EP1731836A1 - Premix gas burner - Google Patents

Premix gas burner Download PDF

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Publication number
EP1731836A1
EP1731836A1 EP06011335A EP06011335A EP1731836A1 EP 1731836 A1 EP1731836 A1 EP 1731836A1 EP 06011335 A EP06011335 A EP 06011335A EP 06011335 A EP06011335 A EP 06011335A EP 1731836 A1 EP1731836 A1 EP 1731836A1
Authority
EP
European Patent Office
Prior art keywords
gas
cylinder
air mixture
cylinders
filler
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Withdrawn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
EP06011335A
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German (de)
French (fr)
Inventor
Heinrich Oehler
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 EP1731836A1 publication Critical patent/EP1731836A1/en
Withdrawn legal-status Critical Current

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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
    • F23D14/46—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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/101—Flame diffusing means characterised by surface shape
    • F23D2203/1012—Flame diffusing means characterised by surface shape tubular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/102—Flame diffusing means using perforated plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/104—Grids, e.g. honeycomb grids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/105—Porous plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/10—Burner material specifications ceramic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/20—Burner material specifications metallic

Definitions

  • the invention relates to a premixing gas burner with a cylindrical fuel assembly according to the preamble of claim 1.
  • a gas burner of this kind is in the DE 38 31 624 A1 shown and described.
  • the cylindrical fuel element is exposed to very high temperatures, since the flames are close to the surface.
  • this outer cylinder which serves as a burner surface and therefore has a very fine perforation, further cylinders are arranged for uniform distribution of the gas / air mixture on the surface and for acoustic decoupling of combustion chamber and mixture space.
  • These serve as throttling and distribution cylinders are concentric with the outer cylinder, usually have slightly larger flow openings for the gas / air mixture than the outer cylinder and are fastened together with this on the upstream end element.
  • the disclosure DE 42 29 070 A1 a gas burner with a bottom perforated and open-topped chamber which is filled with spherical elements. Through their gaps, the gas / air mixture flows through and burns above the ball bed or in the interstices.
  • a burner surface as in a generic premixing gas burner, is not present.
  • the invention is therefore based on the object of optimizing the quality of combustion and the robustness, especially with regard to the material load on the burner surface, in the case of a premixing gas burner.
  • the premixing gas burner is characterized in that between two cylinders a permeable to the gas / air mixture, temperature-resistant filler is introduced.
  • the filler is located between two cylinders below the outer, serving as a burner surface cylinder, and in particular in the space to the nearest inner cylinder as a distribution cylinder.
  • the filler consists of particulate fillers, granules or chips, preferably of metallic or ceramic materials.
  • the lumpy packing, granules or chips each have at least slightly larger dimensions than a single flow opening for the gas / air mixture in the inner, serving as a distribution cylinder cylinder.
  • the filler can also consist of a fine-meshed fabric, which is wound in at least one position around the inner cylinder as a distribution cylinder.
  • This structure becomes very irregular and delicate, especially in the case of several layers and fine meshes.
  • the filler at least in the intermediate space below the outer, serving as a burner surface cylinder is introduced.
  • the drawing illustrates an embodiment of the invention and shows in a single figure a cross section through the cylindrical fuel assembly of a premixing gas burner.
  • the cylindrical fuel assembly consists of two concentrically arranged cylinders 1, 2, which are provided with flow openings 3 for the gas / air mixture.
  • the inner cylinder 1 serves as a distribution cylinder and the outer cylinder 2 as a burner surface.
  • temperature-resistant filler 4 With the most diffuse, finely distributed flow of the gas / air mixture is generated before reaching the burner surface.

Landscapes

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

Abstract

The burner has a cylindrical fuel assembly which consists of inner and outer cylinders (1, 2) that are arranged concentrically to each other and provided with perfusion openings (3) for gas and air mixture. The cylinders are firmly supported at a common front side unit that includes an inflow opening, where the inner cylinder serves as dispensing cylinder and the outer cylinder serves as burner surface. A filler material (4) is inserted between the cylinders, where the filler material is temperature-resistant and permeable for the gas and air mixture.

