JPH05133218A - Exhaust emission control device using fuel reforming/ reducing agent - Google Patents

Exhaust emission control device using fuel reforming/ reducing agent

Info

Publication number
JPH05133218A
JPH05133218A JP29880591A JP29880591A JPH05133218A JP H05133218 A JPH05133218 A JP H05133218A JP 29880591 A JP29880591 A JP 29880591A JP 29880591 A JP29880591 A JP 29880591A JP H05133218 A JPH05133218 A JP H05133218A
Authority
JP
Japan
Prior art keywords
reducing agent
fuel
engine
exhaust gas
catalyst
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
JP29880591A
Other languages
Japanese (ja)
Other versions
JPH0629547B2 (en
Inventor
Moriyasu Yagi
屋宜盛康
Toshio Nakahira
中平敏夫
Masanori Komori
小森正憲
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.)
SHINNENSHIYOU SYST KENKYUSHO KK
SHINNENSHO SYSTEM KENKYUSHO
Original Assignee
SHINNENSHIYOU SYST KENKYUSHO KK
SHINNENSHO SYSTEM KENKYUSHO
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 SHINNENSHIYOU SYST KENKYUSHO KK, SHINNENSHO SYSTEM KENKYUSHO filed Critical SHINNENSHIYOU SYST KENKYUSHO KK
Priority to JP29880591A priority Critical patent/JPH0629547B2/en
Publication of JPH05133218A publication Critical patent/JPH05133218A/en
Publication of JPH0629547B2 publication Critical patent/JPH0629547B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Exhaust Gas After Treatment (AREA)

Abstract

PURPOSE:To solve problems of maintenance and supply of reducing agents and keep a reducing effect of a catalyst even in the case of variations in an operating condition of an engine by manufacturing the reducing agents on a vehicle. CONSTITUTION:An engine 1 for a vehicle where fuel including mainly hydrocarbon is used is provided with a catalyst device 3 disposed in an exhaust pipe 2 of the engine 1, a fuel reformer 6 for reforming the fuel to plural kinds of reducing agents, and atomizers 8, 9 for atomizing the reducing agents upstream of the catalyst device. The reducing agent is a mixture of at least two or more kinds of aliphatic hydrocarbon and alcohol and has a high NOx decreasing effect within respective temperature ranges in the case of a fluctuation in exhaust gas temperature.

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、炭化水素を主成分とす
る燃料を使用する車両用エンジンに適用され、エンジン
排気中の窒素酸化物(以下、NOX という)を燃料改質
還元剤を用いて触媒により低減する装置に関する。
BACKGROUND OF THE INVENTION This invention is applied to a vehicle engine using a fuel composed mainly of hydrocarbons, nitrogen oxides in the engine exhaust (hereinafter referred to as NO X) to the fuel reforming reducing agent The present invention relates to an apparatus for reducing with a catalyst.

【0002】[0002]

【従来の技術】従来、エンジン排気中のNOX を低減す
るために、燃焼改善による方式や還元触媒による方式
等、種々の研究開発が行われており、このうち還元触媒
による方式においては、触媒材料の研究開発や特定の触
媒のもとNOX の選択還元を行わせる還元剤の研究開発
が行われている。
2. Description of the Related Art Conventionally, in order to reduce NO x in engine exhaust, various researches and developments such as a combustion improvement system and a reduction catalyst system have been carried out. Research and development of materials and research and development of reducing agents that perform selective reduction of NO x under a specific catalyst are being carried out.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、図4A
に示すように、還元触媒を単独で使用した場合には、N
X 低減率が低く触媒の容量が大きくなったり、使用す
る条件によっては十分な効果が得られないという問題を
有し、また、図4Bに示すように、例えば軽油燃料をそ
のまま還元剤として使用した場合には、燃料が十分に還
元剤として機能しないので、あまり効果が上がらないと
いう問題を有している。
However, as shown in FIG.
As shown in, when the reducing catalyst is used alone, N
O X or capacity reduction rate is low catalyst increases, a problem that sufficient effect can not be obtained depending on the conditions used, and as shown in FIG. 4B, for example, using a gas oil fuel as it is a reducing agent In that case, the fuel does not function sufficiently as a reducing agent, so that there is a problem that the effect is not improved so much.

