A method of reducing flue gas emissions and a boiler

B - Operations – Transporting – 01 – D

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B01D 53/56 (2006.01) F23J 15/00 (2006.01)

Patent

CA 2758878

The present invention relates to a method and a boiler for decreasing the amount of nitrogen oxides in flue gases of a boiler, which flue gases are generated in the combustion of fuels and air. The boiler has a water circulation system comprising superheaters (8) and a furnace (1) for combustion of fuel and for generating flue gases that contain nitrogen oxides, which flue gases mainly flow upwards in the furnace and further to the superheater zone and via other heat recovery surfaces of the boiler out of the boiler, and a nitrogen oxides reducing agent is introduced into the flue gases. It is essential that the nitrogen oxides reducing agent is introduced into the flue gases prior to the superheater zone, before which the temperature of the flue gases is decreased by means of at least one heat exchanger (15) that is located in the flue gas flow upstream of the introduction of the reducing agent, for obtaining a suitable temperature window in the flue gas flow in order to reduce nitrogen oxides.

La présente invention concerne un procédé et une chaudière conçus pour réduire la quantité d'oxydes d'azote contenus dans les gaz de carneau d'une chaudière, lesquels gaz de carneau sont produits lors de la combustion de combustibles et d'air. Cette chaudière comporte un système de circulation d'eau comprenant des surchauffeurs et un foyer servant à la combustion de combustible et à la production de gaz de carneau contenant des oxydes d'azote. Ces gaz de carneau remontent dans le foyer, arrivent dans la zone des surchauffeurs, et sortent de la chaudière en passant le long de surfaces de récupération de chaleur de la chaudière. En outre, un agent réducteur des oxydes d'azote est introduit dans les gaz de carneau. L'un des traits caractéristiques de l'invention est que l'agent réducteur des oxydes d'azote est introduit dans les gaz de carneau avant la zone du surchauffeur, zone avant laquelle la température des gaz de carneau a été abaissée par au moins un échangeur de chaleur placé dans le courant de gaz de carneau en amont du point d'introduction de l'agent réducteur, ce qui permet de maintenir le courant de gaz de carneau dans une plage de températures convenant à la réduction des oxydes d'azote.

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