公开(公告)号：US4026992A

公开(公告)日：1977-05-31

申请号：US627762

申请日：1975-10-31

申请人： Shujiro Shiga ,  Takeshi Katsumata ,  Eiji Inaba ,  Yasushi Okamoto ,  Atsushi Inmaru ,  Tsugio Nishioka ,  Takashi Nakata ,  Seiji Takaki

发明人： Shujiro Shiga ,  Takeshi Katsumata ,  Eiji Inaba ,  Yasushi Okamoto ,  Atsushi Inmaru ,  Tsugio Nishioka ,  Takashi Nakata ,  Seiji Takaki

IPC分类号： B01D53/60 ,  B01D53/74 ,  B01D53/94 ,  B01J23/28 ,  B03C3/017 ,  B01D53/34

CPC分类号： B01D53/9409 ,  B01D53/60 ,  B03C3/017

摘要： A method for removing nitrogen oxides from combustion exhaust gases obtained after removing sulfur oxides by a wet process, which is characterized in that the gases obtained after removing sulfur oxides from the combustion exhaust gases by a wet process are introduced into a wet electrostatic precipitator to remove most of the impurities such as dusts, fumes and mists, passed through a dummy catalyst layer in the form of a fixed bed or a moving bed to remove the remaining impurities which is set before or after heating the gases to a temperature suitable for the reaction of reducing nitrogen oxides, and passed through a metal oxides catalyst layer in the form of a fixed bed in the presence of ammonia which is used at least in the stoichiometric amount required for reducing nitrogen oxides to nitrogen gas by which the gases containing nitrogen oxides are reduced to harmless gases.

摘要翻译： 一种通过湿法除去硫氧化物后得到的燃烧废气中的氮氧化物的方法，其特征在于将通过湿法从燃烧废气中除去氧化硫后得到的气体引入湿式静电除尘器中以除去 大多数杂质如灰尘，烟雾和雾气通过固定床或移动床形式的虚拟催化剂层，以除去在将气体加热至适合于反应的温度之前或之后设置的剩余杂质 的还原氮氧化物，并且在氨的存在下通过固定床形式的金属氧化物催化剂层，所述氨在至少以用于将氮氧化物还原成氮氧化物所需的化学计量所需的化学计量量中使用，其中含有氮氧化物的气体是 减少到无害气体。