JP2009115064A - Exhaust emission control device - Google Patents

Exhaust emission control device Download PDF

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Publication number
JP2009115064A
JP2009115064A JP2007292343A JP2007292343A JP2009115064A JP 2009115064 A JP2009115064 A JP 2009115064A JP 2007292343 A JP2007292343 A JP 2007292343A JP 2007292343 A JP2007292343 A JP 2007292343A JP 2009115064 A JP2009115064 A JP 2009115064A
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Prior art keywords
filter
exhaust gas
reforming catalyst
reformer
partition wall
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JP2007292343A
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Japanese (ja)
Inventor
Yoshifumi Kato
祥文 加藤
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Toyota Industries Corp
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Toyota Industries Corp
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Priority to JP2007292343A priority Critical patent/JP2009115064A/en
Priority to EP08165383A priority patent/EP2058480A1/en
Priority to US12/259,533 priority patent/US20090120075A1/en
Publication of JP2009115064A publication Critical patent/JP2009115064A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F01N13/017—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F01N13/145—Double-walled exhaust pipes or housings with gas other than air filling the space between both walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0234—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 using means for regenerating the filters, e.g. by burning trapped particles using heat exchange means in the exhaust line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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]
    • F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/30—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel reformer

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of efficiently removing particulate matter collected by a filter. <P>SOLUTION: A reformer 7 is connected in the middle of an exhaust pipe 4, and a partition wall 7a having a hollow cylindrical shape is provided within the reformer 7. The filter 5 is provided within the partition wall 7a, and the outer peripheral face 5a of the filter 5 contacts the inner peripheral face 7b of the partition wall 7a. A reforming catalyst 6 is provided between the outer peripheral face 7c of the partition wall 7a and the inner peripheral face 7d of the reformer 7. The inner peripheral face 6a of the reforming catalyst 6 contacts the outer peripheral face 7c of the partition wall 7a and the outer peripheral face 6b of the reforming catalyst 6 contacts the inner peripheral face 7d of the reformer 7. When light oil is supplied to the reforming catalyst 6 by an injector 8 provided in the reformer 7, the reforming catalyst 6 reforms the light oil and generates heat of reaction. The reaction heat of the reforming catalyst 6 is directly transmitted to the filter 5 through the partition wall 7a and heats the filter 5. Since the filter 5 is heated, the particulate matter in exhaust gas collected by the filter 5 are burned and removed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、排ガス浄化装置に係り、特に、ディーゼルエンジンの排ガス中に含まれる粒子状物質を浄化する構造に関する。   The present invention relates to an exhaust gas purification apparatus, and more particularly to a structure for purifying particulate matter contained in exhaust gas of a diesel engine.

排ガス中に含まれる粒子状物質を、排気管の途中に設けたフィルタによって捕獲する排ガス浄化装置において、粒子状物質が堆積してフィルタの流路抵抗が増大することを防止するため、捕獲した粒子状物質を除去してフィルタを再生させることが必要となる。
例えば特許文献１には、酸化触媒を含んだフィルタを備え、フィルタに炭化水素を供給して酸化、すなわち燃焼させることによって、フィルタが捕獲した粒子状物質を燃焼して除去する排ガス浄化装置が開示されている。これによれば、フィルタの上流側にある排気管に燃料噴射装置が設けられ、軽油を貯えた燃料タンクと燃料噴射装置とが燃料通路を介して接続される。燃料通路の途中には、内部に改質触媒を収容した改質装置が接続されており、改質装置内に導入された軽油が改質触媒によって改質され、フィルタの酸化触媒と反応しやすい炭化水素が生成される。また、改質装置には、排気管から分岐したバイパス通路が接続されており、改質装置内に排ガスを流通させて改質触媒を予熱することによって、改質触媒における軽油の改質を促進している。 In an exhaust gas purification device that captures particulate matter contained in exhaust gas with a filter provided in the middle of the exhaust pipe, the trapped particles are used to prevent particulate matter from accumulating and increasing the flow path resistance of the filter. It is necessary to regenerate the filter by removing the particulate matter.
For example, Patent Document 1 discloses an exhaust gas purifying apparatus that includes a filter containing an oxidation catalyst, and burns and removes particulate matter captured by the filter by supplying hydrocarbons to the filter and oxidizing, that is, burning. Has been. According to this, the fuel injection device is provided in the exhaust pipe on the upstream side of the filter, and the fuel tank storing the light oil and the fuel injection device are connected via the fuel passage. A reformer that contains a reforming catalyst is connected to the middle of the fuel passage, and light oil introduced into the reformer is reformed by the reforming catalyst and easily reacts with the oxidation catalyst of the filter. Hydrocarbons are produced. The reformer is connected to a bypass passage that branches off from the exhaust pipe, and promotes reforming of light oil in the reforming catalyst by preheating the reforming catalyst by circulating exhaust gas through the reforming device. is doing.

特開昭５９−１５５５２３号公報JP 59-155523 A

しかしながら、特許文献１に記載の排ガス浄化装置は、フィルタが捕獲した粒子状物質を除去するために、２つの触媒における反応、すなわち改質触媒における軽油の改質と、フィルタの酸化触媒における炭化水素の酸化とを必要としており、効率が悪いという問題点を有していた。   However, the exhaust gas purifying apparatus described in Patent Document 1 uses a reaction in two catalysts, that is, a reforming of light oil in a reforming catalyst and a hydrocarbon in an oxidation catalyst of the filter, in order to remove particulate matter captured by the filter. Therefore, there is a problem that the efficiency is low.

この発明は、このような問題点を解決するためになされたもので、フィルタが捕獲した粒子状物質を効率よく除去できる排ガス浄化装置を提供することを目的とする。   This invention was made in order to solve such a problem, and it aims at providing the exhaust gas purification apparatus which can remove the particulate matter which the filter captured efficiently.

