Experimental investigation on the combustion and exhaust emission characteristics of biogas-biodiesel dual-fuel combustion in a CI engine

被引:239
|
作者
Yoon, Seung Hyun [2 ]
Lee, Chang Sik [1 ]
机构
[1] Hanyang Univ, Sch Mech Engn, Seoul 133791, South Korea
[2] Hanyang Univ, Grad Sch, Seoul 133791, South Korea
关键词
Alternative fuel; Biogas; Biodiesel; Compression ignition engine; Dual-fuel combustion; Exhaust emissions; NOX EMISSIONS; DIESEL; IMPACT; BLENDS;
D O I
10.1016/j.fuproc.2010.12.021
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
An experimental investigation was performed to study the influence of dual-fuel combustion characteristics on the exhaust emissions and combustion performance in a diesel engine fueled with biogas-biodiesel dual-fuel. In this work, the combustion pressure and the rate of heat release were evaluated under various conditions in order to analyze the combustion and emission characteristics for single-fuel (diesel and biodiesel) and dual-fuel (biogas-diesel and biogas-biodiesel) combustion modes in a diesel engine. In addition, to compare the engine performances and exhaust emission characteristics with combustion mode, fuel consumption, exhaust gas temperature, efficiency, and exhaust emissions were also investigated under various test conditions. For the dual-fuel system, the intake system of the test engine was modified to convert into biogas and biodiesel of a dual-fueled combustion engine. Biogas was injected during the intake process by two electronically controlled gas injectors, which were installed in the intake pipe. The results of this study showed that the combustion characteristics of single-fuel combustion for biodiesel and diesel indicated the similar patterns at various engine loads. In dual-fuel mode, the peak pressure and heat release for biogas-biodiesel were slightly lower compared to biogas-diesel at low load. At 60% load, biogas-biodiesel combustion exhibited the slightly higher peak pressure, rate of heat release (ROHR) and indicated mean effective pressure (IMEP) than those of diesel. Also, the ignition delay for biogas-biodiesel indicated shortened trends compared to ULSD dual-fueling due to the higher cetane number (CN) of biodiesel. Significantly lower NOx emissions were emitted under dual-fuel operation for both cases of pilot fuels compared to single-fuel mode at all engine load conditions. Also, biogas-biodiesel provided superior performance in reductions of soot emissions due to the absence of aromatics, the low sulfur, and oxygen contents for biodiesel. Crown Copyright (c) 2011 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:992 / 1000
页数:9
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