JP5114219B2 - Exhaust gas purification device for internal combustion engine - Google Patents

Exhaust gas purification device for internal combustion engine Download PDF

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JP5114219B2
JP5114219B2 JP2008003537A JP2008003537A JP5114219B2 JP 5114219 B2 JP5114219 B2 JP 5114219B2 JP 2008003537 A JP2008003537 A JP 2008003537A JP 2008003537 A JP2008003537 A JP 2008003537A JP 5114219 B2 JP5114219 B2 JP 5114219B2
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cylindrical case
end side
exhaust gas
internal combustion
combustion engine
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JP2009167806A (en
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大輔 白井
潤 木地谷
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Tokyo Roki Co Ltd
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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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N13/009—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
    • F01N13/0097—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 the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—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
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Description

本発明は、内燃機関用の排ガス浄化装置に関する。   The present invention relates to an exhaust gas purification apparatus for an internal combustion engine.

内燃機関用の排ガス浄化装置は、内燃機関から排出された排ガスを浄化するための装置である（例えば、下記特許文献１，２参照）。この種の装置として、従来、筒状ケース内に、排ガス流入口から順に、ＤＯＣ(Diesel Oxidation Catalyst)、ＤＰＦ(Diesel Particulate Filter) 、ＳＣＲ（Selective Catalytic Reduction) 及びアンモニアスリップ（例えば、ＤＯＣ等）が、直列に収納されており、ＤＰＦとＳＣＲとの間に還元剤供給ノズルが設けられているものが知られている。
特表２００２−５０２９２７号公報 ＥＰ０７５８７１３Ａ１号公報 An exhaust gas purification device for an internal combustion engine is a device for purifying exhaust gas discharged from the internal combustion engine (see, for example, Patent Documents 1 and 2 below). Conventionally, as this type of device, there are a DOC (Diesel Oxidation Catalyst), a DPF (Diesel Particulate Filter), an SCR (Selective Catalytic Reduction), and an ammonia slip (for example, DOC, etc.) in order from the exhaust gas inlet. , Which are housed in series and are provided with a reducing agent supply nozzle between the DPF and the SCR are known.
Japanese translation of PCT publication No. 2002-502927 EP0758713A1 publication

ところで、上記の装置にあっては、還元剤供給ノズルとＳＣＲとの距離が長いほど、還元剤（例えば、尿素、アンモニア等）と排ガスとの混合が促進して、排ガスの浄化効率が向上することとなる。従って、かかる装置にあっては、両者の距離を長くしておくことが望ましい。   By the way, in the above apparatus, the longer the distance between the reducing agent supply nozzle and the SCR, the more the mixing of the reducing agent (for example, urea, ammonia, etc.) and the exhaust gas is promoted, and the exhaust gas purification efficiency is improved. It will be. Therefore, in such a device, it is desirable to increase the distance between the two.

しかしながら、従来の装置の如く、ＤＯＣ、ＤＰＦ、ＳＣＲ及びアンモニアスリップが直列に収納されたままの状態で、還元剤供給ノズルとＳＣＲとの距離を長くした場合には、装置全体が長尺化してしまう。そして、このように装置全体が長尺化してしまうと、車輌への搭載が困難になる等の問題が生じることとなる。   However, when the distance between the reducing agent supply nozzle and the SCR is increased with the DOC, DPF, SCR, and ammonia slip being stored in series as in the conventional apparatus, the entire apparatus becomes longer. End up. If the entire apparatus becomes long in this way, problems such as difficulty in mounting on the vehicle arise.

本発明は、上記課題に鑑みてなされたものであり、還元剤供給ノズルとＳＣＲとの距離を長くしつつ、装置全体の長尺化を防止することが可能な内燃機関用の排ガス浄化装置を提供することを目的とする。   The present invention has been made in view of the above problems, and provides an exhaust gas purification apparatus for an internal combustion engine that can prevent the entire apparatus from being elongated while increasing the distance between the reducing agent supply nozzle and the SCR. The purpose is to provide.