この発明に係る排ガス浄化装置は、エンジンの排気管に設けられ、排ガス中に含まれる粒子状物質を捕獲するフィルタと、エンジンの排気管に設けられ、燃料を改質して反応熱を発生する改質触媒と、改質触媒に、燃料を供給するインジェクタとを備え、粒子状物質を浄化する排ガス浄化装置において、フィルタと改質触媒とに、直接接触する熱伝達部材をさらに備えることを特徴とするものである。
フィルタと改質触媒とに直接接触する熱伝達部材を設けたので、改質触媒の反応熱が、熱伝達部材を介して直接フィルタに伝達され、フィルタが、改質触媒の反応熱以外を必要とすることなく、粒子状物質を燃焼させて除去できる温度まで加熱される。したがって、フィルタが捕獲した粒子状物質を効率よく除去することが可能となる。 An exhaust gas purifying apparatus according to the present invention is provided in an exhaust pipe of an engine and is provided in a filter for capturing particulate matter contained in the exhaust gas and an exhaust pipe of the engine, and reforms fuel to generate reaction heat. An exhaust gas purification apparatus that includes a reforming catalyst and an injector that supplies fuel to the reforming catalyst and purifies particulate matter, and further includes a heat transfer member that directly contacts the filter and the reforming catalyst. It is what.
Since the heat transfer member that is in direct contact with the filter and the reforming catalyst is provided, the reaction heat of the reforming catalyst is directly transferred to the filter via the heat transfer member, and the filter requires heat other than the reaction heat of the reforming catalyst. Without heating, the particulate matter is heated to a temperature at which it can be removed by burning. Therefore, the particulate matter captured by the filter can be efficiently removed.

また、この発明に係る排ガス浄化装置は、エンジンの排気管に設けられ、排ガス中に含まれる粒子状物質を捕獲するフィルタと、エンジンの排気管に設けられ、燃料を改質して反応熱を発生する改質触媒と、改質触媒に、燃料を供給するインジェクタとを備え、粒子状物質を浄化する排ガス浄化装置において、フィルタと改質触媒とが、直接接触することを特徴とするものである。
フィルタと改質触媒とが直接接触しているため、改質触媒の反応熱が、直接フィルタに伝達され、フィルタが、改質触媒の反応熱以外を必要とすることなく、粒子状物質を燃焼させて除去できる温度まで加熱される。したがって、フィルタが捕獲した粒子状物質を効率よく除去することが可能となる。 An exhaust gas purifying apparatus according to the present invention is provided in an exhaust pipe of an engine, and is provided in a filter that captures particulate matter contained in the exhaust gas and an exhaust pipe of the engine, and reforms the fuel to generate reaction heat. An exhaust gas purifying apparatus that includes a generated reforming catalyst and an injector that supplies fuel to the reforming catalyst and purifies particulate matter, wherein the filter and the reforming catalyst are in direct contact with each other. is there.
Since the filter and the reforming catalyst are in direct contact, the reaction heat of the reforming catalyst is transferred directly to the filter, and the filter burns particulate matter without requiring anything other than the reaction heat of the reforming catalyst. And heated to a temperature that can be removed. Therefore, the particulate matter captured by the filter can be efficiently removed.

改質触媒が、フィルタを周方向に包囲してもよい。改質触媒の反応熱が、周方向からフィルタに伝達されるため、フィルタを効率よく加熱して粒子状物質を除去する効率をさらに向上することができる。
フィルタの、排ガスが流通する方向における上流側には、排ガスが流通するとともに、改質触媒の反応熱が伝達される昇温部材が設けられてもよい。改質触媒の反応熱が伝達されて、昇温部材を流通する排ガスの温度が上昇するため、フィルタを加熱して粒子状物質を除去する効率がさらに向上する。 The reforming catalyst may surround the filter in the circumferential direction. Since the reaction heat of the reforming catalyst is transmitted to the filter from the circumferential direction, the efficiency of efficiently heating the filter and removing the particulate matter can be further improved.
An upstream side of the filter in the direction in which the exhaust gas flows may be provided with a temperature raising member through which the exhaust gas flows and the reaction heat of the reforming catalyst is transmitted. Since the reaction heat of the reforming catalyst is transmitted and the temperature of the exhaust gas flowing through the temperature raising member rises, the efficiency of heating the filter and removing the particulate matter is further improved.

この発明によれば、排ガス浄化装置において、フィルタが捕獲した粒子状物質を効率よく除去することが実現できる。   According to the present invention, in the exhaust gas purification apparatus, it is possible to efficiently remove the particulate matter captured by the filter.

以下に、この発明の実施の形態について、添付図に基づいて説明する。
実施の形態１．
図１に、この実施の形態１に係る排ガス浄化装置の構成を示す。
ディーゼルエンジン１のシリンダヘッド１ａには、ディーゼルエンジン１内に吸気を導入する吸気マニフォルド２と、ディーゼルエンジン１の排ガスを外部に排出する排気マニフォルド３とが接続されている。排気マニフォルド３には排気管４が接続されており、ディーゼルエンジン１から排出された排ガスは、図１の矢印Ａで示される方向に流通する。排気管４の途中には、排ガス中に含まれる粒子状物質（ディーゼルパティキュレート、以下ＰＭと略称する）を捕獲するためのフィルタ５と、ディーゼルエンジン１の燃料である軽油を改質する改質触媒６とを内部に収容した改質器７が接続されている。改質器７には、改質器７の外部から内部に貫通し、改質器７内に軽油を噴射するインジェクタ８が設けられている。インジェクタ８は、燃料通路９を介して図示しない燃料タンクに接続されており、燃料タンク内に貯められた軽油を、改質器７の内部に噴射可能となっている。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
In FIG. 1, the structure of the exhaust gas purification apparatus which concerns on this Embodiment 1 is shown.
An intake manifold 2 that introduces intake air into the diesel engine 1 and an exhaust manifold 3 that discharges exhaust gas from the diesel engine 1 to the outside are connected to the cylinder head 1 a of the diesel engine 1. An exhaust pipe 4 is connected to the exhaust manifold 3, and exhaust gas discharged from the diesel engine 1 circulates in a direction indicated by an arrow A in FIG. In the middle of the exhaust pipe 4, a filter 5 for capturing particulate matter (diesel particulates, hereinafter abbreviated as PM) contained in the exhaust gas, and reforming for reforming diesel oil as fuel for the diesel engine 1. A reformer 7 in which the catalyst 6 is accommodated is connected. The reformer 7 is provided with an injector 8 that penetrates from the outside to the inside of the reformer 7 and injects light oil into the reformer 7. The injector 8 is connected to a fuel tank (not shown) via a fuel passage 9 and can inject the light oil stored in the fuel tank into the reformer 7.

