EP1598595B1 - Arrangement d'évaporateur - Google Patents

Arrangement d'évaporateur Download PDF

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Publication number
EP1598595B1
EP1598595B1 EP20050006431 EP05006431A EP1598595B1 EP 1598595 B1 EP1598595 B1 EP 1598595B1 EP 20050006431 EP20050006431 EP 20050006431 EP 05006431 A EP05006431 A EP 05006431A EP 1598595 B1 EP1598595 B1 EP 1598595B1
Authority
EP
European Patent Office
Prior art keywords
fuel
evaporator medium
porous evaporator
evaporator
porous
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.)
Expired - Fee Related
Application number
EP20050006431
Other languages
German (de)
English (en)
Other versions
EP1598595A1 (fr
Inventor
Walter Blaschke
Karsten Reiners
Herrmann Eppler
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.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
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 J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP1598595A1 publication Critical patent/EP1598595A1/fr
Application granted granted Critical
Publication of EP1598595B1 publication Critical patent/EP1598595B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D3/00—Burners using capillary action
    • F23D3/40—Burners using capillary action the capillary action taking place in one or more rigid porous bodies

Definitions

  • the present invention relates to an evaporator arrangement for delivering a fuel vapor into a mixing chamber according to the preamble of claim 1.
  • Such evaporator arrangements are used for example in fuel-operated heaters for motor vehicles, these heaters can be used in turn as a heater or as a heater.
  • a mixture of fuel vapor and combustion air is generated, which can be ignited and burned to generate heat.
  • reformers to produce in a mixing chamber, a mixture of vaporized fuel, ie vaporized hydrocarbon, and other mixed material, for example, air or water vapor. This mixture is then passed to a catalyst assembly to produce a hydrogen-containing gas mixture by catalytic reaction.
  • the selective introduction of the liquid fuel in the porous evaporator medium continues to run the risk that a very nonuniform fuel distribution by gravity on the one hand and by capillary action on the other hand occurs and thus not the entire surface of the evaporator medium can be used for Brennstoffabdampfung, but for a defined mixture formation may be required.
  • An evaporator arrangement according to the preamble of claim 1 is known from DE 39 14 611 A1 known.
  • a porous disk-like porous evaporator medium is received in a dish-like carrier.
  • a stick glow plug At the back of the cup-like carrier is a stick glow plug which is capable of heating the porous evaporator medium and the liquid fuel contained therein.
  • the DE 101 30 638 A1 discloses an evaporator assembly having a multi-layered porous evaporator medium disposed in a cup-like housing.
  • a plate-like fuel deflector element may be arranged between two layers of the porous evaporator medium, which is the inlet region for the liquid fuel covered.
  • the US-A 5,082,175 discloses an evaporator arrangement in which a porous evaporator medium is arranged in a pot-like housing. Between a arranged at the back of the evaporator medium glow plug and the evaporator medium is a plate-like bottom portion.
  • the EP 1 484 552 A1 discloses an evaporator assembly having a pot-like housing. At a bottom region of the cup-shaped housing is arranged a combustion chamber facing a porous evaporator medium. At the back of the bottom region is an electrically energizable heating device, which can provide a projecting region for ignition conditions in the region of the porous evaporator medium which can be heated by the latter and penetrates the bottom region and the porous evaporator medium.
  • an evaporator arrangement for emitting a fuel vapor into a mixing chamber according to claim 1.
  • This comprises a porous evaporator medium, a liquid fuel leading to the porous evaporator medium line arrangement and a heater on a side facing away from the mixing chamber or facing away from the back of the porous Evaporator medium, wherein between the porous evaporator medium and the heater is arranged a direct contact between these suppressive separating element.
  • a fuel flow guide formation is formed in the porous evaporator medium.
  • Such a fuel flow guide formation comprises compressed regions or recessed regions in the porous evaporator medium, which then have a different capillary flow behavior or locally prevent the occurrence of capillary flow and thus create barriers for the fuel flow.