上記課題を解決するために、本発明に係る内燃機関用の排ガス浄化装置は、排ガス流入口が一端側に設けられ当該一端側から順にＤＯＣ及びＤＰＦが収納される第一の筒状ケースと、排ガス流出口が一端側に設けられ当該一端側から順にアンモニアスリップ及びＳＣＲが収納される第二の筒状ケースと、を備え、前記第一の筒状ケースと前記第二の筒状ケースとが並列に配置されるとともに、第一の筒状ケースの前記一端側と第二の筒状ケースの前記一端側とが相互に反対向きとなるように配置されており、前記第一の筒状ケースの他端側と前記第二の筒状ケースの他端側とが連結パイプにより連結され、前記連結パイプの上流側に還元剤供給ノズルが設けられ、前記連結パイプは、直管部と、その両端側の連結部と、を備え、前記連結部は、いずれも前記第一の筒状ケース及び前記第二の筒状ケースの両軸を含む平面に対して同じ側から直交し、且つそれぞれが前記第一の筒状ケースの他端側若しくは前記第二の筒状ケースの他端側に対して接線方向に、前記第一の筒状ケース若しくは前記第二の筒状ケースの軸に対して前記第一の筒状ケース若しくは前記第二の筒状ケースの径方向にずれるように連結されており、前記還元剤供給ノズルが前記直管部の軸方向の上流側に設けられていることを特徴とする。 In order to solve the above problems, an exhaust gas purification apparatus for an internal combustion engine according to the present invention includes a first cylindrical case in which an exhaust gas inlet is provided on one end side, and DOC and DPF are stored in order from the one end side; An exhaust gas outlet is provided on one end side, and a second cylindrical case in which ammonia slip and SCR are stored in order from the one end side, and the first cylindrical case and the second cylindrical case include The first cylindrical case is arranged in parallel and arranged so that the one end side of the first cylindrical case and the one end side of the second cylindrical case are opposite to each other. The other end side of the second cylindrical case and the other end side of the second cylindrical case are connected by a connecting pipe, and a reducing agent supply nozzle is provided on the upstream side of the connecting pipe. A connecting portion on both ends, the connecting portion is Both are orthogonal to the plane including both axes of the first cylindrical case and the second cylindrical case from the same side, and each is the other end side of the first cylindrical case or the second The first cylindrical case or the second cylindrical case with respect to the axis of the first cylindrical case or the second cylindrical case in a tangential direction with respect to the other end side of the cylindrical case And the reducing agent supply nozzle is provided on the upstream side in the axial direction of the straight pipe portion.

このような構成とした場合には、その構造上、還元剤供給ノズルとＳＣＲとの距離を長くすることが可能となる。また、かかる場合には、ＤＯＣ及びＤＰＦと、ＳＣＲ及びアンモニアスリップとが、並列に収納されることとなるので、これらが直列に収納された場合と比べて、装置全体の長尺化を防止することが可能となる。   In such a configuration, the distance between the reducing agent supply nozzle and the SCR can be increased due to the structure. In such a case, since the DOC and DPF, the SCR, and the ammonia slip are stored in parallel, the overall length of the apparatus is prevented as compared with the case where they are stored in series. It becomes possible.

また、還元剤供給ノズルとＳＣＲとの距離をよりいっそう長くすることが可能となる。しかも、かかる場合には、装置全体の長尺化を防止するだけでなく、装置全体をよりコンパクトにすることも可能となる。 In addition , the distance between the reducing agent supply nozzle and the SCR can be further increased. In addition, in such a case, it is possible not only to prevent the entire apparatus from being elongated, but also to make the entire apparatus more compact.

本発明によれば、還元剤供給ノズルとＳＣＲとの距離を長くしつつ、装置全体の長尺化を防止することが可能となる。   According to the present invention, it is possible to prevent the entire apparatus from being elongated while increasing the distance between the reducing agent supply nozzle and the SCR.

以下、図１，２を参照しながら、本発明の実施形態について説明する。図１は本発明の実施形態に係る内燃機関用の排ガス浄化装置を示す斜視図、図２は図１のＡ方向から視た側面図である。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an exhaust gas purifying apparatus for an internal combustion engine according to an embodiment of the present invention, and FIG. 2 is a side view seen from the direction A of FIG.

図１，２に示す内燃機関用の排ガス浄化装置１００は、第一の筒状ケース１０、第二の筒状ケース２０、連結パイプ３０、及び還元剤供給ノズル４０を備えている。   An exhaust gas purification apparatus 100 for an internal combustion engine shown in FIGS. 1 and 2 includes a first cylindrical case 10, a second cylindrical case 20, a connecting pipe 30, and a reducing agent supply nozzle 40.

