JPH0586846A - Exhaust emission control device for engine - Google Patents

Exhaust emission control device for engine

Info

Publication number
JPH0586846A
JPH0586846A JP3270262A JP27026291A JPH0586846A JP H0586846 A JPH0586846 A JP H0586846A JP 3270262 A JP3270262 A JP 3270262A JP 27026291 A JP27026291 A JP 27026291A JP H0586846 A JPH0586846 A JP H0586846A
Authority
JP
Japan
Prior art keywords
reaction chamber
exhaust
side reaction
engine
exhaust gas
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
JP3270262A
Other languages
Japanese (ja)
Other versions
JP2814322B2 (en
Inventor
Koichi Sugawara
光一 菅原
Yoshitaka Koiso
慶高 小磯
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP3270262A priority Critical patent/JP2814322B2/en
Publication of JPH0586846A publication Critical patent/JPH0586846A/en
Application granted granted Critical
Publication of JP2814322B2 publication Critical patent/JP2814322B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • F01N13/08Other arrangements or adaptations of exhaust conduits
    • F01N13/10Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • 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
    • F01N3/30Arrangements for supply of additional air
    • F01N3/34Arrangements for supply of additional air using air conduits or jet air pumps, e.g. near the engine exhaust port
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

PURPOSE:To remove poisonous material such as NOx, CO, HC effectively even under conditions that an air-fuel ratio ranges comparatively wide in an exhaust emission control device for engine. CONSTITUTION:A catalyst converter 2 is prepared by communicating a left side reaction chamber 3 with a right side reaction chamber 4 through a narrow path 5. An exhaust inlet is opened to the left side reaction chamber 3, while an exhaust outlet opened to the right side reaction chamber 4. The narrow path 5 is communicated with atmosphere through an air passage 8. A catalytic oxidation reactor 10 is housed in the left side reaction chamber 3, while a catalytic oxidation reactor 12 housed in the right side reaction chamber 4. Namely, purification reactor of the exhaust is divided into steps of catalytic oxidation reaction and catalytic reduction reaction. In the right side reaction chamber 4 where reduction is performed, densities of CO and HC to be removed are decreased through Venturi effect of the narrow path 5. It is therefore possible to remove poisonous material included in the exhaust effectively even under conditions that an air-fuel ratio ranges comparatively wide.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、エンジンの排気浄化装
置に関し、空燃比の比較的広い条件下でも窒素酸化物
(NOx)、一酸化炭素(CO)、炭化水素(HC)などを効
率良く除去できるものを提供する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine exhaust gas purification apparatus, and nitrogen oxides even under a relatively wide air-fuel ratio condition.
Provided is one capable of efficiently removing (NOx), carbon monoxide (CO), hydrocarbon (HC) and the like.

【0002】[0002]

【従来の技術】本発明の対象となるエンジンの排気浄化
装置の基本構造は、図1に示すように、エンジンEの排
気路1に触媒コンバータ2を介装し、排気中の窒素酸化
物、一酸化炭素、炭化水素などを触媒コンバータ2で除
去するように構成した形式のものである。
2. Description of the Related Art As shown in FIG. 1, the basic structure of an engine exhaust gas purifying apparatus to which the present invention is applied is such that a catalytic converter 2 is provided in an exhaust passage 1 of an engine E and nitrogen oxides in the exhaust gas, It is of a type configured to remove carbon monoxide, hydrocarbons, etc. by the catalytic converter 2.

【0003】この形式の従来技術としては、触媒コンバ
ータ2が三元触媒コンバータであって、白金、ロジウ
ム、パラジウムなどの貴金属を触媒として、排気中の有
害物質同士、即ち、酸化剤であるNOx、O2と、還元剤
であるCO、HCとを互いに反応させて、酸化と還元を
同時に行わせてN2、CO2、H2Oなどの無害ガスに変換
するようにしたものがある。
As a conventional technique of this type, the catalytic converter 2 is a three-way catalytic converter, in which noxious metals such as platinum, rhodium and palladium are used as catalysts, and harmful substances in the exhaust gas, that is, NOx which is an oxidant, There is one in which O 2 and reducing agents CO and HC are made to react with each other so that they are simultaneously oxidized and reduced to be converted into harmless gases such as N 2 , CO 2 and H 2 O.

