CN111368356A - Method for calculating carbon emission of asphalt pavement in construction period - Google Patents
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Abstract
The invention discloses a carbon emission calculation method for an asphalt pavement in a construction period, which relates to three stages of production, transportation and pavement construction of raw materials of the asphalt pavement, and comprises the following steps: determining equivalent carbon emission factors of the raw materials; determining various energy equivalent carbon emission factors; and substituting the equivalent carbon emission factors, respectively calculating the carbon emission in the production, transportation and pavement construction stages of the raw materials, and accumulating to obtain the total carbon emission in the construction period of the asphalt pavement. The calculation method disclosed by the invention has the characteristics of higher universality, simplicity, convenience and practicability, can realize accurate quantitative calculation of carbon emission of road surface construction engineering, and has important significance for low-carbon emission reduction management and green road construction in the field of road engineering.
Description
Technical Field
The invention relates to the technical field of energy conservation and emission reduction of road engineering construction, in particular to a method for calculating carbon emission of an asphalt pavement in a construction period.
Background
Since the 21 st century, the economic development has been rapidly advanced, the global pressure for carbon emission reduction has been increasing, and a marketable environmental policy represented by carbon trading has been gradually applied in various countries. As the biggest developing country in the world, China has long firmly implemented an environmental protection policy, and the terms such as "Green Water Qingshan is the Jinshan Yinshan" are widely recognized in the world, and "Green development" are incorporated into relevant documents of United nations, so that the concept of Green development in China is gradually deepened into the heart. Road engineering is an important component of a traffic transportation system, is closely related to the development of national economy, promotes the economic development, generates huge carbon emission, and is particularly important for the green development of highway engineering.
The asphalt pavement has obvious advantages in the aspects of comfort, visual effect, maintenance and the like, and accounts for more than 90% of the high-grade highway pavement in China. In the process of asphalt pavement construction, a large amount of earth and stone, asphalt, chemical additives and other raw materials are needed, and the production, transportation and asphalt pavement construction processes of the materials generate a large amount of greenhouse gases. Therefore, no matter the low-carbon economy carried out by China is responded, or the development trend of the carbon emission trading system of China in future is responded, the carbon emission analysis of road engineering is necessary, the key link of carbon emission is established, the targeted energy-saving and emission-reduction measures are provided, the low-carbon road surface evaluation method is discussed, the road surface material and structure are optimized and adjusted, and the theoretical basis is provided for implementing project scheme comparison and establishing the industry standard.
The existing carbon emission calculation methods mainly comprise a material balance method, an actual measurement method and a carbon emission factor method. The material balance method requires that the statistical accounting of input and output is complete in the industry, and the road engineering does not have a definite record of the energy consumption of input and output, so the method is not suitable for the integral carbon emission calculation in the construction period. The actual measurement method adopts a direct measurement mode to measure and calculate the carbon emission of the product, and the realization difficulty is higher for the road engineering. The carbon emission factor is mainly used for calculating the carbon emission of product production according to the combustion carbon emission coefficients of different fossil energy sources, is suitable for industries mainly based on energy consumption, and is not specifically limited for calculation boundaries. In conclusion, the existing carbon emission calculation method has certain difficulty in being applied to carbon emission calculation in the asphalt pavement construction period, so that it is necessary to determine the boundary of a calculation model and provide a carbon emission calculation method suitable for the asphalt pavement construction period. According to the related quota and specification of the existing pavement engineering, a carbon emission factor method is combined, a carbon emission calculation model is established by determining model boundaries, model structures and model evaluation parameters, and the carbon emission in the asphalt pavement construction period in different pavement material and pavement structure combination modes is quantitatively compared.
Disclosure of Invention
The invention aims to provide a method for calculating carbon dioxide equivalent emission in an asphalt pavement construction period, which is used for simply and accurately calculating carbon emission in the asphalt pavement construction period.
In order to achieve the purpose, the invention is based on relevant documents, quota and specifications of road surface engineering, combines a carbon emission factor method, respectively establishes carbon emission calculation models in a raw material production stage, a raw material transportation stage and a road surface construction stage of the asphalt road surface, and accordingly establishes a carbon emission calculation model in the construction period of the asphalt road surface, and the specific technical scheme is as follows:
a carbon emission calculation method in an asphalt pavement construction period comprises the following steps:
the method comprises the following steps: and determining the total consumption of the raw materials and the equivalent emission factor of the carbon dioxide produced by the unit.
