WO2012164722A1 - Exhaust purification device for internal combustion engine - Google Patents

Exhaust purification device for internal combustion engine Download PDF

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Publication number
WO2012164722A1
WO2012164722A1 PCT/JP2011/062704 JP2011062704W WO2012164722A1 WO 2012164722 A1 WO2012164722 A1 WO 2012164722A1 JP 2011062704 W JP2011062704 W JP 2011062704W WO 2012164722 A1 WO2012164722 A1 WO 2012164722A1
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Prior art keywords
gas flow
exhaust
flow forming
internal combustion
combustion engine
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PCT/JP2011/062704
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French (fr)
Japanese (ja)
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隆徳 中野
佐藤　正明
小田　富久
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トヨタ自動車株式会社
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Application filed by トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Priority to PCT/JP2011/062704 priority Critical patent/WO2012164722A1/en
Priority to JP2013517777A priority patent/JPWO2012164722A1/en
Priority to EP11866883.9A priority patent/EP2716884A4/en
Publication of WO2012164722A1 publication Critical patent/WO2012164722A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • 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
    • F01N3/24—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
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431974—Support members, e.g. tubular collars, with projecting baffles fitted inside the mixing tube or adjacent to the inner wall
    • 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
    • F01N2240/20—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 flow director or deflector
    • 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
    • F01N2610/00—Adding substances to 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
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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]

Definitions

  • the present invention relates to an exhaust purification device for an internal combustion engine.
  • a technology that includes a disperser for dispersing urea water between the selective reduction type NOx catalyst and the injection valve It is known (for example, refer to Patent Document 1). Since the exhaust gas and the urea water are swirled by the disperser, mixing and vaporization of the urea water and the exhaust gas are promoted.
  • Patent Document 3 a technique for providing a space between the disperser and the exhaust pipe is known (for example, see Patent Document 3).
  • the reducing agent in the exhaust gas may be directed to the wall surface of the exhaust passage.
  • urea water in the exhaust gas may be biased near the wall surface of the exhaust pipe due to centrifugal force.
  • urea water adheres to the wall surface of an exhaust pipe there exists a possibility that the deposit derived from urea may accumulate on the wall surface of an exhaust pipe.
  • An object of the present invention is to suppress the bias of the additive supplied into the exhaust gas from the internal combustion engine and to disperse the additive more uniformly.
  • an exhaust gas purification apparatus for an internal combustion engine comprises: An exhaust purification catalyst provided in the exhaust passage of the internal combustion engine; A supply unit that is provided in an exhaust passage upstream of the exhaust purification catalyst and supplies an additive to the exhaust purification catalyst; A dispersion part that is provided between the exhaust purification catalyst and the supply part and disperses the additive;
  • An exhaust gas purification apparatus for an internal combustion engine comprising: The dispersion unit includes a first gas flow forming unit and a second gas flow forming unit, The first gas flow forming unit and the second gas flow forming unit are a first gas flow that has passed through the first gas flow forming unit, and a second gas flow that has passed through the second gas flow forming unit, Are formed to interfere with each other.
  • the additive when the additive is supplied from the supply unit, the additive flows into the dispersion unit.
  • the flow direction of the exhaust gas may be changed, or the turbulence of the exhaust gas may be increased.
  • the first gas flow that has passed through the first gas flow forming portion and the second gas flow that has passed through the second gas flow forming portion interfere with each other on the downstream side of the dispersion portion.
  • the two gas flows interfere with each other, and the bias of the additive is reduced as compared with the case where it is assumed that the first gas flow or the second gas flow flows independently. Thereby, it can suppress that an additive is biased to the wall surface vicinity of an exhaust passage.
  • the first gas flow forming portion is provided at a central portion of the dispersion portion, and the second gas flow forming portion is disposed outside the central portion with the first gas flow forming portion. May be provided independently.
  • the additive may be supplied so as to pass only through the first gas flow forming part, or may be supplied so as to pass through the first gas flow forming part and the second gas flow forming part. That is, the additive may be supplied so that the additive is included in at least the first gas stream.
  • the first gas flow forming portion is provided on the central axis side of the exhaust passage
  • the second gas flow forming portion is provided on the wall surface side of the exhaust passage from the first gas flow forming portion.
  • the second gas flow forming part may be a space between the first gas flow forming part and the wall surface of the exhaust passage.
  • a swirl flow swirling around the central axis of the exhaust passage is generated. This swirling flow may be generated only in the first gas flow forming section.
  • the turbulence of the exhaust gas may be strengthened by changing the flow direction of the exhaust gas in the dispersion portion.
  • the cross-sectional area of the exhaust passage formed in the first gas flow forming portion may be larger than the cross-sectional area of the exhaust passage formed in the second gas flow forming portion.
  • the resistance of the exhaust gas becomes larger in the first gas flow forming portion than in the second gas flow forming portion.
  • the speed of the second gas flow is higher than the speed of the first gas flow.
  • the first gas flow is pushed back from the wall surface side of the exhaust passage to the central axis side of the exhaust passage by the second gas flow, so that the first gas flow is further prevented from moving toward the wall surface of the exhaust passage. can do. Thereby, it can suppress more that an additive is biased to the wall surface vicinity of an exhaust passage.
