JP2002213233A - Exhaust emission control structure of engine - Google Patents

Exhaust emission control structure of engine

Info

Publication number
JP2002213233A
JP2002213233A JP2001005814A JP2001005814A JP2002213233A JP 2002213233 A JP2002213233 A JP 2002213233A JP 2001005814 A JP2001005814 A JP 2001005814A JP 2001005814 A JP2001005814 A JP 2001005814A JP 2002213233 A JP2002213233 A JP 2002213233A
Authority
JP
Japan
Prior art keywords
exhaust gas
exhaust
reducing agent
engine
mixing
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.)
Granted
Application number
JP2001005814A
Other languages
Japanese (ja)
Other versions
JP4445137B2 (en
Inventor
Yasuyuki Onodera
康之 小野寺
Yoshiki Kanzaki
芳樹 神崎
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP2001005814A priority Critical patent/JP4445137B2/en
Publication of JP2002213233A publication Critical patent/JP2002213233A/en
Application granted granted Critical
Publication of JP4445137B2 publication Critical patent/JP4445137B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To provide the exhaust emission control structure of an engine where an injected reducing agent is uniformly diffused in exhaust gas to further reduce NOx concentration in exhaust gas by effecting reducing reaction with high efficiency. SOLUTION: A throttle part is situated in an exhaust pipe and a low pressure state is generated locally at a high flow velocity, vaporization of the reducing agent is promoted or turbulence is caused to occur by situating an agitating member in the exhaust pipe. By promoting agitation of a flow of exhaust gas, the reducing agent is uniformly diffused in exhaust gas.

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、エンジン、特にデ
ィーゼルエンジンの排気浄化構造に係わり、特には、そ
の改良構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying structure of an engine, particularly a diesel engine, and more particularly to an improved structure thereof.

【０００２】[0002]

【従来の技術】エンジン、特にディーゼルエンジンの排
気浄化のために、還元剤及び触媒を用いて排気中の窒素
酸化物（以下ＮＯｘと呼称）を還元する技術が、種々考
案・実施されている。これらは、排気中に例えば燃料又
は尿素水といった液体を還元剤として噴射し、噴射位置
の下流側に保持した触媒の表面で、排気中のＮＯｘを還
元剤で還元して窒素（Ｎ２）にする技術である。2. Description of the Related Art Various technologies for reducing nitrogen oxides (hereinafter referred to as NOx) in exhaust gas using a reducing agent and a catalyst have been devised and implemented for purifying the exhaust gas of an engine, particularly a diesel engine. They inject, for example, a liquid such as fuel or urea water into the exhaust gas as a reducing agent, and reduce NOx in the exhaust gas with a reducing agent to nitrogen (N 2 ) on the surface of the catalyst held downstream of the injection position. Technology.

【０００３】[0003]

【発明が解決しようとする課題】ここで問題が生じる。
還元反応を効果的に起こすには、還元剤を排気中に均一
に拡散させることが望ましい。だが、還元剤を排気中に
噴射するだけでは、均一に拡散させることが困難であ
る。すなわち、還元剤の薄い部分と濃い部分とのむらが
排気中に生じ易い。還元剤の薄い雰囲気中では還元反応
が充分に行なわれないまま、多量のＮＯｘが大気中に排
出される。また還元剤の濃い雰囲気中では還元反応に用
いられなかった余分の還元剤が触媒表面を覆ったまま固
着してしまい、触媒の性能を劣化させる。いずれにせ
よ、還元剤のむらは、還元剤と触媒とによるＮＯｘ還元
反応を阻害する因となる。A problem arises here.
In order to effectively cause the reduction reaction, it is desirable that the reducing agent is uniformly diffused in the exhaust gas. However, it is difficult to uniformly diffuse the reducing agent only by injecting it into the exhaust gas. That is, unevenness between a thin portion and a thick portion of the reducing agent is likely to occur in the exhaust gas. In an atmosphere where the reducing agent is thin, a large amount of NOx is discharged into the atmosphere without a sufficient reduction reaction. Further, in an atmosphere where the reducing agent is rich, excess reducing agent not used in the reduction reaction is fixed while covering the catalyst surface, and deteriorates the performance of the catalyst. In any case, the unevenness of the reducing agent causes inhibition of the NOx reduction reaction by the reducing agent and the catalyst.

