JP2003232218A - Exhaust emission control device for engine - Google Patents

Exhaust emission control device for engine

Info

Publication number
JP2003232218A
JP2003232218A JP2002032385A JP2002032385A JP2003232218A JP 2003232218 A JP2003232218 A JP 2003232218A JP 2002032385 A JP2002032385 A JP 2002032385A JP 2002032385 A JP2002032385 A JP 2002032385A JP 2003232218 A JP2003232218 A JP 2003232218A
Authority
JP
Japan
Prior art keywords
exhaust gas
liquid
selective reduction
mixer
exhaust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002032385A
Other languages
Japanese (ja)
Inventor
Mitsuru Hosoya
満 細谷
Hironobu Mogi
浩伸 茂木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hino Motors Ltd
Original Assignee
Hino Motors Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hino Motors Ltd filed Critical Hino Motors Ltd
Priority to JP2002032385A priority Critical patent/JP2003232218A/en
Publication of JP2003232218A publication Critical patent/JP2003232218A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • 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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20761—Copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—Zeolites
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To uniformize a urea-based liquid reaching a selective reduction type catalyst. <P>SOLUTION: This exhaust emission control device is provided with the selective reduction type catalyst 24 disposed in the exhaust pipe 16 of an engine 11, and a liquid injection nozzle 29 disposed in the exhaust pipe 16 on the upstream side of the selective reduction type catalyst 24 and capable of injecting the urea-based liquid 32 toward the selective reduction type catalyst 24. A mixer 51 for mixing exhaust gas with the liquid 32 injected from the liquid injection nozzle 29 is arranged in the exhaust pipe 16 between the liquid injection nozzle 29 and the selective reduction type catalyst 24. The mixer 51 is provided with a mixer body 52 having a cylindrical part 52a capable of passing exhaust gas in an axis direction, and a plurality of partitioning plates 53 arranged at required intervals in the mixer body 52 to interrupt the passing of exhaust gas in the inside of the cylindrical part 52a and having a plurality of gas holes 53a. The plurality of gas holes 53a are so formed as not to overlap with the plurality of gas holes 53a formed in the adjacent partitioning plates 53 and the axis direction of the cylindrical part 52a. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、ディーゼルエンジ
ンの排ガスに含まれる窒素酸化物（以下、ＮＯｘとい
う）を低減する排ガス浄化装置に関するものである。TECHNICAL FIELD The present invention relates to an exhaust gas purifying apparatus for reducing nitrogen oxides (hereinafter referred to as NOx) contained in exhaust gas of a diesel engine.

【０００２】[0002]

【従来の技術】従来、この種の排ガス浄化装置として、
ディーゼルエンジンの排気通路の途中に選択還元型触媒
を設け、その選択還元型触媒より排ガス上流側の排気管
に、その選択還元型触媒に向けて尿素系液体を噴射可能
な液体噴射ノズルを設けたディーゼルエンジンの排ガス
浄化装置が知られている（特開２０００−８８３３
号）。このように構成されたディーゼルエンジンの排ガ
ス浄化装置では、液体噴射ノズルから噴射された尿素系
液体が排ガスの熱により加熱されて加水分解し、アンモ
ニアが生じる。そしてこのアンモニアは排気ガス中のＮ
Ｏｘを選択還元型触媒によって浄化する還元剤として機
能し、大気に排出されるＮＯｘの量を低減できるように
なっている。2. Description of the Related Art Conventionally, as an exhaust gas purifying device of this type,
A selective reduction catalyst was provided in the middle of the exhaust passage of the diesel engine, and a liquid injection nozzle capable of injecting a urea-based liquid toward the selective reduction catalyst was provided in the exhaust pipe on the exhaust gas upstream side of the selective reduction catalyst. An exhaust gas purification device for a diesel engine is known (Japanese Patent Laid-Open No. 2000-8833).
issue). In the exhaust gas purifying apparatus for a diesel engine configured in this way, the urea-based liquid injected from the liquid injection nozzle is heated by the heat of the exhaust gas and hydrolyzed to generate ammonia. And this ammonia is N in the exhaust gas
It functions as a reducing agent that purifies Ox by a selective reduction catalyst, and can reduce the amount of NOx discharged to the atmosphere.

【０００３】[0003]

【発明が解決しようとする課題】しかし、上記従来の排
ガス浄化装置では、液体噴射ノズルから噴射された尿素
系液体は排ガスの流れに沿って選択還元型触媒に向かう
ため、尿素系液体が選択還元触媒に局部的に集中して到
達する不具合があった。尿素系液体が局部的に集中する
と、その集中した尿素系液体が加水分解して生じるアン
モニアがその部分において過剰になり、ＮＯｘを還元さ
せる還元反応に用いられなかったアンモニアが直接大気
中に排出される不具合がる。一方、選択還元型触媒にお
いて尿素系液体が希薄な部分では、加水分解して生じる
アンモニアの量が不足してその部分においてＮＯｘを十
分に還元することが困難になり、ＮＯｘ排出量を十分に
低減できない不具合が生じる。本発明の目的は、選択還
元型触媒に到達する尿素系液体を均一にしてＮＯｘ排出
量を低減するとともにアンモニアが大気中に排出される
のを有効に防止し得るエンジンの排ガス浄化装置を提供
することにある。However, in the above-mentioned conventional exhaust gas purifying apparatus, the urea liquid injected from the liquid injection nozzle goes to the selective reduction catalyst along the flow of the exhaust gas, so that the urea liquid is selectively reduced. There was a problem that the catalyst was locally concentrated and reached. When the urea-based liquid is locally concentrated, ammonia produced by hydrolysis of the concentrated urea-based liquid becomes excessive in that portion, and ammonia not used in the reduction reaction for reducing NOx is directly discharged into the atmosphere. There is a problem. On the other hand, in the portion where the urea-based liquid is diluted in the selective reduction catalyst, the amount of ammonia produced by hydrolysis is insufficient, and it becomes difficult to sufficiently reduce NOx in that portion, and the NOx emission amount is sufficiently reduced. There is a problem that cannot be done. An object of the present invention is to provide an exhaust gas purifying apparatus for an engine, which can make the urea-based liquid reaching the selective reduction catalyst uniform to reduce the NOx emission amount and effectively prevent ammonia from being emitted into the atmosphere. Especially.

