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EP0412019A1 - Device for the elimination of carbon particles in exhaust gas from internal combustion engines - Google Patents

Device for the elimination of carbon particles in exhaust gas from internal combustion engines Download PDF

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Publication number
EP0412019A1
EP0412019A1 EP90402232A EP90402232A EP0412019A1 EP 0412019 A1 EP0412019 A1 EP 0412019A1 EP 90402232 A EP90402232 A EP 90402232A EP 90402232 A EP90402232 A EP 90402232A EP 0412019 A1 EP0412019 A1 EP 0412019A1
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EP
European Patent Office
Prior art keywords
filter
coupling member
guides
gases
main guide
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
EP90402232A
Other languages
German (de)
French (fr)
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EP0412019B1 (en
Inventor
Christian Bert
André-Jean Berteaud
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.)
Renault SA
Regie Nationale des Usines Renault
Original Assignee
Renault SA
Regie Nationale des Usines Renault
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Publication of EP0412019A1 publication Critical patent/EP0412019A1/en
Application granted granted Critical
Publication of EP0412019B1 publication Critical patent/EP0412019B1/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides
    • 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
    • F01N3/027—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 electric or magnetic heating means
    • F01N3/028—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 electric or magnetic heating means using microwaves
    • 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
    • F01N3/031—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 having means for by-passing filters, e.g. when clogged or during cold engine start
    • F01N3/032—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 having means for by-passing filters, e.g. when clogged or during cold engine start during filter regeneration only
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/701—Feed lines using microwave applicators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/705—Feed lines using microwave tuning

Definitions

  • the present invention relates to a device for removing carbonaceous particles contained in the exhaust gases of heat engines, consisting of a filtration element constituted by an envelope channeling the gases and containing a filter and providing a cavity which receives micro -waves from a microwave generator.
  • Patent FR-A 2 588 610 proposes two solutions for obtaining the combustion of carbonaceous particles either by passing them, or by making them stay in the areas of the resonator where the electromagnetic field is maximum.
  • the object of the present invention is to provide a device for eliminating particles of the type described above and whose waveguiding system allows optimization of the energy transfer.
  • the device according to the invention is characterized in that the generator is coupled to the filtration element by a tubular coupling member, opening out through a coupling iris in the envelope.
  • the device comprises two filtration elements in parallel and the coupling member whose shape is that of a T consists of a main guide and derived guides connected to the casings of the filtration elements, these guides being metallic and of rectangular sections.
  • the microwaves penetrate into the envelopes by coupling irises which have isolation elements.
  • the coupling member has from 1 to 3 matching pistons.
  • the filtration element 3 consists of an external envelope 31 channeling the gases. It is connected upstream to the pipe 22 and downstream to the pipe 52 and it contains a monolith filter 34.
  • the filter element 4 is similarly composed of an outer casing 41 channeling the gases. It is connected upstream to the pipe 23 and downstream to the pipe 53 and it contains a monolith filter 44.
  • Filters 34 and 44 are filters known per se, ceramic, honeycomb structure and optionally supporting catalysts.
  • Each outer casing 31 and 41 is of cylindrical or elliptical section.
  • the monolith filter 34 or 44 is thermally insulated at its periphery. Its diameter can be substantially equal to that of the envelope and its length adapted to form inside the envelope two cavities, one 35 or 45 upstream, the other 36 or 46 downstream .
  • Microwaves are sent to the upstream cavities 35 and 45.
  • the device comprises a microwave generator 6 associated with a coupling member 7 of general T shape supplying the cavities 35 and 45 with microwaves.
  • the coupling member 7 consists of a main guide 71 and derived guides 72 and 73 having a tubular shape and a rectangular section. It allows the propagation of the only fundamental mode at 2.45 GHz note TE01.
  • the dimensions of the main guide section are marked a and b. As an indication, these dimensions are 86 x 43 mm.
  • the axis of this main guide is parallel to the axes of gas flow in the filters. An equivalent assembly could not easily be carried out with the main guide perpendicular to the axes of circulation of the gases. We would then be with a bend called "Plan H" while the example chosen implements a bend called "Plan E".
  • the main guide 71 is associated with 1, 2 or 3 tuning pistons (2 in the example chosen) which can sink more or less into the guide 71 perpendicularly to the axis thereof. These pistons provide variable susceptances. As an indication, the distance between the pistons is advantageously chosen in the vicinity of ⁇ g / 4 or 3 ⁇ g / 8 where ⁇ g is the guided wavelength.
  • the main guide 71 is connected to two derivative guides 72 and 73 of tubular shape and of rectangular section. These two guides are coaxial and extend perpendicular to the axes of circulation of the gases in the elements 3 and 4.
  • the short side b ′ of the section of the lateral guides 72, 73 is approximately equal to half of the short side b of the main guide 71.
  • the long sides with sections 71, 72, 73 are equal.
  • junction of the derived guides with the main guide can also be carried out using bent waveguides if care is taken to maintain the shapes and dimensions of the straight section during the curvature, the value of the radius of curvature being, moreover, less critical for obtaining good performance.
  • the lateral guides 72 and 73 open into the envelopes 31 and 41 at the level of the cavities 35 and 45 (delimited by the ceramic filters) by coupling irises 37 and 47 respectively. These irises are orifices of smaller section than that of the derived guides. The shape and dimensions of these irises are chosen so as to transfer the most microwave energy into the resonator charged by the filter.
  • the coupling irises 37 and 47 have isolation elements 38 and 48 which allow propagation without attenuation of the microwaves, but prevent the passage of carbonaceous particles towards the derived guides.
  • These elements 38 and 48 are, for example, ceramic plates or discs.
  • a controlled switching valve 24 directs the exhaust gases to one or other of the filters 34 or 44 subjected to the microwaves. In this way, one filter becomes charged with particles while the other filter is in the phase of microwave elimination of the particles.
  • a valve system is advantageously provided in the coupling member 7. It makes it possible to send all of the microwave power to the filtering element in regeneration by obstructing the lateral guide relating to the other filtering element.
  • This constructive arrangement is not limitative of the fact that it is possible to temporarily divert the exhaust gases through a bypass duct without a filter by cleaning a single main filter as described above.
  • the device which has just been described has the following advantages: - It is simple, therefore inexpensive to manufacture. It can be made of sheet metal without any particular tolerance on the dimensions, - Optimization of the energy transfer to the resonators can be done simply by adjusting the depression of the tuning pistons. With the dimensions recommended for the system, an almost total energy transfer can be obtained by specific positions of the pistons, which minimizes the microwave power required for regeneration and therefore the weight of the generator supply (tube magnetron).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

