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    EXHAUST EMISSION CONTROL SYSTEM FOR LEAN ENGINES AND METHOD FOR OPERATING THE SYSTEM
    1.
    发明申请
    EXHAUST EMISSION CONTROL SYSTEM FOR LEAN ENGINES AND METHOD FOR OPERATING THE SYSTEM 审中-公开
    排气发动机排气控制系统及运行系统的方法

    公开(公告)号：US20100037597A1

    公开(公告)日：2010-02-18

    申请号：US12519989

    申请日：2007-12-21

    申请人： Stephan Eckhoff ,  Ulrich Goebel ,  Susanne Philipp ,  Wilfried Mueller ,  Thomas Kreuzer

    发明人： Stephan Eckhoff ,  Ulrich Goebel ,  Susanne Philipp ,  Wilfried Mueller ,  Thomas Kreuzer

    IPC分类号： F01N9/00 ,  F01N3/023 ,  F01N3/10

    CPC分类号： F01N3/0814 ,  F01N3/0842 ,  F01N3/0871 ,  F01N3/2073 ,  F01N13/009 ,  F01N13/0097 ,  F01N13/011 ,  F01N2570/18 ,  F01N2610/03 ,  F02D41/0082 ,  F02D41/0275 ,  Y02T10/24

    摘要： An emission control system for the cleaning of the exhaust gases of a lean burn engine with two or more cylinders comprises a first exhaust leg for the exhaust gases of a first group of cylinders and a second exhaust leg for the exhaust gases of a second group of cylinders. A nitrogen oxide storage catalyst is arranged in each exhaust leg. The two exhaust legs are combined downstream of the storage catalysts at a confluence to form a common exhaust leg. The common exhaust leg contains an SCR catalyst. The first and second groups of cylinders are each supplied alternately in periodic intervals with lean and rich air/fuel mixtures. Lean or rich exhaust gases are thus obtained in the combustion in the cylinders and released into the corresponding exhaust legs. Lean and rich exhaust gases are adjusted with respect to one another so as to result in a lean exhaust gas after the combination of the exhaust gases in the common exhaust leg. The regeneration of the storage catalysts may result in the formation of ammonia, which is stored by the SCR catalyst and reacted with nitrogen oxides which pass through the storage catalysts in an unwanted manner during the storage phases.

    摘要翻译： 用于清洁具有两个或多个气缸的稀薄燃烧发动机的废气的排放控制系统包括用于第一组气缸的排气的第一排气支管和用于第二组气缸的废气的第二排气支管 气瓶。 在每个排气支管中设置氮氧化物储存催化剂。 两个排气支路在汇合处在储存催化剂的下游组合以形成共同的排气支路。 普通排气支架含有SCR催化剂。 第一组和第二组汽缸分别以稀薄和浓缩的空气/燃料混合物以周期性间隔交替供应。 因此，在气缸中的燃烧中获得精益或浓缩的废气，并将其排放到相应的排气支管中。 精益和丰富的废气相对于彼此进行调节，以便在共同排气支路中排出的废气组合之后产生贫乏的废气。 储存催化剂的再生可导致氨的形成，其由SCR催化剂储存并与在储存阶段期间以不期望的方式通过储存催化剂的氮氧化物反应。

    METHOD AND DESULFURIZING NITROGEN OXIDE STORAGE CATALYSTS IN THE EXHAUST GAS SYSTEM OF A LEAN MIX ENGINE
    2.
    发明申请
    METHOD AND DESULFURIZING NITROGEN OXIDE STORAGE CATALYSTS IN THE EXHAUST GAS SYSTEM OF A LEAN MIX ENGINE 审中-公开
    炼油发动机排气系统中氮氧化物储存催化剂的方法与脱硫

    公开(公告)号：US20100064665A1

    公开(公告)日：2010-03-18

    申请号：US12520606

    申请日：2007-12-19

    申请人： Stephan Eckhoff ,  Susanne Philipp ,  Wilfried Mueller ,  Thomas Kreuzer

    发明人： Stephan Eckhoff ,  Susanne Philipp ,  Wilfried Mueller ,  Thomas Kreuzer

    IPC分类号： F01N9/00 ,  F01N3/00 ,  F01N3/10

    CPC分类号： F02D41/028 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0885 ,  F01N3/101 ,  F01N3/106 ,  F01N3/2033 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/04 ,  F01N13/107 ,  F01N2430/06 ,  F01N2430/08 ,  F01N2430/085 ,  F01N2560/025 ,  F01N2560/14 ,  F02D41/0082 ,  Y02T10/22 ,  Y02T10/26

    摘要： Lean burn engines require an exhaust gas system comprising nitrogen oxide storage catalysts for removal of nitrogen oxides from their exhaust gases. When the lean burn engine is operated with a sulphur-containing exhaust gas, the storage catalysts have to be desulphurized from time to time. During the desulphurization, there is the risk of high pollutant emissions. These emissions can be reduced when the cylinders of the lean burn engine are combined in two groups which release their exhaust gas to two assigned exhaust legs, in each of which is arranged at least one nitrogen oxide storage catalyst. The two exhaust legs are combined beyond the storage catalysts to form a common exhaust leg which contains a catalyst which possesses a three-way function under stoichiometric conditions. The two nitrogen oxide storage catalysts are desulphurized offset in time with respect to one another. While rich exhaust gas at a high temperature flows through one storage catalyst for desulphurization, lean exhaust gas flows through the second storage catalyst, in such a way that the combined exhaust gas is of stoichiometric composition over the entire desulphurization period. Under the stoichiometric conditions, the catalyst with three-way function is capable of converting hydrocarbons, carbon monoxide and nitrogen oxides to harmless components.

    摘要翻译： 精益燃烧发动机需要包括用于从其废气中除去氮氧化物的氮氧化物储存催化剂的废气系统。 当贫燃机用含硫废气进行操作时，必须不时地将储存催化剂脱硫。 在脱硫过程中，存在污染物排放高的风险。 当贫燃发动机的气缸组合成两组时，可以减少这些排放物，这两组燃烧器将废气排放到两个分配的排气支路，每个排放管排列有至少一个氮氧化物储存催化剂。 两个排气支路结合在储存催化剂之外以形成一个共同的排气支管，它包含一个在化学计量条件下具有三通功能的催化剂。 两种氮氧化物储存催化剂相对于彼此在时间上被脱硫。 虽然高温下的废气通过一个用于脱硫的储存催化剂流过，贫废气以这样的方式流过第二储存催化剂，使得组合废气在整个脱硫周期内具有化学计量组成。 在化学计量条件下，具有三向功能的催化剂能够将碳氢化合物，一氧化碳和氮氧化物转化为无害成分。