JP2009114910A - Exhaust gas cleaning apparatus - Google Patents

Exhaust gas cleaning apparatus Download PDF

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JP2009114910A
JP2009114910A JP2007287269A JP2007287269A JP2009114910A JP 2009114910 A JP2009114910 A JP 2009114910A JP 2007287269 A JP2007287269 A JP 2007287269A JP 2007287269 A JP2007287269 A JP 2007287269A JP 2009114910 A JP2009114910 A JP 2009114910A
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exhaust
exhaust gas
selective reduction
reduction catalyst
bent portion
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JP4605205B2 (en
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Ataru Ichikawa
中 市川
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Denso Corp
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Denso Corp
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Priority to JP2007287269A priority Critical patent/JP4605205B2/en
Priority to DE102008042678A priority patent/DE102008042678A1/en
Priority to US12/248,376 priority patent/US20090092525A1/en
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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
    • F01N3/10—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]
    • 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
    • F01N13/009—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 separate purifying devices arranged in series
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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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)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas cleaning apparatus properly injecting/supplying an additive used for cleaning the exhaust gas of an internal combustion engine. <P>SOLUTION: In a urea SCR device 10, a DPF 20, a bent tube 11, a bent tube 12, and an SCR catalyst 30 are arranged in this order from an exhaust gas upstream side. An exhaust gas passage is formed within a DPF case 21, the bent tube 11, the bent tube 12, and a catalyst case 31. An injection valve 40 is provided on the outside of the bend of the bent tube 12, and injects a urea solution in a direction that deviates from a tangent line, which is tangent to a central axis line on an exhaust gas downstream side of the bent tube 12, toward the inside of the bend of bent tube 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、選択還元触媒方式の排気浄化装置に関する。   The present invention relates to a selective reduction catalyst type exhaust purification device.

近年、車載内燃機関（特にディーゼルエンジン）等に適用されて、排気中のＮＯｘ（窒素酸化物）を高い浄化率で浄化する排気浄化装置として、尿素ＳＣＲ装置の開発が進められており、一部実用化に至っている（例えば特許文献１）。   In recent years, urea SCR devices have been developed as exhaust gas purification devices that are applied to in-vehicle internal combustion engines (particularly diesel engines) and the like and purify NOx (nitrogen oxides) in exhaust gas at a high purification rate. It has come to practical use (for example, Patent Document 1).

特許文献１に記載された尿素ＳＣＲ装置は、排気浄化反応を促進する選択還元触媒と、エンジンから排出される排気を選択還元触媒へ導く排気通路と、その排気通路内に尿素水溶液を噴射させるノズルとを備えている。そしてノズルは、排気通路の一部を形成する曲がり管の曲げ外側に設けられ、その曲がり管の排気下流側端に接続された直管の中心軸線上に尿素水溶液を噴射するようになっている。
特開２００３−２９３７３９号公報 The urea SCR device described in Patent Document 1 includes a selective reduction catalyst that promotes an exhaust purification reaction, an exhaust passage that guides exhaust discharged from an engine to the selective reduction catalyst, and a nozzle that injects an aqueous urea solution into the exhaust passage. And. The nozzle is provided outside the bent pipe that forms a part of the exhaust passage, and injects the urea aqueous solution onto the central axis of the straight pipe connected to the exhaust downstream end of the bent pipe. .
JP 2003-293739 A

しかしながら、特許文献１に記載された尿素ＳＣＲ装置では、ノズルから噴射された尿素水溶液の噴霧が排気流によって曲がり管の曲げ外側に流され、尿素水溶液の噴霧が曲がり管の内壁や直管の内壁に付着し、さらに付着した尿素水溶液が尿素として内壁に析出するおそれがある。このように排気管の内壁に付着した尿素水溶液はＮＯｘとの排気浄化反応に供されず、結果として尿素水溶液が浪費される。また、尿素の排気管の内壁への析出の結果、排気の流路面積が減少し、ひいては排気管の管内の排気圧が上昇することが考えられる。   However, in the urea SCR device described in Patent Document 1, the spray of the urea aqueous solution injected from the nozzle is caused to flow outside the bent pipe by the exhaust flow, and the spray of the urea aqueous solution is the inner wall of the bent pipe or the inner wall of the straight pipe. There is a possibility that the urea aqueous solution that adheres to the inner wall will precipitate as urea on the inner wall. Thus, the urea aqueous solution adhering to the inner wall of the exhaust pipe is not subjected to the exhaust purification reaction with NOx, and as a result, the urea aqueous solution is wasted. Further, as a result of the precipitation of urea on the inner wall of the exhaust pipe, it is conceivable that the flow area of the exhaust gas is reduced, and consequently the exhaust pressure in the exhaust pipe is increased.

本発明は上述の問題を解決するためになされたものであって、内燃機関の排気の浄化に供される還元剤を好適に噴射供給する排気浄化装置を提供することを主たる目的とするものである。   The present invention has been made in order to solve the above-mentioned problems, and has as its main object to provide an exhaust purification device that suitably injects and supplies a reducing agent used for purification of exhaust gas from an internal combustion engine. is there.

以下、上記課題を解決するための手段、及びその作用効果について説明する。   Hereinafter, means for solving the above-described problems and the effects thereof will be described.

本発明は、内燃機関の排気を流す排気通路と、内燃機関の排気に含まれる特定成分の還元反応を促進する選択還元触媒と、還元反応に供される還元剤を選択還元触媒に対して噴射供給する噴射装置とを備え、内燃機関の排気を還元反応によって浄化する排気浄化装置である。また、排気通路が選択還元触媒よりも排気上流側に曲部を有しており、その曲部の曲げ外側に噴射装置が設けられている。   The present invention relates to an exhaust passage through which exhaust gas from an internal combustion engine flows, a selective reduction catalyst that promotes a reduction reaction of a specific component contained in the exhaust of the internal combustion engine, and a reducing agent that is used in the reduction reaction is injected into the selective reduction catalyst. An exhaust gas purification device that purifies exhaust gas from an internal combustion engine by a reduction reaction. Further, the exhaust passage has a curved portion on the exhaust upstream side of the selective reduction catalyst, and an injection device is provided outside the curved portion.

このような排気浄化装置では、噴射装置から噴射された還元剤の噴霧（以下「還元剤噴霧」という）が排気流によって曲部の曲げ外側に流され、還元剤噴霧が曲部の内壁やその下流側の内壁に付着するおそれがある。   In such an exhaust purification device, the spray of reducing agent (hereinafter referred to as “reducing agent spray”) injected from the injection device is caused to flow outside the bent portion of the bent portion by the exhaust flow, and the reducing agent spray is applied to the inner wall of the bent portion or the inner wall of the bent portion. There is a risk of adhering to the downstream inner wall.

