DOI QR코드

DOI QR Code

고압축비 전기점화 천연가스 발전용 엔진에서 앳킨슨 사이클 적용을 통한 열효율 향상

Improvement of Thermal Efficiency using Atkinson Cycle in a High-Compression Ratio, Spark-Ignition, Natural Gas Engine for Power Generation

  • 이준순 (한국기계연구원 모빌리티동력연구실) ;
  • 박현욱 (한국기계연구원 모빌리티동력연구실) ;
  • 오승묵 (한국기계연구원 모빌리티동력연구실) ;
  • 김창업 (한국기계연구원 모빌리티동력연구실) ;
  • 이용규 (한국기계연구원 모빌리티동력연구실) ;
  • 강건용 (한국기계연구원 모빌리티동력연구실)
  • 투고 : 2022.11.22
  • 심사 : 2023.01.26
  • 발행 : 2023.06.30

초록

Natural gas is a high-octane fuel that is effective in controlling knocking combustion. In addition, as a low-carbon fuel with a high hydrogen-carbon ratio, it emits less carbon dioxide and almost no particulate matter compared to conventional fossil fuels. Stoichiometric combustion engines equipped with a three-way catalyst are useful in various fields such as transportation and power generation because of their excellent exhaust emission reduction performance. However, stoichiometric combustion engines have a disadvantage of lower thermal efficiency compared to lean combustion engines. In this study, a combination of high compression ratio and Atkinson cycle was implemented in a 11 liter, 6-cylinder, spark-ignition engine to improve the thermal efficiency of the stoichiometric engine. As a result, pumping and friction losses were reduced and the operating range was extended with optimized Atkinson camshaft. Based on the exhaust gas limit temperature of 730℃, the maximum load and thermal efficiency were improved to BMEP 0.66 MPa and BTE 35.7% respectively.

키워드

과제정보

본 연구는 산업통상자원부의 제원으로 에너지수요관리 핵심기술개발 사업 "다중 분산발전 기반의 옥상온실형 스마트 그린빌딩 융복합 시스템 개발 및 실증" 과제(20212020800050)의 지원에 의해 수행되었으며 이에 감사드립니다.

참고문헌

  1. H. Park, J. Lee, S. Oh, C. Kim, Y. Lee and K. Kang, "Comparison of lean combustion performance in a spark-ignition engine fueled with natural gas and hydrogen," Journal of ILASS-Korea, Vol. 26, No. 4, 2021, pp. 204~211. https://doi.org/10.15435/JILASSKR.2021.26.4.204
  2. H. Park, J. Lee, S. Oh, C. Kim, Y. Lee and H. Jang, "Analysis on performance and emission with different diesel injection methods in a dual-fuel engine," Journal of ILASS-Korea, Vol. 27, No. 2, 2022, pp. 101~108. https://doi.org/10.15435/JILASSKR.2022.27.2.101
  3. M. I. Khan, T. Yasmin and A. Shakoor, "Technical overview of compressed natural gas (CNG) as a transportation fuel," Renewable and Sustainable Energy Reviews, Vol. 51, 2015, pp. 785~797. https://doi.org/10.1016/j.rser.2015.06.053
  4. H. Park, E. Shim, J. Lee, S. Oh, C. Kim, Y. Lee and K. Kang, "Large-squish piston geometry and early pilot injection for high efficiency and low methane emission in natural gas-diesel dual fuel engine at high-load operations," Fuel, Vol. 308, 2022, pp. 122015.
  5. H. Park, J. Lee, S. Oh, C. Kim, Y. Lee and K. Kang, "Analysis of Energy Losses in a Natural Gas Spark Ignition Engine for Power Generation," Journal of ILASS-Korea, Vol. 25, No. 4, 2020, pp. 170~177.
  6. Z. Wang, H. Liu and R. D. Reitz, "Knocking combustion in spark-ignition engines," Progress in Energy and Combustion Science, Vol. 61, 2017, pp. 78~112. https://doi.org/10.1016/j.pecs.2017.03.004
  7. J. Lee, Y. Lee, J. Kim, C. Kim, S. Oh, J. Lee, J. Jung and J. Cha, "Effects of engine cooling strategy on knock suppression in high-compression ratio spark-ignition engine," International Journal of Automotive Technology, Vol. 23, No. 2, 2022, pp. 367~378. https://doi.org/10.1007/s12239-022-0034-x
  8. J. Su, M. Xu, T. Li, Y. Gao and J. Wang, "Combined effects of cooled EGR and a higher geometric compression ratio on thermal efficiency improvement of a downsized boosted spark-ignition direct-injection engine," Energy Conversion and Management, Vol. 78, 2014, pp. 65~73. https://doi.org/10.1016/j.enconman.2013.10.041
  9. M. Cordier, O. Laget, F. Duffour, X. Gautrot and L. D. Francqueville, "Increasing modern spark ignition engine efficiency: a comprehension study of high CR and Atkinson cycle," SAE Technical paper, 2016, No. 2016-01-2172.
  10. K. Xing, H. Huang, X. Guo, Y. Wang, Z. Tu and J. Li, "Thermodynamic analysis of improving fuel consumption of natural gas engine by combining Miller cycle with high geometric compression ratio," Energy Conversion and Management, Vol. 254, 2022, 115219.