公开(公告)号：US09310075B2

公开(公告)日：2016-04-12

申请号：US13264516

申请日：2010-04-14

申请人： Pasi Mikkulainen ,  Lauri Pakarinen

发明人： Pasi Mikkulainen ,  Lauri Pakarinen

IPC分类号： B09B3/00 ,  F23J15/00 ,  B01D53/56 ,  F22B21/34 ,  F22B21/40

CPC分类号： F23J15/003 ,  B01D53/56 ,  B01D2251/2062 ,  B01D2251/2067 ,  F22B21/341 ,  F22B21/40 ,  F23G2209/101 ,  F23J2215/101 ,  Y02P80/154

摘要： 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.

摘要翻译： 本发明涉及一种用于减少锅炉烟道气中的氮氧化物的量的方法和锅炉，该燃料和空气的燃烧产生烟道气。 锅炉具有水循环系统，其包括过热器（8）和用于燃烧燃料并用于产生含有氮氧化物的烟道气（1）的炉（1），该烟道气主要在炉中向上流动，并进一步向过热区域通过其他 将锅炉的热回收表面排出锅炉，并将氮氧化物还原剂引入烟道气中。 重要的是，在过热器区之前将氮氧化物还原剂引入烟道气中，在此之前，烟道气的温度通过位于烟气流中的至少一个热交换器（15）而降低 在引入还原剂的上游，用于在烟道气流中获得合适的温度窗口以减少氮氧化物。