Nature protection technologies

1.1.3.1 Selective Catalytic Reduction (SCR)

Part 1. AIR PROTECTION FROM POWER INDUSTRY EMISSIONS

1.1. Nitrogen oxide emission reduction

1.1.3. Flue gas cleaning from nitrogen oxides

1.1.3.1 Selective Catalytic Reduction (SCR)

Kotler V.R., Open JSC “VTI”

This method is currently the most effective tool for NOx emission reduction, applied at the large power boilers. The method has been used for a long time at power plants in Europe, USA and Japan.

The reducing agent (for that purpose ammonia or urea is usually used) is injected into the flue gas stream before the catalyst. Near the catalyst surface in the temperature range of 170 ... 510°C at a different level of intensity, the reducing reactions, resulting in nitrogen oxide transformation into the molecular nitrogen, occur.