【０００４】[0004]

【課題を解決するための手段】請求項１に係る発明は、
図１に示すように、エンジン１１の排気管１６に設けら
れた選択還元型触媒２４と、選択還元型触媒２４より排
ガス上流側の排気管１６に設けられ選択還元型触媒２４
に向けて尿素系液体３２を噴射可能な液体噴射ノズル２
９とを備えたエンジンの排ガス浄化装置の改良である。
その特徴ある構成は、液体噴射ノズル２９から噴射され
た液体３２を排ガスに混合可能に構成されたミキサ５１
が液体噴射ノズル２９と選択還元型触媒２４の間の排気
管１６に設けられたところにある。この請求項１に記載
されたエンジンの排ガス浄化装置では、液体噴射ノズル
２９から噴射された尿素系液体３２は、選択還元型触媒
２４に向かって排ガスの流れに沿って流れてミキサ５１
に流入する。このミキサ５１で排ガス中に噴射された尿
素系液体３２はその排ガスに混合され、ミキサ５１を通
過した段階で排ガスに十分に混合された尿素系液体３２
は選択還元型触媒２４に均一に到達する。The invention according to claim 1 is
As shown in FIG. 1, the selective reduction catalyst 24 provided in the exhaust pipe 16 of the engine 11 and the selective reduction catalyst 24 provided in the exhaust pipe 16 on the exhaust gas upstream side of the selective reduction catalyst 24.
Liquid injection nozzle 2 capable of injecting urea-based liquid 32 toward
9 is an improvement of an exhaust gas purifying apparatus for an engine equipped with.
The characteristic configuration of the mixer 51 is such that the liquid 32 jetted from the liquid jet nozzle 29 can be mixed with the exhaust gas.
Is provided in the exhaust pipe 16 between the liquid injection nozzle 29 and the selective reduction catalyst 24. In the exhaust gas purifying apparatus for an engine according to claim 1, the urea-based liquid 32 injected from the liquid injection nozzle 29 flows along the flow of the exhaust gas toward the selective reduction catalyst 24 and the mixer 51.
Flow into. The urea liquid 32 injected into the exhaust gas by the mixer 51 is mixed with the exhaust gas, and the urea liquid 32 sufficiently mixed with the exhaust gas when passing through the mixer 51.
Reaches the selective reduction catalyst 24 uniformly.

【０００５】請求項２に係る発明は、請求項１に係る発
明であって、更に図２に示すように、ミキサ５１が、軸
線方向に排ガスを通過可能な筒部５２ａを有するミキサ
本体５２と、筒部５２ａの内部の排ガスの通過を遮るよ
うにミキサ本体５２に所定の間隔をあけて設けられ複数
のガス孔５３ａ，５４ａ，５５ａがそれぞれ形成された
複数枚の仕切板５３，５４，５５とを備え、複数のガス
孔５３ａ，５４ａ，５５ａは隣接する仕切板５３，５
４，５５に形成された複数のガス孔５３ａ，５４ａ，５
５ａと筒部５２ａの軸線方向に重ならないように複数の
仕切板５３，５４，５５にそれぞれ形成されたエンジン
の排ガス浄化装置である。この請求項２に係るエンジン
の排ガス浄化装置では、ミキサ５１でに流入した排ガス
は複数の仕切板５３，５４，５５にそれぞれ形成された
複数のガス孔５３ａ，５４ａ，５５ａを通過するが、こ
の複数のガス孔５３ａ，５４ａ，５５ａは隣接する仕切
板５３，５４，５５に形成された複数のガス孔５３ａ，
５４ａ，５５ａと筒部５２ａの軸線方向に重ならないよ
うにそれぞれ形成されているため、図２の破線矢印で示
すように蛇行して通過する。排ガスが蛇行して進むこと
により、その排ガス中に噴射された尿素系液体３２はそ
の排ガスに混合される。The invention according to claim 2 is the invention according to claim 1, further, as shown in FIG. 2, the mixer 51 includes a mixer main body 52 having a tubular portion 52a through which exhaust gas can pass in the axial direction. , A plurality of partition plates 53, 54, 55 provided in the mixer main body 52 at predetermined intervals so as to block passage of exhaust gas inside the tubular portion 52a and each having a plurality of gas holes 53a, 54a, 55a formed therein. And the plurality of gas holes 53a, 54a, 55a are adjacent to the partition plates 53, 5
A plurality of gas holes 53a, 54a, 5 formed in 4, 55
The exhaust gas purifying apparatus for an engine is formed on each of a plurality of partition plates 53, 54, 55 so as not to overlap the shaft portion 5a and the tubular portion 52a in the axial direction. In the exhaust gas purifying apparatus for an engine according to this aspect, the exhaust gas flowing into the mixer 51 passes through the plurality of gas holes 53a, 54a, 55a formed in the plurality of partition plates 53, 54, 55, respectively. The plurality of gas holes 53a, 54a, 55a are formed in the adjacent partition plates 53, 54, 55.
54a and 55a and the cylindrical portion 52a are formed so as not to overlap each other in the axial direction, so that they meander and pass as indicated by the broken line arrow in FIG. As the exhaust gas meanders and advances, the urea liquid 32 injected into the exhaust gas is mixed with the exhaust gas.