  • the second gas flow forming portion has a flow direction of the exhaust gas passing through the second gas flow forming portion in a direction toward the central axis of the exhaust passage, or a wall surface of the exhaust passage. You may form so that it may become parallel.
  • the first gas flow can be pushed back toward the central axis of the exhaust passage by the second gas flow. For this reason, it can suppress that a 1st gas flow goes to the wall surface of an exhaust passage. Thereby, it can suppress more that an additive is biased to the wall surface vicinity of an exhaust passage.
  • FIG. 1 is a diagram showing a schematic configuration of an exhaust gas purification apparatus for an internal combustion engine according to the present embodiment.
  • the internal combustion engine 1 shown in FIG. 1 may be a diesel engine or a gasoline engine.
  • the exhaust passage 2 is connected to the internal combustion engine 1.
  • An exhaust purification catalyst 3 (hereinafter simply referred to as “catalyst 3”) is provided in the middle of the exhaust passage 2.
  • the catalyst 3 is a catalyst whose temperature rises, exhaust gas is purified, or purification ability is restored by supplying an additive.
  • Examples of the catalyst 3 include an occlusion reduction type NOx catalyst, a selective reduction type NOx catalyst, a three-way catalyst, an oxidation catalyst, and a hydrolysis catalyst.
  • the catalyst 3 may be a catalyst having an oxidation function.
  • a particulate filter that collects particulate matter may be provided, and the particulate filter may be used as the carrier of the catalyst 3. Moreover, you may arrange
  • an injection valve 4 for injecting the additive into the exhaust is provided.
  • the additive can be, for example, a reducing agent or an oxidizing agent.
  • fuel, urea water, or ammonia can be used as the additive. What is used as the additive depends on the type of the catalyst 3.
  • the injection valve 4 corresponds to the supply unit in the present invention.
  • a disperser 5 for dispersing the additive in the exhaust gas is provided in the exhaust passage downstream of the injection valve 4 and upstream of the catalyst 3.
  • the disperser 5 corresponds to the disperser in the present invention.
  • FIG. 2 is a view of the disperser 5 viewed from the upstream side in the exhaust flow direction.
  • FIG. 3 is a cross-sectional view of the disperser 5 cut in parallel with the exhaust flow direction.
  • the disperser 5 includes a cylindrical portion 51 that has an outer diameter smaller than the inner diameter of the exhaust passage 2 and is formed in a hollow cylindrical shape coaxial with the central axis of the exhaust passage 2.
  • a plurality of plates 52 having the same shape extend from the inner peripheral surface of the cylindrical portion 51 toward the central axis.
  • the plurality of plates 52 are arranged radially at equal angles around the central axis of the cylindrical portion 51.
  • the central axis of each plate 52 extending from the inner peripheral surface of the cylindrical portion 51 to the tip of the plate 52 is orthogonal to the central axis direction of the cylindrical portion 51.
  • the length from the inner peripheral surface of the cylinder part 51 to the tip of the plate 52 is smaller than the radius of the cylinder part 51, and the plates 52 are provided so as not to contact each other.
  • Each plate 52 is inclined at a predetermined angle with respect to the central axis of the cylindrical portion 51.
  • a gap is provided between the plate 52 and the plate 52 so that the exhaust can circulate.
  • the exhaust may be more disturbed, or another member for turning the exhaust may be provided.
  • a single plate may be provided closer to the central axis than the cylinder portion 51. A plurality of holes may be provided in this plate.
  • a plurality of fixing portions 53 are provided outside the tube portion 51 to connect the outer wall of the tube portion 51 and the inner wall of the exhaust passage 2 to fix the tube portion 51 in the exhaust passage 2. .
  • a space in which exhaust gas can flow is provided between the cylinder portion 51 and the exhaust passage 2.
  • the exhaust gas circulates inside the cylinder part 51 and outside the cylinder part 51, respectively.
  • the inner side of the cylindrical part 51 is referred to as a first gas flow forming part 54
  • the outer side of the cylindrical part 51 is referred to as a second gas flow forming part 55.
  • the gas flow passing through the first gas flow forming unit 54 is referred to as a first gas flow
  • the gas flow passing through the second gas flow forming unit 55 is referred to as a second gas flow.
  • the flow direction of the exhaust gas is changed by the plurality of plates 52, and the exhaust gas turns around the central axis of the exhaust passage 2. If it does so, when an additive is supplied toward the 1st gas flow formation part 54, an additive will disperse
  • the additive in the first gas flow may be biased toward the wall surface of the exhaust passage 2 due to centrifugal force.
  • the first gas is formed so that the cross-sectional area of the exhaust passage formed in the first gas flow forming portion 54 is larger than the cross-sectional area of the exhaust passage formed in the second gas flow forming portion 55.
  • a flow forming portion 54 and a second gas flow forming portion 55 are formed.
  • the resistance of the exhaust gas is higher in the first gas flow forming portion 54 than in the second gas flow forming portion 55. That is, the first gas flow forming unit 54 and the first gas flow forming unit 54 are configured such that the resistance when the exhaust gas passes through the first gas flow forming unit 54 is larger than the resistance when the exhaust gas passes through the second gas flow forming unit 55.
  • a two-gas flow forming portion 55 is formed.
  • the speed of the second gas flow is higher than the speed of the first gas flow.
