FR2812342A1 - DEVICE FOR REDUCING HARMFUL COMPONENTS IN THE EXHAUST GAS OF AN INTERNAL COMBUSTION ENGINE, ESPECIALLY A DIESEL ENGINE - Google Patents
DEVICE FOR REDUCING HARMFUL COMPONENTS IN THE EXHAUST GAS OF AN INTERNAL COMBUSTION ENGINE, ESPECIALLY A DIESEL ENGINE Download PDFInfo
- Publication number
- FR2812342A1 FR2812342A1 FR0109860A FR0109860A FR2812342A1 FR 2812342 A1 FR2812342 A1 FR 2812342A1 FR 0109860 A FR0109860 A FR 0109860A FR 0109860 A FR0109860 A FR 0109860A FR 2812342 A1 FR2812342 A1 FR 2812342A1
- Authority
- FR
- France
- Prior art keywords
- exhaust gas
- catalytic converter
- oxidation
- converter
- catalytic
- 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.)
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Classifications
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- 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
- F01N3/0231—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 special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
-
- 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
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
Abstract
L'invention concerne un dispositif (1) qui est destin e à la r eduction de composants nocifs dans le gaz d' echappement d'un moteur à combustion interne (3), notamment d'un moteur diesel, et qui comporte une conduite de gaz d' echappement (2) dans laquelle sont mont es les uns derrière les autres dans le sens de l' ecoulement du gaz d' echappement un convertisseur catalytique à oxydation (5), un convertisseur catalytique (6) produisant du NO2 et un filtre à particules (7). Pour eviter ou au moins r eduire dans le convertisseur catalytique à NO2 une r eaction en retour de NO2 en NO, le convertisseur catalytique à oxydation (5) est un convertisseur catalytique r eduisant des hydrocarbures et/ ou du monoxyde de carbone.The invention relates to a device (1) which is intended for the reduction of harmful components in the exhaust gas of an internal combustion engine (3), in particular of a diesel engine, and which comprises a exhaust gas (2) in which are mounted one behind the other in the direction of the flow of the exhaust gas an oxidation catalytic converter (5), a catalytic converter (6) producing NO2 and a filter with particles (7). To avoid or at least reduce in the NO2 catalytic converter a back reaction of NO2 to NO, the oxidation catalytic converter (5) is a catalytic converter reducing hydrocarbons and/or carbon monoxide.
Description
L'invention se rapporte à un dispositif qui est destiné à la réduction deThe invention relates to a device which is intended for the reduction of
composants nocifs du gaz d'échappement d'un moteur à combustion interne, notamment d'un moteur diesel, et qui comporte une conduite de gaz d'échappement dans laquelle sont montés les uns derrière les autres dans la direction de l'écoulement du gaz d'échappement un convertisseur catalytique à oxydation, un convertisseur catalytique produisant du NO2 et un filtre à particules. Pour éliminer des particules dans le gaz d'échappement d'un moteur à combustion interne, notamment d'un moteur diesel, on utilise de préférence un filtre à particules qui noxious components of the exhaust gas of an internal combustion engine, especially a diesel engine, and which has an exhaust gas line in which are mounted one behind the other in the direction of gas flow exhaust an oxidation catalytic converter, a catalytic converter producing NO2 and a particulate filter. To remove particles in the exhaust gas of an internal combustion engine, in particular a diesel engine, a particle filter is preferably used which
est installé dans la conduite de gaz d'échappement. is installed in the exhaust gas line.
Cependant, le filtre à particules se bouche avec le temps de sorte qu'une régénération est nécessaire, ce qui peut s'effectuer par exemple en brûlant les particules sur le filtre. Il faut toutefois à cet effet une température de combustion de 550 C environ qui ne peut pas être atteinte However, the particle filter becomes clogged over time so that regeneration is necessary, which can be done for example by burning the particles on the filter. However, this requires a combustion temperature of around 550 C which cannot be reached
dans des conditions de fonctionnement normales. under normal operating conditions.
