JP2011001875A - Exhaust emission control device - Google Patents

Exhaust emission control device Download PDF

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JP2011001875A
JP2011001875A JP2009145294A JP2009145294A JP2011001875A JP 2011001875 A JP2011001875 A JP 2011001875A JP 2009145294 A JP2009145294 A JP 2009145294A JP 2009145294 A JP2009145294 A JP 2009145294A JP 2011001875 A JP2011001875 A JP 2011001875A
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dpf
exhaust gas
exhaust
urea
catalyst
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Yoshihisa Tashiro
欣久 田代
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Isuzu Motors Ltd
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    • 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
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/12—Improving ICE efficiencies

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  • Filtering Of Dispersed Particles In Gases (AREA)
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Abstract

PROBLEM TO BE SOLVED: To provide a compact and inexpensive exhaust emission control device.SOLUTION: The exhaust emission control device 1 includes: a DPF (diesel particulate filter) 3 provided in an exhaust pipe 2 through which exhaust gas from a diesel engine flows; an oxidation catalyst 4 provided in the exhaust pipe 2 upstream of the DPF 3; and a gas oil injection device 5 connected to the exhaust pipe 2 upstream of the oxidation catalyst 4. The DPF 3 includes a porous DPF carrier 8 allowing exhaust gas to pass through; a urea decomposition catalyst 10 carried on an exhaust gas inlet side wall 9 of the DPF carrier 8; and a urea SCR catalyst 11 carried on the exhaust gas outlet side wall 9 of the DPF carrier 8. A urea injection device 6 injecting urea into exhaust gas is connected to the exhaust pipe 2 downstream of the oxidation catalyst 4 and upstream of the DPF 3.

Description

本発明は、ディーゼルエンジンから排出される排ガスを浄化する排気浄化装置に関するものである。   The present invention relates to an exhaust purification device that purifies exhaust gas discharged from a diesel engine.

ＰＭ（Ｐａｒｔｉｃｕｌａｔｅ Ｍａｔｔｅｒ：粒子状物質）及びＮＯｘの排ガス規制強化に伴い、ＰＭ及びＮＯｘを低減する排気浄化装置が必要となっている。ＰＭ低減のための代表的な装置としてはＤＰＦ（ディーゼル・パティキュレート・フィルター）、ＮＯｘ低減のための代表的な装置としては尿素ＳＣＲ触媒装置が挙げられる。図３に示すように、ＰＭ及びＮＯｘの両方を低減する代表的な排気浄化装置２０としては、前側（エンジン側）にＤＰＦ装置（ＤＯＣ２２＋ＤＰＦ２３）２１を装着し、その後方（大気側）に尿素ＳＣＲ触媒装置２４を装着するものが一般的である。この排気浄化装置２０は、ＤＰＦ２３の強制再生のため、ＤＰＦ２３の前方に軽油噴射装置（排気管噴射又はポスト噴射）を有する。また、尿素ＳＣＲ触媒２５の還元剤として尿素を供給するため、ＤＰＦ２３と尿素ＳＣＲ触媒装置２４の間に尿素噴射装置の噴射ノズルを装着する必要がある。尿素水をＤＰＦ２３の前方で噴射した場合、ＤＰＦ２３及びＤＯＣ２２に担持された貴金属により尿素より分解されたＮＨ3はＮＯｘに転換され、還元剤としての機能を有しない事になる。したがって、ＤＰＦ２３の後方かつ尿素ＳＣＲ触媒装置２４の前方に尿素噴射ノズルを装着する必要があるが、ノズル位置は、尿素の分解に時間が必要なため、尿素ＳＣＲ触媒装置２４より距離を長く取るか、図４に示すように、尿素分解触媒２６を尿素ＳＣＲ触媒装置２４の前方に置く必要があった。 As PM (Particulate Matter) and NOx exhaust gas regulations are strengthened, an exhaust purification device that reduces PM and NOx is required. A typical device for reducing PM includes a DPF (diesel particulate filter), and a typical device for reducing NOx includes a urea SCR catalyst device. As shown in FIG. 3, as a typical exhaust purification device 20 that reduces both PM and NOx, a DPF device (DOC22 + DPF23) 21 is mounted on the front side (engine side), and urea SCR is mounted on the rear side (atmosphere side). A device equipped with a catalyst device 24 is generally used. This exhaust purification device 20 has a light oil injection device (exhaust pipe injection or post injection) in front of the DPF 23 for forced regeneration of the DPF 23. Further, in order to supply urea as a reducing agent for the urea SCR catalyst 25, it is necessary to mount an injection nozzle of the urea injection device between the DPF 23 and the urea SCR catalyst device 24. When urea water is injected in front of the DPF 23, NH 3 decomposed from urea by the noble metal supported on the DPF 23 and the DOC 22 is converted to NOx and does not have a function as a reducing agent. Therefore, it is necessary to install a urea injection nozzle behind the DPF 23 and in front of the urea SCR catalyst device 24. However, because the nozzle position requires time for decomposition of urea, is the distance longer than the urea SCR catalyst device 24 taken? As shown in FIG. 4, it is necessary to place the urea decomposition catalyst 26 in front of the urea SCR catalyst device 24.