【0004】また、図4Cに示すように、触媒の効果を
上げるために、プロピレン等の特別の還元剤を使用する
と、NOX 低減率は増大するが、その還元剤のための保
守、補給の問題を有し、車両用エンジンとしては不向き
であり、実用化には到っていない。さらに、車両用エン
ジンにおいては、運転条件が一定でなく、排気ガス温度
が変動するため、図4Cに示すように、或る温度範囲で
はNOX 低減率が低下し、触媒上での反応が十分に行わ
れない場合、未反応の還元剤が大気中に流出してしまう
という問題を有している。
Further, as shown in FIG. 4C, if a special reducing agent such as propylene is used in order to improve the effect of the catalyst, the NO x reduction rate increases, but maintenance and replenishment for the reducing agent are increased. It has a problem and is unsuitable for a vehicle engine, and has not been put to practical use. Furthermore, in the vehicle engine, the operating conditions are not constant and the exhaust gas temperature fluctuates, so the NO X reduction rate decreases in a certain temperature range, as shown in FIG. 4C, and the reaction on the catalyst is sufficient. If not carried out, there is a problem that unreacted reducing agent flows out into the atmosphere.

【0005】本発明は、上記問題を解決するものであ
り、炭化水素を主成分とする燃料を使用する車両用エン
ジンに適用され、エンジン排気中のNOX を燃料改質還
元剤を用いて処理する装置であって、車両上で還元剤を
製造することにより、還元剤の保守、補給の問題を解決
し、また、エンジン運転条件が変動しても常に触媒の還
元効果を維持させ、効率良くNOX を低減させることが
できる排ガス浄化装置を提供することを目的とする。
The present invention is to solve the above problems and is applied to a vehicle engine using a fuel containing hydrocarbon as a main component, and treats NO X in the engine exhaust with a fuel reforming reducing agent. By reducing the agent on the vehicle, the problem of maintenance and replenishment of the reducing agent is solved, and the reducing effect of the catalyst is always maintained even if the engine operating conditions fluctuate, and the efficiency is improved. It is an object of the present invention to provide an exhaust gas purification device that can reduce NO X.

【0006】[0006]

【課題を解決するための手段】そのために本発明の燃料
改質還元剤を用いる排ガス浄化装置は、炭化水素を主成
分とする燃料を使用する車両用エンジンにおいて、エン
ジン1の排気管2に配設される触媒装置3と、前記燃料
を複数種類の還元剤に改質する燃料改質器6と、前記還
元剤を触媒装置の上流側に噴霧する噴霧装置8、9とを
備え、前記還元剤は、脂肪族炭化水素およびアルコール
のうち少なくとも2種類以上の混合物であり、かつ、排
気ガス温度が変動した場合にそれぞれの温度範囲におい
てNOX 低減効果の高い還元剤であることを特徴とす
る。
To this end, an exhaust gas purifying apparatus using a fuel reforming / reducing agent of the present invention is arranged in an exhaust pipe 2 of an engine 1 in a vehicle engine using a fuel containing hydrocarbon as a main component. The catalyst device 3 is provided, a fuel reformer 6 that reforms the fuel into a plurality of types of reducing agents, and spray devices 8 and 9 that spray the reducing agent to the upstream side of the catalyst device. The agent is a mixture of at least two kinds or more of an aliphatic hydrocarbon and an alcohol, and is a reducing agent having a high NO X reducing effect in each temperature range when the exhaust gas temperature changes. ..

【0007】好適な実施例として、前記脂肪族炭化水素
は、飽和炭化水素としては炭素数が3以上であり、不飽
和炭化水素としては炭素数が2であること、または、分
枝を分子内にもつものが挙げられる。また、前記触媒装
置3は、還元触媒部3aとその下流側に配設される酸化
触媒部3bとを備える。なお、上記構成に付加した番号
は、理解を容易にするために図面と対比させるためのも
ので、これにより本発明の構成が何ら限定されるもので
はない。
In a preferred embodiment, the aliphatic hydrocarbon has 3 or more carbon atoms as a saturated hydrocarbon and 2 carbon atoms as an unsaturated hydrocarbon, or has a branched intramolecular structure. The ones with Further, the catalyst device 3 includes a reduction catalyst portion 3a and an oxidation catalyst portion 3b arranged downstream thereof. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings for easy understanding, and the configurations of the present invention are not limited thereby.

