JP2003533626A - Equipment for treating exhaust gas - Google Patents

Equipment for treating exhaust gas

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Publication number
JP2003533626A
JP2003533626A JP2001584717A JP2001584717A JP2003533626A JP 2003533626 A JP2003533626 A JP 2003533626A JP 2001584717 A JP2001584717 A JP 2001584717A JP 2001584717 A JP2001584717 A JP 2001584717A JP 2003533626 A JP2003533626 A JP 2003533626A
Authority
JP
Japan
Prior art keywords
exhaust gas
particle filter
internal combustion
combustion engine
fuel
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
JP2001584717A
Other languages
Japanese (ja)
Inventor
シャラー ヨハネス
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of JP2003533626A publication Critical patent/JP2003533626A/en
Pending legal-status Critical Current

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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
    • F01N3/02—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
    • F01N3/02—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
    • F01N3/025—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 using fuel burner or by adding fuel to exhaust
    • F01N3/0253—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 using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • F01N3/033—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 in combination with other devices
    • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N2240/16—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 an electric heater, i.e. a resistance heater
    • 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
    • F01N2250/02—Combinations of different methods of purification filtering 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

(57)【要約】 粒子フィルタ（４）を備えた、内燃機関特にディーゼル内燃機関の排ガスを処理するための装置（１）が提案されており、この装置（１）は、従来のシステムに対して安価な費用で実現することができ、確実な粒子フィルタ再生を保証する。これは、本発明によれば、この装置（１）が、触媒式のバーナ（３）を有しており、該バーナ（３）が内燃機関と粒子フィルタ（４）との間に配置されていることによって実現される。 (57) [Summary] An apparatus (1) for treating exhaust gas of an internal combustion engine, particularly a diesel internal combustion engine, provided with a particle filter (4) has been proposed. This apparatus (1) is different from a conventional system. It can be realized at low cost and guarantees reliable regeneration of the particle filter. This means that, according to the invention, the device (1) has a catalytic burner (3), which is arranged between the internal combustion engine and the particle filter (4). It is realized by having.

Description

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

【０００１】 本発明は、請求項１の上位概念部に記載した形式の、粒子フィルタ（Ｐａｒｔ
ｉｋｅｌｆｉｌｔｅｒ）を備えた内燃機関特にディーゼル内燃機関の排ガスを処
理するための装置に関する。The invention relates to a particle filter (Part) of the type described in the preamble part of claim 1.
The invention relates to a device for treating the exhaust gas of an internal combustion engine, in particular a diesel internal combustion engine, with an ikelfilter).

【０００２】 従来の技術 進歩した知識に相応して、健康及び環境を保護するための、自動車の排出物を
制御する法的な規制は、ますます厳しくなっている。このような規制を満たすた
めに、例えば相応の処理された燃料を使用すると共に、フィルタを用いて排ガス
から固形の粒子状物質（Ｐａｒｔｉｋｅｌ）を取り除くようになっている。[0002] In response to the advanced knowledge, the legal regulations for controlling vehicle emissions to protect health and environment are becoming more and more stringent. In order to meet such regulations, for example, a correspondingly treated fuel is used and a filter is used to remove solid particulate matter from the exhaust gas.

【０００３】 特にディーゼル駆動装置は大量の煤煙を発生し、この場合、ディーゼル排ガス
は癌の原因となる疑いがある。従ってこのようなディーゼル排ガスを処理するた
めの多くの装置が既に提案されている。一般的に、この装置は、各含有物質を濾
過するフィルタシステムより成っている。この場合、効率的なフィルタは、特に
約１０〜５０００ナノメートル（Ｎａｎｏｍｅｔｏｅｒ）の直径を有する煤煙粒
子を効果的に濾過する。Diesel drives, in particular, generate a large amount of soot, in which case diesel exhaust is suspected of causing cancer. Therefore, many devices for treating such diesel exhaust gas have already been proposed. Generally, the device consists of a filter system that filters each contained material. In this case, the efficient filter effectively filters soot particles, especially with a diameter of about 10 to 5000 Nanometer.

