US20170211813A1 - Film evaporator burner arrangement - Google Patents

Film evaporator burner arrangement Download PDF

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Publication number
US20170211813A1
US20170211813A1 US15/500,306 US201515500306A US2017211813A1 US 20170211813 A1 US20170211813 A1 US 20170211813A1 US 201515500306 A US201515500306 A US 201515500306A US 2017211813 A1 US2017211813 A1 US 2017211813A1
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United States
Prior art keywords
film evaporator
combustion chamber
fuel
combustion
combustion air
Prior art date
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Abandoned
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US15/500,306
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English (en)
Inventor
Martin Zoske
Volodymyr Ilchenko
Klaus Mösl
Vitali Dell
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Webasto SE
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Webasto SE
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Publication date
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Assigned to Webasto SE reassignment Webasto SE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DELL, VITALI, ILCHENKO, VOLODYMYR, ZOSKE, MARTIN, MOESL, KLAUS
Publication of US20170211813A1 publication Critical patent/US20170211813A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C5/00—Stoves or ranges for liquid fuels
    • F24C5/02—Stoves or ranges for liquid fuels with evaporation burners, e.g. dish type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/44—Preheating devices; Vaporising devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D5/00—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel
    • F23D5/02—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel the liquid forming a pool, e.g. bowl-type evaporators, dish-type evaporators
    • F23D5/04—Pot-type evaporators, i.e. using a partially-enclosed combustion space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D5/00—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel
    • F23D5/02—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel the liquid forming a pool, e.g. bowl-type evaporators, dish-type evaporators
    • F23D5/04—Pot-type evaporators, i.e. using a partially-enclosed combustion space
    • F23D5/045—Pot-type evaporators, i.e. using a partially-enclosed combustion space with forced draft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D5/00—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel
    • F23D5/06—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel the liquid forming a film on one or more plane or convex surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/21—Burners specially adapted for a particular use
    • F23D2900/21002—Burners specially adapted for a particular use for use in car heating systems

Definitions

  • the present invention relates to a film evaporator burner arrangement and to a mobile heating appliance with such a film evaporator burner arrangement.
  • a “mobile heating appliance” is understood to mean a heating appliance which is designed for use in mobile applications and is adapted accordingly. This means in particular that it is transportable (optionally fixedly installed in a vehicle or merely accommodated therein for transport) and is not designed exclusively for permanent, stationary use, as is the case for example in the case of heating a building.
  • the mobile heating appliance may in this respect also be installed fixedly in a vehicle (ground vehicle, ship etc.), in particular in a ground vehicle. It may in particular be designed to heat a vehicle interior, such as for example of a ground vehicle or water- or aircraft, and a partially open space, such as may be found for example on ships, in particular yachts.
  • the mobile heating appliance may also be put to temporary stationary use, such as for example in large tents, containers (for example portable buildings for construction sites), etc.
  • the mobile heating appliance may be designed as a parking heating system or auxiliary heating system for a ground vehicle, such as for example for a caravan, a motorhome, a bus, a car etc.
  • atomizing burners in which the liquid fuel is injected with an atomizing nozzle and mixed with combustion air
  • evaporator burners in which the liquid fuel is evaporated starting from an evaporator region of the burner arrangement.
  • the liquid fuel is conventionally supplied in liquid form to a porous, absorbent evaporator element, in which the fuel is distributed by capillary forces and starting from which the liquid fuel is evaporated with absorption of heat of evaporation.
  • the evaporated fuel is in this case mixed with supplied combustion air to yield a fuel-air mixture and the fuel-air mixture is reacted in the combustion chamber with release of heat.
  • the film evaporator burner arrangement comprises: a combustion chamber arrangement, which comprises a combustion chamber for reacting a fuel-air mixture with release of heat, which combustion chamber extends in an axial direction along a longitudinal axis; a combustion air feed for supplying combustion air, which is configured in such a way that combustion air with a tangential flow component is supplied to the combustion chamber arrangement at at least one combustion air inlet; a film evaporator surface for evaporating liquid fuel starting from a fuel film, which is arranged on a rear wall axially to the rear of the combustion air inlet; and a fuel feed for supplying liquid fuel to the film evaporator surface.
