E101 DME-LPG混合燃料のガスエンジンマイクロコージェネへの適応研究(OS-4 省エネルギー・小型分散電源・コジェネ技術,一般講演,地球温暖化防止と動力エネルギー技術)

概要

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Recently DME is focused as alternative fuel because DME could be made from natural gas, bio-mass gas and coal. Now DME is investigated fuel for Diesel engine because Cetane number of DME is almost as same as light oil. On the other hand, DME can be blended with LPG because characteristic of DME is similar as LPG. LPG is usually used as gas fuel for small gas engine, cooking equipment and stove. LPG small gas engine drives generator and heat pump system. If mixture fuel of DME and LPG can be used instead of LPG in the market, energy security will be safe in the world. However, the knocking limit of DME is very low comparing LPG because the auto ignition temperature of DME is almost as same as light oil. This research is investigated on knocking limit of mixture fuel of DME and LPG on each ratio of DME. The test engine is natural aspirated small spark ignition gas engine which is used for micro cogeneration system. The bore size of test engine 88mm and stroke is 96mm. The displacement of the test engine is about 1.6 liter. The engine speed is 1500 min^<-1>. The result showed that the knocking limit using DME mixture fuel could be improved by retarded ignition timing and A/F ratio under the limit of blend ratio without EGR is less than 30%. The limit of DME blend ratio should be less than 40% by retarded ignition timing and controlling EGR ratio in improvement of knocking limit.
一般社団法人日本機械学会の論文
2008-06-18