この点、請求項１に記載の発明では、曲部の排気下流側の中心軸線に対する接線よりも曲部の曲げ内側に向けて噴射装置から還元剤を噴射するようになっている。また、請求項２に記載の発明では、曲部の排気下流側の中心軸線に対する接線を基準に曲部の曲げ内側にオフセットさせて噴射装置から還元剤を噴射するようになっている。また、請求項３に記載の発明では、曲部の排気下流側の中心軸線に対する接線よりも曲部の曲げ内側に向けて、かつ上記接線を基準に曲部の曲げ内側にオフセットさせて噴射装置から還元剤を噴射するようになっている。このように、還元剤噴霧を曲部の曲げ内側に噴射供給することにより、還元剤噴霧の曲部の内壁への付着を抑制し、還元剤の浪費を抑制することができる。   In this regard, in the first aspect of the present invention, the reducing agent is injected from the injection device toward the bending inner side of the curved portion rather than the tangent to the central axis of the curved portion on the exhaust downstream side. In the second aspect of the invention, the reducing agent is injected from the injection device while being offset to the bending inner side of the curved portion with respect to the tangent to the central axis on the exhaust downstream side of the curved portion. Further, in the invention according to claim 3, the injection device is configured to be offset toward the bending inner side of the curved portion from the tangent to the central axis of the curved portion on the exhaust downstream side, and offset to the bending inner side of the curved portion based on the tangent line. The reducing agent is sprayed from. In this way, by supplying the reducing agent spray to the inside of the bent portion of the bend, the adhesion of the reducing agent spray to the inner wall of the bent portion can be suppressed, and waste of the reducing agent can be suppressed.

請求項４に記載の発明では、請求項１又は３に記載の発明において、排気通路が、曲部の排気下流側端から選択還元触媒の排気上流側端まで排気を導く直管状の直部を有し、曲部の排気下流側端（曲率が０になる部分）において曲部の中心軸線に対する接線と上記直部の中心軸線とが一致するように形成されている。そして、排気通路の直部の中心軸線よりも曲部の曲げ内側に向けて噴射装置から還元剤を噴射するようになっている。これにより、還元剤噴霧の曲部の内壁への付着を抑制するとともに、還元剤噴の直部の内壁への付着を抑制することができる。   According to a fourth aspect of the present invention, in the first or third aspect of the present invention, the exhaust passage includes a straight tubular straight portion that guides exhaust gas from the exhaust downstream side end of the curved portion to the exhaust upstream side end of the selective reduction catalyst. And the tangent to the central axis of the curved portion coincides with the central axis of the straight portion at the exhaust downstream side end of the curved portion (the portion where the curvature becomes 0). Then, the reducing agent is injected from the injection device toward the bending inner side of the curved portion with respect to the central axis of the direct portion of the exhaust passage. Thereby, while adhering to the inner wall of the curved part of a reducing agent spray can be suppressed, adhesion to the inner wall of the direct part of a reducing agent jet can be suppressed.

請求項５に記載の発明では、請求項２又は３に記載の発明において、排気通路が、曲部の排気下流側端から選択還元触媒の排気上流側端まで排気を導く直管状の直部を有し、曲部の排気下流側端（曲率が０になる部分）において曲部の中心軸線に対する接線と上記直部の中心軸線とが一致するように形成されている。そして、排気通路の直部の中心軸線を基準に曲部の曲げ内側にオフセットさせて噴射装置から還元剤を噴射するようになっている。これにより、還元剤噴霧の曲部の内壁への付着を抑制するとともに、還元剤噴の直部の内壁への付着を抑制することができる。   The invention according to claim 5 is the invention according to claim 2 or 3, wherein the exhaust passage includes a straight tubular straight portion that guides the exhaust from the exhaust downstream side end of the curved portion to the exhaust upstream side end of the selective reduction catalyst. And the tangent to the central axis of the curved portion coincides with the central axis of the straight portion at the exhaust downstream side end of the curved portion (the portion where the curvature becomes 0). Then, the reducing agent is injected from the injection device while being offset to the inside of the bent portion with respect to the central axis of the direct portion of the exhaust passage. Thereby, while adhering to the inner wall of the curved part of a reducing agent spray can be suppressed, adhesion to the inner wall of the direct part of a reducing agent jet can be suppressed.

請求項６に記載の発明では、還元剤は尿素水溶液であり、選択還元触媒はアンモニア選択還元触媒である。すなわち、請求項６に記載の発明は尿素ＳＣＲ装置である。ここで、尿素水溶液の噴霧が排気通路の内壁に付着すると、尿素として排気通路の内壁に析出し、ひいては排気通路内の排気圧が上昇する。この点、請求項１から５の発明によると尿素水溶液の噴霧の排気通路の内壁への付着が抑制されるため、尿素の排気通路の内壁への析出を抑制することができる。   In the invention described in claim 6, the reducing agent is an aqueous urea solution, and the selective reduction catalyst is an ammonia selective reduction catalyst. That is, the invention described in claim 6 is a urea SCR device. Here, when the spray of the urea aqueous solution adheres to the inner wall of the exhaust passage, it is deposited as urea on the inner wall of the exhaust passage, and as a result, the exhaust pressure in the exhaust passage increases. In this respect, according to the first to fifth aspects of the present invention, the spraying of the urea aqueous solution is prevented from adhering to the inner wall of the exhaust passage, so that precipitation of urea on the inner wall of the exhaust passage can be suppressed.

以下、本発明を具体化した複数の実施形態について図面を参照しながら説明する。   Hereinafter, a plurality of embodiments embodying the present invention will be described with reference to the drawings.

（第１実施形態）
第１実施形態は、車載ディーゼルエンジン用の尿素ＳＣＲ装置として本発明を具体化しており、その詳細な構成を以下に説明する。はじめに、図１を参照しながら、本実施形態の尿素ＳＣＲ装置１０の概要を説明する。図１は、排気浄化装置としての尿素ＳＣＲ装置１０を内燃機関としてのエンジンへの取付状態で水平方向から見たものである。また、図１において、矢印Ｘ１は水平方向の１つ（Ｘ１方向）を、また矢印Ｙ１は鉛直下向き（Ｙ１方向）を示している。 (First embodiment)
The first embodiment embodies the present invention as a urea SCR device for a vehicle-mounted diesel engine, and its detailed configuration will be described below. First, an outline of the urea SCR device 10 of the present embodiment will be described with reference to FIG. FIG. 1 shows a urea SCR device 10 as an exhaust gas purification device viewed from a horizontal direction in a state of being attached to an engine as an internal combustion engine. In FIG. 1, an arrow X1 indicates one horizontal direction (X1 direction), and an arrow Y1 indicates a vertically downward direction (Y1 direction).