Dispositif d'élimination des particules carbonées contenues dans les gaz d'échappement de moteurs thermiques, constitué par un élément de filtration (3 ou 4) constitué par une enveloppe canalisant les gaz et contenant un filtre (34 ou 44) et ménageant une cavité qui reçoit des micro-ondes d'un générateur de micro-ondes (6), caractérisé par le fait que le générateur (6) est couplé à l'élément de filtration par un organe de couplage ((7) tubulaire, débouchant par un iris de couplage (37 ou 47) dans l'enveloppe.Device for eliminating carbonaceous particles contained in the exhaust gases of heat engines, consisting of a filtration element (3 or 4) constituted by an envelope channeling the gases and containing a filter (34 or 44) and providing a cavity which receives microwaves from a microwave generator (6), characterized in that the generator (6) is coupled to the filter element by a tubular coupling member ((7), opening through an iris coupling (37 or 47) in the envelope.

Description

La présente invention se rapporte à un dispositif d'élimination des particules carbonées contenues dans les gaz d'échappement des moteurs thermiques, constitué par un élément de filtration constitué par une enveloppe canalisant les gaz et contenant un filtre et ménageant une cavité qui reçoit des micro-ondes à partir d'un générateur de micro-ondes.The present invention relates to a device for removing carbonaceous particles contained in the exhaust gases of heat engines, consisting of a filtration element constituted by an envelope channeling the gases and containing a filter and providing a cavity which receives micro -waves from a microwave generator.

