JP2007040149A - Exhaust emission control device of internal combustion engine - Google Patents

Exhaust emission control device of internal combustion engine Download PDF

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JP2007040149A
JP2007040149A JP2005224040A JP2005224040A JP2007040149A JP 2007040149 A JP2007040149 A JP 2007040149A JP 2005224040 A JP2005224040 A JP 2005224040A JP 2005224040 A JP2005224040 A JP 2005224040A JP 2007040149 A JP2007040149 A JP 2007040149A
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exhaust
oxidation catalyst
catalyst
stage oxidation
internal combustion
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Inventor
Reiko Domeki
Hiroaki Fujita
Satoshi Hiranuma
Shinichi Saito
Ritsuko Shinozaki
Yasuko Suzuki
Yoshihisa Takeda
智 平沼
真一 斎藤
好央 武田
礼子 百目木
律子 篠▲崎▼
博昭 藤田
康子 鈴木
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Mitsubishi Fuso Truck & Bus Corp
三菱ふそうトラック・バス株式会社
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Priority to JP2005224040A priority Critical patent/JP2007040149A/en
Publication of JP2007040149A publication Critical patent/JP2007040149A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/24Exhaust 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
    • F01N3/28Construction of catalytic reactors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/009Exhaust 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
    • F01N13/0097Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/033Exhaust 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
    • F01N3/035Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/105General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106Auxiliary oxidation catalysts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/18Exhaust 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
    • F01N3/20Exhaust 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
    • F01N3/2066Selective catalytic reduction [SCR]
    • F01N3/208Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/04Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of an exhaust pipe, manifold or apparatus in relation to vehicle frame or particular vehicle parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/02Adding substances to exhaust gases the substance being ammonia or urea
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/10Capture or disposal of greenhouse gases of nitrous oxide (N2O)
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the mountability onto a vehicle and the heat retaining property in a casing. <P>SOLUTION: The device is equipped with an inner wall which is arranged so as to partition into four chambers in a latticed manner the inside of a casing (18) in which exhaust from an internal combustion engine is led and to successively flow the exhaust from the internal combustion engine through each of four chambers, wherein a prior stage oxidation catalyst (28), a particulate filter (32), a selective reduction type NOx catalyst (42) for removing NOx in exhaust by adding aqueous urea and a post-stage oxidation catalyst (46) are sequentially stored from the chamber placed on the upstream side in the flow of exhaust in the casing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内燃機関の排気浄化装置に係り、詳しくは、アンモニアを還元剤として排気中の窒素酸化物を還元浄化させる触媒と排気中のパティキュレートを捕集するパティキュレートフィルタとを備えた排気浄化装置に関する。   The present invention relates to an exhaust gas purification apparatus for an internal combustion engine, and more specifically, an exhaust gas equipped with a catalyst for reducing and purifying nitrogen oxide in exhaust gas using ammonia as a reducing agent and a particulate filter for collecting particulates in the exhaust gas. The present invention relates to a purification device.
一般に、ディーゼルエンジンの如くリーン空燃比での燃焼が行われる内燃機関では、燃料が気筒内に取り込まれて圧縮された空気に噴射され、自発火によって燃焼するために、NOx(窒素酸化物)の発生が顕著になる。そこで、このNOxからO(酸素)を奪ってN(窒素)に還元させる技術が知られている。
この種の技術の一例としては、尿素を還元剤にして排気中のNOxを選択還元する選択還元型NOx触媒(SCR触媒)が用いられている。具体的には、排気にユリア水(尿素水)を添加すると、尿素がNH(アンモニア)に変化する。そして、SCR触媒内ではこのNHと排気中のNOxとが結びついて水とNとに分解され、NOxの浄化が行われる。
In general, in an internal combustion engine that performs combustion at a lean air-fuel ratio, such as a diesel engine, fuel is taken into a cylinder, injected into compressed air, and burned by self-ignition, so that NOx (nitrogen oxide) Occurrence becomes remarkable. Thus, a technique for depriving O 2 (oxygen) from this NOx and reducing it to N 2 (nitrogen) is known.
As an example of this type of technology, a selective reduction type NOx catalyst (SCR catalyst) that selectively reduces NOx in exhaust gas using urea as a reducing agent is used. Specifically, the addition of urea water (urea water) in the exhaust, urea changes to NH 3 (ammonia). In the SCR catalyst, this NH 3 and NOx in the exhaust are combined and decomposed into water and N 2 to purify NOx.
一方、このディーゼルエンジンでは、上記燃焼の故に排気中に含まれるパティキュレート(PM)の浄化も要求される。このPMについてはパティキュレートフィルタ(DPF)にて捕集され、捕集されたPMは、DPFの強制再生、つまり、DPFの昇温によって強制的に焼却されて浄化される。
ここで、上述したSCR触媒或いはDPFのいずれか一方を備えた単独のシステムではますます厳しくなる排出ガス規制への対応が困難になり得ることを鑑み、これらSCR触媒とDPFとを組み合わせた排気浄化装置の技術が知られている(例えば、特許文献1参照)。
特表2004−535911号公報
On the other hand, this diesel engine is also required to purify particulates (PM) contained in the exhaust gas because of the combustion. This PM is collected by a particulate filter (DPF), and the collected PM is forcibly incinerated and purified by forced regeneration of the DPF, that is, by raising the temperature of the DPF.
Here, in view of the fact that a single system equipped with either the above-mentioned SCR catalyst or DPF may make it difficult to comply with exhaust gas regulations that are becoming increasingly strict, exhaust purification that combines these SCR catalyst and DPF The technique of the apparatus is known (for example, refer to Patent Document 1).