Description

Die Erfindung betrifft einen vormischenden Gasbrenner mit einem zylindrischen Brennelement nach dem Oberbegriff des Patentanspruches 1.
Ein Gasbrenner dieser Art ist in der DE 38 31 624 A1 dargestellt und beschrieben. Bei einem solchen Gasbrenner ist das zylindrische Brennelement sehr hohen Temperaturen ausgesetzt, da sich die Flammen dicht an der Oberfläche befinden. Innerhalb dieses äußeren Zylinders, welcher als Brenneroberfläche dient und daher eine sehr feine Perforation aufweist, sind zur gleichmäßigen Verteilung des Gas-/Luft-Gemisches an der Oberfläche und zur akustischen Entkopplung von Brennraum und Gemischraum weitere Zylinder angeordnet. Diese dienen als Drossel- und Verteilzylinder, liegen konzentrisch zum äußeren Zylinder, besitzen meistens etwas größere Durchströmöffnungen für das Gas-/Luft-Gemisch als der äußere Zylinder und sind gemeinsam mit diesem am einströmseitigen Stirnelement befestigt.
Wegen der hohen Temperaturen ist es bei den bekannten Gasbrenner-Ausführungen möglich, dass das insbesondere metallische Material des äußeren Zylinders durch Grenzspannungen zu hoch belastet wird und dass dadurch eventuell lokale Schäden auftreten. Begründet ist dies mit dem Aufbau des zylindrischen Brennelementes, denn die jeweiligen Bereiche über den punktuellen Durchströmöffnungen für das Gas-/Luft-Gemisch im inneren Zylinder bilden sich auf dem äußeren Zylinder als kühle Flecken ab, weil hier das Gas-/Luft-Gemisch direkt auf die Innenwand des äußeren Zylinders trifft. Die intensive, punktuelle Kühlung sowie die dadurch ungleichmäßige Temperaturverteilung führen daher zu Wärmespannungen. Möglich sind auch negative Auswirkungen auf das Flammenbild, nämlich dass strömungsbedingt ebenfalls eine etwas ungleichmäßige Flammenform am Umfang des Brennelementes entsteht.
Weiterhin offenbart die DE 42 29 070 A1 einen Gasbrenner mit einer unten perforierten und oben offenen Kammer, welche mit kugelförmigen Elementen gefüllt ist. Durch deren Lücken fließt das Gas-/Luft-Gemisch hindurch und verbrennt oberhalb der Kugelschüttung oder in den Zwischenräumen. Eine Brenneroberfläche, wie bei einem gattungsgemäßen vormischenden Gasbrenner, ist dabei allerdings nicht vorhanden.The invention relates to a premixing gas burner with a cylindrical fuel assembly according to the preamble of claim 1.
A gas burner of this kind is in the DE 38 31 624 A1 shown and described. In such a gas burner, the cylindrical fuel element is exposed to very high temperatures, since the flames are close to the surface. Within this outer cylinder, which serves as a burner surface and therefore has a very fine perforation, further cylinders are arranged for uniform distribution of the gas / air mixture on the surface and for acoustic decoupling of combustion chamber and mixture space. These serve as throttling and distribution cylinders, are concentric with the outer cylinder, usually have slightly larger flow openings for the gas / air mixture than the outer cylinder and are fastened together with this on the upstream end element.
Because of the high temperatures, it is possible in the known gas burner designs that the particular metallic material of the outer cylinder is loaded too high by limiting stresses and that this may cause local damage. This is due to the structure of the cylindrical fuel element, because the respective areas above the punctiform flow openings for the gas / air mixture in the inner cylinder form on the outer cylinder as cool spots, because here the gas / air mixture directly meets the inner wall of the outer cylinder. The intensive, selective cooling and the resulting uneven temperature distribution therefore lead to thermal stresses. It is also possible negative effects on the flame image, namely that due to flow also creates a somewhat uneven flame shape at the periphery of the fuel assembly.
Furthermore, the disclosure DE 42 29 070 A1 a gas burner with a bottom perforated and open-topped chamber which is filled with spherical elements. Through their gaps, the gas / air mixture flows through and burns above the ball bed or in the interstices. However, a burner surface, as in a generic premixing gas burner, is not present.

