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

Abstract

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.

Keywords

hybrid system;NOx removal;SNCR;SCR

References

  1. H. Bosch and F. Janssen, Catal. Today, 2, 369 (1988). https://doi.org/10.1016/0920-5861(88)80002-6
  2. J. C. Choi, C. H. Cho, K. E. Jeong, J. K. Jeon, J. H. Yim, and Y. K. Park, J. Kor. Ind. Eng. Chem., 19, 92 (2008).
  3. L. C. Chen, Aerosol Air Quality Research, 6, 30 (2006). https://doi.org/10.4209/aaqr.2006.03.0003
  4. M. Dors and J. Mizeraczyk, Catal. Today, 89, 127 (2004). https://doi.org/10.1016/j.cattod.2003.11.031
  5. M. T. Javed, N. Irfan, and B. M. Gibbs, J. Env. Manage., 83, 251 (2007). https://doi.org/10.1016/j.jenvman.2006.03.006
  6. B. K. Gullet, W. G. Paul, M. L. Lin, and M. C. James, J. Air Waste Manage. Assoc., 44, 1188 (1994).
  7. P. W. Groff and B. K. Gullet, Env. Prog., 16, 116 (1997). https://doi.org/10.1002/ep.3300160217
  8. J. O. L. Wendt, W. P. Liank, P. W. Groff, and R. K. Srivastava, AIChE J., 47, 2603 (2001). https://doi.org/10.1002/aic.690471123
  9. L. J. Muzio, J. K. Arand, and D. P. Teiseira, Symp. on Combust., 16, 199 (1977).