JP2004353491A - Exhaust emission control device - Google Patents

Exhaust emission control device Download PDF

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JP2004353491A
JP2004353491A JP2003149672A JP2003149672A JP2004353491A JP 2004353491 A JP2004353491 A JP 2004353491A JP 2003149672 A JP2003149672 A JP 2003149672A JP 2003149672 A JP2003149672 A JP 2003149672A JP 2004353491 A JP2004353491 A JP 2004353491A
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exhaust gas
honeycomb structure
electrode
purifying apparatus
processing units
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JP4292868B2 (en
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Hideo Yahagi
秀夫 矢作
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Toyota Motor Corp
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Toyota Motor Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/06—Plant or installations having external electricity supply dry type characterised by presence of stationary tube electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/49—Collecting-electrodes tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/08—Ionising electrode being a rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/10—Ionising electrode has multiple serrated ends or parts

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of efficiently collecting/processing particulate substances. <P>SOLUTION: This exhaust emission control device 1 controlling exhaust gas by using plasma comprises a purification container 2 incorporated between exhaust pipes L1 and L2 and into which exhaust gas is led, a honeycomb structure 4, a bar-like electrode 5 disposed at the center of the honeycomb structure 4 and extending in the flow direction of the exhaust gas, and a plurality of processing units 7 having outer peripheral electrodes 6 disposed on the outer periphery of the honeycomb structure 4. The processing units 7 are installed in the purification container 2 parallel with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、プラズマを用いて排気ガスを浄化する排ガス浄化装置に関する。
【０００２】
【従来の技術】
従来から、車両用内燃機関の排気系統に組み込まれて当該内燃機関の排気ガスを浄化する装置として、相対する電極に高電圧を印加して発生させたプラズマを用いて排気ガスを浄化する排ガス浄化装置（プラズマリアクタ）が知られている（例えば、特許文献１参照。）。この排ガス浄化装置は、いわゆるウォールフロー型の浄化装置として構成されており、排気系統に組み込まれるケーシング（浄化容器）と、排気ガス中のパティキュレート物質（以下、「ＰＭ物質」という）を捕集するセラミック製フィルタとを有している。フィルタは、ケーシングの内部に配置され、その外周部に上流側排気ガス通路を画成すると共に、その中心部に下流側排気ガス通路を画成する。
【０００３】
この排ガス浄化装置のケーシング内に導入された排気ガスは、ケーシングの内周面付近の上流側排ガス通路に流れ込み、セラミック製フィルタの襞状に折り曲げられた部分を流通した後、下流側排気ガス通路を介してケーシングから流出する。そして、排気ガスがセラミック製フィルタを流通する間に、排気ガス中のＰＭ物質がフィルタにより捕集される。更に、フィルタによって捕集されたＰＭ物質は、プラズマによって反応消滅または焼却される。