【０００４】本発明は上記従来の問題点に着目し、還元
剤と触媒とによるＮＯｘ還元反応を効果的に行うべく、
噴射した還元剤を排気中に均一に拡散させるような、エ
ンジンの排気浄化構造を提供するものである。The present invention focuses on the above-mentioned conventional problems, and aims at effectively performing a NOx reduction reaction by a reducing agent and a catalyst.
An object of the present invention is to provide an exhaust gas purifying structure of an engine that uniformly diffuses the injected reducing agent into exhaust gas.

【０００５】[0005]

【課題を解決するための手段および作用効果】上記目的
を達成するために本発明は、エンジンからの排気に含ま
れるＮＯｘを還元する還元剤を排気中に混入する混入部
を排気管内に有すると共に、混入部から下流位置なる排
気管内に還元剤の還元機能を促進する触媒を保持する保
持部を有し、排気を浄化するエンジンの排気浄化構造に
おいて、混入部から保持部までの間における排気管内の
部位に、排気流れの断面積を縮小する絞り部を有し、排
気を浄化したことを特徴とする。また、絞り部から保持
部までの間における排気管内の部位に、排気流れの断面
積の漸増し拡大する拡大部を加設してもよい。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an exhaust pipe having a mixing portion for mixing a reducing agent for reducing NOx contained in exhaust gas from an engine into the exhaust gas. An exhaust pipe downstream of the mixing section, which has a holding section for holding a catalyst that promotes a reducing function of the reducing agent, in an exhaust gas purification structure of an engine for purifying exhaust gas, wherein an exhaust pipe between the mixing section and the holding section is provided. Is characterized in that a narrowed portion for reducing the cross-sectional area of the exhaust gas flow is provided at the portion, and the exhaust gas is purified. Further, an enlarged portion that gradually increases and expands the cross-sectional area of the exhaust gas flow may be provided at a portion in the exhaust pipe between the throttle portion and the holding portion.

【０００６】別な構成として、エンジンからの排気に含
まれるＮＯｘを還元する還元剤を排気中に混入する混入
部を排気管内に有すると共に、混入部から下流位置なる
排気管内に還元剤の還元機能を促進する触媒を保持する
保持部を有し、排気を浄化するエンジンの排気浄化構造
において、混入部から保持部までの間における排気管内
の部位に、排気を攪拌して保持部へ流す攪拌部を有し、
排気を浄化したことを特徴とする。As another configuration, a mixing portion for mixing a reducing agent for reducing NOx contained in exhaust gas from the engine into the exhaust gas is provided in the exhaust pipe, and a reducing agent reducing function is provided in the exhaust pipe located downstream from the mixing portion. An exhaust gas purifying structure for an engine having a holding unit for holding a catalyst for promoting exhaust gas, and for purifying exhaust gas, an agitating unit for agitating exhaust gas to flow to the holding unit in a portion in an exhaust pipe between the mixing unit and the holding unit. Has,
The exhaust gas has been purified.