【０００４】 しかしながら相応のフィルタによって濾過された粒子は、フィルタ若しくはそ
の表面を覆うことによってガス装入量を減少させ、それによって濾過抵抗が高く
なる。この抵抗は、燃料の大量消費を招き、ひいてはエンジンが停止することに
なるので、しばしば再生させる必要がある。再生は、一般的に、蓄積された煤煙
をほぼ残滓なしに燃焼させることによって行われる。このために一般的に、ディ
ーゼル排ガスの約２００℃の温度は、不十分であるので、付加的なシステム補助
を準備する必要がある。However, particles filtered by a corresponding filter reduce the gas charge by covering the filter or its surface, which increases the filtration resistance. This resistance often leads to a large consumption of fuel and thus to an engine shutdown, which often needs to be regenerated. Regeneration is generally carried out by burning the accumulated soot with almost no residue. For this reason, in general, the temperature of diesel exhaust of around 200 ° C. is inadequate and it is necessary to provide additional system assistance.

【０００５】 付加的な手段なしでは、煤煙は約５５０℃〜６００℃で酸化する。煤煙フィル
タを酸化触媒と組み合わせることによって、又はフィルタを触媒で被覆すること
によって、煤煙酸化のための下限温度は約２５０℃〜３５０℃に低下する。しか
しながらこの温度は、最近のディーゼルエンジンのためには常に一般的な排ガス
温度を上回っているので、確実なフィルタ再生のための温度を上昇させる手段が
必要となる。Without additional measures, soot oxidizes at about 550 ° C to 600 ° C. By combining the soot filter with an oxidation catalyst or coating the filter with a catalyst, the lower temperature limit for soot oxidation is reduced to about 250 ° C to 350 ° C. However, since this temperature is always above the exhaust gas temperature typical for modern diesel engines, a means of raising the temperature for reliable filter regeneration is needed.

【０００６】 排ガス温度を上昇させるために従来では例えば電気式の補助ヒータ、マイクロ
波ヒータ又は内部エンジン式手段が設けられており、この場合これらの手段は、
必要とされる高い加熱効率に基づいて場合によっては付加的なバッテリーを必要
とし、高いシステムコストを有しているか、又は必要な温度上昇が確実に保証さ
れない。Conventionally, for example, electric auxiliary heaters, microwave heaters or internal engine type means are provided for increasing the exhaust gas temperature, in which case these means are
Depending on the high heating efficiency required, it may require additional batteries, have a high system cost or do not guarantee the required temperature rise.

【０００７】 従って実用自動車においては一部でバーナが用いられており、この場合、直接
的な火炎（ｏｆｆｅｎｅ Ｆｌａｍｍｅ）によってフィルタが燃焼されるが、温
度均一分布、点火開始、燃焼規則その他に関連した要求は非常に高いものであっ
て、この要求を満たす相応のシステムを実現するためには非常にコストがかかる
ものである。さらにまた、特に直接的な火炎による点火及び燃焼は、システム全
体に高い安全技術的な要求を課すことになる。[0007] Therefore, burners are used in part in practical automobiles, in which the filter is burned by the direct flame, but it is related to the uniform temperature distribution, ignition start, combustion rule, etc. The demands are very high and it is very costly to realize a corresponding system to meet this demand. Furthermore, particularly direct flame ignition and combustion imposes high safety technical requirements on the overall system.

【０００８】 従ってこのような排ガス濾過システムは全体的に比較的高価であって、かつ／
又は各運転時点における粒子フィルタの再生のために確実な温度上昇は保証され
ない。Such exhaust gas filtration systems are therefore relatively expensive overall and / or
Alternatively, a reliable temperature rise is not guaranteed due to the regeneration of the particle filter at each operating point.

【０００９】 発明の利点 これに対して本発明の課題は、システムに制限された費用が著しく減少される
と同時に各運転時点において確実な粒子フィルタ再生が保証され、しかも安全技
術的な危険性が存在しないような、内燃機関特にディーゼル内燃機関の排ガスを
処理するための、粒子フィルタを備えた装置を提供することである。Advantages of the invention The object of the present invention, on the other hand, is that the cost limited to the system is significantly reduced, while at the same time a reliable particle filter regeneration is ensured at each operating point, which is a safety-related risk. It is an object of the invention to provide a device with a particle filter for treating the exhaust gas of an internal combustion engine, in particular a diesel internal combustion engine, which does not exist.

【００１０】 この課題は、冒頭に記載した装置において、請求項１の特徴によって解決され
た。This problem has been solved by the features of claim 1 in the device described at the outset.