  • the film evaporator burner arrangement takes the form of an evaporator burner, relatively small heating powers may also be reliably provided, as is often desired in mobile heating appliances.
  • the problems which conventionally arise in evaporator burners which comprise porous, absorbent elements, such as in particular deposit formation in the evaporator element, high electricity consumption when starting the burner arrangement for heating up the evaporator element, elevated waste gas emissions on starting and termination of combustion operation due to fuel residues in the evaporator element, etc. are avoided, since evaporation of the liquid fuel in the film evaporator burner arrangement takes place starting from a film of the liquid fuel distributed on the film evaporator surface.
  • the arrangement of the film evaporator surface axially to the rear of the at least one combustion air inlet in this case enables defined input of heat from the combustion process in the combustion chamber to the film evaporator surface by way of heat radiation and targeted convection.
  • At least one combustion air inlet here means that a plurality of separate combustion air inlets may for example also be provided, wherein even in the case of such a plurality of combustion air inlets, the film evaporator surface is nonetheless arranged to the rear of the respective combustion air inlets relative to the axial direction.
  • the film evaporator surface may in this case be formed, for example, by a substantially smooth metallic area of the rear wall.
  • the rear wall may here in particular be formed by a rear wall of the combustion chamber arrangement, i.e. of the combustion chamber itself or a pre-evaporation chamber arranged flow-wise upstream thereof, or for example also by a rear wall of an evaporation region arranged in the combustion chamber arrangement.
  • the supplied combustion air thus comprises a direction component in the circumferential direction, but may preferably also comprise further direction components, for example directed radially inwards and/or in the axial direction.
  • the combustion air is preferably supplied to the combustion chamber arrangement with very strong swirl.
  • the film evaporator burner arrangement according to the invention then enables operation in which substantially no deposits are formed from the fuel.
  • the combustion chamber may in particular be configured for reaction of the fuel-air mixture under flaming combustion; however, a configuration for reaction of the fuel-air mixture under partially or fully catalytic combustion is for example also possible.
  • the fuel feed is in this case preferably configured such that the liquid fuel is supplied without atomization or nebulization to the film evaporator surface, particularly preferably flowing out thereto at low pressure.
  • the fuel feed in this case does not comprise any atomization nozzles.
  • combustion air is supplied to the combustion air inlet from radially outside, particularly good distribution of the fuel film on the film evaporator surface is achieved.
  • the combustion air thus has both a tangential and a radially inwardly directed flow component.
  • the film evaporator surface is configured to be free of porous, absorbent bodies, deposit formation on the film evaporator surface may be reliably prevented. Low-deposit evaporation is achieved in particular with a combination of low component temperatures and a configuration free of porous, absorbent bodies.
  • the film evaporator surface extends predominantly perpendicularly to the longitudinal axis.
  • the film evaporator surface may for example extend in a substantially planar manner, or indeed have a convexly outwardly curved shape or a concavely inwardly curved shape or the like.
  • the film evaporator surface may preferably extend over substantially the entire cross-section of the rear wall of the combustion chamber arrangement to achieve as large as possible an area of fuel evaporation.
  • the combustion air supply is configured such that the combustion air with the tangential flow component is supplied to the combustion chamber.
  • the combustion chamber arrangement does not have a pre-evaporation chamber for pre-processing a fuel-air mixture prior to inlet into the combustion chamber, but rather mixing of the evaporated fuel with the supplied combustion air to yield a fuel-air mixture takes place in the combustion chamber itself.
  • a structurally particularly simple and inexpensive embodiment is thus made possible.
  • the combustion chamber arrangement comprises a pre-evaporation chamber arranged flow-wise upstream of the combustion chamber for pre-processing a fuel-air mixture prior to entry thereof into the combustion chamber.
  • a pre-evaporation chamber is here understood to mean a region of the combustion chamber arrangement in which evaporation of fuel and intermixing of evaporated fuel with supplied combustion air to yield a fuel-air mixture takes place, but in regular operation of the burner no exothermic reaction of the mixture takes place, in particular no flame forms.
