清洁能源公交车实际道路排放特性研究

发布时间：2018-01-01 08:31

本文关键词：清洁能源公交车实际道路排放特性研究　出处：《北京理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：本文主要使用车载排放测试系统(Portable Emission Measurement System,PEMS),对北京市不同燃料类型(油电混合、天然气)的清洁能源公交车进行了实际道路排放检测,并与常规柴油公交车作对比,其中涵盖了不同排放阶段、不同后处理类型车辆。使用VSP方法对各公交车基于CO2排放量的各种污染物排放进行了研究分析。实验结果表明:国III阶段柴油车在低速、低负荷行驶状态下,与国IV和国V阶段公交车的CO2排放差距不明显,在高速行驶大负荷状态下,CO2排放明显高于其他车辆。不同排放阶段公交车之间CO和NOX排放差异不明显,国V阶段公交车THC排放略低于国III和国IV阶段公交车。国III阶段公交车PM排放明显高于国IV阶段公交车,国IV阶段公交车明显高于国V阶段公交车。油电混合动力公交车在低速、低负荷行驶状态下对CO2排放的降低程度很明显,在高速、大负荷行驶状态下对CO2排放的降低程度较低。油电混合动力公交车CO和THC排放均低于常规柴油动力公交车,基于CO2的NOX排放普遍高于常规柴油公交车。不同油电混合动力公交车PM排放差异很大,无法推断是否相对于常规柴油公交车具有优势。对于不同排放阶段天然气公交车对比,国V阶段公交车CO和THC排放水平均远远低于国III和国IV阶段公交车。国III阶段公交车NOX排放略高于国IV阶段公交车,远高于国V阶段公交车。各天然气公交车PM排放水平存在很大差异,没有明显规律。对于采用不同后处理方式的天然气公交车对比,采用OC+SCR后处理方式天然气公交车与采用TWC方式天然气公交车基于CO2的CO排放差别不大,柴油公交车排放明显高于天然气公交车。采用OC+SCR后处理方式的天然气公交车THC、NOX和PM排放均高于采用TWC后处理方式的天然气公交车,另外,柴油公交车THC排放最低,NOX和PM排放最高。采用OC+SCR后处理方式的天然气公交车和采用TWC后处理方式的天然气公交车排气温度差别不大,均高于常规柴油公交车排气温度,排气温度波动随车辆行驶工况变化较大,柴油公交车排气温度比较稳定。
[Abstract]:This paper mainly use the vehicle emission test system (Portable Emission Measurement System, PEMS), for different fuel types in Beijing city (hybrid, natural gas) clean energy buses of the real road emission test, and compared with conventional diesel buses, which covers the different discharge stages, different types of vehicles using VSP postprocessing. Method for the bus emissions of CO2 emissions are studied based on the analysis of experimental results. The results show that China III diesel vehicles in low speed, low load driving, and in IV and China V CO2 bus discharge gap is not obvious, at high speed under heavy load, CO2 emission was significantly higher than that of other vehicles CO and NOX emissions were not significantly different between different discharge stage bus, V bus THC emissions slightly lower than in stage III and stage IV in the bus. III bus PM stage Put in the IV stage was significantly higher than that of the bus, IV bus was significantly higher than that in stage V stage bus. The hybrid buses at low speed, low load operating conditions on the emission of CO2 decreased obviously in high speed, high load running condition to decrease CO2 emission level is relatively low. The hybrid buses CO and THC emissions are lower than that of the conventional diesel powered buses, CO2 NOX emissions based on generally higher than conventional diesel buses. Different hybrid buses PM emissions vary, unable to infer whether compared with conventional diesel buses have advantages in the different stage of gas emission in V phase comparison bus, bus CO and THC emission levels are far below III and China IV bus. III bus is slightly higher than that in stage NOX emission IV bus, far higher than the national stage V bus. The bus PM natural gas There is a big difference in the emission level, there is no apparent regularity. For comparison of natural gas buses with different postprocessing methods, using OC+SCR postprocessing method of the natural gas and natural gas buses using TWC bus is not CO difference based on CO2 emissions, emissions of diesel buses significantly higher than natural gas. Natural gas bus THC bus using OC+SCR postprocessing method the NOX and PM emissions are higher than that of the TWC postprocessing mode of natural gas buses, in addition, the lowest THC emission of diesel buses, NOX and PM. The highest emission of natural gas buses and using TWC postprocessing way natural gas bus exhaust temperature difference with OC+SCR postprocessing methods, were higher than that of the conventional diesel bus exhaust temperature. Exhaust temperature fluctuations with the vehicle driving condition changes greatly, the temperature of diesel buses exhaust is relatively stable.

【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U467.48;U469.13

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