JPS59155523A - Filter regenerative apparatus in diesel exhaust fine particulate collecting device - Google Patents

Filter regenerative apparatus in diesel exhaust fine particulate collecting device

Info

Publication number
JPS59155523A
JPS59155523A JP58027792A JP2779283A JPS59155523A JP S59155523 A JPS59155523 A JP S59155523A JP 58027792 A JP58027792 A JP 58027792A JP 2779283 A JP2779283 A JP 2779283A JP S59155523 A JPS59155523 A JP S59155523A
Authority
JP
Japan
Prior art keywords
filter
catalyst
exhaust
light oil
reforming
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
JP58027792A
Other languages
Japanese (ja)
Inventor
Shigenori Sakurai
桜井 茂徳
Mikio Murachi
村知 幹夫
Yoshitsugu Ogura
義次 小倉
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor 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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP58027792A priority Critical patent/JPS59155523A/en
Publication of JPS59155523A publication Critical patent/JPS59155523A/en
Pending 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
    • 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
    • F01N3/28Construction of catalytic reactors
    • F01N3/2882Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • 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
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/023Exhaust 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
    • F01N3/025Exhaust 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 using fuel burner or by adding fuel to exhaust
    • F01N3/0253Exhaust 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 using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/031Exhaust 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 having means for by-passing filters, e.g. when clogged or during cold engine start
    • 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
    • F01N2250/00Combinations of different methods of purification
    • F01N2250/02Combinations of different methods of purification filtering and catalytic conversion

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

PURPOSE:To perform the regeneration of an oxidation catalyst supporting filter stably in a short time by supplying hydrocarbon with excellent reactivity with the catalyst by a structure wherein a device to generate hydrocarbon by reforming or cracking kerosene is provided between a fuel tank and a kerosene injection device. CONSTITUTION:An oxidation catalyst bearing filter 4 is arranged in the midway of an exhaust pipe 3 extending from the exhaust manifold 2 of a diesel engine main body 1. Further, a fuel injection device 5, which opens in the exhaust pipe 3, is installed between the filter 4 and the engine main body 1. In the above-mentioned arrangement, a reforming and cracking device 7 is connected to stainless steel pipes 8 and 9 composing of the by-path of the exhaust pipe 8 so as to let a part of exhaust gas pass through the vessel of the device 7 in order to facilitate to preheat a reaction tank 7' installed in the interior of the device 7. Furthermore, the kerosene sucked up by means of a fuel pump 6 is led in the reaction tank 7' so as to generate hydrocarbon by reforming or cracking with a catalyst layer 7a in order to inject the generated hydrocarbon into exhaust gas.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はディーゼルエンジンの排気浄化装置に関し、さ
らに詳細には、排気ガス中に含まれるカーyt’ン微粒
子及びこれと同様な粒状物(以下排気微粒子という)を
物理的方法でフィル°イエレメント等の適当な捕集材(
フィルタ)に捕捉し、捕集された排気微粒子を周期的に
焼却しフィルタの機能を恢復させるに適した排気浄化装
置におけるフィルタ再生装置に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an exhaust purification device for a diesel engine. ) is physically removed using a suitable collection material such as a fill element (
The present invention relates to a filter regeneration device in an exhaust gas purification device suitable for periodically incinerating exhaust particulates captured by a filter and restoring the function of the filter.

