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Lean Operation Characteristics of a Spark Ignition Engine with Reformed Gas Addition  

Oh, Seung-Mook (Engine Research Center, Korea Institute of Machinery and Materials)
Kim, Chang-Up (Engine Research Center, Korea Institute of Machinery and Materials)
Kang, Kern-Yong (Engine Research Center, Korea Institute of Machinery and Materials)
Choi, Young (Engine Research Center, Korea Institute of Machinery and Materials)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.3, 2006 , pp. 170-177 More about this Journal
Abstract
Hydrogen can extend the lean misfire limit to a large extent when it is mixed with conventional fuels for a spark ignition engine. In this study, hydrogen-enriched gaseous fuels by reforming process were simulated according to their proportions of $H_2$, CO, $CO_2$ and $N_2$ gases. Pure hydrogen and two different hydrogen-enriched gaseous mixtures(A-, B-composition) were tested for their basic effects on the engine performances and emissions in a single cylinder research engine. A- and B-composition showed different results from 100% $H_2$ addition because air/fuel mixtures were more diluted by their additions. Even though the energy fraction of reformed gases was increased, combustion stabilities and lean misfire limits were not sensitively improved. It means that combustion augmentation by $H_2$ addition was offset by the charge dilution of $N_2$ and $CO_2$. In addition, the low flammability of CO gas deteriorated thermal efficiencies. CO emission was drastically increased with B-composition which included higher CO component. However, $NO_x$ was reduced as energy fraction($X_e$) rised except for the case of 100% $H_2$ addition at $\lambda=1.2$ and was, for A-composition, lowered to a factor of ten when compared with that of $H_2$ addition. HC emissions were largely influenced by $COV_{imep}$ due to misfire and partial burns.
Keywords
Reformed gas; Hydrogen enrichment; Lean burn; Lean misfire limit; Single cylinder engine; Nitric oxides;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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