図２に示すように、改質器７は中空の略円筒形状を有する金属製の容器であって、その両端側の径が漸次小さくなって、排気管４に接続されている。改質器７の内部には、ステンレス等の金属からなる熱伝達部材としての隔壁７ａが設けられている。この隔壁７ａは中空の円筒形状であり、隔壁７ａの内部には、円筒形状を有するフィルタ５が、その外周面５ａと隔壁７ａの内周面７ｂとが当接するように設けられている。フィルタ５は、例えばコージェライト等の、多孔質のセラミックスをハニカム状に形成したウォールフロー方式のフィルタであって、排ガス中の気体成分を下流側に通過させる際に、排ガス中に含まれるＰＭを捕獲する。   As shown in FIG. 2, the reformer 7 is a hollow metal container having a substantially cylindrical shape, and the diameters at both ends thereof are gradually reduced and connected to the exhaust pipe 4. Inside the reformer 7, a partition wall 7a as a heat transfer member made of metal such as stainless steel is provided. The partition wall 7a has a hollow cylindrical shape, and a filter 5 having a cylindrical shape is provided inside the partition wall 7a so that the outer peripheral surface 5a and the inner peripheral surface 7b of the partition wall 7a are in contact with each other. The filter 5 is a wall flow type filter formed of porous ceramics such as cordierite, for example, in a honeycomb shape. When the gas component in the exhaust gas is passed downstream, the PM contained in the exhaust gas is removed. To capture.

一方、隔壁７ａの外周面７ｃと、改質器７の内周面７ｄとの間には、中空の円筒形状を有する改質触媒６が、その内周面６ａと隔壁７ａの外周面７ｃとが当接し、且つ改質触媒６の外周面６ｂと改質器７の内周面７ｄとが当接するように設けられている。また、インジェクタ８は、改質器７の外周面７ｇから内周面７ｄに貫通し、且つ改質触媒６より上流側に軽油を噴射可能な位置に設けられている。改質触媒６は、例えばロジウム（Ｒｈ）等を含む触媒であって、軽油と排ガス中の酸素（Ｏ２）、水蒸気（Ｈ２Ｏ）とを反応させ、軽油を改質して一酸化炭素（ＣＯ）、水素（Ｈ２）、炭化水素（ＨＣ）を生成するとともに、約７００〜８００℃の反応熱を発生する。フィルタ５と改質触媒６とは、改質触媒６の内周部にフィルタ５が位置するように配置されている。したがって、フィルタ５と改質触媒６とは、改質触媒６が、フィルタ５を周方向の全周にわたって包囲（図３参照）するとともに、隔壁７ａが、フィルタ５と改質触媒６とに直接接触した状態となっている。すなわち、改質触媒６が軽油を改質する際に発生した反応熱は、隔壁７ａを介してフィルタ５に直接伝達されるようになっている。 On the other hand, between the outer peripheral surface 7c of the partition wall 7a and the inner peripheral surface 7d of the reformer 7, the reforming catalyst 6 having a hollow cylindrical shape is connected to the inner peripheral surface 6a and the outer peripheral surface 7c of the partition wall 7a. And the outer peripheral surface 6b of the reforming catalyst 6 and the inner peripheral surface 7d of the reformer 7 are in contact with each other. The injector 8 passes through the inner peripheral surface 7 d from the outer peripheral surface 7 g of the reformer 7 and is provided at a position where light oil can be injected upstream from the reforming catalyst 6. The reforming catalyst 6 is a catalyst containing, for example, rhodium (Rh), etc., and reacts light oil with oxygen (O 2 ) and water vapor (H 2 O) in exhaust gas to reform the light oil to produce carbon monoxide. (CO), hydrogen (H 2 ), and hydrocarbon (HC) are generated, and heat of reaction of about 700 to 800 ° C. is generated. The filter 5 and the reforming catalyst 6 are arranged so that the filter 5 is positioned on the inner peripheral portion of the reforming catalyst 6. Accordingly, the filter 5 and the reforming catalyst 6 are such that the reforming catalyst 6 surrounds the filter 5 over the entire circumference in the circumferential direction (see FIG. 3), and the partition wall 7a is directly between the filter 5 and the reforming catalyst 6. They are in contact. That is, the reaction heat generated when the reforming catalyst 6 reforms the light oil is directly transmitted to the filter 5 through the partition wall 7a.