On a proposé d'éliminer les particules carbonées contenues dans les gaz d'échappement d'un moteur Diesel par un élément de filtration monté sur un conduit des gaz d'échappement, contenant un filtre à particules et asssocié à un générateur à micro-ondes générant, par l'intermédiaire d'un conducteur d'ondes, les ondes à une cavité formée dans ledit élément.It has been proposed to eliminate the carbonaceous particles contained in the exhaust gases of a diesel engine by a filtration element mounted on an exhaust gas conduit, containing a particle filter and associated with a microwave generator. generating, by means of a wave conductor, the waves to a cavity formed in said element.

La combustion des particules carbonées déposées sur un filtre céramique est rendue possible par l'action d'un champ électromagnétique micro-ondes dans des conditions de mise en oeuvre bien précises.The combustion of carbonaceous particles deposited on a ceramic filter is made possible by the action of a microwave electromagnetic field under very precise operating conditions.

Le brevet FR-A 2 588 610 propose deux solutions pour obtenir la combustion des particules carbonées soit en les faisant passer, soit en les faisant séjourner dans les zones du résonateur où le champ électromagnétique est maximum.Patent FR-A 2 588 610 proposes two solutions for obtaining the combustion of carbonaceous particles either by passing them, or by making them stay in the areas of the resonator where the electromagnetic field is maximum.

La présente invention a pour but de fournir un dispositif d'élimination des particules du type décrit précédemment et dont le système de guidage d'ondes permet une optimisation du transfert d'énergie.The object of the present invention is to provide a device for eliminating particles of the type described above and whose waveguiding system allows optimization of the energy transfer.

Le dispositif, selon l'invention, est caractérisé par le fait que le générateur est couplé à l'élément de filtration par un organe de couplage tubulaire, débouchant par un iris de couplage dans l'enveloppe.The device according to the invention is characterized in that the generator is coupled to the filtration element by a tubular coupling member, opening out through a coupling iris in the envelope.

Selon une caractéristique, le dispositif comporte deux éléments de filtration en parallèle et l'organe de couplage dont la forme est celle d'un T se compose d'un guide principal et de guides dérivés raccordés aux enveloppes des éléments de filtration, ces guides étant métalliques et de sections rectangulaires.According to one characteristic, the device comprises two filtration elements in parallel and the coupling member whose shape is that of a T consists of a main guide and derived guides connected to the casings of the filtration elements, these guides being metallic and of rectangular sections.

Selon une caractéristique, les micro-ondes pénètrent dans les enveloppes par des iris de couplage qui présentent des éléments d'isolement.According to one characteristic, the microwaves penetrate into the envelopes by coupling irises which have isolation elements.

Selon une caractéristique, l'organe de couplage présente de 1 à 3 pistons d'accord.According to one characteristic, the coupling member has from 1 to 3 matching pistons.

L'invention va maintenant être décrite avec plus de détail en se référant à un mode de réalisation donné à titre d'exemple et représenté par les dessins annexés sur lesquels :

  • - la figure 1 est un mode de réalisation du dispositif selon l'invention,
  • - les figures 2 et 3 représentent un composant du dispositif en élévation et en vue de droite.
The invention will now be described in more detail with reference to an embodiment given by way of example and represented by the appended drawings in which:
  • FIG. 1 is an embodiment of the device according to the invention,
  • - Figures 2 and 3 show a component of the device in elevation and in right view.

En se référant à la figure 1, on voit un moteur 1 dont le tuyau des gaz d'échappement 21 se divise en deux branches 22 et 23 sur lesquelles sont montées deux éléments de filtration 3 et 4 fonctionnant en parallèle. Les gaz sortant des éléments 3 et 4 sont canalisés par des tuyaux 52 et 53 qui se raccordent à un tuyau 51. Le sens de circulation des gaz est figuré par des flèches.Referring to Figure 1, we see an engine 1 whose exhaust gas pipe 21 is divided into two branches 22 and 23 on which are mounted two filtration elements 3 and 4 operating in parallel. The gases leaving the elements 3 and 4 are channeled by pipes 52 and 53 which are connected to a pipe 51. The direction of circulation of the gases is shown by arrows.

L'élément de filtration 3 se compose d'une enveloppe externe 31 canalisant les gaz. Elle est raccordée en amont à la tuyauterie 22 et en aval à la tuyauterie 52 et elle contient un filtre monolithe 34.The filtration element 3 consists of an external envelope 31 channeling the gases. It is connected upstream to the pipe 22 and downstream to the pipe 52 and it contains a monolith filter 34.