Step two: and determining the carbon dioxide equivalent emission factor of various energy sources.
Step three: and calculating the carbon emission in the raw material production stage. And determining the production amount of each raw material according to the full-width size of the pavement and the design and matching ratio of the pavement, and accumulating the production carbon emission of each material to obtain the carbon emission in the production stage of the raw material.
Step four: and calculating the carbon emission in the raw material transportation stage. And calculating the carbon emission in the raw material transportation stage according to the unit distance energy consumption and the transportation distance of the transportation machinery.
Step five: and calculating the carbon emission in the construction stage. And the construction stage is subdivided into four processes of mixing the mixture, transporting the mixture, paving the mixture and rolling the mixture, and the carbon emission amount in the construction stage is determined according to the unit shift energy consumption, the number of mechanical shifts, the unit carbon emission factor of energy and the like in each construction process. The machine and the corresponding machine number required by each construction process are related quota and standard specified value of the road engineering.
Step six: and calculating the total carbon emission in the construction period. The construction period is the sum of carbon emission in three stages of raw material production, raw material transportation and pavement construction.
Drawings
FIG. 1 is a diagram of a computational model architecture according to the present invention.
Detailed Description
The following non-limiting detailed description of the present invention is provided in connection with the examples and the accompanying drawings.
A carbon emission calculation method in an asphalt pavement construction period comprises the following specific calculation steps:
the method comprises the following steps: and determining the total consumption of the raw materials and the carbon emission factor of the unit production thereof.
Step two: and determining the carbon dioxide equivalent emission factor of various energy sources. Fossil energy mainly related to asphalt pavement construction comprises crude oil, fuel coal, heavy oil, diesel oil and gasoline, and carbon dioxide equivalent emission factors of various energy sources are converted according to relevant data of Chinese energy statistics yearbook 2017 and energy statistics workbook published by the energy department of the national statistics bureau of China, as shown in tables 1 and 2.
TABLE 1 carbon dioxide equivalent emission factor of various fossil energy sources
TABLE 2 average carbon dioxide emission factor of the China regional grid
Step three: and calculating the carbon emission in the raw material production stage. Determining the production amount of the ith raw material according to the full-width size of the pavement, the design mix proportion of the pavement and the like, accumulating the production carbon dioxide equivalent emission of the ith material to obtain the carbon dioxide equivalent emission in the production stage of the raw material, and calculating according to the following formula:
in the formula: g1The carbon dioxide equivalent emission, kgCO, in the raw material production stage2e; a is the width of the top layer of the pavement, m; b is the width of the bottom layer of the pavement, m; 2 is a trapezoidal area conversion coefficient; h is the structural layer height, m; rho is the average density of the road surface, kg/m3(ii) a l is the total length of the route, km; omegaiThe mass fraction of the ith material is percent; EFiProduction of carbon emission factor, kgCO, for unit mass of i-th raw material2e/t。
Step four: and calculating the carbon emission in the raw material transportation stage. Calculating the carbon emission in the raw material transportation stage according to the function of the oil consumption of the transportation machinery along with the change of the transportation distance, and calculating according to the following formula:
in the formula: g2For carbon emission in the raw material transportation stage, kgCO2e; a is the width of the top layer of the pavement, m; b is the width of the bottom layer of the pavement, m; 2 is a trapezoidal area conversion coefficient; h is the structural layer height, m; rho is the average density of the road surface, kg/m3(ii) a l is the total length of the route, km; omegaiThe mass fraction of the ith material in the mixing proportion is shown. Percent; EFijFor transporting the ith raw material in the jthCarbon emission per unit turnover of mode, kgCO2e/(t·km)；xijThe j transport mode distance, km, for the i material.
