Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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A Study on the Optimization of Combustion and Emission Performance in a Heavy-duty HCNG Engine

Heavy-duty HCNG엔진의 연소 및 배기성능 최적화에 관한 연구

  • Choi, Young (Dept. of Engine Research, Korea Institute of Machinery and Materials) ;
  • Park, Chul-Woong (Dept. of Engine Research, Korea Institute of Machinery and Materials) ;
  • Won, Sang-Yeon (Dept. of Engine Research, Korea Institute of Machinery and Materials) ;
  • Kim, Chang-Gi (Dept. of Engine Research, Korea Institute of Machinery and Materials)
  • Received : 2011.03.01
  • Accepted : 2011.04.25
  • Published : 2011.04.30
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Abstract

Although CNG is able to meet the current emission standards, it is expected to be impossible to satisfy the requirements of the next EURO-6 emission regulation without an additional after-treatment device. Hydrogen is known to be a gaseous fuel which features the wide flammability limit and the fast reactivity. A certain amount of hydrogen addition to CNG is able to extend the lean combustion range and produce lesser amounts of harmful emissions. In this research, the combustion and emission characteristics of HCNG(mixture of Hydrogen and CNG) fuel were experimented in an 11-liter heavy duty lean burn engine varying hydrogen contents, air-to-fuel ratio and spark timing. The optimization of this HCNG engine for a city bus was performed through the evaluations of oxidation catalyst characteristics.

도심 대기오염을 줄이고자 도입된 CNG 버스는 현재의 배기규제 기준을 만족시켜 도시 대기환경 개선에 많은 기여를 했지만 추가적인 후처리 장치의 도움 없이는 차기 배기기준인 유로6 배기규제를 만족시키기 매우 어렵다. 수소는 매우 활발하고 빠른 반응성을 가지고 있으며 희박가연한계 또한 매우 넓어 기존 연료와 함께 사용 시 개선된 연소 및 배기성능을 기대할 수 있다. 따라서 본 연구에서는 시내버스용 대형 CNG 엔진에 수소를 일정 부분 CNG와 혼합한 HCNG 연료를 공급하여 희박연소를 시킴으로서 연소 및 배기성능을 개선하는 실험을 수행하였다. 수소혼합비율, 공연비, 점화시기 변화에 따른 연소 및 배기성능을 살펴보고 최적운전조건을 찾아내었으며 산화촉매 성능평가를 통해 11리터 버스용 HCNG 엔진의 상용화 가능성을 검토하였다.

Keywords

References

  1. K. Collier, N. Mulligan, D. Shin and S. Brandon, "Emission results from the new development of a dedicated hydrogen- enriched natural gas heavy duty engine", SAE technical paper, 2005, SAE 2005-01-0235
  2. R. Sierens, E. Rosseel, "Variable composition hydrogen/natural gas mixtures for increased engine efficiency and decreased emissions", Trans. of ASME, J. of Engineering for Gas Turbines and Power, Vol. 122, 2000, pp. 135-140 https://doi.org/10.1115/1.483191
  3. M. Fanhua, W. Yu, L. Haiquan, L. Yong, W. Junjun and Z. Shuli, "Experimental study on thermal efficiency and emission characteristics of a lean burn hydrogen enriched natural gas engine", Int. J. of Hydrogen Energy, Vol. 32, 2007, pp. 5067-5075 https://doi.org/10.1016/j.ijhydene.2007.07.048
  4. A. S. Orhan, D. Zafer, K. Nafiz and V. T. Nejat, "Internal combustion engines fueled by natural gashydrogen mixture", Int. J. of Hydrogen Energy, Vol. 29(14), 2004, pp. 1527-1539 https://doi.org/10.1016/j.ijhydene.2004.01.018
  5. P. Kavathekar, D. Rairikar, S. Thipse, "Development of a CNG injection engine compliant to EUROIV Norms and development strategy for HCNG operation", SAE technical paper, 2007, SAE 2007-26-029
  6. C. Kukkonen, M. Shelef, "Hydrogen as a alternative fuel : 1993 update", SAE technical paper, 1994, SAE 940766
  7. 전흥신, 최영, "자동차공학", 도서출판 인터비젼, 2007, pp. 598-610
  8. B. Heywood, "Internal combustion engine fundamentals", McGraw-Hill, 1988