EP0917633A1 - Bruleur a gaz - Google Patents

Bruleur a gaz

Info

Publication number
EP0917633A1
EP0917633A1 EP98933432A EP98933432A EP0917633A1 EP 0917633 A1 EP0917633 A1 EP 0917633A1 EP 98933432 A EP98933432 A EP 98933432A EP 98933432 A EP98933432 A EP 98933432A EP 0917633 A1 EP0917633 A1 EP 0917633A1
Authority
EP
European Patent Office
Prior art keywords
gas
fuel
gas burner
burner according
air mixture
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.)
Withdrawn
Application number
EP98933432A
Other languages
German (de)
English (en)
Inventor
Walter Daniel
Marcus Bienzle
Walter Lehr
Walter Sarholz
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 EP0917633A1 publication Critical patent/EP0917633A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F23D14/16—Radiant burners using permeable blocks
    • 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
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/10—Baffles or deflectors formed as tubes, e.g. in water-tube boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/106—Assemblies of different layers

Definitions

  • the invention relates to a gas burner with a housing which has a combustion chamber with an inlet for a gas or a gas-air mixture and an outlet for the exhaust gas, wherein at least one fuel element made of porous material is arranged in the combustion chamber, within which the gas Air mixture is combustible, the fuel element being subdivided into at least two partial fuel elements, and the cooling element being associated with a cooling device.
  • Such a gas burner is described in WO 95/01 532.
  • a barrel-shaped housing is provided, which is filled with a fuel body.
  • the fuel element is made of a porous material.
  • the pore size increases in the direction of flow of the gas-air mixture from the inlet to the outlet of the exhaust gas.
  • a cooling circuit with two heat sinks is provided to dissipate the heat generated during combustion.
  • One heat sink dissipates the heat from the outside of the housing.
  • the second heat sink is set in the porous material.
  • a narrow flame front stabilizes itself transversely to the direction of flow of the gas-air mixture within the porous material.
  • a large amount of heat is generated in this flame front with a correspondingly high proportion of nitrogen oxides. Where the flame front meets the approximated by the heat sink tempered zones, carbon monoxide will be formed. Due to the high temperature peaks in the flame front, the performance of the gas burner is limited depending on the material used for the burner.
  • DE 195 27 583 C2 shows a gas burner which has a housing. o
  • the housing has a cylindrical main part, in which a flame holder consisting of a wire mesh is housed.
  • the actual burner body connects to the flame holder. This is also made from a wire mesh.
  • the fuel gas consisting of a gas-air mixture flows through the flame holder and is ignited in the fuel element.
  • the waste heat generated during combustion can be dissipated in heat exchangers.
  • the main part of the housing is surrounded by a jacket in which a pipeline is embedded. A coolant circulates in the pipeline.
  • Such gas burners are used to generate high outputs. Surface loads of up to 3000 kW / m 2 can arise in the fuel element.
  • This object of the invention is achieved in that the broad body, at least in the area of heat generation, on the side facing the cooling device forms a partial fuel body which has a lower flow resistance than the partial fuel body facing away from the cooling device.
  • the object of the invention is also achieved with a gas burner, in which 5 it is provided that the heat exchangers are thermally decoupled from the fuel body at least in the region of the combustion zone only via an insulating air gap.
  • the heat exchanger spacing according to the invention also achieves effective heat extraction from the combustion body by means of radiation processes. A high output can thus be generated in the fuel body.
  • a heat exchanger is arranged in the area facing the inlet of the housing in the flow direction in front of the fuel element and is thermally decoupled from the fuel element via an insulating air gap.
  • a possible variant of the invention is characterized in that the fuel body has a plurality of fuel elements which are arranged next to one another transversely to the flow direction, an insulating gap being left between the fuel elements. It has been shown that with such a segmentation of the burner, there is less pollutant emission than with continuous burner bodies.
  • the fuel element is placed on a plate which is formed from a multiplicity of parallel lamellae and which is arranged facing the inlet of the housing, then disruptive acoustic resonances can be prevented which arise, for example, in the case of gas burners which Use flat burner plates with perforated structures. It is preferably provided that the plate has lamellae which have a different extension in the flow direction.
  • a possible variant of the invention is characterized in that the cooling device is formed by a heat exchanger which exchanges the heat generated in the exhaust gas flow in the region above the fuel body, and in that the fuel element facing the heat exchanger has a channel structure and the fuel element facing away from the heat exchanger is a channel structure has stoichometric pore distribution.
  • a very low flow resistance can be generated in the channel structure.
  • the stoichometric pore distribution can then be generated if a bed of temperature-resistant bodies or, for example, a temperature-resistant foam-like material or braid is used for the partial fuel body.
  • the fuel body is bordered laterally by heat sinks of the cooling device at right angles to the flow direction of the gas or the gas-air mixture. This simple measure effectively allows a large heat output to be dissipated from the fuel element. If it is provided here that the heat sinks protrude beyond the combustion elements in the direction of the flow of the gas-air mixture, the temperature of the burnout path can be kept at a desired temperature level. 5
  • the fuel elements are placed on a distributor in which the gas-air mixture is supplied to the fuel element via channels.
  • the distributor ensures an even distribution of the fuel gas-air mixture in front of the burner.
  • the defender can also have a cooled plate on which the fuel elements stand.
  • the plate has through openings through which the gas-air mixture flows to the fuel element.
  • the distributor must have a thickness greater than 2 mm.
  • the free cross section of the channels in the distributor should not be less than 6 mm 2 . Effective cooling of the plate also prevents the flames from kicking back.
  • a heat exchanger is inserted into the fluid flow in the direction of the flow in front of the fuel element.
  • a possible gas burner according to the invention is characterized in that the partial fuel body facing the cooling device is formed by a lamellar block on which the partial fuel body with the higher flow resistance is placed.
  • the lamellar block can be constructed like a finned heat exchanger, which is water-cooled, for example.