【００１１】 従属請求項に記載した手段によって、本発明の有利な構成及び実施態様が可能
である。Advantageous configurations and embodiments of the invention are possible by means of the measures recited in the dependent claims.

【００１２】 本発明による装置は、触媒式のバーナを有しており、該バーナが内燃機関と粒
子フィルタとの間に配置されていることを特徴としている。The device according to the invention is characterized in that it comprises a catalytic burner, which is arranged between the internal combustion engine and the particle filter.

【００１３】 このような形式の装置によって、酸素（Ｏ２）を有する燃料（ＨＣ）は触媒に
おいて、水（Ｈ２Ｏ）と二酸化炭素（ＣＯ２）に変換される。この場合に発生し
た反応熱によって、排ガス温度は再生温度に上昇せしめられ、それによって粒子
フィルタの再生が行われる。With this type of device, the fuel (HC) containing oxygen (O 2 ) is converted into water (H 2 O) and carbon dioxide (CO 2 ) at the catalyst. Due to the reaction heat generated in this case, the exhaust gas temperature is raised to the regeneration temperature, whereby the particle filter is regenerated.

【００１４】 有利な形式で、良好に点火可能及び燃焼可能な燃料混合気を提供すること、並
びに混合気を点火するための装置は省かれる。燃料混合気を点火及び燃焼させる
際の安全技術的な危険性はなくなる。本発明によるバーナの触媒材料は、約２０
０℃の排ガス温度において既に燃料の変換を保証する。In an advantageous manner, a device for providing a well-ignitable and combustible fuel mixture and for igniting the mixture is omitted. The safety and technical risks of igniting and burning a fuel mixture are eliminated. The catalytic material of the burner according to the invention comprises about 20
It already guarantees a conversion of the fuel at an exhaust gas temperature of 0 ° C.

【００１５】 有利には、内燃機関とバーナとの間に燃料調量装置が配置されているので、燃
料は必要に合わせて供給される。つまり燃料は、例えば排ガス対抗圧力が諸知恵
の限界値に達した時に、排ガス流内で触媒式のバーナの手前で調量される。また
フィルタが燃焼されると、例えば燃料調量は停止される。Advantageously, the fuel metering device is arranged between the internal combustion engine and the burner, so that the fuel is supplied on demand. In other words, the fuel is metered in the exhaust gas stream before the catalytic burner, for example when the exhaust gas counterpressure reaches the limit values of various wisdoms. When the filter is burned, fuel metering is stopped, for example.

【００１６】 本発明の特別な実施態様では、燃料調量装置が燃料拡散ユニットを有している
ので、供給された燃料はバーナの触媒材料と比較的良好に接触せしめられ、この
際に、調量された燃料は完全に変換され、それによってフィルタ再生のために必
要な熱が発生する。In a special embodiment of the invention, the fuel metering device comprises a fuel diffusion unit so that the fuel supplied is brought into relatively good contact with the catalytic material of the burner, during which The metered fuel is completely converted, which generates the heat required for filter regeneration.

【００１７】 有利な形式で燃料調量装置のための制御装置が設けられているので、燃料調量
は、例えば排ガスの所定の対抗圧力が得られると自動的に行われ、フィルタが燃
焼されると自動的に終了される。さらにまた、排ガス流及び／又はその煤煙含有
量に関連して、燃料供給に対するフレキシブルな適合が可能である。A control device for the fuel metering device is provided in an advantageous manner, so that fuel metering takes place automatically, for example when a predetermined counterpressure of the exhaust gas is obtained, and the filter is burned. And will be automatically terminated. Furthermore, a flexible adaptation to the fuel supply is possible in connection with the exhaust gas stream and / or its soot content.

【００１８】 有利には本発明による装置は、酸化窒素−酸化ユニットを有しており、この場
合、この酸化窒素−酸化ユニットは排ガス流内で、一酸化窒素（ＮＯ）から二酸
化窒素（ＮＯ２）を増やして、酸素（Ｏ２）を発生させる。後置接続された粒子
フィルタ内で、逆の過程が行われ、自由になった酸素原子は、低い排ガス温度に
おいても既に煤煙の炭素を燃焼させるので、確実な粒子フィルタ再生が保証され
る。しかしながらこの場合、比較的硫黄の少ないディーゼル燃料が使用され、そ
れによって酸化窒素−酸化ユニットの持続的な損傷は避けられる。Advantageously, the device according to the invention comprises a nitric oxide-oxidation unit, which is in the exhaust gas stream from nitric oxide (NO) to nitrogen dioxide (NO 2). ) Is increased to generate oxygen (O 2 ). The reverse process takes place in the downstream particle filter, where the freed oxygen atoms already burn the soot carbon even at low exhaust gas temperatures, thus ensuring a reliable particle filter regeneration. However, in this case, a diesel fuel with a relatively low sulfur content is used, whereby permanent damage to the nitric oxide-oxidation unit is avoided.

