JPH03135417A - Nox removing device - Google Patents

Nox removing device

Info

Publication number
JPH03135417A
JPH03135417A JP1274193A JP27419389A JPH03135417A JP H03135417 A JPH03135417 A JP H03135417A JP 1274193 A JP1274193 A JP 1274193A JP 27419389 A JP27419389 A JP 27419389A JP H03135417 A JPH03135417 A JP H03135417A
Authority
JP
Japan
Prior art keywords
nox
gas
reduction
exhaust gas
trap
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
JP1274193A
Other languages
Japanese (ja)
Other versions
JPH088975B2 (en
Inventor
Mitsuyoshi Nakamoto
中本　充慶
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP27419389A priority Critical patent/JPH088975B2/en
Publication of JPH03135417A publication Critical patent/JPH03135417A/en
Publication of JPH088975B2 publication Critical patent/JPH088975B2/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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N13/00—Exhaust 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
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0878—Bypassing absorbents or adsorbents
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/12—Combinations of different methods of purification absorption or adsorption, and catalytic conversion
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Treating Waste Gases (AREA)

Abstract

PURPOSE:To decompose NOx with reduction catalyst without the need of ammonia by adsorbing NOx in the exhaust gas of engine, desorbing it with the combustion gas of low O2 concn., and passing it through the reduction catalyst to decompose NOx into N2 and O2. CONSTITUTION:There are provided the NOx adsorption unit 4 in which zeolite, etc., is used as an adsorbent, a high temp. gas generation unit 7, and a reduction unit 5 provided with the reduction catalyst. NOx in combustion gas is adsorbed in the NOx adsorption unit 4, and then desorbed by the high temp. gas of low O2 concn. sent from the high temp. gas generation unit 7, and the desorbed NOx is decomposed by the reduction unit 5 into N2 and O2. As a result, the NOx in the exhaust gas of engine, especially of diesel engine, is removed. The device of this system is allowed to be miniaturized because reduction gas, such as ammonia, is not used.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は燃焼排ガス中に含まれる窒素酸化物（以下、Ｎ
Ｏｘと云う）の分解、除去を目的としており、たとえば
ディーゼルエンジンの排ガス中のＮＯｘを分解、除去す
る装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to the treatment of nitrogen oxides (hereinafter referred to as N) contained in combustion exhaust gas.
The purpose of the present invention is to decompose and remove NOx in the exhaust gas of a diesel engine, for example.

従来の技術 燃焼排ガス中のＮＯｘを分解、除去する方法として、金
属あるいは金属酸化物を触媒とする還元触媒、あるいは
三元触媒を利用して、Ｎ２ｔ　　０２に分解していた。Conventional techniques As a method for decomposing and removing NOx in combustion exhaust gas, a reduction catalyst using a metal or a metal oxide as a catalyst, or a three-way catalyst has been used to decompose it into N2t02.

またディーゼルエンジンの排ガスの場合、ＯＱが高く、
三元触媒による還元は不可能であるため、アンモニアに
代表される還元ガスを燃焼ガス中に注入し、ＮＯｘをＮ
２．　　Ｏｓ分解し、除去することが行われてきた。Also, in the case of diesel engine exhaust gas, the OQ is high,
Since reduction using a three-way catalyst is impossible, a reducing gas such as ammonia is injected into the combustion gas to reduce NOx to N.
2. Efforts have been made to decompose and remove Os.

発明が解決しようとする課題 しかしながら、還元触媒あるいは三元触媒は燃焼ガス中
に多量に酸素が過剰に含まれる場合に効果がない。また
、アンモニアを使用する場合、アンモニアの処理の為に
大きな装置が必要となる。Problems to be Solved by the Invention However, reduction catalysts or three-way catalysts are ineffective when a large amount of excess oxygen is contained in the combustion gas. Furthermore, when ammonia is used, large equipment is required to process the ammonia.

