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    • 7. 发明授权
    • Exhaust gas purification device for an engine
    • 发动机废气净化装置
    • US5746052A
    • 1998-05-05
    • US525892
    • 1995-09-08
    • Yukio KinugasaKouhei IgarashiTakaaki ItouTakehisa YaegashiToshifumi Takaoka
    • Yukio KinugasaKouhei IgarashiTakaaki ItouTakehisa YaegashiToshifumi Takaoka
    • B01D53/94F01N3/20F01N3/22F01N3/24F01N13/02F01N13/04F02D41/04
    • B01D53/9454B01D53/9431B01D53/9477B01D53/9495F01N13/009F01N13/011F01N3/20F01N3/206F01N2240/25F01N2570/14F01N2610/02Y02T10/22
    • In the present invention, the exhaust gas from the engine is divided into a first and a second branch exhaust passages after it passes through a three-way reducing and oxidizing catalyst, and the two branch exhaust passages merge into an exhaust gas outlet passage. In the first branch exhaust passage, an oxidizing catalyst is disposed, and in the exhaust gas outlet passage, a denitrating and oxidizing catalyst is disposed. NO.sub.x in the exhaust gas from the engine is all converted to N.sub.2 and NH.sub.3 by the three-way reducing and oxidizing catalyst and a part of the NH.sub.3 generated by the three-way catalyst flows into the first branch exhaust passage and is converted to NO.sub.x again by the oxidizing catalyst. The amount of NO.sub.x produced by the oxidizing catalyst and the amount of NO.sub.x flowing through the second branch exhaust passage is determined by the flow distribution ratio of the first and the second branch exhaust passages. In this invention, the flow ratio is determined in such a manner that the amount of the NO.sub.x produced by the oxidizing catalyst and the amount of the NH.sub.3 passing through the second branch exhaust passage are stoichiometric to produce N.sub.2 and H.sub.2 O. Therefore, when these exhaust gases flow into the denitrating and oxidizing catalyst after they mix with each other in the exhaust gas outlet passage, all the NO.sub.x and the NH.sub.3 are converted to N.sub.2 and H.sub.2 O by the denitrating and oxidizing catalyst without producing any surplus NO.sub.x or NH.sub.3.
    • 在本发明中,来自发动机的废气在通过三通还原氧化催化剂后被分成第一和第二分支排气通道,两个分支排气通道合流到废气出口通道中。 在第一分支排气通道中设置氧化催化剂,并且在排气出口通道中设置脱硝和氧化催化剂。 来自发动机的废气中的NOx通过三元还原氧化催化剂全部转化为N 2和NH 3,并且由三元催化剂产生的一部分NH 3流入第一分支排气通道并再次转化为NOx 通过氧化催化剂。 由氧化催化剂产生的NOx的量和流过第二分支排气通道的NOx的量由第一和第二分支排气通道的流量分配比确定。 在本发明中,流量比以如下方式确定:氧化催化剂产生的NOx的量和通过第二分支排气通道的NH 3的量是化学计量的,以产生N 2和H 2 O. 因此,当这些废气在废气出口通道中彼此混合后流入脱硝和氧化催化剂时,所有的NOx和NH 3都被脱硝和氧化催化剂转化为N 2和H 2 O,而不产生任何剩余的NOx或 NH3。