【００１９】 有利には、この装置は被覆された粒子フィルタを有しており、これによって低
い煤煙酸化温度のさらなる低下が保証される。触媒で被覆された壁部の再生は、
比較的ゆっくりと行われるので、有利には相応の物質の完全な変換が行われる。Advantageously, the device has a coated particle filter, which ensures a further reduction of the low soot oxidation temperature. Regeneration of the catalyst coated wall
Since it takes place relatively slowly, a complete conversion of the corresponding substances is preferably carried out.

【００２０】 本発明の特別な実施態様によれば、この装置は加熱装置を有している。例えば
電気的なヒータによって、困難な運転条件下例えば常温始動、燃料カットオフ時
その他においても確実な粒子フィルタ再生が保証される。しかも、触媒式のバー
ナは比較的迅速に最適な運転温度にもたらされる。According to a special embodiment of the invention, the device comprises a heating device. For example, an electric heater ensures reliable particle filter regeneration even under difficult operating conditions, such as cold start, fuel cutoff, and the like. Moreover, the catalytic burner brings the operating temperature to the optimum operating temperature relatively quickly.

【００２１】 前記本発明は、例えば自動車の内燃機関においてみられるような、特に迅速な
負荷交換時、常温始動時、エンジンブレーキ作動時又は種々異なる回転数による
運転時等の最も困難な条件下においても、確実な粒子フィルタ再生が保証される
。The present invention is particularly useful under the most difficult conditions, such as those found in an internal combustion engine of an automobile, such as a rapid load exchange, a room temperature start, an engine brake operation, or an operation at various rotational speeds. Also, reliable particle filter regeneration is guaranteed.

【００２２】 実施例 本発明の実施例が図面に示されていて、以下に詳しく説明されている。[0022]   Example   Embodiments of the invention are shown in the drawings and are explained in more detail below.

【００２３】 図１は、排ガスを処理するための本発明による装置の概略図、 図２は、酸化窒素−酸化ユニットと加熱装置とを備えた本発明による装置の変
化実施例の概略図、 図３は、被覆された粒子フィルタを備えた本発明による装置の第２の変化実施
例の概略図である。FIG. 1 is a schematic view of a device according to the invention for treating exhaust gas, FIG. 2 is a schematic view of a variant embodiment of the device according to the invention with a nitric oxide-oxidation unit and a heating device, 3 is a schematic view of a second variant embodiment of the device according to the invention with a coated particle filter.

【００２４】 図１には、排ガスを処理するための装置１が示されており、この場合、排ガス
２（約２００℃の温度）は触媒式のバーナ３にぶつかり、次いで粒子フィルタ４
を貫流する。触媒式バーナ３の前では燃料調量装置５によって燃料が拡散するの
で、排ガス２は触媒式のバーナ３内で燃料（ＨＣ）の酸化に従って水（Ｈ２Ｏ）
と二酸化炭素（ＣＯ２）に還元され、それによって解放された熱が約６００℃に
加熱される。この排ガス温度において、粒子フィルタ４内でディーゼル煤煙の炭
素（Ｃ）が、排ガス２内に存在する残留酸素（Ｏ２）と反応して、この時に二酸
化炭素（ＣＯ２）と化合する。この時に、例えば所定の排ガス圧力が得られた後
で、燃料（ＨＣ）が装置１に供給され、粒子フィルタ４が自由に燃焼するまで排
ガス流内で調量されて拡散し、この際に、供給の終わりにおいても圧力が制御さ
れる。FIG. 1 shows an apparatus 1 for treating exhaust gas, in which exhaust gas 2 (at a temperature of about 200 ° C.) hits a catalytic burner 3 and then a particle filter 4
Flow through. Since the fuel is diffused by the fuel metering device 5 in front of the catalytic burner 3, the exhaust gas 2 is converted into water (H 2 O) according to the oxidation of the fuel (HC) in the catalytic burner 3.
And it is reduced to carbon dioxide (CO 2), and it heat released by is heated to about 600 ° C.. At this exhaust gas temperature, the carbon (C) of diesel soot reacts in the particle filter 4 with the residual oxygen (O 2 ) present in the exhaust gas 2 and at this time combines with carbon dioxide (CO 2 ). At this time, for example, after a predetermined exhaust gas pressure is obtained, fuel (HC) is supplied to the device 1 and is metered and diffused in the exhaust gas flow until the particle filter 4 is free to combust, at which time, The pressure is also controlled at the end of the feed.

