WO1995009326A1 - Procede et dispositif de combustion de gaz - Google Patents

Procede et dispositif de combustion de gaz Download PDF

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Publication number
WO1995009326A1
WO1995009326A1 PCT/NL1994/000230 NL9400230W WO9509326A1 WO 1995009326 A1 WO1995009326 A1 WO 1995009326A1 NL 9400230 W NL9400230 W NL 9400230W WO 9509326 A1 WO9509326 A1 WO 9509326A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
outlet aperture
burner
mixture
aperture
Prior art date
Application number
PCT/NL1994/000230
Other languages
English (en)
Inventor
Willem Meijer
Original Assignee
Ingenieursburo P.I. Produkt Innovatie B.V.
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
Priority claimed from NL9301675A external-priority patent/NL9301675A/nl
Application filed by Ingenieursburo P.I. Produkt Innovatie B.V. filed Critical Ingenieursburo P.I. Produkt Innovatie B.V.
Publication of WO1995009326A1 publication Critical patent/WO1995009326A1/fr

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
    • F23D14/46—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
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits
    • 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
    • F23D14/74—Preventing flame lift-off

Definitions

  • the invention relates to a method for burning gas by mixing the gas with a quantity of air, causing the gas- air mixture to flow out through an aperture and causing igniting thereof.
  • a method for burning gas by mixing the gas with a quantity of air, causing the gas- air mixture to flow out through an aperture and causing igniting thereof.
  • Such a method is generally known and is frequently applied for instance for heating purposes.
  • a drawback to this known combustion method, called premix burning, is however that during combustion a comparatively large amount of harmful substances, in particular NO ⁇ and CO, are formed. This is caused because it is not easily possible to admix a sufficiently large quantity of air to the combustible gas.
  • the air required for the combustion is normally drawn in by the ejector action of the gas flowing with force out of a feed con ⁇ duit.
  • the amount of air thus drawn in will however generally be only 40-80 percent of the amount required for a so-called stoichiometric combustion, that is, a combustion wherein the products for combustion are brought together precisely in that ratio in which they react fully with each other.
  • stoichiometric combustion that is, a combustion wherein the products for combustion are brought together precisely in that ratio in which they react fully with each other.
  • an overrich gas-air mixture is thus formed which results during combustion in a relatively high flame temperature and therefore the formation of comparatively large quan ⁇ tities of harmful substances.
  • the invention has for its object to provide a method of the above described type wherein the flame tempe ⁇ rature remains relatively low and the formation of harmful substances limited.
  • This is achieved according to the invention in that the mixture flows out at a velocity which is greater than the burning velocity applying for the mixture, further air is added to the mixture after it leaves the outlet aperture and the thus lean mixture is finally burned in flow direction at a distance outside the outlet aperture.
  • Preferably applied variations of the method ac ⁇ cording to the invention are described in the dependent claims 2-5.
  • the invention further relates to a burner suitable for performing the above described method.
  • the burner has at least one mixing chamber with at least one gas feed aperture, at least one air feed aperture, and at least one outlet aperture, in addition to flame stabilizing means arranged at a dis- tance in flow direction outside the outlet aperture.
  • These flame stabilizing means serve to ensure that the gas-air mixture leaving the burner at a velocity greater than the burning velocity applying for that mixture can still burn stably at some distance from the outlet aper- ture. Air can hereby still be added to the outflowing gas-air mixture, for rendering it leaner, after it leaves the outlet aperture and before it reaches the flame stabilizing means.
  • the flame stabilizing means are formed by at least one element disturbing the outflow of the combustible mixture formed in the mixing chamber.
  • the disturbance of the outflow results in a reduction in the velocity of the outflowing gas-air mixture, whereby this eventually decreases to the burning velocity of the lean gas-air mixture, so that this mixture then ignites.
  • the flow-disturbing element can be a bridge spanning the outlet aperture or form part of a grid arranged above the outlet aperture.
  • the flame stabilizing means are formed by (see further claim 13) .
  • the eddying element forms a zone in which the outflo- wing gas-air mixture is caused to eddy and the velocity thereof thus reduced.
  • fig. 1 is a perspective view of a first embodiment of the burner according to the invention
  • fig. 2 is a partly cut away perspective detail view of the burner of fig. 1
  • fig. 3 shows a section along the line III-III of fig. 1 and 2
  • fig. 4 is a perspective view of an alternative burner according to the first embodiment of the inven ⁇ tion
  • fig. 1 is a perspective view of a first embodiment of the burner according to the invention
  • fig. 2 is a partly cut away perspective detail view of the burner of fig. 1
  • fig. 3 shows a section along the line III-III of fig. 1 and 2
  • fig. 4 is a perspective view of an alternative burner according to the first embodiment of the inven ⁇ tion
  • FIG. 5 is a partly sectional perspective detail view of another alternative of the first embodiment of the burner according to the invention
  • fig. 6 is a view corresponding with fig. 5 of yet another variant of the first embodiment of the burner according to the invention
  • fig. 7 is a view corresponding with fig. 5 and 6 of a second embodiment of the burner according to the inven ⁇ tion.
  • a burner 1 (fig. 1) comprises a tubular mixing chamber 2 which is provided with a gas feed aperture 3 which also functions as air feed aperture, and through which gas enters which is blown at great velocity by an ejector 4. Due to the ejector action of the gas, air is entrained into the feed aperture 3 as according to arrows PA through the initially narrowing and subsequently widening jet nozzle 11. The gas G and the air PA are mixed in the chamber 2 and then leave the latter through three parallel slit-like outlet apertures 5. The outflow ⁇ ing gas-air mixture has a higher velocity than the burn- ing velocity applying thereto and does not therefore combust automatically. Flame stabilizing means 6 are therefore arranged in the flow direction at a distance above the outlet apertures 5.
  • These flame stabilizing means 6 are formed in the example shown by the outflow- disturbing elements in the form of bridges 8 spanning the outlet apertures 5 (fig. 2) . Due to these bridges 8 the outflow velocity of the gas-air mixture is locally slowed to such an extent that it falls to the burning velocity applying to the mixture, whereby the mixture ignites, forming substantially reversed conical flames 7. Because the combustion takes place at a distance from the outlet apertures 5, additional air from the vicinity of burner 1 can be drawn in as according to arrows SA between outlet apertures 5 and flame stabilizing means 6, which addi ⁇ tional air renders the gas-air mixture learner such that during combustion thereof a relatively low flame tempera ⁇ ture results and small quantities of harmful substances are therefore formed. Not only the composition of the gas-air mixture with an excess of air but also the shape of the flame, which has a relatively extensive flame front and thus a small specific heat per unit of surface area, plays a part in reducing the flame temperature and the associated emission of harmful substances.
  • the bridges 8 are formed by mutually connected extremities of teeth of comb-like side walls 9 of the outlet apertures 5. This configuration results in a structurally exceptionally simple burner which can be manufactured at small cost. The design of existing burners need only be adapted to a small degree for this purpose.
  • the diameter of the mixing chamber 2 can be smaller than in the case of existing premix burners which operate with an excess of air which is already admixed to the gas in the mixing chamber 2.
  • Such known burners require a relatively large mixing chamber with a rela- tively large feed aperture and thus occupy a relatively large amount of space.
  • these known burners have the problem that the ejector action of the gas flowing into the mixing chamber is insufficient or hardly sufficient to draw in the required large air quantities.
  • the gas In order to increase the ejector action the gas would have to be injected at very great velocity into the mixing chamber, which would then however result in prob- lems relating to the mixing of the gas with the air and the distribution of the mixture over the whole of the outlet aperture(s) .
  • Use is therefore often made in known burners of forced air feed, for instance by means of a fan.
  • the cost of the burner is hereby consider- ably increased, while the space required for installation is also greatly increased.