【0008】[0008]

【作用】本発明においては、刻々と変化するエンジン回
転数、エンジン負荷および排気ガス温度の検出信号か
ら、エンジン排気中のNOX の排出量および濃度を演算
し、これによりNOX を最も浄化する還元剤噴霧量を決
定し、排気管内に噴霧された還元剤は、還元触媒部にお
いて排ガス中のNOX が選択的に還元される。このと
き、図2に示すように、エンジンの運転条件によって排
気ガス温度が変動しても、それぞれの温度範囲において
最もNOX 低減効果の高い還元剤A、B、Cが混合され
ているため、低温度では還元剤Aにより、中間温度では
還元剤Bにより、高温度では還元剤Cにより効果的にN
X が除去されることになる。
In the present invention, the emission amount and concentration of NO X in the engine exhaust are calculated from the detection signals of the engine speed, engine load and exhaust gas temperature, which change every moment, to purify NO X most. The reducing agent spray amount is determined, and as for the reducing agent sprayed into the exhaust pipe, NO X in the exhaust gas is selectively reduced in the reduction catalyst section. At this time, as shown in FIG. 2, even if the exhaust gas temperature fluctuates depending on the operating conditions of the engine, the reducing agents A, B, and C having the highest NO x reduction effect are mixed in each temperature range. Effectively with reducing agent A at low temperature, reducing agent B at intermediate temperature and reducing agent C at high temperature.
O X will be removed.

【0009】[0009]

【実施例】以下本発明の実施例を図面を参照しつつ説明
する。図1は本発明の燃料改質還元剤を用いる排ガス浄
化装置の1実施例を示す構成図である。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of an exhaust gas purifying apparatus using the fuel reforming reducing agent of the present invention.

【0010】ディーゼルエンジン1の排気管2の途中に
は、還元触媒部3aおよび酸化触媒部3bを備える触媒
装置3が配設される。ディーゼルエンジン1には、燃料
タンク4が接続され軽油燃料が供給される。また、燃料
タンク4内の軽油は、燃料ポンプ5により燃料改質器6
に送られ、ここで軽油を後述する還元剤に改質し、還元
剤を還元剤タンク7に貯蔵する。還元剤タンク7内の還
元剤は、還元剤用ポンプ8の制御により噴霧ノズル9か
ら、触媒装置3の上流側で排気管2内に噴霧される。電
子制御装置10は、エンジン回転数、エンジン負荷およ
び排気ガス温度により還元剤用ポンプ8を制御し、所定
量の還元剤を噴霧する。
A catalyst device 3 having a reduction catalyst portion 3a and an oxidation catalyst portion 3b is arranged in the exhaust pipe 2 of the diesel engine 1. A fuel tank 4 is connected to the diesel engine 1 to supply light oil fuel. Further, the light oil in the fuel tank 4 is supplied to the fuel reformer 6 by the fuel pump 5.
The light oil is reformed into a reducing agent described later, and the reducing agent is stored in the reducing agent tank 7. The reducing agent in the reducing agent tank 7 is sprayed into the exhaust pipe 2 on the upstream side of the catalyst device 3 from the spraying nozzle 9 under the control of the reducing agent pump 8. The electronic control unit 10 controls the reducing agent pump 8 according to the engine speed, the engine load, and the exhaust gas temperature to spray a predetermined amount of reducing agent.

【0011】次に、前記燃料改質器6にて合成する還元
剤について説明する。還元剤として必要な性能は、触媒
のNOX 浄化能を効果的に引き出すものであるが、図4
Cで説明したように、単一の化合物では、触媒の活性を
示す温度範囲が狭いので、本発明においては、図2に示
すように、エンジンの運転条件によって排気ガス温度が
変動しても、それぞれの温度範囲において最もNOX
減効果の高い還元剤A、B、Cを混合するようにする。
この低減特性は、使用する触媒材料によっても大きく相
違するため、それぞれの触媒材料に応じて、実験により
温度とNOX 低減率との関係を求め、還元剤を選定する
ことになる。このように、還元剤を選定、混合しておけ
ば、低温度では還元剤Aにより、中間温度では還元剤B
により、高温度では還元剤Cにより効果的にNOX が除
去されることになる。
Next, the reducing agent synthesized in the fuel reformer 6 will be described. The performance required as a reducing agent is to effectively bring out the NO x purification ability of the catalyst.
As described in C, a single compound has a narrow temperature range showing the activity of the catalyst. Therefore, in the present invention, as shown in FIG. 2, even if the exhaust gas temperature varies depending on the engine operating conditions, The reducing agents A, B, and C having the highest NO x reduction effect in each temperature range are mixed.
Since this reduction characteristic greatly differs depending on the catalyst material used, the reducing agent is selected by experimentally determining the relationship between the temperature and the NO x reduction rate according to each catalyst material. As described above, if the reducing agents are selected and mixed, the reducing agent A is used at a low temperature and the reducing agent B is used at an intermediate temperature.
Thus, at high temperature, the reducing agent C effectively removes NO x .

