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A Study of the characteristics of NOx measurement and analysis methods of the SCR system for ships

선박용 SCR 시스템 NOx 측정 및 분석 방식의 특성 연구

  • Kim, Sung-Yoon (Department of Atmospheric Environment, Korea Marine Equipment Research Institute) ;
  • Lee, Young-Ho (Department of Mechanical Engineering, Korea Marine And Ocean University) ;
  • Kim, Min (Department of Atmospheric Environment, Korea Marine Equipment Research Institute) ;
  • Park, Sam-Sik (Test and Research Bu, NANO)
  • Received : 2015.03.16
  • Accepted : 2015.03.26
  • Published : 2015.05.31

Abstract

A method for measuring and analyzing the $NO_x$ in ships is described in $NO_x$ Technical Code 2008. The analysis device, as required by the Code, has been to use a Chemi-luminescence detection method or Heated Chemi-luminescence detection. on the other hand, selective catalytic reduction using $NH_3$ as a reducing agent has an interference effect on the analyzer, and causes measurement error. In this study, the Chemi-luminescence detection method was examined according to how it affects the concentration of $O_2$, CO, $SO_2$, $NH_3$. Fourier transform infrared spectrometry analysis equipment and measurement methods were compared. In order to confirm the effect of the physical interference of the measuring device, it was confirmed by decomposing a measuring device. Consequently, white precipitate and moisture were generated inside the chemiluminescence detection system and I found that affecting interference. The influence of interference highlights the need to consider the minimized $NO_x$ measurement method.

선박에서 발생하는 질소산화물($NO_x$)을 측정하고 분석하는 방법은 $NO_x$ Technical Code 2008에 기재되어 있다. 코드를 만족하는 분석 방법으로는 화학 발광 분석법과 가열 화학 발광 분석법이 있다. 그러나 환원제로 $NH_3$가 사용되는 선택적 촉매 환원 분석 방법은 환원제로 인한 간섭 현상이 발생하여 측정 오차를 일으킨다. 본 연구에서는 화학 발광 분석방식의 여러 가지 가스와의 간섭 영향을 분석하고 어떤 특성을 가지는지 확인하였다. 그리고 푸리에 변환 적외석 분광 분석 장비 및 측정 방법을 통하여 비교하였다. 또한 측정 장비의 물리적 간섭 영향을 확인하기 위하여 측정 장비를 분해하여 확인하였다. 그 결과로써, 화학발광검출기기 내부에 발생한 백색 침전물과 수분이 간섭에 영향을 미친다는 것을 알 수 있었다. 간섭의 영향을 최소화할 수 있는 $NO_x$ 측정 방법을 검토할 필요가 있다.

Keywords

References

  1. IMO MEPC 66/21, Report of the marine environment protection committee on its sixty-sixth session, 2014.
  2. IMO MEPC 65/4/7, Final report of the Correspondence Group on Assessment of Technological Developments to Implement the Tier III NOx Emission Standards under MARPOL Annex VI, 2013.
  3. IMO Res. MEPC 198(62), 2011 Guidelines addressing additional aspects to the NOx technical Code 2008 with regard to particular requirements related to marine diesel engines fitted with Selective Catalytic Reduction (SCR) systems, 2011.
  4. IMO, NOx Technical Code Appendix 3, 2008.