Il est donc souhaitable d'avoir une régénération continue du filtre à particules par combustion. Dans un dispositif du type mentionné en introduction, il a déjà été proposé à cet effet de brancher en amont du filtre à particules dans la conduite de gaz d'échappement un convertisseur catalytique à oxydation, cf. par exemple le document EP 0 341 832 B1, qui peut oxyder encore du NO contenu dans le gaz d'échappement en NO2 avec lequel les particules stockées dans le filtre à particules peuvent être oxydées globalement en continu. On peut ainsi diminuer la température de transformation pour les particules à une plage de température au-dessus de 200 C environ. On connaît un tel système sous le nom de système CRT. Un inconvénient de ce système est qu'il faut pour la régénération du filtre à particules de relativement grandes quantités d'oxyde d'azote qui est lui-même un produit nocif et qui est soumis à des limitations légales. Par ailleurs, le convertisseur catalytique produisant du NO2 tend, notamment en présence d'hydrocarbures ou CO dans sa zone de fonctionnement, à laisser se produire une réaction en It is therefore desirable to have a continuous regeneration of the particulate filter by combustion. In a device of the type mentioned in the introduction, it has already been proposed for this purpose to connect upstream of the particle filter in the exhaust gas pipe an oxidation catalytic converter, cf. for example the document EP 0 341 832 B1, which can further oxidize the NO contained in the exhaust gas to NO2 with which the particles stored in the particle filter can be oxidized globally continuously. It is thus possible to decrease the transformation temperature for the particles to a temperature range above about 200 ° C. Such a system is known by the name of CRT system. A disadvantage of this system is that relatively large quantities of nitrogen oxide, which is itself a harmful product and which are subject to legal restrictions, are required for the regeneration of the particulate filter. Furthermore, the catalytic converter producing NO2 tends, in particular in the presence of hydrocarbons or CO in its operating zone, to allow a reaction to take place.
retour du NO2 au NO.return from NO2 to NO.
L'invention a pour objet de proposer un dispositif du type mentionné en introduction dans lequel une réaction en The object of the invention is to propose a device of the type mentioned in the introduction in which a reaction in
retour du NO2 au NO est évitée ou réduite. NO2 to NO return is avoided or reduced.
Ce problème est résolu par un dispositif du type mentionné en introduction et tel que le convertisseur catalytique à oxydation réduit les hydrocarbures et/ou le This problem is solved by a device of the type mentioned in the introduction and such that the catalytic oxidation converter reduces the hydrocarbons and / or the
monoxyde de carbone contenus dans le gaz d'échappement. carbon monoxide contained in the exhaust gas.
Dans le dispositif selon l'invention, un convertisseur catalytique à oxydation est branché en amont du convertisseur catalytique produisant du NO2 (convertisseur catalytique à NO2) de telle sorte que le gaz d'échappement arrive d'abord au convertisseur catalytique à oxydation et ensuite au convertisseur catalytique à NO2, le convertisseur catalytique à oxydation étant un convertisseur catalytique qui réduit les hydrocarbures et/ou le monoxyde de carbone, c'est-à-dire qui oxyde les hydrocarbures et le monoxyde de carbone se trouvant dans le courant de gaz d'échappement en dioxyde de carbone et en eau. Comme la réaction en retour de NO2 en NO est favorisée dans le convertisseur catalytique à NO2 suivant par les hydrocarbures et le monoxyde de carbone qui sont évités ou réduits par le convertisseur catalytique à oxydation branché en amont, cette réaction en retour est maintenant au moins réduite et l'efficacité du convertisseur In the device according to the invention, an oxidation catalytic converter is connected upstream of the catalytic converter producing NO2 (catalytic converter to NO2) so that the exhaust gas arrives first at the catalytic oxidation converter and then at the NO2 catalytic converter, the oxidation catalytic converter being a catalytic converter which reduces hydrocarbons and / or carbon monoxide, i.e. which oxidizes the hydrocarbons and carbon monoxide present in the gas stream d carbon dioxide and water exhaust. As the NO2 to NO feedback reaction is promoted in the next NO2 catalytic converter by hydrocarbons and carbon monoxide which are avoided or reduced by the upstream connected oxidation catalytic converter, this feedback reaction is now at least reduced and the efficiency of the converter
catalytique à NO2 est nettement augmentée. NO2 catalytic is significantly increased.
On utilise en particulier de la zéolite et du platine In particular, zeolite and platinum are used.
comme matériaux de revêtement.as coating materials.
Selon une variante, le convertisseur catalytique à oxydation comporte un monolithe catalyseur avec une concentration de platine d'au moins 50 g/ft3 (lft3 = 0,028 m3) et une dispersion de 30 % (à l'état frais). Les hydrocarbures et/ou le monoxyde de carbone sont ainsi largement éliminés ou au moins réduits de telle sorte que l'efficacité du According to a variant, the catalytic oxidation converter comprises a catalyst monolith with a platinum concentration of at least 50 g / ft3 (lft3 = 0.028 m3) and a dispersion of 30% (in the fresh state). Hydrocarbons and / or carbon monoxide are thus largely eliminated or at least reduced so that the effectiveness of the
convertisseur catalytique à NO2 est nettement augmentée. NO2 catalytic converter is significantly increased.
On décrira ci-après plus en détail l'invention et d'autres avantages qu'elle permet d'atteindre à l'aide de conceptions avantageuses d'un exemple de réalisation et en The invention will be described in more detail below and other advantages which it makes it possible to achieve by means of advantageous designs of an exemplary embodiment and in
référence au dessin annexe.reference to the accompanying drawing.
