Characterization of NOx Removal Through Ammonia Addition

摘要

A new NO control technology has been described by Lyon and Longwell which selectively removes NO from combustion effluent gases through homogeneous reactions with ammonia and oxygen. The process is different from conventional NO abatement techniques since it does not prevent or limit NO formation but rather removes the NO through reaction in the post combustion gases. Since the process does not differentiate between thermal and fuel NO, and selectively removes NO after its formation, it reduces both thermal and fuel NOx. The present paper is concerned with characterizing the selective reduction of NO through the addition of NH sub 3 to the post combustion gases. The study was undertaken in a laboratory scale combustion tunnel that supports steady state reproducible combustion under a variety of operating conditions. Propane fuel was premixed with air and the prototype fuel nitrogen compound, NO, prior to combustion. Experimental variables considered in the study are: (1) equivalence ratio, (2) NO concentration prior to ammonia addition, (3) temperature of the combustion products prior to ammonia addition, and (4) ammonia concentrations added to the product gases. Results are analyzed in terms of NO survival yields. The characterization process for the selective reduction of NO through reaction with NH sub 3 added to the post combustion gases has involved kinetic studies, laboratory scale combustor studies and demonstration studies in utilities, and these provide different but complementary information. (ERA citation 04:044729)