Step five: and calculating the carbon emission in the construction stage. And the construction stage is subdivided into four processes of mixing the mixture, loading the mixture, transporting the mixture, paving the mixture and rolling the mixture, and the carbon emission amount of the construction stage is determined according to the unit shift energy consumption, the number of mechanical shifts, the unit carbon emission factor of energy and the like of each construction process. The oil consumption of mechanical unit shifts related to each construction process and the mechanical shift number for processing a unit volume of a pavement entity are determined by related quota and standard specified values, such as road engineering budget quota (JTGT 3832-2018) and road engineering mechanical shift cost quota (JTG/T B06-03-2007). Calculated as follows:
① calculating carbon emission in the processes of mixing, loading, spreading and rolling of the mixture, and calculating according to the following formula:
in the formula: g31Carbon emission, kgCO, for bituminous mixtures during mixing (or paving or road-pressing)2e; a is the width of the top layer of the pavement, m; b is the width of the bottom layer of the pavement, m; 2 is a trapezoidal area conversion coefficient; 1000 is the volume conversion factor; l is the full length of the route, m; t isiFor mixing (or spreading or rolling) 1000m3The mixing station required by the i-th asphalt layer is a machine team, the machine team is 1000m3(ii) a m is the fossil energy mass consumed by each shift of a mixing station (or a paver or a road roller) in kg/shift; EFiFor consumption of a corresponding fossil energy equivalent carbon emission factor, kgCO, per unit mass2e/kg; e is the electric energy consumed by the unit shift of the mixing station (or paver or road roller), kwh/shift; EF's'iIs a power grid electric carbon emission factor, kgCO, of a mixing station (or a paver or a road roller) corresponding region2e/kwh。
② carbon emissions were calculated during transportation of the mix according to the following formula:
in the formula: g32kgCO, carbon emissions generated during transport of bituminous mixes from mixing stations to construction sites2e; a is the width of the top layer of the pavement, m; b is the width of the bottom layer of the pavement, m; 2 is a trapezoidal area conversion coefficient; 1000 is the volume conversion factor; l is the total length of the route, km; t isi1Is 1000m3Transporting machine class when the transport distance of the i-th asphalt layer is less than 1km, machine class/1000 m3；Ti5Is 1000m3Transporting machine class when the transport distance of the i-th asphalt layer is within 5km, machine class/1000 m3；Ti10Is 1000m3Transporting machine class when the transport distance of the i-th asphalt layer is 5-10 km, machine class/1000 m3(ii) a m' is the fossil energy mass consumed by a transport machinery unit shift, kg/shift; EFiConsumption of the equivalent carbon emission factor, kgCO, of fossil energy per unit mass for transport vehicles2e/kg。
③ calculating carbon emission at construction stage according to the following formula:
G3＝G31+G32(5)
step six: and calculating the total carbon emission in the construction period. The construction period is the sum of carbon emission in three stages of raw material production, raw material transportation and pavement construction, and is calculated according to the following formula:
G＝G1+G2+G3(4)
in the formula: g is carbon emission in the construction period, kgCO2e；G1For raw material stage carbon emissions, kgCO2e；G2For carbon emission in the raw material transportation stage, kgCO2e；G3For carbon emission in the road construction stage, kgCO2e。
Claims (5)
1. A carbon emission calculation method for asphalt pavement construction is characterized by comprising the following steps:
s1, determining equivalent carbon emission factors of the raw materials;
s2, determining various energy equivalent carbon emission factors;
s3, calculating the carbon emission in the raw material production stage;
s4, calculating the carbon emission in the raw material transportation stage;
s5, calculating carbon emission in the road surface construction stage;
and S6, calculating the total carbon emission of the asphalt pavement in the construction period.