Le dessin est une représentation schématique d'un dispositif selon l'invention. Le dispositif désigné globalement par 1 comporte une conduite de gaz d'échappement 2 qui s'étend à partir d'un moteur à combustion interne 3, notamment un moteur diesel, et qui est parcourue, lorsque le moteur à combustion interne 3 fonctionne, par du gaz d'échappement dans le sens d'écoulement indiqué par la flèche 4. Dans la conduite de gaz d'échappement 2 sont montés les uns derrière les autres dans le sens d'écoulement 4 un convertisseur catalytique à oxydation 5, un convertisseur catalytique produisant du NO2 6 (convertisseur catalytique à NO2) et un filtre à particules 7. Le convertisseur catalytique à NO2 peut être The drawing is a schematic representation of a device according to the invention. The device generally designated by 1 comprises an exhaust gas pipe 2 which extends from an internal combustion engine 3, in particular a diesel engine, and which is traversed, when the internal combustion engine 3 operates, by exhaust gas in the direction of flow indicated by arrow 4. In the exhaust gas line 2 are mounted one behind the other in the direction of flow 4 an oxidation catalytic converter 5, a catalytic converter producing NO2 6 (catalytic converter to NO2) and a particulate filter 7. The catalytic converter to NO2 can be
un deuxième convertisseur catalytique à oxydation habituel. a second conventional oxidation catalytic converter.
Le convertisseur catalytique à oxydation 5 adsorbe les hydrocarbures et/ou le monoxyde de carbone. Il comporte à cet effet un revêtement. Comme matériau de revêtement, il convient d'utiliser par exemple de la zéolite ou du platine. Le revêtement du premier convertisseur catalytique à oxydation 5 est conçu de telle sorte que la concentration en platine dans le monolithe catalyseur vaut au moins g/ft3 pour une dispersion d'au moins 30 % (à l'état frais). En outre, pour un nombre spatial de 15.000 h- 1 avec un gaz d'échappement qui contient 50 ppm massique (par rapport au propane) d'hydrocarbures et 400 ppm massique de monoxyde de carbone, le convertisseur catalytique à oxydation 5 a une température de démarrage HC de /150/140 C au maximum et une température de démarrage CO de 150/140/130 C au maximum (température de démarrage = The oxidation catalytic converter 5 adsorbs hydrocarbons and / or carbon monoxide. To this end, it has a coating. As the coating material, for example, zeolite or platinum should be used. The coating of the first catalytic oxidation converter 5 is designed such that the concentration of platinum in the catalyst monolith is at least g / ft3 for a dispersion of at least 30% (in the fresh state). In addition, for a spatial number of 15,000 h -1 with an exhaust gas which contains 50 ppm by mass (relative to propane) of hydrocarbons and 400 ppm by mass of carbon monoxide, the catalytic oxidation converter 5 has a temperature HC starting temperature of / 150/140 C maximum and a CO starting temperature of 150/140/130 C maximum (starting temperature =
% de conversion).% conversion).
Lorsque le dispositif 1 fonctionne, le gaz d'échappement s'écoule du moteur à combustion interne à travers la conduite de gaz d'échappement 2. Ce faisant, le convertisseur catalytique à oxydation 5 convertit des hydrocarbures et du monoxyde de carbone. On empêche ou au moins on réduit ainsi une réaction en retour de NO2 en NO dans le convertisseur catalytique à NO2 6. La réaction en retour est en effet favorisée par les hydrocarbures et le monoxyde de carbone. Ceux-ci sont largement éliminés par le convertisseur catalytique à oxydation 5 de telle sorte que l'efficacité du convertisseur catalytique à NO2 6 est augmentée. Bien que l'invention ait été particulièrement montrée et décrite en se référant à un mode de réalisation préféré de celle-ci, il sera compris aisément par les personnes expérimentées dans cette technique que des modifications dans la forme et dans des détails peuvent être effectuées When the device 1 is operating, the exhaust gas flows from the internal combustion engine through the exhaust gas line 2. In so doing, the oxidation catalytic converter 5 converts hydrocarbons and carbon monoxide. A feedback reaction from NO2 to NO is thus prevented or at least reduced in the catalytic converter to NO2 6. The feedback reaction is in fact favored by hydrocarbons and carbon monoxide. These are largely removed by the oxidation catalytic converter 5 so that the efficiency of the NO2 catalytic converter 6 is increased. Although the invention has been particularly shown and described with reference to a preferred embodiment thereof, it will be readily understood by those skilled in the art that modifications in form and in detail can be made
sans sortir de l'esprit ni du domaine de l'invention. without departing from the spirit or the field of the invention.
