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    Exhaust gas purification process and apparatus with internal generation of ammonia for reducing nitrogen oxide
    8.
    发明授权
    Exhaust gas purification process and apparatus with internal generation of ammonia for reducing nitrogen oxide 失效
    废气净化工艺和装置内置氨气，用于还原氮氧化物

    公开(公告)号：US06338244B1

    公开(公告)日：2002-01-15

    申请号：US09520013

    申请日：2000-03-06

    申请人： Josef Guenther ,  Brititte Konrad ,  Bernd Krutzsch ,  Arno Nolte ,  Dirk Voigtlaender ,  Michel Weibel ,  Marko Weirich ,  Guenter Wenninger

    发明人： Josef Guenther ,  Brititte Konrad ,  Bernd Krutzsch ,  Arno Nolte ,  Dirk Voigtlaender ,  Michel Weibel ,  Marko Weirich ,  Guenter Wenninger

    IPC分类号： F01N300

    CPC分类号： F01N13/107 ,  B01D53/9431 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0878 ,  F01N3/206 ,  F01N13/009 ,  F01N2240/25 ,  F01N2610/02 ,  F02D41/008 ,  F02D41/0275 ,  F02D41/1475

    摘要： A method and apparatus for purifying an exhaust gas of an internal combustion engine includes an ammonia generating catalyst for generating ammonia from nitrogen oxides contained in the exhaust gas to be purified, and a nitrogen oxide reducing catalyst downstream of the ammonia generating catalyst, for reduction of nitrogen oxides contained in the exhaust gas to be purified. Generated ammonia is used as the reducing agent. A nitrogen oxide adsorption catalyst is arranged upstream of the ammonia generating catalyst, or the ammonia generating catalyst is arranged in an exhaust pipe branch which pertains to only a part of several separately controllable internal-combustion sources. One or more additional exhaust pipe branches assigned to the other internal-combustion sources and lead to the nitrogen oxide reducing catalyst, while bypassing the ammonia generating catalyst. The part of the internal-combustion sources pertaining to the exhaust pipe branch of which contains the ammonia generating catalyst is operated either continuously or intermittently in a rich mode. Also, one or more combustion sources which feed their exhaust gas to the nitrogen oxide adsorption catalyst may be operated alternately in a lean and rich mode.

    摘要翻译： 用于净化内燃机的排气的方法和装置包括用于从待净化的废气中包含的氮氧化物产生氨的氨生成催化剂和在氨生成催化剂下游的氮氧化物还原催化剂，用于还原 包含在待净化废气中的氮氧化物。 生成的氨用作还原剂。 氮氧化物吸附催化剂布置在氨发生催化剂的上游，或者氨生成催化剂被布置在排气管分支中，该排气管分支仅涉及几个可独立控制的内燃源的一部分。 分配给其它内燃源的一个或多个另外的排气管分支，并通过氮氧化物还原催化剂，同时绕过氨发生催化剂。 与其排气管分支相关的含有氨生成催化剂的内燃源的一部分以富模式连续地或间歇地运行。 而且，将其排气供给至氮氧化物吸附催化剂的一个或多个燃烧源可以以贫富浓模式交替操作。