2. The method for calculating carbon emission in the construction period of the asphalt pavement according to claim 1, characterized by comprising the following steps: step S3, calculating the equivalent carbon emission of the raw materials in the stage, determining the production consumption of the ith raw material according to the full-width size of the road surface, the design mix proportion of the road surface and the like, accumulating the equivalent carbon emission of the produced carbon dioxide of the ith material to obtain the equivalent carbon dioxide emission of the raw materials in the production stage, and calculating according to the following formula:
in the formula: g1The carbon dioxide equivalent emission, kgCO, in the raw material production stage2e; a is the width of the top layer of the pavement, m; b is the width of the bottom layer of the pavement, m; 2 is a trapezoidal area conversion coefficient; h is the structural layer height, m; rho is the average density of the road surface, kg/m3(ii) a l is the total length of the route, km; omegaiThe mass fraction of the ith material is percent; EFiProduction of carbon emission factor, kgCO, for unit mass of i-th raw material2e/t。
3. The method for calculating carbon emission in the construction period of the asphalt pavement according to claim 1, characterized by comprising the following steps: in step S4, the carbon emission in the raw material transportation stage is calculated according to the oil consumption and the distance of transportation machinery, and is calculated according to the following formula:
in the formula: g2For carbon emission in the raw material transportation stage, kgCO2e; a is the width of the top layer of the pavement, m; b is the width of the bottom layer of the pavement, m; 2 is a trapezoidal area conversion coefficient; h is the structural layer height, m; rho is the average density of the road surface, kg/m3(ii) a l is the total length of the route, km; omegaiThe mass fraction of the ith material in the mixing proportion is shown. Percent; EFijThe unit turnover carbon emission, kgCO, of the transport mode in the ith raw material2e/(t·km)；xijThe j transport mode distance, km, for the i material.
4. The method for calculating carbon emission in the construction period of the asphalt pavement according to claim 1, characterized by comprising the following steps: and step S5, calculating carbon emission in the road surface construction stage, dividing the construction stage into four processes of mixing of the mixture, loading of the mixture, transportation of the mixture, paving of the mixture and rolling of the mixture, and determining the carbon emission in the construction stage according to unit shift energy consumption, mechanical shift number, energy unit carbon emission factor and the like in each construction process.
Wherein the carbon emission in the processes of mixing the mixture, loading the mixture, paving the mixture and rolling the mixture is calculated according to the following formula:
in the formula: g31Carbon emission, kgCO, for bituminous mixtures during mixing (or paving or road-pressing)2e; a is the width of the top layer of the pavement, m; b is the width of the bottom layer of the pavement, m; 2 is a trapezoidal area conversion coefficient; 1000 is the volume conversion factor; l is the full length of the route, m; t isiFor mixing (or spreading or rolling) 1000m3The mixing station required by the i-th asphalt layer is a machine team, the machine team is 1000m3(ii) a m is the fossil energy mass consumed by each shift of a mixing station (or a paver or a road roller) in kg/shift; EFiFor consumption of a corresponding fossil energy equivalent carbon emission factor, kgCO, per unit mass2e/kg; e is the electric energy consumed by the unit shift of the mixing station (or paver or road roller), kwh/shift; EF's'iIs a power grid electric carbon emission factor, kgCO, of a mixing station (or a paver or a road roller) corresponding region2e/kwh。
5. The method for calculating carbon emission in the construction period of the asphalt pavement according to claim 1, characterized by comprising the following steps: in the step S5, carbon emission in the transportation process of the mixture is calculated according to the following formula:
in the formula: g32kgCO, carbon emissions generated during transport of bituminous mixes from mixing stations to construction sites2e; a is the width of the top layer of the pavement, m; b is the width of the bottom layer of the pavement, m; 2 is a trapezoidal area conversion coefficient; 1000 is the volume conversion factor; l is the total length of the route, km; t isi1Is 1000m3Transporting machine class when the transport distance of the i-th asphalt layer is less than 1km, machine class/1000 m3；Ti5Is 1000m3Transporting machine class when the transport distance of the i-th asphalt layer is within 5km, machine class/1000 m3；Ti10Is 1000m3Transporting machine class when the transport distance of the i-th asphalt layer is 5-10 km, machine class/1000 m3(ii) a m' is the fossil energy mass consumed by a transport machinery unit shift, kg/shift; EFiConsumption of the equivalent carbon emission factor, kgCO, of fossil energy per unit mass for transport vehicles2e/kg。
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| CN114637967A (en) * | 2022-04-06 | 2022-06-17 | 河北光太路桥工程集团有限公司 | Accounting method for carbon emission in whole process of asphalt concrete surface layer pavement |
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| CN116720652A (en) * | 2023-05-25 | 2023-09-08 | 邯郸市交通运输局干线公路建设管理中心 | Estimation method for VOCs emission in asphalt pavement construction period |
| CN116720652B (en) * | 2023-05-25 | 2024-05-24 | 邯郸市交通运输局干线公路建设管理中心 | Estimation method for VOCs emission in asphalt pavement construction period |
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