (EC)(M)i＝T(M)·C(M)e；EE(M)＝T(M)·E(M)e
Wherein i is the energy variety consumed by asphalt heating during asphalt concrete mixing; j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(M)Carbon emission in the mixing stage of the asphalt concrete; EC (EC)(M)iThe consumption of the i-type energy in the asphalt concrete mixing stage is calculated; DEF(M)jJ greenhouse gas emission factors which are energy consumption in the asphalt concrete mixing stage; GWPjIs the global warming potential value of the j greenhouse gases; NCViThe average lower heating value of the ith type energy source; EE(M)The electric energy consumed in the first mixing process; DEF(M)eGreenhouse gas emission factors of local regional power grids consumed by the mixing stage; "level one" is the actual emissions accounting; "level two" is the combination of actual emissions accounting and empirical estimation; "horizontal three" is an empirical estimate;
for level one: ACiThe ith type of energy consumed in the actual measurement mixing process; AE(M)Measuring the electric energy consumed in the mixing process;
for level two: t is(M)Is total pitchMixing task amount of green concrete; UC(M)iThe consumption of the i-type energy is the unit workload of the mixing stage; UE (user Equipment)(M)The electric energy consumption is the unit work load of the mixing stage;
for level three: c(M)eThe energy consumption is the experience energy consumption of the mixing stage; e(M)eThe electric energy consumption is the experience electric energy consumption of the mixing stage.
Preferably, in step S2, the carbon emission in the asphalt concrete transportation stage is:
level one:
level two:
level three: EC (EC)(T)i＝Se·C(T)e EE(T)＝Se·E(T)e
Wherein j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(T)Carbon emission in the asphalt concrete transportation stage; EC (EC)(T)iThe i-type energy consumption for the transportation process; DEF(T)jA j-class greenhouse gas emission factor of energy consumed for transportation; GWPjIs the global warming potential value of the j-type greenhouse gas; NCViThe average lower heating value of the ith type energy source; EE(T)The electric quantity consumed in the transportation process; DEF(T)eGreenhouse gas emission factors for local regional power grids consumed for the transport phase; "level one" is the actual emissions accounting; "level two" is the combination of actual emissions accounting and empirical estimation; "horizontal three" is an empirical estimate;
for level one: z is a vehicle with actually measured energy consumption in the transportation stage; AF(i)zFor actually measuring the z th vehicle full load transportation asphalt concreteI-type energy consumption of (1); AF'(i)zThe method comprises the steps of actually measuring the i-type energy consumption of a z-th vehicle in no-load running; AE (E)zActually measuring the electric energy consumption of the z th vehicle for full-load transportation of the asphalt concrete; AE'zThe method comprises the steps of actually measuring the power consumption of the z th vehicle during no-load running;
for level two: siThe running distance of the vehicle for full-load transportation of asphalt concrete; si' is the vehicle empty running distance; n isiIs a vehicle shift in the asphalt concrete transportation process; FCFiIs the full load constant rate fuel consumption of the transport vehicle; NCFiConstant fuel consumption for full load of the transport vehicle; FCE is full-load constant-speed power consumption of the transport vehicle; NCE is the full-load constant-speed electric energy consumption of the transport vehicle;
for level three: seFor the total mileage for transporting the asphalt concrete, neTotal number of experienced vehicles for transporting asphalt concrete, C(T)eEmpirical fuel consumption for transporting asphalt concrete; e(T)eThe power consumption is the experience of transporting asphalt concrete.