L'élément de filtration 4 se compose de manière similaire d'une enveloppe externe 41 canalisant les gaz. Elle est raccordée en amont à la tuyauterie 23 et en aval à la tuyauterie 53 et elle contient un filtre monolithe 44.The filter element 4 is similarly composed of an outer casing 41 channeling the gases. It is connected upstream to the pipe 23 and downstream to the pipe 53 and it contains a monolith filter 44.

Les filtres 34 et 44 sont des filtres connus en soi, en céramique, à structure en nid d'abeille et supportant éventuellement des catalyseurs.Filters 34 and 44 are filters known per se, ceramic, honeycomb structure and optionally supporting catalysts.

Chaque enveloppe externe 31 et 41 est de section cylindrique ou elliptique. Le filtre monolithe 34 ou 44 est isolé thermiquement à sa périphérie. Son diamètre peut être sensiblement égal à celui de l'enveloppe et sa longueur adaptée pour former à l'intérieur de l'enveloppe deux cavités, l'une 35 ou 45 vers l'amont, l'autre 36 ou 46 vers l'aval.Each outer casing 31 and 41 is of cylindrical or elliptical section. The monolith filter 34 or 44 is thermally insulated at its periphery. Its diameter can be substantially equal to that of the envelope and its length adapted to form inside the envelope two cavities, one 35 or 45 upstream, the other 36 or 46 downstream .

Des micro-ondes sont envoyées vers les cavités amont 35 et 45.Microwaves are sent to the upstream cavities 35 and 45.

Le dispositif comprend un générateur de micro-ondes 6 associé à un organe de couplage 7 de forme générale en T alimentant en micro-ondes les cavités 35 et 45.The device comprises a microwave generator 6 associated with a coupling member 7 of general T shape supplying the cavities 35 and 45 with microwaves.

L'organe de couplage 7 se compose d'un guide principal 71 et de guides dérivés 72 et 73 ayant une forme tubulaire et une section rectangulaire. Il permet la propagation du seul mode fondamental à 2,45 GHz note TE₀₁. Les dimensions de la section du guide principal sont repérées a et b. A titre indicatif, ces dimensions sont de 86 x 43 mm. L'axe de ce guide principal est parallèle aux axes de circulation des gaz dans les filtres. On saurait réaliser aisément un montage équivalent avec le guide principal perpendiculaire aux axes de circulation des gaz. On se trouverait alors avec un coude dit "Plan H" alors que l'exemple choisi met en oeuvre un coude dit "Plan E".The coupling member 7 consists of a main guide 71 and derived guides 72 and 73 having a tubular shape and a rectangular section. It allows the propagation of the only fundamental mode at 2.45 GHz note TE₀₁. The dimensions of the main guide section are marked a and b. As an indication, these dimensions are 86 x 43 mm. The axis of this main guide is parallel to the axes of gas flow in the filters. An equivalent assembly could not easily be carried out with the main guide perpendicular to the axes of circulation of the gases. We would then be with a bend called "Plan H" while the example chosen implements a bend called "Plan E".

Le guide principal 71 est associé à 1, 2 ou 3 pistons d'accord (2 dans l'exemple choisi) qui peuvent s'enfoncer plus ou moins dans le guide 71 perpendiculairement à l'axe de celui-ci. Ces pistons procurent des susceptances variables. A titre indicatif, la distance entre les pistons est avantageusement choisie au voisinage de λg/4 ou de 3λg/8 ou λg est la longueur d'onde guidée.The main guide 71 is associated with 1, 2 or 3 tuning pistons (2 in the example chosen) which can sink more or less into the guide 71 perpendicularly to the axis thereof. These pistons provide variable susceptances. As an indication, the distance between the pistons is advantageously chosen in the vicinity of λg / 4 or 3λg / 8 where λg is the guided wavelength.

