EP0796412A1 - Bruleur pour dispositifs de chauffage, notamment pour chauffe-eau - Google Patents

Bruleur pour dispositifs de chauffage, notamment pour chauffe-eau

Info

Publication number
EP0796412A1
EP0796412A1 EP95936980A EP95936980A EP0796412A1 EP 0796412 A1 EP0796412 A1 EP 0796412A1 EP 95936980 A EP95936980 A EP 95936980A EP 95936980 A EP95936980 A EP 95936980A EP 0796412 A1 EP0796412 A1 EP 0796412A1
Authority
EP
European Patent Office
Prior art keywords
burner
plate
combustion chamber
channels
burner plate
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
EP95936980A
Other languages
German (de)
English (en)
Other versions
EP0796412B1 (fr
Inventor
Walter Daniel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0796412A1 publication Critical patent/EP0796412A1/fr
Application granted granted Critical
Publication of EP0796412B1 publication Critical patent/EP0796412B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/18—Radiant burners using catalysis for flameless combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/78—Cooling burner parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/108—Flame diffusing means with stacked sheets or strips forming the outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities

Definitions

  • the invention is based on gas burners according to the preamble of the main claim.
  • gas burners of this type EP 0 404 260 AI
  • the channels in the burner plate are formed between individual plate elements, the edge edges of which on the combustion chamber side all lie in a common exit plane.
  • the flame roots only touch the burner plate with theirs
  • Flame temperature should not rise to a range that is harmful with respect to NO x formation.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage, that the flames are cooled in their root area over a defined area extending beyond the apex area so that even higher surface loads of the burner or the burner plate are possible without resulting in impermissibly high NO x values.
  • burner plate is constructed from sheet metal fins which are connected to one another by a cooling pipe system through which the heat-dissipating medium flows and which delimit the channels or gaps between them for the passage of the fuel-air mixture.
  • the pronounced structuring of the burner plate can be achieved in that a set-back or shortened sheet-metal rib is provided between two sheet metal ribs that are not set back.
  • an embodiment has been found to be particularly advantageous in which two shorter sheet metal ribs are arranged side by side between two sheet metal ribs that are not set back.
  • care must be taken that they have a width or a diameter that is smaller than the so-called extinguishing distance at least over a longitudinal section, so that the flames cannot fight back.
  • a perforated plate or a lattice structure is provided on the inflow side of the burner plate, the opening diameter or the mesh size of which is smaller than the rib spacing.
  • the burner plate can consist of a honeycomb structure and a base plate connected to it, which is connected to the heat-dissipating pipe system and is provided with inflow bores opening into the channels of the honeycomb structure.
  • the formation of harmful NO x emissions can be further counteracted if the walls of the channels for the fuel-air mixture flowing through are catalytically coated at least in the region of their end sections on the combustion chamber side.
  • the burner plate must be designed by appropriate dimensioning or material selection so that the surface temperature is approximately 600 ° C.
  • Such a catalytic burner is started in a conventional manner with the Rib or honeycomb ends of free-burning flames. After the burner plate has been heated to the operating temperature of the catalyst coating, the flames withdraw into the catalytically active region.
  • the pipe system which is connected in a heat-conducting manner to the burner plate can advantageously have water flowing through it and the pipe system with the burner plate can form a heat exchanger unit of the water heater.
  • a heat exchanger acted upon by the combustion gases of the gas burner can be made smaller than in an embodiment with an uncooled burner.
  • FIG. 1 shows a water heater with a gas burner according to the first exemplary embodiment
  • FIG. 2 enlarges the burner plate of the gas burner according to FIG. 1
  • FIGS. 3 and 4 each show a modification of the burner plate according to FIG. 2.