Preferably, in step S2, the carbon emission in the on-site paving and rolling stage of the asphalt concrete is:
level one: EC (EC)(C)m＝ACm；EE(C)m＝AEm
Level two: EC (EC)(C)m＝T(C)m·UC(C)m；EE(C)m＝T(C)m·UE(C)m
Level three: EC (EC)(C)m＝T(C)m·C(C)me；EE(C)m＝T(C)m·E(C)me
Wherein m is each process of pavement construction, and m is 1, 2 and 3, which respectively represent milling and cleaning of the asphalt pavement, paving of asphalt concrete and rolling of the asphalt concrete; j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(C)Carbon emission in the construction stage of the asphalt surface layer; EC (EC)(C)mThe energy consumption of the mth process; DEF(C)jJ-type greenhouse gas emission factors which are energy consumption in the construction stage; GWPjIs the global warming potential value of the j-type greenhouse gas; NCVmThe average lower calorific value of the energy consumed in the mth process; DEF(C)eGreenhouse gas emission factors of local regional power grids consumed in the construction stage; EE(C)mThe electric energy consumed by the mth process; "level one" is the actual emissions accounting; "level two" is the combination of actual emissions accounting and empirical estimation; "horizontal three" is an empirical estimate;
for level one: ACmMeasuring the energy consumed in the mth process of pavement construction; AE (E)mThe electric energy consumed by the mth process of road surface construction is actually measured;
for level two: t is a unit of(C)mThe total task amount of the mth process; UC (unified power unit)(C)mThe construction energy consumption of unit mileage of the mth process is calculated; UE (user Equipment)(C)mThe unit mileage construction power consumption of the mth process is realized;
for level three: c(C)meThe experience energy consumption of the mth process; e(C)meIs the experience power consumption of the mth process.
Preferably, the total carbon emission in the whole process of paving the asphalt concrete surface layer is calculated as follows:
wherein E isCO2eCarbon emission in the whole process of paving the asphalt surface layer concrete; eCO2e(M)Carbon emission in the asphalt concrete production stage; eCO2e(T)Carbon emission in the asphalt concrete transportation stage; eCO2e(C)The carbon emission in the asphalt concrete on-site paving and rolling stage is reduced.
The invention fully considers all possible carbon emission sources caused by asphalt concrete surface layer pavement, combines the actual measurement and prediction difficulty and requirements, realizes the carbon emission accounting of the whole chain of the asphalt layer pavement, and has important significance for future construction and evaluation of low-carbon environment-friendly asphalt pavement. The method is characterized in that carbon emission accounting is paved on an asphalt concrete surface layer facing different grades of roads (highways and urban roads) or project requirements, differentiated accounting accuracy control types are implemented, and the method is divided into three types of accounting accuracy levels of actual emission accounting, combination of actual emission accounting and experience estimation.
Drawings
Fig. 1 is a flow chart of the accounting method for carbon emission in the whole process of asphalt concrete surface course pavement.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1:
as shown in fig. 1, the invention provides an accounting method for carbon emission in the whole process of asphalt concrete surface layer pavement, which aims at the carbon emission accounting of asphalt pavement construction required by roads (highways and urban roads) of different grades or construction projects, and implements differentiated accounting precision control types, wherein the types are divided into three accounting precisions of 'horizontal one, horizontal two and horizontal three'. The carbon emission accounting is finished according to the 'level one', namely, the accounting process is finished based on the actual project carbon emission investigation or actual measurement data. The carbon emission accounting should be completed at least according to the 'level two', namely, the accounting process should be completed based on the combination of partial actual project carbon emission investigation or actual measurement data and partial estimation data. The carbon emission reduction check of low-grade roads (three-grade roads and below, urban secondary roads and below and the like) or the service of construction projects is to complete the carbon emission accounting at least according to the 'level three', namely the accounting process is implemented and completed according to local or national typical experience and by combining with the specific conditions of the construction projects. Wherein, the 'level one' is the calculation of actual emission accounting; "level two" is the combination of actual emissions accounting and empirical estimation; "level three" is an empirical estimate.
The accounting method comprises the following steps:
step one, determining different accounting stages and corresponding accounting precision requirements according to engineering requirements
The carbon emission source of the whole process of asphalt pavement construction is divided according to different construction procedures: the method comprises three stages, namely an asphalt concrete mixing stage of a mixing station, a transportation stage of asphalt concrete from the mixing station to a construction site and a construction stage of an asphalt surface layer, and obtains different asphalt surface layer construction energy consumption investigation data according to different actual carbon emission measuring and calculating precision requirements of engineering projects.