JP-T-2004-535911
ところで、上述の排気浄化装置では、DPFとSCR触媒とは断面同士が向かい合って直列に配置され、これらDPFとSCR触媒とが長筒状の筐体内に収納されている。このように、DPFとSCR触媒とを単純に組み合わせると、上記単独のシステムの約2倍の搭載スペースを要することになり、スペースに余裕の少ない車種には搭載が困難になるとの問題がある。   By the way, in the above-described exhaust purification device, the DPF and the SCR catalyst are arranged in series with their cross-sections facing each other, and the DPF and the SCR catalyst are housed in a long cylindrical casing. As described above, when the DPF and the SCR catalyst are simply combined, a mounting space that is approximately twice that of the single system described above is required, and there is a problem that it is difficult to mount in a vehicle type with a small space.
また、上述の排気浄化装置では、筐体の表面積が大きくなり、筐体内の保温性も悪化することになるが、この点についても課題が残されている。
本発明は、このような課題に鑑みてなされたもので、車両への搭載性及び筐体内の保温性の向上を図ることができる内燃機関の排気浄化装置を提供することを目的とする。
Moreover, in the above-described exhaust purification apparatus, the surface area of the housing is increased, and the heat retention in the housing is also deteriorated, but there is still a problem with this point.
The present invention has been made in view of such a problem, and an object of the present invention is to provide an exhaust gas purification apparatus for an internal combustion engine that can improve mounting properties on a vehicle and heat retention in a housing.
上記の目的を達成するべく、請求項1記載の内燃機関の排気浄化装置は、内燃機関からの排気が導入される筐体と、前記筐体の内部を格子状に4つの室に区切るとともに前記内燃機関からの排気が前記4つの各室を順次流れるように配設された内壁とを備え、前記筐体内における排気流れの上流側に位置する室から順に、前段酸化触媒、パティキュレートフィルタ、ユリア水の添加によって排気中のNOxを浄化する選択還元型NOx触媒、および後段酸化触媒が収納されていることを特徴としている。   In order to achieve the above object, an exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein a casing into which exhaust gas from the internal combustion engine is introduced, and the inside of the casing are partitioned into four chambers in a lattice shape, and And an inner wall arranged so that exhaust from the internal combustion engine sequentially flows through each of the four chambers, and in order from the chamber located upstream of the exhaust flow in the casing, a pre-stage oxidation catalyst, a particulate filter, a urea A selective reduction type NOx catalyst that purifies NOx in the exhaust gas by adding water and a post-stage oxidation catalyst are housed.
また、請求項2記載の発明では、前記筐体は、前記パティキュレートフィルタの出口近傍位置にて前記ユリア水を添加する添加手段と、前記パティキュレートフィルタから排出された排気が隣り合う前記選択還元型NOx触媒に流れる際に前記前段酸化触媒の軸線および前記後段酸化触媒の軸線を含む平面近傍の位置まで迂回させる迂回路形成部とを備えていることを特徴としている。   Further, in the invention according to claim 2, the casing includes the selective reduction in which the urea water is added at a position in the vicinity of the outlet of the particulate filter, and the exhaust discharged from the particulate filter is adjacent. And a detour formation part that detours to a position in the vicinity of a plane including the axis of the front-stage oxidation catalyst and the axis of the rear-stage oxidation catalyst when flowing through the NOx catalyst.
更に、請求項3記載の発明では、前記筐体内に前段酸化触媒、パティキュレートフィルタ、選択還元型NOx触媒、および後段酸化触媒の排気流れ方向が車両前後方向に対して略直交方向となるように各々配置され、前記後段酸化触媒が前記筐体の区切られた室のうちの車両前側で且つ下段に位置する室に配置されたことを特徴としている。   Furthermore, in the invention according to claim 3, the exhaust flow direction of the front stage oxidation catalyst, the particulate filter, the selective reduction type NOx catalyst, and the rear stage oxidation catalyst in the casing is substantially perpendicular to the vehicle longitudinal direction. Each of the rear-stage oxidation catalysts is disposed in a chamber located on the vehicle front side and in the lower stage among the chambers partitioned by the casing.
従って、請求項1記載の本発明の内燃機関の排気浄化装置によれば、前段酸化触媒、パティキュレートフィルタ、選択還元型NOx触媒、及び後段酸化触媒が束ねられて筐体内に収納されているので、従来に比して筐体の表面積の最小化が図られる。この結果、排気浄化装置の重量が軽減され、車両への搭載性が向上する。また、筐体内の保温性が良好となり、排気浄化手段の活性が促進されて浄化率の向上に寄与する。   Therefore, according to the exhaust gas purification apparatus for an internal combustion engine of the first aspect of the present invention, the front stage oxidation catalyst, the particulate filter, the selective reduction type NOx catalyst, and the rear stage oxidation catalyst are bundled and housed in the casing. Thus, the surface area of the housing can be minimized as compared with the conventional case. As a result, the weight of the exhaust emission control device is reduced, and the mountability on the vehicle is improved. In addition, the heat retention in the housing is improved, and the activity of the exhaust gas purification means is promoted, contributing to the improvement of the purification rate.