課題を解決するための手段 エンジン排ガス中のＮＯｘを吸着した後、０２ｍ度の低
い燃焼ガスにより脱着させ、還元触媒あるいは三元触媒
の雰囲気を通過させ、ＮＯうをＮ２と０゜に分解する。Means for Solving the Problems After adsorbing NOx in engine exhaust gas, it is desorbed by combustion gas as low as 0.2m degrees, and then passed through the atmosphere of a reduction catalyst or three-way catalyst to decompose the NOx into N2 and 0°.

作用 アンモニアを必要とせずに三元触媒、還元触媒でＮＯｘ
を分解する。NOx reduction with three-way catalyst and reduction catalyst without the need for active ammonia
Disassemble.

実施例 第１図は第１の実施例のＮＯ０除去装置の構成図でアル
。ＮＯｘ除去システム１の動作について述べる。ディー
ゼルエンジン（図示せず）から排出した排気ガス９は、
ススなどの固体炭化水素を主成分とする通常パティクレ
ートとＮＯ工などの存寄な大気汚染物質を多（含んでい
る。この排気ガスはトラップ装置２を通過し、パティク
レートを除去したのち、コンバータ３に導入される。ト
ラップ装置２を通過したエンジン排ガスには大量のＮＯ
ｘを含んでおり、ＮＯｘの多くはＮＯである。コンバー
タ３ではＮＯからＮ　Ｏ２に酸化され、Ｎ０８の主成分
はＮＯ２となる。コンバータ３にはＮＯの酸化を促進す
るため、しばしば還元用空気が導入される。６はトラッ
プ装置２コンバータ３を通過した燃焼排ガスは吸着装置
４に導入され、燃焼排ガス中のＮＯｘは吸着され、燃焼
排ガスはＮＯｘを除去され、クリーンな燃焼排ガスとし
て放出される。Embodiment FIG. 1 is a block diagram of the NO0 removal device of the first embodiment. The operation of the NOx removal system 1 will be described. Exhaust gas 9 discharged from a diesel engine (not shown) is
It contains normal particrates mainly composed of solid hydrocarbons such as soot, and common air pollutants such as NO gas.This exhaust gas passes through the trap device 2 and after removing the particulates, is introduced into the converter 3.The engine exhaust gas that has passed through the trap device 2 contains a large amount of NO.
x, and most of the NOx is NO. In the converter 3, NO is oxidized to NO2, and the main component of N08 becomes NO2. Reducing air is often introduced into the converter 3 to promote oxidation of NO. 6 is a trap device 2 The combustion exhaust gas that has passed through the converter 3 is introduced into an adsorption device 4, NOx in the combustion exhaust gas is adsorbed, NOx is removed from the combustion exhaust gas, and the combustion exhaust gas is released as clean combustion exhaust gas.

吸着装置４である程度Ｎ０８が吸着すると、高温ガス発
生装置７から高温の燃焼ガスが供給され、ＮＯうを脱着
し、還元装置５へ導入する。When the adsorption device 4 adsorbs a certain amount of N08, high-temperature combustion gas is supplied from the high-temperature gas generator 7, desorbs the NO gas, and introduces it into the reduction device 5.

還元装置５では還元用空気８が供給され、ＮＯｘがＮ２
と０２に分解され、クリーン排ガスとして放出される。In the reduction device 5, reducing air 8 is supplied, and NOx is converted to N2.
It is decomposed into 02 and 02 and released as clean exhaust gas.

このシステムにおいて、トラップ装置２ではパティクレ
ートがトラップできる量に、吸着装置４ではＮＯｏの吸
着量に限界がある。本発明でこれらのパティクレートと
Ｎ０８の処理が重要な課題である。In this system, there is a limit to the amount of particulates that can be trapped in the trap device 2, and a limit to the amount of NOo that can be adsorbed in the adsorption device 4. In the present invention, treatment of these particrates and N08 is an important issue.