Step two, determining carbon emission coefficients of various energy consumption
Selecting the average low calorific value of energy, greenhouse gas emission factors of various energy and global warming potential values as background data for calculation, and finally converting the calculation result into equivalent carbon dioxide emission of three gases, namely carbon dioxide, methane and nitrous oxide;
step three, calculating the carbon emission in the asphalt concrete production stage (asphalt concrete mixing stage of mixing station)
After determining the carbon emission measurement precision requirement in the asphalt concrete mixing stage, calculating the carbon emission result in the asphalt concrete mixing stage according to a formula (1) by combining the mixing stage calculation parameters and the engineering investigation result:
level one: EC (EC)(M)i＝ACi；EE(M)＝AE(M)
Level two: EC (EC)(M)i＝T(M)·UC(M)i；EE(M)＝T(M)·UE(M)
Level three: EC (EC)(M)i＝T(M)·C(M)e；EE(M)＝T(M)·E(M)e
Wherein i is the energy variety consumed by asphalt heating during asphalt concrete mixing; j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(M)Carbon emission (kgCO) of asphalt concrete mixing stage2e)；EC(M)iThe consumption of the i-type energy in the asphalt concrete mixing stage (the unit of solid or liquid fuel is t; the unit of gas fuel is km)3)；DEF(M)jJ-type greenhouse gas emission factors (kg/TJ) which are used for consuming energy in the mixing stage of the asphalt concrete; GWPjIs the global warming potential value of the j-type greenhouse gas; NCViIs the average lower calorific value of the ith type of energy (the unit of solid or liquid fuel is MJ/t; the unit of gas fuel is MJ/km)3)；EE(M)Electrical energy consumed for the first blending process (kWh); DEF(M)eGreenhouse gas emission factor (tCO) of local regional power grid consumed for blending stage2e/MWh)；
For level one: ACiThe type i energy consumed for the actual measurement of the mixing process (solid or liquid fuel unit is t; gas fuel unit is km)3)；AE(M)Measuring the consumed electric energy (kWh) of the mixing process;
for level two: t is(M)The total asphalt concrete mixing task amount (t); UC(M)iClass i energy consumption per unit work of mixing stage (t/t for solid or liquid fuel; km for gaseous fuel; km for gas fuel)3/t)；UE(M)Electric energy consumption (kWh/km) per unit work load of the mixing stage;
for level three: c(M)eFor empirical energy consumption during the blending stage (t/t for solid or liquid fuel; km for gaseous fuel; km for liquid fuel)3/t)；E(M)eIs the empirical power consumption (kWh/t) of the mixing stage.
And step four, checking and calculating the carbon emission of the asphalt concrete in the transportation stage (the transportation stage of the asphalt concrete from the mixing station to the construction site)
After the calculation parameters of the asphalt concrete transportation link are determined, the conditions of actual measurement energy consumption, vehicle types, transportation distances and the like are combined, meanwhile, the formula considers the potential energy consumption of the novel clean energy transportation vehicle, and the carbon emission result of the asphalt concrete transportation stage is calculated according to the formula (2):
level one:
level two:
level three: EC (EC)(T)i＝Se·C(T)e EE(T)＝Se·E(T)e
Wherein j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(T)Carbon emission (kgCO) in the asphalt concrete transportation stage2e)；EC(T)iThe amount of i-type energy consumed for the transportation process (t in solid or liquid fuel; km in gaseous fuel)3)；DEF(T)jClass j greenhouse gas emission factor (kg/TJ) of energy consumed for transportation; GWPjIs the global warming potential value of the j-type greenhouse gas; NCViIs the average lower calorific value of the ith type of energy (the unit of solid or liquid fuel is MJ/t; the unit of gas fuel is MJ/km)3)；EE(T)Electricity consumed for the transport process (kWh); DEF(T)eGreenhouse gas emission factor (tCO) of local regional power grid consumed for transport phase2e/MWh)；