【０００４】
【特許文献１】
特開２００１−２９５６２９号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、上述のように構成される従来の排ガス浄化装置では、基本的に、排気ガス中のＰＭ物質を帯電させる領域（電界が形成される領域）と、ＰＭ物質を捕集するための領域とが、セラミック製フィルタの襞状に折り曲げられた部分に限られる。このため、上述の従来の排ガス浄化装置では、ＰＭ物質の捕集効率や処理効率を更に向上させることは困難であり、より効率よくＰＭ物質を捕集・処理可能な排ガス浄化装置の出現が求められている。
【０００６】
そこで、本発明は、効率よくパティキュレート物質を捕集・処理可能な排ガス浄化装置の提供を目的とする。
【０００７】
【課題を解決するための手段】
本発明による排ガス浄化装置は、プラズマを用いて排気ガスを浄化する排ガス浄化装置において、排気ガスが導入される浄化容器と、ハニカム構造体、当該ハニカム構造体の中心に配置されて排気ガスの流れ方向に延びる棒状電極、および、ハニカム構造体の外周に配置された外周電極をそれぞれ含む複数の処理ユニットとを備え、処理ユニットが浄化容器内に並設されていることを特徴とする。
【０００８】
この排ガス浄化装置では、それぞれハニカム構造体、棒状電極および外周電極を含む処理ユニットが複数用いられている。従って、この排ガス浄化装置では、１体の処理ユニットを用いる場合と比較して、各処理ユニットにおける棒状電極と外周電極との間の距離を短くすることができるので、電源の容量を必要以上に増加させることなく、棒状電極と外周電極との間に形成される電界を強めると共に、当該電界を応答性よく良好に制御することが可能となる。この結果、この排ガス浄化装置によれば、各処理ユニットごとに、排気ガス中のＰＭ物質を効率よく帯電させてハニカム構造体に捕集すると共に、各処理ユニットごとに捕集されたＰＭ物質を効率よく処理することが可能となる。
【０００９】
この場合、複数の処理ユニットの何れか１体は、浄化容器の中心に位置する中心電極を含み、この中心電極は、浄化容器の排気ガス入口に向けてハニカム構造体から突出しており、その先端に複数の放電突起を有していると好ましい。
【００１０】
【発明の実施の形態】
以下、図面と共に本発明による排ガス浄化装置の好適な実施形態について詳細に説明する。
【００１１】
図１は、本発明による排ガス浄化装置の一実施形態を示す断面図であり、図２は、図１におけるＩＩ−ＩＩ線についての断面図である。これらの図面に示される排ガス浄化装置１は、車両に適用されると好適なものであり、図示されない内燃機関の燃焼室から排出される排気ガスを浄化するために、当該内燃機関の排気系統を構成する排気管Ｌ１と排気管Ｌ２との間に組み込まれる。図１および図２に示されるように、排ガス浄化装置１は、浄化容器２を有し、この浄化容器２の内部には、排気管Ｌ１を介して内燃機関の燃焼室から排出される排気ガスが導入される。そして、浄化容器２の内部で浄化された排気ガスは、排気管Ｌ２を介して外部に排出される。
【００１２】
浄化容器２は、金属等により概ね円筒状に形成されており、排気管Ｌ１またはＬ２に接続される入口端部２１および出口端部２２と、排気管Ｌ１，Ｌ２よりも大きな内径を有する拡径部２３と、入口端部２１と拡径部２３との間および出口端部２２と拡径部２３との間に形成されたコーン部２４とを含む。また、浄化容器２の拡径部２３の内周面には、円筒状に形成された絶縁部材３が固定されている。
【００１３】
このような浄化容器２の内部には、図１および図２に示されるように、ハニカム構造体４、棒状電極５および外周電極６をそれぞれ含む処理ユニット７が複数（本実施形態では、７体）並設されている。本実施形態では、浄化容器２内の絶縁部材３の内周面上に、６体の処理ユニット７が等間隔に配置されると共に、これら６体の処理ユニット７の中心、すなわち、浄化容器２の中心に位置するように１体の処理ユニット７が配置されている。上記６体の処理ユニット７の外周電極６のうち、互いに隣り合う外周電極６同士は、図２に示されるように互いに接し合っている。また、上記１体の処理ユニット７の外周電極６は、上記６体の処理ユニット７の外周電極６と接している。
【００１４】
各処理ユニット７のハニカム構造体４は、浄化容器２の内部に流れ込んだ排気ガス中のＰＭ物質を捕集するために用いられるものである。各ハニカム構造体４は、セラミック（例えば、コージェライトやアルミナ）等により形成されており、排気ガスの流通方向（浄化容器２の延在方向）に延びる多数のセルを有している。また、ハニカム構造体４には、例えば、Ｐｔ／ＣｅＯ２，Ｍｎ／ＣｅＯ２，Ｆｅ／ＣｅＯ２，Ｎｉ／ＣｅＯ２，Ｃｕ／ＣｅＯ２等の酸化触媒が担持されている。本実施形態では、各処理ユニット７のハニカム構造体４は、同一の素材により同一の寸法に形成されている。
【００１５】
各処理ユニット７の棒状電極５は、ハニカム構造体４の中心に配置されて排気ガスの流れ方向（ハニカム構造体４のセルの延在方向）に延びる。本実施形態において、各棒状電極５は、何れも排気ガスの出口（排気管Ｌ２）に向けてハニカム構造体４から突出している。そして、各棒状電極５は、各ハニカム構造体４の下流側（排気管Ｌ２側）において合流し、給電端子８等を介して高圧電源１０に接続されている。これにより、各棒状電極５に対する給電部によってＰＭ物質の捕集が妨げられてしまうことを防止することができる。なお、高圧電源１０としては、直流高圧電源、交流高圧電源および直流パルス電源の何れかを用いることができる。
【００１６】
