DOI QR코드

DOI QR Code

Effect of nozzle diameter on the reduction of smoke emission from naval ship diesel engines

함정용 디젤엔진의 노즐 직경 변화가 매연 발생에 미치는 영향

  • Son, Min-Soo (Department of Marine System Engineering Graduate School, Korea Maritime and Ocean University) ;
  • Choi, Jae-Sung (Division of Marine Engineering, Korea Maritime and Ocean University) ;
  • Cho, Kwon-Hae (Department of Offshore Plant Management, Korea Maritime and Ocean University)
  • Received : 2015.11.03
  • Accepted : 2016.03.21
  • Published : 2016.03.31

Abstract

Legislative and regulatory actions regarding the exhaust gas from ships are being strengthened by both international organizations and national governments, to protect human health and the environment. Exhaust gas traps are excluded from exhaust gas regulation applications, but, recently, the United States, Britain, and other developed countries have examined a variety of ways to improve the system, including the introduction of electric propulsion systems to prevent air pollution generated by naval ships. This study investigates a large number of smoke problems of naval diesel engines to verify the effect of improving the nozzle characteristics. An exhaust gas emission measurement method to determine the quality of pollutant exhaust gas generated during low-load operation is proposed through the research methodology of the smoke problem. It was confirmed that the emissions value is improved by decreasing the nozzle hole diameter and increasing the injection pressure. At the same time, the flow rate decrease equation and setting up a test memo based on the nozzle diameter confirmed that the fuel consumption, to which the nozzle diameter in the flow path is related, is reduced.

국제기구 및 각국의 정부는 인간의 건강 및 환경을 보호하기 위해 선박의 배기가스 규제를 엄격히 적용하고 있다. 함정은 이러한 배기가스 규제 적용 대상에서 제외되고 있지만 최근 미국, 영국 등 일부 선진국에서는 함정으로 야기되는 대기환경오염을 방지하기 위해 전기추진체계 시스템을 도입하는 등 다양한 개선 방법을 적용하고 있다. 본 연구에서는 함정용 디젤엔진의 매연 발생 문제 해결을 위해 노즐 직경을 축소 변화시키고 분사압력을 증가시켜 배기가스 발생량 측정과 오염물질조사 방법론을 이용해 저부하시 매연 문제가 개선된 것을 확인하였다. 동시에 그 영향을 유량방정식과 함정시험평가서를 통해 노즐 직경 축소 결과 연료 소비량이 감소되는 것을 확인하였다.

Keywords

References

  1. A. Al-Sened and E. R. Karimi, "Strategies for NOx Reduction on Heavy Duty Engine," CIMAC Congress, pp. 272-280, 2001.
  2. J. S. Choi and H. J. Jeon, A Lecture of Internal Combustion Engine, Hyosung, pp. 506-509, 2004 (in Korean).
  3. H. M. Lee and R. E. Park, "Emission prediction from naval ship main propulsive diesel engine under steady navigation," Journal of the Korean Society of Marine Engineering, vol. 36, no. 6, pp.788-793, 2012 (in Korean). https://doi.org/10.5916/jkosme.2012.36.6.788
  4. G. Y. Goo, A study on the effcet of atomization characteristics according to nozzle hole geometry for diesel engine, M.S. Thesis, Department of Mechanical Engineering, Kyungpook National University, Korea, 2008 (in Korean).
  5. J. J. Corbett and H. W. Koehler, "Updated emissions from ocean shipping," Journal of Geophysical Research, vol. 108, no. D20, pp. ACH 9-1, 2003.
  6. K. H. Lee, Effect of Fuel Injection Nozzle Internal Geometry on the Spray Characteristics, M.S. Thesis, Pusan National University, Department of Mechanical and Material System, Korea, 2014 (in Korean).
  7. J. Y. Kim, W. H. Yoon, and J. S. Ha, "A study on the numerical prediction of heat release rate and NOx production in medium-speed marine diesel engine," ASME ICED/RTD Fall Conference, pp. 137, 2003.
  8. M. G. Kang, S. J. Kwon, J. P. Cha, Y.K. Lim, S. W. Park, and C. S. Lee, "Effect of air/fuel ratio on combustion characteristics in a compression ignition engine fueled with biodiesel," 42th KOSCO symposium, pp. 325-330, 2011.