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Study on Emission Characteristics in a Hydrogen-fueled Engine  

Cho, U.L. (Grad. School of Keimyung Univ.)
Ghoi, G.H. (Department of Automotive engineering, Keimyung Univ.)
Bae, S.C. (Department of Automotive engineering, Keimyung Univ.)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.13, no.1, 2002 , pp. 83-89 More about this Journal
Abstract
The goal of this research is to understand the NOx emission in direct injected diesel engine with premixed hydrogen fuel. Hydrogen fuel was supplied into the test engine through the intake pipe. Amount of hydrogen-supplemented fuel was 70 % basis on heating value of the total input fuel. The effects of intake air temperature and exhaust gas recirculation(EGR) on NOx emission were studied. The intake air temperatures were varied from $23^{\circ}C$ to $0^{\circ}C$ by using liquid nitrogen. Also, the exhaust gas was recirculated to the intake manifold and the amount of exhaust gas was controlled by the valve. The major conclusions of this work include: ( i ) nitrogen concentrations in the intake pipe were increased by 30% and cylinder gas temperature was decreased by 24% as the intake air temperature were changed from $23^{\circ}C$ to $0^{\circ}C$; ( ii ) NOx emission per unit heating value of supplied fuel was decreased by 45% with same decrease of intake air temperature; and (iii) NOx emission was decreased by 77% with 30% of EGR ratio. Therefore, it may be concluded that EGR is effective method to lower NOx emission in hydrogen fueled engine.
Keywords
Hydrogen-fueled engine; Exhaust gas recirculation; Intake air temperature; Nitrogen concentration; Unit heating value;
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