For level one: z is a vehicle with actually measured energy consumption in the transportation stage; AF(i)zMeasuring the i-type energy consumption (t/100km) of the z-th vehicle in full-load transportation of the asphalt concrete; AF'(i)zThe method comprises the steps of measuring the i-type energy consumption (t/100km) of the z-th vehicle in no-load running; AEzMeasuring the electric energy consumption (kWh/100km) of the z-th vehicle for full-load transportation of the asphalt concrete; AE'zMeasuring the electric energy consumption (kWh/100km) of the z-th vehicle in no-load running;
for level two: siThe travel distance (km) for transporting asphalt concrete for a vehicle full load; si' is the vehicle empty running distance (km); n isiA vehicle shift (shift/project) for the asphalt concrete transportation process; FCFiConstant fuel consumption (t/100km) for full load of the transport vehicle; NCFiConstant fuel consumption (t/100km) for a full load of the transport vehicle; FCE is the full-load constant-speed electric energy consumption (kWh/100km) of the transport vehicle; NCE is the full-load constant-speed electric energy consumption (kWh/100km) of the transport vehicle;
for level three: seFor total mileage (km), n, of transporting asphalt concreteeTotal number of experienced vehicles for transporting asphalt concrete, C(T)eEmpirical fuel consumption (t/km) for transporting asphalt concrete; e(T)eThe empirical power consumption (kWh/km) for transporting asphalt concrete is obtained.
And fifthly, accounting the carbon emission of the asphalt concrete in the on-site paving and rolling stage (the construction stage of the asphalt surface layer)
After the carbon emission measurement and calculation precision requirement of the asphalt surface layer pavement is determined, the carbon emission result of the asphalt surface layer pavement is calculated according to a formula (3) by combining the calculation parameters of the construction stage and the engineering investigation result:
level one is EC(C)m＝ACm；EE(C)m＝AEm
Level two: EC (EC)(C)m＝T(C)m·UC(C)m；EE(C)m＝T(C)m·UE(C)m
Level three: EC (EC)(C)m＝T(C)m·C(C)me；EE(C)m＝T(C)m·E(C)me
Wherein, m is each process of pavement construction, and m is 1, 2 and 3, which respectively represent milling and cleaning (curing) of asphalt pavement, paving of asphalt concrete and rolling of asphalt concrete; j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(C)Carbon emission (kgCO) for asphalt surface layer construction stage2e)；EC(C)mThe energy consumption of the mth process (t in solid or liquid fuel; km in gaseous fuel)3)；DEF(C)jJ-type greenhouse gas emission factors (kg/TJ) consuming energy in the construction stage; GWPjIs the global warming potential value of the j-type greenhouse gas; NCVmAverage lower calorific value of energy consumed by the mth process (MJ/t in solid or liquid fuel unit; MJ/km in gas fuel unit)3)；DEF(C)eGreenhouse gas emission factor (tCO) of local regional power grid consumed for construction phase2e/MWh)；EE(C)mElectrical energy (kWh) consumed for the mth process;
for level one: ACmThe energy consumed by the mth procedure of road surface construction is actually measured (the unit of solid or liquid fuel is t; the unit of gas fuel is km)3)；AEmMeasuring the consumed electric energy (kWh) of the mth process of the pavement construction;
for level two: t is(C)mThe total task amount (km) of the mth process; UC(C)mConstruction energy consumption per unit mileage for the mth process (unit of solid or liquid fuel is t/km; unit of gas fuel is km)3/km)；UE(C)mConstructing power consumption (kWh/km) for unit mileage of the mth process;
for level three: c(C)meEmpirical energy consumption for the mth process (t/km for solid or liquid fuel; km for gaseous fuel; m3/km)；E(C)meThe empirical power consumption (kWh/km) of the mth process.