図２に示すように、隔壁７ａの上流側の端部の外周面７ｃと、改質器７の上流側の内周面７ｄとの間には、周方向に開口する開口部７ｅが形成されている。また、隔壁７ａの下流側の端部の外周面７ｃと、改質器７の下流側の内周面７ｄとの間にも、周方向に開口する開口部７ｆが形成されている。すなわち、排気管４から改質器７内に流入した排ガスのうち、その大部分が隔壁７ａの内部を通ってフィルタ５を通過する一方で、残りの一部は開口部７ｅを通って、隔壁７ａの外周面７ｃと改質器７の内周面７ｄとの間に流入する構造となっている。隔壁７ａの外周面７ｃと改質器７の内周面７ｄとの間に流入した排ガスは、改質触媒６を通過した後に開口部７ｆを通り、フィルタ５を通過した排ガスと合流して改質器７の外部に排出される。   As shown in FIG. 2, an opening 7 e that opens in the circumferential direction is formed between the outer peripheral surface 7 c at the upstream end of the partition wall 7 a and the inner peripheral surface 7 d at the upstream side of the reformer 7. ing. An opening 7f that opens in the circumferential direction is also formed between the outer peripheral surface 7c at the downstream end of the partition wall 7a and the inner peripheral surface 7d at the downstream side of the reformer 7. That is, most of the exhaust gas flowing into the reformer 7 from the exhaust pipe 4 passes through the filter 5 through the inside of the partition wall 7a, while the remaining part passes through the opening 7e and passes through the partition wall 7a. The structure flows between the outer peripheral surface 7c of 7a and the inner peripheral surface 7d of the reformer 7. The exhaust gas flowing between the outer peripheral surface 7 c of the partition wall 7 a and the inner peripheral surface 7 d of the reformer 7 passes through the reforming catalyst 6, passes through the opening 7 f, and merges with the exhaust gas that has passed through the filter 5. It is discharged to the outside of the mass device 7.

以上のように、フィルタ５と改質触媒６とは、隔壁７ａによって隔てられた改質器７内に並列に配置されるとともに、隔壁７ａを介して接触した状態となっている。気体と比較すると、固体、すなわち隔壁７ａは熱伝導率が大きいため、改質触媒６が発生する反応熱が、効率よくフィルタ５に伝達される構造となっている。また、改質器７内に流入した排ガスの一部は、隔壁７ａの開口部７ｅを通って分岐され、隔壁７ａの外周面７ｃと改質器７の内周面７ｄとの間に設けられた改質触媒６を通過する構造となっている。   As described above, the filter 5 and the reforming catalyst 6 are arranged in parallel in the reformer 7 separated by the partition wall 7a and are in contact with each other via the partition wall 7a. Compared with gas, since the solid, that is, the partition wall 7a has a higher thermal conductivity, the reaction heat generated by the reforming catalyst 6 is transmitted to the filter 5 efficiently. A part of the exhaust gas flowing into the reformer 7 is branched through the opening 7e of the partition wall 7a, and is provided between the outer peripheral surface 7c of the partition wall 7a and the inner peripheral surface 7d of the reformer 7. The reforming catalyst 6 is passed through.

図１に戻って、改質器７の下流側にはＮＯｘ吸蔵還元触媒１０が接続されており、さらにその下流側には選択還元触媒１１が接続されている。ＮＯｘ吸蔵還元触媒１０は、バリウム（Ｂａ）等のアルカリ土類金属を吸蔵材として含む触媒であって、排ガスがリーン状態、すなわちインジェクタ８が軽油を噴射しておらず、排ガス中の空気濃度が高い状態である酸化雰囲気において、排ガス中に含まれる窒素酸化物（以下、ＮＯｘと略称する）を一時的に吸蔵する。一方、排ガスがリッチ状態、すなわちインジェクタ８が軽油を噴射して、排ガス中の空気濃度が低い状態である還元雰囲気において、ＮＯｘ吸蔵還元触媒１０は、改質触媒６が生成した一酸化炭素、水素、炭化水素を還元剤として反応し、吸蔵したＮＯｘを放出して窒素（Ｎ２）に還元するとともに、アンモニア（ＮＨ３）を生成する。また、選択還元触媒１１は、排ガス中に残留するＮＯｘを、ＮＯｘ吸蔵還元触媒１０が生成したアンモニアと反応させて窒素に還元する。 Returning to FIG. 1, a NOx occlusion reduction catalyst 10 is connected to the downstream side of the reformer 7, and a selective reduction catalyst 11 is connected to the downstream side thereof. The NOx occlusion reduction catalyst 10 is a catalyst containing an alkaline earth metal such as barium (Ba) as an occlusion material, and the exhaust gas is in a lean state, that is, the injector 8 is not injecting light oil, and the air concentration in the exhaust gas is low. In an oxidizing atmosphere that is in a high state, nitrogen oxides (hereinafter abbreviated as NOx) contained in the exhaust gas are temporarily occluded. On the other hand, in a reducing atmosphere in which the exhaust gas is rich, that is, the injector 8 injects light oil and the air concentration in the exhaust gas is low, the NOx occlusion reduction catalyst 10 has carbon monoxide, hydrogen produced by the reforming catalyst 6. The hydrocarbon reacts as a reducing agent, releases the stored NOx and reduces it to nitrogen (N 2 ), and generates ammonia (NH 3 ). Further, the selective reduction catalyst 11 reduces NOx remaining in the exhaust gas to nitrogen by reacting with ammonia generated by the NOx storage reduction catalyst 10.

次に、この実施の形態１に係る排ガス浄化装置の動作について説明する。
まず、インジェクタ８が軽油を噴射しておらず、改質器７内の排ガスがリーン状態である場合の動作について説明する。
図１に示すように、ディーゼルエンジン１から排出された排ガスは、排気マニフォルド３、排気管４を順次通り、改質器７内に流入する。改質器７内に流入した排ガスのうち、その大部分は隔壁７ａ（図２参照）の内部を通ってフィルタ５を通過し、この通過の際に、排ガス中に含まれるＰＭがフィルタ５に捕獲される。一方、改質器７内に流入した排ガスの一部は、開口部７ｅを通って隔壁７ａの外周面７ｃと改質器７の内周面７ｄとの間に流入するが、インジェクタ８は軽油を噴射していないため、改質触媒６における反応は起こらない。隔壁７ａの外周面７ｃと改質器７の内周面７ｄとの間に流入した排ガスは下流側の開口部７ｆを通り、隔壁７ａの内部を通ってフィルタ５を通過した排ガスと合流し、改質器７から排出される。 Next, the operation of the exhaust gas purifying apparatus according to the first embodiment will be described.
First, the operation when the injector 8 is not injecting light oil and the exhaust gas in the reformer 7 is in a lean state will be described.
As shown in FIG. 1, the exhaust gas discharged from the diesel engine 1 flows into the reformer 7 through the exhaust manifold 3 and the exhaust pipe 4 in order. Most of the exhaust gas flowing into the reformer 7 passes through the filter 5 through the inside of the partition wall 7a (see FIG. 2), and PM contained in the exhaust gas passes through the filter 5 during this passage. Be captured. On the other hand, a part of the exhaust gas flowing into the reformer 7 flows between the outer peripheral surface 7c of the partition wall 7a and the inner peripheral surface 7d of the reformer 7 through the opening 7e. Therefore, the reaction in the reforming catalyst 6 does not occur. The exhaust gas that flows between the outer peripheral surface 7c of the partition wall 7a and the inner peripheral surface 7d of the reformer 7 passes through the downstream opening 7f and merges with the exhaust gas that has passed through the filter 5 through the partition wall 7a. It is discharged from the reformer 7.

