Investigation on the regulated and unregulated emissions of a DME engine under different injection timing
Investigation on the regulated and unregulated emissions of a DME engine under different injection timing
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DOI：
10.1016/j.applthermaleng.2011.08.015
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发表时间：
2012-03
影响因子：
6.4
通讯作者：
Ziliang Zhu;Lin Dechao;Jiazeng Liu;Yuhao Wei;S-H Liu
中科院分区：
文献类型：
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作者：
Ziliang Zhu;Lin Dechao;Jiazeng Liu;Yuhao Wei;S-H Liu
在这项研究中，一台两缸直喷压燃式发动机改装成使用二甲醚(DME)燃料。研究了不同供油时刻下二甲醚发动机的总烃(THC)、一氧化碳(CO)、氮氧化物(NOx)、烟度、二甲醚和甲醛(CH2O)的排放特性，并与柴油机进行了比较。采用脉冲放电氦电离检测器(PDHID)气相色谱仪测定二甲醚和CH2O的排放，用MEXA 7100°Horiba进行检测。测试结果表明，二甲醚和CH2O是二甲醚发动机排放的主要成分。并且，由于这两种排放对火焰电离检测器(FID)的响应通常较小，因此应该对FID的DME发动机排放进行校正。与柴油机相比，二甲醚发动机可以实现无烟排放，并显著降低THC和NOx的排放。在中低转速下，二甲醚发动机的CO排放也有所降低。两种燃料的CH2O排放量大致相同。延迟DME喷油时刻，NOx排放进一步降低，而CO、THC、DME和CH2O排放增加。
In this study, a two-cylinder, direct injection compression ignition engine was retrofitted to run on dimethyl ether (DME) fuel. Under different fuel delivery timing, total hydrocarbon (THC), carbon monoxide (CO), nitrogen oxides (NOx), smoke, DME and formaldehyde (CH2O) emission characteristics of DME engine were investigated and compared with diesel engine. A gas chromatograph with pulsed discharge helium ionization detector (PDHID) was applied to measure the exhausted DME and CH2O, and the regulated emissions were detected with MEXA 7100 DEGR, Horiba. The measurement proved that DME and CH2O are the main components of THC emission from DME engine. And, for the reason that these two emissions are normally less responded by flame ionization detector (FID), the DME engine THC emission of FID should be corrected. Compared with diesel engine, DME engine can achieve smoke-free and significant lower THC and NOxemissions. CO emission of DME engine is decreased at low and middle engine speed conditions as well. CH2O emissions for both fuels are approximately equal. Retarding DME injection timing, NOx emission can be further reduced, while the increase of CO, THC, DME and CH2O emission are observed.