  • a separator that not only ensures a uniform heat input into the porous evaporator medium, but also ensures that an exit from Fuel vapor at the back of the porous evaporator medium can be prevented as well as the leakage of liquid fuel at the back of the porous evaporator medium.
  • fuels in the context of the present invention generally liquid hydrocarbons, such.
  • Gasoline, diesel, biodiesel and the like are considered, for example, are available for combustion, but nevertheless also be used to be implemented in a reformer for hydrogen production for a fuel cell system.
  • the separating element be formed from a material that conducts heat well, preferably metal.
  • the separating element substantially the entire back of the porous evaporator medium covered. This ensures that practically the entire porous evaporator medium is thermally contacted and that over the entire rear side the escape of fuel or fuel vapor can be prevented.
  • the separating element overlap an outer edge region of the porous evaporator medium.
  • the separating element is designed like a shell and is arranged with a dish bottom at the back of the porous evaporator medium, while the shell edge then overlaps the outer edge region of the porous evaporator medium, i. surrounds this outer edge region or rests there.
  • the separating element may have a fuel introduction opening for the line arrangement.
  • a further improved fuel distribution behavior can be obtained by providing a fuel distribution channel arrangement on the separating element starting from the fuel introduction opening.
  • the line arrangement penetrate through the fuel introduction opening and be held under pressure against the porous evaporator medium with a discharge end.
  • the porous evaporator medium has a peripheral contour, which is adapted to a peripheral contour of a mixing chamber, preferably a bottom portion thereof, and that the line arrangement is introduced eccentrically to the porous evaporator medium.
  • the distribution behavior of the fuel in the porous evaporator medium to achieve improved Brennstoffabdampfung can be influenced by the fact that the porous evaporator medium is constructed in multiple layers and the layers at least partially have a different fuel conductivities.
  • the present invention further relates to a vehicle heater comprising an evaporation arrangement according to the invention.
  • the present invention relates to a reformer assembly with an evaporator assembly according to the invention, as mentioned, to produce a mixture of fuel vapor, so hydrocarbon vapor, and air and / or water vapor and / or recirculated combustion or fuel cell exhaust gases.
  • an evaporator assembly is generally designated 10.
  • This evaporator assembly 10 essentially provides a peripheral region 12 and a bottom region 14, which together define a mixing chamber 16.
  • a mixture of, for example, air and a fuel vapor can be generated in this mixing chamber 16.
  • This mixture can be ignited by using a projecting into the mixing chamber 16 ignition element 18 to use the resulting in the then running combustion heat.
  • the heat generated during combustion can be transferred to a medium to be heated, so for example air or water.
  • the heat generated during combustion can be used to preheat the reformer assembly.
  • the combustion is stopped or suppressed in order to be able to convert the mixture of hydrocarbon vapor, air and / or possibly other mixed material constituents into a catalyst arrangement and thereby hydrogen for a fuel cell system to be able to produce.
  • the peripheral region 12 is at the in Fig. 1 shown embodiment provided by a substantially cylindrical peripheral wall member 20 having a plurality of inlet openings 22 for air or other mixed material.
  • a further approximately cylindrical component 24 encompasses an axial end region-axially with respect to a longitudinal center axis of the peripheral wall component 20-of this peripheral wall component 20 and holds with a step-like region 26 a porous evaporator medium 28 configured like a disc here together with a dividing element 30 likewise configured as a disk on the circumferential wall component 20.
  • the porous evaporator medium 28 may, as is well known, braid, knitted fabric, foamed ceramic or the like. which is capable of distributing the liquid fuel or hydrocarbon introduced therein by capillary action.
