Environmental Engineering Research

  • 제20권2호
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  • Pages.155-161
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  • 2015
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  • 1226-1025(pISSN)
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  • 2005-968X(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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Development of a variable resistance-capacitance model with time delay for urea-SCR system

  • Feng, Tan (Key Laboratory of High Performance Ship Technology of Ministry of Education, Wuhan University of Technology) ;
  • Lu, Lin (Key Laboratory of High Performance Ship Technology of Ministry of Education, Wuhan University of Technology)
  • 투고 : 2014.06.15
  • 심사 : 2015.04.14
  • 발행 : 2015.06.30
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초록

Experimental research shows that the nitric oxides ($NO_X$) concentration track at the outlet of selective catalytic reduction (SCR) catalyst with a transient variation of Adblue dosage has a time delay and it features a characteristic of resistance-capacitance (RC). The phenomenon brings obstacles to get the simultaneously $NO_X$ expected to be reduced and equi-molar ammonia available to SCR reaction, which finally inhibits $NO_X$ conversion efficiency. Generally, engine loads change frequently, which triggers a rapid changing of Adblue dosage, and it aggravates the air quality that are caused by $NO_X$ emission and ammonia slip. In order to increase the conversion efficiency of $NO_X$ and avoid secondary pollution, the paper gives a comprehensive analysis of the SCR system and tells readers the key factors that affect time delay and RC characteristics. Accordingly, a map of time delay is established and a solution method for time constant and proportional constant is carried out. Finally, the paper accurately describes the input-output state relation of SCR system by using "variable RC model with time delay". The model can be used for a real-time correction of Adblue dosage, which can increase the conversion efficiency of $NO_X$ in SCR system and avoid secondary pollution forming. Obviously, the results of the work discover an avenue for the SCR control strategy.

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참고문헌

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피인용 문헌

  1. Kinetic Modelling and Model based Control of SCR Deposit vol.82, pp.2261-236X, 2016, https://doi.org/10.1051/matecconf/20168201009