【００２５】 図２には、装置１のさらに別の実施例が示されており、この場合、図１に示し
た装置と比較して、触媒式のバーナ３に付加的に加熱装置６が配置され、触媒式
のバーナ３と粒子フィルタ４との間に酸化窒素−酸化ユニット７が配置されてい
る。例えば常温始動又は燃料カットオフ時等の自動車のエンジンの所定の運転条
件ためには、排ガス２を付加的に加熱する必要がある。従って、例えば車両内部
電源例えばバッテリー又は発電機によって供給される加熱装置６によって、困難
な運転条件下においても確実な粒子濾過が保証される。さらにまた必要であれば
、加熱装置６によって触媒式のバーナ３が加熱されるので、供給された燃料の最
適な酸化が保証される。FIG. 2 shows a further exemplary embodiment of the device 1, in which a heating device 6 is additionally arranged in the catalytic burner 3 compared to the device shown in FIG. The nitric oxide-oxidation unit 7 is arranged between the catalytic burner 3 and the particle filter 4. Exhaust gas 2 must be additionally heated for certain operating conditions of the engine of the vehicle, such as a cold start or fuel cut-off. Thus, for example, a heating device 6 supplied by a vehicle internal power supply, for example a battery or a generator, ensures reliable particle filtration even under difficult driving conditions. Furthermore, if necessary, the catalytic burner 3 is heated by the heating device 6 to ensure optimum oxidation of the fuel supplied.

【００２６】 酸化窒素−酸化ユニット７によって、排ガス２の一酸化窒素（ＮＯ）が二酸化
窒素（ＮＯ２）に酸化される。有利には粒子フィルタ４内の残滓煤煙は約２５０
℃の排ガス温度以下で連続的に燃焼する。触媒式のバーナは、この温度が長時間
に亘って得られない場合にだけ、作動接続される。The nitric oxide-oxidation unit 7 oxidizes the nitric oxide (NO) of the exhaust gas 2 into nitrogen dioxide (NO 2 ). Advantageously, the residual soot in the particle filter 4 is about 250
It burns continuously below the exhaust gas temperature of ℃. Catalytic burners are only activated if this temperature is not available for a long time.

【００２７】 図３に示した実施例は、図１に示した実施例と比較して粒子フィルタ４の代わ
りに被覆された粒子フィルタ８を有している。この場合、被覆された粒子フィル
タ８は、図２に示した粒子フィルタ４と酸化窒素−酸化ユニット７とを１つに組
み合わせて構成されているので、被覆された粒子フィルタ８内で一酸化窒素（Ｎ
Ｏ）が二酸化窒素（ＮＯ２）に酸化され、次いでこの二酸化窒素が煤煙を次の反
応式に従って酸化する。The embodiment shown in FIG. 3 has a coated particle filter 8 instead of the particle filter 4 as compared to the embodiment shown in FIG. In this case, the coated particle filter 8 is configured by combining the particle filter 4 and the nitric oxide-oxidation unit 7 shown in FIG. (N
O) is oxidized to nitrogen dioxide (NO2), which in turn oxidizes soot according to the following reaction equation:

【００２８】 ２ＮＯ ＋ Ｃ ＋ Ｏ２ → ２ＮＯ２ ＋ Ｃ → ２ＮＯ ＋ ＣＯ２ その他の酸化窒素処理は場合によっては後続段階で行われる。さらに有利には
触媒で被覆することによって、煤煙を直接酸化させるために必要な温度を低下さ
せる。2NO + C + O 2 → 2NO 2 + C → 2NO + CO 2 Other nitric oxide treatments are optionally carried out in subsequent stages. More advantageously, the coating with a catalyst reduces the temperature required for the direct oxidation of soot.