Der Erfindung liegt daher die Aufgabe zugrunde, bei einem vormischenden Gasbrenner die Verbrennungsqualität und die Robustheit, besonders im Hinblick auf die Materialbelastung an der Brenneroberfläche, zu optimieren.The invention is therefore based on the object of optimizing the quality of combustion and the robustness, especially with regard to the material load on the burner surface, in the case of a premixing gas burner.

Erfindungsgemäß wurde dies mit den Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Weiterbildungen sind den Unteransprüchen zu entnehmen.
Der vormischende Gasbrenner ist dadurch gekennzeichnet, dass zwischen zwei Zylindern ein für das Gas-/Luft-Gemisch durchlässiger, temperaturbeständiger Füllstoff eingebracht ist. Dabei befindet sich der Füllstoff zwischen zwei Zylindern unterhalb des äußeren, als Brenneroberfläche dienenden Zylinders, und insbesondere im Zwischenraum zum nächstgelegenen inneren Zylinder als Verteilzylinder.
Der Füllstoff besteht aus stückigen Füllkörpern, Granulat oder Spänen, vorzugsweise aus metallischen oder keramischen Werkstoffen. Die stückigen Füllkörper, das Granulat oder die Späne besitzen jeweils mindestens etwas größere Abmessungen als eine einzelne Durchströmöffnung für das Gas-/Luft-Gemisch im inneren, als Verteilzylinder dienenden Zylinder. Alternativ oder in Kombination damit kann der Füllstoff auch aus einem feinmaschigen Gewebe bestehen, welches in mindestens einer Lage um den inneren Zylinder als Verteilzylinder gewickelt ist. Diese Struktur wird besonders bei mehreren Lagen und feinen Maschen sehr unregelmäßig und feingliedrig. Vorteilhaft ist es, wenn der Füllstoff, mindestens im Zwischenraum unterhalb des äußeren, als Brenneroberfläche dienenden Zylinders eingebracht ist.
Mit den erfindungsgemäßen Maßnahmen werden bei vormischenden Gasbrennern mit einem zylindrischen Brennelement sowohl die Verbrennungsqualität und als auch die Robustheit verbessert. Insbesondere die Materialbelastung an der Brenneroberfläche vermindert sich, weil erfindungsgemäß eine sehr gleichmäßige Temperaturverteilung an der Brenneroberfläche entsteht. Durch den zwischen zwei Zylindern eingebrachten Füllstoff, besonders wenn er sich unterhalb der Brenneroberfläche befindet, wird eine möglichst diffuse, fein verteilte Strömung des Gas-/Luft-Gemisches am Außenmantel des Brennelementes erzeugt. Das bisher problematische direkte Durchströmen von innen nach außen, das Aufprallen auf die Innenwand des äußeren Zylinders und die dadurch verursachte punktuelle Kühlung der Brenneroberfläche mit den daraus resultierenden Wärmespannungen, treten nicht mehr auf. Außerdem lässt sich der Füllstoff in den beschriebenen Variationen sehr einfach bei der Herstellung eines zylindrischen Brennelementes einbringen. Generell ist die Gemischverteilung beim Einsatz eines Füllstoffes zwischen zwei Zylindern so gleichmäßig, dass in der Regel auf weitere Zylinder zur Gemischverteilung oder Drosselung verzichtet werden kann.This has been achieved with the features of claim 1 according to the invention. Advantageous developments can be found in the dependent claims.
The premixing gas burner is characterized in that between two cylinders a permeable to the gas / air mixture, temperature-resistant filler is introduced. In this case, the filler is located between two cylinders below the outer, serving as a burner surface cylinder, and in particular in the space to the nearest inner cylinder as a distribution cylinder.
The filler consists of particulate fillers, granules or chips, preferably of metallic or ceramic materials. The lumpy packing, granules or chips each have at least slightly larger dimensions than a single flow opening for the gas / air mixture in the inner, serving as a distribution cylinder cylinder. Alternatively or in combination therewith, the filler can also consist of a fine-meshed fabric, which is wound in at least one position around the inner cylinder as a distribution cylinder. This structure becomes very irregular and delicate, especially in the case of several layers and fine meshes. It is advantageous if the filler, at least in the intermediate space below the outer, serving as a burner surface cylinder is introduced.
With the measures according to the invention, both the combustion quality and the robustness are improved in premixing gas burners with a cylindrical fuel element. In particular, the material load on the burner surface is reduced because, according to the invention, a very uniform temperature distribution is produced at the burner surface. By introduced between two cylinders filler, especially if it is located below the burner surface, a diffuse, finely distributed flow of the gas / air mixture is generated on the outer jacket of the fuel assembly. The previously problematic direct flow from the inside to the outside, the impact on the inner wall of the outer cylinder and the resulting selective cooling of the burner surface with the resulting thermal stresses, do not occur anymore. In addition, the filler in the described variations can very easily bring in the production of a cylindrical fuel assembly. In general, the mixture distribution when using a filler between two cylinders is so uniform that can usually be dispensed with further cylinder for mixture distribution or throttling.