従来技術 ディーゼルエンジンの排気ガス中に含まれる排気微粒子
の捕捉手段として用いられるフィルりとしては、三次元
網目構造を有するセラミックフィルタやセルの排気ガス
入口及び出口に交互に栓をしたウオールスルータイプの
セラミックフィルタ、アルミコートを施したメタルメツ
シュやスチールウールフィルタ等が知られている。しか
しこれらのフィルタは、排気微粒子の捕捉量がある程度
増加すると、背圧が上昇するため、これを避けるべく捕
捉した排気微粒子を周期的に燃焼してフィルタを再生す
る必要がある。この排気微粒子の燃焼方法としては、 ■ 吸、排気絞シによシ排気ガス温度を排気微粒子の燃
焼温度である550〜600℃以上に上昇させる方法、 ■ 触媒によシ排気微粒子の燃焼温度を下げる方法、 ■ ヒータあるいはバーナーを排気ガス入口部(フィル
タの手前)に設は排気微粒子に着火して燃焼伝播させる
方法、 等が提案されている。
Prior Art Filters used as means for capturing exhaust particulates contained in the exhaust gas of diesel engines include ceramic filters with a three-dimensional mesh structure and wall-through type filters with plugs alternately installed at the exhaust gas inlet and outlet of the cell. Ceramic filters, aluminum-coated metal mesh filters, steel wool filters, and the like are known. However, in these filters, when the amount of captured exhaust particles increases to a certain extent, the back pressure increases, so in order to avoid this, it is necessary to periodically burn the captured exhaust particles to regenerate the filter. The methods of combustion of the exhaust particulates include: (1) raising the exhaust gas temperature to 550 to 600°C or higher, which is the combustion temperature of the exhaust particulates, using intake and exhaust throttles, and (2) raising the combustion temperature of the exhaust particulates using a catalyst. Proposed methods include: 1. Installing a heater or burner at the exhaust gas inlet (before the filter) to ignite exhaust particulates and propagate the combustion.

しかし■の方法では排気ガス温度をこのように高温にす
ることは、高速走行時には可能であっても低速走行時に
おいては不可能である。また■の方法では一般走行領域
で得られる排気ガス温である約250℃で排気微粒子を
燃焼できる触媒が未だ開発されていない。さらに■の方
法では全糞行領域においてフィルタ再生を可能とするに
は、排気ガス流量及び着火時期の制御あるいは着火シス
テム等、構成が複雑になるという問題があ、る。
However, in the method (2), it is possible to raise the exhaust gas temperature to such a high temperature when the vehicle is running at high speed, but it is not possible when the vehicle is running at low speed. Furthermore, in the method (2), a catalyst that can burn exhaust particulates at approximately 250° C., which is the exhaust gas temperature obtained in a normal driving range, has not yet been developed. Furthermore, in method (2), in order to enable filter regeneration in the entire fecal area, there is a problem that the configuration such as control of exhaust gas flow rate and ignition timing or ignition system becomes complicated.

そこで本出願人は他のフィルタ再生方法として、フィル
タ上流の排気ガス中に炭化水素あるいは一酸化炭素を導
入し、これをフィルタに担持した触媒で燃焼し、発生し
た熱によシ捕捉した排気微粒子を燃焼する方法を提案し
た。(4!願昭57−210576号参照)。しかしこ
の方法においても導入する炭化水素源として軽油を用い
た場合には、軽油粒子と触媒との反応になυ、触媒との
反応が遅く再生を完全に行うためには、軽油の噴射時間
を長くしなければな、らす、燃料噴射弁として霧化性能
の良好なものを使用しなければならないという問題があ
る。
Therefore, the present applicant has proposed another filter regeneration method in which hydrocarbons or carbon monoxide is introduced into the exhaust gas upstream of the filter, and this is combusted by a catalyst supported on the filter, and the exhaust particulates are captured by the generated heat. proposed a method of burning. (See 4! Application No. 57-210576). However, when light oil is used as the hydrocarbon source to be introduced in this method, the reaction between light oil particles and the catalyst is slow, and in order to perform complete regeneration, the light oil injection time is required. There are problems in that it has to be long, it has to be long, and it has to use a fuel injector with good atomization performance.

発明の目的 本発明は上記の問題点を解決するためになされたもので
あって、その目的とするところは、排気ガス中に噴射す
る軽油を改質あるいは分解して触媒との反応性の良い炭
化水素を供給して反応効率をあげ、短時間で安定したフ
ィルタの再生ができるディーゼル排気微粒子捕集装置に
おけるフィルタ再生装置を提供することにある。
Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and its purpose is to reform or decompose light oil to be injected into exhaust gas so that it has good reactivity with a catalyst. It is an object of the present invention to provide a filter regeneration device for a diesel exhaust particulate collector that can supply hydrocarbons to increase reaction efficiency and regenerate the filter stably in a short time.

