De-NOx SCR catalyst removes the NOx contained in exhaust gases discharging from power plants, industrial boilers, ships, incinerators, chemical plants and diesel automobiles etc.
SCR Catalyst
SCR (Selective catalytic reduction) is a typical De-NOx technology which deoxidizes NOx to Nitrogen on the surface of catalyst. Ammonia and Urea are used for reductant and then NOx is reduced to Nitrogen and water at lower temperature due to the SCR catalyst. This technology has been widely used in industrial facility since it showed a high reduction rate of NOx up to 90%.
SCR Reaction Mechanism
Comparison of De-NOx Technology
Technology
SCR
SNCR
Low Nox Burner
Outline
- Inject NH3 to the catalyst- reduce NOx
- Inject UREA/NH3- NOx reduction without catalyst
- Combustion method- Lower oxygen concentration and flame temperature
NOx removal rate
70~90%
25~50%
30~50%
Investment
High
Low
Medium
Operation Expense
Medium
High
Low
Consideration
- Installallation space- Catalyst removal and replacement
- Stucture of combustion furnace- Residence time of reductant
- Fan capacity- Stability of flame
Overall Evaluation
- Applied to medium & large facility
- Restrict the operation condition- Existing customer unsatifaction factors
- Suitable for small facility- Existing the limited NOx removal rate
Comparison of air regulation invarious countries
SCR (Selective Catalytic Reduction)
Description
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