  • the rear side 32 of the porous evaporator medium 28 here completely overlapping separating element 30 is preferably formed of metal material, such as sheet metal material. It has a nozzle 34 formed by forming, into which a fuel line 36 opens and thus promotes liquid fuel in the region of the porous evaporator medium 28.
  • a heating coil 38 heating device On the side facing away from the porous evaporator medium 28 side of the partition member 30 is a configured in the form of a heating coil 38 heating device is provided, which touches the partition member 30 in the largest possible area and thus contributes to the most uniform heating of the partition member 30.
  • the heating coil 38 is covered on its side facing away from the separating element 30 by insulating material 40, which in turn is covered by an insulating material 40 in a further uniform manner on the entire back side 32 of the porous evaporator medium 28 Holding plate 42 and a locking ring 44 is fixed to the component 24.
  • the heating coil 38 is between the insulating material 40 and the separating element 30 locked in the direction of the longitudinal axis L.
  • the separating element 30 By providing the separating element 30 on the rear side 32 of the porous evaporator medium 28, it is ensured that the liquid fuel introduced into it can evaporate only in the direction of the mixing chamber 16. A fuel evaporation to the rear, ie in the direction of the heating coil 38, is not possible, with the result that no deposits can be generated in this area. At the same time the risk of leakage of liquid fuel at the back 32 of the porous evaporator medium 28 is completely prevented. To this end, the separating element 30, which completely covers the porous evaporator medium 28, contributes to this. Furthermore contributes to that by cooperation of the line 36 with the nozzle 34 in this area fuel can not escape in liquid form.
  • the escape of liquid fuel or a fuel vapor is prevented by the fact that this edge region is completely surrounded first by the component 24 and thus in cooperation with the peripheral wall member 20 is a virtually liquid and vapor-tight closure the porous evaporator medium 28 is provided to the outside.
  • This can be further supported by the fact that the porous evaporator medium 28 is clamped together with the separating element 30 between the shoulder 26 and the peripheral wall member 28 and thus is compressed there. In this case, the escape of both liquid and vapor fuel over the outer peripheral edge 46 of the porous evaporator medium 28 is practically impossible.
  • porous evaporator medium 28 may be prepared together with the separating element 30, for example, characterized in that the provided for the construction of the porous evaporator medium 28, the chip-like or wire-like material is applied to a metal plate blank and then subjected to a sintering process. It is thus created a solid and stable composite, which can receive its final peripheral shape, such as a circular shape, only later in a punching process.
  • FIG. 2 A modified embodiment is in Fig. 2 shown.
  • the separating element 30 no longer has a planar, plate-like configuration, but a shell-like configuration with a bottom region 50 and a peripheral wall region 52.
  • the porous evaporator medium 28 is fitted, so that its outer peripheral edge 46 is covered by the separating element 30.
  • the heating coil 38 is again located on the rear side of the separating element 30, followed by the insulating material 40 and the holding plate 42.
  • the separating element 30 is now held between this holding plate 42 or the securing ring 44 and a radially inwardly extending projection 54 of the component 24.
  • the assembly comprising the porous evaporator medium 28 and the separator 30 may be manufactured as described above.
  • the connection between the porous evaporator medium 28 and the separating element 30 can be realized for example by sintering.
  • the above-mentioned compression of the porous evaporator medium 28 in the separating element 30 can contribute to the fixation, since this can lead to an expansion of the evaporator medium 28 radially outward and thus pinching on the separating element 30.
  • FIGS. 3 and 4 show with their essential components. It can be seen again the shell-like designed partition member 30 with its bottom portion 50 and its peripheral wall portion 52. In the nozzle 34, the fuel line 36 is inserted. At the bottom region 50, an example circular depression 58 is formed. In this, a deflection element 60 is added to the rear side 32 of the porous evaporator medium 28. This is opposite to an outlet end 62 of the fuel line 36 and ensures that the liquid fuel emerging there can not enter the porous evaporator medium 28 directly in this area. Rather, the initially still liquid fuel is deflected to the outside and thus pre-distributed over a larger surface area of the back of the porous evaporator medium 28.
