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| Paticulate matter and particle-phase PAHs emission characteristics of the China IV diesel engine |
| LU Kai-bo1, LIU Shuang-xi2, LI Zhen-guo2, GE Wei-hua3, JIN Tao-sheng1 |
1. College of Environmental Science and Engineering, State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Nankai University, Tianjin 300071, China;
2. China Automotive Technology and Research Center, Tianjin 300030, China;
3. Institute of Chemical defense, Beijing 102205, China |
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Abstract Particulate matter (PM) and particle-phase polycyclic aromatic hydrocarbons (p-PAHs) emission characteristics were studied using a China IV diesel engine equipped with Diesel Oxidation Catalyst + Particulate Oxidation Catalyst emission control device (DOC+POC) fueled with China IV diesel. The engine was tested with an engine dynamometer four times:during ESC cycle without and with emission control device, during ETC cycle without and with emission control device (marked as ESC-0, ESC-DP, ETC-0 and ETC-DP, respectively). PM was sampled using a pair of Pallflex Emfab filters, which were weighed before and after sampling to calculate the mass of PM. PAHs in PM were measured by Gas Chromatography-mass Spectrometry (GC-MS). For ESC-0, ESC-DP, ETC-0 and ETC-DP, PM emission factors were 0.12, 0.05, 0.48 and 0.16g/(kW·h), respectively, and p-PAHs emission factors were 69, 35, 174 and 76 μg/(kW·h), respectively. With emission control device, PM emissions were reduced by 56%~68%, and PAHs emissions were reduced by 49%~56%. In total p-PAHs mass, three-ring PAHs accounted for 64%±9%, and PHE accounted for 54%±9%. The distribution of PAHs was influenced by physicochemical characteristics of PAHs and PAHs contents in diesel. The FA/(FA+PY) ratios were 0.37~0.51.
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Received: 25 July 2015
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