  • the pre-evaporation chamber therefore does not itself form part of the combustion chamber, but rather is arranged flow-wise upstream thereof.
  • the pre-processing of the fuel-air mixture enabled in this way prior to entry thereof into the combustion chamber allows particularly low-pollutant combustion.
  • the pre-evaporation chamber is separated from the combustion chamber by a partition wall extending radially inwards from a side wall of the combustion chamber arrangement.
  • subdivision of the combustion chamber arrangement into the combustion chamber and the pre-evaporation chamber arranged flow-wise upstream thereof is achieved in a structurally particularly simple and thus inexpensive manner.
  • the film evaporator surface located at the rear wall of the combustion chamber arrangement may particularly advantageously be thermally insulated relative to the combustion chamber as regards thermal conduction, such that input of heat to the film evaporator surface may proceed mainly via heat radiation and convection.
  • the input of heat to the film evaporator surface may be very purposefully adjusted by the structural configuration of the partition wall.
  • the partition wall extends radially inwards and axially rearwards from the side wall. In this case, particularly advantageous flow control is achieved, in which the fuel film is distributed particularly reliably over the film evaporator surface.
  • the pre-evaporation chamber has a smaller cross-section than the combustion chamber in the direction perpendicular to the longitudinal axis and the flow cross-section widens abruptly on transition from the pre-evaporation chamber to the combustion chamber.
  • Abrupt widening is here understood to mean widening with a double opening angle of greater than 90°. In this case, particularly good flow stabilization is achieved.
  • the combustion air feed is configured such that the combustion air with the tangential flow component is supplied to the pre-evaporation chamber.
  • particularly efficient mixing of evaporated fuel and supplied combustion air to yield a fuel-air mixture may take place in the pre-evaporation chamber.
  • the fuel feed is configured such that the fuel with a tangential direction component is supplied radially from outside to the film evaporator surface.
  • the fuel is in this case supplied to the combustion chamber arrangement substantially in the same direction as the combustion air. This type of fuel feed results in particularly good distribution of the fuel film on the film evaporator surface.
  • the combustion chamber is configured to be free of constrictions or contractions over its axial extent.
  • the combustion chamber in this case has a maximally free flow cross-section. Since no constrictions or contractions are present, a particularly robust embodiment with a long service life is achieved. Due to the described geometric configuration of the combustion chamber, good stabilization of the flame is nonetheless achieved in the combustion chamber.
  • the object is also achieved by a mobile heating appliance with such a film evaporator burner arrangement as claimed in claim 13 .
  • FIG. 1 is a schematic representation of a film evaporator burner arrangement according to a first embodiment.
  • FIG. 2 is a schematic representation of a swirl body for the combustion air feed according to the embodiment.
  • FIG. 3 is a schematic representation of a film evaporator burner arrangement according to a second embodiment.
  • FIG. 4 is a schematic representation of a film evaporator burner arrangement according to a third embodiment.
  • FIG. 5 is a schematic representation of a film evaporator burner arrangement according to a fourth embodiment.
  • FIG. 6 is a schematic representation of a first modification of the fourth embodiment.
  • FIG. 7 is a schematic representation of a second modification of the fourth embodiment.
  • FIG. 8 is a schematic representation of a third modification of the fourth embodiment.
  • a film evaporator burner arrangement 1 is described in greater detail below with reference to FIG. 1 and FIG. 2 .
  • the film evaporator burner arrangement 1 is designed for a mobile heating appliance, in particular for a parking heating appliance or auxiliary heating appliance for a motor vehicle, which in particular comprises a heat exchanger (not shown) for transferring heat from the outflowing combustion waste gases to a medium to be heated.
  • the medium to be heated may, for example in the case of a hot-air heater, take the form of air to be heated for a vehicle interior or, in the case of a liquid heater, take the form of a liquid to be heated in a liquid circuit of a vehicle, in particular cooling liquid.
  • the heat exchanger may, in a manner known per se, be configured such that it surrounds the combustion chamber and/or a flame tube adjacent thereto substantially in the manner of a cup.