Le guide principal 71 est raccordé à deux guides dérivés 72 et 73 de forme tubulaire et à section rectangulaire. Ces deux guides sont coaxiaux et s'étendent perpendiculairement aux axes de circulation des gaz dans les éléments 3 et 4. Le petit côté b′ de la section des guides latéraux 72, 73 est approximativement égal à la moitié du petit côté b du guide principal 71. Les grands côtés a des sections 71, 72, 73 sont égaux.The main guide 71 is connected to two derivative guides 72 and 73 of tubular shape and of rectangular section. These two guides are coaxial and extend perpendicular to the axes of circulation of the gases in the elements 3 and 4. The short side b ′ of the section of the lateral guides 72, 73 is approximately equal to half of the short side b of the main guide 71. The long sides with sections 71, 72, 73 are equal.

La paroi au niveau de la jonction du guide principal et des guides dérivés présente une forme divergente 76. Cette paroi laisse un passage de largeur b′ = b/2.The wall at the junction of the main guide and the derived guides has a divergent shape 76. This wall leaves a passage of width b ′ = b / 2.

La jonction des guides dérivés avec le guide principal peut être également réalisée à partir de guide d'onde coudés si l'on prend soin de maintenir les formes et les dimensions de la section droite pendant la courbure, la valeur du rayon de courbure étant, par ailleurs, moins critique pour l'obtention de bonnes performances.The junction of the derived guides with the main guide can also be carried out using bent waveguides if care is taken to maintain the shapes and dimensions of the straight section during the curvature, the value of the radius of curvature being, moreover, less critical for obtaining good performance.

Les guides latéraux 72 et 73 débouchent dans les enveloppes 31 et 41 au niveau des cavités 35 et 45 (délimitées par les filtres céramiques) par des iris de couplages 37 et 47 respectivement. Ces iris sont des orifices de section plus faible que celle des guides dérivés. La forme et les dimensions de ces iris sont choisies de manière à transférer le plus d'énergie de micro-ondes dans le résonateur chargé par le filtre.The lateral guides 72 and 73 open into the envelopes 31 and 41 at the level of the cavities 35 and 45 (delimited by the ceramic filters) by coupling irises 37 and 47 respectively. These irises are orifices of smaller section than that of the derived guides. The shape and dimensions of these irises are chosen so as to transfer the most microwave energy into the resonator charged by the filter.

Dans le cas d'un filtre chargé au carbone, on a observé qu'un transfert d'énergie très efficace est obtenu pour un iris rectangulaire dont le petit côté b′ du rectangle est égal à b/2 et dont le grand côté est ajusté précisément au banc de mesure pour minimiser la fraction de puissance réfléchie. Un valeur voisine de 48 mm (≃ a/2) fournit de bons résultats pour le monolithe et la cavité cités en exemple.In the case of a carbon loaded filter, it has been observed that a very efficient energy transfer is obtained for a rectangular iris whose short side b ′ of the rectangle is equal to b / 2 and whose long side is adjusted precisely on the measurement bench to minimize the fraction of reflected power. A value close to 48 mm (≃ a / 2) provides good results for the monolith and the cavity cited as an example.

Les iris de couplage 37 et 47 présentent des éléments d'isolement 38 et 48 qui permettent la propagation sans atténuation des micro-ondes, mais empêchent le passage des particules carbonées vers les guides dérivés. Ces éléments 38 et 48 sont, par exemple, des plaquettes ou disques en céramique.The coupling irises 37 and 47 have isolation elements 38 and 48 which allow propagation without attenuation of the microwaves, but prevent the passage of carbonaceous particles towards the derived guides. These elements 38 and 48 are, for example, ceramic plates or discs.

Un clapet de commutation 24 commandé dirige les gaz d'échappement vers l'un ou l'autre des filtres 34 ou 44 soumis aux micro-ondes. De cette manière, un filtre se charge de particules tandis que l'autre filtre est en phase d'élimination par micro-ondes des particules.A controlled switching valve 24 directs the exhaust gases to one or other of the filters 34 or 44 subjected to the microwaves. In this way, one filter becomes charged with particles while the other filter is in the phase of microwave elimination of the particles.

Un système de clapets est avantageusement prévu dans l'organe de couplage 7. Il permet d'envoyer la totalité de la puissance micro-ondes vers l'élément filtrant en régénération en obstruant le guide latéral concernant l'autre élément filtrant.A valve system is advantageously provided in the coupling member 7. It makes it possible to send all of the microwave power to the filtering element in regeneration by obstructing the lateral guide relating to the other filtering element.