発明の構成 本発明は上記目的達成のため、その構成として、ディー
ゼルエンジンの排気系に酸化触媒担持フィルタを設置し
その上流側の排気管内に燃料タンク内の軽油を噴射する
装置を備えたディーゼル排気微粒子捕集装置におけるフ
ィルタ再生装置において、前記燃料タンクと軽油噴射装
置との間に軽油を改質あるいは分解して触媒と反応し易
い炭化水素を発生する装置を設けたことを特徴とするも
のである。
Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a diesel exhaust system that includes an oxidation catalyst-carrying filter installed in the exhaust system of a diesel engine and a device for injecting light oil in a fuel tank into the exhaust pipe on the upstream side. The filter regeneration device in the particulate collector is characterized in that a device for reforming or decomposing light oil to generate hydrocarbons that easily react with the catalyst is provided between the fuel tank and the light oil injection device. be.

実施例 本発明の実施例について添付図面を参照して以下説明す
る。
Embodiments Examples of the present invention will be described below with reference to the accompanying drawings.

第1図は本発明の実験を兼ねた実施例を示すものであっ
て、2.21デイ一ゼルエンジン本体1のエキゾースト
マニホルド2から延ひる排気管3の途中に酸化触媒とし
てパラジウムを容積11当93g担持したフオームフィ
ルタ4を設ける。エンジン本体1とフオームフィルタ4
との間には排気管3内に開口する燃料噴射装置5を配設
する。この燃料噴射装置5は燃料ボンf6、軽油の改質
、分解装置7を介して燃料タンク10へ通じておシ、燃
料噴射装置5のバルブを開くことによシ、排気ガス中へ
軽油を噴射できるようになっている。軽油の改質、分解
装置7は、排気管3の・ぐイ・ぐス通路を構成するステ
ンレス・悩プ8及び9に連結し、排気ガスの一部がこの
軽油改質分解装置7の容器内を通過しその内部にある反
応槽7′を予熱するようになっている。反応槽7′の内
部には触媒層7a。
FIG. 1 shows an experimental embodiment of the present invention, in which a volume of 11 equivalents of palladium was placed as an oxidation catalyst in the middle of the exhaust pipe 3 extending from the exhaust manifold 2 of the diesel engine main body 1. A foam filter 4 carrying 93g is provided. Engine body 1 and foam filter 4
A fuel injection device 5 opening into the exhaust pipe 3 is disposed between the exhaust pipe 3 and the exhaust pipe 3 . This fuel injection device 5 is connected to a fuel tank 10 via a fuel cylinder f6 and a light oil reforming and decomposition device 7, and by opening a valve of the fuel injection device 5, light oil is injected into exhaust gas. It is now possible to do so. The light oil reforming and decomposing device 7 is connected to stainless steel pipes 8 and 9 that constitute the gas passage of the exhaust pipe 3, and a portion of the exhaust gas flows into the container of the light oil reforming and decomposing device 7. The reactor 7' is preheated by passing through the interior of the reactor tank 7'. A catalyst layer 7a is provided inside the reaction tank 7'.

この触媒層7aを支持する300メツシユのステンレス
金網7 b、 濾lステンレスウール7cを収容し、そ
の一方何はパイプ11により燃料タンク10に連通し、
他方側はパイプ12によシ燃判ポンプ6を介して燃料噴
射装置5に連通している。
A 300-mesh stainless steel wire mesh 7b supporting the catalyst layer 7a and a stainless steel wool filter 7c are housed therein, while a pipe 11 communicates with the fuel tank 10.
The other side is connected to a fuel injection device 5 via a fuel pump 6 through a pipe 12 .