  • channels 64 are formed on the bottom region 50, which further direct the liquid fuel outwardly toward the outer edge 46 of the porous evaporator medium and thus provide for a faster and more uniform pre-distribution before the liquid fuel enters the porous evaporator medium 28 at the rear 32 thereof.
  • the porous evaporator medium 28 is multi-layered, here, for example, three layers, with layers 66, 68 and 70 is constructed.
  • the ply 66 provides the backside 32 while the ply 70 provides the frontal 56.
  • the layer 66 may be formed so that it very quickly absorbs liquid fuel and makes a coarse distribution in its volume range.
  • the then somewhat finely pored layer 68 for example, can make the liquid fuel already predistributed to it from the layer 66 uniform, while the layer 70 can also be optimized with regard to the thermal loads that occur.
  • FIG. 5 Another variation is in Fig. 5 shown.
  • the fuel line 36 is introduced into the bottom region 50 or the connecting piece 34 provided thereon.
  • the fuel line 36 passes through not only an inlet opening 72 on the separating element 30, but also a corresponding opening in the porous evaporator medium 28 completely.
  • the fuel line 36 thus protrudes beyond the front 56 of the porous evaporator medium 28 in the direction of the mixing chamber 16 and holds by a disk 74 fixed thereto the porous
  • the disk 74 also serves to forcibly force an improved distribution of the liquid fuel emerging from the fuel line 36 and entering the volume range of the porous evaporator medium 28 directly, since this is not directly in the range the fuel line 36 can emerge from the porous evaporator medium 28 again.
  • the fuel line 36 has a plurality of radially outwardly extending passage openings 76, the liquid supplied by a central opening 78 liquid in the discharge end region 62 directly into the under pressure lead against the outside of the fuel line 36 held porous evaporator medium 28. It will be understood that the central opening 78 is sealed at the end of the fuel line 36 which is engaged in the mixing chamber 16.
  • the fuel line 36 at its discharge end 62 has a blade-like edge 80. This is held under pressure against the back 32 of the porous evaporator medium 28. In this way, too, it is ensured that the entire fuel supplied via the central opening 78 of the fuel line 36 enters the volume region of the porous evaporator medium 28 and does not run out again at the rear in the area of the junction. This is further prevented by the fact that, as already stated above, substantially the entire rear side 32 is covered by the separating element 30, namely the bottom region 50 thereof.
  • the solid bond between the fuel line 36 and the separator 30 in the region of the nozzle 34 can be done for example by soldering or by clamping fit.
  • a baffle 74 opposite.
  • FIG. 7 Figure 3 is an axial view of a porous evaporator medium 28 as may be employed in the previously described embodiments. It can be seen with respect to the center of the here circular shaped contour of the porous evaporator medium 28 offset fuel injection in the fuel line 36. Next can be seen under the fuel inlet an approximately U-shaped formation 82 in the porous evaporator medium 28, which the flow behavior of the fuel in the porous evaporator medium 28th affected. This formation 82 can contribute, for example, by locally compacting the porous evaporator medium to build up a flow barrier, that is to say a region with increased flow resistance.
  • This depression 88 serves to pre-distribute the fuel before it is picked up in the volume range of the porous evaporator medium 28, ie, similar to the embodiment according to FIGS FIGS. 3 and 4 to provide a channel arrangement that allows a rough pre-distribution of the fuel.
  • the present invention provides an evaporator arrangement, which ensures that the fuel or hydrocarbon to be vaporized reaches the volume region of the porous evaporator medium as uniformly as possible, can practically no longer emerge from this volume region at the rear side facing away from a mixing chamber and at the front side facing a mixing chamber as uniformly as possible and with as efficient utilization as possible the entire surface of this front can evaporate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel Cell (AREA)
  • Hydrogen, Water And Hydrids (AREA)