【０００６】[0006]

【発明の実施の形態】次に本発明の実施の形態を図面に
基づいて説明する。図１に示すように、ディーゼルエン
ジン１１の吸気ポートには吸気マニホルド１２を介して
吸気管１３が接続され、排気ポートには排気マニホルド
１４を介して排気管１６が接続される。吸気管１３に
は、ターボ過給機１７のコンプレッサ１７ａと、ターボ
過給機１７により圧縮された吸気を冷却するインタクー
ラ１８とがそれぞれ設けられ、排気管１６にはターボ過
給機１７のタービン１７ｂが設けられる。図示しないが
コンプレッサ１７ａの回転翼とタービン１７ｂの回転翼
とはシャフトにより連結される。エンジン１１から排出
される排ガスのエネルギによりタービン１７ｂ及びシャ
フトを介してコンプレッサ１７ａが回転し、このコンプ
レッサ１７ａの回転により吸気管１３内の吸入空気が圧
縮されるように構成される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an intake pipe 13 is connected to an intake port of a diesel engine 11 via an intake manifold 12, and an exhaust pipe 16 is connected to an exhaust port via an exhaust manifold 14. The intake pipe 13 is provided with a compressor 17a of the turbocharger 17 and an intercooler 18 for cooling the intake air compressed by the turbocharger 17, and the exhaust pipe 16 is provided with a turbine 17b of the turbocharger 17. Is provided. Although not shown, the rotary blades of the compressor 17a and the turbine 17b are connected by a shaft. The compressor 17a is rotated by the energy of the exhaust gas discharged from the engine 11 via the turbine 17b and the shaft, and the intake air in the intake pipe 13 is compressed by the rotation of the compressor 17a.

【０００７】排気管１６の途中には選択還元型触媒２４
が設けられる。触媒２４は排気管１６の直径を拡大した
筒状のコンバータ２７に収容される。この実施の形態に
おける触媒２４は、排気管１６に流入する排ガス中のＮ
Ｏｘを比較的低温の２００〜３００℃で還元する銅ゼオ
ライト系の触媒が用いられる場合を示すが、酸化チタン
又は酸化バナジウム又は酸化タングステン等から成る触
媒であっても良い。A selective reduction type catalyst 24 is provided in the middle of the exhaust pipe 16.
Is provided. The catalyst 24 is housed in a cylindrical converter 27 in which the diameter of the exhaust pipe 16 is enlarged. The catalyst 24 in this embodiment is the N in the exhaust gas flowing into the exhaust pipe 16.
The case where a copper zeolite-based catalyst that reduces Ox at a relatively low temperature of 200 to 300 ° C. is used is shown, but a catalyst made of titanium oxide, vanadium oxide, tungsten oxide, or the like may be used.

【０００８】触媒２４の排ガス上流側の排気管１６、即
ち触媒２４の入口には、後述するミキサ５１を介して液
体噴射ノズル２９が触媒２４に向けて設けられる。この
液体噴射ノズル２９には液体供給管３１の一端が接続さ
れ、この液体供給管３１の他端は尿素系液体３２が貯留
された液体タンク３３に接続される。また液体供給管３
１には液体噴射ノズル２９への液体３２の供給量を調整
する液体調整弁３４が設けられ、液体調整弁３４と液体
タンク３３との間の液体供給管３１には液体タンク３３
内の液体３２を液体噴射ノズル２９に供給可能なポンプ
３６が設けられる。液体調整弁３４の第１ポート３４ａ
はポンプ３６の吐出口に接続され、第２ポート３４ｂは
液体噴射ノズル２９に接続される。そして、液体調整弁
３４がオンすると第１及び第２ポート３４ａ，３４ｂが
所定の開度で連通し、オフすると第１及び第２ポート３
４ａ，３４ｂの連通が遮断されるように構成される。At the exhaust pipe 16 on the exhaust gas upstream side of the catalyst 24, that is, at the inlet of the catalyst 24, a liquid injection nozzle 29 is provided toward the catalyst 24 via a mixer 51 described later. One end of a liquid supply pipe 31 is connected to the liquid injection nozzle 29, and the other end of the liquid supply pipe 31 is connected to a liquid tank 33 in which a urea liquid 32 is stored. Liquid supply pipe 3
1 is provided with a liquid adjusting valve 34 for adjusting the supply amount of the liquid 32 to the liquid jet nozzle 29, and a liquid tank 33 is provided in a liquid supply pipe 31 between the liquid adjusting valve 34 and the liquid tank 33.
A pump 36 capable of supplying the liquid 32 therein to the liquid jet nozzle 29 is provided. First port 34a of liquid regulating valve 34
Is connected to the discharge port of the pump 36, and the second port 34b is connected to the liquid jet nozzle 29. When the liquid adjusting valve 34 is turned on, the first and second ports 34a and 34b communicate with each other at a predetermined opening, and when turned off, the first and second ports 3 are opened.
It is configured so that the communication between 4a and 34b is blocked.

【０００９】液体調整弁３４及びポンプ３６には、マイ
クロコンピュータからなるコントローラ４４の制御出力
がそれぞれ接続される。このコントローラ４４の制御入
力には、選択還元型触媒２４上流側の排気管１６に設け
られ排ガスの温度を検出する温度センサ４３と、エンジ
ン１１の回転速度を検出する回転センサ４６と、エンジ
ン１１の負荷を検出する負荷センサ４７の各検出出力が
接続される。上記負荷センサ４７はこの実施の形態では
燃料噴射ポンプ（図示せず）のロードレバーの変位量を
検出する。コントローラ４４はメモリ４４ａを備える。
メモリ４４ａには、排ガス温度、エンジン回転、エンジ
ン負荷等に応じた液体調整弁３４のオン又はオフ並びに
オン時における開度、更にポンプ３６の作動の有無が予
め記憶される。そして、コントローラ４４は温度センサ
４３、回転センサ４６及び負荷センサ４７の検出出力に
基づいてエンジン１１の運転状況を把握し、その運転状
況からメモリ４４ａに記憶された条件に従って液体調整
弁３４及びポンプ３６を制御し、その運転状況に応じた
最適な量の尿素系液体３２を噴射ノズル２９から噴射す
るように構成される。A control output of a controller 44 composed of a microcomputer is connected to the liquid regulating valve 34 and the pump 36, respectively. The control input of the controller 44 includes a temperature sensor 43 provided in the exhaust pipe 16 on the upstream side of the selective reduction catalyst 24 for detecting the temperature of exhaust gas, a rotation sensor 46 for detecting the rotation speed of the engine 11, and a rotation sensor 46 for the engine 11. Each detection output of the load sensor 47 which detects a load is connected. The load sensor 47 detects the displacement amount of the load lever of the fuel injection pump (not shown) in this embodiment. The controller 44 includes a memory 44a.
The memory 44a stores in advance the on / off state of the liquid adjusting valve 34 according to the exhaust gas temperature, the engine rotation, the engine load, and the like, the opening degree at the time of the on state, and the presence / absence of the operation of the pump 36. Then, the controller 44 grasps the operating condition of the engine 11 based on the detection outputs of the temperature sensor 43, the rotation sensor 46 and the load sensor 47, and according to the condition stored in the memory 44a from the operating condition, the liquid regulating valve 34 and the pump 36. Is controlled and the optimum amount of the urea-based liquid 32 according to the operating condition is injected from the injection nozzle 29.