このようにして燃料ポンゾロ−で汲み上げられた軽油は
、反応槽7′内に導入され、触媒層7aによって改質あ
るいは分解されて炭化水素(HC)を発生し、これが排
気ガス中に噴射されるようになっている。なお13は排
気ガス分析計であって軽油噴射時の排気ガス中の炭化水
素(HC)量を検出するためのものであシ、14は差圧
計であってフオームフィルタ4に捕集された排気微粒子
の燃焼状態を検出するだめのものである。
The light oil pumped up by the fuel pump in this way is introduced into the reaction tank 7' and reformed or decomposed by the catalyst layer 7a to generate hydrocarbons (HC), which are injected into the exhaust gas. It looks like this. Note that 13 is an exhaust gas analyzer for detecting the amount of hydrocarbons (HC) in the exhaust gas during light oil injection, and 14 is a differential pressure gauge for detecting the amount of hydrocarbons (HC) in the exhaust gas collected by the foam filter 4. This is only for detecting the combustion state of particulates.

上記の構成の本装置の作動実験の結果は次のとおシであ
る− エンジン1を2000 rpm X aゆ・mで8時間
運転し、フオームフィルタ4に排気微粒子を捕集した。
The results of an operation experiment of this apparatus having the above-mentioned configuration were as follows: The engine 1 was operated for 8 hours at 2000 rpm, and exhaust particulates were collected in the foam filter 4.

このときフオームフィルタ4に付着した排気微粒子量は
フオームフィルタ1個”h+:>x4.xgであった。
At this time, the amount of exhaust particulates adhering to the foam filter 4 was "h+:>x4.xg" for one foam filter.

次に燃料ポンプ6を作動させ反応槽7′内に軽油を汲み
上げ、エンジン条件を2000 rpx9kg・m1排
気ガス温度390℃で30分間運転し、反応槽温度を3
50°Cとして軽油を分解し、その後エンジン条件を2
000 rpm X 3 kg・mに変えて排気ガス温
度を200℃にセットした。次いで、このときの差圧を
読み取シ、燃料噴射装置5によ多燃料を、5分間噴射し
、経過時間と差圧との関係をプロットした。なおこの際
に軽油の改質に用いた触媒は、γ−M203担体に白金
を0,75重量%担持したものであシ、燃料噴射量はフ
ォー千フィルタ4へ流入する排気ガスの0.5%であっ
た。
Next, the fuel pump 6 is operated to pump light oil into the reaction tank 7', and the engine is operated for 30 minutes at 2000 rpm x 9 kg/m1 with an exhaust gas temperature of 390°C, and the reaction tank temperature is reduced to 3.
Decompose the diesel oil at 50°C, then reduce the engine condition to 2.
000 rpm x 3 kg/m and the exhaust gas temperature was set to 200°C. Next, the differential pressure at this time was read, more fuel was injected into the fuel injection device 5 for 5 minutes, and the relationship between the elapsed time and the differential pressure was plotted. The catalyst used for reforming the light oil was a γ-M203 carrier carrying 0.75% by weight of platinum, and the fuel injection amount was 0.5% of the exhaust gas flowing into the Four Thousand Filter 4. %Met.

その実験結果は第2図の実線に示すとおシである。The experimental results are shown in the solid line in FIG.

本実施例に対応する比較例の実験結果は次のとおシであ
る。
The experimental results of the comparative example corresponding to this example are as follows.

比較例においては軽油を反応槽7′に通さず直接排気ガ
ス中へ噴射するようにした点板外は、上記実施例と同じ
である。す々わちエンジン条件2000 rpm X 
3kli’・mで8時間、エンジン1を運転し、フオー
ムフィルタ4に排気微粒子を捕集しフオームフィルタ1
個当、914.8.Fの排気微粒子を付着させた。これ
は実施例と排気微粒子捕集条件を揃えるためである。次
にエンジン条件を2000rpmX3k17・m、排気
ガス温度200℃にセットして、軽油を5分間噴射し、
経過時間と差圧との関係をプロットした。なおこのとき
の軽油噴射量は実施例同様に排気ガス流量の0.5%と
した。その実験の結果は第2図の破線のとおシである。
The comparative example is the same as the above example except for the point plate in which the light oil is injected directly into the exhaust gas without passing through the reaction tank 7'. Suwachi engine condition 2000 rpm
The engine 1 was operated for 8 hours at 3kli'・m, and the foam filter 4 collected the exhaust particulates.
Individual win, 914.8. F exhaust particulates were attached. This is to make the exhaust particulate collection conditions the same as in the embodiment. Next, set the engine conditions to 2000rpm x 3k17m, exhaust gas temperature 200℃, inject light oil for 5 minutes,
The relationship between elapsed time and differential pressure was plotted. Note that the amount of light oil injected at this time was 0.5% of the exhaust gas flow rate, similar to the example. The results of the experiment are indicated by the broken line in FIG.