次いで、改質器７から排出された排ガスはＮＯｘ吸蔵還元触媒１０を通過する。ここで、インジェクタ８は軽油を噴射していないため、排ガスは酸化雰囲気にあり、排ガス中に含まれるＮＯｘがＮＯｘ吸蔵還元触媒１０に吸蔵される。また、ＮＯｘ吸蔵還元触媒を通過した排ガスは、選択還元触媒１１を通過するが、排ガスがリーン状態で酸化雰囲気にある場合、ＮＯｘ吸蔵還元触媒１０はアンモニアを生成しないため、選択還元触媒１１における反応は起きない。以上のように、排ガスがリーン状態である場合、排ガス中のＰＭはフィルタ５に捕獲され、ＮＯｘはＮＯｘ吸蔵還元触媒１０に吸蔵される。したがって、排ガス浄化装置の外部には、ＰＭやＮＯｘを含まない排ガスが排出される。   Next, the exhaust gas discharged from the reformer 7 passes through the NOx storage reduction catalyst 10. Here, since the injector 8 does not inject light oil, the exhaust gas is in an oxidizing atmosphere, and NOx contained in the exhaust gas is stored in the NOx storage reduction catalyst 10. Further, the exhaust gas that has passed through the NOx storage reduction catalyst passes through the selective reduction catalyst 11, but when the exhaust gas is in a lean state and in an oxidizing atmosphere, the NOx storage reduction catalyst 10 does not generate ammonia, so the reaction in the selective reduction catalyst 11 Will not happen. As described above, when the exhaust gas is in a lean state, PM in the exhaust gas is captured by the filter 5, and NOx is stored in the NOx storage reduction catalyst 10. Therefore, exhaust gas that does not contain PM or NOx is discharged outside the exhaust gas purification device.

次に、インジェクタ８が軽油を噴射して、改質器７内の排ガスがリッチ状態になった場合の動作を説明する。
フィルタ５に捕獲されたＰＭが堆積して所定の量になると、インジェクタ８が軽油を噴射し、改質触媒６に軽油を供給する。改質触媒６は、開口部７ｅを通って隔壁７ａの外周面７ｃと改質器７の内周面７ｄとの間に流入した排ガス中の酸素と、インジェクタ８から供給された軽油とを反応させて軽油を改質し、一酸化炭素を生成するとともに、約７００〜８００℃の反応熱を発生する。ここで、フィルタ５と改質触媒６とは、隔壁７ａを介して接触しているため、改質触媒６が発生した反応熱がフィルタ５に直接伝達され、フィルタ５が加熱される。フィルタ５が加熱されてその温度が上昇すると、フィルタ５に捕獲されていたＰＭが燃焼して除去され、フィルタ５が再生される。 Next, the operation when the injector 8 injects light oil and the exhaust gas in the reformer 7 becomes rich will be described.
When PM trapped in the filter 5 accumulates and reaches a predetermined amount, the injector 8 injects light oil and supplies the reformed catalyst 6 with light oil. The reforming catalyst 6 reacts the oxygen in the exhaust gas flowing between the outer peripheral surface 7c of the partition wall 7a and the inner peripheral surface 7d of the reformer 7 through the opening 7e and the light oil supplied from the injector 8. The gas oil is reformed to generate carbon monoxide and generate heat of reaction of about 700 to 800 ° C. Here, since the filter 5 and the reforming catalyst 6 are in contact with each other via the partition wall 7a, the reaction heat generated by the reforming catalyst 6 is directly transmitted to the filter 5 and the filter 5 is heated. When the filter 5 is heated and its temperature rises, PM trapped in the filter 5 is burned and removed, and the filter 5 is regenerated.

隔壁７ａの外周面７ｃと改質器７の内周面７ｄとの間に流入した排ガスと、改質触媒６が生成した一酸化炭素、水素、炭化水素とは、下流側の開口部７ｆを通り、隔壁７ａ内のフィルタ５を通過した排ガスと合流して改質器７の外部に排出され、ＮＯｘ吸蔵還元触媒１０を通過する。ＮＯｘ吸蔵還元触媒１０は、改質触媒６が生成した一酸化炭素、水素、炭化水素を還元剤として反応し、排ガスが酸化雰囲気にあるときに吸蔵したＮＯｘを放出して窒素に還元するとともに、アンモニアを生成する。また、選択還元触媒１１は、ＮＯｘ吸蔵還元触媒１０で還元されず、排ガス中に残留しているＮＯｘが存在する場合に、ＮＯｘ吸蔵還元触媒１０が生成したアンモニアとＮＯｘとを反応させて窒素に還元する。   The exhaust gas flowing between the outer peripheral surface 7c of the partition wall 7a and the inner peripheral surface 7d of the reformer 7 and the carbon monoxide, hydrogen, and hydrocarbons generated by the reforming catalyst 6 pass through the downstream opening 7f. As a result, the exhaust gas that has passed through the filter 5 in the partition wall 7 a merges and is discharged to the outside of the reformer 7, and passes through the NOx storage reduction catalyst 10. The NOx occlusion reduction catalyst 10 reacts with the carbon monoxide, hydrogen, and hydrocarbon generated by the reforming catalyst 6 as a reducing agent, releases the NOx occluded when the exhaust gas is in an oxidizing atmosphere, and reduces it to nitrogen, Ammonia is produced. Further, the selective reduction catalyst 11 is not reduced by the NOx storage reduction catalyst 10, and when NOx remaining in the exhaust gas exists, the ammonia produced by the NOx storage reduction catalyst 10 reacts with NOx to form nitrogen. Reduce.