次に、本発明の処理システムを構成する装置のそれぞれ
について述べる。トラップ処理装置２を第２図に示す。Next, each of the devices constituting the processing system of the present invention will be described. The trap processing device 2 is shown in FIG.

トラップ処理装置２において、２１．２２はトラップ、
２５はフィルタ、２３．２４は切替装置、２６はパティ
クレートである。エンジン排ガス９はトラップ２１に導
入され、フィルタ２５でパティクレート２６が堆積する
。フィルタ２５はフィルタ機能と耐熱性を満足するため
、金属の網や多孔室のセラミックスからなる。フィルタ
２５を通過したエンジン排ガス９はコンバータ３に流入
する。In the trap processing device 2, 21.22 is a trap;
25 is a filter, 23, 24 is a switching device, and 26 is a particrate. The engine exhaust gas 9 is introduced into the trap 21, and particulates 26 are deposited on the filter 25. The filter 25 is made of metal mesh or porous ceramics in order to satisfy filter function and heat resistance. Engine exhaust gas 9 that has passed through filter 25 flows into converter 3 .

一方、ある程度パティクレート２６が堆積すると切替装
置２３が作動して、エンジン排ガス９はトラップ２１に
流入し、パティクレート２Ｂはトラップ２２に堆積する
。その後、切替装置２３が作動し、さらにリジェネレー
シロンバーナ６が燃焼し、高温の燃焼ガスがトラップ２
１に流入する。On the other hand, when the particrates 26 accumulate to a certain extent, the switching device 23 is activated, the engine exhaust gas 9 flows into the trap 21, and the particrates 2B are accumulated in the trap 22. After that, the switching device 23 is activated, and the regeneration silon burner 6 is combusted, and high-temperature combustion gas is transferred to the trap 2.
1.

すると、パティクレート２６が燃焼し、トラップ２１は
クリーンになる。パティクレート２６が燃焼した後の燃
焼ガス２７はコンバータ３に流入し、ＮＯがＮＯ□に酸
化される。Then, the particrate 26 is burned and the trap 21 becomes clean. The combustion gas 27 after the particrate 26 is burned flows into the converter 3, and NO is oxidized to NO□.

コンバータ３はＮＯをＮ　０２に酸化する作用がある。The converter 3 has the function of oxidizing NO to N02.

これは、ＮＯは吸着しにくいため、吸着しやすいＮ　Ｏ
２へ変換するためである。白金系の貴金属の効果が大き
く、この白金系貴金属をアルミナをウォッシュコートし
たセラミック担体に担持する。This is because NO is difficult to adsorb, so NO is easy to adsorb.
This is for converting to 2. Platinum-based noble metals have a great effect, and this platinum-based noble metal is supported on a ceramic carrier wash-coated with alumina.

この酸化には酸素が必要であり、酸素の不足した場合に
のみ還元用空気８が必要となる。ディーゼルエンジンか
らの排ガスには空気を多量に含むことがあるので、還元
用空気８のいらない場合がある。Oxygen is required for this oxidation, and reducing air 8 is required only when oxygen is insufficient. Since exhaust gas from a diesel engine may contain a large amount of air, reducing air 8 may not be necessary.