  • the lamellae seen in the direction of flow, carry the or the partial fuel element at their outlet edges.
  • the trailing edges as well as the trailing edges can be smooth or structured.
  • the lamella block it is also conceivable for the lamella block to have chambers between its lamellae, which are at least partially filled with a porous fill.
  • the porous bed can be used to evenly distribute the gas
  • Air mixture can be used.
  • Fills made of metallic or ceramic bodies, foam-like materials, braids or knitted fabrics made of wire or honeycomb bodies made of ceramic, metal or metal-ceramic composite materials can be used for the fuel body. These materials have a sufficiently high temperature resistance for the required application. If it is provided that the cooling device is thermally decoupled from the combustion body in the region of the combustion zone via an insulating air gap, then there is no direct cooling contact with the combustion body. Accordingly, no areas with a large temperature gradient can arise. This reliably prevents a low temperature range in which carbon monoxide would arise.
  • the insulating gap advantageously has a width of 1 to 10 cm.
  • an ignition device can be provided in the interior of the combustion body.
  • FIG. 1 shows a schematic representation of a gas burner with a combustion body and heat exchangers in side view and in section
  • FIG. 2 shows a schematic representation of a gas burner with a plurality of burners and heat sinks arranged in between, in a side view and in section,
  • FIG. 5 in side view and in section a schematic
  • FIG. 6 and FIG. 7 segmented fuel elements for the gas burner according to FIG. 4.
  • Figure 1 shows a housing 22 of a gas burner.
  • a combustion body 14 is accommodated in the interior of the housing 22 in a combustion chamber.
  • the fuel element 14 consists of two partial fuel elements 14.1, 14.2.
  • the partial fuel body 14.1 has a stoichiometric pore distribution in its interior. In this sense, for example, a ceramic foam or a bed of ceramic or metallic bodies can be used for the partial fuel body 14.1.
  • Partial burner 14.1 mounted on top partial burner 14.2 is traversed by a channel structure 17.
  • the channel structure 17 there is a lower flow resistance in the partial fuel element 14.2 than in the partial fuel element 14.1.
  • the entire fuel element 14 is placed on an upper side 12.1 of a plate 12.
  • the plate 12 is kept at a predeterminable temperature level with cooling, not shown in the drawing.
  • Through openings 1 3 are provided in the contact zone of the plate 1 2 with the fuel body 14.
  • the channels 1 1, the passage openings 1 3, the pores in the porous material 1 5 and the channel structure 17 of the partial fuel body 14.2 are spatially connected to one another.
  • a gas-air mixture can thus penetrate into the distributor 10 and reach the partial fuel element 1 4.2.
  • a heat exchanger 20 is installed in the housing 22 5 above the partial fuel body 14.2. The heat exchanger 20 is traversed by a pipeline system 21 in which water or another liquid with a high heat storage capacity is guided.
  • the gas-air mixture flows through the distributor 10 o and the passage openings 13 of the plate 12 into the fuel body 14. Here it ignites. Since there is now a high flow resistance in the partial fuel body 14.1, a relatively small proportion of the gas-air mixture is burned. The remaining gas-air mixture flows to the partial fuel body 1 .2. In this it is implemented with great heat development. Since the partial i5 burner 14.2 now faces the heat exchanger 20, the developed high
  • a heat exchanger 20 with a piping system 21 is also arranged below the distributor 10. This heat exchanger 20 also absorbs the heat given off downwards.
  • cooling elements 23 of a cooling device are attached to the top 12.2 of the plate 12 on both sides of the fuel element 14.
  • the heat sinks 23 are arranged at a distance from the fuel bodies 14 30, so that an air gap 25> 10 mm is formed.
  • the heat sinks 23 protrude beyond the fuel elements 14 in the direction of the flow of the gas-air mixture.
  • a cooling line 24 is present in the projecting part.
  • the fuel elements 14 are subdivided into individual fuel elements 14.1, 14.2 transversely to the direction of flow of the gas-air mixture.
  • the flow resistance decreases from the interior of the fuel body 14 to the sides that face the cooling devices 23.
  • a three-part stratification is conceivable, the two outer partial fuel elements having a small and the inner partial fuel element having a large flow resistance.
  • additional partial fuel elements can also form intermediate stages.
  • Gas-air mixture conversion in the fuel body 14 also creates zones of different heat development.
  • the maximum heat development will arise in the areas facing the heat sinks 23. Here it can be removed effectively, so that a uniform temperature distribution in the fuel body 14 is produced.
  • the thermal energy is drawn off from the cooling devices 23 via the insulating air gap 25.
  • the heat exchange takes place solely through radiation.
  • an upper and a lower heat exchanger 20 are also present here, which exchange the residual heat generated.
  • a water-carrying cooling line is used as the cooling body 23.
  • a fin block is slid onto this cooling line.
  • the lamella block consists of individual lamellae 27.1 arranged parallel to one another, between which chambers 27.2 are formed.
  • the lamella block forms, as a further 5 partial fuel elements 14.2, together with the partial fuel elements 14.1, the fuel element 14.
  • the chambers 27.2 formed between the blades 27.1 can be filled with a porous material.
  • the porous material fulfills the function of evenly distributing the gas-air mixture. At the same time, it must create a zone of high heat development o above the heat sink 23 as a partial fuel body 14.2.
  • FIG. 4 shows a gas burner which has a segmented burner 14 and is composed of individual partial burner 14.n.
  • the partial fuel elements 14n are arranged adjacent to one another transversely to the direction of flow of the fuel gas. To improve the heat transfer device, the partial fuel elements 14n are separated from one another via a gap S.
  • the partial fuel elements 14.n are placed on the top 12.1 of a plate 12. The fuel gas is fed to the fuel body 14 through passage openings 1 3 of the plate 1 2. 6 and 7 result in different geometries which can be used as partial fuel elements 14.n.
  • Fig. 6 shows rectangular, Fig. 7 hexagonal partial fuel elements 14.n.
  • a large number of other partial fuel elements are also conceivable, for example square or polygonal ones. 5
  • FIG. 5 shows a gas burner in which a fuel element 14 is placed on a plate 12.
  • the plate 1 2 prevents a flashback. It is formed from a multiplicity of lamellae which are parallel to one another transversely to the direction of flow.
  • the passage openings 1 3 0 are formed between the slats.
  • the lamellae are of different lengths, so that one part of the lamellae carries the fuel element 14, another part but is at a distance from this.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

