FR2719628A1 - Radial flow catalytic exhaust pipe for vehicle - Google Patents

Radial flow catalytic exhaust pipe for vehicle Download PDF

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Publication number
FR2719628A1
FR2719628A1 FR9405684A FR9405684A FR2719628A1 FR 2719628 A1 FR2719628 A1 FR 2719628A1 FR 9405684 A FR9405684 A FR 9405684A FR 9405684 A FR9405684 A FR 9405684A FR 2719628 A1 FR2719628 A1 FR 2719628A1
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FR
France
Prior art keywords
inlet
exhaust pipe
longitudinal axis
catalytic exhaust
gases
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
FR9405684A
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French (fr)
Other versions
FR2719628B1 (en
Inventor
Favennec Jean
Labosse Marc
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.)
CINTRAX, FR
Original Assignee
ROSI ETS
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 ROSI ETS filed Critical ROSI ETS
Priority to FR9405684A priority Critical patent/FR2719628B1/en
Publication of FR2719628A1 publication Critical patent/FR2719628A1/en
Application granted granted Critical
Publication of FR2719628B1 publication Critical patent/FR2719628B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N13/011—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 purifying devices arranged in parallel
    • F01N13/017—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 purifying devices arranged in parallel the purifying devices are arranged in a single housing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The exhaust pipe comprises a central hollow volume (1) constituting a treatment chamber with an inlet pipe (2) on its front part and outlet pipe (3) on its rear part. The inlet and outlet pipes are both located on the longitudinal axis (4) corresponding to the exhaust pipe line.The treatment chamber has the shape of a thin rectangle containing a central portion (5) whose front end opens onto the inlet section. Its bottom is closed. The side faces of the central portion are formed by the inlet faces (61,71) of two metallic supports (6,7) made of waffle-iron sheets which constitute the exhaust pipe catalytic element. These elements are located symmetrically either side the longitudinal axis, their inlet faces making an angle between 7 and 20 deg with the axis.

Description

POT D'ECHAPPEMENT CATALYTIQUE
A ECOULEMENT RADIAL
La présente invention concerne un pot d'échappement catalytique à écoulement radial.CATALYTIC EXHAUST
RADIAL FLOW
The present invention relates to a catalytic exhaust with radial flow.

Les pots catalytiques sont connus depuis plusieurs dizaines d'années. Toutefois, le coût de fabrication élevé de ces pots constitue un obstacle à leur développement pour les grandes séries automobiles. Afin de réduire ce coût, imputable notamment à la quantité de métaux précieux utilisée, on cherche donc à réduire le volume du pot ; cela permet en même temps d'en diminuer l'encombrement, ce qui remédie aux problèmes de garde au sol. On cherche également à réduire les pertes de charge dans le tuyau d'échappement. Catalytic converters have been known for several decades. However, the high manufacturing cost of these pots constitutes an obstacle to their development for large automobile series. In order to reduce this cost, attributable in particular to the quantity of precious metals used, we therefore seek to reduce the volume of the pot; this at the same time reduces its size, which overcomes the problems of ground clearance. It is also sought to reduce the pressure losses in the exhaust pipe.

Le document FR-A-1 412 392 décrit un appareil pour la combustion catalytique des gaz, notamment des gaz d'échappement. Dans un mode de réalisation représenté par la figure 3 de ce document, les gaz arrivent dans une chambre d'admission, puis l'écoulement se divise de part et d'autre de l'axe de symétrie du pot pour pénétrer dans deux éléments catalytiques disposés parallèlement au flux de gaz ; les gaz s'échappent ensuite dans l'atmosphère après passage dans deux sections d'évacuation disposées de part et d'autre de faces de sortie des éléments catalytiques. Document FR-A-1 412 392 describes an apparatus for the catalytic combustion of gases, in particular exhaust gases. In an embodiment represented by FIG. 3 of this document, the gases arrive in an intake chamber, then the flow divides on either side of the axis of symmetry of the pot to penetrate into two catalytic elements arranged parallel to the gas flow; the gases then escape into the atmosphere after passing through two discharge sections arranged on either side of the outlet faces of the catalytic elements.