  • FIGS. 5 and 6 the burner plates according to FIG second and third embodiment shown.
  • FIG. 7 shows a top view of the burner plate according to FIG. 6.
  • the water heater according to FIG. 1 has a gas burner 12 in a housing 10, to which a fuel-air mixture is fed under blower pressure in the direction of arrow A. Downstream of the gas burner 12, an exhaust gas heat exchanger 14 is seated in the housing 10 and is penetrated by a pipe system 16 which carries the water to be heated. The pipe system 16 is connected via a line 18 to a second one Connected pipe system 20 which is integrated in the gas burner 12. An ignition device 22 for starting the heater is attached to the housing 10 downstream of the gas burner 12.
  • the gas burner 12 has a burner plate 24 which is constructed from sheet metal fins 26, 28 of different lengths (FIG. 2).
  • the sheet metal fins 26, 28 are in good heat-conducting contact with the pipe system 20 and are connected by this to form a rigid structural unit. Between the sheet metal ribs 26, 28 there are gaps 30 for the passage of the
  • the width a of the column 30 is smaller than the so-called extinguishing distance, so that flames cannot strike back into the burner plate 24 or into a possibly mixing zone located in front of it.
  • the burner plate 24 is designed so that the shorter sheet metal ribs 28 are each between two longer sheet metal ribs 26.
  • the arrangement is such that the edges 32 of the shorter sheet metal ribs 28 on the combustion chamber side are set back relative to the edges 34 of the longer sheet metal ribs 26. This results in a strongly stepped surface structuring on the combustion chamber side wall of the burner plate 24 with wide gaps 36 which are laterally delimited by wall regions 38 of the longer sheet metal ribs 26.
  • the mixture reacts between or at the downstream edges 32, 34 of the sheet metal fins 26, 28 to form flames, whereby
  • the modified embodiment according to FIG. 3 is a burner plate 40, in which two shortened sheet metal ribs 28 are arranged between the longer sheet metal ribs 26. This results in even wider spaces 42, which structure the wall of the burner plate 40 on the combustion chamber side particularly strongly.
  • a burner plate 44 is made of sheet metal ribs of different lengths
  • the burner plate 44 is provided with a lattice structure 50, the mesh size of which is smaller than the width of the gap between the sheet metal ribs 46, 48.
  • the thermal conductivity of the sheet metal fins 46, 48 is matched to the burner output by dimensioning and / or choice of material in such a way that its surface temperature is set at, for example, 600 ° C.
  • a catalytic combustion takes place on the sheet metal fins 46, 48, in which the formation of pollutants is further reduced compared to an uncoated version.
  • the burner is started in a conventional manner with a flame burning freely at the ends of the sheet metal fins 46, 48 on the combustion chamber side. After the sheet metal fins 46, 48 have been heated to the operating temperature of the catalyst coating, the flame withdraws into the catalytically active region of the burner plate 44.
  • a burner plate 52 is equipped with pins 54, 56 of unequal length, which form channels 58 between them for the passage of the fuel-air mixture and wider spaces 60 on the combustion chamber side for extensive contact with the flame roots.
  • Pins 54, 56 are on one Fixed base plate 62, which is provided with narrow inlet bores 64 for the fuel-air mixture and at the same time produces a heat-conducting connection to a water-carrying pipe system 66 which extends, for example, in a meandering manner over the surface of the base plate 62.
  • a burner plate 68 consists of the base plate 62 connected to the pipe system 66 and a honeycomb structure 70 attached to it. This is formed from hexagonal, non-gaping individual honeycombs 72, into the cavities of which the inflow holes 64 of the base plate 62 open. For greater structuring of the wall of the burner plate 68 on the combustion chamber side, as shown in FIGS.
  • the cavities of the individual honeycombs 72 or a part of the individual honeycombs 72 can be narrowed by shorter, preferably also honeycomb-shaped inserts 74 fastened to the base plate 62 than the individual honeycombs 72 are designed and cause a gradation of the wall of the burner plate on the combustion chamber side.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Gas Burners (AREA)

