Effects of Biodiesel and Engine Load on Nanoparticle Emissions from a Heavy-Duty Diesel Engine
Diesel engine exhaust contains large numbers of fine particles that degrade air quality and contribute to adverse human health effects. This study aims to characterize the changes of nanoparticle number emission characteristics from a heavy-duty diesel engine, operating with selected blends of low-sulfur biodiesel (B2_S50, B10, and B20) and engine loads (0％, 25％, 50％, 75％) under steady cycle. Raw exhaust were sampled with a rotating disc thermo-dilution system, followed by measurements of number size distributions of 10 – 1000 nm non-volatile particles using a scanning mobility particle sizer and condensation particle counter (SMPS) system. The results show that the particle number emission concentrations decrease with increasing blends of biodiesel from 2％ to 20％, resulting in a particle number reduction of 35％. Increasing the engine load from 25％ to 75％, on the other hand, resulted in a particle number increase of 64％. Among various loads, the highest particle number emission concentrations were observed when running on B2_S50 fuel under idle condition, with the presence of non-volatile nucleation mode particles. The number size distributions of non-volatile particles showed an increase of mode diameters when increasing engine load, whereas increasing blends of biodiesel resulted in a relatively small increase of mode diameters. Overall, the present results suggest the increase of biodiesel content in fuels resulted in a minor reduction of nanoparticle number concentration and small increases of particle mode diameters. The increase of engine load resulted in moderate increases of particle number concentration and moderate increases of particle mode diameters.
Diesel engine exhaust Control technology Number concentration Size distribution
Yi-Jyun Liou Li-Hao Young Man-Ting Cheng Hsi-Hsien Yang Ying I. Tsai Lin-Chi Wang
Dept. of Occupational Safety and Health,China Medical University,Taichung,Taiwan Dept. of Environmental Engineering,National Chung Hsing University,Taichung,Taiwan Dept. of Environmental Engineering and Management,Chaoyang University of Technology,Taichung,Taiwan Dept. of Environmental Engineering and Science,Chia Nan University of Pharmacy and Science,Tainan,Ta Dept. of Chemical and Materials Engineering,Cheng Shiu University,Kaohsiung,Taiwan
国际会议
西安
英文
967-972
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）