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1. 发明申请

WO1995027554A1 A METHOD OF PURIFYING GASES CONTAINING NITROGEN OXIDES AND AN APPARATUS FOR PURIFYING GASES IN A STEAM GENERATION BOILER 审中-公开
标题翻译：含有氮氧化物的气体的方法和用于在蒸汽发生炉中净化气体的装置
公开(公告)号：WO1995027554A1
公开(公告)日：1995-10-19
申请号：PCT/FI1995000207
申请日：1995-04-12
申请人： A. AHLSTROM CORPORATION
发明人： A. AHLSTROM CORPORATION , HILTUNEN, Matti , LEE, Yam , VIEL LAMARE, Charles
IPC分类号： B01D53/56
CPC分类号： F23C10/10 , B01D53/56 , B01D53/8625 , F23J15/02 , F23J2215/10 , F23J2219/10 , F23J2219/20
摘要： A method of reducing the nitrogen oxide level in the flue gases issuing from combustion units by introduction of reducing agents into contact with gases containing nitrogen oxides in first and second reducing stages, is provided. The first reducing stage is a non-catalytic stage (e.g. at temperatures over 800 DEG C), while the second stage is a catalytic stage (e.g. at temperatures of about 300-400 DEG C). A steam generation boiler with improved nitrogen reduction facilities is also provided. The amount of nitrogen oxides in the hot gases is reduced in the combination of the first and second reducing stages while producing steam in a steam generation boiler system, thus resulting in gases essentially free from nitrogen oxides while eliminating the possibility of NH3 (or other reducing agent) slip in the exhausted flue gases. Heat transfers in a convection section are used to establish stabilized temperature conditions for catalytic reduction.
摘要翻译：提供了一种通过在第一和第二还原阶段通过引入还原剂与含有氮氧化物的气体接触来降低从燃烧单元排出的烟道气中的氮氧化物含量的方法。第一还原阶段是非催化阶段（例如在800℃以上的温度），而第二阶段是催化阶段（例如在约300-400℃的温度）。还提供了具有改进的氮还原设备的蒸汽发生锅炉。在第一和第二还原阶段的组合中，在蒸汽发生锅炉系统中产生蒸汽的同时，热气中的氮氧化物的量减少，从而导致基本上不含氮氧化物的气体，同时消除了NH 3（或其它还原试剂）在耗尽的烟道气中滑移。使用对流段中的热传递建立稳定的催化还原温度条件。

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