特開２００９−１３９３２号公報JP 2009-13932 A 特開２００９−３６１０９号公報JP 2009-36109 A 特開２００９−３６０４１号公報JP 2009-36041 A

このため、現状の排気浄化装置２０、２７は、図３又は図４に示す如く、それぞれの機能を持つ装置２１、２４を装着し、その装置２１、２４に必要な噴射装置を装着する必要があり、システムは複雑で大きな容量を必要として、レイアウト上及びコスト上の課題を有していた。   For this reason, as shown in FIG. 3 or FIG. 4, the current exhaust purification devices 20 and 27 need to be equipped with devices 21 and 24 having the respective functions, and the devices 21 and 24 need to be equipped with necessary injection devices. In addition, the system is complicated and requires a large capacity, and has layout and cost problems.

そこで、本発明の目的は、上記課題を解決し、コンパクトかつ安価な排気浄化装置を提供することにある。   Accordingly, an object of the present invention is to solve the above-described problems and provide a compact and inexpensive exhaust purification device.

上記課題を解決するために本発明は、ディーゼルエンジンからの排ガスを流す排気管に設けられたＤＰＦと、該ＤＰＦより上流の上記排気管に設けられた酸化触媒と、該酸化触媒より上流の上記排気管に接続され上記ＤＰＦを強制再生するとき排ガス中に軽油を噴射する軽油噴射装置とを備えた排気浄化装置において、上記ＤＰＦが、排ガスを通過させる多孔質のＤＰＦ担体と、該ＤＰＦ担体の排ガス入口側の壁に担持された尿素分解触媒と、上記ＤＰＦ担体の排ガス出口側の壁に担持された尿素ＳＣＲ触媒とからなり、上記酸化触媒より下流かつ上記ＤＰＦより上流の上記排気管に排ガス中に尿素を噴射する尿素噴射装置を接続したものである。   In order to solve the above problems, the present invention provides a DPF provided in an exhaust pipe for flowing exhaust gas from a diesel engine, an oxidation catalyst provided in the exhaust pipe upstream of the DPF, and the upstream of the oxidation catalyst. An exhaust gas purification apparatus comprising a light oil injection device that is connected to an exhaust pipe and injects light oil into exhaust gas when the DPF is forcibly regenerated, wherein the DPF includes a porous DPF carrier through which the exhaust gas passes, and the DPF carrier The urea decomposition catalyst supported on the wall on the exhaust gas inlet side and the urea SCR catalyst supported on the wall on the exhaust gas outlet side of the DPF carrier, and the exhaust gas in the exhaust pipe downstream from the oxidation catalyst and upstream from the DPF A urea injection device for injecting urea is connected to the inside.

上記ＤＰＦ担体が、上記排気管の軸方向に延びる複数の穴を有する格子状に形成されると共に、互いに隣接する穴の上流端と下流端が交互に目封じされ、上記穴間のＤＰＦ担体に上記壁が形成されている。   The DPF carrier is formed in a lattice shape having a plurality of holes extending in the axial direction of the exhaust pipe, and the upstream end and the downstream end of adjacent holes are alternately sealed, and the DPF carrier between the holes The wall is formed.

上記ＤＰＦより下流の排気管に酸化触媒を設けている。   An oxidation catalyst is provided in the exhaust pipe downstream from the DPF.

排気浄化装置をコンパクトかつ安価にできる。   The exhaust emission control device can be made compact and inexpensive.