図１に示す尿素ＳＣＲ装置１０は、エンジンの排気系に取り付けられ、同エンジンから排出される排気を浄化するものである。詳しくは、ディーゼルエンジンの排気ポートに排気マニホールドが設けられており、尿素ＳＣＲ装置１０は上記マニホールドの最下流部に取り付けられるように構成されている。そして、尿素ＳＣＲ装置１０では、排気上流側からＤＰＦ（Diesel Particulate Filter）２０、曲がり管１１、曲がり管１２、ＳＣＲ触媒３０がこの順に配設されている。尿素ＳＣＲ装置１０では、ＤＰＦケース２１、曲がり管１１、曲がり管１２、及び触媒ケース３１の内側に排気通路が形成されており、上記排気通路を矢印Ａ１の如く流れる排気が浄化されるようになっている。なお、排気通路のうち曲がり管１２の管内に形成される部分が「曲部」に相当する。   A urea SCR device 10 shown in FIG. 1 is attached to an exhaust system of an engine and purifies exhaust exhausted from the engine. Specifically, an exhaust manifold is provided in the exhaust port of the diesel engine, and the urea SCR device 10 is configured to be attached to the most downstream portion of the manifold. In the urea SCR device 10, a DPF (Diesel Particulate Filter) 20, a bent pipe 11, a bent pipe 12, and an SCR catalyst 30 are arranged in this order from the exhaust upstream side. In the urea SCR device 10, an exhaust passage is formed inside the DPF case 21, the bent pipe 11, the bent pipe 12, and the catalyst case 31, and the exhaust gas flowing through the exhaust passage as indicated by an arrow A1 is purified. ing. In addition, the part formed in the pipe | tube of the bending pipe 12 among exhaust passages corresponds to a "curved part."

ＤＰＦ２０及びＳＣＲ触媒３０は、尿素ＳＣＲ装置１０のエンジンへの取付状態にて排気が水平方向（Ｘ１方向）に流れるように、すなわち排気の流入口及び流出口が水平方向に開口するように設けられている。ＤＰＦ２０は、尿素ＳＣＲ装置１０のエンジン取付状態においてＤＰＦ２０よりも上方に位置し、曲がり管１１及び曲がり管１２経由でＳＣＲ触媒３０に接続されている。   The DPF 20 and the SCR catalyst 30 are provided so that the exhaust flows in the horizontal direction (X1 direction) when the urea SCR device 10 is attached to the engine, that is, the exhaust inlet and outlet are opened in the horizontal direction. ing. The DPF 20 is positioned above the DPF 20 when the urea SCR device 10 is mounted on the engine, and is connected to the SCR catalyst 30 via the bent pipe 11 and the bent pipe 12.

曲がり管１１は、ＤＰＦケース２１に接続されており、尿素ＳＣＲ装置１０のエンジンへの取付状態にて排気の流向が水平方向（Ｘ１方向）から鉛直下向き（Ｙ１方向）に変化するように、すなわち排気の流入口が水平方向に開口し排気の流出口が鉛直方向に開口するように設けられている。曲がり管１２は、曲がり管１１に接続されており、尿素ＳＣＲ装置１０のエンジンの取付状態にて排気の流向が鉛直下向き（Ｙ１方向）から水平方向（Ｘ１方向）に変化するように、すなわち排気の出入口がそれぞれ鉛直方向と水平方向に開口するように設けられている。   The bent pipe 11 is connected to the DPF case 21 so that the flow direction of the exhaust gas changes from the horizontal direction (X1 direction) to the vertical downward direction (Y1 direction) when the urea SCR device 10 is attached to the engine. The exhaust inlet is provided in a horizontal direction and the exhaust outlet is provided in a vertical direction. The bent pipe 12 is connected to the bent pipe 11 so that the flow direction of the exhaust gas changes from the vertically downward direction (Y1 direction) to the horizontal direction (X1 direction) when the urea SCR device 10 is mounted on the engine, that is, the exhaust gas. Are provided so as to open in the vertical and horizontal directions, respectively.

触媒ケース３１は曲がり管１２に接続されている。触媒ケース３１のうち触媒担体３２の排気上流側端よりも上流側の部分（以下「直管部」という）３１ａは水平方向に延びている。その結果、曲がり管１２の排気下流側端では、曲がり管１２の中心軸線１４に対する接線が直管部３１ａの中心軸線３３と一致している。なお、排気通路のうち直管部３１ａの管内に形成される部分が「直部」に相当する。   The catalyst case 31 is connected to the bent pipe 12. A portion of the catalyst case 31 upstream of the exhaust upstream side end of the catalyst carrier 32 (hereinafter referred to as “straight pipe portion”) 31a extends in the horizontal direction. As a result, at the exhaust downstream side end of the bent pipe 12, the tangent to the central axis 14 of the bent pipe 12 coincides with the central axis 33 of the straight pipe portion 31a. In addition, the part formed in the pipe | tube of the straight pipe part 31a among exhaust passages corresponds to a "straight part."

上記ＤＰＦ２０は、ハニカム構造のＤＰＦ担体２２、同担体２２を収容するＤＰＦケース２１などで構成されている。このＤＰＦ２０は、排気中のＰＭ（Particulate Matter：粒子状物質）を捕集する連続再生式のＰＭ除去用フィルタである。ＤＰＦ担体２２は、図示しない白金系の酸化触媒を担持しており、ＰＭ成分の１つである可溶性有機成分（ＳＯＦ）と共に、ＨＣやＣＯを除去することができるようになっている。   The DPF 20 includes a DPF carrier 22 having a honeycomb structure, a DPF case 21 that accommodates the carrier 22, and the like. The DPF 20 is a continuous regeneration PM removal filter that collects PM (Particulate Matter) in exhaust gas. The DPF carrier 22 carries a platinum-based oxidation catalyst (not shown) and can remove HC and CO together with a soluble organic component (SOF) which is one of the PM components.

