JP5349575B2 - 還元剤水溶液ミキシング装置及び排気ガス後処理装置 - Google Patents
還元剤水溶液ミキシング装置及び排気ガス後処理装置 Download PDFInfo
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- F01N13/08—Other arrangements or adaptations of exhaust conduits
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
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Description
図1は本発明の一実施形態による排気ガス後処理装置1の構成図である。この排気ガス後処理装置1は、排気上流側(以下、単に「上流側」と記す)から順に、ディーゼル・パーティキュレート・フィルタ(Diesel particulate filter:以下、「DPF」と記す)1Aと、尿素水溶液ミキシング装置1Bと、窒素酸化物還元触媒(以下、「SCR」と記す)1Cと、を備えている。これらの各装置は、図示しないディーゼルエンジンから排気マニホールドを介して排出される排気ガスが流通する排気管の途中に設けられている。
図2に本発明の一実施形態による尿素水溶液ミキシング装置1Bの構成を示している。尿素水溶液ミキシング装置1Bは、前述のように、DPF1AとSCR1Cとの間に配置されている。なお、図1では、尿素水溶液ミキシング装置1Bの下流側に接続された接続管2も含めて示している。
排気管4Bは、排気上流側(以下、単に「上流側」と記す)に配置されたエルボ部10と、エルボ部10の下流側に配置された直線部11と、を有している。エルボ部10及び直線部11はともに円筒状に形成されている。
インジェクタ5は、エルボ部10の湾曲部10aの外側部分において、ミキシングパイプ6とともに取付部10bに装着されている。この取付構造の詳細は後述する。インジェクタ5は、先端の噴出口から尿素水溶液のみをエアと混合することなく直線部11に向かってミキシングパイプ6の内部に噴射する。この実施形態に用いられるインジェクタ5は、噴射角度が25°であり、このインジェクタ5の噴出口の中心は、排気管4Bの直線部11の中心軸CLの延長線上に位置している。
ミキシングパイプ6は、このミキシングパイプ6をエルボ部10に固定するための部材等とサブユニット化されている。このサブユニットを図4及び図5に示す。なお、図5は図4の右側面図である。
内管7は、図2及び図3に示すように、円筒状に形成され、外周面はフランジ12の支持突起12cの先端によって支持されており、これらは溶接されて固定されている。これにより、内管7は、ミキシングパイプ6の下流側において、直線部11の内壁との間に間隔をあけて配置されている。すなわち、内管7と直線部11によって二重管が形成されている。また、内管7の内径はミキシングパイプ6の外径よりも大きく、内管7はミキシングパイプ6の出口部から所定の距離離れて配置されている。
図6を用いて、インジェクタ5(尿素水溶液の噴射角度)と、ミキシングパイプ6と、内管7と、エルボ部10及び直線部11を含む排気管4Bとの位置関係を詳細に説明する。ここで、前述のように、ミキシングパイプ6と内管7とは同軸上に配置されており、インジェクタ5の噴出口は、これらの中心軸CLの延長線上に位置しており、内管7の入口部開口と対向している。
エンジンの稼働時には、排気ガスが排気マニホールドを介して排気管に排出される。この排気ガスは、エルボ部10に流れてくる。エルボ部10に流入してきた排気ガスは、図7の矢印G1で示すように、ミキシングパイプ6の外周面の開口6aを通過してミキシングパイプ6の内部に流入する。また、排気ガスは、図7の矢印G2で示すように、ミキシングパイプ6の外周面とエルボ部10の内壁との間に形成された流通部20を通過して内管7に導かれる。
(1)尿素水溶液はミキシングパイプ6の内部に噴射され、排気ガスはミキシングパイプ6の開口6aを通過してミキシングパイプ6の内部に流入する。したがって、尿素水溶液がエルボ部10の内壁に付着するのが抑えられる。
本発明は以上のような実施形態に限定されるものではなく、本発明の範囲を逸脱することなく種々の変形又は修正が可能である。
1A DPF
1B 尿素水溶液ミキシング装置
1C SCR
4,24 排気管
5 インジェクタ
6,6’ ミキシングパイプ
6a 開口
7,30 内管
30a 内管の開口
10,25 エルボ部
10a 湾曲部
11,26 直線部
12 フランジ(支持部材)
12c 支持突起
20 流通部
26b 支持用凹部
B,D 開口6aが形成された領域
Claims (3)
- 排気ガス中の粒子状物質を捕集するフィルタと排気ガス中の窒素酸化物を還元浄化する還元触媒との間に配置され、排気ガス中に還元剤水溶液を添加するための還元剤水溶液ミキシング装置であって、
湾曲部を有するエルボ部と、前記エルボ部の排気下流側に設けられた直線部と、を有する排気管と、
前記エルボ部の湾曲部外側に設けられ、前記直線部に向かって前記エルボ部内部に還元剤水溶液を噴射するインジェクタと、
前記エルボ部内部において前記インジェクタから噴射される還元剤水溶液の周囲を覆うように配置され、外周面に複数の開口を有するミキシングパイプと、
前記ミキシングパイプの排気下流側に、前記ミキシングパイプの排気下流側の出口部と排気流に沿った方向に間隔をあけて、かつ前記直線部の内壁との間に間隔をあけて配置され、内部及び外周部を排気ガスが流通可能な内管と、
を備えた還元剤水溶液ミキシング装置。 - 前記内管の排気上流側の入口部の内径は前記ミキシングパイプの出口部の内径より大きい、請求項1に記載の還元剤水溶液ミキシング装置。
- 前記ミキシングパイプ及び前記内管は、前記ミキシングパイプの出口部開口と前記内管の入口部開口が前記インジェクタの噴射角度範囲を内包するように配置されている、請求項2に記載の還元剤水溶液ミキシング装置。
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US13/696,293 US8916101B2 (en) | 2011-12-27 | 2012-04-18 | Reducing agent aqueous solution mixing device and exhaust gas post-treatment device |
DE112012000021.8T DE112012000021B4 (de) | 2011-12-27 | 2012-04-18 | Vorrichtung zum mischen einer wässrigen reduktionsmittellösung und abgasnachbehandlungsvorrichtung |
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