Treatment of process gases containing halogenous compounds
    21.
    发明授权
    Treatment of process gases containing halogenous compounds 失效
    处理含有卤素化合物的工艺气体

    公开(公告)号:US5481063A

    公开(公告)日:1996-01-02

    申请号:US776403

    申请日:1991-11-22

    摘要: The present invention relates to a method of treating various chlorine-containing materials such as wastes, biological sludges and even metal concentrates in a circulating fluidized bed reactor (1) or a grate furnace at a high temperature of over 830.degree. C. and of cooling the resultant process gases for minimizing the amount of polyhalogenated aromatic compounds in the process gases. The process gases are cooled to a temperature below 250.degree. C. at a cooling velocity exceeding 1000.degree. C. per second. Cooling is preferably effected in a circulating fluidized bed reactor (2).

    摘要翻译: PCT No.PCT / FI90 / 00134 Sec。 371日期1991年11月22日 102(e)1991年11月22日日期PCT提交1990年5月16日PCT公布。 出版物WO90 / 14559 日本1990年11月29日。本发明涉及在循环流化床反应器(1)或高炉过程中的炉排炉中处理各种含氯物质如废物,生物污泥甚至金属浓缩物的方法。 并冷却所得到的工艺气体,以使工艺气体中的多卤代芳族化合物的量最小化。 将工艺气体以超过1000℃/秒的冷却速度冷却到低于250℃的温度。 冷却优选在循环流化床反应器(2)中进行。

    Method of purifying gases containing nitrogen oxides and an apparatus
for purifying gases in a steam generation boiler
    22.
    发明授权
    Method of purifying gases containing nitrogen oxides and an apparatus for purifying gases in a steam generation boiler 失效
    纯化含氮氧化物的气体的方法和蒸汽发生锅炉中的气体净化装置

    公开(公告)号:US5465690A

    公开(公告)日:1995-11-14

    申请号:US226483

    申请日:1994-04-12

    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.degree. C.), while the second stage is a catalytic stage (e.g. at temperatures of about 300.degree.-400.degree. 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 NH.sub.3 (or other reducing agent) slip in the exhausted flue gases. Heat transfers in a convection section as 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。 用于建立稳定的催化还原温度条件的对流段中的热传递。