Cette disposition constructive n'est pas limitative du fait que l'on pourra dériver temporairement les gaz d'échappement au travers d'un conduit by-pass sans filtre en procédant au nettoyage d'un filtre principal unique tel que décrit précédemment.This constructive arrangement is not limitative of the fact that it is possible to temporarily divert the exhaust gases through a bypass duct without a filter by cleaning a single main filter as described above.

Le dispositif qui vient d'être décrit possède les avantages suivants :
- Il est simple, donc peu onéreux à fabriquer. Il peut être réalisé en tôle sans tolérance particulière sur les cotes,
- L'optimisation du transfert d'énergie vers les résonateurs peut se faire simplement par réglage de l'enfoncement des pistons d'accord. Avec les dimensions recommandées pour le système, on peut obtenir un transfert d'énergie presque total par des positions spécifiques des pistons, ce qui permet de minimiser la puissance micro-ondes nécessaire à la régénération donc le poids de l'alimentation du générateur (tube magnétron).The device which has just been described has the following advantages:
- It is simple, therefore inexpensive to manufacture. It can be made of sheet metal without any particular tolerance on the dimensions,
- Optimization of the energy transfer to the resonators can be done simply by adjusting the depression of the tuning pistons. With the dimensions recommended for the system, an almost total energy transfer can be obtained by specific positions of the pistons, which minimizes the microwave power required for regeneration and therefore the weight of the generator supply (tube magnetron).

Claims (9)

1°) Dispositif d'élimination des particules carbonées contenues dans les gaz d'échappement de moteurs thermiques, constitué par un élément de filtration (3 ou 4) constitué par une enveloppe canalisant les gaz et contenant un filtre (34 ou 44) et ménageant une cavité qui reçoit des micro-ondes d'un générateur de micro-ondes (6), caractérisé par le fait que le générateur (6) est couplé à l'élément de filtration par un organe de couplage (7) tubulaire, débouchant par un iris de couplage (37 ou 47) dans l'enveloppe. 1) Device for eliminating carbonaceous particles contained in the exhaust gases of heat engines, consisting of a filtration element (3 or 4) constituted by an envelope channeling the gases and containing a filter (34 or 44) and providing a cavity which receives microwaves from a microwave generator (6), characterized in that the generator (6) is coupled to the filter element by a tubular coupling member (7), opening out through a coupling iris (37 or 47) in the envelope. 2°) Dispositif selon la revendication 1, caractérisé par le fait qu'il comporte deux éléments de filtration (3 et 4) en parallèle et que l'organe de couplage (7) dont la forme est celle d'un T se compose d'un guide principal (71) et de guides dérivés (72, 73) raccordés aux enveloppes des éléments de filtration, ces guides étant métalliques et de sections rectangulaires. 2 °) Device according to claim 1, characterized in that it comprises two filtration elements (3 and 4) in parallel and that the coupling member (7) whose shape is that of a T consists of 'a main guide (71) and derived guides (72, 73) connected to the envelopes of the filter elements, these guides being metallic and of rectangular sections. 3°) Dispositif selon la revendication 2, caractérisé par le fait que la paroi de l'organe de couplage présente à la jonction du guide principal et des guides dérivés une forme divergente (76). 3 °) Device according to claim 2, characterized in that the wall of the coupling member has at the junction of the main guide and the derived guides a divergent shape (76). 4°) Dispositif selon la revendication 3, caractérisé par le fait que la jonction du guide principal avec les guides latéraux peut être réalisée à l'aide de guides d'onde coudés. 4 °) Device according to claim 3, characterized in that the junction of the main guide with the lateral guides can be achieved using bent waveguides. 5°) Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que les micro-ondes pénètrent dans les enveloppes (31, 41) par des iris de couplage (37, 47) qui présentent des éléments d'isolement (38, 48). 5 °) Device according to any one of the preceding claims, characterized in that the microwaves penetrate into the envelopes (31, 41) by coupling irises (37, 47) which have insulating elements (38 , 48). 6°) Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que l'organe de couplage (7) présente de 1 à 3 pistons d'accord (74, 75). 6 °) Device according to any one of the preceding claims, characterized in that the coupling member (7) has from 1 to 3 matching pistons (74, 75). 7°) Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que le filtre est à base de matériau réfractaire à faibles pertes diélectriques. 7 °) Device according to any one of the preceding claims, characterized in that the filter is based on refractory material with low dielectric losses. 8°) Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait qu'un clapet de commutation (24) dirige les gaz vers l'un ou l'autre des filtres (34, 44) dans le but d'avoir toujours un filtre qui se charge de particules et au moins un autre filtre en phase d'élimination par micro-ondes de particules. 8 °) Device according to any one of the preceding claims, characterized in that a switching valve (24) directs the gases towards one or the other of the filters (34, 44) in order to have always a particle-laden filter and at least one other filter in the microwave particle removal phase. 9°) Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait qu'un système de clapets, disposé dans l'organe de couplage (7) permet d'envoyer la totalité de la puissance micro-ondes vers l'élément filtrant en régénération. 9 °) Device according to any one of the preceding claims, characterized in that a system of valves, arranged in the coupling member (7) makes it possible to send all of the microwave power to the element filtering during regeneration.
EP19900402232 1989-08-04 1990-08-03 Device for the elimination of carbon particles in exhaust gas from internal combustion engines Expired - Lifetime EP0412019B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8910569A FR2650627B1 (en) 1989-08-04 1989-08-04 DEVICE FOR REMOVING CARBON PARTICLES CONTAINED IN EXHAUST GASES OF HEAT ENGINES
FR8910569 1989-08-04