曲がり管１２の曲げ外側には突出部１３が設けられており、その突出部１３に噴射弁４０が取り付けられている。詳しくは、突出部１３は、曲がり管１２の曲げ外側において触媒ケース３１とは反対側に突出する筒状に形成されており、その中心軸線と触媒ケース３１の直管部３１ａの中心軸線３３とが一致するように曲がり管１２の管内に開口している。そして、突出部１３の触媒ケース３１とは反対側の端面１３ａの中央にて、噴射弁４０のノズル部４１に設けられた噴孔が突出部１３の管内に開口している。このように噴射弁４０のノズル部４１を曲がり管１２の管内に晒すことなく突出部１３の管内に収容することで、ノズル部４１の排気からの比熱を低減することができる。   A protruding portion 13 is provided on the outer side of the bent pipe 12, and an injection valve 40 is attached to the protruding portion 13. Specifically, the protruding portion 13 is formed in a cylindrical shape that protrudes to the opposite side of the catalyst case 31 on the outer side of the bent tube 12, and its central axis and the central axis 33 of the straight pipe portion 31 a of the catalyst case 31. Are opened in the tube of the bent tube 12 so as to match. And the nozzle hole provided in the nozzle part 41 of the injection valve 40 is opened in the pipe | tube of the protrusion part 13 in the center of the end surface 13a on the opposite side to the catalyst case 31 of the protrusion part 13. As shown in FIG. Thus, the specific heat from the exhaust of the nozzle part 41 can be reduced by accommodating the nozzle part 41 of the injection valve 40 in the pipe of the protruding part 13 without exposing it to the pipe of the bent pipe 12.

噴射装置としての噴射弁４０は、図示しない尿素水供給系により加圧供給される尿素水溶液をノズル部４１に形成された噴孔から噴射することにより、曲がり管１２の管内に尿素水溶液の噴霧を形成するものである。曲がり管１２の管内に形成された尿素水溶液の噴霧は、排気の熱によりアンモニア（ＮＨ３）に変換され（次式（１）参照）、排気共々下流のＳＣＲ触媒３０へ供給され、同触媒３０おいて排気浄化反応に供されることとなる。このように、排気通路には、尿素水溶液の噴霧に加え、アンモニアの噴霧が流れることとなるが、説明の都合上、以下、これらの噴霧を「尿素水溶液の噴霧」と記載する。
（ＮＨ2）２ＣＯ＋Ｈ2Ｏ→２ＮＨ3＋ＣＯ2 …（１）
選択還元触媒としてのＳＣＲ触媒３０は、ハニカム構造の触媒担体３２、同担体３２を収容する触媒ケース３１などで構成されている。触媒担体３２には、酸化バナジウム（Ｖ2Ｏ5）等の触媒金属が担持されており、ＳＣＲ触媒３０は、公知のＮＯｘの還元反応（排気浄化反応）を促進し、排気中のＮＯｘを還元する（次式（２）〜（４）参照）。
４ＮＯ＋４ＮＨ3＋Ｏ2→４Ｎ2＋６Ｈ2Ｏ …（２）
６ＮＯ2＋８ＮＨ3→７Ｎ2＋１２Ｈ2Ｏ …（３）
ＮＯ＋ＮＯ2＋２ＮＨ3→２Ｎ2＋３Ｈ2Ｏ …（４）
ここで、尿素ＳＣＲ装置では、排気通路の内壁への尿素水溶液の噴霧の付着を抑制すべく、尿素水溶液の噴霧を排気通路の内壁全周から均等に離間した部分に供給することが望ましい。そのため、図５に示す比較例のように、触媒ケース３１の直部３１ａの中心軸線３３上に噴射弁４０から尿素水溶液を噴射することが考えられる。ところが、排気通路のうち曲がり管１２の管内に形成された部分（曲部）では、排気の流向が触媒ケース３１の直管部３１ａの中心軸線３３と交差する。すなわち、触媒ケース３１の直管部３１ａの中心軸線３３において排気が鉛直下向き（Ｙ１方向）の速度成分を有している。これにより、噴射弁４０から噴射された尿素水溶液の噴霧が鉛直下向きに流されて、曲がり管１２の曲げ外側の内壁やその排気下流側の直管部３１ａの内壁に付着し、さらに付着した尿素水溶液が尿素として内壁に析出することが考えられる。 The injection valve 40 as an injection device sprays the urea aqueous solution into the pipe of the bent pipe 12 by injecting a urea aqueous solution pressurized and supplied by a urea water supply system (not shown) from the injection hole formed in the nozzle portion 41. To form. The urea aqueous solution spray formed in the bent pipe 12 is converted into ammonia (NH 3) by the heat of the exhaust (see the following formula (1)), and is supplied to the SCR catalyst 30 downstream of the exhaust. Therefore, it will be used for the exhaust purification reaction. Thus, in addition to the spray of urea aqueous solution, the spray of ammonia flows in the exhaust passage. For convenience of explanation, these sprays are hereinafter referred to as “spray of urea aqueous solution”.
(NH2) 2CO + H2O → 2NH3 + CO2 (1)
The SCR catalyst 30 as a selective reduction catalyst includes a catalyst support 32 having a honeycomb structure, a catalyst case 31 that accommodates the support 32, and the like. A catalytic metal such as vanadium oxide (V2O5) is supported on the catalyst carrier 32, and the SCR catalyst 30 promotes a known NOx reduction reaction (exhaust purification reaction) to reduce NOx in the exhaust (next) (Refer Formula (2)-(4)).
4NO + 4NH3 + O2 → 4N2 + 6H2O (2)
6NO2 + 8NH3 → 7N2 + 12H2O (3)
NO + NO2 + 2NH3 → 2N2 + 3H2O (4)
Here, in the urea SCR device, it is desirable to supply the spray of the urea aqueous solution to a portion evenly spaced from the entire inner wall of the exhaust passage in order to suppress the adhesion of the spray of the urea aqueous solution to the inner wall of the exhaust passage. Therefore, it is conceivable to inject the urea aqueous solution from the injection valve 40 onto the central axis 33 of the straight part 31a of the catalyst case 31 as in the comparative example shown in FIG. However, the exhaust flow direction intersects the central axis 33 of the straight pipe portion 31 a of the catalyst case 31 in a portion (curved portion) formed in the bent pipe 12 in the exhaust passage. That is, the exhaust gas has a velocity component that is vertically downward (Y1 direction) in the central axis 33 of the straight pipe portion 31a of the catalyst case 31. As a result, the spray of the urea aqueous solution injected from the injection valve 40 is caused to flow vertically downward and adheres to the inner wall of the bent pipe 12 on the outer side of the bent pipe and the inner wall of the straight pipe portion 31a on the exhaust downstream side, and further adheres urea. It is conceivable that the aqueous solution is precipitated on the inner wall as urea.

