发明申请
- 专利标题: Exhaust aftertreatment system using urea water
- 专利标题(中): 排尿后处理系统采用尿素水
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申请号: US11493568申请日: 2006-07-27
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公开(公告)号: US20070036694A1公开(公告)日: 2007-02-15
- 发明人: Akira Nishioka , Kiyoshi Amou , Yoshihiro Sukegawa , Takehiko Kowatari , Yasunaga Hamada , Ikuhisa Hamada , Toshifumi Mukai , Yoshinori Taguchi , Hiroshi Yokota
- 申请人: Akira Nishioka , Kiyoshi Amou , Yoshihiro Sukegawa , Takehiko Kowatari , Yasunaga Hamada , Ikuhisa Hamada , Toshifumi Mukai , Yoshinori Taguchi , Hiroshi Yokota
- 申请人地址: JP Chiyoda-ku JP Chiyoda-ku JP Minato-ku
- 专利权人: Hitachi, Ltd.,Babcock-Hitachi K.K.,Hitachi High-Technologies Corporation
- 当前专利权人: Hitachi, Ltd.,Babcock-Hitachi K.K.,Hitachi High-Technologies Corporation
- 当前专利权人地址: JP Chiyoda-ku JP Chiyoda-ku JP Minato-ku
- 优先权: JP2005-219090 20050728
- 主分类号: B01D53/34
- IPC分类号: B01D53/34 ; B01D50/00
摘要:
An exhaust aftertreatment system comprises an injector for injecting urea water into an exhaust duct, and a denitration catalyst disposed downstream of the injector with respect to a flow of exhaust gas. The exhaust aftertreatment system reduces nitrogen oxides in the exhaust gas by the denitration catalyst while using ammonia produced from the urea water injected from the injector. The urea water is injected along a direction of the flow of the exhaust gas within the exhaust duct, and a porous plate is disposed in multiple stages in a space of the exhaust duct such that droplets of the injected urea water impinge against the porous plate before reaching a wall surface of the exhaust duct. A surface of the porous plate subjected to the impingement of the droplets is arranged to face downstream with respect to the flow of the exhaust gas. Deposition of the urea water is prevented by causing film boiling when the droplets impinge against the porous plate, and the urea water reflected by the porous plate is uniformly dispersed into the exhaust gas. Thus, the urea water is uniformly dispersed into the exhaust gas without increasing a pressure loss of the exhaust gas. The urea water is prevented from depositing on the wall surface and producing a precipitate in the form of a solid.