【０００７】排気流れの中に還元剤を噴霧状態で混入さ
せると還元剤の粒子の大きさに分布があるものとなる。
排気管を絞り部に向かって絞っていくと排気流れは増速
していく。すると還元剤の粒子のうち小さく軽いものは
排気流れについていくが、粒子のうち大きく重いものは
排気の速度変化についていき難いため遅れて流れてい
く。このため還元剤の粒子の小さいものと粒子の大きい
ものとが前後で入れ替わり混合が促進される。また、排
気流れを絞っていくと重い粒子は辺縁部へ分布が移り、
軽い粒子は流れに乗って中心部へ集まる傾向がある。と
ころが、断面積が最小となる最小絞り部を過ぎて拡大流
れに入ると重い粒子は逆に中心部へ集まり、軽い粒子は
拡大流れに沿って流れていく。すなわち最小絞り部を境
に還元剤の大きい粒子と小さい粒子とが逆の流れ分布に
なることにより、半径方向の混合が促進される。また、
拡大流れにおいても、排気流れを絞っていくときと逆の
作用で還元剤の粒子の小さいものと粒子の大きいものと
が前後で入れ替わるため排気と還元剤との混合がより促
進される。また、絞り部では、速度増加で排気動圧が上
昇する分、排気静圧が低下する。これにより、還元剤の
気化が促進される。気化した還元剤は容易に排気中に拡
散するので、還元反応の効率が向上し、排気中のＮＯｘ
濃度をよりよく低減できる。また、その上で絞り部から
保持部までの間における排気管内の部位に断面積の漸増
する拡大部を設ければ、速度分のヘッドを損失少なく圧
力ヘッドに変えられるので絞り部による圧力損失を抑え
られ、エンジンの効率が向上する。When the reducing agent is mixed in the exhaust stream in a spray state, the particle size of the reducing agent has a distribution.
As the exhaust pipe is throttled toward the throttle, the exhaust flow increases in speed. Then, small and light particles of the reducing agent follow the exhaust flow, but large and heavy particles of the reducing agent flow with a delay because it is difficult to keep up with the change in the exhaust speed. For this reason, the small particles of the reducing agent and the large particles of the reducing agent are switched back and forth, and the mixing is promoted. Also, as the exhaust flow is reduced, the distribution of heavy particles shifts to the periphery,
Light particles tend to collect in the center in the flow. However, when entering the expanded flow past the minimum constriction where the cross-sectional area is minimized, heavy particles conversely converge on the center and lighter particles flow along the expanded flow. In other words, the mixing of particles in the radial direction is promoted by the reverse flow distribution of the large particles and the small particles of the reducing agent at the boundary of the minimum throttle portion. Also,
Also in the enlarged flow, the mixing of the exhaust gas and the reducing agent is further promoted because the small particles of the reducing agent and the large particles of the reducing agent are switched back and forth by the reverse operation of the operation of narrowing the exhaust flow. In the throttle section, the static exhaust pressure of the exhaust decreases as the dynamic pressure of the exhaust increases as the speed increases. Thereby, the vaporization of the reducing agent is promoted. Since the vaporized reducing agent easily diffuses into the exhaust gas, the efficiency of the reduction reaction is improved, and the NOx in the exhaust gas is reduced.
The concentration can be reduced better. In addition, if an enlarged portion having a gradually increasing cross-sectional area is provided at a portion in the exhaust pipe between the throttle portion and the holding portion, the pressure loss due to the throttle portion can be reduced because the head corresponding to the speed can be changed to a pressure head with less loss. Control and engine efficiency is improved.

【０００８】混入部から保持部までの間における排気管
内の部位に攪拌部を有した構成とすれば、攪拌部に乱流
が発生する。乱流の発生で排気が攪拌され、攪拌された
排気中に還元剤は容易に拡散する。したがって、効率よ
く還元反応を行って、排気中のＮＯｘ濃度をよりよく低
減できる。[0008] If a configuration is adopted in which a stirring section is provided at a position in the exhaust pipe between the mixing section and the holding section, turbulence occurs in the stirring section. The exhaust gas is agitated by the generation of the turbulence, and the reducing agent easily diffuses into the agitated exhaust gas. Therefore, the reduction reaction can be efficiently performed, and the NOx concentration in the exhaust gas can be further reduced.

【０００９】[0009]

【発明の実施の形態】以下、本発明の実施形態につい
て、図を参照して詳細に説明する。まず、第１実施形態
によるエンジンの排気浄化構造を図１に示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, an exhaust gas purifying structure of an engine according to a first embodiment is shown in FIG.

【００１０】エンジン１から伸びる排気管２内の上流側
に、ＮＯｘを還元する液体の還元剤を噴射する噴射ノズ
ル３を設け、排気管２内の下流側に、ＮＯｘと還元剤と
の還元反応を促進する触媒を内部に保持するコンバータ
４が設けてある。噴射ノズル３とコンバータ４との間に
なる排気管２内の部位に、上流側から順に絞り部５、デ
ィフューザ６を設ける。なお、還元剤には、燃料又は尿
素水などを用いる。An injection nozzle 3 for injecting a liquid reducing agent for reducing NOx is provided upstream of an exhaust pipe 2 extending from the engine 1, and a reduction reaction between NOx and the reducing agent is provided downstream of the exhaust pipe 2. A converter 4 is provided for holding a catalyst for promoting the internal combustion. A throttle unit 5 and a diffuser 6 are provided in a part of the exhaust pipe 2 between the injection nozzle 3 and the converter 4 in order from the upstream side. Note that fuel, urea water, or the like is used as the reducing agent.

