METHOD OF SELECTIVE CATALYTIC CLEANING OF EXHAUST GASES FROM NITROGEN OXIDES IN INDUSTRIAL PLANTS Russian patent published in 2007 - IPC B01D53/56 B01D53/86 C01B21/20 

FIELD: cleaning exhaust gases from nitrogen oxides in industrial plants by means of selective catalytic cleaning with the use of ammonia.

SUBSTANCE: proposed method includes reduction of nitrogen oxides by ammonia on catalyst in presence of hydrogen. Before delivery to catalyst, exhaust gases are mixed with purge gases from the ammonia synthesis cycle. Content of hydrogen in mixture is maintained below low limit of ignition. Purge gases are enriched with ammonia by mixing them with ammonia synthesis gases.

EFFECT: reduced consumption of ammonia; enhanced mixing of exhaust gases with ammonia; reduced emissions of ammonia into atmosphere; reduced power requirements.

2 cl