【００１０】本発明の特徴ある構成は、液体噴射ノズル
２９から噴射された尿素系液体３２を排ガスに混合可能
に構成されたミキサ５１が、液体噴射ノズル２９と選択
還元型触媒２４の間の排気管１６に設けられたところに
ある。そして、この実施の形態におけるミキサ５１は、
軸線方向に排ガスを通過可能な筒部５２ａを有するミキ
サ本体５２と、このミキサ本体５２に設けられた複数枚
の仕切板５３，５４，５５とを備える。A characteristic feature of the present invention is that the mixer 51 configured to mix the urea liquid 32 injected from the liquid injection nozzle 29 with the exhaust gas is exhausted between the liquid injection nozzle 29 and the selective reduction catalyst 24. It is located in the pipe 16. Then, the mixer 51 in this embodiment is
The mixer main body 52 has a tubular portion 52a that allows exhaust gas to pass through in the axial direction, and a plurality of partition plates 53, 54, 55 provided on the mixer main body 52.

【００１１】図２に詳しく示すように、ミキサ本体５２
は、ステンレス鋼板を円筒状にすることにより形成され
た筒部５２ａの両端に、ステンレス鋼板を漏斗状にする
ことにより形成された蓋体５２ｂ，５２ｃを溶接するこ
とにより作られる。即ち、蓋体５２ｂ，５２ｃの筒部５
２ａに臨む一端部はその筒部５２ａの外径に等しく形成
されて溶接される。一方、蓋体５２ｂ，５２ｃの他端部
は排気管１６の直径に相応して形成され、その他端部に
おける外周囲には排気管１６に接続するための環状のフ
ランジ部材５２ｄ，５２ｅがそれぞれ溶接される。この
フランジ部材５２ｄ，５２ｅには複数の取付孔５２ｆ，
５２ｇがそれぞれ形成され、排気管１６の端縁に設けら
れた被取付部材１６ａ，１６ｂ（図１）にねじ止め可能
に構成される。As shown in detail in FIG. 2, the mixer main body 52
Is manufactured by welding lids 52b and 52c formed by forming a stainless steel plate into a funnel shape to both ends of a cylindrical portion 52a formed by forming a stainless steel plate into a cylindrical shape. That is, the tubular portion 5 of the lids 52b and 52c
One end facing 2a is formed to have the same outer diameter as the cylindrical portion 52a and is welded. On the other hand, the other ends of the lids 52b and 52c are formed to correspond to the diameter of the exhaust pipe 16, and annular flange members 52d and 52e for connecting to the exhaust pipe 16 are welded to the outer circumferences of the other ends, respectively. To be done. The flange members 52d and 52e have a plurality of mounting holes 52f,
52 g are formed respectively and can be screwed to the attached members 16 a and 16 b (FIG. 1) provided on the end edge of the exhaust pipe 16.

【００１２】一方、複数枚の仕切板５３，５４，５５
は、筒部５２ａの内部の排ガスの通過を遮るように所定
の間隔をあけてミキサ本体５２に設けられる。この実施
の形態では厚さが１．２ｍｍのステンレス鋼板から作ら
れた３枚の仕切板５３，５４，５５が設けられる場合を
示し、３枚の仕切板５３，５４，５５には複数のガス孔
５３ａ，５４ａ，５５ａがそれぞれ形成される。この実
施の形態では８個のガス孔５３ａ，５４ａ，５５ａがそ
れぞれの仕切板５３，５４，５５に形成される例を示
し、８個のガス孔５３ａ，５４ａ，５５ａの面積の和が
排気管１６の排ガス流通断面積より大きくなるように調
整される。また、仕切板５３，５４，５５の外周には筒
部５２ａの内面に外面が接触するフランジ５３ｂ，５４
ｂ，５５ｂがそれぞれ形成される。そして、このフラン
ジ５３ｂ，５４ｂ，５５ｂを筒部５２ａに抵抗溶接する
ことにより、３枚の仕切板５３，５４，５５は所定の間
隔をあけてミキサ本体５２にそれぞれ設けられる。ここ
で、所定の間隔は１ｃｍ〜１０ｃｍが好ましく、２ｃｍ
〜３ｃｍであることが更に好ましい。また、フランジ５
３ｂ，５４ｂ，５５ｂを筒部５２ａに溶接する際に、そ
れぞれの仕切板５３，５４，５５における複数のガス孔
５３ａ，５４ａ，５５ａが、隣接する仕切板５３，５
４，５５に形成された複数のガス孔５３ａ，５４ａ，５
５ａと筒部５２ａの軸線方向に重ならないように調整さ
れる。On the other hand, a plurality of partition plates 53, 54, 55
Are provided in the mixer main body 52 at predetermined intervals so as to block passage of exhaust gas inside the tubular portion 52a. In this embodiment, a case where three partition plates 53, 54, 55 made of a stainless steel plate having a thickness of 1.2 mm are provided is shown, and the three partition plates 53, 54, 55 have a plurality of gasses. Holes 53a, 54a, 55a are formed, respectively. In this embodiment, an example is shown in which eight gas holes 53a, 54a, 55a are formed in each partition plate 53, 54, 55, and the sum of the areas of the eight gas holes 53a, 54a, 55a is the exhaust pipe. It is adjusted to be larger than the exhaust gas circulation cross-sectional area of 16. Further, on the outer periphery of the partition plates 53, 54, 55, flanges 53b, 54 whose outer surface contacts the inner surface of the tubular portion 52a
b and 55b are formed respectively. By resistance welding the flanges 53b, 54b, 55b to the tubular portion 52a, the three partition plates 53, 54, 55 are provided in the mixer main body 52 at predetermined intervals. Here, the predetermined interval is preferably 1 cm to 10 cm, and 2 cm
More preferably, it is 3 cm. Also, the flange 5
When welding 3b, 54b, 55b to the cylindrical portion 52a, the plurality of gas holes 53a, 54a, 55a in the respective partition plates 53, 54, 55 are arranged so that the adjacent partition plates 53, 5
A plurality of gas holes 53a, 54a, 5 formed in 4, 55
5a and the tubular portion 52a are adjusted so as not to overlap in the axial direction.