また、ハニカム構造体４を介して内側の棒状電極５と対をなす外周電極６は、金属メッシュあるいは金属ペースト等により円筒状に形成され、各ハニカム構造体４の外周面に積層されている。各処理ユニット７の外周電極６は、上述のように互いに接し合っており、端子９を介して接地されている。本実施形態では、高圧電源１０により、各棒状電極５を負極として、各棒状電極５と各外周電極６との間に高電圧が印加される。
【００１７】
また、浄化容器２の中心に位置する処理ユニット７の棒状電極５ｃは、排ガス浄化装置１の中心電極として機能し、浄化容器２の排気ガス入口（排気管Ｌ１）に向けてハニカム構造体４から突出している。そして、中心電極としての棒状電極５ｃの先端には、複数の放電突起５ｄが設けられている。各放電突起５ｄは、棘状に形成されており、棒状電極５ｃの先端から放射状に延出されている。このような構成を採用することにより、浄化容器２の内部に良好に電界を形成して効率よくプラズマを発生させることができる。
【００１８】
更に、図２からわかるように、浄化容器２の内部には、各処理ユニット７同士の隙間や、各処理ユニット７と絶縁部材３との隙間を埋めるように充填材１５が配置されており、これにより、各処理ユニット７が互いに一体化されている。本実施形態では、充填材１５として、セラミック等の多孔質体が用いられている。これにより、排気ガスが何ら処理されることなく浄化容器２を通過してしまうことが防止され、かつ、浄化容器２の内部における誘電率を高めることが可能となる。
【００１９】
さて、上述のように構成される排ガス浄化装置１では、内燃機関の始動と共に、排気管Ｌ１を介して内燃機関の燃焼室からの排気ガスが浄化容器２の内部に導入される。また、内燃機関の始動に合わせて、各処理ユニット７（各ハニカム構造体４）にてプラズマを発生させるべく、棒状電極５と外周電極６との間に高圧電源１０によって高電圧が印加される。
【００２０】
ここで、排ガス浄化装置１には、上述のように、それぞれハニカム構造体４、棒状電極５および外周電極６を含む処理ユニット７が複数備えられている。従って、排ガス浄化装置１では、１体の処理ユニットを用いる場合と比較して、各処理ユニット７における棒状電極５と外周電極６との間の距離を短くすることができる。これにより、高圧電源１０の容量を必要以上に増加させることなく、棒状電極５と外周電極６との間に形成される電界を強めると共に、各処理ユニット７における電界を応答性よく良好に制御することが可能となる。
【００２１】
この結果、排ガス浄化装置１によれば、各処理ユニット７ごとに、排気ガス中のＰＭ物質を効率よく帯電させてハニカム構造体４に捕集することが可能となる。また、排ガス浄化装置１では、各処理ユニット７における棒状電極５と外周電極６との間の距離が同一とされているので、各処理ユニット７におけるＰＭ物質の吸着性（捕集率）を均等にすることができる。
【００２２】
そして、排ガス浄化装置１では、排気ガスが各処理ユニット７（ハニカム構造体４）を流通する間に、各処理ユニット７において発生させられたプラズマにより、排気ガス中の酸素や一酸化窒素等が活性化（ラジカル化）され、高い酸化活性をもったオゾン（Ｏ３）、活性化酸素（Ｏ２ −）、二酸化窒素（ＮＯ２）等が生成される。そして、各処理ユニット７のハニカム構造体４のセル内に捕集されたＰＭ物質は、これらの高酸化活性成分と反応して燃焼、焼却される。更に、排ガス浄化装置１では、各処理ユニット７のハニカム構造体４に担持されている酸化触媒の作用により、ＰＭ物質の燃焼が促進される。これにより、排ガス浄化装置１によれば、各処理ユニット７のハニカム構造体４ごとにＰＭ物質を効率よく処理することが可能となる。そして、浄化容器２の内部で良好に浄化された排気ガスは、排気管Ｌ２を介して外部に排出されることになる。
【００２３】
図３は、本発明による排ガス浄化装置の他の実施形態を示す断面図である。なお、上述の実施形態に関連して説明されたものと同一の要素には同一の参照符号が付され、重複する説明は省略される。
【００２４】
図３に示される排ガス浄化装置１Ａでは、浄化容器２の内部に配置された絶縁部材３の内周面に、金属メッシュあるいは金属ペースト等により円筒状に形成された外側電極１１が積層されている。また、外側電極１１の内側には、金属メッシュあるいは金属ペースト等により円筒状に形成された内側電極１２が同心に配置されている。更に、外側電極１１と内側電極１２との間の領域には、複数（本実施形態では６枚）の仕切電極１４が等間隔かつ放射状に配置されている。各仕切電極１４も金属メッシュあるいは金属ペースト等により形成される。
【００２５】
そして、外側電極１１、内側電極１２および互いに隣り合うの仕切電極１４とにより囲まれる領域には、概ね扇形の断面形状を有するハニカム構造体４ａが配置され、内側電極１２の内部には、概ね円筒状に形成されたハニカム構造体４ｃが配置される。各ハニカム構造体４ａ，４ｃも、セラミック（例えば、コージェライトやアルミナ）等により形成されており、排気ガスの流通方向（浄化容器２の延在方向）に延びる多数のセルを有している。また、各ハニカム構造体４ａ，４ｃにも、例えば、Ｐｔ／ＣｅＯ２，Ｍｎ／ＣｅＯ２，Ｆｅ／ＣｅＯ２，Ｎｉ／ＣｅＯ２，Ｃｕ／ＣｅＯ２等の酸化触媒が担持されている。なお、本実施形態では、ハニカム構造体４ａおよび４ｃは、概ね同一の断面積を有するように形成されている。
【００２６】
更に、各ハニカム構造体４ａのほぼ中心部には、棒状電極５が配置され、ハニカム構造体４ｃの中心には、棒状電極（中心電極）５ｃが配置されている。各棒状電極５，５ｃは、排気ガスの流れ方向（ハニカム構造体４のセルの延在方向）に延びる。そして、各棒状電極５，５ｃは、各ハニカム構造体４ａ，４ｃの下流側において合流し、給電端子等を介して図示されない高圧電源に接続されている。一方、外側電極１１と内側電極１２とは、複数の仕切電極１４を介して電気的に接続され、これらの電極１１，１２および１４は、端子を介して接地される。
