Nitrogen Oxides Removal Characteristics of SNCR-SCR Hybrid System

SNCR-SCR 하이브리드 시스템의 질소산화물 제거 특성

  • Cha, Jin Sun (School of Environmental Engineering, University of Seoul) ;
  • Park, Sung Hoon (Department of Environmental Engineering, Sunchon National University) ;
  • Jeon, Jong-Ki (Department of Chemical Engineering, Kongju National University) ;
  • Park, Young-Kwon (School of Environmental Engineering, University of Seoul)
  • 차진선 (서울시립대학교 환경공학부) ;
  • 박성훈 (순천대학교 환경공학과) ;
  • 전종기 (공주대학교 화학공학부) ;
  • 박영권 (서울시립대학교 환경공학부)
  • Received : 2011.08.19
  • Accepted : 2011.09.14
  • Published : 2011.12.10


The SNCR-SCR (selective non-catalytic reduction-selective catalytic reduction) hybrid system is an economical NOx removal system. In this study, the effect of the operating parameters of the SNCR-SCR hybrid system on NOx removal efficiency was investigated. When the SNCR reactor was operated at a temperature lower than the optimum temperature ($900{\sim}950^{\circ}C$), an additional NO removal is obtained basesd on the utilization of $NH_3$ slip. On the other hand, the SNCR reactor operated above the temperature resulted in no additional NO removal of SCR due to decomposition of $NH_3$. Therefore, the SNCR process should be operated at optimum temperature to obtain high NO removal efficiency and low $NH_3$ slip. Thus, it is important to adjust NSR (normalized stoichiometric ratio) so that $SR_{RES}$ can be maintained at an appropriate level.


hybrid system;NOx removal;SNCR;SCR


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