Method and apparatus for reducing the nitrogen oxides in flue gas

摘要

Combustion systems have a combustion apparatus, heating surfaces downstream of the combustion apparatus in a flue gas stream, and a deNOx catalyst. A method for reducing nitrogen oxides in the flue gas of the combustion systems includes selectively assigning the deNOx catalyst to a position inside and a position outside the flue gas stream as a function of a nitrogen oxide concentration or of a selected energy carrier. An apparatus for reducing nitrogen oxides in the flue gas of the combustion system includes a device for selectively assigning the deNOx catalyst to a position inside and a position outside a line through which the flue gas flows.