【0004】[0004]

【発明が解決しようとする課題】上記従来技術の三元触
媒は、図3に示すように、理論空燃比付近の狭い範囲A
でエンジンを運転しないと、排気中の酸化剤と還元剤と
が化学量論的に等量に近くならないので、上記有害物質
を効率良く除去できない。このため、ディーゼルエンジ
ンでは、O2センサーと電子制御燃料噴射機構を組み合
わせて、空燃比を時々刻々とフィードバックさせる特別
のシステムが必要になり、コストが高くなる。本発明
は、空燃比がある程度変動しても排気中の有害物質を効
率良く除去することを技術的課題とする。
As shown in FIG. 3, the above-mentioned conventional three-way catalyst has a narrow range A near the theoretical air-fuel ratio.
If the engine is not operated in, the oxidant and the reducing agent in the exhaust gas will not be stoichiometrically close to each other in stoichiometry, so that the harmful substances cannot be removed efficiently. Therefore, in the diesel engine, a special system that combines an O 2 sensor and an electronically controlled fuel injection mechanism to feed back the air-fuel ratio momentarily is required, resulting in high cost. An object of the present invention is to efficiently remove harmful substances in exhaust gas even if the air-fuel ratio fluctuates to some extent.

【0005】[0005]

【課題を解決するための手段】上記課題を達成するため
の手段を、実施例を示す図面により以下に説明する。即
ち、本発明は、前記基本構造のエンジンの排気浄化装置
において、上記触媒コンバータ2は、上手側反応室3と
下手側反応室4とを狭隘路5を介して連通して構成さ
れ、上手側反応室3に排気入口6を、下手側反応室4に
排気出口7を各々開口し、狭隘路5を通気路8を介して
外気に連通して、上記上手側反応室3を還元触媒反応器
10を介して排気入口6に臨ませ、下手側反応室4を酸
化触媒反応器12を介して排気出口7に臨ませることを
特徴とするものである。
Means for achieving the above object will be described below with reference to the drawings illustrating an embodiment. That is, according to the present invention, in the exhaust gas purifying apparatus for an engine having the basic structure, the catalytic converter 2 is constituted by connecting the upper reaction chamber 3 and the lower reaction chamber 4 through the narrow path 5, An exhaust inlet 6 is opened in the reaction chamber 3 and an exhaust outlet 7 is opened in the lower reaction chamber 4, and the narrow passage 5 is communicated with the outside air through a ventilation passage 8 to bring the upper reaction chamber 3 into a reduction catalytic reactor. It is characterized in that it faces the exhaust inlet 6 via 10 and the lower reaction chamber 4 faces the exhaust outlet 7 via the oxidation catalyst reactor 12.

【0006】上記還元触媒反応器10とは、主に排気中
のNOxを還元するためのもので、例えば、排気中のC
Oなどの成分を還元剤として触媒の存在下に接触還元分
解したり、アンモニアを還元剤とし、銅、鉄などの酸化
物を触媒として接触還元分解する反応器の外、吸着式や
湿式反応方式のものを広く含む。上記酸化触媒反応器1
2とは、主に排気中のCOやHCを酸化するためのもの
で、例えば、構造的には既存の酸化触媒コンバータなど
と同様に、粒状或は格子状のアルミナなどに、触媒作用
をする白金やパラジウムなどの貴金属を担持した反応器
の外、吸着式や吸収式のものなどを広く含む。
The reduction catalytic reactor 10 is mainly for reducing NOx in the exhaust gas, and for example, C in the exhaust gas.
In addition to reactors that perform catalytic reductive decomposition using components such as O as a reducing agent in the presence of a catalyst, or catalytic reductive decomposition using ammonia as a reducing agent and oxides of copper, iron, etc. as catalysts, adsorption or wet reaction methods Including a wide range of things. The oxidation catalyst reactor 1
2 is mainly for oxidizing CO and HC in the exhaust gas, and, for example, structurally catalyzes granular or lattice-like alumina, similar to existing oxidation catalytic converters. In addition to reactors that carry precious metals such as platinum and palladium, adsorption and absorption types are also widely included.