このように、改質器７内に、フィルタ５と改質触媒６とに直接接触する隔壁７ａを設けたので、改質触媒６が軽油を改質する際に発生する反応熱が、隔壁７ａを介して直接フィルタ５に伝達される。フィルタ５は、改質触媒６の反応熱以外を必要とすることなく、ＰＭを燃焼させて除去できる温度まで加熱される。したがって、フィルタ５が捕獲したＰＭを効率よく除去することが可能となる。
また、改質触媒６が、フィルタ５を周方向に包囲するように構成したので、改質触媒６の反応熱が、周方向からフィルタ５に伝達される。したがって、フィルタ５を効率よく加熱してＰＭを除去する効率をさらに向上することができる。 Thus, since the partition wall 7a that is in direct contact with the filter 5 and the reforming catalyst 6 is provided in the reformer 7, the reaction heat generated when the reforming catalyst 6 reforms light oil is generated by the partition wall 7a. Is directly transmitted to the filter 5 via the. The filter 5 is heated to a temperature at which PM can be burned and removed without requiring heat other than the reaction heat of the reforming catalyst 6. Therefore, the PM captured by the filter 5 can be efficiently removed.
Further, since the reforming catalyst 6 is configured to surround the filter 5 in the circumferential direction, the reaction heat of the reforming catalyst 6 is transmitted to the filter 5 from the circumferential direction. Therefore, the efficiency of efficiently heating the filter 5 and removing PM can be further improved.

実施の形態２．
次に、この発明の実施の形態２に係る排ガス浄化装置について説明する。この実施の形態２に係る排ガス浄化装置は、実施の形態１に対して、フィルタと改質触媒とを、熱伝達部材である隔壁を介さずに直接接触させたものである。尚、以下の実施の形態において、図１〜３の参照符号と同一の符号は、同一または同様な構成要素であるので、その詳細な説明は省略する。
図４に、この実施の形態２に係る排ガス浄化装置の改質器１７を示す。改質器１７は中空の略円筒形状を有する金属製の容器であって、その外形は、実施の形態１における改質器７と同様である。改質器１７の内部における上流側には、中空の円筒形状を有する隔壁１７ａが、その下流側の端部１７ｂが改質器１７内の軸方向における中間部近傍に位置するように設けられており、改質器１７の内部を２つに隔てている。 Embodiment 2. FIG.
Next, an exhaust gas purification apparatus according to Embodiment 2 of the present invention will be described. In the exhaust gas purifying apparatus according to the second embodiment, the filter and the reforming catalyst are directly brought into contact with the first embodiment without passing through the partition walls that are heat transfer members. In the following embodiments, the same reference numerals as those in FIGS. 1 to 3 are the same or similar components, and thus detailed description thereof is omitted.
FIG. 4 shows a reformer 17 of the exhaust gas purifying apparatus according to the second embodiment. The reformer 17 is a hollow metal container having a substantially cylindrical shape, and the outer shape thereof is the same as that of the reformer 7 in the first embodiment. On the upstream side in the reformer 17, a partition wall 17a having a hollow cylindrical shape is provided so that the downstream end portion 17b is positioned in the vicinity of the intermediate portion in the axial direction in the reformer 17. The interior of the reformer 17 is divided into two parts.

隔壁１７ａの下流側には、円筒形状を有するフィルタ１５が、その上流側の端部１５ａと隔壁１７ａの下流側の端部１７ｂとが接触するように設けられている。フィルタ１５は、実施の形態１におけるフィルタ５と同様のウォールフロー方式のフィルタであって、排ガス中の気体成分を下流側に通過させる際に、排ガス中に含まれるＰＭを捕獲する。また、フィルタ１５の外周面１５ｂと改質器１７の内周面１７ｃとの間には、中空の円筒形状を有する改質触媒１６が、その内周面１６ａとフィルタ１５の外周面１５ｂとが接触し、且つ改質触媒１６の外周面１６ｂと改質器１７の内周面１７ｃとが接触するように設けられている。改質触媒１６は、実施の形態１における改質触媒６と同様の触媒であって、軽油と排ガス中の酸素、水蒸気とを反応させ、軽油を改質して一酸化炭素、水素、炭化水素を生成するとともに、約７００〜８００℃の反応熱を発生する。すなわち、改質触媒１６が軽油を改質する際に発生した反応熱が、フィルタ１５に直接伝達されるようになっている。   A filter 15 having a cylindrical shape is provided on the downstream side of the partition wall 17a so that the upstream end portion 15a and the downstream end portion 17b of the partition wall 17a are in contact with each other. The filter 15 is a wall flow type filter similar to the filter 5 in the first embodiment, and captures PM contained in the exhaust gas when passing the gas component in the exhaust gas downstream. Further, between the outer peripheral surface 15 b of the filter 15 and the inner peripheral surface 17 c of the reformer 17, the reforming catalyst 16 having a hollow cylindrical shape has an inner peripheral surface 16 a and an outer peripheral surface 15 b of the filter 15. The outer peripheral surface 16b of the reforming catalyst 16 and the inner peripheral surface 17c of the reformer 17 are provided in contact with each other. The reforming catalyst 16 is the same catalyst as the reforming catalyst 6 in the first embodiment, and reacts light oil with oxygen and water vapor in the exhaust gas to reform the light oil to carbon monoxide, hydrogen, hydrocarbons. And a heat of reaction of about 700 to 800 ° C. is generated. That is, reaction heat generated when the reforming catalyst 16 reforms the light oil is directly transmitted to the filter 15.