【0012】前記還元剤の混合物を軽油から製造する例
を図3により説明する。先ず、軽油の主成分であるアル
カンを接触分解および脱水素化により、数種類の脂肪族
炭化水素に低級化(炭素数2〜10程度)する。同時に
2、CO、H2Oが生成される。この反応は、450℃
〜550℃の温度下でゼオライト系、鉄系の触媒を用い
る。次に、生成した脂肪族炭化水素のうち不飽和炭化水
素にH2 、COを加えてアルデヒドを生成し、さらに、
アルデヒドにH2 を加えてアルコールを製造する。この
反応は、100℃〜200℃の温度、50〜200at
mの圧力下でCO、Rh系の触媒を用いる。
An example of producing the mixture of the reducing agents from light oil will be described with reference to FIG. First, the alkane, which is the main component of light oil, is catalytically cracked and dehydrogenated to lower it into several kinds of aliphatic hydrocarbons (having about 2 to 10 carbon atoms). At the same time, H 2 , CO and H 2 O are produced. This reaction is 450 ℃
Zeolite-based and iron-based catalysts are used at a temperature of ˜550 ° C. Next, H 2 and CO are added to unsaturated hydrocarbons among the produced aliphatic hydrocarbons to produce aldehydes,
In addition of H 2 to produce the alcohol to the aldehyde. This reaction is carried out at a temperature of 100 ° C. to 200 ° C. and 50 to 200 at.
Under a pressure of m, a C 2 O , R h type catalyst is used.

【0013】好適な還元剤の実施例を示すと、低級脂肪
族炭化水素のうち飽和炭化水素としては、炭素数が3〜
10程度のもの、また、不飽和炭化水素としては、炭素
数が2〜10程度のもの、さらに、分枝を分子内にもつ
ものも有効である。さらに、アルコール類も低温活性の
向上に有効であるので、これらの混合物を燃料改質器6
にて合成し還元剤として使用する。
As a preferred example of the reducing agent, the saturated hydrocarbon among the lower aliphatic hydrocarbons has 3 to 3 carbon atoms.
It is also effective that the unsaturated hydrocarbon has about 10 carbon atoms, and the unsaturated hydrocarbon has about 2 to 10 carbon atoms and further has a branch in the molecule. Furthermore, since alcohols are also effective in improving low temperature activity, these mixtures are used as fuel reformer 6.
And used as a reducing agent.

【0014】上記構成からなる本発明の作用について説
明すると、電子制御装置10においては、刻々と変化す
るエンジン回転数、エンジン負荷および排気ガス温度の
検出信号から、エンジン排気中のNOX の排出量および
濃度を演算し、これによりNOX を最も浄化する還元剤
噴霧量を決定し、還元剤用ポンプ8を制御する。噴霧ノ
ズル9から排気管2内に噴霧された還元剤は、排ガス中
に均一に分布され、触媒装置3内の還元触媒部3aにお
いて、排ガス中のNOX が選択的に還元される。エンジ
ンの運転条件によって排気ガス温度が変動しても、それ
ぞれの温度範囲において最もNOX 低減効果の高い還元
剤が混合されているため、効果的にNOX を除去でき
る。
[0014] To describe the operation of the present invention configured as described above, in the electronic control unit 10, an engine rotational speed that changes every moment, from the detection signal of the engine load and exhaust gas temperature, emissions of the NO X in the engine exhaust And the concentration are calculated to determine the reducing agent spraying amount that most purifies NO X , and the reducing agent pump 8 is controlled. The reducing agent sprayed from the spray nozzle 9 into the exhaust pipe 2 is uniformly distributed in the exhaust gas, and NO x in the exhaust gas is selectively reduced in the reduction catalyst section 3a in the catalyst device 3. Even if the exhaust gas temperature fluctuates depending on the engine operating conditions, the reducing agent that has the highest NO X reduction effect is mixed in each temperature range, so NO X can be effectively removed.