Publications (2)

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EP0412019A1 true EP0412019A1 (en) 1991-02-06
EP0412019B1 EP0412019B1 (en) 1995-04-19

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EP (1) EP0412019B1 (en)
DE (1) DE69018727T2 (en)
ES (1) ES2071056T3 (en)
FR (1) FR2650627B1 (en)

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WO1993012629A1 (en) * 1991-12-13 1993-06-24 Staffordshire University Enterprises Limited Microwave heating method and apparatus
FR2701514A1 (en) * 1993-02-12 1994-08-19 Renault Method for purifying exhaust gases of internal combustion engines using microwaves, and implementation device
EP1541819A1 (en) * 2003-12-12 2005-06-15 Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO Microwave regenerated diesel particulate trap
CN105179049A (en) * 2015-09-18 2015-12-23 浙江大学 Double-cavity type diesel engine exhaust particle capturing device based on microwave heating regeneration technology
WO2022168116A1 (en) * 2021-02-02 2022-08-11 Chakr Innovation Private Limited System and method for microwave based intermittent regeneration for particulate filter(s) of diesel engine
US11578630B2 (en) 2017-12-28 2023-02-14 Arcs Energy Limited Fluid treatment apparatus for an exhaust system and method thereof

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE102006044893B4 (en) * 2006-09-22 2011-06-30 GM Global Technology Operations LLC, ( n. d. Ges. d. Staates Delaware ), Mich. Microwave regeneration control system for a diesel particulate filter

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993012629A1 (en) * 1991-12-13 1993-06-24 Staffordshire University Enterprises Limited Microwave heating method and apparatus
FR2701514A1 (en) * 1993-02-12 1994-08-19 Renault Method for purifying exhaust gases of internal combustion engines using microwaves, and implementation device
EP1541819A1 (en) * 2003-12-12 2005-06-15 Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO Microwave regenerated diesel particulate trap
WO2005056989A1 (en) * 2003-12-12 2005-06-23 Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno Self-burncleaning sootfilter for a combustion engine
CN105179049A (en) * 2015-09-18 2015-12-23 浙江大学 Double-cavity type diesel engine exhaust particle capturing device based on microwave heating regeneration technology
US11578630B2 (en) 2017-12-28 2023-02-14 Arcs Energy Limited Fluid treatment apparatus for an exhaust system and method thereof
WO2022168116A1 (en) * 2021-02-02 2022-08-11 Chakr Innovation Private Limited System and method for microwave based intermittent regeneration for particulate filter(s) of diesel engine

Also Published As

Publication number Publication date
DE69018727D1 (en) 1995-05-24
EP0412019B1 (en) 1995-04-19
ES2071056T3 (en) 1995-06-16
DE69018727T2 (en) 1995-11-23
FR2650627B1 (en) 1994-09-16
FR2650627A1 (en) 1991-02-08

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