Inject ammonia gas to the location with a temperature of 280℃to 420 ℃ in the tail flue of the boiler. The ammonia gas is used as reducing agent, and it’s fully mixed with the flue gas. Under the function of certain catalyst, reducing agent selectively restores the NO and NO2 in the flue gas into non-toxic, non-polluting N2 and H2O, thus removing the NOX in the flue gas.
The main reactions are as follows:
Main technique indexes and requirements:
Denitration efficiency should be more than 90%
Ammonia escape should be less than 3ppm
Oxygenation rate of SO2 or SO3 should be less than 1%
System resistance should be less than 1000Pa