Step six, accounting the total carbon emission amount of the whole process of paving the asphalt concrete surface layer
Calculating the three-stage carbon emission summary according to formula (4):
wherein E isCO2eCarbon emission (kgCO) of asphalt surface layer concrete pavement whole process2e)；ECO2e(M)Carbon emission (kgCO) in the asphalt concrete production stage2e)；ECO2e(T)Carbon emission (kgCO) in asphalt concrete transportation stage2e)；ECO2e(C)Carbon emission (kgCO) for on-site paving and rolling stage of asphalt concrete2e)。
Because the carbon emission evaluation system of the whole process of asphalt concrete surface course pavement is established on the investigation data, in order to reflect the carbon emission source in the asphalt pavement construction process and the data collection level in the field investigation process, the invention combines the investigation experience of the prior asphalt pavement, aims at the scenes with three precision requirements of the carbon emission calculation of the asphalt surface course concrete pavement in the future, and respectively draws up reasonable road surface construction energy consumption related data to explain the detailed calculation process of the invention.
Based on data research of a new construction of a first-level highway asphalt pavement in a certain province in northern China (wherein the asphalt surface layer structure is 5cm medium-grain modified asphalt concrete +7cm coarse-grain asphalt concrete), the carbon emission accounting method provided by the invention is applied to exemplarily explain the carbon emission accounting process under the requirement of differential accounting precision. The method specifically comprises the following steps:
step one, determining different accounting stages and corresponding accounting precision requirements according to engineering requirements
Dividing carbon emission sources of the whole process of asphalt pavement construction into: mixing asphalt concrete, transporting asphalt concrete from a mixing station to a construction site, and constructing an asphalt surface layer; according to different road surface grade requirements, three stages of carbon emission measurement standards are divided into the following steps: actual emission accounting, combination of actual emission accounting and empirical estimation, where three different demand scenarios are calculated.
Step two, determining carbon emission coefficients of various energy consumption
The average low heating value of energy, greenhouse gas emission factors of various energy sources and global warming potential values are selected as background data of calculation, the calculation result is finally converted into carbon dioxide, methane and nitrous oxide, and equivalent carbon dioxide emission of the three gases, the table 1 provides energy greenhouse gas emission factors for the average low heating value of energy substances possibly applied to mixing and construction activities of all asphalt pavements and IPCC reports, the table 2 provides global warming potential values calculated by converting the three greenhouse gases into the equivalent carbon dioxide, and the table 3 provides power grid carbon emission factors of China regions in 2015-2017 for calculating carbon dioxide emission caused by all electric energy consumption in the invention.
TABLE 1 average lower calorific value of energy and greenhouse gas emission factor
TABLE 2 global warming potential value of greenhouse gas (100 years)
| Greenhouse gases | Global warming potential value |
| CO2 | 1 |
| CH4 | 25 |
| N2O | 298 |
TABLE 3 carbon emission factor of power grid in region of 2017 with 2015-
Acquiring different asphalt surface layer construction energy consumption investigation data according to different accuracy requirements of actual carbon emission measurement and calculation of engineering projects, taking assumed construction energy consumption of an upper layer of 30km asphalt concrete as an example, respectively giving a construction energy consumption investigation table 4, a construction energy consumption investigation table 5 and a construction energy consumption investigation table 6, correspondingly calculating three accuracy requirements of actual emission accounting, combining the actual emission accounting with experience estimation and carrying out experience estimation.