【００１３】このように構成されたミキサ５１は、図１
に示すように分断された排気管１６の中間に設けられ
る。即ち、排気管１６は選択還元型触媒２４の上流側近
傍において分断され、その分断された部分における排気
管１６のそれぞれの端縁に被取付部材１６ａ，１６ｂが
それぞれ設けられる。そして、分断された部分にミキサ
５１を挿入して、ミキサ５１の両端に設けられたそれぞ
れのフランジ部材５２ｄ，５２ｅを被取付部材１６ａ，
１６ｂにそれぞれねじ止めすることによりミキサ５１は
液体噴射ノズル２９と選択還元型触媒２４の間の排気管
１６に設けられる。The mixer 51 constructed in this manner is shown in FIG.
It is provided in the middle of the exhaust pipe 16 divided as shown in FIG. That is, the exhaust pipe 16 is divided in the vicinity of the upstream side of the selective reduction catalyst 24, and the attached members 16a and 16b are provided on the respective edges of the exhaust pipe 16 in the divided portions. Then, the mixer 51 is inserted into the divided portion, and the flange members 52d and 52e provided at both ends of the mixer 51 are attached to the attached members 16a,
The mixer 51 is provided in the exhaust pipe 16 between the liquid injection nozzle 29 and the selective reduction catalyst 24 by being screwed to 16 b.

【００１４】このように構成されたエンジンの排ガス浄
化装置の動作を説明する。エンジン１１を始動し、尿素
が加水分解できない温度であること、具体的にこの実施
の形態では２２０℃未満の排ガス温度を温度センサ４３
が検出したとき、コントローラ４４はこの検出出力に基
づいて、液体調整弁３４をオフする。これにより液体調
整弁３４における第１及び第２ポート３４ａ，３４ｂの
連通は遮断されて、尿素が加水分解できない温度におけ
る尿素系液体３２の噴射が回避される。The operation of the engine exhaust gas purifying apparatus thus configured will be described. When the engine 11 is started and the temperature is such that urea cannot be hydrolyzed, specifically, in this embodiment, the temperature sensor 43 detects an exhaust gas temperature of less than 220 ° C.
Is detected, the controller 44 turns off the liquid adjusting valve 34 based on this detection output. As a result, the communication between the first and second ports 34a and 34b of the liquid adjustment valve 34 is blocked, and the injection of the urea liquid 32 at a temperature at which urea cannot be hydrolyzed is avoided.

【００１５】尿素が加水分解する温度であること、具体
的にこの実施の形態では温度センサ４３が２２０℃以上
の排ガス温度を検出した状態で、コントローラ４４はポ
ンプ３６を駆動するとともに液体調整弁３４をオンして
液体調整弁３４における第１及び第２ポート３４ａ，３
４ｂを連通させ、液体噴射ノズル２９から尿素系液体３
２を噴射する。これは、排気ガス中のＮＯｘを選択還元
型触媒２４によって浄化するのに還元剤が必要だからで
あり、尿素系液体３２は予め所定の濃度に調整されたも
のが液体タンク３３に貯留される。そしてコントローラ
４４は回転センサ４６及び負荷センサ４７の各検出出力
に基づいて求められるディーゼルエンジン１１の運転状
態から排気ガス中のＮＯｘ濃度を推定し、このＮＯｘを
浄化するのに必要な還元剤としての尿素量を求めて液体
噴射ノズル２９から必要な量の尿素系液体３２を噴射す
る。At a temperature at which urea is hydrolyzed, specifically, in this embodiment, the controller 44 drives the pump 36 and the liquid adjusting valve 34 while the temperature sensor 43 detects the exhaust gas temperature of 220 ° C. or higher. And the first and second ports 34a, 3 of the liquid regulating valve 34 are turned on.
4b are communicated with each other, and the urea-based liquid 3 is discharged from the liquid injection nozzle 29.
Inject 2. This is because a reducing agent is required to purify NOx in the exhaust gas by the selective reduction catalyst 24, and the urea liquid 32, which has been adjusted to a predetermined concentration in advance, is stored in the liquid tank 33. Then, the controller 44 estimates the NOx concentration in the exhaust gas from the operating state of the diesel engine 11 obtained based on the detection outputs of the rotation sensor 46 and the load sensor 47, and serves as a reducing agent necessary for purifying this NOx. The amount of urea is calculated, and the necessary amount of urea liquid 32 is ejected from the liquid ejection nozzle 29.