また、請求項2記載の発明によれば、パティキュレートフィルタと選択還元型NOx触媒との間には迂回路形成部が設けられており、ユリア水は、パティキュレートフィルタの軸線及び選択還元型NOx触媒の軸線を含む平面に沿って選択還元型NOx触媒に導入されるのではなく、前段酸化触媒の軸線及び後段酸化触媒の軸線を含む平面側を経てから選択還元型NOx触媒に導入されている。よって、ユリア水の長い移動経路が確保されるので、ユリア水が排気中に均一に拡散され易くなってNOx浄化率がより一層向上する。   According to the second aspect of the present invention, the detour formation unit is provided between the particulate filter and the selective reduction type NOx catalyst, and urea water is supplied from the axis of the particulate filter and the selective reduction type NOx. Rather than being introduced into the selective catalytic reduction NOx catalyst along a plane including the axis of the catalyst, it is introduced into the selective catalytic reduction NOx catalyst after passing through the plane side including the axis of the preceding oxidation catalyst and the axis of the subsequent oxidation catalyst. . Therefore, since a long movement path of urea water is secured, urea water is easily diffused uniformly in the exhaust gas, and the NOx purification rate is further improved.
更に、請求項3記載の発明によれば、後段酸化触媒が車両前側の下段に位置させたので、排気を筐体の比較的前側の位置から排出することが可能となり、例えばトラックのスペアタイヤ等の後方架装物と排気導出口との距離が遠くなり、この架装物に対する熱害が回避可能となる。   Further, according to the third aspect of the invention, since the rear stage oxidation catalyst is located at the lower stage on the front side of the vehicle, the exhaust can be discharged from a relatively front side position of the housing, such as a spare tire for a truck. The distance between the rear bodywork and the exhaust outlet is increased, and thermal damage to the bodywork can be avoided.
以下、図面により本発明の実施形態について説明する。本実施形態に係る内燃機関の排気浄化装置は、例えば、図1に示されたトラック2に搭載されている。
同図に示されるように、当該トラック2にはキャブ4が備えられ、このキャブ4の下側には、はしご型のフレーム6が後方に向けて延設されている。また、キャブ4とフレーム6との間にはディーゼルエンジン8が配設されており(同図(b))、このエンジン8の後側、詳しくはキャブ4の後面側であってフレーム6の右側部分には排気浄化装置10が配設されている。なお、このフレーム6の左側部分の適宜位置には、燃料タンク12、バッテリ14やユリア水タンク16が配設されている。そして、上記排気浄化装置10には、エンジン8からの排気が導入されており、この導入された排気を浄化し、図示しないマフラを介して外部に放出する。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The exhaust gas purification apparatus for an internal combustion engine according to the present embodiment is mounted, for example, on a truck 2 shown in FIG.
As shown in the figure, the truck 2 is provided with a cab 4, and a ladder-type frame 6 extends rearward under the cab 4. Further, a diesel engine 8 is disposed between the cab 4 and the frame 6 ((b) in the figure). The rear side of the engine 8, more specifically, the rear side of the cab 4 and the right side of the frame 6 is disposed. An exhaust purification device 10 is disposed in the portion. A fuel tank 12, a battery 14, and a urea water tank 16 are disposed at appropriate positions on the left side of the frame 6. Exhaust gas from the engine 8 is introduced into the exhaust gas purification device 10, and the introduced exhaust gas is purified and released to the outside through a muffler (not shown).
当該排気浄化装置10は、図2に示されるように、立方体の筐体18を備えている。この筐体18にはトラック2の進行方向(前方向)に向けて延びた導入ポート20が設けられており、導入ポート20がエンジン8に接続されることにより、エンジン8からの排気は筐体18内に導入される。
また、この筐体18内には4つの円筒状の排気浄化手段が収納され、トラック2の幅方向に沿ってそれぞれ配設されている。具体的には、図2のA−A線に沿う図3(a)に示されるように、エンジン8から上記マフラまでの排気の流れ方向でみて、前段酸化触媒28、DPF(パティキュレートフィルタ)32、SCR触媒(選択還元型NOx触媒)42、及び後段酸化触媒46が順次介挿されている。
As shown in FIG. 2, the exhaust purification device 10 includes a cubic housing 18. The casing 18 is provided with an introduction port 20 extending in the traveling direction (forward direction) of the track 2. When the introduction port 20 is connected to the engine 8, exhaust from the engine 8 is exhausted to the casing. 18 is introduced.
Also, four cylindrical exhaust purification means are accommodated in the casing 18 and are arranged along the width direction of the track 2. Specifically, as shown in FIG. 3A along the line AA in FIG. 2, when viewed in the flow direction of the exhaust gas from the engine 8 to the muffler, the pre-stage oxidation catalyst 28, DPF (particulate filter) 32, an SCR catalyst (selective reduction type NOx catalyst) 42, and a post-stage oxidation catalyst 46 are sequentially inserted.
当該前段酸化触媒28では、排気中のNOを酸化させてNOを生成しており、このNOを酸化剤としてDPF32に供給している。また、DPF32は、排気の上流側と下流側とを連通させる複数個の通路が並設されているとともに、各通路の上流側の開口部分と下流側の開口部分とが交互に閉鎖されている。そして、このDPF32では、排気中のパティキュレート(PM)を捕集して堆積させる一方、このPMと前段酸化触媒28から供給されたNOとの反応によって堆積したPMを燃焼する。 In the pre-stage oxidation catalyst 28, NO 2 in the exhaust is oxidized to generate NO 2 , and this NO 2 is supplied to the DPF 32 as an oxidant. The DPF 32 includes a plurality of passages that allow the upstream side and the downstream side of the exhaust to communicate with each other, and the upstream opening portion and the downstream opening portion of each passage are alternately closed. . The DPF 32 collects and deposits particulates (PM) in the exhaust gas, and combusts the PM deposited by the reaction between the PM and NO 2 supplied from the pre-stage oxidation catalyst 28.