図１は本実施の形態の排気浄化装置の断面説明図である。FIG. 1 is an explanatory cross-sectional view of the exhaust purification apparatus of the present embodiment. 図２は図１の要部拡大図である。FIG. 2 is an enlarged view of a main part of FIG. 図３は従来の排気浄化装置の断面説明図である。FIG. 3 is a cross-sectional explanatory view of a conventional exhaust purification device. 図４は従来の排気浄化装置の断面説明図である。FIG. 4 is a cross-sectional explanatory view of a conventional exhaust purification device.

図１に示すように、排気浄化装置１は、ディーゼルエンジン（図示せず）からの排ガス１７を流す排気管２に設けられ尿素分解機能と尿素ＳＣＲ機能を有するＤＰＦ３と、ＤＰＦ３より上流の排気管２に設けられた第１酸化触媒４と、第１酸化触媒４より上流の排気管２に接続されＤＰＦ３を強制再生するとき排ガス中に軽油を噴射する軽油噴射装置５と、第１酸化触媒４より下流かつＤＰＦ３より上流の排気管２に接続され排ガス中に尿素を噴射する尿素噴射装置６と、ＤＰＦ３より下流の排気管２に設けられた第２酸化触媒７とを備える。   As shown in FIG. 1, an exhaust purification device 1 includes a DPF 3 having a urea decomposition function and a urea SCR function provided in an exhaust pipe 2 through which exhaust gas 17 from a diesel engine (not shown) flows, and an exhaust pipe upstream of the DPF 3. 2, a first oil catalyst 4 that is connected to the exhaust pipe 2 upstream of the first oxidation catalyst 4 and that injects light oil into the exhaust gas when the DPF 3 is forcibly regenerated, and a first oxidation catalyst 4. A urea injection device 6 that is connected to the exhaust pipe 2 further downstream and upstream from the DPF 3 and injects urea into the exhaust gas, and a second oxidation catalyst 7 provided in the exhaust pipe 2 downstream from the DPF 3 are provided.

図２に示すように、ＤＰＦ３は、排ガスを通過させる多孔質のＤＰＦ担体８と、ＤＰＦ担体８の排ガス入口側の壁９に担持された尿素分解触媒１０と、ＤＰＦ担体８の排ガス出口側の壁９に担持された尿素ＳＣＲ触媒１１とからなる。ＤＰＦ担体８は、ウォールスルータイプであり、排気管２の軸方向に延びる複数の穴１２を有する格子状に形成されると共に、互いに隣接する穴１２の上流端と下流端が交互に目封じされ、これら穴１２間のＤＰＦ担体８に排ガスを通過させる壁９が形成されている。また、ＤＰＦ担体８は、貴金属触媒等酸化能力を有する触媒を担持しない。一般にＤＰＦ担体８に酸化能力のある貴金属触媒を担持させることによりＰＭが燃え始める温度を６００℃から４００℃位に下げることができ、排気温度が４００℃を越えたときＤＰＦ３が自然と再生されるようにできるが、実際の運転では排気温度が４００℃を越える機会は極めて少ない。このため、ＤＰＦ担体８に酸化能力を有する触媒を担持させるのを止め、軽油噴射装置５から排ガス中に軽油を噴射することでハイドロカーボンを発生させ、このハイドロカーボンを第１酸化触媒４で酸化させることにより酸化熱を発生させ、ＤＰＦ３を強制再生するように排気浄化装置１を構成した。   As shown in FIG. 2, the DPF 3 includes a porous DPF carrier 8 through which exhaust gas passes, a urea decomposition catalyst 10 supported on the wall 9 on the exhaust gas inlet side of the DPF carrier 8, and an exhaust gas outlet side of the DPF carrier 8. It consists of a urea SCR catalyst 11 supported on the wall 9. The DPF carrier 8 is a wall-through type, is formed in a lattice shape having a plurality of holes 12 extending in the axial direction of the exhaust pipe 2, and the upstream end and the downstream end of the adjacent holes 12 are alternately plugged. A wall 9 that allows exhaust gas to pass through the DPF carrier 8 between the holes 12 is formed. Further, the DPF carrier 8 does not carry a catalyst having oxidation ability such as a noble metal catalyst. In general, by supporting a noble metal catalyst capable of oxidation on the DPF carrier 8, the temperature at which PM starts to burn can be lowered from about 600 ° C. to about 400 ° C., and when the exhaust temperature exceeds 400 ° C., the DPF 3 is naturally regenerated. However, there are very few opportunities for the exhaust temperature to exceed 400 ° C. in actual operation. For this reason, the DPF carrier 8 is stopped from supporting a catalyst having an oxidizing ability, and light oil is injected into the exhaust gas from the light oil injection device 5 to generate hydrocarbons. The hydrocarbons are oxidized by the first oxidation catalyst 4. Thus, the exhaust gas purification apparatus 1 is configured to generate oxidation heat to forcibly regenerate the DPF 3.