隔壁１７ａの上流側の端部の外周面１７ｄと、改質器１７の上流側の内周面１７ｃとの間には、周方向に開口する開口部１７ｅが形成されている。すなわち、排気管４から改質器１７内に流入した排ガスのうち、その大部分が隔壁１７ａの内部を通ってフィルタ１５を通過する一方で、残りの一部は開口部１７ｅを通って、隔壁１７ａの外周面１７ｄと改質器１７の内周面１７ｃとの間に流入する構造となっている。隔壁１７ａの外周面１７ｄと改質器１７の内周面１７ｃとの間に流入した排ガスは、改質触媒１６を通過した後に、フィルタ１５を通過した排ガスと合流して改質器１７の外部に排出される。その他の構成については、実施の形態１と同様である。
以上のように、フィルタ１５と改質触媒１６とを、直接接触させたため、改質触媒１６の反応熱が、直接フィルタ１５に伝達され、フィルタ１５が、改質触媒１６の反応熱以外を必要とすることなく、ＰＭを燃焼させて除去できる温度まで加熱される。したがって、実施の形態１と同様に、フィルタが捕獲したＰＭを効率よく除去することが可能となる。 Between the outer peripheral surface 17d at the upstream end of the partition wall 17a and the inner peripheral surface 17c at the upstream side of the reformer 17, an opening 17e that opens in the circumferential direction is formed. That is, most of the exhaust gas flowing into the reformer 17 from the exhaust pipe 4 passes through the filter 15 through the inside of the partition wall 17a, while the remaining part passes through the opening 17e to pass through the partition wall. The structure flows between the outer peripheral surface 17d of 17a and the inner peripheral surface 17c of the reformer 17. The exhaust gas that flows between the outer peripheral surface 17d of the partition wall 17a and the inner peripheral surface 17c of the reformer 17 passes through the reforming catalyst 16, and then merges with the exhaust gas that has passed through the filter 15 to the outside of the reformer 17. To be discharged. Other configurations are the same as those in the first embodiment.
As described above, since the filter 15 and the reforming catalyst 16 are in direct contact with each other, the reaction heat of the reforming catalyst 16 is directly transmitted to the filter 15, and the filter 15 needs other than the reaction heat of the reforming catalyst 16. Without heating, it is heated to a temperature at which PM can be burned and removed. Therefore, similarly to the first embodiment, it is possible to efficiently remove PM captured by the filter.

実施の形態３．
次に、この発明の実施の形態３に係る排ガス浄化装置について説明する。
図５に、この実施の形態３に係る排ガス浄化装置の改質器７を示す。
改質器７の内部において、隔壁７ａ内で、且つフィルタ５の上流側に位置する部位には、ステンレス等の金属からなる昇温部材２１が設けられている。昇温部材２１は、中空の円筒形状の外周部２１ａと、外周部２１ａの内部に設けられる網状のメッシュ部２１ｃとから構成されており、外周部２１ａの外周面２１ｂと隔壁７ａの内周面７ｂとが当接している。メッシュ部２１ｃは、図５に示すように、軸方向に延びるように形成されており、隔壁７ａ内を流れる排ガスが、メッシュ部２１ｃを通過した後に、フィルタ５を通過するようになっている。また、昇温部材２１は、改質触媒６と隔壁７ａを介して接触した状態となっている。その他の構成については、実施の形態１と同様である。 Embodiment 3 FIG.
Next, an exhaust gas purification apparatus according to Embodiment 3 of the present invention will be described.
FIG. 5 shows a reformer 7 of the exhaust gas purifying apparatus according to the third embodiment.
Inside the reformer 7, a temperature raising member 21 made of a metal such as stainless steel is provided in a portion located in the partition wall 7 a and upstream of the filter 5. The temperature raising member 21 includes a hollow cylindrical outer peripheral portion 21a and a net-like mesh portion 21c provided inside the outer peripheral portion 21a. The outer peripheral surface 21b of the outer peripheral portion 21a and the inner peripheral surface of the partition wall 7a. 7b is in contact. As shown in FIG. 5, the mesh portion 21c is formed to extend in the axial direction, and the exhaust gas flowing through the partition wall 7a passes through the filter 5 after passing through the mesh portion 21c. Further, the temperature raising member 21 is in contact with the reforming catalyst 6 via the partition wall 7a. Other configurations are the same as those in the first embodiment.

このように、フィルタ５の上流側である隔壁内に、隔壁７ａを介して改質触媒６と接触するように配置されるとともに、内部を排ガスが流通可能である昇温部材２１を設けたので、改質触媒６の反応熱により昇温部材２１が加熱され、昇温部材２１の内部に形成されたメッシュ部２１ｃを通過する排ガスの温度が上昇する。すなわち、フィルタ５は、隔壁７ａを介して改質触媒６から直接伝達される反応熱の他に、メッシュ部２１ｃを通過した排ガスによっても加熱される。したがって、フィルタ５を加熱する効率が向上するため、フィルタ５が捕獲したＰＭを燃焼させて除去する効率を、さらに向上することが可能となる。   As described above, the temperature raising member 21 is provided in the partition wall upstream of the filter 5 so as to be in contact with the reforming catalyst 6 through the partition wall 7a and the exhaust gas can be circulated therein. The temperature raising member 21 is heated by the reaction heat of the reforming catalyst 6, and the temperature of the exhaust gas passing through the mesh portion 21c formed inside the temperature raising member 21 rises. That is, the filter 5 is heated not only by the reaction heat directly transmitted from the reforming catalyst 6 via the partition wall 7a but also by the exhaust gas that has passed through the mesh portion 21c. Therefore, since the efficiency of heating the filter 5 is improved, the efficiency of burning and removing the PM captured by the filter 5 can be further improved.

