NOx Control (SNCR)
Selective Non-Catalytic Reduction is a post-combustion technology that is designed to control nitrogen oxides (NOx) emissions from boilers by the injection of ammonia or urea reagents into the flue gas.
Hamon Research-Cottrell is licensed by Exxon Mobil for the application of ammonia based Thermal DeNox™ (TDN).
The key to the SNCR process is optimization of reagent injection with the flue gas within a specific temperature window. For urea this window is approximately 1800°F-2100°F (982°C-1149°C). For ammonia the window is slightly lower at 1600°F-1800°F (871°C-982°C). The temperature window can be effectively shifted to a lower range by the co-injection of hydrogen with ammonia.
Selective Non-Catalytic Reduction offers lower capital equipment cost and is extremely versatile for medium levels of NOx control. SNCR can be combined with other upstream and downstream NOx control technologies. SNCR is applied in many industries including, Power, Steel, Pulp and Paper, Petrochemical, Waste-to-Energy, Glass and others.