Ammonia Slip De-NOx

DeNOX is the conversion of NO and NO2 - two hazardous nitrogen oxides known generically as NOX - to nitrogen and water. Plants are required to run this process in order to restrict NOX emissions below allowable limits.

The efficiency and operational cost of this process hinge heavily on adequate process monitoring, specifically measurement of NOX and ammonia slip downstream from the reaction.

It is important to continue to measure the concentrations of NH3 and NOX in the outlet gas downstream from DeNOX in order to keep a vigilant watch on NOX reduction efficiency, catalyst problems, excess/insufficient ammonia injection, and potential maintenance issues from ammonium bisulfate formation.