TABLE 4 carbon emission level-investigation table for asphalt surface course construction
TABLE 5 carbon emission level two investigation table for asphalt surface course construction
Surface 6 asphalt surface course construction carbon emission level three investigation table
For level one: actual emission accounting
Step three, accounting the carbon emission in the asphalt concrete production stage
After determining the carbon emission measurement precision requirement in the asphalt concrete mixing stage, combining the mixing stage calculation parameters and the engineering investigation result, calculating the carbon emission result in the asphalt concrete mixing stage according to a formula (1) and a table 4:
EC(M)i＝ACi＝63(km3)；EE(M)＝AE(M)＝5130(kwh)
step four, accounting the carbon emission in the asphalt concrete transportation stage
After the calculation parameters of the asphalt concrete transportation link are determined, the conditions of actual measurement energy consumption, vehicle types, transportation distances and the like are combined, meanwhile, the formula considers the potential new transportation vehicles using clean energy for consuming the energy in the future, and the carbon emission result of the asphalt concrete transportation stage is calculated according to the formula (2) and the table 4:
step five, checking and calculating the carbon emission of the asphalt concrete in the on-site paving and rolling stage
After the carbon emission measurement and calculation precision requirement of the asphalt surface layer pavement is determined, the carbon emission result of the asphalt surface layer pavement is calculated according to a formula (3) and a table 4 by combining the calculation parameters of the construction stage and the engineering investigation result:
EC(C)m＝ACm＝33.2(t)；EE(C)m＝AEm＝200(kWh)
and step six, calculating the total carbon emission amount of the whole process of paving the asphalt concrete surface layer, and calculating the carbon emission amount of paving the asphalt concrete surface layer at the first level according to a formula (4):
for level two: actual emission accounting combined with empirical estimation
Step three, accounting the carbon emission in the asphalt concrete production stage
After determining the carbon emission measurement precision requirement in the asphalt concrete mixing stage, combining the mixing stage calculation parameters and the engineering investigation result, calculating the carbon emission result in the asphalt concrete mixing stage according to a formula (1) and a table 5:
EC(M)i＝T(M)·UC(M)i＝2.9×32100÷1000＝93.09(km3)；
EE(M)＝T(M)·UE(M)＝193.5×32100÷1000＝6211.35(kWh)
step four, accounting the carbon emission in the asphalt concrete transportation stage
After the calculation parameters of the asphalt concrete transportation link are determined, the conditions of actual measurement energy consumption, vehicle types, transportation distances and the like are combined, meanwhile, the formula considers the potential new transportation vehicles using clean energy for consuming the energy in the future, and the carbon emission result of the asphalt concrete transportation stage is calculated according to the formula (2) and the table 5:
step five, checking and calculating the carbon emission of the asphalt concrete in the on-site paving and rolling stage
After the carbon emission measurement and calculation precision requirement of the asphalt surface layer pavement is determined, the carbon emission result of the asphalt surface layer pavement is calculated according to a formula (3) and a table 5 by combining the calculation parameters of the construction stage and the engineering investigation result:
EC(C)m＝T(C)m·UC(C)m＝0.13×30+1.065×15＝35.85(t)；
EE(C)m＝T(C)m·UE(C)m＝30×10＝300(kWh)
step six, accounting the total carbon emission amount of the whole process of paving the asphalt concrete surface layer
And (3) calculating the total carbon emission of the asphalt concrete surface course pavement of the level two according to a formula (4):
for level three: empirical estimation
Step three, accounting the carbon emission in the asphalt concrete production stage
After determining the carbon emission measurement precision requirement in the asphalt concrete mixing stage, calculating the carbon emission result in the asphalt concrete mixing stage according to a formula (1) and a table 6 by combining the mixing stage calculation parameters and the engineering investigation result:
EC(M)i＝T(M)·C(M)e＝2.55×30＝76.5(km3)；
EE(M)＝T(M)·E(M)e＝225×30＝6750(kWh)
step four, accounting the carbon emission in the asphalt concrete transportation stage