尿素分解触媒１０は、Ａｌ2Ｏ3、ＳｉＯ2又はＺｒＯ2等からなり、尿素をアンモニアと二酸化炭素に分解する機能を有する。 The urea decomposition catalyst 10 is made of Al 2 O 3 , SiO 2, ZrO 2 or the like, and has a function of decomposing urea into ammonia and carbon dioxide.

尿素ＳＣＲ触媒１１はゼオライトからなるＮＯｘ還元触媒である。   The urea SCR catalyst 11 is a NOx reduction catalyst made of zeolite.

図１に示す第１酸化触媒４と第２酸化触媒７は、ディーゼル用酸化触媒（ＤＯＣ：Ｄｉｅｓｅｌ Ｏｘｉｄａｔｉｏｎ Ｃａｔａｌｙｓｔ）からなる。第１酸化触媒４は排ガス中の一酸化炭素、炭化水素を酸化反応により酸化除去する。また、第１酸化触媒４は、一酸化炭素、炭化水素を酸化除去するとき酸化熱を発生する。この酸化熱はＤＰＦ３を強制再生するとき用いられる。第２酸化触媒７は、アンモニアのリークを防ぐためのものであり、アンモニアを酸化する機能を有する。   The 1st oxidation catalyst 4 and the 2nd oxidation catalyst 7 which are shown in FIG. 1 consist of a diesel oxidation catalyst (DOC: Diesel Oxidation Catalyst). The first oxidation catalyst 4 oxidizes and removes carbon monoxide and hydrocarbons in the exhaust gas by an oxidation reaction. The first oxidation catalyst 4 generates oxidation heat when oxidizing and removing carbon monoxide and hydrocarbons. This heat of oxidation is used when the DPF 3 is forcibly regenerated. The second oxidation catalyst 7 is for preventing leakage of ammonia and has a function of oxidizing ammonia.

軽油噴射装置５は、第１酸化触媒４より上流の排気管２に接続された軽油噴射ノズル１３と、軽油噴射ノズル１３に軽油を供給する軽油供給部１４とを備える。   The light oil injection device 5 includes a light oil injection nozzle 13 connected to the exhaust pipe 2 upstream from the first oxidation catalyst 4, and a light oil supply unit 14 that supplies light oil to the light oil injection nozzle 13.

尿素噴射装置６は、第１酸化触媒４より下流かつＤＰＦ３より上流の排気管２に接続された尿素噴射ノズル１５と、尿素噴射ノズル１５に尿素水を供給する尿素供給部１６とを備える。   The urea injection device 6 includes a urea injection nozzle 15 connected to the exhaust pipe 2 downstream from the first oxidation catalyst 4 and upstream from the DPF 3, and a urea supply unit 16 that supplies urea water to the urea injection nozzle 15.

次に本実施の形態の作用を述べる。   Next, the operation of this embodiment will be described.

排気浄化装置１に流入した排ガスは、まず第１酸化触媒４を通り、排ガス中の一酸化炭素と炭化水素が酸化除去される。   The exhaust gas that has flowed into the exhaust purification device 1 first passes through the first oxidation catalyst 4, and carbon monoxide and hydrocarbons in the exhaust gas are oxidized and removed.

この後、尿素噴射装置６から排ガス中に尿素が噴射されると、尿素は排ガスと共にＤＰＦ３内に入る。排ガスがＤＰＦ担体８の壁９を通過するとき排ガス中のＰＭは壁９に捕捉される。また、排ガス中の尿素は、ＤＰＦ担体８の排ガス入口側の壁９を通過するとき、尿素分解触媒１０によりＣＯ（ＮＨ2）2→ＮＨ3＋ＣＯ2に分解される。またさらに、排ガス中のＮＯｘは、壁９の出口側の尿素ＳＣＲ触媒１１を通過するとき、ＮＨ3（アンモニア）により還元され、Ｎ2に無害化される。ＤＰＦ３を通過した排ガスは第２酸化触媒７に入り、排ガス中にアンモニアが残っている場合、アンモニアを酸化させて無害化する。 Thereafter, when urea is injected into the exhaust gas from the urea injection device 6, the urea enters the DPF 3 together with the exhaust gas. When the exhaust gas passes through the wall 9 of the DPF carrier 8, PM in the exhaust gas is captured by the wall 9. Further, urea in the exhaust gas is decomposed into CO (NH 2 ) 2 → NH 3 + CO 2 by the urea decomposition catalyst 10 when passing through the wall 9 on the exhaust gas inlet side of the DPF carrier 8. Furthermore, NOx in the exhaust gas is reduced by NH 3 (ammonia) and made harmless by N 2 when passing through the urea SCR catalyst 11 on the outlet side of the wall 9. The exhaust gas that has passed through the DPF 3 enters the second oxidation catalyst 7, and when ammonia remains in the exhaust gas, the ammonia is oxidized and rendered harmless.