  • the first gas flow is pushed back from the wall surface side of the exhaust passage 2 to the central axis side of the exhaust passage 2 by the second gas flow. Therefore, it is possible to suppress the additive from being biased toward the wall surface side of the exhaust passage 2.
  • the optimum shapes of the first gas flow forming portion 54 and the second gas flow forming portion 55 can be obtained by experiments or the like.
  • the second gas flow forming portion 55 is formed so that the flow direction of the exhaust gas passing through the second gas flow forming portion 55 is away from or parallel to the wall surface of the exhaust passage 2. That is, the second gas flow is prevented from moving toward the wall surface of the exhaust passage 2.
  • the resistance when the exhaust gas passes through the first gas flow forming portion 54 is larger than the resistance when the exhaust gas passes through the second gas flow forming portion 55, so that the second gas flow is exhausted. It proceeds in the direction of the central axis of the passage 2. Thereby, it can suppress that a 1st gas flow goes to the wall surface of the exhaust passage 2.
  • the first gas flow and the second gas flow interfere with each other on the downstream side of the disperser 5 so that the additive can be prevented from being biased to the vicinity of the wall surface of the exhaust passage 2.
  • the additive can be dispersed at a short distance, the distance between the disperser 5 and the catalyst 3 can be reduced. Therefore, it is easier to install the disperser 5 than in the prior art.
  • the additive can be prevented from being biased to the vicinity of the wall surface of the exhaust passage 2, an appropriate amount of the additive can be supplied also to the vicinity of the central axis of the catalyst 3. Thereby, the purification performance of exhaust gas can be improved.

Abstract

The objective of the present invention is to suppress biasing of an additive supplied into the exhaust from an internal combustion engine, thus more evenly dispersing the additive. Thus, this exhaust purification device for an internal combustion engine is provided with: an exhaust purification catalyst that is provided to the exhaust pathway of the internal combustion engine; a supply section that supplies the additive to the exhaust purification catalyst; and a dispersion section (5) that disperses the additive and is provided between the exhaust purification catalyst and the supply section. The dispersion section (5) is provided with a first gas flow forming section (54) and a second gas flow forming section (55). The first gas flow forming section (54) and the second gas flow forming section (55) are formed in a manner so as to cause the mutual interference of a first gas flow that has passed through the first gas flow forming section (54) and a second gas flow that has passed through the second gas flow forming section (55).

Description

内燃機関の排気浄化装置Exhaust gas purification device for internal combustion engine
　本発明は、内燃機関の排気浄化装置に関する。 The present invention relates to an exhaust purification device for an internal combustion engine.
　選択還元型ＮＯx触媒と、尿素水を噴射する噴射弁と、を備えたＳＣＲシステムにおいて、選択還元型ＮＯx触媒と、噴射弁との間に、尿素水を分散させるための分散器を備える技術が知られている（例えば、特許文献１参照。）。この分散器により排気及び尿素水が旋回するため、尿素水と排気との混合及び気化が促進される。 In a SCR system that includes a selective reduction type NOx catalyst and an injection valve that injects urea water, a technology that includes a disperser for dispersing urea water between the selective reduction type NOx catalyst and the injection valve. It is known (for example, refer to Patent Document 1). Since the exhaust gas and the urea water are swirled by the disperser, mixing and vaporization of the urea water and the exhaust gas are promoted.
　また、分散器の外周側にのみに排気を流通させる技術が知られている（例えば、特許文献２参照。）。この技術では、分散器の中心部を排気の流れ方向の下流側に向けた凸形状とし、且つ、この中心部を排気が通過しないように閉じている。 Also, a technique for circulating the exhaust gas only on the outer peripheral side of the disperser is known (for example, see Patent Document 2). In this technique, the central portion of the disperser has a convex shape facing the downstream side in the flow direction of the exhaust gas, and the central portion is closed so that the exhaust gas does not pass through.
　また、分散器と排気管との間に空間を設ける技術が知られている（例えば、特許文献３参照。）。 Also, a technique for providing a space between the disperser and the exhaust pipe is known (for example, see Patent Document 3).
　ところで、分散器により排気の流れ方向が変わると、排気中の還元剤が排気通路の壁面に向かう虞がある。たとえば、分散器により排気が旋回すると、排気中の尿素水が遠心力により排気管の壁面付近に偏ることがある。そして、尿素水が排気管の壁面に付着すると、排気管の壁面に尿素由来の析出物が堆積する虞がある。また、排気管の壁面に付着した分だけ選択還元型ＮＯx触媒へ到達する尿素水が減少するため、選択還元型ＮＯx触媒において尿素水の不足によりＮＯxの浄化率が低下する虞がある。 By the way, if the flow direction of the exhaust gas is changed by the disperser, the reducing agent in the exhaust gas may be directed to the wall surface of the exhaust passage. For example, when the exhaust gas is swirled by the disperser, urea water in the exhaust gas may be biased near the wall surface of the exhaust pipe due to centrifugal force. And when urea water adheres to the wall surface of an exhaust pipe, there exists a possibility that the deposit derived from urea may accumulate on the wall surface of an exhaust pipe. Further, since the urea water reaching the selective reduction type NOx catalyst is reduced by the amount adhering to the wall surface of the exhaust pipe, there is a possibility that the NOx purification rate is lowered due to the lack of urea water in the selective reduction type NOx catalyst.