【００２７】
このように構成された構成された排ガス浄化装置１Ａでは、外側電極１１、内側電極１２、互いに隣り合う仕切電極１４、ハニカム構造体４ａおよび棒状電極５により複数（６体）処理ユニット７Ａが構成される。この場合、処理ユニット７Ａにおいて、外側電極１１、内側電極１２および互いに隣り合う仕切電極１４は、棒状電極５と対をなす外周電極として機能する。また、これらの処理ユニット７Ａの内側には、外周電極としての機能する内側電極１２、ハニカム構造体４ｃおよび棒状電極５ｃにより処理ユニット７Ｃが構成される。かかる排ガス浄化装置１Ａによれば、ＰＭ物質を吸着させる面積を増加させることが可能となり、各処理ユニット７Ａ，７Ｃごとに、排気ガス中のＰＭ物質を効率よく帯電させてハニカム構造体４ａ，４ｃに捕集すると共に、各処理ユニット７Ａ，７Ｃごとに捕集されたＰＭ物質を効率よく処理することが可能となる。
【００２８】
なお、上述の排ガス浄化装置１および１Ａにおいて、各処理ユニット７ごとに電極対に印加する電圧を変化させてもよい。また、上述の排ガス浄化装置１および１Ａでは、複数の処理ユニットが浄化容器の内部に２重に配置されていたが、これに限られるものではなく、各処理ユニットを小型化して浄化容器の内部に多重（３重以上）に配置してもよい。
【００２９】
【発明の効果】
以上説明されたように、本発明によれば、効率よくパティキュレート物質を捕集・処理可能な排ガス浄化装置の実現が可能となる。
【図面の簡単な説明】
【図１】本発明による排ガス浄化装置の一実施形態を示す概略構成図である。
【図２】図１におけるＩＩ−ＩＩ線についての断面図である。
【図３】本発明による排ガス浄化装置の他の実施形態を示す概略構成図である。
【符号の説明】
１，１Ａ 排ガス浄化装置
２ 浄化容器
３ 絶縁部材
４，４ａ，４ｃ ハニカム構造体
５，５ｃ 棒状電極
５ｄ 放電突起
６ 外周電極
７，７Ａ，７Ｃ 処理ユニット
８ 給電端子
９ 端子
１０ 高圧電源
１１ 外側電極
１２ 内側電極
１４ 仕切電極
１５ 充填材
２１ 入口端部
２２ 出口端部
２３ 拡径部
２４ コーン部
Ｌ１，Ｌ２ 排気管[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an exhaust gas purifying apparatus that purifies exhaust gas using plasma.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a device that is incorporated in an exhaust system of a vehicular internal combustion engine and purifies exhaust gas of the internal combustion engine, exhaust gas purification that purifies exhaust gas by using plasma generated by applying a high voltage to opposing electrodes is used. An apparatus (plasma reactor) is known (for example, refer to Patent Document 1). This exhaust gas purification device is configured as a so-called wall flow type purification device, and collects a casing (purification container) incorporated in an exhaust system and particulate matter (hereinafter, referred to as “PM substance”) in exhaust gas. And a ceramic filter. The filter is disposed inside the casing, defines an upstream exhaust gas passage at an outer peripheral portion thereof, and defines a downstream exhaust gas passage at a central portion thereof.
[0003]
The exhaust gas introduced into the casing of the exhaust gas purifying device flows into the upstream exhaust gas passage near the inner peripheral surface of the casing, and flows through the folded portion of the ceramic filter, and then the downstream exhaust gas passage. Through the casing. Then, while the exhaust gas flows through the ceramic filter, PM substances in the exhaust gas are collected by the filter. Further, the PM matter collected by the filter is quenched or incinerated by the plasma.