【0007】[0007]

【作用】排気が排気入口6から上手側反応室3に流入す
る際に、還元触媒反応器10で排気中のNOxがN2
還元されて除去される。この場合、図2に示すように、
前述の理論空燃比の狭い範囲A(図3参照)から多少ずれ
て、空燃比の範囲Bが比較的広くなっても、NOxの濃
度変化は少ないので、この範囲でのNOxの除去に支障
はない(図2のD領域参照)。
When the exhaust gas flows into the upper reaction chamber 3 from the exhaust gas inlet 6, NOx in the exhaust gas is reduced to N 2 in the reduction catalytic reactor 10 and removed. In this case, as shown in FIG.
Even if the range A of the theoretical air-fuel ratio is slightly deviated from the range A (see FIG. 3) and the range B of the air-fuel ratio becomes relatively wide, the NOx concentration change is small, so there is no problem in removing NOx in this range. No (see area D in FIG. 2).

【0008】また、排気が上手側反応室3から狭隘路5
を通過して下手側反応室4に入る際に、狭隘路5でいわ
ゆるベンチュリ効果が起こるので、外気が通気路8を通
って下手側反応室4に吸い込まれる。このため、下手側
反応室4での排気の空燃比は希薄側に傾き、図2に示す
ように、排気中のCO及びHC濃度は空燃比領域Bの右
側境界線C上に低減する。従って、酸化触媒反応器12
ではCO及びHCが効率良くCO2やH2Oに酸化されて
除去される。但し、ベンチュリ効果で吸い込まれる外気
は大量ではないので、下手側反応室4での排気の温度低
下は少なく、酸化反応の効率が抑制される虞れはない。
Exhaust gas is discharged from the reaction chamber 3 on the upper side to the narrow path 5
The so-called Venturi effect occurs in the narrow passage 5 when entering the lower reaction chamber 4 after passing through, so that the outside air is sucked into the lower reaction chamber 4 through the ventilation passage 8. Therefore, the air-fuel ratio of the exhaust gas in the lower reaction chamber 4 leans toward the lean side, and the CO and HC concentrations in the exhaust gas are reduced to the right boundary line C of the air-fuel ratio region B as shown in FIG. Therefore, the oxidation catalyst reactor 12
Then, CO and HC are efficiently oxidized and removed into CO 2 and H 2 O. However, since a large amount of outside air is sucked in by the Venturi effect, the temperature of the exhaust gas in the lower reaction chamber 4 does not decrease so much that the efficiency of the oxidation reaction may not be suppressed.

【0009】[0009]

【発明の効果】排気の浄化反応を酸化触媒反応と還元触
媒反応の二段に分け、下手側の酸化反応室では除去対象
物質の濃度を狭隘路と通気路による外気吸い込み作用で
低減して反応効率を高めるように構成するので、空燃比
の比較的広い条件下でも排気中のNOx、CO、HCを
良好に除去できる。このため、従来の三元触媒方式に比
べて、特別な電子制御システムは要らず、安価に実施で
きる。
EFFECTS OF THE INVENTION Exhaust gas purification reaction is divided into two stages, an oxidation catalytic reaction and a reduction catalytic reaction. In the lower oxidation reaction chamber, the concentration of the substance to be removed is reduced by the action of sucking outside air through the narrow passage and the ventilation passage. Since it is configured to increase efficiency, NOx, CO, and HC in exhaust gas can be satisfactorily removed even under conditions where the air-fuel ratio is relatively wide. Therefore, as compared with the conventional three-way catalyst system, no special electronic control system is required and the system can be implemented at low cost.