吸着装置４の構成を第３図に示す。４１．４２は吸着室
、４３は吸着剤、４４．４５は切替装置である。それぞ
れの吸着室４１．４２には吸着剤４３が装着されている
。吸着剤４３にはたとえばゼオライトが使用できる。エ
ンジン排ガスはパティクレートが除去され、ＮＯがＮＯ
２に変換されると吸着室４１に導入される。ＮＯ８は吸
着剤で吸着され、クリーンなガスとして放出される。あ
る程度のＮＯｘの量が吸着剤に吸着されると、切替装置
４４が作動し、エンジン排ガス９は吸着室４２に導入さ
れる。吸着室４１には高温で０２とＣＯの含んだ高温の
燃焼ガスが高温ガス発生装置７から供給される。吸着装
置４に吸着したＮ０８は離脱し、還元装置５に導入され
る。ＮＯ８はＮ２と０２に分解する。The configuration of the adsorption device 4 is shown in FIG. 41.42 is an adsorption chamber, 43 is an adsorbent, and 44.45 is a switching device. An adsorbent 43 is installed in each adsorption chamber 41, 42. For example, zeolite can be used as the adsorbent 43. Particulates are removed from engine exhaust gas, and NO becomes NO.
Once converted to 2, it is introduced into the adsorption chamber 41. NO8 is adsorbed by an adsorbent and released as a clean gas. When a certain amount of NOx is adsorbed by the adsorbent, the switching device 44 is activated and the engine exhaust gas 9 is introduced into the adsorption chamber 42 . High-temperature combustion gas containing O2 and CO is supplied from the high-temperature gas generator 7 to the adsorption chamber 41 . N08 adsorbed in the adsorption device 4 is separated and introduced into the reduction device 5. NO8 decomposes into N2 and 02.

還元装置５は還元触媒あるいは三元触媒が装着されてい
る。三元触媒には白金系貴金属をアルミナをウォッシュ
コートしたセラミック担体に担持する。また、三元触媒
が使用される場合、しばしば、未燃ガスを触媒出口で燃
焼させる。The reduction device 5 is equipped with a reduction catalyst or a three-way catalyst. In the three-way catalyst, a platinum-based noble metal is supported on a ceramic carrier wash-coated with alumina. Also, when a three-way catalyst is used, unburned gas is often combusted at the catalyst outlet.

発明の効果 以上のように本発明においては、エンジン排ガス特にデ
ィーゼルエンジンから排出するＮＯｘを除去することが
可能となった。この方式はアンモニアなどの還元ガスを
使用しないため、小型化が可能である。Effects of the Invention As described above, in the present invention, it has become possible to remove engine exhaust gas, particularly NOx discharged from a diesel engine. This method does not use reducing gas such as ammonia, so it can be made smaller.

また、本発明はパティクレートとＮ０８の同時除去が可
能であるとともにパティクレートを先に除去することで
パティクレートをリジェネレーシロンした後のＮＯｘを
も除去できる。Furthermore, the present invention enables the simultaneous removal of particulate and N08, and by removing the particrate first, it is also possible to remove NOx after the particrate has been regenerated.

さらに、本発明はＮＯをＮＯ２に変換することでＮＯｘ
の吸着量を増加する。Furthermore, the present invention converts NO to NO2 to reduce NOx
Increase the amount of adsorption.

また、本発明はパティクレート除去装置とＮ。Further, the present invention relates to a particulate removal device and N.

８除去装置の間にＮＯ２コンバータを設けることで、パ
ティクレートを処理する際のＮＯｘの処理を多量に行う
ことができる。By providing a NO2 converter between the 8 removal devices, a large amount of NOx can be treated when treating particrate.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の第１の実施例のＮＯｘ除去装置の構成
図、第２図は第１図におけるトラップ処理装置の構成図
、第３図は第１図における吸着装置の構成図である。 １・・ＮＯｘ除去システム、２・・トラップ装置、３・
・コンバータ、４・・吸着装置、８・・還元用空気、９
・・エンジン排ガス。FIG. 1 is a block diagram of the NOx removal device according to the first embodiment of the present invention, FIG. 2 is a block diagram of the trap treatment device in FIG. 1, and FIG. 3 is a block diagram of the adsorption device in FIG. 1. . 1. NOx removal system, 2. Trap device, 3.
・Converter, 4. Adsorption device, 8. Reduction air, 9
・Engine exhaust gas.

