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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01B—BOILING; BOILING APPARATUS ; EVAPORATION; EVAPORATION APPARATUS
  • B01B1/00—Boiling; Boiling apparatus for physical or chemical purposes ; Evaporation in general
  • B01B1/005—Evaporation for physical or chemical purposes; Evaporation apparatus therefor, e.g. evaporation of liquids for gas phase reactions
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
  • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
  • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
  • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
  • F01N3/0256—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases the fuel being ignited by electrical means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2207/00—Ignition devices associated with burner
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2213/00—Burner manufacture specifications

Definitions

• the invention relates to an evaporator burner with a combustion chamber for a heater or a thermal regeneration of an exhaust gas particle filter, with a circumferential boundary wall, an end boundary wall which has a central opening, an air supply connection piece which has a radial circumferential flange and projects coaxially into the combustion chamber, which has radial air exits through the nozzle wall and which is upstream of an air guiding device for a swirl flow air supply, and with a lateral ignition device and a fuel supply.
• an evaporator burner of the aforementioned type which has a central air supply connection which is provided with slots on the circumference and has a through opening which can also be closed.
• the fuel is supplied via a candle socket attached to the outer jacket or via an annular channel on the combustion chamber floor.
• the supplied fuel is distributed over a porous lining attached to the inside of the circumferential boundary wall by capillary action in the axial and tangential direction, evaporated and burned in the area of the slots.
• the lining usually has an axial extension to the end of the air supply nozzle.
• a disadvantage of the aforementioned known embodiment of an evaporator burner is the positional dependence of the fuel distribution due to gravity and the relatively high cost of materials with regard to the porous lining. Since the combustion chamber is completely covered with the porous material dressed and therefore exposed to a large part of the combustion, the porous material is subject to high wear. Furthermore, the lateral receiving socket or candle socket is integrated into the circumferential boundary wall of the combustion chamber in a comparatively complicated manner and provided with an additional sieve, which means another component with connection problems to the combustion chamber.
• the invention is therefore characterized in that the air guiding device, the air supply nozzle and the end boundary wall are an integral investment casting component in such a way that the radial end boundary wall of the combustion chamber and the air supply nozzle together with the radial peripheral flange form an ignition pocket with a radial pilot air hole form, wherein the lateral ignition device is at least partially arranged in the ignition pocket and porous evaporator material is provided in the form of a ring in the combustion chamber floor area.
• the air guide device preferably has a radially outer guide vane ring, with a closed end wall in front, which is placed on the guide vane ring as a disk.
• a particularly favorable air routing geometry with a minimized blower back pressure results if, in an advantageous further development of the invention, the aforementioned closed end wall has a centrally symmetrical, essentially conical indentation and the air supply nozzle on its axial end inside the combustion chamber has a closed further end wall with a further, centrally symmetrical conical indentation, which opposes the first-mentioned indentation is.
• the circumferential boundary wall of the combustion chamber is expediently designed as a cylindrical sheet-metal flame tube.
• a sheet-shaped cover arranged downstream of the air supply nozzle can be accommodated in the flame tube.
• the ring-shaped porous evaporator material is in particular a multilayer lining on the combustion chamber floor (possibly with different densities for controlling the fuel distribution), which is arranged downstream of the ignition device, or alternatively a multilayer web with a cutout for the ignition device, with a metal felt between the combustion chamber floor and the web. Layer can be inserted.
• the porous evaporator material can also be an annular ceramic plate.
• the ignition device is preferably a glow plug or glow plug which is at least partially positively received in the ignition pocket (18).
• the lateral ignition device can advantageously be located tangentially to the radial peripheral flange of the air supply connector.
• the lateral ignition device is arranged at an angle of inclination of preferably approximately 4 ° to 10 ° with respect to the combustion chamber base or the plane of the radial peripheral flange of the air supply connector.
• the fuel is fed to the ring-shaped porous evaporator material via the combustion chamber base or alternatively via the igniter socket or the igniter pocket.
• an ignition pocket with a radial ignition air hole is provided between the combustion chamber base and the air guiding device.
• this ignition pocket there is the ignition device (glow plug or similar), which is followed by the ring-shaped lining in a design variant in the direction of the combustion chamber.
• the ignition pocket is tangent to the air supply nozzle.
• the location of the fuel entry is important for the positional independence and the ignition. Since this location cannot be independent of the ignition device and the force of gravity, the combustion chamber floor area is selected according to the invention, where the ring-shaped porous evaporator material is located, which requires relatively little ring area or little material for the distribution and evaporation of the fuel and is manufactured at low cost can.
