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首页> 外文期刊>Aerosol and Air Quality Research >Investigating Real-World Emissions of China’s Heavy-Duty Diesel Trucks: Can SCR Effectively Mitigate NOx Emissions for Highway Trucks?
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Investigating Real-World Emissions of China’s Heavy-Duty Diesel Trucks: Can SCR Effectively Mitigate NOx Emissions for Highway Trucks?

机译：调查中国重型柴油卡车的实际排放量：SCR是否可以有效减轻公路卡车的NOx排放量？

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摘要

The Euro IV emission standards for heavy-duty diesel vehicles require a substantial reduction in NOx emissions, spurring the introduction of selective catalytic reduction (SCR) systems. However, previous studies have found unsatisfactory control of NOx emissions for SCR-equipped urban buses, which has raised concern among policy-makers and researchers regarding the capability of SCR adopted by heavy-duty diesel trucks (HDDTs) in real-world applications. This study tested sixteen HDDTs in China between 2010 and 2014, including six SCR-equipped Euro IV HDDTs using a portable emissions measurement system (PEMS). On-road emission measurement results show no significant difference in NOx emissions between Euro II and Euro III HDDTs. In contrast, we observed a substantial reduction in real-world NOx emissions, as low as 25.4 g kg-fuel–1, for six SCR-equipped HDDTs (Euro IV) compared with those without SCR systems (Euro II and Euro III), providing an overall reduction of ~50%. However, real-world brake-specific NOx emission factors for the SCR-equipped HDDTs were higher by ~45% than the lab test limit of 3.5 g kWh–1 due to off-cycle NOx emissions, indicating the importance of introducing real-world emission test requirements for HDDTs. Due to the introduction of SCR systems, distinctive impacts from real-world operating conditions are observed for HDDTs. For example, fuel-based NOx emission factors steadily decrease as the vehicle speed increases due to higher exhaust temperatures, which improve the efficiency of SCR systems.
机译：重型柴油车的欧IV排放标准要求大量减少NOx排放，从而鼓励采用选择性催化还原（SCR）系统。但是，先前的研究发现配备SCR的城市客车的NOx排放控制不尽人意，这引起了决策者和研究人员对重型柴油卡车（HDDT）在实际应用中采用SCR的能力的关注。这项研究在2010年至2014年间对16种HDDT进行了测试，包括使用便携式排放测量系统（PEMS）的6种配备SCR的Euro IV HDDT。公路排放测量结果表明，欧II和欧III HDDT之间的NOx排放没有显着差异。相比之下，与没有SCR系统的HDDT（欧洲II和III）相比，我们观察到六种配备SCR的HDDT（欧洲IV）的实际NOx排放量大幅降低，低至25.4 g kg-燃料-1，总体降低了约50％。但是，由于存在非循环的NOx排放，配备SCR的HDDT的实际制动专用NOx排放因子比3.5 g kWh–1的实验室测试极限高出〜45％，这表明引入现实世界的重要性HDDT的排放测试要求。由于引入了SCR系统，对于HDDT，观察到了来自实际运行条件的独特影响。例如，由于较高的排气温度，随着车速的增加，基于燃料的NOx排放因子稳步下降，从而提高了SCR系统的效率。

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