Die Zeichnung stellt ein Ausführungsbeispiel der Erfindung dar und zeigt in einer einzigen Figur einen Querschnitt durch das zylindrische Brennelement eines vormischenden Gasbrenners.The drawing illustrates an embodiment of the invention and shows in a single figure a cross section through the cylindrical fuel assembly of a premixing gas burner.

Das zylindrische Brennelement besteht aus zwei konzentrisch zueinander angeordneten Zylindern 1, 2, welche mit Durchströmöffnungen 3 für das Gas-/Luft-Gemisch versehenen sind. Dabei dient der innere Zylinder 1 als Verteilzylinder und der äußere Zylinder 2 als Brenneroberfläche. Zwischen den beiden Zylindern 1, 2 befindet sich ein für das Gas-/Luft-Gemisch durchlässiger, temperaturbeständiger Füllstoff 4, mit dem eine möglichst diffuse, fein verteilte Strömung des Gas-/Luft-Gemisches vor dem Erreichen der Brenneroberfläche erzeugt wird.The cylindrical fuel assembly consists of two concentrically arranged cylinders 1, 2, which are provided with flow openings 3 for the gas / air mixture. In this case, the inner cylinder 1 serves as a distribution cylinder and the outer cylinder 2 as a burner surface. Between the two cylinders 1, 2 there is a permeable to the gas / air mixture, temperature-resistant filler 4, with the most diffuse, finely distributed flow of the gas / air mixture is generated before reaching the burner surface.

Claims (5)