実施の形態１、２において、改質器の内部を隔壁により２つに隔てたが、その数を限定するものではなく、例えば、異なる径を有する隔壁を同心円状に複数形成し、フィルタと改質触媒とを交互に配置した多層構造とすることも可能である。
実施の形態１、２において、改質器内の隔壁に開口部を形成し、排ガスの一部が隔壁の外周面と改質器の内周面との間に流入するように構成したが、排ガスが隔壁の外周面と改質器の内周面との間に常時流入することに限定するものではない。例えば、改質器の上流側に形成された開口部を開閉するバルブを設け、軽油を改質する場合のみ、バルブを開弁して排ガスを通すように構成することも可能である。
また、実施の形態１、２において、改質触媒がフィルタを周方向の全周にわたって包囲したが、全周にわたって包囲することに限定するものではなく、周方向における一部が欠けた状態で包囲することも可能である。 In the first and second embodiments, the interior of the reformer is divided into two by partition walls, but the number is not limited. For example, a plurality of partition walls having different diameters are formed concentrically to improve the filter. It is also possible to have a multilayer structure in which the catalyst is alternately arranged.
In the first and second embodiments, an opening is formed in the partition wall in the reformer, and a part of the exhaust gas is configured to flow between the outer peripheral surface of the partition wall and the inner peripheral surface of the reformer. The exhaust gas is not limited to constantly flowing between the outer peripheral surface of the partition wall and the inner peripheral surface of the reformer. For example, a valve that opens and closes an opening formed on the upstream side of the reformer may be provided, and only when reforming light oil, the valve may be opened to allow exhaust gas to pass.
Further, in the first and second embodiments, the reforming catalyst surrounds the filter over the entire circumference, but it is not limited to surrounding the filter over the entire circumference. It is also possible to do.

この発明の実施の形態１に係る排ガス浄化装置の構成を示す概略図である。It is the schematic which shows the structure of the exhaust gas purification apparatus which concerns on Embodiment 1 of this invention. 実施の形態１に係る改質器の構成を示す断面側面図である。2 is a cross-sectional side view showing a configuration of a reformer according to Embodiment 1. 実施の形態１に係る改質器の、図２のＩＩＩ−ＩＩＩ断面を示す断面正面図である。3 is a cross-sectional front view showing the III-III cross section of FIG. 2 of the reformer according to Embodiment 1. FIG. この発明の実施の形態２に係る排ガス浄化装置の改質器の構成を示す断面側面図である。It is a cross-sectional side view which shows the structure of the reformer of the exhaust gas purification apparatus which concerns on Embodiment 2 of this invention. この発明の実施の形態３に係る排ガス浄化装置の改質器の構成を示す断面側面図である。It is a cross-sectional side view which shows the structure of the reformer of the exhaust gas purification apparatus which concerns on Embodiment 3 of this invention. 実施の形態３に係る改質器の、図５のＩＶ−ＩＶ断面を示す断面正面図である。It is a cross-sectional front view which shows the IV-IV cross section of FIG. 5 of the reformer which concerns on Embodiment 3. FIG.

符号の説明Explanation of symbols

１ ディーゼルエンジン（エンジン）、４ 排気管、５，１５ フィルタ、６，１６ 改質触媒、７ａ 隔壁（熱伝達部材）、８ インジェクタ、２１ 昇温部材。   DESCRIPTION OF SYMBOLS 1 Diesel engine (engine), 4 exhaust pipe, 5,15 filter, 6,16 reforming catalyst, 7a partition (heat transfer member), 8 injector, 21 temperature rising member

Claims (4)

エンジンの排気管に設けられ、排ガス中に含まれる粒子状物質を捕獲するフィルタと、
前記エンジンの前記排気管に設けられ、燃料を改質して反応熱を発生する改質触媒と、
前記改質触媒に、前記燃料を供給するインジェクタと
を備え、前記粒子状物質を浄化する排ガス浄化装置において、
前記フィルタと前記改質触媒とに、直接接触する熱伝達部材をさらに備えることを特徴とする排ガス浄化装置。 A filter provided in the exhaust pipe of the engine for capturing particulate matter contained in the exhaust gas;
A reforming catalyst that is provided in the exhaust pipe of the engine and generates reaction heat by reforming the fuel;
In the exhaust gas purification apparatus for purifying the particulate matter, comprising an injector for supplying the fuel to the reforming catalyst,
An exhaust gas purification apparatus, further comprising a heat transfer member in direct contact with the filter and the reforming catalyst. エンジンの排気管に設けられ、排ガス中に含まれる粒子状物質を捕獲するフィルタと、
前記エンジンの前記排気管に設けられ、燃料を改質して反応熱を発生する改質触媒と、
前記改質触媒に、前記燃料を供給するインジェクタと
を備え、前記粒子状物質を浄化する排ガス浄化装置において、
前記フィルタと前記改質触媒とが、直接接触することを特徴とする排ガス浄化装置。 A filter provided in the exhaust pipe of the engine for capturing particulate matter contained in the exhaust gas;
A reforming catalyst that is provided in the exhaust pipe of the engine and generates reaction heat by reforming the fuel;
In the exhaust gas purification apparatus for purifying the particulate matter, comprising an injector for supplying the fuel to the reforming catalyst,
The exhaust gas purifying apparatus, wherein the filter and the reforming catalyst are in direct contact. 前記改質触媒が、前記フィルタを周方向に包囲する請求項１または２に記載の排ガス浄化装置。   The exhaust gas purification apparatus according to claim 1 or 2, wherein the reforming catalyst surrounds the filter in a circumferential direction. 前記フィルタの、前記排ガスが流通する方向における上流側には、前記排ガスが流通するとともに、前記改質触媒の反応熱が伝達される昇温部材が設けられる請求項１〜３のいずれか一項に記載の排ガス浄化装置。   The temperature rising member which the reaction heat of the said reforming catalyst is transmitted while the said exhaust gas distribute | circulates is provided in the upstream in the direction in which the said exhaust gas distribute | circulates the said filter. The exhaust gas purification apparatus according to 1.
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