EP1647769A1 - Evaporateur, en particulier pour un dispositif de chauffage de voiture ou pour un réformeur - Google Patents

Evaporateur, en particulier pour un dispositif de chauffage de voiture ou pour un réformeur Download PDF

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Publication number
EP1647769A1
EP1647769A1 EP05020241A EP05020241A EP1647769A1 EP 1647769 A1 EP1647769 A1 EP 1647769A1 EP 05020241 A EP05020241 A EP 05020241A EP 05020241 A EP05020241 A EP 05020241A EP 1647769 A1 EP1647769 A1 EP 1647769A1
Authority
EP
European Patent Office
Prior art keywords
evaporator
evaporator medium
region
medium region
liquid
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
EP05020241A
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German (de)
English (en)
Other versions
EP1647769B1 (fr
Inventor
Wolfgang Pfister
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
Priority to PL05020241T priority Critical patent/PL1647769T3/pl
Publication of EP1647769A1 publication Critical patent/EP1647769A1/fr
Application granted granted Critical
Publication of EP1647769B1 publication Critical patent/EP1647769B1/fr
Not-in-force 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, in particular for a vehicle heater or a reformer, comprising an evaporator housing surrounding a evaporation chamber with a peripheral wall and a bottom wall, on a inside of the peripheral wall a porous evaporator medium and a liquid feed arrangement for introducing liquid to be evaporated in the evaporator medium.
  • Such an evaporator arrangement is known from DE 195 29 994 A1.
  • the evaporator arrangement known from this document provides with its evaporation chamber a combustion chamber for a vehicle heater.
  • the evaporator medium is provided as a porous, cylindrical lining which covers the peripheral wall substantially at its entire inner surface.
  • the size of the evaporator medium and thus also the surface exposed to the evaporation chamber depend on the amount of liquid vapor to be supplied. For example, when used in a heater, this amount is determined by the required heating power. The higher this heating power, the greater the amount of fuel vapor to be provided per unit of time. Accordingly, the surface of the evaporator medium which is exposed to the evaporation chamber or combustion chamber in this case must also be selected such that the required amount of fuel vapor can be released in total per unit of time.
  • an evaporator arrangement in particular for a vehicle heater or a reformer, comprising an evaporation chamber surrounding an evaporation chamber with a peripheral wall and a bottom wall, on an inner side of the peripheral wall, a porous evaporator medium and a liquid feed arrangement for introducing liquid to be evaporated in the evaporator medium ,
  • the evaporator medium has a first evaporator medium region and, separated therefrom by a flow barrier, a second evaporator medium region.
  • the first evaporator medium region and the second evaporator medium region follow one another in the direction of a housing longitudinal axis surrounded by the circumferential wall.
  • the first evaporator medium region is closer to the bottom wall than the second evaporator medium region and that the liquid supply line arrangement opens into the first evaporator medium region.
  • the liquid supply line arrangement opens into the first evaporator medium region.
  • the first evaporator medium region or / and the second evaporator medium region can be of annular design, so that over the entire circumference a very uniform evaporation behavior can be achieved.
  • the first evaporator medium region and the second evaporator medium region have different thickness and / or different length with respect to a housing longitudinal axis surrounded by the peripheral wall and / or different material.
  • the flow barrier between the two evaporator medium regions can be formed for example by a gap. In this intermediate space itself, there is no direct connection between the two evaporator medium regions, so that the capillary flow which promotes the liquid in the interior volume region of the evaporator medium is interrupted here.
  • At least one flow connection region bridging the flow barrier and connecting the first evaporator medium region and the second evaporator medium region is provided. This means that certain volume regions are present, in which nevertheless a capillary flow is present between the first evaporator medium region and the second evaporator medium region, due to the clearly reduced cross section, however, only a comparatively small amount can be delivered.
  • the greater part of the liquid transported from the first evaporator medium region to the second evaporator medium region is then transported in the direction of the second evaporator medium region, in particular in the case of a high required rate of evaporation, in liquid form and not conveyed by capillary conveying action.
  • the present invention further relates to a vehicle heater with an evaporator arrangement according to the invention for generating and combustion of a fuel / air mixture.