Claims (4)

【特許請求の範囲】[Claims] （１）ＮＯ＿ｘ吸着装置と、高温ガス発生装置と、還元
装置を有し、燃焼ガス中のＮＯ＿ｘを前記ＮＯ＿ｘ吸着
装置で吸着し、前記高温ガス発生装置からの高温ガスに
より前記吸着したＮＯ＿ｘを脱着し、前記脱着したＮＯ
＿ｘを前記還元装置によりＮ＿２とＯ＿２に分解するこ
とを特徴とするＮＯ＿ｘ除去装置。(1) It has an NO_x adsorption device, a high-temperature gas generation device, and a reduction device, and the NO_x in the combustion gas is adsorbed by the NO_x adsorption device, and the adsorbed NO_x is desorbed by the high-temperature gas from the high-temperature gas generation device. and the desorbed NO
An NO_x removal device characterized in that the reduction device decomposes _x into N_2 and O_2. （２）請求項１において、ＮＯ＿ｘ除去装置の入り口側
にパティクレート除去装置を設けたことを特徴とするＮ
Ｏ＿ｘ除去装置。(2) The N according to claim 1, characterized in that a particulate removal device is provided on the entrance side of the NO_x removal device.
O_x removal device. （３）請求項１において、ＮＯ＿ｘ除去装置の入り口側
にＮＯ＿２コンバータを設けたことを特徴とするＮＯ＿
ｘ除去装置。(3) According to claim 1, the NO_2 converter is provided on the entrance side of the NO_x removal device.
x removal device. （４）請求項２において、パティクレート除去装置とＮ
Ｏ＿ｘ除去装置の間にＮＯ＿２コンバータを設けたこと
を特徴とするＮＯ＿ｘ除去装置。(4) In claim 2, the particulate removal device and N
An NO_x removal device characterized in that an NO_2 converter is provided between the O_x removal devices.
JP27419389A 1989-10-20 1989-10-20 NO ▲ Down × ▼ Removal device Expired - Fee Related JPH088975B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27419389A JPH088975B2 (en) 1989-10-20 1989-10-20 NO ▲ Down × ▼ Removal device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27419389A JPH088975B2 (en) 1989-10-20 1989-10-20 NO ▲ Down × ▼ Removal device

Publications (2)

Publication Number Publication Date
JPH03135417A true JPH03135417A (en) 1991-06-10
JPH088975B2 JPH088975B2 (en) 1996-01-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
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JP (1) JPH088975B2 (en)