この第2図から明らかなように、反応槽7′内に軽油を
導入して改質した後、排気ガス中に噴射した燃料は触媒
との反応性が高く、反応槽7′に導入しないで軽油をそ
のまま噴射した場合よりも短時間でフィルタに付着した
排気微粒子を燃焼させることが可能であることがわかる
As is clear from FIG. 2, the fuel injected into the exhaust gas after introducing light oil into the reaction tank 7' for reformation has high reactivity with the catalyst and should not be introduced into the reaction tank 7'. It can be seen that it is possible to burn the exhaust particulates attached to the filter in a shorter time than when diesel oil is directly injected.

なお本実施例では、軽油改質用触媒としてPt−AA!
203を用いたが、触媒種としては、これに限られず、
また生成物も何であるかについては特に規定されない。
In this example, Pt-AA! is used as the gas oil reforming catalyst.
203 was used, but the catalyst species are not limited to this.
Furthermore, there is no particular restriction as to what the product is.

本実施例の場合は、反応条件から見て、反応槽7′に供
給された軽油の一部が側鎖、環状あるいは低級直鎖の形
で排気ガス中に噴射されたと考えられるが、炭素数14
〜16といわれている直鎖の炭化水素でろる軽油に比べ
て、反応性の高い炭化水素成分が一部あれば、フィルタ
表面での着火源として有効であシ、捕集した排気微粒子
の燃焼に効果が出ると考えられる。
In the case of this example, considering the reaction conditions, it is thought that a part of the light oil supplied to the reaction tank 7' was injected into the exhaust gas in the form of side chains, rings, or lower straight chains. 14
Compared to light oil, which is made up of straight-chain hydrocarbons that are said to have a carbon content of ~16, if there is some highly reactive hydrocarbon component, it is effective as an ignition source on the filter surface, and the collected exhaust particulates are It is thought to have an effect on combustion.

発明の効果 本発明は以上説明したように、排気ガス中に噴射すべき
軽油を特に改質あるいは分解して触媒と反応し易い炭化
水素を発生させるようにして噴射するものであるから、
この噴射燃料とフィルタに担持された触媒との反応性が
向上しフィルタ表面で速やかに燃焼し短時間でフィルタ
に付着した排気微粒子を燃焼させることができる。
Effects of the Invention As explained above, the present invention injects light oil to be injected into exhaust gas by specifically reforming or decomposing it to generate hydrocarbons that easily react with the catalyst.
The reactivity between the injected fuel and the catalyst supported on the filter is improved, and the fuel is quickly combusted on the surface of the filter, allowing exhaust particulates adhering to the filter to be combusted in a short period of time.

また燃料噴射装置の霧化性能によってフィルタの再生性
能が左右されることもなく、安定したフィルタの再生が
可能となるものであるみ
In addition, the filter regeneration performance is not affected by the atomization performance of the fuel injection device, and stable filter regeneration is possible.

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

第1図は本発明の実験を兼ねた実施例の模式的系統図、 第2図は同上実施例と比較例との実験結果を示すグラフ
である。 1・・・ディーゼルエンジン本体、3・・・排気管、4
′・・・フオームフィルタ、5・・・燃料噴射装置、6
・・・燃料ボン7″、7・・・軽油改良・分解装置、7
′・・・反応槽、10・・・燃料タンク。 第11゛1 1A θふ2図 燃料、噴射時間 (mLn)
FIG. 1 is a schematic system diagram of an example that also serves as an experiment of the present invention, and FIG. 2 is a graph showing the experimental results of the same example and a comparative example. 1... Diesel engine body, 3... Exhaust pipe, 4
'... Form filter, 5... Fuel injection device, 6
...Fuel cylinder 7'', 7...Diesel oil improvement/decomposition device, 7
′...Reaction tank, 10...Fuel tank. 11゛1 1A θF2 Figure Fuel, injection time (mLn)