L'invention concerne un brûleur à gaz pourvu d'une enveloppe (22) comportant une chambre de combustion dotée d'un orifice d'admission pour un gaz ou un mélange gaz-air et d'un orifice de sortie pour le gaz brûlé. Dans cette chambre de combustion est disposée au moins un corps de combustion (14) en matériau poreux, à l'intérieur duquel le mélange gaz-air peut être brûlé, ce corps de combustion étant subdivisé en au moins deux corps de combustion partiels (14.1, 14.2), et un dispositif de refroidissement étant adjoint à ce corps de combustion. On obtient un rendement élevé avec simultanément de faibles rejets de substances polluantes si le corps de combustion forme, au moins dans la région de la production de chaleur sur le côté faisant face au dispositif de refroidissement, un corps de combustion partiel (14.2) présentant une résistance à l'écoulement plus faible que le corps de combustion partiel (14.1) opposé au dispositif de refroidissement.
EP98933432A 1997-05-03 1998-05-02 Bruleur a gaz Withdrawn EP0917633A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1997118885 DE19718885C2 (de) 1997-05-03 1997-05-03 Gasbrenner
DE19718885 1997-05-03
PCT/DE1998/001217 WO1998050733A1 (fr) 1997-05-03 1998-05-02 Bruleur a gaz