After the calculation parameters of the asphalt concrete transportation link are determined, the conditions of actual measurement energy consumption, vehicle types, transportation distances and the like are combined, meanwhile, the formula considers the potential new transportation vehicles using clean energy for consuming the energy in the future, and the carbon emission result of the asphalt concrete transportation stage is calculated according to the formula (2) and the table 6:
step five, checking and calculating the carbon emission of the asphalt concrete in the on-site paving and rolling stage
After the carbon emission measurement and calculation precision requirement of the asphalt surface layer pavement is determined, the carbon emission result of the asphalt surface layer pavement is calculated according to a formula (3) and a table 6 by combining the calculation parameters of the construction stage and the engineering investigation result:
EC(C)m＝T(C)m·C(C)me＝30×1.05＝31.5(t)；
EE(C)m＝T(C)m·E(C)me＝30×10＝300(kWh)
step six, accounting the total carbon emission amount of the whole process of paving the asphalt concrete surface layer
And (3) calculating the total carbon emission of the asphalt concrete surface course pavement according to the formula (4):
finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. An accounting method for carbon emission in the whole process of asphalt concrete surface course pavement is characterized by comprising the following steps:
s1, determining the whole construction process stage of the asphalt pavement and the corresponding accounting precision requirement; wherein, the whole process stage of asphalt pavement construction includes: the method comprises the steps of asphalt concrete production, asphalt concrete transportation and asphalt concrete on-site paving and rolling;
step S2, according to the requirement of the accounting precision of the whole process stage of the asphalt pavement construction, accounting the carbon emission of the asphalt concrete production stage, the carbon emission of the asphalt concrete transportation stage and the carbon emission of the asphalt concrete on-site paving and rolling stage;
and step S3, calculating the total carbon emission amount of the whole process of the pavement of the asphalt concrete surface layer according to the carbon emission amount of the asphalt concrete production stage, the carbon emission amount of the asphalt concrete transportation stage and the carbon emission amount of the asphalt concrete on-site paving and rolling stage.
2. The method of claim 1, wherein the accounting accuracy requirement comprises: calculating actual emission accounting, combining actual emission accounting with experience estimation and experience estimation.
3. The method for accounting for carbon emissions in the whole process of paving an asphalt concrete pavement according to claim 2, wherein in step S2, the carbon emissions in the asphalt concrete production stage are accounted as follows:
level one: EC (EC)(M)i＝ACi；EE(M)＝AE(M)
Level two: EC (EC)(M)i＝T(M)·UC(M)i；EE(M)＝T(M)·UE(M)
Level three: EC (EC)(M)i＝T(M)·C(M)e；EE(M)＝T(M)·E(M)e
Wherein i is the energy variety consumed by asphalt heating during asphalt concrete mixing; j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(M)Carbon emission in the mixing stage of the asphalt concrete; EC (EC)(M)iThe consumption of the i-type energy in the asphalt concrete mixing stage is calculated; DEF(M)jJ-type greenhouse gas emission factors which are energy consumption in the asphalt concrete mixing stage; GWPjIs the global warming potential value of the j greenhouse gases; NCViThe average lower heating value of the ith type energy source; EE(M)The electric energy consumed for the first mixing process; DEF(M)eGreenhouse gas emission factors of local regional power grids consumed by the mixing stage; "level one" is the actual emissions accounting; "level two" is the combination of actual emissions accounting and empirical estimation; "horizontal three" is an empirical estimate;
for level one: ACiThe ith type of energy consumed in the actual measurement mixing process; AE(M)Measuring the electric energy consumed in the mixing process;
for level two: t is a unit of(M)The total asphalt concrete mixing task amount is calculated; UC(M)iThe consumption of the i-type energy is the unit workload of the mixing stage; UE (user Equipment)(M)The electric energy consumption is the unit work load of the mixing stage;
for level three: c(M)eThe empirical energy consumption of the mixing stage is achieved; e(M)eThe electric energy consumption is the experience electric energy consumption of the mixing stage.