  • the mobile heating appliance further comprises, in a manner known per se, a fuel delivery device for delivering the liquid fuel, which may in particular take the form of diesel, gasoline, ethanol, or the like.
  • the fuel delivery device may in particular take the form of a fuel metering pump.
  • the mobile heating appliance comprises a combustion air delivery device for delivering the combustion air, which may in particular take the form of a blower, a control unit for controlling operation of the mobile heating appliance and further components necessary for operation, which are not described in any greater detail, in particular for example temperature sensors, etc.
  • the film evaporator burner arrangement 1 comprises a combustion chamber 2 , which, in the example shown, is approximately cylindrical in shape and extends along a longitudinal axis Z.
  • the combustion chamber 2 is bounded circumferentially by a peripheral side wall 21 , which may for example be formed from a high-temperature resistant steel.
  • a main direction of flow H in which combustion waste gases flow out from the combustion chamber 2 to the heat exchanger (not shown) extends substantially parallel to the longitudinal axis Z.
  • the combustion chamber arrangement 1 is closed at the rear by a rear wall 3 , which is formed in the first embodiment by a rear wall of the combustion chamber 2 .
  • the rear wall 3 is formed on the side facing the combustion chamber 2 as a film evaporator surface 4 on which a film of the liquid fuel is distributed, starting from which evaporation of the liquid fuel takes place.
  • FIG. 1 shows a completely flat configuration of the rear wall 3 , it is also possible, for example, to make the rear wall 3 convex or concave in the direction of the combustion chamber 2 .
  • the film evaporator surface 4 takes the form of a substantially smooth metallic area; however, it is for example also possible to provide the film evaporator surface 4 with roughening or fine texturing, in order to improve distribution of the liquid fuel, wetting of the film evaporator surface 4 and fuel evaporation.
  • a combustion air feed 5 shown schematically in FIG. 1 is additionally provided, via which combustion air with a significant tangential flow component, i.e. strong swirl, is introduced into the combustion chamber 2 .
  • the combustion air feed 5 comprises a swirl body 6 with a plurality of air ducts or air blades, in order to impart the desired strong swirl to the combustion air.
  • FIG. 2 is a diagrammatic representation of a possible embodiment of the swirl body 6 .
  • the swirl body 6 depicted by way of example is substantially annular in shape and a plurality of combustion air ducts 7 are formed in the wall of the swirl body 6 , via which combustion air may pass from the outside of the swirl body 6 to the inside of the swirl body 6 .
  • the combustion air is supplied to the combustion air ducts 7 on the outside of the swirl body 6 via a combustion air delivery device, as shown schematically by fat arrows, flows through the combustion air ducts 7 and enters the combustion chamber 2 on the inside of the swirl body 6 at combustion air inlets 8 .
  • combustion air inlets 8 Although the exemplary embodiment shown schematically depicts four such combustion air inlets 8 , fewer than four, but at least one combustion air inlet 8 , or more than four combustion air inlets 8 may also be provided. As a result of the curved shape of the combustion air ducts 7 , which additionally taper inwards, the combustion air is provided with strong swirl and at the same time accelerated, as shown schematically in FIG. 2 by thin arrows.
  • the combustion air passing from the swirl body 6 into the combustion chamber 2 at the combustion air inlets 8 thus has a significant tangential direction component, i.e. strong swirl, and also at least one radially inwardly directed direction component.
  • a fuel feed 9 is provided which opens into the side wall 21 to the rear of the combustion air inlets 8 with regard to the main direction of flow H. Via the fuel feed 9 liquid fuel, which may in particular take the form of gasoline, diesel, ethanol or the like, is supplied to the film evaporator surface 4 at the rear wall 3 .
  • FIG. 1 shows just one fuel line and one fuel outlet to the film evaporator surface 4 in the form of fuel feed 9 , it is also possible, for example, to provide a plurality of fuel lines and/or a plurality of fuel outlets.
  • an ignition element 11 for starting the reaction of the fuel-air mixture is arranged in the combustion chamber 2 , this being formed in the schematically depicted exemplary embodiment for example by a glow plug.
