Life Cycle Assessment Of Clean Fuel Vehicles Based On Renewable Energy

The application of clean fuel vehicles is conducive to reducing greenhouse gas emissions and environmental pollution.Under the fuel production path based on renewable energy,the life cycle assessment of hydrogen fuel cell vehicles and compressed natural gas vehicles can achieve energy conservation and environmental protection.This work establishes two mathematical evaluation models of clean fuel vehicles,and determines the Gabi model of vehicle evaluation under different fuel scenarios.Taking the vehicle driving 100 km as the functional unit,the CML2001method is used to evaluate the impact of the inventory results,and the life cycle water footprint,carbon footprint and environmental impact analysis are carried out.The effects of different power grid structure and energy production on the results are studied by means of scenario simulation and uncertainty analysis.The main results are as follows:The water footprint of hydrogen production based on biomass sources is 76.77L/MJ and that of synthetic natural gas is 15.38 L/MJ.The carbon footprint of syngas is159.24 kg/GJ.Biomass growth stage accounts for the largest proportion of the total fruit（98%-99%）.Without considering the precipitation required by biomass,the two fuel production stages account for about 76%of the total water consumption.According to the market value,energy and mass distribution coefficient,the calculated hydrogen water footprint is 30.31 L/MJ,76.76 L/MJ and 90.68 L/MJ respectively.The water footprint of synthetic natural gas is 6.12 L/MJ,15.38 L/MJ and 18.12 L/MJ respectively,and the carbon footprint is 130.28 kg/GJ,159.24 kg/GJ and 167.80 kg/GJ respectively.Power consumption is the main factor affecting the results of the production process of two fuels.Based on the six fuel scenarios of hydrogen production from biomass,hydrogen production from steam methane reforming,hydrogen production from wind assisted electrolytic water,biomass to natural gas,coal to natural gas and biogas catalytic natural gas,the calculation results of the two vehicle water footprints are 54.6 L/100km,27.2L/100km,34.0 L/100km,46.1 L/100km,54.1 L/100km and 53.2 L/100km respectively.The water consumption caused by steel consumption accounts for 73.6%and 80.5%respectively.When the water consumption coefficient of steel is low,wind power generation is conducive to reducing the water consumption in the whole life cycle.The water consumption coefficient of steel cannot be ignored.Under the mutual restriction with the power structure,the fluctuation of WF can reach 250%.In the study,the three routes of hydrogen fuel cell vehicle show excellent environmental performance.Fuel cell vehicles based on electrolytic water and steam methane reforming hydrogen production technology are very efficient decarbonization schemes,with emissions of only 10.4 kg and 12.2 kg carbon dioxide equivalent per 100km.In addition,the acidification potential values of the two processes are 6.53×10^-3 kg SO₂-eq/100km and 1.03×10^-2 kg SO₂-eq/100km respectively,and the eutrophication potential values are 3.24×10^-4 kg PO₂~3-eq/100km and 7.62×10^-4 kg PO₂~3-eq/100km respectively.The hydrogen fuel cell vehicle based on the optimal route shows better environmental performance.