そこで、本実施形態では、図１に示すように触媒ケース３１の直管部３１ａの中心軸線３３よりも曲がり管１２の曲げ内側（上流側）に向けて、噴射弁４０から尿素水溶液を噴射するようになっている。詳しくは、ノズル４１に形成された噴孔の噴霧中心４２が上記中心軸線３３よりも曲がり管１２の曲げ内側（鉛直上向き）に傾くように、噴射弁４０が突出部１３の端面１３ａに取り付けられている。ここで、上述の如く曲がり管１２の排気下流側端では、曲がり管１２の中心軸線１４に対する接線が直管部３１ａの中心軸線３３と一致している。すなわち、本実施形態では、曲がり管１２の中心軸線１４に対する接線よりも曲がり管１２の曲げ内側（上流側）に向けて、噴射弁４０から尿素水溶液を噴射するようにもなっている。このように尿素水溶液を曲がり管１２の曲げ内側に噴射することにより、曲がり管１２及び直管部３１ａの内壁への尿素水溶液の付着及び尿素の析出を抑制することができる。   Therefore, in the present embodiment, as shown in FIG. 1, the urea aqueous solution is injected from the injection valve 40 toward the bending inner side (upstream side) of the bent pipe 12 with respect to the central axis 33 of the straight pipe portion 31 a of the catalyst case 31. It is like that. Specifically, the injection valve 40 is attached to the end surface 13a of the projecting portion 13 so that the spray center 42 of the nozzle hole formed in the nozzle 41 is inclined to the bending inner side (vertically upward) of the bending tube 12 with respect to the central axis 33. ing. Here, at the exhaust downstream side end of the bent pipe 12 as described above, the tangent to the central axis 14 of the bent pipe 12 coincides with the central axis 33 of the straight pipe portion 31a. That is, in this embodiment, the urea aqueous solution is also injected from the injection valve 40 toward the bending inner side (upstream side) of the bending pipe 12 with respect to the tangent to the central axis 14 of the bending pipe 12. By injecting the urea aqueous solution into the bent inner side of the bent tube 12 in this way, adhesion of urea aqueous solution and precipitation of urea on the inner wall of the bent tube 12 and the straight pipe portion 31a can be suppressed.

（第２実施形態）
第２実施形態は、第１実施形態と同様にして車載ディーゼルエンジンの排気を浄化する尿素ＳＣＲ装置である。以下、図２を参照しながら、本実施形態の尿素ＳＣＲ装置５０の構成及び効果をこの順に説明する。図２は、本実施形態の尿素ＳＣＲ装置５０をエンジンへの取付状態にて上方から見たものである。なお、第２実施形態の尿素ＳＣＲ装置を構成する構成要素のうち、第１実施形態の対応する構成要素と実質的に同一のものには、同一符号を付して、それらの説明を省略する。また、図２において、矢印Ｘ２は水平方向の１つ（Ｘ２方向）を、また矢印Ｙ２はＸ２方向と直交する水平方向（Ｙ２方向）示している。 (Second Embodiment)
The second embodiment is a urea SCR device that purifies exhaust from an in-vehicle diesel engine in the same manner as the first embodiment. Hereinafter, the configuration and effects of the urea SCR device 50 of the present embodiment will be described in this order with reference to FIG. FIG. 2 is a view of the urea SCR device 50 according to the present embodiment as viewed from above in a state of being attached to the engine. Note that, among the components constituting the urea SCR device of the second embodiment, the same components as the corresponding components of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. . In FIG. 2, an arrow X2 indicates one horizontal direction (X2 direction), and an arrow Y2 indicates a horizontal direction (Y2 direction) orthogonal to the X2 direction.

図２に示す尿素ＳＣＲ装置５０では、排気の上流側からＤＰＦ２０、曲がり管５１、曲がり管５２、ＳＣＲ触媒３０がこの順に配置されている。ＤＰＦ２０及びＳＣＲ触媒３０は、尿素ＳＣＲ装置５０のエンジンへの取付状態において同一水平面上に位置し、曲がり管５１及び曲がり管５２経由で互いに接続されている。この尿素ＳＣＲ装置５０では、ＤＰＦケース２１、曲がり管５１、曲がり管５２、及び触媒ケース３１の内側に排気通路が形成されており、尿素ＳＣＲ装置５０は上記排気通路を矢印Ａ２の如く流れる排気を浄化する。   In the urea SCR device 50 shown in FIG. 2, the DPF 20, the bent pipe 51, the bent pipe 52, and the SCR catalyst 30 are arranged in this order from the upstream side of the exhaust. The DPF 20 and the SCR catalyst 30 are located on the same horizontal plane when the urea SCR device 50 is attached to the engine, and are connected to each other via the bent pipe 51 and the bent pipe 52. In the urea SCR device 50, an exhaust passage is formed inside the DPF case 21, the bent pipe 51, the bent pipe 52, and the catalyst case 31, and the urea SCR device 50 discharges exhaust flowing through the exhaust passage as indicated by an arrow A2. Purify.

ＤＰＦ２０は、排気の流向がそれぞれＸ２方向となるように設けられている。またＳＣＲ触媒３０は、排気の流向がＸ２方向とは逆方向（−Ｘ２方向）となるように設けられている。そして曲がり管５１及び曲がり管５２は、それらの管内に半円環状の排気通路を形成している。詳しくは、曲がり管５１は、ＤＰＦ２０に接続され、排気の流向がＸ２方向からＹ２方向に変化するように設けられている。一方、曲がり管５２は、曲がり管５１及びＳＣＲ触媒３０に接続され、排気の流向がＹ２方向から−Ｘ２方向に変化するように設けられている。   The DPF 20 is provided such that the flow direction of the exhaust gas is in the X2 direction. The SCR catalyst 30 is provided such that the exhaust flow direction is opposite to the X2 direction (−X2 direction). The bent pipe 51 and the bent pipe 52 form a semicircular exhaust passage in the pipes. Specifically, the bent pipe 51 is connected to the DPF 20 and is provided so that the flow direction of the exhaust gas changes from the X2 direction to the Y2 direction. On the other hand, the bent pipe 52 is connected to the bent pipe 51 and the SCR catalyst 30, and is provided so that the flow direction of the exhaust gas changes from the Y2 direction to the -X2 direction.

曲がり管５１の曲げ外側には突出部５３が設けられており、その突出部５３には噴射弁４０が設けられている。詳しくは、突出部５３は、曲がり管５１の曲げ外側に曲がり管５２とは反対側に突出するように設けられている。この突出部５３は、筒状に形成されており、その中心軸線が曲がり管５１の排気下流側端の管内中央を通るように曲がり管５１の管内に開口している。そして、突出部５３の曲がり管５２とは反対側の端面５３ａの中央にて、噴射弁４０のノズル部４１に設けられた噴孔が突出部５３内に開口している。   A protruding portion 53 is provided outside the bent pipe 51, and an injection valve 40 is provided on the protruding portion 53. Specifically, the protruding portion 53 is provided on the outer side of the bent tube 51 so as to protrude to the opposite side of the bent tube 52. The protruding portion 53 is formed in a cylindrical shape, and is opened in the pipe of the bent pipe 51 so that the central axis thereof passes through the center of the bent pipe 51 at the downstream end of the exhaust pipe. An injection hole provided in the nozzle portion 41 of the injection valve 40 opens into the protrusion 53 at the center of the end surface 53 a opposite to the bent pipe 52 of the protrusion 53.