【0015】前記還元触媒部3aの下流側には、酸化触
媒部3bが設けられている。排ガス雰囲気の急激な変化
により、触媒上で還元剤の吸着離脱が起こると、還元剤
は酸化触媒部3bにおいて酸化分解され、浄化ガス中に
還元剤が流出しないようにしている。また、酸化触媒部
3bにおいては、排ガス中の未燃焼燃料、潤滑油等の成
分も浄化できる。
An oxidation catalyst portion 3b is provided on the downstream side of the reduction catalyst portion 3a. When the reducing agent is adsorbed and desorbed on the catalyst due to a sudden change in the exhaust gas atmosphere, the reducing agent is oxidatively decomposed in the oxidation catalyst portion 3b so that the reducing agent does not flow into the purified gas. In addition, in the oxidation catalyst portion 3b, components such as unburned fuel and lubricating oil in exhaust gas can be purified.

【0016】なお、本発明は上記実施例に限定されるも
のではなく種々の変更が可能である。例えば、上記実施
例においては、ディーゼルエンジンを例にして説明して
いるが、ガソリン等、他の炭化水素燃料を使用するエン
ジンにも適用可能である。また、排気管内にNOX 濃度
センサを設け、還元剤の噴霧量を制御してもよい。ま
た、還元剤用ポンプの代わりに電磁弁を使用するように
してもよい。
The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above-described embodiment, the diesel engine is described as an example, but the present invention can be applied to an engine using other hydrocarbon fuel such as gasoline. Further, a NO x concentration sensor may be provided in the exhaust pipe to control the spray amount of the reducing agent. An electromagnetic valve may be used instead of the reducing agent pump.

【0017】[0017]

【発明の効果】以上の説明から明らかなように本発明に
よれば、炭化水素を主成分とする燃料を使用する車両用
エンジンにおいて、エンジンの排気管に配設される触媒
装置と、前記燃料を複数種類の還元剤に改質する燃料改
質器と、前記還元剤を触媒装置の上流側に噴霧する噴霧
装置とを備え、前記還元剤は、脂肪族炭化水素およびア
ルコールのうち少なくとも2種類以上の混合物であり、
かつ、排気ガス温度が変動した場合にそれぞれの温度範
囲においてNOX 低減効果の高い還元剤であることを特
徴とするため、既に補給体制が整備されている炭化水素
を主成分とする燃料を車両上で改質してNOX の還元剤
として使用するため、新たに周辺設備を社会的に整備し
直すことなく装置を導入でき、また、燃料とは別に還元
剤を補給する必要がない。
As is apparent from the above description, according to the present invention, in a vehicle engine using a fuel containing hydrocarbon as a main component, a catalyst device arranged in an exhaust pipe of the engine, and the fuel A fuel reformer for reforming the reducing agent into a plurality of reducing agents, and a spraying device for spraying the reducing agent on the upstream side of the catalyst device, wherein the reducing agent is at least two types of aliphatic hydrocarbon and alcohol. Is a mixture of the above,
In addition, since it is a reducing agent that has a high NO X reduction effect in each temperature range when the exhaust gas temperature fluctuates, the fuel mainly composed of hydrocarbons, for which the replenishment system has already been established, is used in the vehicle. Since it is reformed above and used as a reducing agent for NO X, the apparatus can be introduced without newly re-developing peripheral equipment, and it is not necessary to replenish the reducing agent separately from the fuel.

【0018】また、エンジンの運転条件によって排気ガ
ス温度が変動しても、それぞれの温度範囲において最も
NOX 低減効果の高い還元剤が混合されているため、効
果的にNOX を除去できるとともに、単一の還元剤と比
較してその必要量を低減させることができ、また、燃費
に対する影響を少なくすることができる。
Even if the exhaust gas temperature fluctuates depending on the engine operating conditions, the reducing agent having the highest NO X reduction effect is mixed in each temperature range, so that NO X can be effectively removed, and The required amount can be reduced as compared with a single reducing agent, and the influence on fuel consumption can be reduced.

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

【図1】本発明の燃料改質還元剤を用いる排ガス浄化装
置の1実施例を示す構成図
FIG. 1 is a configuration diagram showing an embodiment of an exhaust gas purifying apparatus using a fuel reforming reducing agent of the present invention.

【図2】本発明におけるNOX 低減効果を説明するため
の図
FIG. 2 is a diagram for explaining the NO X reduction effect in the present invention.

【図3】本発明に係わる燃料改質器における軽油からの
還元剤の製造工程を示す図
FIG. 3 is a diagram showing a process for producing a reducing agent from light oil in the fuel reformer according to the present invention.