[0004]
[Patent Document 1]
JP 2001-295629 A
[Problems to be solved by the invention]
However, in the conventional exhaust gas purifying apparatus configured as described above, basically, an area for charging PM substances in the exhaust gas (an area where an electric field is formed) and an area for collecting PM substances. Are limited to the folds of the ceramic filter. For this reason, it is difficult for the above-mentioned conventional exhaust gas purifying apparatus to further improve the collection efficiency and the processing efficiency of the PM substance, and the emergence of an exhaust gas purifying apparatus capable of collecting and processing the PM substance more efficiently is required. Have been.
[0006]
Therefore, an object of the present invention is to provide an exhaust gas purifying apparatus capable of efficiently collecting and treating particulate matter.
[0007]
[Means for Solving the Problems]
An exhaust gas purifying apparatus according to the present invention is an exhaust gas purifying apparatus for purifying exhaust gas using plasma, comprising: a purifying container into which the exhaust gas is introduced; a honeycomb structure; and a flow of the exhaust gas disposed at a center of the honeycomb structure. A plurality of processing units each including a rod-shaped electrode extending in the direction and an outer peripheral electrode arranged on the outer periphery of the honeycomb structure are provided, and the processing units are juxtaposed in the purification vessel.
[0008]
In this exhaust gas purifying apparatus, a plurality of processing units each including a honeycomb structure, a rod-shaped electrode, and an outer peripheral electrode are used. Therefore, in this exhaust gas purifying apparatus, the distance between the rod-shaped electrode and the outer peripheral electrode in each processing unit can be shortened as compared with the case of using one processing unit, so that the capacity of the power supply is increased more than necessary. Without increasing the electric field, the electric field formed between the rod-shaped electrode and the outer peripheral electrode can be strengthened, and the electric field can be satisfactorily controlled with good responsiveness. As a result, according to this exhaust gas purifying apparatus, the PM substance in the exhaust gas is efficiently charged and collected in the honeycomb structure for each processing unit, and the PM substance collected for each processing unit is collected. Processing can be performed efficiently.
[0009]
In this case, any one of the plurality of processing units includes a central electrode located at the center of the purification container, and the central electrode projects from the honeycomb structure toward the exhaust gas inlet of the purification container, Preferably has a plurality of discharge projections.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of an exhaust gas purifying apparatus according to the present invention will be described in detail with reference to the drawings.
[0011]
FIG. 1 is a sectional view showing an embodiment of an exhaust gas purifying apparatus according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. The exhaust gas purifying apparatus 1 shown in these drawings is suitable for being applied to a vehicle. In order to purify exhaust gas discharged from a combustion chamber of an internal combustion engine (not shown), an exhaust system of the internal combustion engine is used. It is incorporated between the exhaust pipe L1 and the exhaust pipe L2 to be configured. As shown in FIGS. 1 and 2, the exhaust gas purifying apparatus 1 has a purifying vessel 2, and inside the purifying vessel 2, exhaust gas discharged from a combustion chamber of an internal combustion engine via an exhaust pipe L1. Is introduced. Then, the exhaust gas purified inside the purification container 2 is discharged to the outside via the exhaust pipe L2.
[0012]
The purification vessel 2 is formed in a substantially cylindrical shape by metal or the like, and has an inlet end 21 and an outlet end 22 connected to the exhaust pipe L1 or L2, and an enlarged diameter having an inner diameter larger than the exhaust pipes L1 and L2. And a cone portion 24 formed between the inlet end 21 and the enlarged diameter portion 23 and between the outlet end 22 and the enlarged diameter portion 23. A cylindrical insulating member 3 is fixed to the inner peripheral surface of the enlarged diameter portion 23 of the purification container 2.
[0013]
As shown in FIGS. 1 and 2, a plurality of processing units 7 each including the honeycomb structure 4, the rod-shaped electrode 5, and the outer peripheral electrode 6 are provided inside the purification container 2 (in this embodiment, seven processing units 7). ) It is juxtaposed. In the present embodiment, six processing units 7 are arranged at equal intervals on the inner peripheral surface of the insulating member 3 in the purification container 2, and the center of the six processing units 7, that is, the purification container 2 One processing unit 7 is arranged so as to be located at the center of the processing unit 7. Outer peripheral electrodes 6 adjacent to each other among the outer peripheral electrodes 6 of the six processing units 7 are in contact with each other as shown in FIG. Further, the outer peripheral electrode 6 of the one processing unit 7 is in contact with the outer peripheral electrode 6 of the six processing units 7.