本実施形態では、曲がり管５１，５２の中心軸線５４に対する接線５５よりも曲がり管５１，５２の曲げ内側（排気上流側）に向けて、噴射弁４０から尿素水溶液を噴射するようになっている。詳しくは、ノズル４１に形成された噴孔の噴霧中心５６が上記接線５５よりも曲がり管５１，５２の曲げ内側（鉛直方向に対して曲がり管５１，５２の曲げ内側）に傾くように、噴射弁４０が突出部５３の端面５３ａに取り付けられている。   In the present embodiment, the urea aqueous solution is injected from the injection valve 40 toward the bent inner side (exhaust upstream side) of the bent pipes 51 and 52 from the tangent line 55 to the central axis 54 of the bent pipes 51 and 52. . Specifically, the injection is performed so that the spray center 56 of the nozzle hole formed in the nozzle 41 is inclined to the bending inner side of the bending pipes 51 and 52 (the bending inner side of the bending pipes 51 and 52 with respect to the vertical direction) with respect to the tangent line 55. The valve 40 is attached to the end surface 53 a of the protruding portion 53.

このように尿素水溶液を曲がり管５１，５２の曲げ内側に噴射することにより、曲がり管５１，５２の内壁への尿素水溶液の付着及び尿素の析出を抑制することができる。   By injecting the urea aqueous solution into the bent inner sides of the bent tubes 51 and 52 in this way, adhesion of the urea aqueous solution to the inner walls of the bent tubes 51 and 52 and precipitation of urea can be suppressed.

（第３実施形態）
第３実施形態は、第１実施形態と同様にして車載ディーゼルエンジンの排気を浄化する尿素ＳＣＲ装置である。以下、図３を参照しながら、本実施形態の尿素ＳＣＲ装置６０の構成及び効果をこの順に説明する。図３は、本実施形態の尿素ＳＣＲ装置６０をエンジンへの取付状態で水平方向から見たものである。なお、第３実施形態の尿素ＳＣＲ装置を構成する構成要素のうち、第１実施形態の対応する構成要素と実質的に同一のものには、同一符号を付して、それらの説明を省略する。 (Third embodiment)
The third embodiment is a urea SCR device that purifies exhaust from an in-vehicle diesel engine as in the first embodiment. Hereinafter, the configuration and effects of the urea SCR device 60 of the present embodiment will be described in this order with reference to FIG. FIG. 3 is a view of the urea SCR device 60 of the present embodiment as viewed from the horizontal direction in a state of being attached to the engine. Note that, among the components constituting the urea SCR device of the third embodiment, the same components as the corresponding components of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. .

図３に示す尿素ＳＣＲ装置６０では、触媒ケース３１の直管部３１ａの中心軸線３３を基準に曲がり管１２の曲げ内側（上流側）にオフセットさせて、噴射弁４０から尿素水溶液を噴射するようになっている。詳しくは、突出部６３は、曲がり管１２の曲げ外側において触媒ケース３１とは反対側に突出する筒状に形成されており、その中心軸線が触媒ケース３１の直管部３１ａの中心軸線３３に対して曲がり管１２の曲げ内側（鉛直上方）にずれて曲がり管１２の管内に開口している。また、突出部６３の触媒ケース３１とは反対側の端面６３ａの中央において、噴射弁４０のノズル部４１に設けられた噴孔が突出部６３内に開口している。そして、ノズル４１に形成された噴孔の噴霧中心６２が水平方向を向くように、噴射弁４０が突出部６３の端面６３ａに取り付けられている。このように尿素水溶液を曲がり管１２の曲げ内側に噴射することにより、第１実施形態と同様に曲がり管１２及び直管部３１ａの内壁への尿素水溶液の付着及び尿素の析出を抑制することができる。   In the urea SCR device 60 shown in FIG. 3, the urea aqueous solution is injected from the injection valve 40 by being offset to the bending inner side (upstream side) of the bent pipe 12 with respect to the central axis 33 of the straight pipe portion 31 a of the catalyst case 31. It has become. Specifically, the protrusion 63 is formed in a cylindrical shape that protrudes to the opposite side of the catalyst case 31 on the outer side of the bent pipe 12, and the central axis thereof is aligned with the central axis 33 of the straight pipe portion 31 a of the catalyst case 31. On the other hand, the bent pipe 12 is displaced inwardly (vertically upward) and opens into the bent pipe 12. Further, an injection hole provided in the nozzle portion 41 of the injection valve 40 opens into the protrusion 63 at the center of the end surface 63 a of the protrusion 63 opposite to the catalyst case 31. And the injection valve 40 is attached to the end surface 63a of the protrusion part 63 so that the spray center 62 of the nozzle hole formed in the nozzle 41 faces the horizontal direction. By injecting the urea aqueous solution into the bent inner side of the bent tube 12 in this way, it is possible to suppress adhesion of urea aqueous solution and precipitation of urea to the inner wall of the bent tube 12 and the straight pipe portion 31a as in the first embodiment. it can.

（他の実施形態）
本発明は上記実施形態の記載内容に限定されず、例えば次のように実施されてもよい。 (Other embodiments)
The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

・上記第１、第２実施形態では、尿素水溶液の噴射方向を排気の流向を考慮して排気通路の曲部の曲げ内側に向けた。詳しくは、第１実施形態では、尿素水溶液の噴射方向を触媒ケース３１の中心軸線３３よりも曲がり管１２の曲げ内側に向けた（図１参照）。また、第２実施形態では、尿素水溶液の噴射方向を、曲がり管５１，５２の中心軸線５４に対する接線５５よりも曲がり管５１，５２の曲げ内側に向けた（図２参照）。一方、第３実施形態では、尿素水溶液の噴射方向を排気の流向を考慮して排気通路の曲部の曲げ内側にオフセットさせた。詳しくは、尿素水溶液の噴射方向を触媒ケース３１の中心軸線３３よりも曲がり管１２の曲げ内側にオフセットさせた（図３参照）。   In the first and second embodiments, the injection direction of the urea aqueous solution is directed to the inside of the bent portion of the exhaust passage in consideration of the exhaust flow direction. Specifically, in the first embodiment, the injection direction of the urea aqueous solution is directed to the bending inner side of the bent pipe 12 with respect to the central axis 33 of the catalyst case 31 (see FIG. 1). Moreover, in 2nd Embodiment, the injection direction of urea aqueous solution was orient | assigned to the bending inner side of the bending pipes 51 and 52 rather than the tangent line 55 with respect to the central axis 54 of the bending pipes 51 and 52 (refer FIG. 2). On the other hand, in the third embodiment, the injection direction of the urea aqueous solution is offset to the bending inner side of the curved portion of the exhaust passage in consideration of the exhaust flow direction. Specifically, the injection direction of the urea aqueous solution was offset from the central axis 33 of the catalyst case 31 to the inside of the bent pipe 12 (see FIG. 3).