【００１６】液体噴射ノズル２９から噴射された尿素系
液体３２は、選択還元型触媒２４に向かって排ガスの流
れに沿って流れ、液体噴射ノズル２９と選択還元型触媒
２４の間に設けられたミキサ５１に流入する。ミキサ５
１に流入した排ガスは３枚の仕切板５３，５４，５５に
それぞれ形成された複数のガス孔５３ａ，５４ａ，５５
ａを通過するが、この複数のガス孔５３ａ，５４ａ，５
５ａは隣接する仕切板５３，５４，５５に形成された複
数のガス孔５３ａ，５４ａ，５５ａと筒部５２ａの軸線
方向に重ならないようにそれぞれ形成されているため、
図２の破線矢印で示すように蛇行して通過する。排ガス
が蛇行して進むことにより、その排ガス中に噴射された
尿素系液体３２はその排ガスに混合され、ミキサ５１を
通過した段階で排ガスに十分に混合された尿素系液体３
２は選択還元型触媒２４に均一に到達する。The urea-based liquid 32 injected from the liquid injection nozzle 29 flows along the flow of the exhaust gas toward the selective reduction catalyst 24, and the mixer provided between the liquid injection nozzle 29 and the selective reduction catalyst 24. Flows into 51. Mixer 5
The exhaust gas that has flowed into 1 is a plurality of gas holes 53a, 54a, 55 formed in the three partition plates 53, 54, 55, respectively.
a, but the gas holes 53a, 54a, 5
5a is formed so as not to overlap the plurality of gas holes 53a, 54a, 55a formed in the adjacent partition plates 53, 54, 55 with the tubular portion 52a in the axial direction, respectively.
As shown by the broken line arrow in FIG. 2, it meanders and passes. As the exhaust gas meanders and advances, the urea liquid 32 injected into the exhaust gas is mixed with the exhaust gas, and when passing through the mixer 51, the urea liquid 3 sufficiently mixed with the exhaust gas.
2 reaches the selective reduction catalyst 24 uniformly.

【００１７】選択還元型触媒２４に均一に到達した尿素
系液体３２は、排気ガスによって加熱されて次のような
化学反応により加水分解しアンモニアを生じる。 （ＮＨ2）２・ＣＯ ＋ Ｈ2Ｏ → ＣＯ2 ＋ ２ＮＨ3 このアンモニアは、次のような化学反応によりＮＯ、Ｎ
Ｏ2を還元してＮＯｘの排出量を低減するとともに、尿
素系液体３２が均一に選択還元型触媒２４に到達するこ
とによりアンモニアの大部分が還元剤として機能し、還
元剤として使用されないアンモニアが大気中に排出され
るのを有効に防止する。 ４ＮＯ ＋ ４ＮＨ3 ＋ Ｏ2 → ４Ｎ2 ＋ ６Ｈ2Ｏ ６ＮＯ2 ＋ ８ＮＨ3 → ７Ｎ2 ＋ １２Ｈ2Ｏ なお、この実施の形態では、エンジンとしてターボ過給
機付ディーゼルエンジンを挙げたが、自然吸気型ディー
ゼルエンジンに本発明の排ガス浄化装置を用いてもよ
い。The urea liquid 32 that has reached the selective reduction catalyst 24 uniformly is heated by the exhaust gas and hydrolyzed by the following chemical reaction to produce ammonia. (NH 2 ) 2 · CO + H 2 O → CO 2 + 2NH 3 This ammonia is NO, N due to the following chemical reaction.
O 2 is reduced to reduce NOx emissions, and most of the ammonia functions as a reducing agent because the urea-based liquid 32 reaches the selective reduction catalyst 24 uniformly, and ammonia not used as a reducing agent is removed. Effectively prevent its release into the atmosphere. 4NO + 4NH 3 + O 2 → 4N 2 + 6H 2 O 6NO 2 + 8NH 3 → 7N 2 + 12H 2 O In this embodiment, a diesel engine with a turbocharger is used as the engine, but naturally aspirated. The exhaust gas purifying apparatus of the present invention may be used for a diesel engine of the type.

【００１８】また、上述した実施の形態では、厚さが
１．２ｍｍのステンレス鋼板から作られた３枚の仕切板
５３，５４，５５がミキサ本体５２に設けられる場合を
示したが、仕切板の厚さは０．８ｍｍ又は１．５ｍｍで
あっても良く、ステンレス鋼板でなくいわゆるＳＳ鋼材
であっても良い。また、仕切板の枚数は、複数枚であれ
ば３枚でなく、２枚、４枚、５枚、又は６枚であっても
良い。また、上述した実施の形態では、８個のガス孔５
３ａ，５４ａ，５５ａがそれぞれの仕切板５３，５４，
５５に形成される例を示したが、ガス孔５３ａ，５４
ａ，５５ａの数は、その面積の和が排気管１６の排ガス
流通断面積より大きければ良く、４個、６個、１２個、
１８個又は２４個のガス孔５３ａ，５４ａ，５５ａをそ
れぞれの仕切板５３，５４，５５に形成しても良い。Further, in the above-described embodiment, the case where the three partition plates 53, 54, 55 made of a stainless steel plate having a thickness of 1.2 mm are provided in the mixer main body 52 has been described. May have a thickness of 0.8 mm or 1.5 mm, and may be a so-called SS steel material instead of a stainless steel plate. Further, the number of partition plates is not limited to three as long as it is plural, and may be two, four, five, or six. In addition, in the above-described embodiment, eight gas holes 5 are provided.
3a, 54a, 55a are the respective partition plates 53, 54,
Although an example in which the gas holes 53a and 54 are formed is shown in FIG.
The number of a and 55a may be 4, 6 or 12 as long as the sum of their areas is larger than the exhaust gas flow cross-sectional area of the exhaust pipe 16.
Eighteen or 24 gas holes 53a, 54a, 55a may be formed in each partition plate 53, 54, 55.