【００１１】エンジン１からの排気流れは排気管２内に
て、噴射ノズル３の噴射する還元剤を加えられ、絞り部
５によってその流路面積を狭められる。次にディフュー
ザ６を通過することで、排気流れは狭められた流路面積
を徐々に回復し、それからコンバータ４に流入する。The exhaust flow from the engine 1 is added with a reducing agent injected from the injection nozzle 3 in the exhaust pipe 2, and the flow path area is reduced by the throttle unit 5. Next, by passing through the diffuser 6, the exhaust flow gradually recovers the narrowed flow passage area, and then flows into the converter 4.

【００１２】排気流れの中に還元剤を噴霧状態で混入さ
せると還元剤の粒子の大きさに分布があるものとなる。
排気管２を絞り部５に向かって絞っていくと排気流れは
増速していく。すると還元剤の粒子のうち小さく軽いも
のは排気流れについていくが、粒子のうち大きく重いも
のは排気の速度変化についていき難いため遅れて流れて
いく。このため還元剤の粒子の小さいものと粒子の大き
いものとが前後で入れ替わり混合が促進される。また、
排気流れを絞っていくと重い粒子は辺縁部へ分布が移
り、軽い粒子は流れに乗って中心部へ集まる傾向があ
る。ところが、断面積が最小となる最小絞り部を過ぎて
拡大流れに入ると重い粒子は逆に中心部へ集まり、軽い
粒子は拡大流れに沿って流れていく。すなわち最小絞り
部を境に還元剤の大きい粒子と小さい粒子とが逆の流れ
分布になることにより、半径方向の混合が促進される。
また、拡大流れにおいても、排気流れを絞っていくとき
と逆の作用で還元剤の粒子の小さいものと粒子の大きい
ものとが前後で入れ替わるため排気と還元剤との混合が
より促進される。また、絞り部５では、速度増加で排気
動圧が上昇する分、排気静圧が低下する。これにより、
還元剤の気化が促進される。気化した還元剤は容易に排
気中に拡散するので、還元反応の効率が向上し、排気中
のＮＯｘ濃度をよりよく低減できる。また、その上で絞
り部５からコンバータ４までの間に断面積の漸増するデ
ィフューザ６を設けたことで、速度分のヘッドを損失少
なく圧力ヘッドに変えられるので絞り部による圧力損失
を抑えられ、エンジンの効率が向上する。When the reducing agent is mixed in the exhaust stream in a spray state, the particle size of the reducing agent has a distribution.
As the exhaust pipe 2 is throttled toward the throttle section 5, the exhaust flow speed increases. Then, small and light particles of the reducing agent follow the exhaust flow, but large and heavy particles of the reducing agent flow with a delay because it is difficult to keep up with the change in the exhaust speed. For this reason, the small particles of the reducing agent and the large particles of the reducing agent are switched back and forth, and the mixing is promoted. Also,
As the exhaust flow is throttled, the distribution of heavy particles shifts to the periphery, while lighter particles tend to gather in the center along the flow. However, when entering the expanded flow past the minimum constriction where the cross-sectional area is minimized, heavy particles conversely converge on the center and lighter particles flow along the expanded flow. In other words, the mixing of particles in the radial direction is promoted by the reverse flow distribution of the large particles and the small particles of the reducing agent at the boundary of the minimum throttle portion.
Also, in the enlarged flow, the mixture of the exhaust gas and the reducing agent is further promoted because the small particles of the reducing agent and the large particles of the reducing agent are switched back and forth by the opposite operation to that of narrowing the exhaust flow. Further, in the throttle section 5, the exhaust static pressure decreases by an amount corresponding to the increase in the exhaust dynamic pressure due to the increase in the speed. This allows
Vaporization of the reducing agent is promoted. Since the vaporized reducing agent easily diffuses into the exhaust gas, the efficiency of the reduction reaction is improved, and the NOx concentration in the exhaust gas can be further reduced. In addition, by providing the diffuser 6 having a gradually increasing cross-sectional area between the throttle unit 5 and the converter 4 on the top thereof, the head loss corresponding to the speed can be changed to a pressure head with less loss, so that the pressure loss due to the throttle unit can be suppressed, Engine efficiency is improved.