【0010】[0010]

【実施例】以下、本発明の実施例を図面に基づいて述べ
る。図1はディーゼルエンジンの排気浄化装置の概略縦
断面図であって、縦型ディーゼルエンジンEの排気マニ
ホールド11の上方に触媒コンバータ2を固定し、排気
中のNOx、CO、HCなどの有害物質を触媒コンバータ
2で除去するように構成する。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic vertical cross-sectional view of an exhaust emission control device for a diesel engine, in which a catalytic converter 2 is fixed above an exhaust manifold 11 of a vertical diesel engine E to remove harmful substances such as NOx, CO and HC in exhaust gas. It is configured to be removed by the catalytic converter 2.

【0011】上記触媒コンバータ2は、ケーシング13
内に上手側反応室3と下手側反応室4とを縦向きの区画
壁14で仕切って形成され、区画壁14の下方に狭隘路
5を開放して、上手側反応室3と下手側反応室4とを狭
隘路5を介して連通する。上記触媒コンバータ2の上手
側反応室3の下部に排気入口6を、下手側反応室4の下
部に排気出口7を各々開口し、排気マニホールド11に
形成した排気導入路18を排気入口6に下から連通し、
排気出口7を排気マニホールド11に形成した排気導出
路19に上から連通する。
The catalytic converter 2 has a casing 13
It is formed by partitioning the upper side reaction chamber 3 and the lower side reaction chamber 4 by a vertically oriented partition wall 14, and a narrow path 5 is opened below the partition wall 14 to form the upper side reaction chamber 3 and the lower side reaction. It communicates with the chamber 4 via a narrow path 5. An exhaust inlet 6 is opened in the lower part of the upper reaction chamber 3 of the catalytic converter 2, an exhaust outlet 7 is opened in the lower reaction chamber 4, and an exhaust introduction passage 18 formed in the exhaust manifold 11 is connected to the exhaust inlet 6. Communication from
The exhaust outlet 7 communicates with the exhaust outlet 19 formed in the exhaust manifold 11 from above.

【0012】上記上手側反応室3に還元触媒反応器10
を収容し、当該還元触媒反応器10を介して排気入口6
を上手側反応室3内に連通するとともに、下手側反応室
4に酸化触媒反応器12を収容し、酸化触媒反応器12
を介して下手側反応室4内を排気出口7に連通する。上
記還元触媒反応器10は、主に排気中のNOxをN2
還元するためのもので、例えば、排気中のCOなどの成
分を還元剤として触媒の存在下に接触還元分解するよう
に構成される。上記酸化触媒反応器12は、主に排気中
のCOやHCをCO2やH2Oに酸化するためのもので、
例えば、構造的には既存の酸化触媒コンバータなどと同
様のものである。上記区画壁14の肉壁内に縦向きに通
気路8を貫設し、ケーシング13の上部中央に形成した
外気導入室15を通気路8を介して狭隘路5に連通し、
外気導入室15に開けた外気入口16にリード弁より成
る逆止弁17を臨ませる。
A reducing catalyst reactor 10 is provided in the reaction chamber 3 on the upper side.
And the exhaust inlet 6 through the reduction catalytic reactor 10.
Is communicated with the upper side reaction chamber 3, and the lower side reaction chamber 4 accommodates the oxidation catalyst reactor 12,
The inside of the lower reaction chamber 4 is communicated with the exhaust outlet 7 via the. The reduction catalyst reactor 10 is mainly for reducing NOx in exhaust gas to N 2 , and is configured to catalytically decompose by reducing components such as CO in exhaust gas as a reducing agent in the presence of a catalyst. To be done. The oxidation catalyst reactor 12 is mainly for oxidizing CO and HC in exhaust gas to CO 2 and H 2 O,
For example, it is structurally similar to the existing oxidation catalytic converter and the like. The ventilation passage 8 is vertically provided in the meat wall of the partition wall 14, and the outside air introduction chamber 15 formed in the upper center of the casing 13 is communicated with the narrow passage 5 through the ventilation passage 8.
A check valve 17 composed of a reed valve is made to face the outside air inlet 16 opened in the outside air introduction chamber 15.