【００１９】更に、上述した実施の形態では、選択還元
型触媒２４上流側の排気管１６に排ガスの温度を検出す
る温度センサ４３を設け、２２０℃未満の排ガス温度を
温度センサ４３が検出したときにコントローラ４４が液
体調整弁３４をオフするような例を示したが、図４に示
すように、排ガスの温度を検出する温度センサ６３を選
択還元型触媒２４下流側の排気管１６に設けても良い。
この場合には、１７０℃未満の排ガス温度を温度センサ
６３が検出したときにコントローラ４４が液体調整弁３
４をオフし、温度センサ６３が１７０℃以上の排ガス温
度を検出した状態でコントローラ４４がポンプ３６を駆
動するとともに液体調整弁３４をオンして液体調整弁３
４における第１及び第２ポート３４ａ，３４ｂを連通さ
せるように構成することが好ましい。Further, in the above-described embodiment, the temperature sensor 43 for detecting the temperature of the exhaust gas is provided in the exhaust pipe 16 upstream of the selective reduction catalyst 24, and when the temperature sensor 43 detects the exhaust gas temperature of less than 220 ° C. Although the example in which the controller 44 turns off the liquid regulating valve 34 is shown in FIG. 4, a temperature sensor 63 for detecting the temperature of the exhaust gas is provided in the exhaust pipe 16 downstream of the selective reduction catalyst 24 as shown in FIG. Is also good.
In this case, when the temperature sensor 63 detects an exhaust gas temperature of less than 170 ° C., the controller 44 causes the liquid adjustment valve 3
4, the controller 44 drives the pump 36 while the temperature sensor 63 detects the exhaust gas temperature of 170 ° C. or higher, and the liquid adjusting valve 34 is turned on to turn on the liquid adjusting valve 3
It is preferable that the first and second ports 34a and 34b of No. 4 are connected.

【００２０】[0020]

【実施例】次に本発明の実施例を比較例とともに詳しく
説明する。 ＜実施例１＞図１に示すように、８０００ｃｃのターボ
過給機付ディーゼルエンジン１１の排気管１６に選択還
元型触媒２４を設けた。また触媒２４の排ガス上流側の
排気管１６には尿素系液体３２を噴射可能な液体噴射ノ
ズル２９を設けた。そして液体噴射ノズル２９と選択還
元型触媒２４の間の排気管１６に、図２に示すような構
成のミキサ５１を設けた。なお、上記触媒２４は、銅ゼ
オライトから成るものを使用した。 ＜比較例１＞図示しないが８０００ｃｃのターボ過給機
付ディーゼルエンジンの排気管に、実施例１と同一の選
択還元型触媒２４及び液体噴射ノズル２９を設けたが、
ミキサは設けなかった。EXAMPLES Next, examples of the present invention will be described in detail together with comparative examples. <Embodiment 1> As shown in FIG. 1, a selective reduction catalyst 24 was provided in the exhaust pipe 16 of a 8000 cc turbocharged diesel engine 11. Further, the exhaust pipe 16 on the exhaust gas upstream side of the catalyst 24 is provided with a liquid injection nozzle 29 capable of injecting the urea liquid 32. Then, the mixer 51 having the structure shown in FIG. 2 is provided in the exhaust pipe 16 between the liquid injection nozzle 29 and the selective reduction catalyst 24. The catalyst 24 was made of copper zeolite. <Comparative Example 1> Although not shown, the same selective reduction catalyst 24 and liquid injection nozzle 29 as in Example 1 were provided in the exhaust pipe of a 8000 cc diesel engine with a turbocharger.
No mixer was provided.

【００２１】＜比較試験１及び評価＞実施例１及び比較
例１の排ガス浄化装置によるＮＯｘ低減率を、触媒入口
温度を２００〜５００℃に変化させてそれぞれ測定し
た。その結果を図３に示す。図３から明らかなように、
液体噴射ノズル２９と選択還元型触媒２４の間の排気管
１６にミキサ５１を設けた実施例１における排ガス浄化
装置では、ミキサを設けない比較例１の排ガス浄化装置
に比較してＮＯｘ低減率を向上できることが判る。これ
は、ミキサ５１を設けることにより排ガス中に噴射され
た尿素系液体３２が排ガスに混合されて選択還元型触媒
２４に均一に到達したことに起因するものと考えられ
る。<Comparative Test 1 and Evaluation> The NOx reduction rates by the exhaust gas purifying apparatuses of Example 1 and Comparative Example 1 were measured while changing the catalyst inlet temperature to 200 to 500 ° C. The result is shown in FIG. As is clear from FIG.
The exhaust gas purifying apparatus according to the first embodiment in which the mixer 51 is provided in the exhaust pipe 16 between the liquid injection nozzle 29 and the selective reduction catalyst 24 has a NOx reduction rate higher than that of the exhaust gas purifying apparatus in Comparative Example 1 in which the mixer is not provided. It turns out that it can be improved. It is considered that this is because the provision of the mixer 51 causes the urea-based liquid 32 injected into the exhaust gas to be mixed with the exhaust gas and uniformly reach the selective reduction catalyst 24.

【００２２】[0022]