• vaporizer burner In the vaporizer burner according to the invention, small masses of material are used in the area of the vaporizer and the combustion chamber and the location of the flame, so that there are no unnecessarily long heating times until the process runs stably. As a certain minimum wall thickness is absolutely necessary depending on the design due to the casting technique parts that cause this constraint must be reduced. This is possible if the lining of the combustion chamber wall is laid on the floor and the combustion chamber jacket no longer has to be cast.
• the combustion chamber jacket is eliminated. It is replaced by the extension of the flame tube.
• the evaporator fleece is built up in multiple layers, possibly with different densities, and / or as a ceramic plate.
• a metal felt layer is additionally inserted between the combustion chamber base and the multilayered web, which compensates for the different surface roughness and thus enables an optimal transfer of the fuel.
• the stratification and the thickness are determined by experiment.
• the candle socket is provided tangentially but on the inner jacket of the combustion chamber.
• the glow plug or the like protrudes tangentially into the combustion chamber in the area near the wall.
• the combustion chamber floor is also lined with a ring-shaped web package, which is about 3mm to 6mm high and surrounds the glow plug. So that the glow pencil sits in a web pocket.
• the fuel is supplied either through the combustion chamber floor or through the candle socket.
• FIG. 1 shows an evaporator burner in a schematic axial section with a central air supply nozzle and an upstream air guiding device
• FIG. 3 shows another embodiment variant of an evaporator burner in a schematic axial section similar to FIG. 1, and
• FIG. 4 shows the evaporator burner according to FIG. 3 in cross section along the line A-A of FIG. 3.
• the evaporator burner shown in FIG. 1 for a heater or for thermal regeneration of an exhaust gas particle filter comprises a combustion chamber 1 with a circumferential boundary wall 2 and an end boundary wall 3.
• the end boundary wall 3 has a central opening, through which a central air guide stub 5 projects into the combustion chamber 1.
• the air supply nozzle has in its cylindrical nozzle wall in the combustion chamber 1 radial air outlets 6 in the form of longitudinal slots and a closed end End wall 15.
• An air space is formed in the combustion chamber 1 by the air supply nozzle 5, in which a porous evaporator material 11 in the form of a multi-layer lining is provided on the combustion chamber bottom side at the level of the end boundary wall 3.
• the multi-layer lining in particular a multi-layer evaporator fleece or spun, which or which can also be preceded by a metal felt layer 20, is supplied with fuel from a fuel supply 9 on the side during operation.
• the fuel is evenly distributed in the annular evaporator material, evaporated on the inside of the combustion chamber of the evaporator material and burned there with air supply in the annular space of the combustion chamber.
• the air supply connection 5 is provided with a radial peripheral flange 4, which is arranged at a distance from the end boundary wall 3 of the combustion chamber and forms an ignition pocket 18, which will be described below.
• An air guiding device 7 with a radially outer guide vane ring for a swirl flow air supply is arranged in front of the air supply nozzle 5, the guide vane ring being covered by a separate, closed end wall.
• the air guiding device 7 or the guide vane ring, the air supply connection 5 and the end boundary wall 3 are in particular designed as a one-piece investment casting component. det, the radial end boundary wall 3 of the combustion chamber 1 and the nozzle area 10 of the air supply nozzle 5 not projecting into the combustion chamber, together with the radial peripheral flange 4, forms the aforementioned ignition pocket 18 with a radial ignition air bore 19, and a lateral ignition device 8 in the form of a glow plug or a glow plug is at least partially arranged in the ignition pocket.
• the ignition pocket is tangential to the air supply connector.
• the air supply nozzle 5 and the air guiding device 7 can be constructed so as to be air-permeable.
• the closed end wall 13 of the air guiding device 7 can have a centrally symmetrical, essentially conical indentation 14 and the air supply connector 5 at its axial end inside the combustion chamber can have a closed end wall 15 with a further centrally symmetrical conical indentation 16, which is opposite to the first mentioned indentation 14.
• the candle socket is tangential, but on the inner surface of the combustion chamber.
• the glow plug or glow plug protrudes tangentially into the combustion chamber itself in the region near the wall, and is therefore not upstream of the combustion chamber 1, as is the case with the first-mentioned embodiment variant according to FIG. 1.
• the combustion chamber floor is here advanced up to the radial peripheral flange 4 of the air supply connection and is also lined with an annular porous evaporator material in the form of a web package which is about 3 mm to 6 mm high or thick and surrounds the glow plug or glow plug. So that the glow plug or glow plug sits in a fabric pocket.
• the fuel will be which is supplied via the combustion chamber floor or via the fuel feed 9 via the candle socket according to FIGS. 3 and 4.
• the ignition device 8 (glow plug, glow plug) can be accommodated in the ignition pocket 18 or the plug socket.
• the lateral ignition device 8 is at an angle of inclination x of approximately 4 ° to 10 ° with respect to the combustion chamber base or the plane of the radial peripheral flange 4 of the air supply nozzle 5.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Wick-Type Burners And Burners With Porous Materials (AREA)
• Spray-Type Burners (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7827766

Family Applications (1)

Country Status (3)

Cited By (4)

Families Citing this family (17)

Citations (2)

Family Cites Families (2)

• 1997
  • 1997-04-25 DE DE19717544A patent/DE19717544A1/de not_active Withdrawn
• 1998
  • 1998-04-01 CZ CZ19993763A patent/CZ291682B6/cs not_active IP Right Cessation
  • 1998-04-01 WO PCT/DE1998/000948 patent/WO1998049494A1/de active IP Right Grant
  • 1998-04-01 DE DE19880561T patent/DE19880561B4/de not_active Expired - Fee Related

Patent Citations (2)

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