대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제35권9호
  • /
  • Pages.869-874
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  • 2011
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  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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CNG/Diesel 이종연료용 엔진의 성능 및 배출가스 특성에 대한 연구

Study on Performance and Emission Characteristics of CNG/Diesel Dual-Fuel Engine

  • 임옥택 (울산대학교 기계자동차공학부)
  • Lim, Ock-Taeck (Dept. of Mechanical and Automotive Engineering, Ulsan Univ.)
  • 투고 : 2010.07.05
  • 심사 : 2011.08.02
  • 발행 : 2011.09.01
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초록

CNG/diesel dual-fuel 엔진은 CNG 를 주 연료로 사용하고 소량의 디젤을 착화제로서 실린더 내에 분사한다. 본 연구에서는 기존의 디젤엔진을 커먼레일직접분사(CRDI)를 통하여 고압으로 디젤을 분사하고, 예혼합을 위하여 CNG 를 흡기포트에 분사하는 CNG/diesel dual-fuel 엔진으로 개조하였다. CNG/diesel dualfuel engine 은 기존의 디젤엔진과 동등한 수준의 토크 및 출력성능을 나타내었다. 또한, CNG 대체율은 CNG/diesel dual-fuel 엔진의 전체 운전영역에 대하여 89% 이상을 만족시켰다. Dual-fuel 엔진의 PM 배출농도는 디젤엔진보다 94% 더 낮게 나타났지만, NOx 배출농도는 더 높게 나타났다.

In a CNG/diesel dual-fuel engine, CNG is used as the main fuel and a small amount of diesel is injected into the cylinder to provide ignition priming. In this study, a remodeling of the existing diesel engine into a CNG/diesel dual-fuel engine is proposed. In this engine, diesel is injected at a high pressure by common rail direct injection (CRDI) and CNG is injected at the intake port for premixing. The CNG/diesel dual-fuel engine had an equally satisfactory coordinate torque and power as the conventional diesel engine. Moreover, the CNG alternation rate is over 89% throughout the operating range of the CNG/diesel dual-fuel engine. PM emission by the dual-fuel engine is 94% lower than that by the diesel engine; however, NOx emission by the dual-fuel engine is higher than that by the diesel engine.

키워드

참고문헌

  1. Lee, J., Pyo, Y., Kwon, O., Lee, Y., Na, P., Ryu, J. and Lee, Y., 2006, "Performance and Emission Characteristics of a Diesel Pilot Compression Ignition CNG Engine," KSAE paper 06-S0300.
  2. Yoon, S., Heo, S. and Roh, Y., 2008, "Characteristics of Dual Fuel System for Diesel Engine and Vehicle driving," KSAE paper 08-S0076.
  3. Shen, J., Qin, J. and Yao, M., 2003, "Turbocharged diesel/CNG Dual-fuel Engines with Intercooler: Combustion, Emissions and Performance," SAE paper 2003-01-3082.
  4. Addy, J. M., Bining, A., Norton, P., Peterson, E., Campbell, K. and Bevillaqua, O., 2000, "Demonstration of Caterpillar C10 Dual Fuel Natural Gas Engines in Commuter Buses," SAE paper, 2000-01-1386.
  5. Johnson, W. P., Beck, N. J., Lovkov, O., Koshkin, V. K. I., Piatov, S. and van der Lee, A., 1990, "All Electronic Dual Fuel Injection System for the Belarus D-144 Diesel Engine," SAE paper, 901502.