【図4】図Aは還元触媒を単独で使用した場合のNOX
低減効果を示す図図Bは軽油を還元剤として使用した場
合のNOX 低減効果を示す図図Cはプロピレンを還元剤
としてを使用した場合のNOX 低減効果を示す図
FIG. 4 is a graph showing NO x when a reducing catalyst is used alone.
Figure B shows the reduction effect Figure B shows the NO X reduction effect when using light oil as the reducing agent Figure C shows the NO X reduction effect when using propylene as the reducing agent

【符号の説明】[Explanation of symbols]

1…エンジン、2…排気管、3…触媒装置、3a…還元
触媒部 3b…酸化触媒部、4…燃料タンク、5…ポンプ、6…
燃料改質器 7…還元剤タンク、8…還元剤用ポンプ、9…噴霧ノズ
ル 10…電子制御装置
DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Exhaust pipe, 3 ... Catalyst device, 3a ... Reduction catalyst part 3b ... Oxidation catalyst part, 4 ... Fuel tank, 5 ... Pump, 6 ...
Fuel reformer 7 ... Reductant tank, 8 ... Reductant pump, 9 ... Spray nozzle 10 ... Electronic control device

───────────────────────────────────────────────────── フロントページの続き (72)発明者 小森正憲 茨城県つくば市苅間2530番地 財団法人 日本自動車研究所内 株式会社新燃焼シス テム研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanori Komori Inventor Masanori Komori 2530, Kuma, Tsukuba, Ibaraki Japan Automobile Research Institute, Inc. Shin Combustion System Research Institute, Inc.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】炭化水素を主成分とする燃料を使用する車
両用エンジンにおいて、エンジンの排気管に配設される
触媒装置と、前記燃料を複数種類の還元剤に改質する燃
料改質器と、前記還元剤を触媒装置の上流側に噴霧する
噴霧装置とを備え、前記還元剤は、脂肪族炭化水素およ
びアルコールのうち少なくとも2種類以上の混合物であ
り、かつ、排気ガス温度が変動した場合にそれぞれの温
度範囲においてNOX 低減効果の高い還元剤であること
を特徴とする燃料改質還元剤を用いる排ガス浄化装置。
1. A vehicle engine that uses a fuel containing hydrocarbon as a main component, and a catalyst device disposed in an exhaust pipe of the engine, and a fuel reformer for reforming the fuel into a plurality of types of reducing agents. And a spraying device for spraying the reducing agent on the upstream side of the catalyst device, wherein the reducing agent is a mixture of at least two kinds of an aliphatic hydrocarbon and an alcohol, and the exhaust gas temperature fluctuates. In this case, an exhaust gas purifying apparatus using a fuel reforming reducing agent, which is a reducing agent having a high NO X reducing effect in each temperature range.
【請求項2】前記脂肪族炭化水素は、飽和炭化水素とし
ては炭素数が3以上であり、不飽和炭化水素としては炭
素数が2であること、または、分枝を分子内にもつこと
を特徴とする請求項1に記載の燃料改質還元剤を用いる
排ガス浄化装置。
2. The aliphatic hydrocarbon has 3 or more carbon atoms as a saturated hydrocarbon and 2 carbon atoms as an unsaturated hydrocarbon, or has a branch in the molecule. An exhaust gas purifying apparatus using the fuel reforming reducing agent according to claim 1.
【請求項3】前記触媒装置は、還元触媒部とその下流側
に配設される酸化触媒部とを備えることを特徴とする請
求項1または2に記載の燃料改質還元剤を用いる排ガス
浄化装置。
3. The exhaust gas purification using the fuel reforming reducing agent according to claim 1, wherein the catalyst device includes a reduction catalyst portion and an oxidation catalyst portion arranged downstream thereof. apparatus.
JP29880591A 1991-11-14 1991-11-14 Exhaust gas purification device using fuel reforming reducing agent Expired - Lifetime JPH0629547B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29880591A JPH0629547B2 (en) 1991-11-14 1991-11-14 Exhaust gas purification device using fuel reforming reducing agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29880591A JPH0629547B2 (en) 1991-11-14 1991-11-14 Exhaust gas purification device using fuel reforming reducing agent

Publications (2)

Publication Number Publication Date
JPH05133218A true JPH05133218A (en) 1993-05-28
JPH0629547B2 JPH0629547B2 (en) 1994-04-20

