Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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A Numerical Study on Performance of a Heavy-Duty Diesel engine for Power Generation under Natural Gas-Diesel Dual Fuel Operation

발전용 대형 디젤 엔진의 천연가스-디젤혼소 운전 특성에 대한 수치해석 연구

  • Cho, Jungkeun (The Graduate school, Dept. of Mechanical engineering, Yonsei University) ;
  • Park, Sangjun (The Graduate school, Dept. of Mechanical engineering, Yonsei University) ;
  • Song, Soonho (Dept. of Mechanical engineering, Yonsei University) ;
  • Hur, Kwang-Beom (Korea Electric Power Research Institute)
  • 조정근 (연세대학교 기계공학과 대학원) ;
  • 박상준 (연세대학교 기계공학과 대학원) ;
  • 송순호 (연세대학교 기계공학과) ;
  • 허광범 (한국전력 공사 전력연구원)
  • Received : 2015.01.28
  • Accepted : 2015.04.16
  • Published : 2015.04.30
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Abstract

This study is an 1-D numerical study prior to modification of diesel engine for power plants to natural gas/diesel dual fuel engine using GT-Power with 1.5MW diesel engine for power generation. Natural gas injector was installed to intake manifold for dual fuel engine model. Effects on engine performance and characteristics were investigated when dual fuel is used in unmodified diesel engine. The analysis was done under 5 conditions from 0% to 40% of mixing rate on 720RPM engine speed. As a result of research, the engine performance was decreased as increasing ratio of natural gas. Engine brake power was decreased by 18.4% under 40% mixing rate condition. To clarify the reason, effects of injection timing and period were evaluated with DOE method. Considering this result, optimization was done for these parameters. Also, comparison between performances of dual fueled engine and diesel engine was made after optimizing the timing of injection by DOE method. As a result, engine brake power was decreased by 8.55% under mixing rate 40% condition showing 12.5% improvement.

본 연구는 발전용 디젤 엔진을 천연가스/디젤 혼소 엔진으로 개조하기 위한 선행 연구로 1.5MW급 발전용 디젤 엔진을 대상으로 상용 프로그램인 GT-Power를 이용해 수치해석을 진행하였다. 흡기 포트에 천연가스 분사 장치를 추가한 수치해석 모델을 통해 기존 엔진에서 천연가스와 디젤을 혼소시킬 경우 엔진 성능에 미치는 영향과 특성에 대해 분석하였다. 엔진 속도 720RPM, 혼소율 0%~40%까지 5개 조건에서 수치해석을 진행했다. 연구 결과 혼합 연소 시 천연가스의 비율이 증가할수록 출력이 감소하는 경향을 보였으며 혼소율 40%에서 출력이 18.4% 감소하였다. 이에 따라 실험계획법(Design of Experiment)을 통해 연료 분사시기와 연료 분사 기간에 대한 영향을 분석했다. 또한 이러한 영향을 고려해 연료 분사시기와 분사기간을 최적화시켜 혼소 엔진 출력과 디젤 엔진의 출력을 비교하여 혼소엔진으로의 개조에 따른 엔진의 출력과 효율에 대한 변화를 정량적으로 도출하였다. 그 결과 혼소율 40%에서 엔진 출력은 8.55% 감소하여 최적화 이전에 비해 12.5%의 개선 효과를 보였다.

Keywords

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