Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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An Experimental Study on Lean-burn Limit and Emission Characteristics of Air-fuel Ratio in a CNG Engine

수소-CNG 혼소기관의 공기과잉률 변화에 따른 희박가연한계 및 배출가스 특성에 관한 연구

  • KIM, INGU (Transportation Pollution Research Center, National Institute of Environmental Research) ;
  • SON, JIHWAN (Transportation Pollution Research Center, National Institute of Environmental Research) ;
  • KIM, JOUNGHWA (Transportation Pollution Research Center, National Institute of Environmental Research) ;
  • KIM, JEONGSOO (Transportation Pollution Research Center, National Institute of Environmental Research) ;
  • Lee, Seong-Uk (Department of Automotive Engineering, Kookmin University) ;
  • KIM, SUNMOON (Transportation Pollution Research Center, National Institute of Environmental Research)
  • 김인구 (국립환경과학원 교통환경연구소) ;
  • 손지환 (국립환경과학원 교통환경연구소) ;
  • 김정화 (국립환경과학원 교통환경연구소) ;
  • 김정수 (국립환경과학원 교통환경연구소) ;
  • 이성욱 (국민대학교 자동차공학과) ;
  • 김선문 (국립환경과학원 교통환경연구소)
  • Received : 2017.01.09
  • Accepted : 2017.04.30
  • Published : 2017.04.30
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Abstract

Recently, the world faces the environmental problem such as air pollution due to harmful gas discharged from car and abnormal climate due to the green-house gases increased by the discharge of $CO_2$. Compressed Natural Gas (CNG), one of alternative for this problem, is less harmful, compared to the existing fossil fuel, as gaseous fuel, and less carbon in fuel ingredients and carbon dioxide generation rate relatively favorable more than the existing fuel. However, CNG fuel has the weakness of slow flame propagation speed and difficult fast burn. On the other hand, hydrogen does not include carbon in fuel ingredients, and does not discharge harmful gas such as CO and HC. Moreover, it has strength of quick burning velocity and ignition is possible with small ignition energy source and it's has wide Lean Flammability Limit. If using this hydrogen with CNG fuel, the characteristics of output and discharge gas is improved by the mixer's burning velocity improved, and, at the same time, is possible to have stable lean combustion with the reduction of $CO_2$ expected. Therefore, this research tries to identify the characteristics of engine and emission gas when mixing CNG fuel and hydrogen in each portion and burning them in spark igniting engine, and grasp the lean combustion limit and emission gas characteristics according and use it as the basic data of hydrogen-CNG premixed engine.

Keywords

References

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