Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Prediction of NOx emission for marine gas engines

선박용 가스엔진의 NOx 배출량예측에 관한 연구

  • Jang, Ha-Seek (Graduate school, Korea Maritime & Ocean University) ;
  • Lee, Ji-Woong (Korea Institute of Maritime & Fisheries Technology) ;
  • Lee, Kang-Ki (Department of Offshore Plant Management, Korea Maritime & Ocean University) ;
  • Choi, Jae-Sung (Division of Marine Engineering, Korea Maritime University)
  • Received : 2014.03.06
  • Accepted : 2014.07.07
  • Published : 2014.07.31
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Abstract

Natural gas for marine diesel engine is considered as an important and clean source of energy because of simultaneously reducing the emission of NOx, SOx and GHG. Especially with a appearance of shale gas, the using of natural gas has been investigated aggressively and expected to expand rapidly. By the reports, gas engine and diesel engine were both in a similar performance in the power aspect, and the SFOC of gas engine was shown a little better than that of diesel engine. But the characteristics of exhaust gas emission were different according to various combustion technologies. And with lean burn technology, the emission of NOx could be reduced to 85% lower than that of diesel engine. In this paper, it was described that a simulation program has been developed to predict NOx emission. The developed program is adopted two-zone model and Wiebe function for combustion in cylinder. The effects of premixed and diffusive combustion could be simulated by using the excess air ratio as input data. And it was confirmed that the results of simulation were agreed with the general trends of exhaust gas emission according to various combustion conditions such as lean burn, premixed and diffusive combustion.

선박용 디젤엔진에서 천연가스의 사용기술은 NOx, SOx 및 GHG의 배출을 단독으로 크게 삭감할 수 있는 기술이다. 특히 셰일가스의 등장으로 가스의 공급이 확대될 것으로 예상되는 가운데 추진기관용 2행정기관에의 이용이 적극적으로 개발 검토되고 있다. 가스엔진의 출력성능은 디젤기관과 비교하여 큰 차이를 보이지 않았으며 연료소비율은 약간 개선되는 것으로 보고되고 있다. 그러나 배기특성에 있어서는 연소기술에 따라서 다른 성능을 나타내고 있으며 희박연소기술에 의하여 NOx 배출량은 85%정도의 감축이 가능한 것으로 알려져 있다. 본 연구에서는 가스엔진의 연소생성물의 발생량을 시뮬레이션 할 수 있는 프로그램을 개발하였다. 개발된 프로그램은 희박연소의 영향은 물론 예혼합연소와 확산연소에 의한 영향도 시뮬레이션 할 수 있는 기능을 가지고 있다. 이를 위해서 실린더 내 상태변화는 2영역모델(Two-zone model)을 이용하고 열발생율 패턴은 Wiebe 함수를 이용하며, 공연비를 입력데이터로 하여 다양한 연소조건에서의 배기생성물의 발생량 예측을 가능하게 하였다.

Keywords

References

  1. L. M. Nerheim and R. Nordrik, "Bergen gas engine developments", Proceedings of 24th CIMAC International Congress on Combustion Engines, no. 71, 2004.
  2. B. Thijssen, "Dual-fuel-electric LNG carrier propulsion", The Royal Institution of Naval Architects from their Design and Operation of Gas Carriers Conference, 2004.
  3. A. Tsunoda, K. Horimoto, Y. Osaka, M. Ogawa, and T. Noguchi, "Further development of advanced gas engine KU30GA (MACH-30G)", Proceedings of 24th CIMAC International Congress on Combustion Engines, no. 71, 2004.
  4. K. Tanaka, Y. Matsushita, T. Fujiwaka, and T. Noguchi, "Development of the lean burn miller cycle gas engine", Proceedings of 24th CIMAC International Congress on Combustion Engines, no. 71, 2004.
  5. G. Herdin and F. Gruber, "Miller cycle - efficiency potentials for gas engines", Proceedings of 24th CIMAC International Congress on Combustion Engines, no. 71, 2004.
  6. D. Y. Jung, J. S Kim, J. T. Kim, E. S. Kim, and A. S. Carter, "Development of high efficient gas engine H35/40G", Proceedings of 24th CIMAC International Congress on Combustion Engines, no. 71, 2004.
  7. L. R. Juliussen, M. J. Kryger, and A. Andreasen, "Man B&W Me-Gi engines. recent research and results", Proceedings of International Symposium of Marine Engineering, 2011.
  8. N. Kagiwata and O. Hanashima, "Gas engine and its lubrication - unresolved phenomena in lubrication and their Claifications(2)", Journal of Japan Institute of Marine Engineering, vol. 42, no. 3, pp. 109-118, 2007. (in Japanese).
  9. K. Yamanaka, S. Nishioka, Y. Shiraga, and S. Nakai, "Development of pre-chamber spark plug for gas engine", Proceedings of 24th CIMAC International Congress on Combustion Engines, no. 71, 2004.
  10. L. Haraldson, "LNG as a fuel for environmentally friendly shipping retrofit perspective", 33rd Motorship Propulsion & Emissions Conference Copenhagen, 2011.
  11. K. Takasaki, "Observations on the development and practical application of marine gas engines", ClassNK TECHNICAL BULLETIN, 2012.
  12. J. I. Ramos, Internal Combustion Engine Modeling, New York, Hemisphere, 1989.
  13. S. J. Jeong, T. H. Kim, and H. S. Jang, "The prediction of performance in two-stroke large marine diesel engine using double-wiebe combustion model", Journal of the Korean Society of Marine Engineering, vol. 23, no. 5, PP. 638-640, 1999 (in Korean).
  14. C. R. Ferguson, Internal Combustion Engines Applied Thermosciences, Singapore, Jhon Wiley & Sons, 1986.
  15. W. J. D. Annand, "Heat transfer in the cylinders of reciprocating internal combustion engines", Proceedings of Institute Mechnical Engineering, vol. 177, no. 36, p. 973, 1963.
  16. B. Y. Bae, J. G. Nam, and J. S. Choi, "A study on the calculation of NO formation in cylinder for diesel engines", Journal of the Korean Society of Marine Engineering, vol. 23, no. 4, PP. 543-551, 1999 (in Korean).
  17. S. W. Kim, A Study on Prediction of NOx Emission from Marine Main Diesel Engine for Existing Ship, M.S. Theses, Depart. of Marine System Engineering, Korea Maritime and Ocean University, Korea, 2011 (in Korean).

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