Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Basis Study on the Optimal Design of the Integrated PM/NOx Reduction Device

일체형 PM/NOx 동시저감장치의 최적 설계에 대한 기초 연구

  • Choe, Su-Jeong (Division of Marine System Engineering, Korea Maritime and Ocean University) ;
  • Pham, Van Chien (Korea Maritime and Ocean University) ;
  • Lee, Won-Ju (Division of Marine System Engineering, Korea Maritime and Ocean University) ;
  • Kim, Jun-Soo (Korea Institute of Maritime and Fisheries Technology) ;
  • Kim, Jeong-Kuk (Division of Marine System Engineering, Korea Maritime and Ocean University) ;
  • Park, Hoyong (Advanced Ship Research Division, Korea research institute of ship & ocean engineering Advanced Ship Research Division) ;
  • Lim, In Gweon (CATech Inc.) ;
  • Choi, Jae-Hyuk (Division of Marine System Engineering, Korea Maritime and Ocean University)
  • 최수정 (한국해양대학교 기관시스템공학과) ;
  • ;
  • 이원주 (한국해양대학교) ;
  • 김준수 (한국해양수산연수원) ;
  • 김정국 (한국해양대학교 기관시스템공학과) ;
  • 박호용 (선박해양플랜트연구소 선박연구본부) ;
  • 임인권 ((주)씨에이테크) ;
  • 최재혁 (한국해양대학교)
  • Received : 2022.09.29
  • Accepted : 2022.10.28
  • Published : 2022.10.31
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Abstract

Research on exhaust aftertreatment devices to reduce air pollutants and greenhouse gas emissions is being actively conducted. However, in the case of the particulate matters/nitrogen oxides (PM/NOx) simultaneous reduction device for ships, the problem of back pressure on the diesel engine and replacement of the filter carrier is occurring. In this study, for the optimal design of the integrated device that can simultaneously reduce PM/NOx, an appropriate standard was presented by studying the flow inside the device and change in back pressure through the inlet/outlet pressure. Ansys Fluent was used to apply porous media conditions to a diesel particulate filter (DPF) and selective catalytic reduction (SCR) by setting porosity to 30%, 40%, 50%, 60%, and 70%. In addition, the ef ect on back pressure was analyzed by applying the inlet velocity according to the engine load to 7.4 m/s, 10.3 m/s, 13.1 m/s, and 26.2 m/s as boundary conditions. As a result of a computational fluid dynamics analysis, the rate of change for back pressure by changing the inlet velocity was greater than when inlet temperature was changed, and the maximum rate of change was 27.4 mbar. This was evaluated as a suitable device for ships of 1800kW because the back pressure in all boundary conditions did not exceed the classification standard of 68mbar.

대기오염물질과 온실가스 배출량을 저감 시키기 위한 배기 후처리 장치에 대한 연구는 활발히 진행 중이지만 그 중 선박용 입자상물질/질소산화물(PM/NOx) 동시저감 장치에서는 엔진에 미치는 배압 및 필터 담체 교체에 대한 문제가 발생하고 있다. 본 연구에서는 PM/NOx를 동시저감 할 수 있는 일체형 장치의 최적 설계를 위해 장치 내부 유동과 입·출구 압력을 통한 배압의 변화를 연구하여 적절한 기준을 제시하였다. Ansys Fluent를 활용하여 디젤미립자필터(DPF) 및 선택적촉매환원법(SCR)에 다공성 매체 조건을 적용하였고 공극률은 30 %, 40 %, 50 %, 60 % 및 70 %로 설정하였다. 또한, 엔진 부하에 따른 Inlet 속도를 경계 조건으로 7.4 m/s, 10.3 m/s, 13.1 m/s 및 26.2 m/s로 적용하여 배압에 미치는 영향을 분석하였다. CFD 분석 결과, 장치의 입구 온도 보다 입구 속도에 따른 배압의 변화율이 크고 최대 변화율은 27.4 mbar였다. 그리고 모든 경계 조건에서의 배압이 선급 기준인 68 mbar를 초과하지 않았기 때문에 1800 kW 선박에 적합한 장치로 평가되었다.

Keywords

Acknowledgement

이 논문은 2022년 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구임(2MW급 디젤선박용 일체형 방식 PM/NOx 동시저감장치 기술개발).

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