Impact of natural gas fuel composition on criteria, toxic, and particle emissions from transit buses equipped with lean burn and stoichiometric engines
Impact of natural gas fuel composition on criteria, toxic, and particle emissions from transit buses equipped with lean burn and stoichiometric engines
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DOI：
10.1016/j.energy.2013.09.040
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发表时间：
2013-12-01
期刊：
影响因子：
9
通讯作者：
Durbin, Thomas D.
中科院分区：
文献类型：
--
作者：
Hajbabaei, Maryam;Karavalakis, Georgios;Durbin, Thomas D.
本研究调查了不同的天然气成分对不同技术公交车尾气排放的影响。在这项研究中，两个CNG（压缩天然气）巴士配备稀薄燃烧和OC（氧化催化剂），和一个化学计量的CNG巴士配备了TWC（三元催化剂）和EGR（废气再循环）进行了测试底盘测功机在CBD（中央商务区）的循环中的六个不同的气体混合物。这些气体代表了从具有高水平甲烷和相应较低能量含量/WN（沃泊数）的气体到具有较高水平重烃和相应较高能量含量/WN的气体的一系列组成。对于稀薄燃烧客车，低甲烷含量的气体表现出较高的NOx（氮氧化物）（19%-53%）和NMHC（非甲烷烃）（39%-102%）排放，但较低的THC（总烃）（9%-24%）、CH 4（甲烷）（23%-33%）和甲醛（14%-45%）排放。与稀燃公交车相比，具有TWC的化学计量发动机公交车显示出显著降低的NOx和THC排放，但确实显示出更高水平的CO（一氧化碳）和NH3（氨）。PM（颗粒物）质量排放没有表现出任何燃料的影响，而PN（颗粒数）排放表现出一些减少较高的WN气体。(C)2013爱思唯尔有限公司保留所有权利。
This study investigated the impacts of varying natural gas composition on the exhaust emissions from different technology transit buses. For this study, two CNG (compressed natural gas) buses equipped with lean burn combustion and OCs (oxidation catalysts), and one stoichiometric CNG bus equipped with a TWC (three-way catalyst) and EGR (exhaust gas recirculation) were tested on a chassis dynamometer over the CBD (Central Business District) cycle on six different gas blends each. The gases represented a range of compositions from gases with high levels of methane and correspondingly lower energy contents/WN (Wobbe number) to gases with higher levels of heavier hydrocarbons and correspondingly higher energy contents/WN. For the lean burn buses, gases with low methane contents exhibited higher NOx (nitrogen oxides) (19%-53%) and NMHC (non-methane hydrocarbon) (39%-102%) emissions, but lower emissions of THC (total hydrocarbon) (9%-24%), CH4 (methane) (23%-33%), and formaldehyde emissions (14%-45%). The stoichiometric engine bus with a TWC showed significantly reduced NOx and THC emissions compared to the lean burn buses, but did show higher levels of CO (carbon monoxide) and NH3 (ammonia). PM (particulate matter) mass emissions did not show any fuel effects, while PN (particle number) emissions exhibited some reductions for the higher WN gases. (C) 2013 Elsevier Ltd. All rights reserved.