【００１３】コンバータ４内の触媒表面で、還元剤は排
気中のＮＯｘと反応し、ＮＯｘから酸素を奪う。ＮＯｘ
は酸素を奪われ、窒素（Ｎ２）となって大気中に流出す
る。すなわち、ＮＯｘの還元反応が起こる。On the catalyst surface in the converter 4, the reducing agent reacts with NOx in the exhaust gas and deprives NOx of oxygen. NOx
Is deprived of oxygen and becomes nitrogen (N 2 ) and flows out to the atmosphere. That is, a reduction reaction of NOx occurs.

【００１４】上記の通り第１実施形態によれば、絞り部
を設けたことで還元剤の気化が促進されるので、還元剤
は排気中へ均一に拡散した状態でコンバータに流入す
る。したがって還元反応は排気流れ全体にわたって万遍
なく起こり、排気中のＮＯｘ濃度をよりよく低減でき
る。また、絞り部の下流にディフューザを設けたので、
絞り部による排気の圧力損失を抑えられ、エンジンの効
率が低下することを防止できる。As described above, according to the first embodiment, since the vaporization of the reducing agent is promoted by providing the throttle portion, the reducing agent flows into the converter in a state of being uniformly diffused in the exhaust gas. Therefore, the reduction reaction occurs uniformly throughout the exhaust gas flow, and the NOx concentration in the exhaust gas can be further reduced. Also, a diffuser is provided downstream of the throttle,
The pressure loss of the exhaust gas due to the throttle portion can be suppressed, and the efficiency of the engine can be prevented from lowering.

【００１５】次に、第２実施形態によるディーゼルエン
ジンの排気浄化構造を図２に示す。第１実施形態との共
通部分については同一符号を付し、説明を省く。Next, FIG. 2 shows an exhaust gas purifying structure of a diesel engine according to a second embodiment. Parts common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

【００１６】噴射ノズル３とコンバータ４との間になる
排気管２内の部位に、第１実施形態の絞り部５及びディ
フューザ６に代えて、排気流れを横切る方向に差し渡し
た棒状の部材７を複数設ける。エンジン１からの排気流
れは排気管２内にて、噴射ノズル３の噴射する還元剤を
加えられ、部材７に衝突して乱流となる。乱流となるこ
とで排気は攪拌され、排気中の還元剤は均一に拡散す
る。それから排気はコンバータ４に流入し、コンバータ
４内の触媒表面で、ＮＯｘの還元反応が起こる。In place of the throttle section 5 and the diffuser 6 of the first embodiment, a rod-shaped member 7 extending in a direction crossing the exhaust flow is provided at a position in the exhaust pipe 2 between the injection nozzle 3 and the converter 4. Provide a plurality. The exhaust gas from the engine 1 is added with the reducing agent injected from the injection nozzle 3 in the exhaust pipe 2 and collides with the member 7 to be turbulent. The turbulent flow stirs the exhaust gas, and the reducing agent in the exhaust gas diffuses uniformly. Then, the exhaust gas flows into the converter 4, and a reduction reaction of NOx occurs on a catalyst surface in the converter 4.

【００１７】上記の通り第２実施形態によれば、排気流
れを横切る部材を設けたことで乱流が生じ、排気は攪拌
されるので還元剤は排気中へ均一に拡散する。したがっ
て還元反応は排気流れ全体にわたって万遍なく起こり、
排気中のＮＯｘ濃度をよりよく低減できる。As described above, according to the second embodiment, turbulence is generated by providing a member that crosses the exhaust gas flow, and the exhaust gas is agitated, so that the reducing agent is uniformly diffused into the exhaust gas. Thus, the reduction reaction occurs evenly throughout the exhaust stream,
The NOx concentration in the exhaust can be reduced better.

【００１８】なお、排気を攪拌する上記作用は排気流れ
が部材に衝突して乱流となることで得られるものだか
ら、排気流れに対する障害物となりさえすれば、部材の
形状及び個数は特に制約されない。例えば図２中に矢印
で引き出したように、孔の空いた板状の部材を並べたも
のでもよい。Since the above-mentioned action of stirring the exhaust gas is obtained by the turbulent flow of the exhaust gas colliding with the members, the shape and number of the members are not particularly limited as long as they become obstacles to the exhaust flow. . For example, a plate-like member having holes may be arranged as shown by an arrow in FIG.