LISTE DES REFERENCESLIST OF REFERENCES
1 Dispositif 2 Conduite de gaz d'échappement 3 Moteur à combustion interne 4 Sens d'écoulement Convertisseur catalytique à oxydation 6 Convertisseur catalytique 7 Filtre à particules 1 Device 2 Exhaust gas line 3 Internal combustion engine 4 Direction of flow Oxidation catalytic converter 6 Catalytic converter 7 Particulate filter
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10036401A DE10036401B4 (en) | 2000-07-26 | 2000-07-26 | Device for reducing the harmful components in the exhaust gas of an internal combustion engine, in particular a diesel internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2812342A1 true FR2812342A1 (en) | 2002-02-01 |
FR2812342B1 FR2812342B1 (en) | 2006-07-14 |
Family
ID=7650284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR0109860A Expired - Fee Related FR2812342B1 (en) | 2000-07-26 | 2001-07-24 | DEVICE FOR REDUCING HARMFUL COMPONENTS IN THE EXHAUST GAS OF AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR A DIESEL ENGINE |
Country Status (2)
Country | Link |
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DE (1) | DE10036401B4 (en) |
FR (1) | FR2812342B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10322148B4 (en) * | 2003-05-16 | 2006-11-02 | Umicore Ag & Co. Kg | Emission control system with particle filter and method for its operation with improved regeneration of the particulate filter |
DE102007056202A1 (en) * | 2007-11-22 | 2009-05-28 | Audi Ag | Exhaust after-treatment device for an internal combustion engine and method for the after-treatment of exhaust gases of an internal combustion engine |
JP4507018B2 (en) * | 2008-06-27 | 2010-07-21 | 三菱自動車工業株式会社 | Exhaust gas purification device for internal combustion engine |
DE102010064020B4 (en) | 2010-12-23 | 2013-03-07 | Bosch Emission Systems Gmbh & Co. Kg | Exhaust system and heating method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0341832A2 (en) * | 1988-05-13 | 1989-11-15 | Johnson Matthey Inc. | Treatment of diesel exhaust gas |
EP0758713A1 (en) * | 1995-08-14 | 1997-02-19 | Toyota Jidosha Kabushiki Kaisha | A method for purifying exhaust gas of a diesel engine |
JPH0979024A (en) * | 1995-09-12 | 1997-03-25 | Toyota Motor Corp | Exhaust emission control device for diesel engine |
JPH10121939A (en) * | 1996-10-16 | 1998-05-12 | Toyota Motor Corp | Exhaust emission control device for diesel engine |
EP0976915A2 (en) * | 1998-07-28 | 2000-02-02 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device |
JP2000170526A (en) * | 1998-12-09 | 2000-06-20 | Mitsubishi Motors Corp | Exhaust emission control device for diesel engine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE224507T1 (en) * | 1998-12-05 | 2002-10-15 | Johnson Matthey Plc | IMPROVEMENTS IN EXHAUST PARTICLE CONTROL |
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2000
- 2000-07-26 DE DE10036401A patent/DE10036401B4/en not_active Expired - Fee Related
-
2001
- 2001-07-24 FR FR0109860A patent/FR2812342B1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0341832A2 (en) * | 1988-05-13 | 1989-11-15 | Johnson Matthey Inc. | Treatment of diesel exhaust gas |
EP0341832B1 (en) | 1988-05-13 | 1996-01-10 | Johnson Matthey Inc. | Treatment of diesel exhaust gas |
EP0758713A1 (en) * | 1995-08-14 | 1997-02-19 | Toyota Jidosha Kabushiki Kaisha | A method for purifying exhaust gas of a diesel engine |
JPH0979024A (en) * | 1995-09-12 | 1997-03-25 | Toyota Motor Corp | Exhaust emission control device for diesel engine |
JPH10121939A (en) * | 1996-10-16 | 1998-05-12 | Toyota Motor Corp | Exhaust emission control device for diesel engine |
EP0976915A2 (en) * | 1998-07-28 | 2000-02-02 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device |
JP2000170526A (en) * | 1998-12-09 | 2000-06-20 | Mitsubishi Motors Corp | Exhaust emission control device for diesel engine |
Non-Patent Citations (1)
Title |
---|
BUNTING A: "SPRINGING THE TRAP", AUTOMOTIVE ENGINEER, MECHANICAL ENGINEERING PUBL.LTD. BURY ST.EDMUNDS, GB, vol. 25, no. 5, May 2000 (2000-05-01), pages 73 - 74, XP000936087, ISSN: 0307-6490 * |
Also Published As
Publication number | Publication date |
---|---|
DE10036401A1 (en) | 2002-02-07 |
DE10036401B4 (en) | 2009-07-30 |
FR2812342B1 (en) | 2006-07-14 |
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