Exhaust gas purification system for an internal combustion engine
    2.
    发明公开
    Exhaust gas purification system for an internal combustion engine 失效
    动物生物学报Enenenenage Verbrennungsgase eines internen Verbrennungsmotors。

    公开(公告)号:EP0441401A1

    公开(公告)日:1991-08-14

    申请号:EP91101802.6

    申请日:1991-02-08

    IPC分类号: F01N3/20

    摘要: An exhaust gas purification system for an internal combustion engine includes an engine (1) capable of fuel combustion at lean air-fuel ratios, a lean NOx catalyst (3) installed in an exhaust conduit (16) of the engine, an HC producing means (2, 4, 6, 11, 15, 21, 22, 23, 24, 25, 26, 30, 32) for producing hydrocarbons of low boiling points utilizing fuel for the engine, and an HC supply means (7, 8, 9, 10, 13, 27, 28, 29) for supplying the hydrocarbons of low boiling points to the exhaust conduit (16) upstream of the lean NOx catalyst (3). NOx reduction reaction needs hydrocarbons of low boiling points. The HC producing means produces hydrocarbons of low boiling points from diesel oil by cracking, fractional distillation, or both cracking and fractional distillation. The cracked and/or distilled fuel includes a large amount of hydrocarbons of low boiling points and increases NOx purification rate of the lean NOx catalyst (3) when the hydrocarbons of low boiling points are introduced into the exhaust conduit (3) by the HC supply means.

    摘要翻译: 用于内燃机的废气净化系统包括能够以稀空燃比燃料燃烧的发动机(1),安装在发动机的排气管道(16)中的贫NOx催化剂(3),HC产生装置 (2,4,6,11,15,21,22,23,24,25,26,30,32),用于使用发动机的燃料生产低沸点烃;以及HC供应装置 9,10,13,27,28,29),用于向贫NOx催化剂(3)上游的排气导管(16)供应低沸点烃。 NOx还原反应需要低沸点烃。 HC生产装置通过裂化,分馏或裂化和分馏两者从柴油产生低沸点烃。 裂化和/或蒸馏的燃料包括大量低沸点碳氢化合物,并且当低沸点烃通过HC供应引入排气管道(3)时,可提高贫NOx催化剂(3)的NOx净化率 手段。

    Exhaust gas purification system for an internal combustion engine
    3.
    发明公开
    Exhaust gas purification system for an internal combustion engine 失效
    内燃机废气净化系统

    公开(公告)号:EP0433772A2

    公开(公告)日:1991-06-26

    申请号:EP90123338.7

    申请日:1990-12-05

    IPC分类号: F01N3/20

    摘要: An exhaust gas purification system for an internal combustion engine includes a catalyst (4, 21A, 2B, 2C, 2D, 2E, 2F) installed in an exhaust conduit of an engine (2, 1A, 1B, 1D, 1E, 1F) and constructed of zeolite carrying at least one kind of metal selected from transition metals and noble metals to reduce nitrogen oxides included in the exhaust gas from the engine under an oxidizing gas condition and in the presence of hydrocarbons. The system further includes means for repeating a cycle of cooling the catalyst (4, 21A, 2B, 2C, 2D, 2E, 2F) and then stopping the cooling to allow the catalyst to rise in temperature so that the temperature rising courses of the catalyst are positively and repeatedly produced. Since the catalyst can show a higher nitrogen oxides reducing ability in the temperature rising course than in the temperature lowering course, the NOx purification rate is greatly improved due to the positive production of the temperature rising courses.

    摘要翻译: 一种用于内燃机的排气净化系统包括安装在发动机(2,1A,1B,1D,1E,1F)的排气管道中的催化剂(4,21A,2B,2C,2D,2E,2F)和 由携带选自过渡金属和贵金属中的至少一种金属的沸石构成,以在氧化气体条件下和在烃存在下还原发动机排气中包含的氮氧化物。 该系统还包括用于重复冷却催化剂(4,21A,2B,2C,2D,2E,2F)并然后停止冷却以使催化剂升温的循环的装置,使得催化剂的升温过程 积极和反复产生。 由于催化剂在升温过程中的氮氧化物还原能力高于降温过程中的氮氧化物还原能力,所以由于升温过程的积极产生,NOx净化率大大提高。