Family

ID=17864449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29880591A Expired - Lifetime JPH0629547B2 (en) 1991-11-14 1991-11-14 Exhaust gas purification device using fuel reforming reducing agent

Country Status (1)

Country Link
JP (1) JPH0629547B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996016255A1 (en) * 1994-11-18 1996-05-30 Komatsu Ltd. Exhaust denitration device for diesel engine
US5894728A (en) * 1995-06-27 1999-04-20 Komatsu Ltd. Exhaust emission control device for diesel engines
FR2821116A1 (en) * 2001-02-19 2002-08-23 Peugeot Citroen Automobiles Sa Regeneration of particle filter used with heat engine in a parallel hybrid motor vehicle, uses hydrogen, from fuel cell or reservoir, injected and burned in exhaust to ensure combustion of particles
US7763214B2 (en) 2005-09-26 2010-07-27 Denso Corporation Reducing agent forming device and exhaust gas control system using the same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996016255A1 (en) * 1994-11-18 1996-05-30 Komatsu Ltd. Exhaust denitration device for diesel engine
GB2308820A (en) * 1994-11-18 1997-07-09 Komatsu Mfg Co Ltd Exhaust denitration device for diesel engine
GB2308820B (en) * 1994-11-18 1998-08-26 Komatsu Mfg Co Ltd Exhaust denitration for diesel engines
US6006515A (en) * 1994-11-18 1999-12-28 Komatsu Ltd. Exhaust denitration device for diesel engine
US5894728A (en) * 1995-06-27 1999-04-20 Komatsu Ltd. Exhaust emission control device for diesel engines
DE19681452C2 (en) * 1995-06-27 1999-11-18 Komatsu Mfg Co Ltd Exhaust emission control device for diesel engines
FR2821116A1 (en) * 2001-02-19 2002-08-23 Peugeot Citroen Automobiles Sa Regeneration of particle filter used with heat engine in a parallel hybrid motor vehicle, uses hydrogen, from fuel cell or reservoir, injected and burned in exhaust to ensure combustion of particles
US7763214B2 (en) 2005-09-26 2010-07-27 Denso Corporation Reducing agent forming device and exhaust gas control system using the same

Also Published As

Publication number Publication date
JPH0629547B2 (en) 1994-04-20

Similar Documents

Publication Publication Date Title
CN1204960C (en) Waste gas treatment apparatus of selective catalytic reduction nitrogen oxide and its waste gas treatment method
US5586433A (en) Process and apparatus for selective catalyzed no-reduction in oxygen-containing exhaust gases
CN101219339B (en) Method and apparatus for selectively reducing NOx in an exhaust gas feedstream
US5921076A (en) Process and apparatus for reducing nitrogen oxides in engine emissions
US8091341B2 (en) Exhaust gas purification method and exhaust gas purification system
US7135153B2 (en) NOx reduction system for diesel engines, using hydrogen selective catalytic reduction
US6330794B1 (en) Method and apparatus for using free radicals to reduce pollutants in the exhaust gases from the combustion of a fuel
US7498010B2 (en) Catalytic reduction of NOx
JPH05106430A (en) Nitrogen oxide reducing device for internal combustion engine
KR20010075708A (en) STAGED REDUCTANT INJECTION FOR IMPROVED NOx REDUCTION
US20110120093A1 (en) Process and apparatus for purifying exhaust gases from an internal combustion engine
US8178460B2 (en) Exhaust treatment system and method of operation
JP2002106338A (en) Hydrogen contained gas producing apparatus and exhaust emission control system
US6399035B1 (en) Reduction purification method of nitrogen oxide-containing exhaust gas
US20120047877A1 (en) Exhaust treatment system and method of operation
JP4830570B2 (en) Exhaust gas purification system
JPH05133218A (en) Exhaust emission control device using fuel reforming/ reducing agent
JPH08266868A (en) Nitrogen oxide removing method and device therefor
EP0969914B1 (en) Emission control system for a lean-burn internal combustion engine
US20080261801A1 (en) Methods of Regenerating a Nox Absorbent
JPH05187230A (en) Exhaust emission purifier for internal combustion engine
JP2785471B2 (en) Exhaust gas purification device for internal combustion engine
JP2001140630A (en) Exhaust emission control device for internal combustion engine
JPH07100335A (en) Nitrogen oxide removing method
JPH07217424A (en) Fuel reforming device