  • a vehicle heater can be used for example as a heater or heater.
  • the invention relates to a reformer with an evaporator arrangement according to the invention.
  • a reformer may then be provided a hydrocarbon / air mixture which is decomposed by a catalytic reaction and thus provides hydrogen by hydrogen abstraction.
  • The then can be used for example in a fuel cell.
  • an evaporator assembly according to the invention is generally designated 10.
  • this evaporator assembly 10 will be described with reference to use in a vehicle heater.
  • the liquid to be supplied and vaporized will be fuel, for example gasoline, diesel or vegetable methyl ester.
  • the same structural and functional measures can also be provided when the evaporator assembly 10 is used in a reformer to provide hydrogen gas.
  • the evaporator arrangement 10 comprises an evaporator housing 12 with a substantially cylindrical peripheral wall 14 provided with a circular cross-section and a bottom wall 16.
  • the circumferential wall 14 is elongate in the direction of a longitudinal axis A or surrounds it concentrically, for example.
  • an evaporation chamber 18 is limited, which is then effective as a combustion chamber in the case of a vehicle heater.
  • This evaporation chamber 18 is open via a flame cover 20 in the direction of a flame tube 22.
  • the combustion product or mixture of vaporized liquid and air flows in the evaporator housing 12 substantially in the direction of the longitudinal axis A.
  • porous evaporator medium On an inner side 28 of the peripheral wall 14 is a generally designated 30 provided porous evaporator medium.
  • This porous evaporator medium can be formed, for example, from braided, knitted, foamy or other porous material. Porous here means that in the volume range of this evaporator medium 30 cavities are formed, whose cross-section is dimensioned such that, taking into account the physical properties of the liquid to be introduced and vaporized a Kapillar once bin is achieved. As a result of this capillary-conveying effect, the liquid fed once into the interior volume region of the evaporator medium 30 is conveyed forward and distributed more or less evenly.
  • the evaporator medium 30 is subdivided into two evaporator medium regions 32, 34.
  • the two evaporator medium regions 32, 34 are substantially ring-like and therefore extend in the circumferential direction about the longitudinal axis A essentially completely on the inner side 28 of the circumferential wall 14.
  • the two evaporator medium regions 32, 34 can be provided by cutting or punching out the required material sections from a sheet-like blank and curved insertion into the evaporation chamber 18. It can of course be provided that the evaporator medium regions 32, 34 are locked on the inside 28 of the peripheral wall 14, for example by gluing or in any other way.
  • the first evaporator medium region 32 is arranged such that it lies, for example, directly in the region in which the peripheral wall 14 and the bottom wall 16 adjoin one another. That is, this first evaporator medium portion 32 may extend along a portion of the axial length of the evaporation chamber 18 from the bottom wall 16. In the example shown, this axial extent of the first evaporator medium region 32 is somewhat smaller than the axial extent of the air inlet nozzle 24, viewed in each case from the bottom wall 16. In the region of the first evaporator medium region 32 Furthermore, an ignition element 33, which is indicated only schematically, is provided, which serves to ignite a mixture of fuel and liquid generated in the evaporation chamber 18 by generating locally high temperatures.
  • a flow barrier formed in the form of a gap 36 is provided between the first evaporator medium region 32 and the second evaporator medium region 34. That There is no direct physical contact between the two evaporator medium regions 32, 34, so that no direct capillary flow transition between these two evaporator medium regions 32, 34 can take place.
  • the axial extent of this gap 36 may be in the range of 1 mm to 5 mm.
  • the second evaporator medium region 34 is then in the illustrated example in the length range of the evaporation chamber 18, which is located between the axial end of the air inlet nozzle 24 and the flame cover 20.
  • the two evaporator medium regions 32, 34 differ with regard to their axial extension length L 1 and L 2 and also with regard to their thickness D 1 and D 2 .
  • the first evaporator medium region 32 has a greater axial length L 1 , but is designed with a smaller thickness D 1 than the second evaporator medium region 34. This can of course also be reversed.
  • a portion of the liquid fuel must be supplied in the region of the ignition device 33 via a so-called candle neck.
  • the ignition element For example, a glow plug of metallic or ceramic design.
  • the supply line 38 can pass through the peripheral wall 14 and open, for example, in an annular groove which is provided on the inner side 28 of the peripheral wall 14.