Cette structure présente un inconvénient : la disposition des faces d'entrée des supports parallèlement au flux de gaz ne favorise pas la distribution des gaz arrivant par la section d'entrée, et n'optimise donc pas les performances de dépollution. En effet, les gaz ont tendance à se diriger vers l'extrémité obstruée de la portion centrale à l'opposé de la section d'entrée, et pénètrent donc massivement dans les supports par l'extré- mité des faces d'entrée de ceux-ci, tandis que seule une faible partie des gaz se répartit sur le reste des faces d'entrée. Cette distribution non homogène des gaz à travers les supports ne permet pas de minimiser les pertes de charge et d'optimiser le rendement du système catalytique. This structure has a drawback: the arrangement of the inlet faces of the supports parallel to the gas flow does not favor the distribution of the gases arriving through the inlet section, and therefore does not optimize the depollution performance. In fact, the gases tend to go towards the obstructed end of the central portion opposite the inlet section, and therefore penetrate massively into the supports by the end of the inlet faces of those -this, while only a small part of the gases is distributed over the rest of the inlet faces. This non-homogeneous distribution of gases through the supports does not make it possible to minimize the pressure drops and to optimize the efficiency of the catalytic system.

La présente invention a pour objectif de proposer un pot d'échappement catalytique économique, présentant une surface frontale aussi grande que possible pour optimiser la répartition des gaz et minimiser ainsi les pertes de charge, et une longueur aussi petite que possible pour minimiser le volume total et donc l'encombrement sous la caisse d'une part, et le coût de fabrication d'autre part. The aim of the present invention is to propose an economical catalytic exhaust system, having a front surface as large as possible to optimize the distribution of gases and thus minimize pressure losses, and a length as small as possible to minimize the total volume. and therefore the space under the body on the one hand, and the manufacturing cost on the other hand.

La présente invention atteint son objectif en proposant un pot d'échappement catalytique, comportant une section d'entrée tubulaire, une section de sortie tubulaire située dans le prolongement de la section d'entrée sur un axe longitudinal correspondant à la ligne d'échappement du pot, et un volume central globalement parallélépipédique plat comprenant deux pains offrant chacun des canaux de passage aux gaz à traiter ; ces canaux seront préférentiellement obtenus par empilage de feuillards graufrés en chevron permettant de générer le meilleur contact entre le gaz et les parois. The present invention achieves its objective by proposing a catalytic exhaust, comprising a tubular inlet section, a tubular outlet section situated in the extension of the inlet section on a longitudinal axis corresponding to the exhaust line of the pot, and a generally parallelepipedal flat central volume comprising two loaves each providing passage channels for the gases to be treated; these channels will preferably be obtained by stacking chevron-embossed strips enabling the best contact between the gas and the walls to be generated.

Les gaz à traiter sont distribués à partir d'une face d'entrée respective sur laquelle arrivent les gaz, lesdits pains étant disposés symétriquement de part et d'autre dudit axe longitudinal, caractérisé en ce que lesdites faces d'entrée forment un angle avec ledit axe longitudinal. Dans un mode de réalisation privilégié de la présente invention, ledit angle est compris entre 7 et 200. Avantageusement, ledit angle est voisin de 15".  The gases to be treated are distributed from a respective inlet face on which the gases arrive, said loaves being arranged symmetrically on either side of said longitudinal axis, characterized in that said inlet faces form an angle with said longitudinal axis. In a preferred embodiment of the present invention, said angle is between 7 and 200. Advantageously, said angle is close to 15 ".

Les avantages et les caractéristiques de la présente invention ressortiront clairement de la description détaillée ci-dessous, faite en référence aux dessins annexés, dans lesquels
- la figure 1 est une vue en perspective d'un mode de réalisation d'un pot d'échappement catalytique à écoulement radial conforme à la présente invention,
- la figure 2 est une vue de dessus du même mode de réalisation d'un pot d'échappement catalytique à écoulement radial conforme à la présente invention.The advantages and characteristics of the present invention will emerge clearly from the detailed description below, given with reference to the accompanying drawings, in which
FIG. 1 is a perspective view of an embodiment of a catalytic exhaust with radial flow in accordance with the present invention,
- Figure 2 is a top view of the same embodiment of a catalytic exhaust with radial flow according to the present invention.