  • the ignition element 11 projects from radially outside into the combustion chamber 2
  • the ignition element 11 may for example also project axially from behind through the rear wall 3 into the combustion chamber 2 .
  • the temperature established at the film evaporation surface 4 during operation of the film evaporator burner arrangement 1 is determined by the thermal energy introduced into the combustion chamber 2 by the flame. This thermal energy is here transferred by convection, via heat radiation and via thermal conduction in the material of the side wall 21 .
  • the optimum temperature for reliable evaporation of the liquid fuel during operation of the film evaporator burner arrangement 1 may be established.
  • the thorough intermixing of the fuel film 10 results in the “washing off” of incipient deposits on the rear wall 3 , so enabling operation of the film evaporator burner arrangement 1 at least substantially without deposits from the fuel.
  • the combustion chamber 2 is formed with an at least substantially free flow cross-section free of constrictions or contractions, so meaning that the flows of the gases in the combustion chamber 2 may be adjusted as desired.
  • a film evaporator burner arrangement 1 has thus been described which is structurally simple and inexpensive to produce. Since no additional porous evaporator element is provided, problems concomitant with such an evaporator element are reliably avoided.
  • the robust configuration results in relatively low sensitivity with regard to component tolerances, which likewise has a positive effect on manufacturing costs. Reduced deposit formation and thus a long service life, low emissions and low sensitivity to coarse fuel impurities are also achieved.
  • the useful evaporation area is variable, such that a large range of different heating powers can be provided and a large number of different liquid fuels may be used.
  • the electrical power consumption needed for fuel feed is low and smoke and odor formation on start-up and burn-out of the film evaporator burner arrangement 1 is greatly reduced compared with evaporator burners with porous evaporator elements.
  • a second embodiment is described below with reference to FIG. 3 .
  • the same reference signs as for the above-described first embodiment are used for the corresponding components of the film evaporator burner arrangement 100 according to the second embodiment.
  • only the differences from the above-described first embodiment will be described in greater detail below.
  • the film evaporator burner arrangement 100 according to the second embodiment depicted schematically in FIG. 3 differs from the above-described first embodiment in that, in addition to the combustion chamber 2 , the combustion chamber arrangement also comprises a pre-evaporation chamber 12 arranged flow-wise upstream thereof for pre-processing the fuel-air mixture prior to entry thereof into the combustion chamber 2 , as described in greater detail below. Furthermore, the rear wall 3 of the combustion chamber arrangement, on which the film evaporator surface 4 is formed, is not flat in the second embodiment but rather on the side facing the combustion chamber 2 is concave in shape, indeed substantially conical in shape in the specific example shown.
  • the rear wall 3 of the combustion chamber arrangement and the film evaporator surface 4 are however not arranged in the combustion chamber 2 , in which reaction of the fuel-air mixture proceeds with release of heat, but rather in the pre-evaporation chamber 12 arranged flow-wise upstream thereof, such that the rear wall 3 of the combustion chamber arrangement forms the rear wall of the pre-evaporation chamber 12 .
  • the ignition element 11 is arranged in such a way that it projects axially through the rear wall 3 of the combustion chamber arrangement as far as into the combustion chamber 2 .
  • the pre-evaporation chamber is separated from the combustion chamber 2 by a partition wall 13 projecting inwards from the peripheral side wall 21 .
  • the partition wall 13 extends from the side wall 21 radially inwards and axially backwards with regard to the main direction of flow H.
  • the partition wall 13 does not extend over the entire cross-section of the combustion chamber arrangement, but rather a central opening 14 is provided, via which the fuel-air mixture pre-processed in the pre-evaporation chamber 12 may pass from the pre-evaporation chamber 12 into the combustion chamber 2 .
  • the central opening 14 is arranged substantially coaxially with the longitudinal axis Z and has a substantially circular cross-section, but other shapes are in principle also possible.
  • the partition wall 13 may for example be formed of the same material as the side wall 21 , in particular high-temperature resistant steel.