Abstract

L'invention concerne un brûleur à gaz pour dispositifs de chauffage, qui comprend une plaque comportant une pluralité de canaux pour le passage du mélange combustible-air acheminé sous la pression d'une soufflante et qui réagit dans la zone des orifices situés côté chambre de combustion, de manière à former une flamme. Il est prévu que la paroi de la plaque du brûleur (24, 40, 44, 52, 68), située côté chambre de combustion, soit structurée de manière étagée, de sorte à former des surfaces de contact (38) définies, entre la base des flammes situées au niveau de la plaque du brûleur et le bords (32, 34) des orifices des canaux (30, 58), ces surfaces s'étendant sur les zones de crête de la base des flammes, ainsi que contre ou dans leurs zones latérales. Il en résulte un bon refroidissement de la flamme, ce qui permet une sollicitation élevée de la surface du brûleur, tout en respectant une valeur-seuil prédéfinie de NOx.
EP95936980A 1994-12-20 1995-11-24 Bruleur pour dispositifs de chauffage, notamment pour chauffe-eau Expired - Lifetime EP0796412B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4445460A DE4445460A1 (de) 1994-12-20 1994-12-20 Gasbrenner für Heizgeräte, insbesondere Wassererhitzer
DE4445460 1994-12-20
PCT/DE1995/001663 WO1996019698A1 (fr) 1994-12-20 1995-11-24 Bruleur pour dispositifs de chauffage, notamment pour chauffe-eau

Publications (2)

Publication Number Publication Date
EP0796412A1 true EP0796412A1 (fr) 1997-09-24
EP0796412B1 EP0796412B1 (fr) 2001-06-20

Family

ID=6536379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95936980A Expired - Lifetime EP0796412B1 (fr) 1994-12-20 1995-11-24 Bruleur pour dispositifs de chauffage, notamment pour chauffe-eau

Country Status (8)

Country Link
EP (1) EP0796412B1 (fr)
JP (1) JPH10510912A (fr)
KR (1) KR980700540A (fr)
CN (1) CN1171150A (fr)
CZ (1) CZ189897A3 (fr)
DE (2) DE4445460A1 (fr)
RU (1) RU2150637C1 (fr)
WO (1) WO1996019698A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29611338U1 (de) * 1996-06-18 1997-10-16 Robert Bosch Gmbh, 70469 Stuttgart Gasbrenner für Heizgeräte
DE19641040A1 (de) * 1996-10-04 1998-04-23 Bosch Gmbh Robert Atmosphärischer Gasbrenner
DE19718885C2 (de) * 1997-05-03 2003-10-09 Bosch Gmbh Robert Gasbrenner
DE19722863A1 (de) * 1997-05-31 1998-12-03 Bosch Gmbh Robert Gasbrenner für Heizgeräte, insbesondere Wassererhitzer
DE10213132B4 (de) * 2002-03-23 2005-06-02 Robert Bosch Gmbh Gasbrenner
US9976740B2 (en) * 2012-06-12 2018-05-22 Board of Regents of the Nevada Systems of Higher Educations, on Behalf of the University of Nevada, Reno Burner
KR101359551B1 (ko) * 2012-08-16 2014-02-12 주식회사 경동나비엔 냉각장치를 구비한 예혼합 버너
CN107532820B (zh) * 2015-06-30 2020-05-12 环球油品公司 用于火焰工艺加热器的膜温度优化器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137905A (en) * 1972-04-17 1979-02-06 T. I. Domestic Appliances Limited Gaseous fuel burners
IT1205556B (it) * 1986-08-29 1989-03-23 Polidoro Aldo Testa di bruciatore di gas ottenuta mediante una lamiera punzonata
GB2223838B (en) * 1988-09-22 1992-07-22 Padley Dr Peter Joseph Boiler system
NL8901559A (nl) * 1989-06-21 1991-01-16 Nefit Nv Verwarmingsinrichting.
AT396017B (de) * 1990-08-01 1993-05-25 Vaillant Gmbh Brenner
NL9200282A (nl) * 1991-12-16 1993-07-16 Dejatech Bv Brander, al dan niet geintegreerd in een warmtewisselaar.
FR2714151B1 (fr) * 1993-12-22 1996-02-02 Gaz De France Dispositif d'accrochage de flammes et d'échange de chaleur, brûleur et chauffe-fluide ainsi équipés .

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9619698A1 *

Also Published As

Publication number Publication date
RU2150637C1 (ru) 2000-06-10
EP0796412B1 (fr) 2001-06-20
DE59509357D1 (de) 2001-07-26
CN1171150A (zh) 1998-01-21
CZ189897A3 (en) 1997-10-15
JPH10510912A (ja) 1998-10-20
WO1996019698A1 (fr) 1996-06-27
KR980700540A (ko) 1998-03-30
DE4445460A1 (de) 1996-06-27

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