次に、SCR触媒42は、添加されたNHを吸着させ、このNHを還元剤として排気中のNOxを浄化している。また、後段酸化触媒46では、SCR触媒42において余剰になることがあるNHを酸化させてNを生成し、更に、DPF32によるPMの燃焼に伴って生じる場合があるCOを酸化させてCOを生成している。
そして、同図(a)に示される如く、前段酸化触媒28の軸線が上記導入ポート20に対し横向きに略直交して配置されており、DPF32は前段酸化触媒28の車両後側にて平行に配置されている。また、SCR触媒42はDPF32の下側に配置され、後段酸化触媒46はSCR触媒42の車両前側にSCR触媒42と平行に配置されている。
Next, the SCR catalyst 42 adsorbs the added NH 3 and purifies NOx in the exhaust gas using the NH 3 as a reducing agent. Further, the post-stage oxidation catalyst 46 oxidizes NH 3 that may be excessive in the SCR catalyst 42 to generate N 2 , and further oxidizes CO that may be generated by the combustion of PM by the DPF 32 to produce CO 2. 2 is generated.
As shown in FIG. 6A, the axis of the front oxidation catalyst 28 is disposed substantially orthogonal to the introduction port 20 in the lateral direction, and the DPF 32 is parallel to the rear side of the front oxidation catalyst 28 in the vehicle. Has been placed. The SCR catalyst 42 is disposed below the DPF 32, and the rear oxidation catalyst 46 is disposed in front of the SCR catalyst 42 in parallel with the SCR catalyst 42.
より具体的には、筐体18内は垂直壁22及び平行壁24によって略4等分に分割されている。この垂直壁(内壁)22は、トラック2の上下方向に延びて配置されており、前段酸化触媒28の入口側とDPF32の出口側とを遮断する一方、前段酸化触媒28の出口側とDPF32の入口側とは遮断しない長さに構成されている。また、この垂直壁22は、SCR触媒42の入口側と後段酸化触媒46の出口側とを遮断する一方、SCR触媒42の出口側と後段酸化触媒46の入口側とは遮断しない長さに構成されている。   More specifically, the inside of the housing 18 is divided into approximately four equal parts by the vertical wall 22 and the parallel wall 24. The vertical wall (inner wall) 22 is arranged extending in the vertical direction of the track 2 and blocks the inlet side of the front-stage oxidation catalyst 28 and the outlet side of the DPF 32, while the outlet side of the front-stage oxidation catalyst 28 and the DPF 32. It is configured to have a length that does not block the entrance side. The vertical wall 22 is configured to have a length that blocks the inlet side of the SCR catalyst 42 and the outlet side of the rear-stage oxidation catalyst 46, but does not block the outlet side of the SCR catalyst 42 and the inlet side of the rear-stage oxidation catalyst 46. Has been.
そして、図2のB−B線に沿う図3(b)に示されるように、前段酸化触媒28の入口側には導入ポート20に連通する入口側通路26が形成され、当該入口側通路26は垂直壁22及び遮蔽板(内壁)25によって区画されている。なお、後段酸化触媒46の出口側には下方向に向けて延びた導出ポート48が設けられており、この導出ポート48がテールパイプに接続されている。   As shown in FIG. 3B along the line BB in FIG. 2, an inlet side passage 26 communicating with the introduction port 20 is formed on the inlet side of the pre-stage oxidation catalyst 28, and the inlet side passage 26 Is partitioned by a vertical wall 22 and a shielding plate (inner wall) 25. A derivation port 48 extending downward is provided on the outlet side of the post-stage oxidation catalyst 46, and the derivation port 48 is connected to the tail pipe.
また、図2のC−C線に沿う図4(a)に示されるように、前段酸化触媒28の出口側とDPF32の入口側との間には連通路30が形成され、更に、SCR触媒42の出口側と後段酸化触媒46の入口側との間にも連通路44が形成されている。
これに対し、平行壁(内壁)24は、その法線方向がトラック2の高さ方向に向けて配置され、図3(b)や図4(a)に示されるように、前段酸化触媒28と後段酸化触媒46とを遮断するとともに、DPF32とSCR触媒42とを遮断し、更に、連通路30と連通路44とを遮断する長さに構成されている。
Further, as shown in FIG. 4A along line CC in FIG. 2, a communication passage 30 is formed between the outlet side of the pre-stage oxidation catalyst 28 and the inlet side of the DPF 32, and further, the SCR catalyst. A communication path 44 is also formed between the outlet side of 42 and the inlet side of the post-stage oxidation catalyst 46.
On the other hand, the parallel wall (inner wall) 24 is arranged so that the normal direction thereof is directed to the height direction of the track 2, and as shown in FIG. 3B and FIG. And the downstream oxidation catalyst 46, the DPF 32 and the SCR catalyst 42 are blocked, and the communication path 30 and the communication path 44 are blocked.