[0014]
The honeycomb structure 4 of each processing unit 7 is used for collecting PM substances in the exhaust gas flowing into the inside of the purification container 2. Each honeycomb structure 4 is formed of ceramic (for example, cordierite or alumina) or the like, and has a large number of cells extending in a flow direction of the exhaust gas (a direction in which the purification vessel 2 extends). The honeycomb structure 4 supports an oxidation catalyst such as Pt / CeO 2 , Mn / CeO 2 , Fe / CeO 2 , Ni / CeO 2 , and Cu / CeO 2 . In the present embodiment, the honeycomb structures 4 of the respective processing units 7 are formed of the same material and in the same dimensions.
[0015]
The rod-shaped electrode 5 of each processing unit 7 is arranged at the center of the honeycomb structure 4 and extends in the flow direction of the exhaust gas (the extending direction of the cells of the honeycomb structure 4). In the present embodiment, each of the rod-shaped electrodes 5 protrudes from the honeycomb structure 4 toward an exhaust gas outlet (exhaust pipe L2). Each rod-shaped electrode 5 joins on the downstream side (the exhaust pipe L2 side) of each honeycomb structure 4 and is connected to the high-voltage power supply 10 via the power supply terminal 8 and the like. Thereby, it is possible to prevent the collection of the PM substance from being hindered by the power supply unit for each rod-shaped electrode 5. As the high-voltage power supply 10, any one of a DC high-voltage power supply, an AC high-voltage power supply, and a DC pulse power supply can be used.
[0016]
Further, an outer peripheral electrode 6 paired with the inner rod-shaped electrode 5 via the honeycomb structure 4 is formed in a cylindrical shape by a metal mesh or a metal paste or the like, and is laminated on the outer peripheral surface of each honeycomb structure 4. The outer peripheral electrodes 6 of each processing unit 7 are in contact with each other as described above, and are grounded via the terminal 9. In the present embodiment, a high voltage is applied between each rod-shaped electrode 5 and each peripheral electrode 6 by the high-voltage power supply 10 with each rod-shaped electrode 5 as a negative electrode.
[0017]
Further, the rod-shaped electrode 5c of the processing unit 7 located at the center of the purification container 2 functions as a center electrode of the exhaust gas purification device 1, and the honeycomb structure 4 extends from the honeycomb structure 4 toward the exhaust gas inlet (exhaust pipe L1) of the purification container 2. It is protruding. A plurality of discharge protrusions 5d are provided at the tip of the rod-shaped electrode 5c as the center electrode. Each of the discharge projections 5d is formed in a spike shape, and extends radially from the tip of the rod-shaped electrode 5c. By employing such a configuration, an electric field can be favorably formed inside the purification container 2 to efficiently generate plasma.
[0018]
Further, as can be seen from FIG. 2, a filler 15 is disposed inside the purification container 2 so as to fill gaps between the processing units 7 and gaps between the processing units 7 and the insulating member 3. Thus, the processing units 7 are integrated with each other. In the present embodiment, a porous body such as a ceramic is used as the filler 15. Thereby, it is possible to prevent the exhaust gas from passing through the purification vessel 2 without any processing, and to increase the dielectric constant inside the purification vessel 2.
[0019]
Now, in the exhaust gas purifying apparatus 1 configured as described above, the exhaust gas from the combustion chamber of the internal combustion engine is introduced into the purification vessel 2 via the exhaust pipe L1 when the internal combustion engine is started. In addition, a high voltage is applied between the rod-shaped electrode 5 and the outer peripheral electrode 6 by the high-voltage power supply 10 so as to generate plasma in each processing unit 7 (each honeycomb structure 4) at the start of the internal combustion engine. .
[0020]
Here, the exhaust gas purifying apparatus 1 is provided with a plurality of processing units 7 each including the honeycomb structure 4, the rod-shaped electrode 5, and the outer peripheral electrode 6, as described above. Therefore, in the exhaust gas purifying apparatus 1, the distance between the rod-shaped electrode 5 and the outer peripheral electrode 6 in each processing unit 7 can be reduced as compared with the case where one processing unit is used. Thereby, the electric field formed between the rod-shaped electrode 5 and the outer peripheral electrode 6 is strengthened without unnecessarily increasing the capacity of the high-voltage power supply 10, and the electric field in each processing unit 7 is controlled with good responsiveness. It becomes possible.