En référence à la figure 1, un pot d'échappement catalytique conforme à la présente invention comprend un volume central creux constituant une chambre de traitement 1 munie d'une section d'entrée tubulaire 2 sur sa partie avant, et d'une section de sortie tubulaire 3 sur sa partie arrière. Les sections d'entrée et de sortie 2 et 3 sont situées sur un axe longitudinal 4 qui correspond à la ligne d'échappement du pot. La chambre de traitement 1 présente avantageusement la forme globale d'un parallélépipède rectangle de faible épaisseur. Elle contient une portion centrale 5 dont l'extrémité avant s'ouvre sur la section d'entrée 2, et dont le fond 51 est fermé. Les faces latérales de la portion centrale 5 sont formées par les faces d'entrée 61 et 71 de deux supports métalliques ou pains 6 et 7, qui constituent l'élément catalytique du pot. Ces pains 6 et 7 sont disposés de part et d'autre de la portion centrale 5, symétriquement par rapport à l'axe longitudinal 4, leurs faces d'entrée 61 et 71 faisant un angle a avec cet axe. Chacun des pains est avantageusement réalisé sous la forme d'un empilement parallélépipédique de feuilles gaufrées offrant des canaux de passage aux gaz à traiter, comme décrit dans le document FR-A-2 656 373. Cependant, toute autre forme d'empilement peut être réalisée. Le choix d'un gaufrage induisant des turbulences dans le support catalytique améliore l'échange entre le gaz et les parois et améliore l'efficacité de conversion, et permet par suite de réduire la profondeur du support, et donc, le volume total. Referring to Figure 1, a catalytic converter according to the present invention comprises a hollow central volume constituting a treatment chamber 1 provided with a tubular inlet section 2 on its front part, and a section of tubular outlet 3 on its rear part. The inlet and outlet sections 2 and 3 are located on a longitudinal axis 4 which corresponds to the exhaust line of the pot. The treatment chamber 1 advantageously has the overall shape of a rectangular parallelepiped of small thickness. It contains a central portion 5, the front end of which opens onto the inlet section 2, and the bottom 51 of which is closed. The lateral faces of the central portion 5 are formed by the inlet faces 61 and 71 of two metal supports or bars 6 and 7, which constitute the catalytic element of the pot. These breads 6 and 7 are arranged on either side of the central portion 5, symmetrically with respect to the longitudinal axis 4, their inlet faces 61 and 71 making an angle a with this axis. Each of the loaves is advantageously produced in the form of a parallelepipedic stack of embossed sheets offering passage channels for the gases to be treated, as described in document FR-A-2 656 373. However, any other form of stacking can be carried out. The choice of an embossing inducing turbulence in the catalytic support improves the exchange between the gas and the walls and improves the conversion efficiency, and consequently makes it possible to reduce the depth of the support, and therefore, the total volume.

En référence à la figure 2, les gaz d'échappement à traiter pénètrent dans le pot par la section d'entrée 2, comme indiqué par la flèche E, puis l'écoulement longitudinal se divise en deux écoulement radiaux dans la portion centrale 5 suivant l'axe longitudinal 4 et pénètre dans les pains 6 et 7 par leurs faces d'entrée respectives 61 et 71, où la conversion des gaz se produit grâce aux multiples canaux de passage revêtus de catalyseur. En raison de l'angle a que les pains 6 et 7 forment avec l'axe 4, les gaz se répartissent de façon sensiblement uniforme sur l'ensemble de leurs faces d'entrée respectives 61 et 71. Ils pénètrent alors dans les canaux de passage formés par l'empilement de feuilles gaufrées, où ils subissent les conversions appropriées. Referring to Figure 2, the exhaust gas to be treated enters the pot through the inlet section 2, as indicated by the arrow E, then the longitudinal flow is divided into two radial flows in the central portion 5 following the longitudinal axis 4 and enters the loaves 6 and 7 through their respective inlet faces 61 and 71, where the gas conversion occurs thanks to the multiple passage channels coated with catalyst. Due to the angle a that the loaves 6 and 7 form with the axis 4, the gases are distributed in a substantially uniform manner over all of their respective inlet faces 61 and 71. They then penetrate into the channels of passage formed by the stack of embossed sheets, where they undergo the appropriate conversions.

Les gaz ressortent ensuite des pains de façon radiale dans les espaces situés entre les faces de sortie des pains et les parois de la chambre de traitement 1 pour se réunir en un écoulement longitudinal et s'échapper par la section de sortie 3 du pot, comme indiqué par la flèche
S. The gases then emerge from the loaves radially in the spaces located between the outlet faces of the loaves and the walls of the treatment chamber 1 to meet in a longitudinal flow and escape through the outlet section 3 of the pot, as indicated by the arrow
S.

Claims (4)

