Nitrogen oxides removal characteristics of SNCR-SCR hybrid system

Jin Sun Cha, Sung Hoon Park, Jong Ki Jeon, Young Kwon Park

Research output: Contribution to journalArticlepeer-review


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∼950 °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 SRRES can be maintained at an appropriate level.

Original languageEnglish
Pages (from-to)658-663
Number of pages6
JournalApplied Chemistry for Engineering
Issue number6
StatePublished - Dec 2011


  • Hybrid system
  • NOx removal
  • SCR
  • SNCR


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