Study on the Generation Mechanism of Non-exhaust Emissions from New Energy Vehicles and Its Impact on Air Demands in Tunnels
With the widespread adoption of new energy vehicles(NEVs)in China,the composition ratio of pollutants in tunnels has been changing.To clarify the impact of NEVs on air demand in tunnels,the research methods including data investigation and theoretical analysis were employed to quantify the pollutant generation characteristics of NEVs and distinguish them from internal combustion engine vehicles.The impact of different mix ratios of large,me-dium,and small-sized NEVs on the air demand during tunnel operation was explored under influence of the gradient and vehicle speed.The tunnel air demand calculation formula in PIARC2019 was revised,and a calculation method for the correction factor was proposed.Detailed ventilation design method was provided based on a project case.The results are as follows:(1)Based on the generation mechanisms of non-exhaust particulate matter(PM)from four sources,the calculation formulae for the relationship between non-exhaust PM emissions and vehicle weight were provided;(2)The correction factors for baseline emissions of non-exhaust PM for large,medium,and small-sized NEVs are 1.127,1.093,and 1.088,respectively;(3)Considering the impact of tunnel gradient,vehicle speed,and mix ratio,a correction factor calculation method for the air demand in temporary construction transport tunnels and ordinary road tunnels was provided;(4)The discrimination formulae for three applicability conditions—no correc-tion,correction,and setting dust removal machine—were established for calculating the air demand during tunnel operation.
Highway tunnelNew energy vehiclesNon-exhaust emissionsAir demandVentilation schemeCorrec-tion factor
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