【００２９】 触媒式のバーナ３のための燃料は、必要な排ガス濾過システムにおいて、有利
にはガス状で、また液体状で供給することができる。この場合、燃料供給は周期
的にもまた連続的にも行われる。The fuel for the catalytic burner 3 can be supplied in the required exhaust gas filtration system, preferably in gaseous form and in liquid form. In this case, the fuel is supplied both periodically and continuously.

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

【図１】 排ガスを処理するための本発明による装置の概略図である。[Figure 1]   1 is a schematic view of an apparatus according to the invention for treating exhaust gas.

【図２】 酸化窒素−酸化ユニットと加熱装置とを備えた本発明による装置の変化実施例
の概略図である。FIG. 2 is a schematic view of a variant embodiment of the device according to the invention with a nitric oxide-oxidation unit and a heating device.

【図３】 被覆された粒子フィルタを備えた本発明による装置の第２の変化実施例の概略
図である。FIG. 3 is a schematic view of a second variant embodiment of the device according to the invention with a coated particle filter.

Claims (9)

【特許請求の範囲】[Claims] 【請求項１】 粒子フィルタ（４）を備えた、内燃機関特にディーゼル内燃
機関の排ガスを処理するための装置において、触媒式のバーナ（３）を有してお
り、該バーナ（３）が内燃機関と粒子フィルタ（４）との間に配置されているこ
とを特徴とする、排ガスを処理するための装置。1. An apparatus for treating exhaust gas of an internal combustion engine, in particular a diesel internal combustion engine, comprising a particle filter (4), comprising a catalytic burner (3), the burner (3) being an internal combustion engine. Device for treating exhaust gas, characterized in that it is arranged between the engine and the particle filter (4). 【請求項２】 内燃機関とバーナ（３）との間に燃料調量装置（５）が配置
されている、請求項１記載の装置。2. The device according to claim 1, wherein a fuel metering device (5) is arranged between the internal combustion engine and the burner (3). 【請求項３】 燃料調量装置（５）が燃料拡散ユニットを有している、請求
項１又は２記載の装置。3. Device according to claim 1, wherein the fuel metering device (5) comprises a fuel diffusion unit. 【請求項４】 燃料調量装置（５）を制御するための制御装置が設けられて
いる、請求項１から３までのいずれか１項記載の装置。4. The device according to claim 1, further comprising a control device for controlling the fuel metering device. 【請求項５】 前記装置（１）が酸化窒素−酸化ユニット（７）を有してい
る、請求項１から４までのいずれか１項記載の装置。5. Device according to claim 1, wherein the device (1) comprises a nitric oxide-oxidation unit (7). 【請求項６】 前記装置（１）が被覆された粒子フィルタ（８）を有してい
る、請求項１から５までのいずれか１項記載の装置。6. The device according to claim 1, wherein the device (1) has a coated particle filter (8). 【請求項７】 前記装置（１）が加熱装置（６）を有している、請求項１か
ら６までのいずれか１項記載の装置。7. Device according to claim 1, wherein the device (1) comprises a heating device (6). 【請求項８】 請求項１から７までのいずれか１項記載の装置（１）が設け
られていることを特徴とする車両。8. A vehicle, characterized in that it is provided with a device (1) according to any one of claims 1 to 7. 【請求項９】 粒子フィルタ（４）を備えた、内燃機関特にディーゼル内燃
機関の排ガスを処理するための方法において、請求項１から８までのいずれか１
項記載の装置（１）を使用することを特徴とする、排ガスを処理するための方法
。9. A method for treating exhaust gas of an internal combustion engine, in particular a diesel internal combustion engine, comprising a particle filter (4).
Process for treating exhaust gas, characterized in that the device (1) according to paragraph (1) is used.
JP2001584717A 2000-05-17 2001-05-11 Equipment for treating exhaust gas Pending JP2003533626A (en)

Applications Claiming Priority (3)

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DE10024254.5 2000-05-17
DE10024254A DE10024254A1 (en) 2000-05-17 2000-05-17 Exhaust gas treatment device
PCT/DE2001/001806 WO2001088346A1 (en) 2000-05-17 2001-05-11 Device for treating exhaust gases

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DE (1) DE10024254A1 (en)
WO (1) WO2001088346A1 (en)

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