【００１９】以上説明したように本発明によれば、排気
管内に絞り部を設けて局所的に高流速で低圧の状態を造
り、還元剤の気化を促すか、又は排気管内に攪拌部材を
設けて乱流を起こし、排気流れの攪拌を促すかして、排
気中に還元剤を均一に拡散させられる。したがって、効
率よく還元反応を行って、排気中のＮＯｘ濃度をよりよ
く低減できる。As described above, according to the present invention, a throttle portion is provided in the exhaust pipe to locally create a low pressure state at a high flow rate, thereby promoting the vaporization of the reducing agent, or providing a stirring member in the exhaust pipe. As a result, the reducing agent is diffused uniformly in the exhaust gas by causing a turbulent flow and promoting the stirring of the exhaust flow. Therefore, the reduction reaction can be efficiently performed, and the NOx concentration in the exhaust gas can be further reduced.

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

【図１】本発明の第１実施形態に係るエンジンの排気浄
化構造の図である。FIG. 1 is a diagram of an engine exhaust purification structure according to a first embodiment of the present invention.

【図２】本発明の第２実施形態に係るエンジンの排気浄
化構造の図である。FIG. 2 is a view of an exhaust gas purification structure for an engine according to a second embodiment of the present invention.

【符号の説明】 １…エンジン、２…排気管、３…噴射ノズル、４…コン
バータ、５…絞り部、６…ディフューザ、７…部材。[Description of Signs] 1 ... engine, 2 ... exhaust pipe, 3 ... injection nozzle, 4 ... converter, 5 ... throttle section, 6 ... diffuser, 7 ... member.

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 エンジンからの排気に含まれるＮＯｘを
還元する還元剤を排気中に混入する混入部を排気管内に
有すると共に、 混入部から下流位置なる排気管内に還元剤の還元機能を
促進する触媒を保持する保持部を有し、排気を浄化する
エンジンの排気浄化構造において、 混入部(3)から保持部(4)までの間における排気管(2)内
の部位に、排気流れの断面積を縮小する絞り部(5)を有
し、排気を浄化したことを特徴とするエンジンの排気浄
化構造。An exhaust pipe includes a mixing portion that mixes a reducing agent that reduces NOx contained in exhaust gas from the engine into the exhaust gas, and promotes a reducing agent reducing function in an exhaust pipe positioned downstream from the mixing portion. In an exhaust purification structure of an engine that has a holding part for holding a catalyst and purifies exhaust gas, a part of the exhaust pipe (2) between the mixing part (3) and the holding part (4) has an exhaust flow cutoff. An exhaust gas purification structure for an engine, comprising a throttle section (5) for reducing the area and purifying exhaust gas. 【請求項２】 絞り部(5)から保持部(4)までの間におけ
る排気管(2)内の部位に、排気流れの断面積の漸増し拡
大する拡大部(6)を加設したことを特徴とする請求項１
記載のエンジンの排気浄化構造。2. An enlarged portion (6) for gradually increasing and increasing the cross-sectional area of the exhaust flow is provided at a portion in the exhaust pipe (2) between the throttle portion (5) and the holding portion (4). Claim 1 characterized by the following:
The exhaust purification structure of the engine described in the above. 【請求項３】 エンジンからの排気に含まれるＮＯｘを
還元する還元剤を排気中に混入する混入部を排気管内に
有すると共に、 混入部から下流位置なる排気管内に還元剤の還元機能を
促進する触媒を保持する保持部を有し、排気を浄化する
エンジンの排気浄化構造において、 混入部(3)から保持部(4)までの間における排気管(2)内
の部位に、排気を攪拌して保持部(4)へ流す攪拌部(7)を
有し、排気を浄化したことを特徴とするエンジンの排気
浄化構造。3. An exhaust pipe having a mixing section for mixing a reducing agent for reducing NOx contained in exhaust gas from the engine into the exhaust gas, and promoting a reducing agent reducing function in the exhaust pipe located downstream from the mixing section. In an exhaust purification structure of an engine having a holding portion for holding a catalyst and purifying exhaust gas, exhaust gas is agitated at a portion in an exhaust pipe (2) between a mixing portion (3) and a holding portion (4). An exhaust gas purifying structure for an engine, comprising: a stirring section (7) for flowing to a holding section (4) to purify exhaust gas.
JP2001005814A 2001-01-12 2001-01-12 Engine exhaust purification structure Expired - Fee Related JP4445137B2 (en)

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