  • the combustion air inlets 8 at which the combustion air exits with a tangential flow component and at least also a radial flow component from the swirl body 6 , are however not arranged in the region of the combustion chamber 2 but rather in the region of the pre-evaporation chamber 12 . Consequently, the combustion air with the tangential flow component is supplied from radially outside to the pre-evaporation chamber 12 .
  • the film evaporator surface 4 is arranged to the rear of the combustion air inlets 8 .
  • the film evaporator burner arrangement 100 again comprises at least one combustion air inlet 8 .
  • the fuel feed 9 supplies the liquid fuel to the rear of the combustion air inlets 8 from radially outside to the film evaporator surface 4 .
  • At least the mouth of the fuel feed 9 is here preferably arranged in such a way that the liquid fuel is introduced with a tangential direction component which corresponds to the direction of swirl of the supplied combustion air.
  • the supplied liquid fuel is distributed at least partially radially at the film evaporator surface 4 to form a fuel film 10 , as shown schematically by dashed lines in FIG. 3 .
  • the partition wall 13 which separates the pre-evaporation chamber 12 from the combustion chamber 2 , heats up such that the fuel film 10 formed at the film evaporator surface 4 is heated and evaporated or volatilized mainly by way of heat radiation.
  • the fuel-air mixture pre-processed in the pre-evaporation chamber 12 passes via the central opening 14 into the combustion chamber 2 , in which it is reacted with release of heat, for example under flaming combustion.
  • the flame stabilizes itself in the combustion chamber 2 . Since the combustion chamber 2 is configured with a substantially free flow cross-section, free of constrictions and contractions, advantageous flow conditions may form in the combustion chamber 2 .
  • heat exchange by way of thermal conduction between the combustion chamber 2 and the pre-evaporation chamber 12 may be minimized, which may be achieved in a technically simple manner for example by suitable selection of materials with low coefficients of thermal conductivity, smaller contact areas and structural barriers.
  • This makes it possible to keep the rear wall 3 at low temperatures during operation of the film evaporator burner arrangement 100 and to heat and volatilize or evaporate the fuel film 10 predominantly by heat radiation.
  • a third embodiment is described below with reference to FIG. 4 .
  • the same reference signs as for the above-described first embodiment are used for the corresponding components of the film evaporator burner arrangement 200 according to the third embodiment.
  • only the differences from the above-described first embodiment will be described in greater detail below.
  • a fourth embodiment is described below with reference to FIG. 5 .
  • the same reference signs as for the above-described embodiments are used for the corresponding components of the film evaporator burner arrangement 300 according to the fourth embodiment. Moreover, only the differences are described in greater detail below.
  • the combustion chamber arrangement comprises not only the combustion chamber 2 but also a pre-evaporation chamber 12 arranged flow-wise upstream thereof for pre-processing the fuel-air mixture prior to entry thereof into the combustion chamber 2 .
  • the rear wall 3 of the combustion chamber arrangement and the film evaporator surface 4 are again arranged not in the combustion chamber 2 but in the pre-evaporation chamber 12 arranged flow-wise upstream thereof, such that the rear wall 3 of the combustion chamber arrangement forms the rear wall of the pre-evaporation chamber 12 .
  • the ignition element 11 is arranged, similarly to in the second embodiment, in such a way that it projects axially from the back into the pre-evaporation chamber 12 .
  • the liquid fuel is supplied via the fuel feed 9 from radially outside to the rear wall 3 comprising the film evaporator surface 4 .
  • the fuel feed opens into the combustion chamber arrangement axially to the rear of the combustion air inlets 8 .
  • the combustion air inlets 8 are here arranged in such a way that the combustion air is supplied with strong swirl from radially outside into the pre-evaporation chamber 12 .
  • the combustion air is supplied with strong swirl to the pre-evaporation chamber 12 , which comprises the film evaporator surface 4 arranged to the rear of the combustion air inlets 8 .
  • the pre-evaporation chamber 12 which comprises the film evaporator surface 4 arranged to the rear of the combustion air inlets 8 .