特開２００８－２７４９４１号公報JP 2008-274951 A 特開２００８－１４４６４４号公報JP 2008-144644 A 特開２００８－２８０９９９号公報JP 2008-280999 A
　本発明は、内燃機関からの排気中に供給される添加剤の偏りを抑制して、添加剤をより均一に分散させることを目的とする。 An object of the present invention is to suppress the bias of the additive supplied into the exhaust gas from the internal combustion engine and to disperse the additive more uniformly.
　上記課題を達成するために本発明による内燃機関の排気浄化装置は、
　内燃機関の排気通路に設けられる排気浄化触媒と、
　前記排気浄化触媒よりも上流の排気通路に設けられ、前記排気浄化触媒へ添加剤を供給する供給部と、
　前記排気浄化触媒と前記供給部との間に設けられ、前記添加剤を分散させる分散部と、
　を備える内燃機関の排気浄化装置において、
　前記分散部は、第一ガス流形成部と、第二ガス流形成部と、を備え、
　前記第一ガス流形成部及び前記第二ガス流形成部は、該第一ガス流形成部を通過した第一のガス流と、該第二ガス流形成部を通過した第二のガス流と、が互いに干渉しあうように形成される。 In order to achieve the above object, an exhaust gas purification apparatus for an internal combustion engine according to the present invention comprises:
An exhaust purification catalyst provided in the exhaust passage of the internal combustion engine;
A supply unit that is provided in an exhaust passage upstream of the exhaust purification catalyst and supplies an additive to the exhaust purification catalyst;
A dispersion part that is provided between the exhaust purification catalyst and the supply part and disperses the additive;
An exhaust gas purification apparatus for an internal combustion engine comprising:
The dispersion unit includes a first gas flow forming unit and a second gas flow forming unit,
The first gas flow forming unit and the second gas flow forming unit are a first gas flow that has passed through the first gas flow forming unit, and a second gas flow that has passed through the second gas flow forming unit, Are formed to interfere with each other.
　ここで、供給部より添加剤が供給されると、添加剤は分散部に流入する。分散部では、たとえば排気の流れ方向を変えたり、排気の乱れを強くしたりしてもよい。そして、第一ガス流形成部を通過した第一のガス流と、第二ガス流形成部を通過した第二のガス流と、が分散部よりも下流側で互いに干渉しあう。このように両ガス流が干渉しあうことにより、第一のガス流または第二のガス流が夫々単独で流れていると仮定した場合と比べて、添加剤の偏りが小さくなる。これにより、添加剤が排気通路の壁面付近に偏ることを抑制できる。 Here, when the additive is supplied from the supply unit, the additive flows into the dispersion unit. In the dispersion unit, for example, the flow direction of the exhaust gas may be changed, or the turbulence of the exhaust gas may be increased. Then, the first gas flow that has passed through the first gas flow forming portion and the second gas flow that has passed through the second gas flow forming portion interfere with each other on the downstream side of the dispersion portion. Thus, the two gas flows interfere with each other, and the bias of the additive is reduced as compared with the case where it is assumed that the first gas flow or the second gas flow flows independently. Thereby, it can suppress that an additive is biased to the wall surface vicinity of an exhaust passage.
　また、本発明においては、前記第一ガス流形成部は、前記分散部の中心部に設けられ、前記第二ガス流形成部は、該中心部よりも外側に該第一ガス流形成部とは独立して設けられていてもよい。 Further, in the present invention, the first gas flow forming portion is provided at a central portion of the dispersion portion, and the second gas flow forming portion is disposed outside the central portion with the first gas flow forming portion. May be provided independently.
　添加剤は、第一ガス流形成部のみを通過するように供給してもよいし、第一ガス流形成部及び第二ガス流形成部を通過するように供給してもよい。すなわち、少なくとも第一のガス流に添加剤が含まれるように、添加剤を供給してもよい。第一ガス流形成部は、排気通路の中心軸側に設けられており、第二ガス流形成部は、第一ガス流形成部よりも排気通路の壁面側に設けられている。第二ガス流形成部は、第一ガス流形成部と排気通路の壁面との間の空間としてもよい。分散部では、排気の流れ方向を変えることにより、たとえば排気通路の中心軸を中心として旋回する旋回流を発生させる。この旋回流は、第一ガス流形成部でのみ発生させてもよい。また、分散部において排気の流れ方向を変えることで、排気の乱れを強くしてもよい。 The additive may be supplied so as to pass only through the first gas flow forming part, or may be supplied so as to pass through the first gas flow forming part and the second gas flow forming part. That is, the additive may be supplied so that the additive is included in at least the first gas stream. The first gas flow forming portion is provided on the central axis side of the exhaust passage, and the second gas flow forming portion is provided on the wall surface side of the exhaust passage from the first gas flow forming portion. The second gas flow forming part may be a space between the first gas flow forming part and the wall surface of the exhaust passage. In the dispersion part, by changing the flow direction of the exhaust gas, for example, a swirl flow swirling around the central axis of the exhaust passage is generated. This swirling flow may be generated only in the first gas flow forming section. Further, the turbulence of the exhaust gas may be strengthened by changing the flow direction of the exhaust gas in the dispersion portion.