一方、上記遮蔽板25は、図2のD−D線に沿う図4(b)に示されるように、その法線方向がトラック2の幅方向に向けて配置されており、前段酸化触媒28の入口側と後段酸化触媒46の出口側とを覆うものの、DPF32の出口側とSCR触媒42の入口側とは覆わない長さに構成されている。なお、DPF32の出口側にはユリア水を添加する添加インジェクタ(添加手段)36が配設されている。この添加インジェクタ36はユリア水タンク16に接続され、その噴射口はDPF32の出口側通路34にてトラック2の前方向に向けて開口している。   On the other hand, as shown in FIG. 4B along the line D-D in FIG. 2, the shielding plate 25 is arranged with its normal direction facing the width direction of the track 2. However, the outlet side of the DPF 32 and the inlet side of the SCR catalyst 42 are not covered with each other. An addition injector (addition means) 36 for adding urea water is disposed on the outlet side of the DPF 32. The addition injector 36 is connected to the urea water tank 16, and its injection port opens toward the front side of the track 2 in the outlet side passage 34 of the DPF 32.
また、この出口側通路34とSCR触媒42の入口側通路40との間には迂回路形成板(迂回路形成部)35が配置されている。
具体的には、図2のE−E線に沿う図5(a)に示されるように、この迂回路形成板35は、トラック2の前方向に向けて配置されている。すなわち、迂回路形成板35は、添加インジェクタ36を備えた筐体18の面の内側部分から垂直壁22を超え、前段酸化触媒28及び後段酸化触媒46の各軸線を含む平面近傍の位置にまで達する長さに構成されている。これにより、出口側通路34と入口側通路40との間にはユリア水の迂回路38が形成される。
Further, a detour forming plate (detour forming unit) 35 is disposed between the outlet side passage 34 and the inlet side passage 40 of the SCR catalyst 42.
Specifically, as shown in FIG. 5A along the line EE in FIG. 2, the detour formation plate 35 is disposed toward the front direction of the track 2. That is, the detour formation plate 35 extends from the inner part of the surface of the housing 18 with the addition injector 36 to the position near the plane including the axes of the front-stage oxidation catalyst 28 and the rear-stage oxidation catalyst 46 from the vertical wall 22. It is configured to reach the length. Thereby, a detour 38 of urea water is formed between the outlet side passage 34 and the inlet side passage 40.
このように、本実施形態の排気浄化装置10においては、図5(b)に実線で示される如く、エンジン8からの排気は、導入ポート20から入口側通路26に達して前段酸化触媒28に導入され(図3)、連通路30を介してトラック2の前後方向に沿って移動してDPF32に導入される(図4)。次いで、添加インジェクタ36から排気中に添加されたユリア水は、出口側通路34、迂回路38及び入口側通路40の順にて逆コ字状に移動した後、SCR触媒42に導入される(図5(a))。続いて、図5(b)に破線で示される如く、SCR触媒42からの排気は連通路44を介してトラック2の前後方向に沿って移動して後段酸化触媒46に導入され(図4)、導出ポート48を介して筐体18内から排出される。   As described above, in the exhaust purification apparatus 10 of the present embodiment, as indicated by the solid line in FIG. 5B, the exhaust from the engine 8 reaches the inlet side passage 26 from the introduction port 20 and reaches the upstream oxidation catalyst 28. It is introduced (FIG. 3), moves along the front-rear direction of the track 2 through the communication path 30, and is introduced into the DPF 32 (FIG. 4). Next, urea water added to the exhaust gas from the addition injector 36 moves in an inverted U shape in the order of the outlet side passage 34, the detour path 38, and the inlet side passage 40, and is then introduced into the SCR catalyst 42 (FIG. 5 (a)). Subsequently, as indicated by a broken line in FIG. 5B, the exhaust gas from the SCR catalyst 42 moves along the front-rear direction of the track 2 through the communication path 44 and is introduced into the rear-stage oxidation catalyst 46 (FIG. 4). Then, the air is discharged from the housing 18 through the outlet port 48.
以上のように、本実施形態では、前段酸化触媒28、DPF32、SCR触媒42及び後段酸化触媒46が束ねられて筐体18内に収納されているのである。よって、従来に比して筐体の表面積の最小化が図られる結果、排気浄化装置の製造コストの削減も図られるし、排気浄化装置の重量が軽減され、トラック2を始めとする各種の車両への搭載性が向上する。また、筐体18内の保温性が良好となることから、上記排気浄化手段の活性が促進されて浄化率の向上に寄与する。   As described above, in the present embodiment, the front-stage oxidation catalyst 28, the DPF 32, the SCR catalyst 42, and the rear-stage oxidation catalyst 46 are bundled and housed in the housing 18. Therefore, as a result of minimizing the surface area of the housing as compared with the conventional case, the manufacturing cost of the exhaust purification device can be reduced, the weight of the exhaust purification device can be reduced, and various vehicles including the truck 2 can be achieved. Improves mounting capability. Moreover, since the heat retaining property in the housing 18 is improved, the activity of the exhaust gas purifying means is promoted and contributes to the improvement of the purification rate.
また、DPF32の出口側とSCR触媒42の入口側との間には迂回路形成板35が設けられており、添加インジェクタ36からのユリア水は、DPF32の軸線及びSCR触媒42の軸線を含む平面に沿って最短距離でSCR触媒42内に導入されるのではなく、車体フレーム6から視て逆コ字状、つまり、前段酸化触媒28の軸線及び後段酸化触媒46の軸線を含む平面側を経てからSCR触媒42内に導入されている。従って、ユリア水の長い移動経路が確保され、ユリア水が排気中に均一に拡散され易くなり、NOx浄化率がより一層向上する。   Further, a bypass forming plate 35 is provided between the outlet side of the DPF 32 and the inlet side of the SCR catalyst 42, and urea water from the addition injector 36 is a plane including the axis line of the DPF 32 and the axis line of the SCR catalyst 42. Is not introduced into the SCR catalyst 42 at the shortest distance along the vertical axis, but is inverted U-shaped when viewed from the vehicle body frame 6, that is, through the plane side including the axis of the front-stage oxidation catalyst 28 and the axis of the rear-stage oxidation catalyst 46. To the SCR catalyst 42. Therefore, a long movement path of urea water is secured, and urea water is easily diffused uniformly in the exhaust gas, and the NOx purification rate is further improved.