Vormischender Gasbrenner mit einem zylindrischen Brennelement, das aus mindestens zwei konzentrisch zueinander angeordneten, mit Durchströmöffnungen für das Gas-/Luft-Gemisch versehenen Zylindern (1, 2) besteht, die an einem gemeinsamen, eine Einströmöffnung für das Gas-/Luft-Gemisch aufweisenden Stirnelement fest gelagert sind, wobei ein innerer Zylinder (1) als Verteilzylinder und ein äußerer Zylinder (2) als Brenneroberfläche dient,
dadurch gekennzeichnet, dass zwischen zwei Zylindern (1, 2) ein für das Gas-/Luft-Gemisch durchlässiger, temperaturbeständiger Füllstoff (4) eingebracht ist.Premixing gas burner with a cylindrical fuel element, which consists of at least two concentrically arranged, provided with flow openings for the gas / air mixture cylinders (1, 2), which at a common, having an inlet opening for the gas / air mixture Are fixedly mounted end element, wherein an inner cylinder (1) serves as a distribution cylinder and an outer cylinder (2) as a burner surface,
characterized in that between two cylinders (1, 2) for the gas / air mixture permeable, temperature-resistant filler (4) is introduced. Gasbrenner nach Anspruch 1,
dadurch gekennzeichnet, dass der Füllstoff (4) zwischen zwei Zylindern (1, 2) unterhalb des äußeren Zylinders (2) als Brenneroberfläche, und insbesondere im Zwischenraum zum nächstgelegenen inneren Zylinder (1) als Verteilzylinder, angebracht ist.Gas burner according to claim 1,
characterized in that the filler (4) between two cylinders (1, 2) below the outer cylinder (2) as a burner surface, and in particular in the space to the nearest inner cylinder (1) as a distribution cylinder attached. Gasbrenner nach den Ansprüchen 1 oder 2,
dadurch gekennzeichnet, dass der Füllstoff (4) aus stückigen Füllkörpern, Granulat oder Spänen besteht, wobei diese jeweils mindestens etwas größere Abmessungen als eine Durchströmöffnung (3) für das Gas-/Luft-Gemisch im inneren Zylinder (1) als Verteilzylinder besitzen.Gas burner according to claims 1 or 2,
characterized in that the filler (4) consists of lumpy packing, granules or chips, each having at least slightly larger dimensions than a flow-through opening (3) for the gas / air mixture in the inner cylinder (1) as a distribution cylinder. Gasbrenner nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der Füllstoff (4) aus einem feinmaschigen Gewebe besteht, welches in mindestens einer Lage um den inneren Zylinder (1) als Verteilzylinder gewickelt ist.Gas burner according to one of claims 1 to 3,
characterized in that the filler (4) consists of a fine-meshed fabric, which is wound in at least one position around the inner cylinder (1) as a distribution cylinder. Gasbrenner nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass mit dem zwischen zwei Zylindern (1, 2) eingebrachten Füllstoff (4), mindestens unterhalb des äußeren Zylinders (2) als Brenneroberfläche, eine möglichst diffuse Strömung des Gas-/Luft-Gemisches erzeugt wird.Gas burner according to one of claims 1 to 4,
characterized in that with the introduced between two cylinders (1, 2) filler (4), at least below the outer cylinder (2) as the burner surface, a diffuse flow as possible of the gas / air mixture is generated.
EP06011335A 2005-06-08 2006-06-01 Premix gas burner Withdrawn EP1731836A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510026299 DE102005026299A1 (en) 2005-06-08 2005-06-08 Premixing gas burner

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EP1731836A1 true EP1731836A1 (en) 2006-12-13

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EP06011335A Withdrawn EP1731836A1 (en) 2005-06-08 2006-06-01 Premix gas burner

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DE (1) DE102005026299A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016206247A1 (en) * 2016-04-14 2017-11-02 Gvp Gesellschaft Zur Vermarktung Der Porenbrennertechnik Mbh surface burner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006155A1 (en) * 1985-04-08 1986-10-23 Miura Co., Ltd. Surface combustion type fluid heater
EP0530630A1 (en) * 1991-09-06 1993-03-10 BUDERUS HEIZTECHNIK GmbH Gas burner
EP0542074A2 (en) * 1991-11-11 1993-05-19 Lüdi, Roger Flame holder for radiant burner
EP0892213A1 (en) * 1997-07-16 1999-01-20 Gianmario Invernizzi A filtering-bed burner and a gas combustion method carried out by it

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6607199U (en) * 1968-06-06 1971-01-21 Fargas Spa BURNERS FOR GAS FUELS
DE3831624A1 (en) * 1987-09-26 1989-04-06 Ruhrgas Ag Gas burner
IT1251560B (en) * 1991-09-06 1995-05-17 Nuovopignone Ind Meccaniche Ef PERFECTED BURNER, PARTICULARLY SUITABLE FOR WALL BOILERS

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006155A1 (en) * 1985-04-08 1986-10-23 Miura Co., Ltd. Surface combustion type fluid heater
EP0530630A1 (en) * 1991-09-06 1993-03-10 BUDERUS HEIZTECHNIK GmbH Gas burner
EP0542074A2 (en) * 1991-11-11 1993-05-19 Lüdi, Roger Flame holder for radiant burner
EP0892213A1 (en) * 1997-07-16 1999-01-20 Gianmario Invernizzi A filtering-bed burner and a gas combustion method carried out by it

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