Dürr Environmental Inc.

SCR System

Selective Catalytic Reduction (SCR) Systems are designed for for high combustion temperatures of over 1100 °C in the combustion chamber (thermal NOx), and if nitrogen is contained in the fuel (fuel NOx). It is a reducing agent injected into the flue gas at temperatures of 260 to 390 °C. Suitable substances are, depending on customer's requirements, gaseous ammonia, ammonia water or urea. The subsequent process is the selective conversion of NOx and NH3 and/or NH2 (as the case may be) to N2 and H2O.