　そして、第一ガス流形成部の外側に第二ガス流形成部を設けることにより、第一のガス流の周りに第二のガス流が形成される。さらに、第一ガス流形成部を通過した第一のガス流と、第二ガス流形成部を通過した第二のガス流と、が互いに干渉しあうことにより、第二のガス流が第一のガス流を中心軸側に押し戻す。このため、第一のガス流が排気通路の壁面に向かうことを抑制できるため、添加剤が排気通路の壁面付近に偏ることを抑制できる。 Then, by providing the second gas flow forming portion outside the first gas flow forming portion, a second gas flow is formed around the first gas flow. Furthermore, the first gas flow that has passed through the first gas flow forming portion and the second gas flow that has passed through the second gas flow forming portion interfere with each other, so that the second gas flow becomes the first. Push the gas flow back to the center axis. For this reason, since it can suppress that a 1st gas flow goes to the wall surface of an exhaust passage, it can suppress that an additive biases near the wall surface of an exhaust passage.
　本発明においては、前記第一ガス流形成部に形成される排気の通路の断面積が、前記第二ガス流形成部に形成される排気の通路の断面積よりも大きくてもよい。 In the present invention, the cross-sectional area of the exhaust passage formed in the first gas flow forming portion may be larger than the cross-sectional area of the exhaust passage formed in the second gas flow forming portion.
　そうすると、第二ガス流形成部よりも第一ガス流形成部のほうが排気の抵抗が大きくなる。このため、第二のガス流の速度が、第一のガス流の速度よりも速くなる。これにより、第一のガス流は、第二のガス流によって、排気通路の壁面側から排気通路の中心軸側に押し戻されるので、第一のガス流が排気通路の壁面に向かうことをより抑制することができる。これにより、添加剤が排気通路の壁面付近に偏ることをより抑制できる。 Then, the resistance of the exhaust gas becomes larger in the first gas flow forming portion than in the second gas flow forming portion. For this reason, the speed of the second gas flow is higher than the speed of the first gas flow. As a result, the first gas flow is pushed back from the wall surface side of the exhaust passage to the central axis side of the exhaust passage by the second gas flow, so that the first gas flow is further prevented from moving toward the wall surface of the exhaust passage. can do. Thereby, it can suppress more that an additive is biased to the wall surface vicinity of an exhaust passage.
　本発明においては、前記第二ガス流形成部は、該第二ガス流形成部を通過する排気の流れ方向が、前記排気通路の中心軸側に向かう方向となるか、又は排気通路の壁面と平行となるように形成されてもよい。 In the present invention, the second gas flow forming portion has a flow direction of the exhaust gas passing through the second gas flow forming portion in a direction toward the central axis of the exhaust passage, or a wall surface of the exhaust passage. You may form so that it may become parallel.
　すなわち、第二のガス流が排気通路の壁面に向かわないようにすることで、第二のガス流により第一のガス流を排気通路の中心軸方向に押し戻すことができる。このため、第一のガス流が排気通路の壁面に向かうことを抑制できる。これにより、添加剤が排気通路の壁面付近に偏ることをより抑制できる。 That is, by preventing the second gas flow from moving toward the wall surface of the exhaust passage, the first gas flow can be pushed back toward the central axis of the exhaust passage by the second gas flow. For this reason, it can suppress that a 1st gas flow goes to the wall surface of an exhaust passage. Thereby, it can suppress more that an additive is biased to the wall surface vicinity of an exhaust passage.
　本発明によれば、内燃機関からの排気中に供給される添加剤の偏りを抑制して、添加剤をより均一に分散させることができる。 According to the present invention, it is possible to more uniformly disperse the additive while suppressing the bias of the additive supplied into the exhaust gas from the internal combustion engine.
実施例に係る内燃機関の排気浄化装置の概略構成を示す図である。It is a figure which shows schematic structure of the exhaust gas purification apparatus of the internal combustion engine which concerns on an Example. 分散器を排気の流れ方向の上流側から見た図である。It is the figure which looked at the disperser from the upstream of the flow direction of exhaust gas. 分散器を排気の流れ方向と平行に切断したときの断面図である。It is sectional drawing when a disperser is cut | disconnected in parallel with the flow direction of exhaust_gas | exhaustion.
　以下、本発明に係る内燃機関の排気浄化装置の具体的な実施態様について図面に基づいて説明する。 Hereinafter, specific embodiments of the exhaust gas purification apparatus for an internal combustion engine according to the present invention will be described with reference to the drawings.
　＜実施例１＞
　図１は、本実施例に係る内燃機関の排気浄化装置の概略構成を示す図である。図１に示す内燃機関１は、ディーゼル機関であっても、また、ガソリン機関であってもよい。 <Example 1>
FIG. 1 is a diagram showing a schematic configuration of an exhaust gas purification apparatus for an internal combustion engine according to the present embodiment. The internal combustion engine 1 shown in FIG. 1 may be a diesel engine or a gasoline engine.