【発明の効果】以上述べたように、本発明によれば、液
体噴射ノズルから噴射された液体を排ガスに混合可能に
構成されたミキサを液体噴射ノズルと選択還元型触媒の
間の排気管に設けたので、ミキサを通過した段階で排ガ
スに十分に混合された尿素系液体は選択還元型触媒に均
一に到達する。この結果、尿素系液体が加水分解して生
じるアンモニアも均一になり、アンモニアの全てがＮＯ
ｘを還元させる還元反応に用いられ、ＮＯｘ排出量を従
来よりも低減するとともにアンモニアが大気中に排出さ
れるのを有効に防止することができる。この場合、ミキ
サが、軸線方向に排ガスを通過可能な筒部を有するミキ
サ本体と、筒部の内部の排ガスの通過を遮るようにミキ
サ本体に所定の間隔をあけて設けられ複数のガス孔がそ
れぞれ形成された複数枚の仕切板とを備え、複数のガス
孔は隣接する仕切板に形成された複数のガス孔と筒部の
軸線方向に重ならないように複数の仕切板にそれぞれ形
成されたものであれば、ミキサでに流入した排ガスは複
数の仕切板にそれぞれ形成された複数のガス孔を蛇行し
て通過し、排ガスが蛇行して進むことにより、その排ガ
ス中に噴射された尿素系液体を十分に排ガスと混合する
ことが可能になる。As described above, according to the present invention, the mixer configured to mix the liquid injected from the liquid injection nozzle with the exhaust gas is provided in the exhaust pipe between the liquid injection nozzle and the selective reduction catalyst. Since it is provided, the urea-based liquid sufficiently mixed with the exhaust gas reaches the selective reduction catalyst evenly after passing through the mixer. As a result, the ammonia produced by hydrolysis of the urea-based liquid becomes uniform, and all of the ammonia is NO.
It is used in a reduction reaction for reducing x, and can reduce the NOx emission amount as compared with the conventional one and can effectively prevent ammonia from being emitted into the atmosphere. In this case, the mixer has a plurality of gas holes provided at a predetermined interval in the mixer body so as to block passage of the exhaust gas inside the cylinder body, and a mixer body having a cylinder portion capable of passing exhaust gas in the axial direction. A plurality of partition plates formed respectively are provided, and the plurality of gas holes are respectively formed in the plurality of partition plates so as not to overlap with the plurality of gas holes formed in the adjacent partition plates in the axial direction of the tubular portion. If the exhaust gas flows into the mixer, the exhaust gas meanders through a plurality of gas holes formed in each of the partition plates, and the exhaust gas meanders and progresses, so that the urea system injected into the exhaust gas It is possible to mix the liquid well with the exhaust gas.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明実施形態のエンジンの排ガス浄化装置を
示す構成図。FIG. 1 is a configuration diagram showing an exhaust gas purifying apparatus for an engine according to an embodiment of the present invention.

【図２】そのミキサの構成図。FIG. 2 is a configuration diagram of the mixer.

【図３】そのミキサの有無の相違によるＮＯｘ低減率の
相違を示す図。FIG. 3 is a diagram showing a difference in NOx reduction rate due to the presence or absence of the mixer.

【図４】本発明の別のエンジンの排ガス浄化装置を示す
構成図。FIG. 4 is a configuration diagram showing another engine exhaust gas purification apparatus of the present invention.

【符号の説明】[Explanation of symbols]

１１ ディーゼルエンジン １６ 排気管 ２４ 選択還元型触媒 ２９ 液体噴射ノズル ３２ 尿素系液体 ５１ ミキサ ５２ ミキサ本体 ５２ａ 筒部 ５３，５４，５５ 仕切板 ５３ａ，５４ａ，５５ａ ガス孔 11 diesel engine 16 Exhaust pipe 24 Selective reduction catalyst 29 Liquid injection nozzle 32 Urea liquid 51 mixer 52 Mixer body 52a tube 53,54,55 Partition plate 53a, 54a, 55a Gas holes

───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3G091 AA10 AA18 AA28 AB05 BA14 CA13 CA17 CA27 DA01 DA02 DB10 EA01 EA03 EA17 GB01W GB09X GB10X HA37 HB06 4D048 AA06 AB02 AC03 BA11X BA35X CC23 CC38 CC61   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3G091 AA10 AA18 AA28 AB05 BA14                       CA13 CA17 CA27 DA01 DA02                       DB10 EA01 EA03 EA17 GB01W                       GB09X GB10X HA37 HB06                 4D048 AA06 AB02 AC03 BA11X                       BA35X CC23 CC38 CC61

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 エンジン(11)の排気管(16)に設けられた
選択還元型触媒(24)と、前記選択還元型触媒(24)より排
ガス上流側の排気管(16)に設けられ前記選択還元型触媒
(24)に向けて尿素系液体(32)を噴射可能な液体噴射ノズ
ル(29)とを備えた排ガス浄化装置において、 前記液体噴射ノズル(29)から噴射された前記液体(32)を
排ガスに混合可能に構成されたミキサ(51)が前記液体噴
射ノズル(29)と前記選択還元型触媒(24)の間の前記排気
管(16)に設けられたことを特徴とするエンジンの排ガス
浄化装置。1. A selective reduction catalyst (24) provided on an exhaust pipe (16) of an engine (11), and an exhaust pipe (16) provided on an exhaust gas upstream side of the selective reduction catalyst (24), Selective reduction type catalyst
In an exhaust gas purifying apparatus having a liquid injection nozzle (29) capable of injecting a urea liquid (32) toward (24), the liquid (32) injected from the liquid injection nozzle (29) is used as exhaust gas. An exhaust gas purifying apparatus for an engine, characterized in that a mixer (51) configured to be mixable is provided in the exhaust pipe (16) between the liquid injection nozzle (29) and the selective reduction catalyst (24). . 【請求項２】 ミキサ(51)が、軸線方向に排ガスを通過
可能な筒部(52a)を有するミキサ本体(52)と、前記筒部
(52a)の内部の排ガスの通過を遮るように前記ミキサ本
体(52)に所定の間隔をあけて設けられ複数のガス孔(53
a,54a,55a)がそれぞれ形成された複数枚の仕切板(53,5
4,55)とを備え、 前記複数のガス孔(53a,54a,55a)は隣接する前記仕切板
(53,54,55)に形成された複数のガス孔(53a,54a,55a)と
前記筒部(52a)の軸線方向に重ならないように前記複数
の仕切板(53,54,55)にそれぞれ形成された請求項１記載
のエンジンの排ガス浄化装置。2. A mixer main body (52) having a tubular portion (52a) capable of passing exhaust gas in an axial direction, and the tubular portion.
A plurality of gas holes (53) are provided in the mixer body (52) at predetermined intervals so as to block passage of exhaust gas inside the (52a).
a, 54a, 55a) with a plurality of partition plates (53, 5a)
4, 55), the plurality of gas holes (53a, 54a, 55a) are adjacent to the partition plate
(53, 54, 55) a plurality of gas holes (53a, 54a, 55a) formed in the plurality of partition plates (53, 54, 55) so as not to overlap in the axial direction of the tubular portion (52a) The exhaust gas purifying apparatus for an engine according to claim 1, which is formed respectively.
JP2002032385A 2002-02-08 2002-02-08 Exhaust emission control device for engine Pending JP2003232218A (en)

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