DENITRATION METHOD OF EXHAUSTED GAS FROM BOILER AND THE LIKE

摘要

PURPOSE:To remove nitrogen oxides in exhausted gas without using catalyst through the mechanism wherein a reducing gas is introduced into a high temperature portion of a boiler and an electric dissociation radioactive ray is irradiated at a low temperature portion. CONSTITUTION:Into the high temperature exhausted gas which is generated by combustion in a boiler 3, an ammonia gas is introduced from an introducing part 10 at the high temperature portion in front of the introducing portion 32 and the denitration reaction of nitrogen monoxide in the exhausted gas is promoted. Thereafter ultraviolet ray is irradiated at the photochemical reaction portion 38 by a ultraviolet lamp 37 and the residual nitrogen oxide is reacted the ammonia and converted to nitrogen. At this time, an introducing amount of ammonia gas is controlled according to the concentration of nitrogen monoxide so as to enhance the denitration efficiency.