Claims (11)

  1. Arrangement d'évaporateur pour émettre une vapeur de combustible dans une chambre de mélange, comprenant un médium d'évaporateur poreux (28), un arrangement de conduits (36) menant du combustible liquide au médium d'évaporateur poreux (28), et un dispositif de chauffage (38) à une face arrière (32) du médium d'évaporateur poreux (28), détourné ou détournable de la chambre de mélange (16), un séparateur (30) étant arrangé entre le médium d'évaporateur poreux (28) et le dispositif de chauffage (38) pour empêcher un contact direct entre ces derniers, caractérisé par une formation de guidage du flux de combustible (82, 88) étant formé dans le médium d'évaporateur poreux (28) par des régions comprimées par estampage du médium d'évaporateur poreux (28).
  2. Arrangement d'évaporateur selon la revendication 1,
    caractérisé par le séparateur (30) étant constitué par un matériel qui est un bon conducteur de chaleur, de préférence par du métal.
  3. Arrangement d'évaporateur selon la revendication 1 ou 2,
    caractérisé par le séparateur (30) couvrant essentiellement l'entière face arrière (32) du médium d'évaporateur poreux (28).
  4. Arrangement d'évaporateur selon une des revendications 1 à 3,
    caractérisé par le séparateur (30) enchevauchant une région extérieure (46) du médium d'évaporateur poreux (28).
  5. Arrangement d'évaporateur selon une des revendications 1 à 4,
    caractérisé par le séparateur (30) comprenant une ouverture d'insertion de combustible (72) pour l'arrangement de conduits (36).
  6. Arrangement d'évaporateur selon la revendication 5,
    caractérisé par un arrangement de canaux pour la distribution du combustible (64) étant prévu au séparateur (30) et s'étendant de l'ouverture du conduit d'insertion de combustible (72).
  7. Arrangement d'évaporateur selon la revendication 5 ou 6,
    caractérisé par l'arrangement de conduits (36) s'étendant à travers l'ouverture du conduit d'insertion de combustible (72) et étant tenu sous pression contre le médium d'évaporateur poreux (28) par une extrémité de décharge.
  8. Arrangement d'évaporateur selon une des revendications 1 à 7,
    caractérisé par le médium d'évaporateur poreux (28) comprenant un contour circonférentiel adapté à un contour circonférentiel de la chambre de mélange (16), de préférence à celui d'une région de fond (14) de cette dernière, et par l'arrangement de conduits (36) étant mené au médium d'évaporateur poreux (28) d'une manière excentrique.
  9. Arrangement d'évaporateur selon une des revendications 1 à 8,
    caractérisé par le médium d'évaporateur poreux (28) étant formé de couches multiples et par les couches (66, 68, 70) comprenant au moins en partie des conductibilités de combustible différentes.
  10. Dispositif de chauffage pour un véhicule, comprenant un arrangement d'évaporateur selon une des revendications 1 à 9.
  11. Arrangement de réformateur, comprenant un arrangement d'évaporateur selon une des revendications 1 à 9.
EP20050006431 2004-04-26 2005-03-23 Arrangement d'évaporateur Expired - Fee Related EP1598595B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410020129 DE102004020129B3 (de) 2004-04-26 2004-04-26 Verdampferanordnung und Verfahren zur Herstellung einer Verdampferanordnung
DE102004020129 2004-04-26

Publications (2)

Publication Number Publication Date
EP1598595A1 EP1598595A1 (fr) 2005-11-23
EP1598595B1 true EP1598595B1 (fr) 2010-09-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050006431 Expired - Fee Related EP1598595B1 (fr) 2004-04-26 2005-03-23 Arrangement d'évaporateur

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EP (1) EP1598595B1 (fr)
DE (2) DE102004020129B3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014005173A1 (de) * 2014-04-08 2015-10-08 Webasto SE Verfahren zur Herstellung einer Verdampferanordnung für einen Verdampferbrenner
RU2580751C1 (ru) * 2013-10-14 2016-04-10 Эбершпехер Клаймит Контрол Системз Гмбх Унд Ко. Кг Блок днища для блока камеры сгорания испарительной горелки и блок камеры сгорания испарительной горелки