ＤＰＦ３を強制再生するとき、軽油噴射装置５から排ガス中に軽油を噴射する。これにより排ガス中にハイドロカーボンが大量に発生し、ハイドロカーボンが第１酸化触媒４で燃焼し、ＤＰＦ３が６００℃以上の高温となり、ＰＭが燃焼する。このとき、尿素分解触媒１０と尿素ＳＣＲ触媒１１が熱によって変質、破損等することはなく、ＤＰＦ３の強制再生等の弊害とならない。   When the DPF 3 is forcibly regenerated, light oil is injected from the light oil injection device 5 into the exhaust gas. As a result, a large amount of hydrocarbon is generated in the exhaust gas, the hydrocarbon burns in the first oxidation catalyst 4, the DPF 3 reaches a high temperature of 600 ° C. or higher, and PM burns. At this time, the urea decomposition catalyst 10 and the urea SCR catalyst 11 are not altered or damaged by heat, and there is no adverse effect such as forced regeneration of the DPF 3.

このように、ディーゼルエンジンからの排ガスを流す排気管２に設けられたＤＰＦ３と、ＤＰＦ３より上流の排気管２に設けられた第１酸化触媒４と、第１酸化触媒４より上流の排気管２に接続されＤＰＦ３を強制再生するとき排ガス中に軽油を噴射する軽油噴射装置５とを備えた排気浄化装置１において、ＤＰＦ３が、排ガスを通過させる多孔質のＤＰＦ担体８と、ＤＰＦ担体８の排ガス入口側の壁９に担持された尿素分解触媒１０と、ＤＰＦ担体８の排ガス出口側の壁９に担持された尿素ＳＣＲ触媒１１とからなり、第１酸化触媒４より下流かつＤＰＦ３より上流の排気管２に排ガス中に尿素を噴射する尿素噴射装置６を接続したため、排気浄化装置１をコンパクトかつ安価なものにできる。排気浄化装置１がコンパクトになることにより、排気浄化装置１の熱容量を小さくでき、触媒の温度管理を容易にでき、排ガスを効率よく浄化できる。また、排気浄化装置１のレイアウトの自由度が増すため、よりエンジンの近くに排気浄化装置１を配置できる。排気浄化装置１をエンジン近傍に配置した場合、排ガスをより高い温度で排気浄化装置１に供給でき、排ガスを効率よく浄化できる。   As described above, the DPF 3 provided in the exhaust pipe 2 through which the exhaust gas from the diesel engine flows, the first oxidation catalyst 4 provided in the exhaust pipe 2 upstream of the DPF 3, and the exhaust pipe 2 upstream of the first oxidation catalyst 4. In the exhaust gas purification apparatus 1 including the light oil injection device 5 that injects light oil into the exhaust gas when the DPF 3 is forcibly regenerated, the DPF 3 has a porous DPF carrier 8 through which the exhaust gas passes, and the exhaust gas of the DPF carrier 8 The exhaust gas is composed of a urea decomposition catalyst 10 supported on the wall 9 on the inlet side and a urea SCR catalyst 11 supported on the wall 9 on the exhaust gas outlet side of the DPF carrier 8. The exhaust gas is downstream from the first oxidation catalyst 4 and upstream from the DPF 3. Since the urea injection device 6 for injecting urea into the exhaust gas is connected to the pipe 2, the exhaust purification device 1 can be made compact and inexpensive. By making the exhaust purification device 1 compact, the heat capacity of the exhaust purification device 1 can be reduced, the temperature control of the catalyst can be facilitated, and the exhaust gas can be purified efficiently. Further, since the degree of freedom of the layout of the exhaust purification device 1 is increased, the exhaust purification device 1 can be disposed closer to the engine. When the exhaust emission control device 1 is disposed in the vicinity of the engine, the exhaust gas can be supplied to the exhaust emission purification device 1 at a higher temperature, and the exhaust gas can be efficiently purified.