しかしながら、図４に示すように、尿素水溶液の噴射方向を排気通路の曲部の曲げ内側に向け、かつ尿素水溶液の噴射方向を排気通路の曲部の曲げ内側にオフセットさせてもよい。なお、図４に示す尿素ＳＣＲ装置７０の各構成要素は、噴射弁４０の突出部６３への取付態様を除き、図３に示す尿素ＳＣＲ装置６０の対応する構成要素と実質的に同一である。   However, as shown in FIG. 4, the injection direction of the urea aqueous solution may be offset toward the inside of the bent portion of the exhaust passage, and the injection direction of the urea aqueous solution may be offset to the inside of the bent portion of the exhaust passage. Each component of the urea SCR device 70 shown in FIG. 4 is substantially the same as the corresponding component of the urea SCR device 60 shown in FIG. 3 except for the manner of attachment of the injection valve 40 to the protrusion 63. .

・上記第１実施形態では、ＳＣＲ触媒３０がＤＰＦ２０よりも下方に位置するように尿素ＳＣＲ装置１０をエンジンに取り付けるものとして説明した。しかしながら、これに限られず、例えば、ＳＣＲ触媒３０がＤＰＦ２０よりも上方に位置するように尿素ＳＣＲ装置１０をエンジンに取り付けてもよいし、例えばＳＣＲ触媒３０及びＤＰＦ２０が同一平面上に位置するように尿素ＳＣＲ装置１０をエンジンに取り付けてもよい。この場合でも、第１実施形態と同様の効果を得ることができる。   In the first embodiment, the urea SCR device 10 is attached to the engine so that the SCR catalyst 30 is positioned below the DPF 20. However, the present invention is not limited to this. For example, the urea SCR device 10 may be attached to the engine so that the SCR catalyst 30 is located above the DPF 20, or, for example, the SCR catalyst 30 and the DPF 20 may be located on the same plane. The urea SCR device 10 may be attached to the engine. Even in this case, the same effect as the first embodiment can be obtained.

また、上記第２実施形態では、ＳＣＲ触媒３０及びＤＰＦ２０が同一水平面上に位置するように尿素ＳＣＲ装置５０をエンジンに取り付けるものとして説明した。しかしながら、これに限られず、例えばＳＣＲ触媒３０がＤＰＦ２０よりも下方に位置するように尿素ＳＣＲ装置５０をエンジンに取り付けてもよいし、例えばＳＣＲ触媒３０がＤＰＦ２０よりも上方に位置するように尿素ＳＣＲ装置５０をエンジンに取り付けてもよい。この場合でも、第２実施形態と同様の効果を得ることができる。   In the second embodiment, the urea SCR device 50 is attached to the engine so that the SCR catalyst 30 and the DPF 20 are positioned on the same horizontal plane. However, the present invention is not limited to this. For example, the urea SCR device 50 may be attached to the engine so that the SCR catalyst 30 is positioned below the DPF 20, or the urea SCR so that the SCR catalyst 30 is positioned above the DPF 20, for example. The device 50 may be attached to the engine. Even in this case, the same effect as the second embodiment can be obtained.

また、上記第３実施形態では、ＳＣＲ触媒３０がＤＰＦ２０よりも下方に位置するように尿素ＳＣＲ装置６０をエンジンに取り付けるものとして説明した。しかしながら、これに限られず、例えば、ＳＣＲ触媒３０がＤＰＦ２０よりも上方に位置するように尿素ＳＣＲ装置１０をエンジンに取り付けてもよいし、例えばＳＣＲ触媒３０及びＤＰＦ２０が同一平面上に位置するように尿素ＳＣＲ装置１０をエンジンに取り付けてもよい。この場合でも、第３実施形態と同様の効果を得ることができる。   In the third embodiment, the urea SCR device 60 is attached to the engine so that the SCR catalyst 30 is positioned below the DPF 20. However, the present invention is not limited to this. For example, the urea SCR device 10 may be attached to the engine so that the SCR catalyst 30 is located above the DPF 20, or, for example, the SCR catalyst 30 and the DPF 20 may be located on the same plane. The urea SCR device 10 may be attached to the engine. Even in this case, the same effect as the third embodiment can be obtained.

・上記実施形態では、噴射装置として、加圧供給される還元剤（尿素水溶液）を噴射することにより排気通路内に還元剤の噴霧を形成する噴射弁４０を例示した。しかしながら、これに限られず、噴射装置は、還元剤（尿素水溶液）を圧縮ガス（圧縮空気）共々噴射することにより排気通路内に還元剤の噴霧を形成するものでもよい。   In the above-described embodiment, the injection valve 40 that forms the spray of the reducing agent in the exhaust passage by injecting the reducing agent (urea aqueous solution) supplied under pressure is exemplified as the injection device. However, the present invention is not limited to this, and the injection device may form a spray of the reducing agent in the exhaust passage by injecting the reducing agent (urea aqueous solution) together with the compressed gas (compressed air).

第１実施形態の尿素ＳＣＲ装置の構成を示す図。The figure which shows the structure of the urea SCR apparatus of 1st Embodiment. 第２実施形態の尿素ＳＣＲ装置の構成を示す図。The figure which shows the structure of the urea SCR apparatus of 2nd Embodiment. 第３実施形態の尿素ＳＣＲ装置の構成を示す図。The figure which shows the structure of the urea SCR apparatus of 3rd Embodiment. 他の実施形態の尿素ＳＣＲ装置の構成を示す図。The figure which shows the structure of the urea SCR apparatus of other embodiment. 比較例の尿素ＳＣＲ装置の構成を示す図。The figure which shows the structure of the urea SCR apparatus of a comparative example.

符号の説明Explanation of symbols

１０…尿素ＳＣＲ装置（排気浄化装置）、１１…曲がり管、１２…曲がり管、２０…ＤＰＦ、２１…ＤＰＦケース、２２…ＤＰＦ担体、３０…ＳＣＲ触媒（選択還元触媒）、３１…触媒ケース、３２…触媒担体、４０…噴射弁（噴射装置）、４１…ノズル部。   DESCRIPTION OF SYMBOLS 10 ... Urea SCR apparatus (exhaust gas purification apparatus), 11 ... Curved pipe, 12 ... Curved pipe, 20 ... DPF, 21 ... DPF case, 22 ... DPF carrier, 30 ... SCR catalyst (selective reduction catalyst), 31 ... Catalyst case, 32 ... Catalyst carrier, 40 ... Injection valve (injection device), 41 ... Nozzle part.