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EP0560991A1 (en) * 1991-10-03 1993-09-22 Toyota Jidosha Kabushiki Kaisha Device for purifying exhaust of internal combustion engine
EP0581279A2 (en) * 1992-07-30 1994-02-02 Toyota Jidosha Kabushiki Kaisha An exhaust gas purification device for an engine
EP0597106A1 (en) * 1991-10-14 1994-05-18 Toyota Jidosha Kabushiki Kaisha Exhaust and purification device for internal combustion engine
DE4319294C1 (en) * 1993-06-10 1994-05-19 Daimler Benz Ag Denitrification of engine exhaust gas without adding reducing agent - by adsorption in adsorber in exhaust pipe, periodic desorption with hot gas and recirculation to combustion in suction air supply
EP0598917A1 (en) * 1992-06-12 1994-06-01 Toyota Jidosha Kabushiki Kaisha Exhaust emission control system for internal combustion engine
US5388403A (en) * 1993-03-12 1995-02-14 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for an engine
US5402641A (en) * 1992-07-24 1995-04-04 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification apparatus for an internal combustion engine
US5404719A (en) * 1992-10-13 1995-04-11 Toyota Jidosha Kabushiki Kaisha Engine exhaust gas purification device
US5412945A (en) * 1991-12-27 1995-05-09 Kabushiki Kaisha Toyota Cho Kenkusho Exhaust purification device of an internal combustion engine
US5423181A (en) * 1992-09-02 1995-06-13 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device of an engine
US5448887A (en) * 1993-05-31 1995-09-12 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for an engine
US5450722A (en) * 1992-06-12 1995-09-19 Toyota Jidosha Kabushiki Kaisha Exhaust purification device of internal combustion engine
US5461857A (en) * 1993-06-11 1995-10-31 Toyota Jidosha Kabushiki Kaisha Engine exhaust gas purification device
US5472673A (en) * 1992-08-04 1995-12-05 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for an engine
US5483795A (en) * 1993-01-19 1996-01-16 Toyota Jidosha Kabushiki Kaisha Exhaust purification device of internal combustion engine
US5551231A (en) * 1993-11-25 1996-09-03 Toyota Jidosha Kabushiki Kaisha Engine exhaust gas purification device
US5746989A (en) * 1995-08-14 1998-05-05 Toyota Jidosha Kabushiki Kaisha Method for purifying exhaust gas of a diesel engine
EP0899431A2 (en) * 1997-08-25 1999-03-03 Toyota Jidosha Kabushiki Kaisha Device for purifying exhaust gas of engine
EP0913558A3 (en) * 1997-10-29 2000-03-22 DaimlerChrysler AG Exhaust gas purification apparatus for an internal-combustion engine
US6161378A (en) * 1996-06-10 2000-12-19 Hitachi, Ltd. Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas internal combustion engine
US6327847B1 (en) 2000-03-17 2001-12-11 Ford Global Technologies, Inc. Method for improved performance of a vehicle
EP1013904A3 (en) * 1998-12-22 2001-12-12 Toyota Jidosha Kabushiki Kaisha Internal combustion engine having lean NOx catalyst
US6367246B1 (en) 1997-04-24 2002-04-09 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for internal combustion engine
US6370868B1 (en) 2000-04-04 2002-04-16 Ford Global Technologies, Inc. Method and system for purge cycle management of a lean NOx trap
US6389803B1 (en) 2000-08-02 2002-05-21 Ford Global Technologies, Inc. Emission control for improved vehicle performance
US6487850B1 (en) 2000-03-17 2002-12-03 Ford Global Technologies, Inc. Method for improved engine control
US6499293B1 (en) 2000-03-17 2002-12-31 Ford Global Technologies, Inc. Method and system for reducing NOx tailpipe emissions of a lean-burn internal combustion engine
JP2003003828A (en) * 2001-06-22 2003-01-08 Bosch Automotive Systems Corp Aftertreatment method and device for diesel exhaust gas
US6596247B1 (en) 1996-10-25 2003-07-22 Hitachi, Ltd. Method for purifying exhaust gas from internal combustion engines
JP2004138022A (en) * 2002-10-21 2004-05-13 Babcock Hitachi Kk Method of and device for treating diesel exhaust gas
US6843051B1 (en) 2000-03-17 2005-01-18 Ford Global Technologies, Llc Method and apparatus for controlling lean-burn engine to purge trap of stored NOx
WO2005071236A1 (en) * 2004-01-21 2005-08-04 Yanmar Co., Ltd. Exhaust gas purifier and method of control therefor
WO2006103914A1 (en) * 2005-03-29 2006-10-05 Yanmar Co., Ltd. Exhaust gas purifier
JP2006272116A (en) * 2005-03-29 2006-10-12 Yanmar Co Ltd Exhaust gas purifying apparatus
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5021981A (en) * 1973-06-28 1975-03-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5021981A (en) * 1973-06-28 1975-03-08