また、ＤＰＦ担体８が、排気管２の軸方向に延びる複数の穴１２を有する格子状に形成されると共に、互いに隣接する穴１２の上流端と下流端が交互に目封じされ、これら穴１２間のＤＰＦ担体８に壁９が形成されるものとしたため、広い面積で効率よく排ガス中のＮＯｘを無害化できる。   In addition, the DPF carrier 8 is formed in a lattice shape having a plurality of holes 12 extending in the axial direction of the exhaust pipe 2, and the upstream end and the downstream end of the adjacent holes 12 are alternately sealed, and these holes 12 Since the wall 9 is formed on the DPF carrier 8 in the middle, NOx in the exhaust gas can be made harmless efficiently over a wide area.

そして、ＤＰＦ３より下流の排気管２に第２酸化触媒７を設けたため、アンモニアのリークをより確実に防止できる。   And since the 2nd oxidation catalyst 7 was provided in the exhaust pipe 2 downstream from DPF3, the leak of ammonia can be prevented more reliably.

１ 排気浄化装置
２ 排気管
３ ＤＰＦ
４ 第１酸化触媒（酸化触媒）
５ 軽油噴射装置
６ 尿素噴射装置
８ ＤＰＦ担体
９ 壁
１０ 尿素分解触媒
１１ 尿素ＳＣＲ触媒
１２ 穴 1 Exhaust purification device 2 Exhaust pipe 3 DPF
4 First oxidation catalyst (oxidation catalyst)
5 Light oil injection device 6 Urea injection device 8 DPF carrier 9 Wall 10 Urea decomposition catalyst 11 Urea SCR catalyst 12 Hole

Claims (3)

ディーゼルエンジンからの排ガスを流す排気管に設けられたＤＰＦと、該ＤＰＦより上流の上記排気管に設けられた酸化触媒と、該酸化触媒より上流の上記排気管に接続され上記ＤＰＦを強制再生するとき排ガス中に軽油を噴射する軽油噴射装置とを備えた排気浄化装置において、上記ＤＰＦが、排ガスを通過させる多孔質のＤＰＦ担体と、該ＤＰＦ担体の排ガス入口側の壁に担持された尿素分解触媒と、上記ＤＰＦ担体の排ガス出口側の壁に担持された尿素ＳＣＲ触媒とからなり、上記酸化触媒より下流かつ上記ＤＰＦより上流の上記排気管に排ガス中に尿素を噴射する尿素噴射装置を接続したことを特徴とする排気浄化装置。   A DPF provided in an exhaust pipe for flowing exhaust gas from a diesel engine, an oxidation catalyst provided in the exhaust pipe upstream from the DPF, and the DPF forcibly regenerated by being connected to the exhaust pipe upstream from the oxidation catalyst In an exhaust gas purification apparatus comprising a light oil injection device for injecting light oil into exhaust gas, the DPF is a porous DPF carrier through which the exhaust gas passes, and a urea decomposition carried on the exhaust gas inlet side wall of the DPF carrier A urea injection device for injecting urea into exhaust gas is connected to the exhaust pipe downstream of the oxidation catalyst and upstream of the DPF, comprising a catalyst and a urea SCR catalyst carried on the exhaust gas outlet side wall of the DPF carrier An exhaust purification device characterized by that. 上記ＤＰＦ担体が、上記排気管の軸方向に延びる複数の穴を有する格子状に形成されると共に、互いに隣接する穴の上流端と下流端が交互に目封じされ、これら穴間のＤＰＦ担体に上記壁が形成された請求項１記載の排気浄化装置。   The DPF carrier is formed in a lattice shape having a plurality of holes extending in the axial direction of the exhaust pipe, and the upstream end and the downstream end of holes adjacent to each other are alternately sealed, and the DPF carrier between these holes is attached to the DPF carrier. The exhaust emission control device according to claim 1, wherein the wall is formed. 上記ＤＰＦより下流の排気管に酸化触媒を設けた請求項１又は２記載の排気浄化装置。   The exhaust emission control device according to claim 1 or 2, wherein an oxidation catalyst is provided in an exhaust pipe downstream of the DPF.
JP2009145294A 2009-06-18 2009-06-18 Exhaust emission control device Pending JP2011001875A (en)

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