　内燃機関１には、排気通路２が接続されている。排気通路２の途中には、排気浄化触媒３（以下、単に「触媒３」という。）が設けられている。触媒３は、添加剤を供給することにより、温度が上昇したり、排気を浄化したり、または浄化能力が回復したりする触媒である。触媒３には、吸蔵還元型ＮＯx触媒、選択還元型ＮＯx触媒、三元触媒、酸化触媒、加水分解触媒などを例示できる。また、触媒３は、酸化機能を有する触媒としてもよい。さらに、粒子状物質を捕集するパティキュレートフィルタを備え、該パティキュレートフィルタを触媒３の担体としてもよい。また、パティキュレートフィルタよりも上流に触媒３を配置してもよい。 The exhaust passage 2 is connected to the internal combustion engine 1. An exhaust purification catalyst 3 (hereinafter simply referred to as “catalyst 3”) is provided in the middle of the exhaust passage 2. The catalyst 3 is a catalyst whose temperature rises, exhaust gas is purified, or purification ability is restored by supplying an additive. Examples of the catalyst 3 include an occlusion reduction type NOx catalyst, a selective reduction type NOx catalyst, a three-way catalyst, an oxidation catalyst, and a hydrolysis catalyst. Further, the catalyst 3 may be a catalyst having an oxidation function. Further, a particulate filter that collects particulate matter may be provided, and the particulate filter may be used as the carrier of the catalyst 3. Moreover, you may arrange | position the catalyst 3 upstream from a particulate filter.
　触媒３よりも上流側の排気通路２には、排気中へ添加剤を噴射する噴射弁４が設けられている。添加剤は、たとえば還元剤または酸化剤とすることができる。添加剤には、例えば、燃料または尿素水、アンモニアを用いることができる。添加剤に何を用いるのかは、触媒３の種類に応じて決まる。なお、本実施例においては噴射弁４が、本発明における供給部に相当する。 In the exhaust passage 2 upstream of the catalyst 3, an injection valve 4 for injecting the additive into the exhaust is provided. The additive can be, for example, a reducing agent or an oxidizing agent. For example, fuel, urea water, or ammonia can be used as the additive. What is used as the additive depends on the type of the catalyst 3. In this embodiment, the injection valve 4 corresponds to the supply unit in the present invention.
　そして、噴射弁４よりも下流で且つ触媒３よりも上流の排気通路には、添加剤を排気中に分散させる分散器５が設けられている。なお、本実施例においては分散器５が、本発明における分散部に相当する。 In the exhaust passage downstream of the injection valve 4 and upstream of the catalyst 3, a disperser 5 for dispersing the additive in the exhaust gas is provided. In this embodiment, the disperser 5 corresponds to the disperser in the present invention.
　ここで、図２は、分散器５を排気の流れ方向の上流側から見た図である。また、図３は、分散器５を排気の流れ方向と平行に切断したときの断面図である。 Here, FIG. 2 is a view of the disperser 5 viewed from the upstream side in the exhaust flow direction. FIG. 3 is a cross-sectional view of the disperser 5 cut in parallel with the exhaust flow direction.
　分散器５は、排気通路２の内径よりも小さな外径となるように、且つ、排気通路２の中心軸と同軸で中空の円筒形状となるように形成される筒部５１を備えている。この筒部５１の内周面から中心軸側に向かって同形状の複数の板５２が延びている。この複数の板５２は、筒部５１の中心軸を中心として等角度に放射状に配置される。筒部５１の内周面から板５２の先端に至る各板５２の中心軸は、筒部５１の中心軸方向と直交する。筒部５１の内周面から板５２の先端までの長さは筒部５１の半径よりも小さく、夫々の板５２が互いに接しないように設けられている。また、夫々の板５２は、筒部５１の中心軸に対して所定の角度で傾斜している。そして、板５２と板５２との間には、排気が流通することができるように隙間が設けられている。このように板５２を配置することで、排気が筒部５１の中心軸を中心として旋回する。 The disperser 5 includes a cylindrical portion 51 that has an outer diameter smaller than the inner diameter of the exhaust passage 2 and is formed in a hollow cylindrical shape coaxial with the central axis of the exhaust passage 2. A plurality of plates 52 having the same shape extend from the inner peripheral surface of the cylindrical portion 51 toward the central axis. The plurality of plates 52 are arranged radially at equal angles around the central axis of the cylindrical portion 51. The central axis of each plate 52 extending from the inner peripheral surface of the cylindrical portion 51 to the tip of the plate 52 is orthogonal to the central axis direction of the cylindrical portion 51. The length from the inner peripheral surface of the cylinder part 51 to the tip of the plate 52 is smaller than the radius of the cylinder part 51, and the plates 52 are provided so as not to contact each other. Each plate 52 is inclined at a predetermined angle with respect to the central axis of the cylindrical portion 51. A gap is provided between the plate 52 and the plate 52 so that the exhaust can circulate. By arranging the plate 52 in this way, the exhaust gas turns around the central axis of the cylindrical portion 51.
　なお、板５２の形状や数、角度などは、実験等により求めてもよい。また、板５２の代わりに、排気に乱れを大きくするか、または排気を旋回させる他の部材を備えていてもよい。たとえば、筒部５１よりも中心軸側に一枚の板を設けても良い。この板に、複数の孔を設けてもよい。 In addition, you may obtain | require the shape of the board 52, a number, an angle, etc. by experiment. Further, instead of the plate 52, the exhaust may be more disturbed, or another member for turning the exhaust may be provided. For example, a single plate may be provided closer to the central axis than the cylinder portion 51. A plurality of holes may be provided in this plate.