更にまた、後段酸化触媒46がDPF32やSCR触媒42よりもキャブ4寄り(車両前側)に位置しており、排気導出ポート48も車両前側に位置できるので排気浄化装置10の後方のスペース、例えばスペアタイヤやエアタンク等の後方架装物との距離が遠くなり、これら架装物に対する熱害が回避される。
以上で本発明の一実施形態についての説明を終えるが、本発明は上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更ができるものである。
Furthermore, since the rear-stage oxidation catalyst 46 is located closer to the cab 4 (vehicle front side) than the DPF 32 and the SCR catalyst 42, and the exhaust outlet port 48 can also be located on the vehicle front side, a space behind the exhaust purification device 10, for example, a spare The distance from the rear structure such as a tire or an air tank is increased, and thermal damage to the structure is avoided.
The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
例えば、上記実施形態では、前段酸化触媒28がキャブ4の後面近傍に配置されているが、必ずしもこの形態に限定されるものではなく、図6に示される排気浄化装置50であっても良い(第2実施形態)。
詳しくは、当該排気浄化装置50では、上述した導入ポート20よりも低い位置に導入ポート70が設けられている。そして、図6のA−A線に沿う図7(a)に示される如く、前段酸化触媒28が上記導入ポート70に対し横向きに配置されており、DPF32は前段酸化触媒28の軸線の上側にて平行に配置され、SCR触媒42はDPF32の車両前側にて平行に配置されている。更に、図6のC−C線に沿う図8(a)に示される如く、後段酸化触媒46はSCR触媒42の下側であって前段酸化触媒28の車両前側に前段酸化触媒28と平行に配置されている。
For example, in the above embodiment, the front-stage oxidation catalyst 28 is disposed in the vicinity of the rear surface of the cab 4, but the present invention is not necessarily limited to this form, and the exhaust purification device 50 shown in FIG. Second embodiment).
Specifically, in the exhaust purification device 50, the introduction port 70 is provided at a position lower than the introduction port 20 described above. As shown in FIG. 7A along the line AA in FIG. 6, the front-stage oxidation catalyst 28 is disposed laterally with respect to the introduction port 70, and the DPF 32 is located above the axis of the front-stage oxidation catalyst 28. The SCR catalyst 42 is arranged in parallel on the vehicle front side of the DPF 32. Further, as shown in FIG. 8A along the line C-C in FIG. 6, the rear-stage oxidation catalyst 46 is below the SCR catalyst 42 and in front of the front-stage oxidation catalyst 28 in parallel with the front-stage oxidation catalyst 28. Has been placed.
また、排気浄化装置50では、筐体18内は垂直壁52及び平行壁54の内壁によって略4等分に分割され、この平行壁54は、前段酸化触媒28の入口側とDPF32の出口側とを遮断する一方、前段酸化触媒28の出口側とDPF32の入口側とは遮断しない長さに構成されている(図7(a)、図8(a))。また、平行壁54は、SCR触媒42の出口側と後段酸化触媒46の入口側とも遮断しない長さに構成されている。そして、前段酸化触媒28の入口側には導入ポート70に連通する入口側通路26が形成され(図7(a))、当該入口側通路26は平行壁54及び遮蔽板75、96によって区画されている(図6のB−B線に沿う図7(b)、図6のE−E線に沿う図9(a))。更に、前段酸化触媒28の出口側とDPF32の入口側との間には連通路80が形成され、SCR触媒42の出口側と後段酸化触媒46の入口側との間にも連通路94が形成されている。これに対し、垂直壁52は、DPF32とSCR触媒42とを遮断し、更に、連通路80と連通路94とを遮断する長さに構成されている(図7(a)、図8(a))。   Further, in the exhaust purification device 50, the inside of the housing 18 is divided into approximately four equal parts by the inner walls of the vertical wall 52 and the parallel wall 54. The outlet side of the pre-stage oxidation catalyst 28 and the inlet side of the DPF 32 are configured to be not cut off (FIGS. 7A and 8A). Further, the parallel wall 54 has a length that does not block both the outlet side of the SCR catalyst 42 and the inlet side of the post-stage oxidation catalyst 46. An inlet side passage 26 communicating with the introduction port 70 is formed on the inlet side of the pre-stage oxidation catalyst 28 (FIG. 7A), and the inlet side passage 26 is partitioned by the parallel wall 54 and the shielding plates 75 and 96. (FIG. 7B along the BB line in FIG. 6 and FIG. 9A along the EE line in FIG. 6). Further, a communication path 80 is formed between the outlet side of the front-stage oxidation catalyst 28 and the inlet side of the DPF 32, and a communication path 94 is also formed between the outlet side of the SCR catalyst 42 and the inlet side of the rear-stage oxidation catalyst 46. Has been. In contrast, the vertical wall 52 is configured to have a length that blocks the DPF 32 and the SCR catalyst 42 and further blocks the communication path 80 and the communication path 94 (FIGS. 7A and 8A). )).