[0021]
As a result, according to the exhaust gas purifying apparatus 1, the PM substance in the exhaust gas can be efficiently charged and collected in the honeycomb structure 4 for each processing unit 7. Further, in the exhaust gas purifying apparatus 1, since the distance between the rod-shaped electrode 5 and the outer peripheral electrode 6 in each processing unit 7 is the same, the adsorbability (collection rate) of PM substances in each processing unit 7 is equalized. Can be
[0022]
In the exhaust gas purifying apparatus 1, while the exhaust gas flows through each processing unit 7 (honeycomb structure 4), the plasma generated in each processing unit 7 causes oxygen, nitrogen monoxide and the like in the exhaust gas to be reduced. Ozone (O 3 ), activated oxygen (O 2 − ), nitrogen dioxide (NO 2 ), and the like that are activated (radicalized) and have high oxidation activity are generated. Then, the PM substance collected in the cells of the honeycomb structure 4 of each processing unit 7 reacts with these highly oxidizing active components and is burned and incinerated. Further, in the exhaust gas purifying apparatus 1, the combustion of the PM substance is promoted by the action of the oxidation catalyst carried on the honeycomb structure 4 of each processing unit 7. Thus, according to the exhaust gas purifying apparatus 1, it is possible to efficiently process the PM substance for each of the honeycomb structures 4 of each processing unit 7. Then, the exhaust gas that has been well purified inside the purification container 2 is discharged to the outside via the exhaust pipe L2.
[0023]
FIG. 3 is a sectional view showing another embodiment of the exhaust gas purifying apparatus according to the present invention. The same elements as those described in relation to the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.
[0024]
In the exhaust gas purifying apparatus 1A shown in FIG. 3, an outer electrode 11 formed in a cylindrical shape with a metal mesh or a metal paste is laminated on an inner peripheral surface of an insulating member 3 arranged inside the purification vessel 2. . Inside the outer electrode 11, a cylindrical inner electrode 12 made of a metal mesh or a metal paste is concentrically arranged. Further, in a region between the outer electrode 11 and the inner electrode 12, a plurality of (six in the present embodiment) partition electrodes 14 are radially arranged at equal intervals. Each partition electrode 14 is also formed of a metal mesh or a metal paste.
[0025]
In a region surrounded by the outer electrode 11, the inner electrode 12, and the partition electrode 14 adjacent to each other, a honeycomb structure 4a having a substantially fan-shaped cross section is arranged. The honeycomb structure 4c formed in the shape is arranged. Each of the honeycomb structures 4a and 4c is also formed of ceramic (eg, cordierite or alumina) or the like, and has a large number of cells extending in the flow direction of the exhaust gas (the extending direction of the purification vessel 2). Further, each of the honeycomb structural body 4a, to 4c, for example, Pt / CeO 2, Mn / CeO 2, Fe / CeO 2, Ni / CeO 2, Cu / oxidation catalyst of CeO 2 or the like is carried. In the present embodiment, the honeycomb structures 4a and 4c are formed to have substantially the same cross-sectional area.
[0026]
Further, a rod-shaped electrode 5 is disposed substantially at the center of each honeycomb structure 4a, and a rod-shaped electrode (center electrode) 5c is disposed at the center of the honeycomb structure 4c. Each of the rod-shaped electrodes 5 and 5c extends in the flow direction of the exhaust gas (the extending direction of the cells of the honeycomb structure 4). The rod-shaped electrodes 5 and 5c join on the downstream side of the honeycomb structures 4a and 4c, and are connected to a high-voltage power supply (not shown) via a power supply terminal or the like. On the other hand, the outer electrode 11 and the inner electrode 12 are electrically connected via a plurality of partition electrodes 14, and these electrodes 11, 12 and 14 are grounded via terminals.
[0027]
In the exhaust gas purifying apparatus 1A thus configured, a plurality (six) processing units 7A are configured by the outer electrode 11, the inner electrode 12, the partition electrode 14 adjacent to each other, the honeycomb structure 4a, and the rod-shaped electrode 5. You. In this case, in the processing unit 7A, the outer electrode 11, the inner electrode 12, and the partition electrode 14 adjacent to each other function as an outer peripheral electrode paired with the rod-shaped electrode 5. Further, inside these processing units 7A, a processing unit 7C is configured by the inner electrode 12, which functions as an outer peripheral electrode, the honeycomb structure 4c, and the rod-shaped electrode 5c. According to the exhaust gas purifying apparatus 1A, it is possible to increase the area for adsorbing the PM substance, and to efficiently charge the PM substance in the exhaust gas for each of the processing units 7A, 7C to thereby form the honeycomb structures 4a, 4c. And the PM substances collected by each of the processing units 7A and 7C can be efficiently processed.
[0028]
In the exhaust gas purifying apparatuses 1 and 1A described above, the voltage applied to the electrode pair may be changed for each processing unit 7. Further, in the exhaust gas purifying apparatuses 1 and 1A described above, the plurality of processing units are doubly arranged inside the purification container. However, the present invention is not limited to this. May be arranged in multiple (three or more).
[0029]
【The invention's effect】
As described above, according to the present invention, it is possible to realize an exhaust gas purifying apparatus capable of efficiently collecting and treating particulate matter.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing one embodiment of an exhaust gas purifying apparatus according to the present invention.
FIG. 2 is a sectional view taken along line II-II in FIG.