Claims (1)

【特許請求の範囲】 1、ディーゼルエンジンの排気系に酸化触媒担持フィル
タを設置し、その上流側の排気管内に燃料タンク内の軽
油を噴射する装置を備えたディーゼル排気微粒子捕集装
置におけるフィルタ再生装置において、前記燃料タンク
と軽油噴射装置との間に軽油を改質あるいは分解して触
媒と反応し易い炭化水素を発生する装置を設けたことを
特徴とするフィルタ再生装置。 2、前記軽油を改質あるいは分解する装置が、触媒と−
この触媒を支持する金網と濾過用金属ウー°ルとを収容
した反応槽によって構成されている特許請求の範囲第1
項記載のフィルタ再生装置。 3、前記触、媒としてγ〜Al2O3担体に白金を担持
した触媒を用いる特許請求の範囲第2項記載のフィルタ
再生装置。
[Scope of Claims] 1. Filter regeneration in a diesel exhaust particulate collector equipped with an oxidation catalyst-supported filter installed in the exhaust system of a diesel engine and a device for injecting light oil in a fuel tank into the exhaust pipe on the upstream side thereof. A filter regeneration device characterized in that a device for reforming or decomposing light oil to generate hydrocarbons that easily react with a catalyst is provided between the fuel tank and the light oil injection device. 2. The equipment for reforming or decomposing the light oil has a catalyst and -
Claim 1 constituted by a reaction tank containing a wire mesh for supporting the catalyst and metal wool for filtration.
The filter regeneration device described in Section 1. 3. The filter regeneration device according to claim 2, wherein the catalyst is a catalyst in which platinum is supported on a γ-Al2O3 carrier.
JP58027792A 1983-02-23 1983-02-23 Filter regenerative apparatus in diesel exhaust fine particulate collecting device Pending JPS59155523A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58027792A JPS59155523A (en) 1983-02-23 1983-02-23 Filter regenerative apparatus in diesel exhaust fine particulate collecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58027792A JPS59155523A (en) 1983-02-23 1983-02-23 Filter regenerative apparatus in diesel exhaust fine particulate collecting device

Publications (1)

Publication Number Publication Date
JPS59155523A true JPS59155523A (en) 1984-09-04

Family

ID=12230820

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58027792A Pending JPS59155523A (en) 1983-02-23 1983-02-23 Filter regenerative apparatus in diesel exhaust fine particulate collecting device

Country Status (1)

Country Link
JP (1) JPS59155523A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189876A (en) * 1990-02-09 1993-03-02 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification system for an internal combustion engine
EP0743429A3 (en) * 1995-05-18 1998-06-10 Toyota Jidosha Kabushiki Kaisha Device for purifying the exhaust gas of a diesel engine
FR2922942A3 (en) * 2007-10-26 2009-05-01 Renault Sas Particle filter regenerating method for internal combustion engine of vehicle, involves evaporating organic liquid at temperature that is less than that of fuel injected in combustion chamber of internal combustion engine
EP2058480A1 (en) 2007-11-09 2009-05-13 Kabushiki Kaisha Toyota Jidoshokki Exhaust gas purifying system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189876A (en) * 1990-02-09 1993-03-02 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification system for an internal combustion engine
EP0743429A3 (en) * 1995-05-18 1998-06-10 Toyota Jidosha Kabushiki Kaisha Device for purifying the exhaust gas of a diesel engine
FR2922942A3 (en) * 2007-10-26 2009-05-01 Renault Sas Particle filter regenerating method for internal combustion engine of vehicle, involves evaporating organic liquid at temperature that is less than that of fuel injected in combustion chamber of internal combustion engine
EP2058480A1 (en) 2007-11-09 2009-05-13 Kabushiki Kaisha Toyota Jidoshokki Exhaust gas purifying system

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