【0013】そこで、本実施例の排気浄化装置の機能を
述べる。ディーゼルエンジンEの排気マニホールド11
の排気は、排気入口6から還元触媒コンバータ10内を
通過して上手側反応室3に流入する。この際、還元触媒
反応器10で排気中のNOxはN2に還元されて除去さ
れる。しかも、図2に示すように、空燃比の範囲Bが従
来の理論空燃比の狭い範囲A(図3参照)から多少ずれて
比較的広くなっても、NOxの濃度変化は少ないので、
この範囲でのNOxの除去に支障はない。
Therefore, the function of the exhaust gas purification apparatus of this embodiment will be described. Exhaust manifold 11 of diesel engine E
The exhaust gas passes through the exhaust gas inlet 6 through the reduction catalytic converter 10 and flows into the upper reaction chamber 3. At this time, NOx in the exhaust gas is reduced to N 2 in the reduction catalytic reactor 10 and removed. Moreover, as shown in FIG. 2, even if the range B of the air-fuel ratio becomes relatively wide with a slight deviation from the conventional range A (see FIG. 3) where the theoretical air-fuel ratio is narrow, the NOx concentration change is small,
There is no problem in removing NOx in this range.

【0014】また、排気は上手側反応室3から狭隘路5
を通過して下手側反応室4に入る場合、狭隘路5でいわ
ゆるベンチュリ効果を受け、狭隘路5の付近に負圧が発
生するので、外気が外気導入室15から通気路8を通っ
て下手側反応室4に吸い込まれる。このため、下手側反
応室4での排気の空燃比は希薄側に傾き、図2に示すよ
うに、排気中のCO及びHC濃度は空燃比範囲Bの右側
境界線C上に低減する。従って、酸化触媒反応器12で
はCO及びHCが効率良くCO2やH2Oに酸化される。
Exhaust gas is exhausted from the upper reaction chamber 3 to the narrow passage 5.
When passing through the lower side reaction chamber 4 and receiving a so-called Venturi effect in the narrow passage 5, a negative pressure is generated in the vicinity of the narrow passage 5, so that the outside air passes through the ventilation passage 8 from the outside air introduction chamber 15 It is sucked into the side reaction chamber 4. Therefore, the air-fuel ratio of the exhaust gas in the lower reaction chamber 4 leans to the lean side, and the CO and HC concentrations in the exhaust gas are reduced to the right boundary line C of the air-fuel ratio range B as shown in FIG. Therefore, CO and HC are efficiently oxidized into CO 2 and H 2 O in the oxidation catalyst reactor 12.

【0015】尚、本発明は、排気の浄化反応を酸化触媒
反応と還元触媒反応の二段に分け、狭隘路の外気吸い込
み作用で下手側の酸化反応を効率化して、空燃比の比較
的広い条件下で排気中のNOx、CO、HCを良好に除
去することを特徴とするので、ディーゼルエンジンに適
用するのがより好ましいが、ガソリンエンジンを初めと
する火花点火エンジンへの適用を排除するものではな
い。
In the present invention, the exhaust gas purification reaction is divided into two stages, that is, an oxidation catalyst reaction and a reduction catalyst reaction, and the lower side oxidation reaction is made efficient by the action of sucking the outside air through the narrow bottle, so that the air-fuel ratio is relatively wide. It is more preferable to apply to a diesel engine because it is characterized by good removal of NOx, CO, and HC in the exhaust gas under the conditions, but excludes the application to a spark ignition engine including a gasoline engine. is not.

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

【図1】ディーゼルエンジンの排気浄化装置の概略縦断
面図である。
FIG. 1 is a schematic vertical sectional view of an exhaust emission control device for a diesel engine.

【図2】本発明の適用範囲を示す空燃比と排気組成との
関係図である。
FIG. 2 is a relationship diagram of an air-fuel ratio and an exhaust gas composition showing an application range of the present invention.

【図3】従来技術の適用範囲を示す図2の相当図であ
る。
FIG. 3 is an equivalent view of FIG. 2 showing an applicable range of the conventional technique.