  • the liquid fuel can then be distributed in the circumferential direction before it enters the interior volume region of the first evaporator medium region 32.
  • a very uniform distribution of the liquid to be evaporated is achieved.
  • the evaporator arrangement 10 shown in FIG. 1 takes effect as follows:
  • first evaporator medium region 32 If only a comparatively small quantity of liquid or fuel is to be vaporized, then, after being introduced into the first evaporator medium region 32, it will distribute under the aforementioned capillary action in the first evaporator medium region and will also reach the surface exposed to the evaporation chamber 18. The entire fuel distributed by capillary action is transferred into the vapor phase in the region of the first evaporator medium region 32, namely by removing the required heat of vaporization from the first evaporator medium region 32. This heat of vaporization, in turn, is provided by the combustion taking place in the region of the evaporation chamber 18.
  • the amount of liquid fuel supplied must also be increased accordingly.
  • the entire liquid fuel can no longer be transferred from the first evaporator medium region 32 into the vapor phase.
  • the flow barrier ie in FIG. 1 the intermediate space 36
  • This suction effect results from the fact that the second evaporator medium region 34 also provides a capillary action for the liquid fuel to be delivered.
  • the evaporator arrangement 10 In order to achieve this transition between the two evaporator medium regions 32, 34, it is advantageous to arrange the evaporator arrangement 10 such that the longitudinal axis A is substantially horizontal or even inclined somewhat downwards starting from the bottom wall 16, so that the one from the first evaporator medium region 32 leaking liquid then gravity flow over the gap 36 away in the direction of the second evaporator medium region 34 will flow.
  • the dimensions of the various evaporator medium regions 32, 34 can be selected and optimized as a function of the specific requirements or also of the dimensions of the evaporator housing 12.
  • the material used can also differ in the two evaporator medium regions 32, 34, so that an optimization can also take place here. In particular, this selection of the dimensions and also of the material can be made depending on the type of fuel or for which type of liquid to be delivered the insert is provided.
  • FIG. 2 shows an embodiment in which, compared to FIG. 1, a significantly different dimensioning is present.
  • the two evaporator medium regions 32, 34 are designed here with the same thickness D, but in turn have a different amount L 1 and L 2 .
  • the second evaporator medium region 34 is significantly longer than the first evaporator medium region 32.
  • a plurality of flow connection sections 40 are provided between the two evaporator medium regions 32, 34. These sections 40 formed integrally with the two evaporator medium regions 32, 34 bridge the flow barrier generated by the intermediate space 36 at some peripheral regions and ensure that at least a small amount of the liquid to be evaporated can flow into the second evaporator medium region 34 under capillary action.
  • the number and the flow cross section of the sections 40 can, of course, also be selected here so that the desired evaporation behavior or the desired distribution between the two evaporator medium regions 32, 34 is achieved. In this embodiment, it makes sense to provide the two evaporator medium regions 32, 34 with the same thickness D, since these can then be cut or punched out with the sections 40 from a single sheet-like piece of material having a uniform thickness.
  • the flow barrier may not or not necessarily be provided by a gap 36. It is also conceivable, for example, to locally influence a continuous material body of the evaporator medium 30 in a different manner such that a flow barrier for the capillary flow is present. This can be done, for example, by introducing material that closes the pores locally, for example adhesive, but can also be done, for example, by local compression and thus sealing the pores are made.
  • an evaporator arrangement With the embodiment of an evaporator arrangement according to the invention, it is possible to provide a much longer service life with significantly lower deposition of combustion products by more uniform liquid or fuel evaporation and, in particular, avoidance of local overheating of the evaporator medium. Also, the adaptability of the volume used for evaporation as a function of the amount of liquid fed in a significantly better controllability of the evaporation behavior and thus a significantly better controllability of heating performance achieved in heaters.
  • supply lines are provided separately for each of the evaporator medium regions, so that activation or deactivation of the respective evaporator medium regions can take place by directly feeding or not feeding fuel into them. This allows greater freedom in the installation position of the evaporator arrangement, since then the transition of the liquid between the two evaporator medium areas by gravity flow is no longer required.