  • the combustion air is preferably introduced with swirl of such a strength that a swirl number S in the range of 0.4 ⁇ S ⁇ 1.4, preferably 0.5 ⁇ S ⁇ 1.1, is established at the transition from the pre-evaporation chamber 12 to the combustion chamber 2 .
  • a swirl number S in the range of 0.4 ⁇ S ⁇ 1.4, preferably 0.5 ⁇ S ⁇ 1.1
  • pre-processing of the evaporated fuel with combustion air to yield an at least largely pre-mixed fuel-air mixture is achieved in a structurally very simple way, requiring only a little structural space in the axial direction, so resulting in good flow stabilization in the combustion chamber arrangement. In this manner, particularly low-pollutant combustion is achieved in the combustion chamber 2 .
  • the first modification of the fourth embodiment shown in FIG. 6 differs from the fourth embodiment shown in FIG. 5 in that the liquid fuel is not supplied from radially outside to the film evaporator surface 4 but rather in the center of the rear wall 3 in the axial direction.
  • the film evaporator surface 4 axially to the rear of the combustion air inlet 8 and the strong swirl of the supplied combustion air, it is also possible in this case to achieve reliable fuel evaporation and intermixing to yield a fuel-air mixture.
  • the second modification of the fourth embodiment shown in FIG. 7 differs from the fourth embodiment shown in FIG. 5 only in that the fuel feed 9 opens in the axial direction at the rear wall 3 of the pre-evaporation chamber 12 providing the film evaporator surface 4 .
  • the fuel feed 9 opens somewhat to the side of the longitudinal axis Z in the radial direction.
  • the third modification of the fourth embodiment shown in FIG. 8 differs from the second modification merely in the configuration of the transition from pre-evaporation chamber 12 to combustion chamber 2 .
  • FIG. 8 shows, although the flow cross-section at the transition from pre-evaporation chamber 12 to combustion chamber 2 in this case still widens very significantly, it does not do so quite so abruptly as it does in the fourth embodiment and the previously described modifications thereof.
  • an approximately conical widening with a large opening angle is provided.
  • at least a double obtuse opening angle >90° is here provided.
  • the individual structural features may also be combined with one another in different ways. It is for example possible to provide the structural configuration of the transition from pre-evaporation chamber 12 to combustion chamber 2 shown in the third modification also in the fourth embodiment or the first modification of the fourth embodiment.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spray-Type Burners (AREA)
  • Wick-Type Burners And Burners With Porous Materials (AREA)
  • Evaporation-Type Combustion Burners (AREA)
US15/500,306 2014-07-31 2015-07-21 Film evaporator burner arrangement Abandoned US20170211813A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102014110834.5 2014-07-31
DE102014110834.5A DE102014110834A1 (de) 2014-07-31 2014-07-31 Filmverdampfer-Brenneranordnung
PCT/DE2015/100307 WO2016015713A1 (fr) 2014-07-31 2015-07-21 Ensemble formant brûleur et évaporateur de film

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US20170211813A1 true US20170211813A1 (en) 2017-07-27

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US15/500,306 Abandoned US20170211813A1 (en) 2014-07-31 2015-07-21 Film evaporator burner arrangement

Country Status (8)

Country Link
US (1) US20170211813A1 (fr)
EP (1) EP3175175A1 (fr)
JP (1) JP6406426B2 (fr)
KR (1) KR20170033406A (fr)
CN (1) CN106574771A (fr)
DE (1) DE102014110834A1 (fr)
RU (1) RU2656178C1 (fr)
WO (1) WO2016015713A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10330313B2 (en) * 2016-07-11 2019-06-25 Well Traveled Imports INC Twirling flame heater
DE102018111636A1 (de) * 2018-05-15 2019-11-21 Webasto SE Verdampferbaugruppe für mobile Heizgeräte

Citations (5)

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CN106574771A (zh) 2017-04-19
EP3175175A1 (fr) 2017-06-07
KR20170033406A (ko) 2017-03-24
RU2656178C1 (ru) 2018-05-31
JP6406426B2 (ja) 2018-10-17
WO2016015713A1 (fr) 2016-02-04
JP2017524889A (ja) 2017-08-31

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