【符号の説明】[Explanation of symbols]

1 排気路 2 触媒コンバータ 3 上手側反応室 4 下手側反応室 5 狭隘路 6 2の排気入口 7 2の排気出口 8 通気路 10 還元触媒反応器 12 酸化触媒反応器 E エンジン 1 Exhaust Channel 2 Catalytic Converter 3 Upper Side Reaction Chamber 4 Lower Side Reaction Chamber 5 Narrow Path 6 2 Exhaust Inlet 7 2 Exhaust Outlet 8 Vent Path 10 Reduction Catalytic Reactor 12 Oxidation Catalytic Reactor E Engine

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 エンジン(E)の排気路(1)に触媒コンバ
ータ(2)を介装し、排気中の窒素酸化物、一酸化炭素、
炭化水素などを触媒コンバータ(2)で除去するように構
成したエンジンの排気浄化装置において、 上記触媒コンバータ(2)は、上手側反応室(3)と下手側
反応室(4)とを狭隘路(5)を介して連通して構成され、
上手側反応室(3)に排気入口(6)を、下手側反応室(4)
に排気出口(7)を各々開口し、狭隘路(5)を通気路(8)
を介して外気に連通して、 上記上手側反応室(3)を還元触媒反応器(10)を介して
排気入口(6)に臨ませ、下手側反応室(4)を酸化触媒反
応器(12)を介して排気出口(7)に臨ませることを特徴
とするエンジンの排気浄化装置。
1. A catalytic converter (2) is provided in an exhaust passage (1) of an engine (E), and nitrogen oxide, carbon monoxide,
In an engine exhaust gas purification device configured to remove hydrocarbons and the like by a catalytic converter (2), the catalytic converter (2) has a narrow passage between an upper side reaction chamber (3) and a lower side reaction chamber (4). It is configured to communicate via (5),
Exhaust inlet (6) to upper reaction chamber (3), lower reaction chamber (4)
Exhaust outlets (7) are opened in each, and narrow passage (5) is vented (8)
The upper reaction chamber (3) is exposed to the exhaust inlet (6) through the reduction catalyst reactor (10) and the lower reaction chamber (4) is connected to the oxidation catalyst reactor (4). An exhaust emission control device for an engine, characterized in that it is exposed to an exhaust outlet (7) via 12).
JP3270262A 1991-09-20 1991-09-20 Engine exhaust purification device Expired - Lifetime JP2814322B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3270262A JP2814322B2 (en) 1991-09-20 1991-09-20 Engine exhaust purification device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3270262A JP2814322B2 (en) 1991-09-20 1991-09-20 Engine exhaust purification device

Publications (2)

Publication Number Publication Date
JPH0586846A true JPH0586846A (en) 1993-04-06
JP2814322B2 JP2814322B2 (en) 1998-10-22

Family

ID=17483806

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3270262A Expired - Lifetime JP2814322B2 (en) 1991-09-20 1991-09-20 Engine exhaust purification device

Country Status (1)

Country Link
JP (1) JP2814322B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996012877A1 (en) * 1994-10-19 1996-05-02 Briggs & Stratton Corporation Catalytic converter having a venturi formed from two stamped components
WO1998057051A1 (en) * 1997-06-09 1998-12-17 Emitec Gesellschaft Für Emissionstechnologie Mbh Catalytic converter and method for purifying an exhaust gas flow from a small engine in an unregulated exhaust system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583215U (en) * 1978-12-01 1980-06-09
JPS61101623U (en) * 1984-12-10 1986-06-28

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583215U (en) * 1978-12-01 1980-06-09
JPS61101623U (en) * 1984-12-10 1986-06-28

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996012877A1 (en) * 1994-10-19 1996-05-02 Briggs & Stratton Corporation Catalytic converter having a venturi formed from two stamped components
WO1998057051A1 (en) * 1997-06-09 1998-12-17 Emitec Gesellschaft Für Emissionstechnologie Mbh Catalytic converter and method for purifying an exhaust gas flow from a small engine in an unregulated exhaust system

Also Published As

Publication number Publication date
JP2814322B2 (en) 1998-10-22

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