　また、筒部５１よりも外側には、該筒部５１の外壁と排気通路２の内壁とを接続して、該筒部５１を排気通路２内に固定させる固定部５３が複数設けられている。そして、筒部５１と排気通路２との間には排気が流通可能な空間が設けられる。 A plurality of fixing portions 53 are provided outside the tube portion 51 to connect the outer wall of the tube portion 51 and the inner wall of the exhaust passage 2 to fix the tube portion 51 in the exhaust passage 2. . A space in which exhaust gas can flow is provided between the cylinder portion 51 and the exhaust passage 2.
　このように構成された分散器５では、筒部５１よりも内側及び筒部５１よりも外側に夫々排気が流通する。なお、本実施例では、筒部５１よりも内側を第一ガス流形成部５４と称し、筒部５１よりも外側を第二ガス流形成部５５と称する。また、第一ガス流形成部５４を通過するガス流を、第一ガス流と称し、第二ガス流形成部５５を通過するガス流を、第二ガス流と称する。 In the disperser 5 configured as described above, the exhaust gas circulates inside the cylinder part 51 and outside the cylinder part 51, respectively. In the present embodiment, the inner side of the cylindrical part 51 is referred to as a first gas flow forming part 54, and the outer side of the cylindrical part 51 is referred to as a second gas flow forming part 55. The gas flow passing through the first gas flow forming unit 54 is referred to as a first gas flow, and the gas flow passing through the second gas flow forming unit 55 is referred to as a second gas flow.
　そして、排気が第一ガス流形成部５４を通過するときに、複数の板５２によって排気の流れる方向が変わり、排気は排気通路２の中心軸を中心として旋回する。そうすると、第一ガス流形成部５４に向かって添加剤を供給したときに、添加剤及び排気が旋回することにより、第一ガス流中に添加剤が分散する。ここで、仮に第二ガス流がないと仮定した場合には、第一ガス流中の添加剤が遠心力により排気通路２の壁面側に偏る虞がある。 Then, when the exhaust gas passes through the first gas flow forming portion 54, the flow direction of the exhaust gas is changed by the plurality of plates 52, and the exhaust gas turns around the central axis of the exhaust passage 2. If it does so, when an additive is supplied toward the 1st gas flow formation part 54, an additive will disperse | distribute in a 1st gas flow by an additive and exhaust gas turning. Here, if it is assumed that there is no second gas flow, the additive in the first gas flow may be biased toward the wall surface of the exhaust passage 2 due to centrifugal force.
　これに対し、第一ガス流形成部５４において形成される排気の通路の断面積が、第二ガス流形成部５５において形成される排気の通路の断面積よりも大きくなるように、第一ガス流形成部５４及び第二ガス流形成部５５を形成している。そうすると、第二ガス流形成部５５よりも第一ガス流形成部５４のほうが排気の抵抗が大きくなる。すなわち、第一ガス流形成部５４を排気が通過するときの抵抗が、第二ガス流形成部５５を排気が通過するときの抵抗よりも大きくなるように、第一ガス流形成部５４及び第二ガス流形成部５５を形成している。このため、第二ガス流の速度が、第一ガス流の速度よりも速くなる。これにより、第一ガス流は、第二ガス流によって、排気通路２の壁面側から排気通路２の中心軸側に押し戻される。したがって、添加剤が排気通路２の壁面側に偏ることを抑制できる。なお、第一ガス流形成部５４及び第二ガス流形成部５５の最適な形状は、実験等により求めることができる。 On the other hand, the first gas is formed so that the cross-sectional area of the exhaust passage formed in the first gas flow forming portion 54 is larger than the cross-sectional area of the exhaust passage formed in the second gas flow forming portion 55. A flow forming portion 54 and a second gas flow forming portion 55 are formed. As a result, the resistance of the exhaust gas is higher in the first gas flow forming portion 54 than in the second gas flow forming portion 55. That is, the first gas flow forming unit 54 and the first gas flow forming unit 54 are configured such that the resistance when the exhaust gas passes through the first gas flow forming unit 54 is larger than the resistance when the exhaust gas passes through the second gas flow forming unit 55. A two-gas flow forming portion 55 is formed. For this reason, the speed of the second gas flow is higher than the speed of the first gas flow. Thereby, the first gas flow is pushed back from the wall surface side of the exhaust passage 2 to the central axis side of the exhaust passage 2 by the second gas flow. Therefore, it is possible to suppress the additive from being biased toward the wall surface side of the exhaust passage 2. Note that the optimum shapes of the first gas flow forming portion 54 and the second gas flow forming portion 55 can be obtained by experiments or the like.
　また、第二ガス流形成部５５は、該第二ガス流形成部５５を通過する排気の流れ方向が、排気通路２の壁面から離れるか又は平行となるように形成されている。すなわち、第二ガス流が排気通路２の壁面に向かわないようにしている。たとえば、第一ガス流形成部５４を排気が通過するときの抵抗が、第二ガス流形成部５５を排気が通過するときの抵抗よりも大きくなるようにすることで、第二ガス流は排気通路２の中心軸方向に進むようになる。これにより、第一ガス流が排気通路２の壁面に向かうことを抑制できる。 Further, the second gas flow forming portion 55 is formed so that the flow direction of the exhaust gas passing through the second gas flow forming portion 55 is away from or parallel to the wall surface of the exhaust passage 2. That is, the second gas flow is prevented from moving toward the wall surface of the exhaust passage 2. For example, the resistance when the exhaust gas passes through the first gas flow forming portion 54 is larger than the resistance when the exhaust gas passes through the second gas flow forming portion 55, so that the second gas flow is exhausted. It proceeds in the direction of the central axis of the passage 2. Thereby, it can suppress that a 1st gas flow goes to the wall surface of the exhaust passage 2. FIG.
