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A Study on the Effects of EGR with Syngas Addition in a Gasoline Engine  

Yun, Young-Jun (Korea University of Science & Technology)
Choi, Young (Korea Institute of Machinery and Materials)
Kang, Kern-Yong (Korea Institute of Machinery and Materials)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.15, no.6, 2007 , pp. 159-164 More about this Journal
Abstract
The purpose of this study is to reduce harmful emission gases in the range of stable combustion without loss of a thermal efficiency. Therefore, effects of both exhaust gas recirculation(EGR) and synthetic gas addition on engine performance and emission were investigated in a gasoline engine. Synthetic gas(syngas), which is in general prepared from reforming gasoline, was utilized in order to promote stable combustion. The major components of syngas are H2, CO and $N_2$ gases. The percentage of syngas addition was changed from 0 to 30% in energy fraction and EGR rate was varied up to 30%. As a result, $COV_{IMEP}$ as a parameter of combustion stability was decreased and THC/$NO_X$ emissions were reduced with the increase of syngas addition. And $COV_{IMEP}$ was increased with the increase of EGR but $NO_X$ emission was greatly reduced. In addition, under the region where the EGR rate is around 20%, thermal efficiency was improved.
Keywords
Exhaust gas recirculation; Synthetic gas; Combustion stability; Thermal efficiency$NO_X$;
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