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    • 52. 发明公开
    • Exhaust gas purifying system
    • 废气净化系统
    • EP1094206A2
    • 2001-04-25
    • EP00123007.7
    • 2000-10-23
    • Nissan Motor Co., Ltd.
    • Yamamoto, ShinjiKanesaka, HiroyukiOnodera, HitoshiHanaki, YasunariSuga, KatsuoMorita, HiroshiHiramoto, YoshiakiKaneko, Hiroaki
    • F01N3/20B01D53/94F02D41/02
    • B01J35/0006B01D53/8631B01D53/8696B01D53/9431B01D53/9495B01J23/58B01J23/60B01J23/63B01J37/0244B01J37/0248F01N3/0814F01N3/0842F01N3/206F01N13/009F01N2240/30F01N2330/06F01N2610/04F01N2610/08F02D41/0275
    • An exhaust gas purifying system for an automotive internal combustion engine comprises a NOx treating catalyst for reducing NOx disposed in an exhaust gas passageway of a combustion device, to reduce NOx in presence of reducing components in exhaust gas. Additionally, a hydrogen enriching device is disposed upstream of the NOx treating catalyst with respect to flow of exhaust gas from the combustion device and arranged to increase a ratio of hydrogen to total reducing components in at least one of combustion gas and exhaust gas so as to meet relations represented by following formulae (1) and (2), when reduction of NOx is carried out by the NOx treating catalyst:

              [H2 / TR]d > [H2 / TR]u     (1)



              [H2 / TR]d ≥ 0.3     (2)

      where [H2 / TR]u is a ratio between a concentration [H2]u of hydrogen and a concentration [TR]u of total reducing components in at least one of exhaust gas in the exhaust gas passageway upstream of the hydrogen enriching device and combustion gas in a state before undergoing the hydrogen ratio increasing by the hydrogen enriching means; and [H2 / TR]d is a ratio between a concentration [H2]d of hydrogen and a concentration [TR]d of total reducing components in exhaust gas in the exhaust gas passageway upstream of the NOx treating catalyst and downstream of the hydrogen enriching device.
    • 用于汽车内燃机的排气净化系统包括用于还原布置在燃烧装置的排气通道中的NOx的NOx处理催化剂,以在排气中的还原成分存在的情况下还原NOx。 另外,关于来自燃烧装置的排气的流动,在NO x处理催化剂的上游设置富氢装置,并且设置成增加燃烧气体和排气中的至少一个中的氢与全部还原成分的比率,以便 (1)和(2)表示的关系,当由NO x处理催化剂进行NO x还原时:[H 2 / TR] d(1)[H 2 / TR] 0.3 ...(2)其中[H2 / TR] u是氢气浓度[H2] u与氢气上游排气通道中至少一个排气中总还原组分的浓度[TR] u之间的比率 使富氢装置和燃烧气体处于氢比率增加之前的状态; [H 2 / TR] d是氢处理浓度[H 2] d与NOx处理催化剂上游废气通道中排气中总还原成分浓度[TR] d之间的比率, 设备。