4. The method for accounting carbon emissions during the whole process of paving an asphalt concrete pavement according to claim 2, wherein in step S2, the carbon emissions during the transportation stage of asphalt concrete are:
level one:
level two:
level three: EC (EC)(T)i＝Se·C(T)e EE(T)＝Se·E(T)e
Wherein j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(T)Carbon emission in the asphalt concrete transportation stage; EC (EC)(T)iThe i-type energy consumption for the transportation process; DEF(T)jA j-class greenhouse gas emission factor of energy consumed for transportation; GWPjIs the global warming potential value of the j-type greenhouse gas; NCViThe average lower heating value of the ith type energy source; EE(T)The electric quantity consumed in the transportation process; DEF(T)eGreenhouse gas emission factors for local regional power grids consumed for the transport phase; "horizontal one" is the actual emissions accounting; "level two" is the combination of actual emissions accounting and empirical estimation; "horizontal three" is an empirical estimate;
for level one: z is the vehicle with actually measured energy consumption in the transportation stage; AF(i)zMeasuring the i-type energy consumption of the fully loaded and transported asphalt concrete of the z-th vehicle; AF'(i)zThe method comprises the steps of actually measuring the i-type energy consumption of a z-th vehicle in no-load running; AEzActually measuring the electric energy consumption of the z th vehicle for full-load transportation of the asphalt concrete; AE'zThe method comprises the steps of actually measuring the power consumption of the z th vehicle during no-load running;
for level two: siThe running distance of the vehicle for full-load transportation of asphalt concrete; si' is the vehicle empty running distance; n isiIs a vehicle shift in the asphalt concrete transportation process; FCFiIs the full load constant rate fuel consumption of the transport vehicle; NCFiIs the full load constant rate fuel consumption of the transport vehicle; FCE is the full-load constant-speed electric energy consumption of the transport vehicle; NCE is the full-load constant-speed electric energy consumption of the transport vehicle;
for level three: seFor the total mileage for transporting the asphalt concrete, neTotal number of experienced vehicles for transporting asphalt concrete, C(T)eEmpirical fuel consumption for transporting asphalt concrete; e(T)eThe power consumption is the experience of transporting asphalt concrete.
5. The method for accounting for carbon emission in the whole process of paving an asphalt concrete surface course according to claim 2, wherein in the step S2, the carbon emission in the on-site paving and rolling stage of the asphalt concrete is as follows:
level one: EC (EC)(C)m＝ACm；EE(C)m＝AEm
Level two: EC (EC)(C)m＝T(C)m·UC(C)m；EE(C)m＝T(C)m·UE(C)m
Level three: EC (EC)(C)m＝T(C)m·C(C)me；EE(C)m＝T(C)m·E(C)me
Wherein m is each process of pavement construction, and m is 1, 2 and 3, which respectively represent milling and cleaning of the asphalt pavement, paving of asphalt concrete and rolling of the asphalt concrete; j is a greenhouse gas type, j is 1, 2 and 3, and represents CO respectively2、CH4、N2O；ECO2e(C)Carbon row for asphalt surface course construction stageReleasing quantity; EC (EC)(C)mThe energy consumption of the mth process; DEF(C)jJ-type greenhouse gas emission factors which are energy sources consumed in the construction stage; GWPjIs the global warming potential value of the j-type greenhouse gas; NCVmThe average lower calorific value of the energy consumed in the mth process; DEF(C)eGreenhouse gas emission factors of local regional power grids consumed in the construction stage; EE(C)mThe electric energy consumed by the mth process; "level one" is the actual emissions accounting; "level two" is the combination of actual emissions accounting and empirical estimation; "horizontal three" is an empirical estimate;
for level one: AC (alternating current)mEnergy consumed by the mth procedure of actually measuring the pavement construction is obtained; AEmThe electric energy consumed by the mth process of road surface construction is actually measured;
for level two: t is(C)mThe total task amount of the mth process; UC(C)mThe construction energy consumption of unit mileage of the mth process is calculated; UE (user Equipment)(C)mThe unit mileage construction power consumption of the mth process is realized;
for level three: c(C)meThe experience energy consumption of the mth process; e(C)meIs the experience power consumption of the mth process.
6. The method for accounting for carbon emissions throughout the paving process of an asphalt concrete pavement according to claim 2, wherein the total carbon emissions throughout the paving process of the asphalt concrete pavement is accounted for by:
wherein E isCO2eCarbon emission in the whole process of paving the asphalt surface layer concrete; eCO2e(M)Carbon emission in the asphalt concrete production stage; eCO2e(T)Carbon emission in the asphalt concrete transportation stage; eCO2e(C)The carbon emission in the asphalt concrete on-site paving and rolling stage is reduced.
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