REVENDICATIONS 1. Pot d'échappement catalytique, comportant une section d'entrée tubulaire (2), une section de sortie tubulaire (3) située dans le prolongement de la section d'entrée (2) sur un axe longitudinal (4) correspondant à la ligne d'échappement du pot, et un volume central (1) globalement parallélépipédique plat comprenant deux pains (6) et (7) offrant chacun des canaux de passage aux gaz à traiter distribués à partir d'une face d'entrée respective (61) et (71) sur laquelle arrivent les gaz, lesdits pains (6) et (7) étant disposés symétriquement de part et d'autre dudit axe longitudinal (4), caractérisé en ce que lesdites faces d'entrée (61) et (71) forment un angle (a) avec ledit axe longitudinal (4).1. Catalytic exhaust, comprising a tubular inlet section (2), a tubular outlet section (3) located in the extension of the inlet section (2) on a longitudinal axis (4) corresponding to the exhaust line of the pot, and a central volume (1) generally parallelepiped flat comprising two loaves (6) and (7) each providing passage channels for the gases to be treated distributed from a respective inlet face (61 ) and (71) on which the gases arrive, said loaves (6) and (7) being arranged symmetrically on either side of said longitudinal axis (4), characterized in that said inlet faces (61) and ( 71) form an angle (a) with said longitudinal axis (4). 2. Pot d'échappement catalytique selon la revendication 1, caractérisé en ce que ledit angle (a) est compris entre 7 et 20 . 2. Catalytic exhaust according to claim 1, characterized in that said angle (a) is between 7 and 20. 3. Pot d'échappement catalytique selon la revendication 2, caractérisé en ce que ledit angle (a) est voisin de 15 . 3. Catalytic exhaust according to claim 2, characterized in that said angle (a) is close to 15. 4. Pot d'échappement catalytique selon la revendication 1, caractérisé en ce que lesdits pains (6) et (7) sont obtenus par empilage de feuilles gaufrées. 4. Catalytic exhaust according to claim 1, characterized in that said breads (6) and (7) are obtained by stacking embossed sheets.
FR9405684A 1994-05-09 1994-05-09 Radial flow catalytic exhaust. Expired - Lifetime FR2719628B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9405684A FR2719628B1 (en) 1994-05-09 1994-05-09 Radial flow catalytic exhaust.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9405684A FR2719628B1 (en) 1994-05-09 1994-05-09 Radial flow catalytic exhaust.

Publications (2)

Publication Number Publication Date
FR2719628A1 true FR2719628A1 (en) 1995-11-10
FR2719628B1 FR2719628B1 (en) 1996-07-05

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FR9405684A Expired - Lifetime FR2719628B1 (en) 1994-05-09 1994-05-09 Radial flow catalytic exhaust.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1262643A1 (en) * 2001-05-14 2002-12-04 MAN Nutzfahrzeuge Aktiengesellschaft Vehicle exhaust system with catalysts in an exhaust pipe section
WO2014201485A1 (en) * 2013-06-19 2014-12-24 Ibiden Porzellanfabrik Frauenthal Gmbh Catalytic converter reactor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1412392A (en) * 1964-02-04 1965-10-01 Engelhard Ind Inc Apparatus for the catalytic combustion of gases, in particular exhaust gases
FR2075691A5 (en) * 1970-01-19 1971-10-08 Universal Oil Prod Co
FR2270444A1 (en) * 1974-02-22 1975-12-05 Inst Francais Du Petrole Catalytic exhaust converter for I.C. engine - has annular conical catalyst space with end caps inclined to inlet flow
DE2614692A1 (en) * 1975-04-09 1976-10-14 Babcock Hitachi Kk CATALYZER ACTION DEVICE
EP0419906A1 (en) * 1989-09-12 1991-04-03 W.R. Grace & Co.-Conn. Core element and core for electrically heatable catalytic converter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1412392A (en) * 1964-02-04 1965-10-01 Engelhard Ind Inc Apparatus for the catalytic combustion of gases, in particular exhaust gases
FR2075691A5 (en) * 1970-01-19 1971-10-08 Universal Oil Prod Co
FR2270444A1 (en) * 1974-02-22 1975-12-05 Inst Francais Du Petrole Catalytic exhaust converter for I.C. engine - has annular conical catalyst space with end caps inclined to inlet flow
DE2614692A1 (en) * 1975-04-09 1976-10-14 Babcock Hitachi Kk CATALYZER ACTION DEVICE
EP0419906A1 (en) * 1989-09-12 1991-04-03 W.R. Grace & Co.-Conn. Core element and core for electrically heatable catalytic converter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1262643A1 (en) * 2001-05-14 2002-12-04 MAN Nutzfahrzeuge Aktiengesellschaft Vehicle exhaust system with catalysts in an exhaust pipe section
WO2014201485A1 (en) * 2013-06-19 2014-12-24 Ibiden Porzellanfabrik Frauenthal Gmbh Catalytic converter reactor
AT514512A1 (en) * 2013-06-19 2015-01-15 Ibiden Porzellanfabrik Frauenthal Gmbh catalyst reactor
JP2016529432A (en) * 2013-06-19 2016-09-23 イビデン ポルツェランファブリック フラウエンタール ゲーエムベーハ—Ｉｂｉｄｅｎ Ｐｏｒｚｅｌｌａｎｆａｂｒｉｋ Ｆｒａｕｅｎｔｈａｌ Ｇｍｂｈ Catalytic converter reactor
US10155196B2 (en) 2013-06-19 2018-12-18 Ibiden Porzellanfabrik Frauenthal Gmbh Catalytic converter reactor

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Owner name: CINTRAX, FR

Effective date: 20120404