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EP0560991A4 (en) * 1991-10-03 1994-03-30 Toyota Jidosha Kabushiki Kaisha
US5473887A (en) * 1991-10-03 1995-12-12 Toyota Jidosha Kabushiki Kaisha Exhaust purification device of internal combustion engine
US5471836A (en) * 1991-10-14 1995-12-05 Toyota Jidosha Kabushiki Kaisha Exhaust purification device of internal combustion engine
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EP0597106B1 (en) * 1991-10-14 1997-04-02 Toyota Jidosha Kabushiki Kaisha Exhaust and purification device for internal combustion engines
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US5388406A (en) * 1991-10-29 1995-02-14 Toyota Jidosha Kabushiki Kaisha NOx decreasing apparatus for an internal combustion engine
US5412945A (en) * 1991-12-27 1995-05-09 Kabushiki Kaisha Toyota Cho Kenkusho Exhaust purification device of an internal combustion engine
EP0598917A4 (en) * 1992-06-12 1998-08-19 Toyota Motor Co Ltd Exhaust emission control system for internal combustion engine.
EP0598917A1 (en) * 1992-06-12 1994-06-01 Toyota Jidosha Kabushiki Kaisha Exhaust emission control system for internal combustion engine
US5437153A (en) * 1992-06-12 1995-08-01 Toyota Jidosha Kabushiki Kaisha Exhaust purification device of internal combustion engine
US5450722A (en) * 1992-06-12 1995-09-19 Toyota Jidosha Kabushiki Kaisha Exhaust purification device of internal combustion engine
US5402641A (en) * 1992-07-24 1995-04-04 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification apparatus for an internal combustion engine
EP0581279A3 (en) * 1992-07-30 1994-12-14 Toyota Motor Co Ltd An exhaust gas purification device for an engine.
US5433074A (en) * 1992-07-30 1995-07-18 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for an engine
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US5483795A (en) * 1993-01-19 1996-01-16 Toyota Jidosha Kabushiki Kaisha Exhaust purification device of internal combustion engine
US5388403A (en) * 1993-03-12 1995-02-14 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for an engine
US5448887A (en) * 1993-05-31 1995-09-12 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for an engine
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US5461857A (en) * 1993-06-11 1995-10-31 Toyota Jidosha Kabushiki Kaisha Engine exhaust gas purification device
US5551231A (en) * 1993-11-25 1996-09-03 Toyota Jidosha Kabushiki Kaisha Engine exhaust gas purification device
US5746989A (en) * 1995-08-14 1998-05-05 Toyota Jidosha Kabushiki Kaisha Method for purifying exhaust gas of a diesel engine
US6397582B1 (en) 1996-06-10 2002-06-04 Hitachi, Ltd. Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas of internal combustion engine
US7093432B2 (en) 1996-06-10 2006-08-22 Hitachi, Ltd. Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas of internal combustion engine
US6161378A (en) * 1996-06-10 2000-12-19 Hitachi, Ltd. Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas internal combustion engine
US6596247B1 (en) 1996-10-25 2003-07-22 Hitachi, Ltd. Method for purifying exhaust gas from internal combustion engines
US6367246B1 (en) 1997-04-24 2002-04-09 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for internal combustion engine
EP0899431B1 (en) * 1997-08-25 2002-11-20 Toyota Jidosha Kabushiki Kaisha Device for purifying exhaust gas of engine
EP0899431A2 (en) * 1997-08-25 1999-03-03 Toyota Jidosha Kabushiki Kaisha Device for purifying exhaust gas of engine
EP0913558A3 (en) * 1997-10-29 2000-03-22 DaimlerChrysler AG Exhaust gas purification apparatus for an internal-combustion engine
EP1013904A3 (en) * 1998-12-22 2001-12-12 Toyota Jidosha Kabushiki Kaisha Internal combustion engine having lean NOx catalyst
US6843051B1 (en) 2000-03-17 2005-01-18 Ford Global Technologies, Llc Method and apparatus for controlling lean-burn engine to purge trap of stored NOx
US6327847B1 (en) 2000-03-17 2001-12-11 Ford Global Technologies, Inc. Method for improved performance of a vehicle
US6487850B1 (en) 2000-03-17 2002-12-03 Ford Global Technologies, Inc. Method for improved engine control
US6499293B1 (en) 2000-03-17 2002-12-31 Ford Global Technologies, Inc. Method and system for reducing NOx tailpipe emissions of a lean-burn internal combustion engine
US6370868B1 (en) 2000-04-04 2002-04-16 Ford Global Technologies, Inc. Method and system for purge cycle management of a lean NOx trap
US6389803B1 (en) 2000-08-02 2002-05-21 Ford Global Technologies, Inc. Emission control for improved vehicle performance
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