第一の筒状ケース１０には、排ガス流入口が一端側（図１の「Gas In」側）に設けられ当該一端側から順にＤＯＣ及びＤＰＦが収納される。一方、第二の筒状ケース２０には、排ガス流出口が一端側（図１の「Gas Out」側）に設けられ当該一端側から順にアンモニアスリップ及びＳＣＲが収納される。   The first cylindrical case 10 is provided with an exhaust gas inlet on one end side (“Gas In” side in FIG. 1), and DOC and DPF are stored in that order from the one end side. On the other hand, the second cylindrical case 20 is provided with an exhaust gas outlet on one end side (“Gas Out” side in FIG. 1), and stores ammonia slip and SCR in order from the one end side.

そして、これらの第一の筒状ケース１０及び第二の筒状ケース２０は、保持部材１，２によって並列に配置されるとともに、第一の筒状ケース１０の一端側と第二の筒状ケース２０の一端側とが相互に反対向きとなるように配置されている。また、第一の筒状ケース１０の他端側（図１の場合には、Ａ方向側と反対側）と第二の筒状ケース２０の他端側（図１の場合には、Ａ方向側）とが連結パイプ３０により連結されており、連結パイプ３０の上流側には、還元剤供給ノズル４０が設けられている。   The first cylindrical case 10 and the second cylindrical case 20 are arranged in parallel by the holding members 1 and 2, and one end side of the first cylindrical case 10 and the second cylindrical case. It arrange | positions so that the one end side of case 20 may become opposite direction mutually. Further, the other end side of the first cylindrical case 10 (in the case of FIG. 1, the side opposite to the A direction side) and the other end side of the second cylindrical case 20 (in the case of FIG. 1, the A direction). Are connected by a connecting pipe 30, and a reducing agent supply nozzle 40 is provided on the upstream side of the connecting pipe 30.

この連結パイプ３０は、直管部３１と、その両端側の連結部３２，３３と、を備えている。これらの連結部３２，３３は、いずれも第一の筒状ケース１０の軸１１及び第二の筒状ケース２０の軸２１を含む平面５０に対して同じ側（図２の場合には、左側）から直交し、且つそれぞれが第一の筒状ケース１０の他端側若しくは第二の筒状ケース２０の他端側に対して接線方向に連結されている。また、還元剤供給ノズル４０は、直管部３１の軸３１ａに対してその上流側に設けられている。   The connection pipe 30 includes a straight pipe portion 31 and connection portions 32 and 33 on both ends thereof. These connecting portions 32 and 33 are both on the same side (on the left side in the case of FIG. 2) with respect to the plane 50 including the shaft 11 of the first cylindrical case 10 and the shaft 21 of the second cylindrical case 20. Are orthogonally connected to each other and connected to the other end side of the first cylindrical case 10 or the other end side of the second cylindrical case 20 in a tangential direction. The reducing agent supply nozzle 40 is provided on the upstream side of the shaft 31 a of the straight pipe portion 31.

以上の通り、内燃機関用の排ガス浄化装置１００にあっては、連結パイプ３０側から視ると、排ガスが略Ｚ字状に流れるように構成されている。このような構成とした場合には、還元剤供給ノズル４０とＳＣＲとの距離を長くすることが可能となり、さらには、第二の筒状ケース２０の他流側、すなわち、ＳＣＲの上流側において、排ガスに旋回流を生じさせることも可能となる。これにより、ＳＣＲの上流側にミキサ構造体を設けることなく、排ガスと還元剤との混合が十分に促進することとなる。従って、このような内燃機関用の排ガス浄化装置１００にあっては、排ガスと還元剤との混合物をＳＣＲに対して均一な状態で供給することが可能となり、その結果、排ガスの浄化効率が向上することとなる。また、上記の構成とした場合には、ＤＯＣ及びＤＰＦと、ＳＣＲ及びアンモニアスリップとが、並列に収納されることとなるので、これらが直列に収納された場合と比べて、装置全体の長尺化を防止することが可能となる。さらに、かかる場合には、装置全体の長尺化を防止するだけでなく、装置全体をよりコンパクトにすることも可能となる。   As described above, the exhaust gas purification apparatus 100 for an internal combustion engine is configured such that the exhaust gas flows in a substantially Z shape when viewed from the connecting pipe 30 side. In such a configuration, the distance between the reducing agent supply nozzle 40 and the SCR can be increased, and further, on the other flow side of the second cylindrical case 20, that is, on the upstream side of the SCR. It is also possible to generate a swirl flow in the exhaust gas. As a result, the mixing of the exhaust gas and the reducing agent is sufficiently promoted without providing a mixer structure upstream of the SCR. Therefore, in such an exhaust gas purification apparatus 100 for an internal combustion engine, it becomes possible to supply a mixture of exhaust gas and a reducing agent in a uniform state to the SCR, and as a result, the exhaust gas purification efficiency is improved. Will be. Further, in the case of the above configuration, the DOC and DPF, the SCR, and the ammonia slip are stored in parallel. Therefore, compared to the case where these are stored in series, the overall length of the apparatus is long. Can be prevented. Furthermore, in such a case, it is possible not only to prevent the entire apparatus from being elongated, but also to make the entire apparatus more compact.