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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)
  • Wick-Type Burners And Burners With Porous Materials (AREA)
  • Air-Conditioning For Vehicles (AREA)
EP05020241A 2004-10-15 2005-09-16 Evaporateur, en particulier pour un dispositif de chauffage de voiture ou pour un réformeur Not-in-force EP1647769B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05020241T PL1647769T3 (pl) 2004-10-15 2005-09-16 Układ do odparowywania, zwłaszcza do samochodowego urządzenia grzewczego lub reaktora do reformowania

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004050361A DE102004050361B3 (de) 2004-10-15 2004-10-15 Verdampferanordnung, insbesondere für ein Fahrzeugheizgerät oder einen Reformer

Publications (2)

Publication Number Publication Date
EP1647769A1 true EP1647769A1 (fr) 2006-04-19
EP1647769B1 EP1647769B1 (fr) 2009-12-02

Family

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EP05020241A Not-in-force EP1647769B1 (fr) 2004-10-15 2005-09-16 Evaporateur, en particulier pour un dispositif de chauffage de voiture ou pour un réformeur

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EP (1) EP1647769B1 (fr)
DE (1) DE102004050361B3 (fr)
PL (1) PL1647769T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006024221A1 (de) * 2006-05-23 2007-11-29 J. Eberspächer GmbH & Co. KG Verdampferbaugruppe, insbesondere für ein Fahrzeugheizgerät oder eine Reformeranordnung eines Brennstoffzellensystems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013200016A1 (de) 2013-01-02 2014-07-03 Eberspächer Climate Control Systems GmbH & Co. KG Katalytischer Brenner, insbesondere für eine Fahrzeugheizung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377797A2 (fr) * 1989-01-10 1990-07-18 Webasto AG Fahrzeugtechnik Appareil de chauffage, notamment appareil de chauffage pour véhicule
DE19529994A1 (de) 1994-11-10 1996-05-15 Eberspaecher J Verdampferbrenner für ein Heizgerät
DE10244812A1 (de) * 2002-09-27 2004-04-15 J. Eberspächer GmbH & Co. KG Auskleidung für die Brennkammer eines Heizgerätes, insbesondere Fahrzeugheizgerätes
DE10255361B3 (de) * 2002-11-27 2004-06-17 J. Eberspächer GmbH & Co. KG Brennkammerbaugruppe für ein Heizgerät, insbesondere Fahrzeugheizgerät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377797A2 (fr) * 1989-01-10 1990-07-18 Webasto AG Fahrzeugtechnik Appareil de chauffage, notamment appareil de chauffage pour véhicule
DE19529994A1 (de) 1994-11-10 1996-05-15 Eberspaecher J Verdampferbrenner für ein Heizgerät
DE10244812A1 (de) * 2002-09-27 2004-04-15 J. Eberspächer GmbH & Co. KG Auskleidung für die Brennkammer eines Heizgerätes, insbesondere Fahrzeugheizgerätes
DE10255361B3 (de) * 2002-11-27 2004-06-17 J. Eberspächer GmbH & Co. KG Brennkammerbaugruppe für ein Heizgerät, insbesondere Fahrzeugheizgerät

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006024221A1 (de) * 2006-05-23 2007-11-29 J. Eberspächer GmbH & Co. KG Verdampferbaugruppe, insbesondere für ein Fahrzeugheizgerät oder eine Reformeranordnung eines Brennstoffzellensystems
US7661661B2 (en) 2006-05-23 2010-02-16 J. Eberspächer GmbH & Co. KG Evaporator assembly unit, especially for a vehicle heater or a reformer arrangement of a fuel cell system

Also Published As

Publication number Publication date
DE102004050361B3 (de) 2006-03-30
PL1647769T3 (pl) 2010-05-31
EP1647769B1 (fr) 2009-12-02

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