Claims (6)

内燃機関の排気を流す排気通路と、前記内燃機関の排気に含まれる特定成分を選択的に還元するための選択還元触媒と、その還元反応に供される還元剤を前記選択還元触媒に対して噴射供給する噴射装置とを備え、前記内燃機関の排気を前記還元反応によって浄化する排気浄化装置において、
前記排気通路は前記選択還元触媒よりも排気上流側に曲部を有し、
前記噴射装置は、前記曲部の曲げ外側に設けられ、前記曲部の排気下流側の中心軸線に対する接線よりも前記曲部の曲げ内側に向けて前記還元剤を噴射することを特徴とする排気浄化装置。 An exhaust passage through which the exhaust gas of the internal combustion engine flows, a selective reduction catalyst for selectively reducing a specific component contained in the exhaust gas of the internal combustion engine, and a reducing agent to be used in the reduction reaction with respect to the selective reduction catalyst An exhaust gas purification apparatus that purifies exhaust gas from the internal combustion engine by the reduction reaction,
The exhaust passage has a curved portion on the exhaust upstream side of the selective reduction catalyst,
The exhaust device is provided on an outer side of the bent portion of the bent portion, and exhausts the reducing agent toward an inner side of the bent portion of the bent portion with respect to a tangent to a central axis on the exhaust gas downstream side of the bent portion. Purification equipment. 内燃機関の排気を流す排気通路と、前記内燃機関の排気に含まれる特定成分を選択的に還元するための選択還元触媒と、その還元反応に供される還元剤を前記選択還元触媒に対して噴射供給する噴射装置とを備え、前記内燃機関の排気を前記還元反応によって浄化する排気浄化装置において、
前記排気通路は前記選択還元触媒よりも排気上流側に曲部を有し、
前記噴射装置は、前記曲部の曲げ外側に設けられ、前記曲部の排気下流側の中心軸線に対する接線を基準に噴霧中心を前記曲部の曲げ内側にオフセットさせて前記還元剤を噴射することを特徴とする排気浄化装置。 An exhaust passage through which the exhaust gas of the internal combustion engine flows, a selective reduction catalyst for selectively reducing a specific component contained in the exhaust gas of the internal combustion engine, and a reducing agent to be used in the reduction reaction for the selective reduction catalyst An exhaust gas purification apparatus that purifies exhaust gas from the internal combustion engine by the reduction reaction,
The exhaust passage has a curved portion on the exhaust upstream side of the selective reduction catalyst,
The injection device is provided outside the bent portion of the bent portion, and injects the reducing agent by offsetting the spray center to the bent inner side of the bent portion with reference to a tangent to the central axis on the exhaust downstream side of the bent portion. An exhaust purification device characterized by the above. 内燃機関の排気を流す排気通路と、前記内燃機関の排気に含まれる特定成分を選択的に還元するための選択還元触媒と、その還元反応に供される還元剤を前記選択還元触媒に対して噴射供給する噴射装置とを備え、前記内燃機関の排気を前記還元反応によって浄化する排気浄化装置において、
前記排気通路は前記選択還元触媒よりも排気上流側に曲部を有し、
前記噴射装置は、前記曲部の曲げ外側に設けられ、前記曲部の排気下流側の中心軸線に対する接線よりも前記曲部の曲げ内側に向けて、かつ前記接線を基準に噴霧中心を前記曲部の曲げ内側にオフセットさせて前記還元剤を噴射することを特徴とする排気浄化装置。 An exhaust passage through which the exhaust gas of the internal combustion engine flows, a selective reduction catalyst for selectively reducing a specific component contained in the exhaust gas of the internal combustion engine, and a reducing agent to be used in the reduction reaction for the selective reduction catalyst An exhaust gas purification apparatus that purifies exhaust gas from the internal combustion engine by the reduction reaction,
The exhaust passage has a curved portion on the exhaust upstream side of the selective reduction catalyst,
The injection device is provided on the outer side of the bent portion of the bent portion, and is directed toward the inner side of the bent portion of the bent portion with respect to the central axis on the exhaust downstream side of the bent portion, and the bend center with respect to the tangent. An exhaust emission control device, wherein the reducing agent is injected while being offset to the inside of the bending portion. 前記排気通路は、前記曲部の排気下流側端から前記選択還元触媒の排気上流側端まで排気を導く直管状の直部を有し、前記曲部の排気下流側端において前記曲部の中心軸線に対する接線と前記直部の中心軸線とが一致するように形成され、
前記噴射装置は、前記直部の中心軸線よりも前記曲部の曲げ内側に向けて前記還元剤を噴射する請求項１又は３に記載の排気浄化装置。 The exhaust passage has a straight tubular straight portion that guides exhaust gas from an exhaust downstream end of the curved portion to an exhaust upstream end of the selective reduction catalyst, and a center of the curved portion at an exhaust downstream end of the curved portion A tangent to the axis is formed so that the central axis of the straight part coincides,
The exhaust emission control device according to claim 1 or 3, wherein the injection device injects the reducing agent toward a bending inner side of the curved portion with respect to a central axis of the straight portion. 前記排気通路は、前記曲部の排気下流側端から前記選択還元触媒の排気上流側端まで排気を導く直管状の直部を有し、前記曲部の排気下流側端において前記曲部の中心軸線に対する接線と前記直部の中心軸線とが一致するように形成され、
前記噴射装置は、前記直部の中心軸線を基準に噴霧中心を前記曲部の曲げ内側にオフセットさせて前記還元剤を噴射する請求項２又は３に記載の排気浄化装置。 The exhaust passage has a straight tubular straight portion that guides exhaust gas from an exhaust downstream end of the curved portion to an exhaust upstream end of the selective reduction catalyst, and a center of the curved portion at an exhaust downstream end of the curved portion A tangent to the axis is formed so that the central axis of the straight part coincides,
4. The exhaust emission control device according to claim 2, wherein the injection device injects the reducing agent by offsetting a spray center to a bending inner side of the curved portion with respect to a central axis of the straight portion. 前記還元剤は尿素水溶液であり、
前記選択還元触媒はアンモニア選択還元触媒である請求項１から５のいずれか一項に記載の排気浄化装置。 The reducing agent is an aqueous urea solution;
The exhaust gas purification apparatus according to any one of claims 1 to 5, wherein the selective reduction catalyst is an ammonia selective reduction catalyst.
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