一方、上記遮蔽板75、96は、その法線方向がトラック2の上下方向に立って配置されており、遮蔽板75は、前段酸化触媒28の入口側と後段酸化触媒46の出口側とを覆う長さに構成されている(図7(b)、図9(a))。これに対し、遮蔽板96は、遮蔽板75よりも内側に配置され、後段酸化触媒46の出口側を覆うものの、前段酸化触媒28の入口側を覆わない長さに構成されている。   On the other hand, the shielding plates 75 and 96 are arranged such that the normal direction thereof stands in the vertical direction of the track 2, and the shielding plate 75 has an inlet side of the front-stage oxidation catalyst 28 and an outlet side of the rear-stage oxidation catalyst 46. It is configured to cover the length (FIGS. 7B and 9A). On the other hand, the shielding plate 96 is arranged on the inner side of the shielding plate 75 and has a length that covers the outlet side of the rear-stage oxidation catalyst 46 but does not cover the inlet side of the front-stage oxidation catalyst 28.
そして、DPF32の出口側通路84とSCR触媒42の入口側通路90との間には迂回路形成板(迂回路形成部)85が配置されている。図8(b)に示されるように、迂回路形成板85は、導出ポート48を備えた筐体18の面とは反対側の面の内側部分からトラック2の高さ方向に沿って延びて平行壁54を超え、遮蔽板75の向こう側に配置された前段酸化触媒28及び後段酸化触媒46の各軸線を含む平面近傍の位置にまで達する長さに構成されている。これにより、出口側通路84と入口側通路90との間にはユリア水の迂回路88が形成される。   A detour forming plate (detour forming unit) 85 is disposed between the outlet side passage 84 of the DPF 32 and the inlet side passage 90 of the SCR catalyst 42. As shown in FIG. 8B, the detour formation plate 85 extends along the height direction of the track 2 from the inner portion of the surface opposite to the surface of the housing 18 provided with the outlet port 48. The length is such that it extends beyond the parallel wall 54 and reaches a position near the plane including the axes of the front-stage oxidation catalyst 28 and the rear-stage oxidation catalyst 46 disposed on the other side of the shielding plate 75. Thereby, a detour 88 of urea water is formed between the outlet side passage 84 and the inlet side passage 90.
このように、本実施形態の排気浄化装置50においては、図9(b)に実線で示される如く、エンジン8からの排気は、導入ポート70から入口側通路26に達して前段酸化触媒28に導入され(図7)、連通路80を介してトラック2の上下方向に沿って移動してDPF32に導入される(図7(b)、図8(a))。次いで、添加インジェクタ36から排気中に添加されたユリア水は、出口側通路84、迂回路88及び入口側通路90の順にて本体フレーム6から視てU字状に移動した後、SCR触媒42に導入される(図8(b))。続いて、SCR触媒42からの排気は連通路94を介してトラック2の上下方向に沿って移動して後段酸化触媒46に導入され(図9(a))、導出ポート48を介して筐体18内から排出される。   As described above, in the exhaust purification device 50 of the present embodiment, as indicated by the solid line in FIG. 9B, the exhaust from the engine 8 reaches the inlet side passage 26 from the introduction port 70 and reaches the upstream oxidation catalyst 28. It is introduced (FIG. 7), moved along the vertical direction of the track 2 via the communication path 80, and introduced into the DPF 32 (FIGS. 7B and 8A). Next, urea water added to the exhaust gas from the addition injector 36 moves in a U shape as viewed from the main body frame 6 in the order of the outlet side passage 84, the detour 88 and the inlet side passage 90, and then enters the SCR catalyst 42. It is introduced (FIG. 8 (b)). Subsequently, the exhaust gas from the SCR catalyst 42 moves along the vertical direction of the track 2 via the communication path 94 and is introduced into the rear-stage oxidation catalyst 46 (FIG. 9A). 18 is discharged from the inside.
従って、本実施形態によれば、エンジン8側の制約等によって導入ポート70を低い位置に設けたい場合にも対応可能となり、この場合にも、後段酸化触媒46がDPF32や前段酸化触媒28よりも前方に位置し、導出ポート48も車両前側に位置できるので、後方架装物に対する熱害が回避可能となる。
ところで、上記各実施形態では、4つの排気浄化手段の各軸線がトラック2の幅方向に沿って並列に配置されているが、4つの排気浄化手段の各軸線がトラック2の前後方向に沿って並列に配置されていても良い。また、立方体の筐体において、各外周面の中点を結んだ垂直壁や平行壁によって筐体内を区画する他、対向する角を結んで互いに直交する壁によって筐体内を区画しても良い。そして、これらの場合にも、車両への搭載性及び筐体内の保温性の向上を図ることができるとの効果を奏する。
Therefore, according to the present embodiment, it is possible to cope with the case where the introduction port 70 is desired to be provided at a low position due to restrictions on the engine 8 side. Since it is located in the front and the lead-out port 48 can also be located on the front side of the vehicle, it is possible to avoid heat damage to the rear body.
By the way, in each of the above-described embodiments, the axes of the four exhaust purification means are arranged in parallel along the width direction of the track 2, but the axes of the four exhaust purification means extend along the front-rear direction of the track 2. You may arrange | position in parallel. Further, in the cubic housing, the inside of the housing may be partitioned by vertical walls or parallel walls connecting the midpoints of the respective outer peripheral surfaces, or may be partitioned by walls orthogonal to each other by connecting opposite corners. And also in these cases, there exists an effect that the mounting property to a vehicle and the heat retention in a housing | casing can be aimed at.