FIG. 3 is a schematic configuration diagram showing another embodiment of the exhaust gas purifying apparatus according to the present invention.
[Explanation of symbols]
1, 1A Exhaust gas purification device 2 Purification container 3 Insulating members 4, 4a, 4c Honeycomb structure 5, 5c Rod electrode 5d Discharge projection 6 Outer electrode 7, 7A, 7C Processing unit 8 Power supply terminal 9 Terminal 10 High voltage power supply 11 Outer electrode 12 Inner electrode 14 Partition electrode 15 Filler 21 Inlet end 22 Outlet end 23 Large diameter portion 24 Cones L1, L2 Exhaust pipe

Claims (2)

プラズマを用いて排気ガスを浄化する排ガス浄化装置において、
排気ガスが導入される浄化容器と、
ハニカム構造体、当該ハニカム構造体の中心に配置されて排気ガスの流れ方向に延びる棒状電極、および、前記ハニカム構造体の外周に配置された外周電極をそれぞれ含む複数の処理ユニットとを備え、前記処理ユニットが前記浄化容器内に並設されていることを特徴とする排ガス浄化装置。In an exhaust gas purification device that purifies exhaust gas using plasma,
A purification vessel into which exhaust gas is introduced,
A honeycomb structure, a rod-shaped electrode arranged at the center of the honeycomb structure and extending in the flow direction of the exhaust gas, and a plurality of processing units each including an outer peripheral electrode arranged on the outer periphery of the honeycomb structure, An exhaust gas purifying apparatus, wherein a processing unit is arranged in the purifying container. 前記複数の処理ユニットの何れか１体は、前記浄化容器の中心に位置する中心電極を含み、この中心電極は、前記浄化容器の排気ガス入口に向けて前記ハニカム構造体から突出しており、その先端に複数の放電突起を有していることを特徴とする請求項１に記載の排ガス浄化装置。Any one of the plurality of processing units includes a central electrode located at the center of the purification container, and the central electrode projects from the honeycomb structure toward an exhaust gas inlet of the purification container. The exhaust gas purifying apparatus according to claim 1, comprising a plurality of discharge projections at a tip.
JP2003149672A 2003-05-27 2003-05-27 Exhaust gas purification device Expired - Fee Related JP4292868B2 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007258090A (en) * 2006-03-24 2007-10-04 Ngk Insulators Ltd Plasma generation electrode, plasma reactor, and exhaust gas clarification device
JP2011230115A (en) * 2010-04-09 2011-11-17 Ibiden Co Ltd Honeycomb structure
DE102010034250A1 (en) * 2010-08-13 2012-02-16 Emitec Gesellschaft Für Emissionstechnologie Mbh Holder for at least one electrode in an exhaust pipe
DE102010045506A1 (en) * 2010-09-15 2012-03-15 Emitec Gesellschaft Für Emissionstechnologie Mbh Device for generating an electric field in an exhaust system
EP2375018A3 (en) * 2010-04-09 2013-05-15 Ibiden Co., Ltd. Honeycomb structural body and exhaust gas conversion apparatus
JP2014238086A (en) * 2013-05-09 2014-12-18 臼井国際産業株式会社 Exhaust gas treatment device for marine diesel engine using heavy oil
CN110090546A (en) * 2019-05-30 2019-08-06 江苏新聚环保科技有限公司 Emission-control equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007258090A (en) * 2006-03-24 2007-10-04 Ngk Insulators Ltd Plasma generation electrode, plasma reactor, and exhaust gas clarification device
JP2011230115A (en) * 2010-04-09 2011-11-17 Ibiden Co Ltd Honeycomb structure
EP2375018A3 (en) * 2010-04-09 2013-05-15 Ibiden Co., Ltd. Honeycomb structural body and exhaust gas conversion apparatus
US8506894B2 (en) 2010-04-09 2013-08-13 Ibiden Co., Ltd. Honeycomb structural body and exhaust gas conversion apparatus
DE102010034250A1 (en) * 2010-08-13 2012-02-16 Emitec Gesellschaft Für Emissionstechnologie Mbh Holder for at least one electrode in an exhaust pipe
DE102010045506A1 (en) * 2010-09-15 2012-03-15 Emitec Gesellschaft Für Emissionstechnologie Mbh Device for generating an electric field in an exhaust system
US8790448B2 (en) 2010-09-15 2014-07-29 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Device for producing an electrical field in an exhaust gas system
JP2014238086A (en) * 2013-05-09 2014-12-18 臼井国際産業株式会社 Exhaust gas treatment device for marine diesel engine using heavy oil
CN110090546A (en) * 2019-05-30 2019-08-06 江苏新聚环保科技有限公司 Emission-control equipment

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