Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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Numerical study on effect of intake valve timing on characteristics of combustion and emission of Natural gas-Diesel engine

발전용 천연가스-디젤 혼소 엔진의 흡기밸브 개폐시기에 따른 연소 및 배출 특성에 대한 수치 해석적 연구

  • Jung, Jaehwan (The Graduate schoold, Dept. of Mechanical Engineering, Yonsei University) ;
  • Song, Soonho (Dept. of Mechanical Engineering, Yonsei University) ;
  • Hur, Kwang beom (Korea Electric Power Corporation, KEPRI)
  • 정재환 (연세대학교 기계공학과 대학원) ;
  • 송순호 (연세대학교 기계공학과) ;
  • 허광범 (한국전력공사 전력연구원)
  • Received : 2016.04.04
  • Accepted : 2016.06.16
  • Published : 2016.06.30
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Abstract

In this study, diesel/natural gas dual-fuel engine was studied numerically using DoE method. The engine is CI engine for power generation and modelled by 1-D simulation GT-power. The combustion and emission characteristics were analyzed as a function of IVO, IVC and the ratio of natural gas to total fuel enegy. As the proportion of natural gas increases, the BSFC(Brake specific fuel consumption) is increased and BSNOx(Brake specific NOx) is decreased. If specific valve timing to improve the BSFC is applied to the engine, the BSFC is decreased by 1% and simultaneously BSNOx is decreased by 36%.

도시지역에서는 발전용 디젤엔진의 운영비를 절약하기 위해 천연가스와 디젤을 섞어서 쓰려는 노력을 하고 있다. 본 연구에서는 디젤 연료의 일부를 천연가스로 대체 하였을 때 엔진특성과 천연가스로 대체되는 양에 따라 최적의 밸브 타이밍을 찾아보았다. 1-D 엔진 해석프로그램을 사용하여 19.7리터 발전용 디젤 엔진을 대상으로 모델링하여 연구를 진행하였다. 연구 결과 엔진연료에서 천연가스 비율이 증가할수록 연료소비율(Brake Specific Fuel Consumption, BSFC)는 증가하였고 질소산화물(Brake Specific NOx)는 감소하였다. 추가적으로 흡기밸브 타이밍을 조절할 경우 BSFC가 최대 1%감소하였고 BSNOx의 경우 최대 36%감소하는 효과가 있었다.

Keywords

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