更に、上記各実施形態では、ディーゼルエンジンに適用された排気浄化装置について説明されているが、当該エンジンに限定されるものではなく、本発明は、DPFとSCR触媒とを備えた総てのエンジンに適用可能である。   Furthermore, in each said embodiment, although the exhaust gas purification apparatus applied to the diesel engine is demonstrated, it is not limited to the said engine, This invention is all engines provided with DPF and SCR catalyst. It is applicable to.
本発明の一実施形態に係る内燃機関の排気浄化装置を搭載した車両の概略図である。1 is a schematic view of a vehicle equipped with an exhaust gas purification apparatus for an internal combustion engine according to an embodiment of the present invention. 図1の排気浄化装置の外観斜視図である。It is an external appearance perspective view of the exhaust gas purification apparatus of FIG. 図2のA−A線及びB−B線に沿う矢視断面図である。It is arrow sectional drawing which follows the AA line and BB line of FIG. 図2のC−C線及びD−D線に沿う矢視断面図である。It is arrow sectional drawing which follows the CC line and DD line of FIG. 図2のE−E線に沿う矢視断面図、並びに排気流れの説明図である。FIG. 3 is a cross-sectional view taken along line EE in FIG. 2 and an explanatory diagram of an exhaust flow. 他の実施形態による排気浄化装置の外観斜視図である。It is an external appearance perspective view of the exhaust gas purification apparatus by other embodiment. 図6のA−A線及びB−B線に沿う矢視断面図である。It is arrow sectional drawing which follows the AA line and BB line of FIG. 図6のC−C線及びD−D線に沿う矢視断面図である。It is arrow sectional drawing along the CC line and DD line of FIG. 図6のE−E線に沿う矢視断面図、並びに排気流れの説明図である。It is arrow sectional drawing along the EE line | wire of FIG. 6, and explanatory drawing of an exhaust flow.
符号の説明Explanation of symbols
8 内燃機関
10,50 排気浄化装置
18 筐体
28 前段酸化触媒
32 DPF(パティキュレートフィルタ)
35,85 迂回路形成板(迂回路形成部)
36 添加インジェクタ(添加手段)
42 SCR触媒(選択還元型NOx触媒)
46 後段酸化触媒
8 Internal combustion engine 10, 50 Exhaust gas purification device 18 Case 28 Pre-stage oxidation catalyst 32 DPF (particulate filter)
35,85 detour formation plate (detour formation section)
36 Additive injector (additive means)
42 SCR catalyst (selective reduction NOx catalyst)
46 Second-stage oxidation catalyst

Claims (3)

  1. 内燃機関からの排気が導入される筐体と、
    前記筐体の内部を格子状に4つの室に区切るとともに前記内燃機関からの排気が前記4つの各室を順次流れるように配設された内壁とを備え、
    前記筐体内における排気流れの上流側に位置する室から順に、前段酸化触媒、パティキュレートフィルタ、ユリア水の添加によって排気中のNOxを浄化する選択還元型NOx触媒、および後段酸化触媒が収納されていることを特徴とする内燃機関の排気浄化装置。
    A housing into which exhaust from the internal combustion engine is introduced;
    The interior of the housing is divided into four chambers in a lattice shape and includes an inner wall disposed so that exhaust from the internal combustion engine flows through the four chambers sequentially,
    In order from the chamber located upstream of the exhaust flow in the casing, a pre-stage oxidation catalyst, a particulate filter, a selective reduction type NOx catalyst that purifies NOx in exhaust gas by adding urea water, and a post-stage oxidation catalyst are housed. An exhaust emission control device for an internal combustion engine.
  2. 前記筐体は、前記パティキュレートフィルタの出口近傍位置にて前記ユリア水を添加する添加手段と、前記パティキュレートフィルタから排出された排気が隣り合う前記選択還元型NOx触媒に流れる際に前記前段酸化触媒の軸線および前記後段酸化触媒の軸線を含む平面近傍の位置まで迂回させる迂回路形成部とを備えていることを特徴とする請求項1に記載の内燃機関の排気浄化装置。   The casing includes the addition means for adding the urea water at a position near the outlet of the particulate filter, and the pre-oxidation when exhaust discharged from the particulate filter flows to the adjacent selective reduction type NOx catalyst. 2. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, further comprising: a detour forming unit configured to detour to a position near a plane including the axis of the catalyst and the axis of the second-stage oxidation catalyst.
  3. 前記筐体内に前段酸化触媒、パティキュレートフィルタ、選択還元型NOx触媒、および後段酸化触媒の排気流れ方向が車両前後方向に対して略直交方向となるように各々配置され、前記後段酸化触媒が前記筐体の区切られた室のうちの車両前側で且つ下段に位置する室に配置されたことを特徴とする請求項1又は2に記載の内燃機関の排気浄化装置。   The front-stage oxidation catalyst, the particulate filter, the selective reduction type NOx catalyst, and the rear-stage oxidation catalyst are arranged in the casing so that the exhaust flow directions thereof are substantially perpendicular to the vehicle front-rear direction. The exhaust gas purification apparatus for an internal combustion engine according to claim 1 or 2, wherein the exhaust gas purification apparatus for an internal combustion engine according to claim 1 or 2, wherein the exhaust gas purification apparatus is disposed in a chamber located on a front side of the vehicle and in a lower stage among the chambers defined by the casing.
JP2005224040A 2005-08-02 2005-08-02 Exhaust emission control device of internal combustion engine Withdrawn JP2007040149A (en)

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