　このように、第一ガス流と第二ガス流とが分散器５よりも下流側で互いに干渉することで、添加剤が排気通路２の壁面付近に偏ることを抑制できる。また、添加剤の分散を短距離で行うことができるため、分散器５と触媒３との距離を近付けることができる。したがって、従来よりも分散器５の設置が容易になる。また、添加剤が排気通路２の壁面付近に偏ることを抑制できるため、触媒３の中心軸付近にも適切な量の添加剤を供給することができる。これにより、排気の浄化性能を向上させることができる。 Thus, the first gas flow and the second gas flow interfere with each other on the downstream side of the disperser 5 so that the additive can be prevented from being biased to the vicinity of the wall surface of the exhaust passage 2. Further, since the additive can be dispersed at a short distance, the distance between the disperser 5 and the catalyst 3 can be reduced. Therefore, it is easier to install the disperser 5 than in the prior art. Further, since the additive can be prevented from being biased to the vicinity of the wall surface of the exhaust passage 2, an appropriate amount of the additive can be supplied also to the vicinity of the central axis of the catalyst 3. Thereby, the purification performance of exhaust gas can be improved.
１     内燃機関
２     排気通路
３     排気浄化触媒
４     噴射弁
５     分散器
５１   筒部
５２   板
５３   固定部
５４   第一ガス流形成部
５５   第二ガス流形成部 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Exhaust passage 3 Exhaust purification catalyst 4 Injection valve 5 Dispersor 51 Cylindrical part 52 Plate 53 Fixing part 54 First gas flow formation part 55 Second gas flow formation part

Claims (4)

  1. 　内燃機関の排気通路に設けられる排気浄化触媒と、
    　前記排気浄化触媒よりも上流の排気通路に設けられ、前記排気浄化触媒へ添加剤を供給する供給部と、
    　前記排気浄化触媒と前記供給部との間に設けられ、前記添加剤を分散させる分散部と、
    　を備える内燃機関の排気浄化装置において、
    　前記分散部は、第一ガス流形成部と、第二ガス流形成部と、を備え、
    　前記第一ガス流形成部及び前記第二ガス流形成部は、該第一ガス流形成部を通過した第一のガス流と、該第二ガス流形成部を通過した第二のガス流と、が互いに干渉しあうように形成される内燃機関の排気浄化装置。     An exhaust purification catalyst provided in the exhaust passage of the internal combustion engine;
    A supply unit that is provided in an exhaust passage upstream of the exhaust purification catalyst and supplies an additive to the exhaust purification catalyst;
    A dispersion part that is provided between the exhaust purification catalyst and the supply part and disperses the additive;
    An exhaust gas purification apparatus for an internal combustion engine comprising:
    The dispersion unit includes a first gas flow forming unit and a second gas flow forming unit,
    The first gas flow forming unit and the second gas flow forming unit are a first gas flow that has passed through the first gas flow forming unit, and a second gas flow that has passed through the second gas flow forming unit, , An exhaust purification device for an internal combustion engine formed so as to interfere with each other.
  2. 　前記第一ガス流形成部は、前記分散部の中心部に設けられ、前記第二ガス流形成部は、該中心部よりも外側に該第一ガス流形成部とは独立して設けられる請求項１に記載の内燃機関の排気浄化装置。 The first gas flow forming portion is provided at a central portion of the dispersing portion, and the second gas flow forming portion is provided outside the central portion and independently of the first gas flow forming portion. Item 6. An exhaust emission control device for an internal combustion engine according to Item 1.
  3. 　前記第一ガス流形成部に形成される排気の通路の断面積が、前記第二ガス流形成部に形成される排気の通路の断面積よりも大きい請求項１または２に記載の内燃機関の排気浄化装置。 The internal combustion engine according to claim 1 or 2, wherein a cross-sectional area of an exhaust passage formed in the first gas flow forming portion is larger than a cross-sectional area of an exhaust passage formed in the second gas flow forming portion. Exhaust purification device.
  4. 　前記第二ガス流形成部は、該第二ガス流形成部を通過する排気の流れ方向が、前記排気通路の中心軸側に向かう方向となるか、又は排気通路の壁面と平行となるように形成される請求項１から３の何れか１項に記載の内燃機関の排気浄化装置。 The second gas flow forming section is configured such that the flow direction of the exhaust gas passing through the second gas flow forming section is a direction toward the central axis of the exhaust passage or parallel to the wall surface of the exhaust passage. The exhaust emission control device for an internal combustion engine according to any one of claims 1 to 3, which is formed.
PCT/JP2011/062704 2011-06-02 2011-06-02 Exhaust purification device for internal combustion engine WO2012164722A1 (en)

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PCT/JP2011/062704 WO2012164722A1 (en) 2011-06-02 2011-06-02 Exhaust purification device for internal combustion engine
JP2013517777A JPWO2012164722A1 (en) 2011-06-02 2011-06-02 Exhaust gas purification device for internal combustion engine
EP11866883.9A EP2716884A4 (en) 2011-06-02 2011-06-02 Exhaust purification device for internal combustion engine

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EP2716884A1 (en) 2014-04-09
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