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004057757A1 (de) * 2004-11-30 2006-06-01 J. Eberspächer GmbH & Co. KG Verdampferanordnung und Verfahren zur Herstellung einer Verdampferanordnung
EP1662199B1 (fr) 2004-11-30 2017-03-01 Eberspächer Climate Control Systems GmbH & Co. KG Évaporateur et procédé de fabrication dudit évaporateur
DE102005020148A1 (de) * 2005-04-29 2006-11-09 J. Eberspächer GmbH & Co. KG Verdampferanordnung, insbesondere für ein Fahrzeugheizgerät oder einen Reformer
DE102005045067A1 (de) 2005-09-21 2007-03-22 J. Eberspächer GmbH & Co. KG Reformer zur Bereitstellung von Wasserstoff, insbesondere für eine Brennstoffzelle in einem Fahrzeug
DE102007053488A1 (de) 2007-11-09 2009-05-14 J. Eberspächer GmbH & Co. KG Verdampferbaugruppe, insbesondere für einen Verdampferbrenner eines Fahrzeugheizgeräts, und Verfahren zu deren Herstellung
DE102011005103B4 (de) * 2011-03-04 2015-04-02 Eberspächer Climate Control Systems GmbH & Co. KG Brennkammerbaugruppe für einen Verdampferbrenner
DE102011050368A1 (de) 2011-05-15 2012-11-15 Webasto Ag Verdampferanordnung
DE102012101580B4 (de) 2012-02-27 2020-10-29 Webasto Ag Mobiles, mit flüssigem Brennstoff betriebenes Heizgerät
DE102012101577A1 (de) * 2012-02-27 2013-08-29 Webasto Ag Mobiles, mit flüssigem Brennstoff betriebenes Heizgerät
DE102012101576A1 (de) * 2012-02-27 2013-08-29 Webasto Ag Verdampferbrenner mit Abdeckung für ein mobiles Heizgerät
DE102013220652B4 (de) * 2013-10-14 2015-07-02 Eberspächer Climate Control Systems GmbH & Co. KG Brennkammerbaugruppe, insbesondere für einen Verdampferbrenner, insbesondere für ein Fahrzeugheizgerät

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DE3914611C2 (de) 1988-06-09 1996-09-26 Webasto Ag Fahrzeugtechnik Verdampfungsbrenner für ein mit flüssigem Brennstoff betriebenes Heizgerät
DE3900438A1 (de) 1989-01-10 1990-07-12 Webasto Ag Fahrzeugtechnik Heizgeraet, insbesondere fahrzeugheizgeraet
DE4003090C1 (fr) * 1990-02-02 1991-06-13 Webasto Ag Fahrzeugtechnik, 8035 Stockdorf, De
DE4401799C1 (de) * 1994-01-22 1995-06-14 Webasto Thermosysteme Gmbh Verdampfungsbrenner für ein Heizgerät
DE10130638A1 (de) * 2001-06-26 2003-01-02 Eberspaecher J Gmbh & Co Verdampferbrenner
DE10209967C5 (de) * 2002-03-07 2009-01-29 J. Eberspächer GmbH & Co. KG Verdampferelement für einen Verdampferbrenner
DE10325574A1 (de) 2003-06-05 2004-12-30 J. Eberspächer GmbH & Co. KG Brennkammeranordnung für einen Verdampferbrenner, insbesondere für ein Fahrzeugheizgerät

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2580751C1 (ru) * 2013-10-14 2016-04-10 Эбершпехер Клаймит Контрол Системз Гмбх Унд Ко. Кг Блок днища для блока камеры сгорания испарительной горелки и блок камеры сгорания испарительной горелки
DE102014005173A1 (de) * 2014-04-08 2015-10-08 Webasto SE Verfahren zur Herstellung einer Verdampferanordnung für einen Verdampferbrenner

Also Published As

Publication number Publication date
DE102004020129B3 (de) 2005-08-25
EP1598595A1 (fr) 2005-11-23
DE502005010200D1 (de) 2010-10-21

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