本発明の実施形態に係る内燃機関用の排ガス浄化装置を示す斜視図である。1 is a perspective view showing an exhaust gas purification apparatus for an internal combustion engine according to an embodiment of the present invention. 図１のＡ方向から視た側面図である。It is the side view seen from the A direction of FIG.

符号の説明Explanation of symbols

１０ 第一の筒状ケース
２０ 第二の筒状ケース
３０ 連結パイプ
３１ 直管部
３２ 連結部
４０ 還元剤供給ノズル
５０ 平面
１００ 内燃機関用の排ガス浄化装置 DESCRIPTION OF SYMBOLS 10 1st cylindrical case 20 2nd cylindrical case 30 Connection pipe 31 Straight pipe part 32 Connection part 40 Reductant supply nozzle 50 Plane 100 Exhaust gas purification apparatus for internal combustion engines

Claims (1)

排ガス流入口が一端側に設けられ当該一端側から順にＤＯＣ及びＤＰＦが収納される第一の筒状ケースと、
排ガス流出口が一端側に設けられ当該一端側から順にアンモニアスリップ及びＳＣＲが収納される第二の筒状ケースと、を備え、
前記第一の筒状ケースと前記第二の筒状ケースとが並列に配置されるとともに、第一の筒状ケースの前記一端側と第二の筒状ケースの前記一端側とが相互に反対向きとなるように配置されており、前記第一の筒状ケースの他端側と前記第二の筒状ケースの他端側とが連結パイプにより連結され、前記連結パイプの上流側に還元剤供給ノズルが設けられ、
前記連結パイプは、直管部と、その両端側の連結部と、を備え、
前記連結部は、いずれも前記第一の筒状ケース及び前記第二の筒状ケースの両軸を含む平面に対して同じ側から直交し、且つそれぞれが前記第一の筒状ケースの他端側若しくは前記第二の筒状ケースの他端側に対して接線方向に、前記第一の筒状ケース若しくは前記第二の筒状ケースの軸に対して前記第一の筒状ケース若しくは前記第二の筒状ケースの径方向にずれるように連結されており、前記還元剤供給ノズルが前記直管部の軸方向の上流側に設けられていることを特徴とする内燃機関用の排ガス浄化装置。 A first cylindrical case in which an exhaust gas inlet is provided on one end side and DOC and DPF are stored in order from the one end side;
A second cylindrical case in which an exhaust gas outlet is provided on one end side and ammonia slip and SCR are accommodated in order from the one end side;
The first cylindrical case and the second cylindrical case are arranged in parallel, and the one end side of the first cylindrical case and the one end side of the second cylindrical case are opposite to each other. The other end side of the first cylindrical case and the other end side of the second cylindrical case are connected by a connecting pipe, and the reducing agent is upstream of the connecting pipe. A supply nozzle is provided,
The connecting pipe includes a straight pipe portion and connecting portions on both ends thereof,
The connecting portions are orthogonal to the plane including both axes of the first cylindrical case and the second cylindrical case from the same side, and each is the other end of the first cylindrical case. Side or the other end side of the second cylindrical case, tangentially to the first cylindrical case or the axis of the second cylindrical case, the first cylindrical case or the second An exhaust gas purifying apparatus for an internal combustion engine, wherein the exhaust pipe is connected so as to be displaced in a radial direction of the second cylindrical case, and the reducing agent supply nozzle is provided on the upstream side in the axial direction of the straight pipe portion. .
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