Publications (1)

Publication Number Publication Date
EP0917633A1 true EP0917633A1 (fr) 1999-05-26

Family

ID=7828634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98933432A Withdrawn EP0917633A1 (fr) 1997-05-03 1998-05-02 Bruleur a gaz

Country Status (4)

Country Link
EP (1) EP0917633A1 (fr)
JP (1) JP2000514916A (fr)
DE (1) DE19718885C2 (fr)
WO (1) WO1998050733A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10000652C2 (de) * 2000-01-11 2002-06-20 Bosch Gmbh Robert Brenner mit einem katalytisch aktiven porösen Körper
DE10032190C2 (de) * 2000-07-01 2002-07-11 Bosch Gmbh Robert Gasbrenner mit einem Brennkörper aus porösem Material
DE10115644C2 (de) * 2000-12-12 2003-01-09 Bosch Gmbh Robert Gasbrenner mit einem Brennkörper aus porösem Material
DE10213132B4 (de) * 2002-03-23 2005-06-02 Robert Bosch Gmbh Gasbrenner
WO2011147654A1 (fr) * 2010-05-25 2011-12-01 Solaronics S.A. Élément de brûleur présentant des différences locales de propriétés physiques

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643667A (en) * 1985-11-21 1987-02-17 Institute Of Gas Technology Non-catalytic porous-phase combustor
US4889481A (en) * 1988-08-16 1989-12-26 Hi-Tech Ceramics, Inc. Dual structure infrared surface combustion burner
EP0410569A1 (fr) * 1989-06-16 1991-01-30 Devron-Hercules Inc. Brûleur à gaz à rayonnement infrarouge
WO1992016795A1 (fr) * 1991-03-15 1992-10-01 Radian Corporation Appareil et procede permettant la combustion a l'interieur d'elements matriciels poreux
BE1005992A4 (nl) * 1992-06-10 1994-04-12 Bekaert Sa Nv Poreus membraan voor oppervlakte stralingsbrander.
DE4322109C2 (de) * 1993-07-02 2001-02-22 Franz Durst Brenner für ein Gas/Luft-Gemisch
DE4445460A1 (de) * 1994-12-20 1996-06-27 Bosch Gmbh Robert Gasbrenner für Heizgeräte, insbesondere Wassererhitzer
DE19527583C2 (de) * 1995-07-28 1998-01-29 Max Rhodius Gmbh Brenner, insbesondere für Heizungsanlagen
DE19544417A1 (de) * 1995-11-29 1997-06-05 Bernhard Dipl Ing Dahm Katalytischer Brenner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9850733A1 *

Also Published As

Publication number Publication date
DE19718885A1 (de) 1998-11-19
DE19718885C2 (de) 2003-10-09
JP2000514916A (ja) 2000-11-07
WO1998050733A1 (fr) 1998-11-12

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