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 procédé de combustion d'un mélange gaz-air pré-mélangé qui consiste à faire sortir ce mélange à une vitesse supérieure à sa vitesse de combustion, à ajouter davantage d'air (5a) au mélange après qu'il soit sorti de l'ouverture de sortie (5) et à brûler le mélange pauvre ainsi obtenu dans le sens d'écoulement, à une certaine distance à l'extérieur de l'ouverture de sortie. On obtient ainsi, par un procédé simple, une combustion avec une faible température de flamme et un faible dégagement de substances nocives telles que le NOx. Le brûleur (1) de mise en ÷uvre de ce procédé est doté de moyens (6) de stabilisation de flamme disposés dans le sens d'écoulement, à une certaine distance à l'extérieur de l'ouverture (5) de sortie, et peuvent être constitués d'un pont (8) enjambant l'ouverture de sortie (5) ou une grille placée au-dessus de l'ouverture (5) de sortie.
PCT/NL1994/000230 1993-09-28 1994-09-22 Procede et dispositif de combustion de gaz WO1995009326A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL9301675A NL9301675A (nl) 1993-09-28 1993-09-28 Werkwijze en inrichting voor het verbranden van gas.
NL9301675 1993-09-28
NL9301980A NL9301980A (nl) 1993-09-28 1993-11-16 Werkwijze en inrichting voor het verbranden van gas.
NL9301980 1993-11-16

Publications (1)

Publication Number Publication Date
WO1995009326A1 true WO1995009326A1 (fr) 1995-04-06

Family

ID=26647133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1994/000230 WO1995009326A1 (fr) 1993-09-28 1994-09-22 Procede et dispositif de combustion de gaz

Country Status (2)

Country Link
NL (1) NL9301980A (fr)
WO (1) WO1995009326A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5588825A (en) * 1995-12-13 1996-12-31 Governers Of The University Of Alberta Lean premixed fuel burner
JP2014149109A (ja) * 2013-01-31 2014-08-21 Nippon Electric Glass Co Ltd 気体燃料バーナー
CN105299649A (zh) * 2015-12-04 2016-02-03 深圳智慧能源技术有限公司 引射式燃烧装置的蜂窝式进气导流器
ITUB20155086A1 (it) * 2015-11-05 2017-05-05 Aldo Polidoro BRUCIATORE DI GAS COMBUSTIBILE, IN PARTICOLARE PER CALDAIE E SCALDABAGNI, A BASSA EMISSIONE DI NOx E CO
WO2017092040A1 (fr) * 2015-12-04 2017-06-08 深圳智慧能源技术有限公司 Déflecteur cellulaire d'admission d'air d'un dispositif de combustion de type à injection
WO2021051635A1 (fr) * 2019-09-18 2021-03-25 安德森热能科技（苏州）有限责任公司 Brûleur à turbulence de chauffage d'air à faible teneur en azote

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1629964A1 (de) * 1966-11-02 1971-03-11 Saunier Duval Universalbrenner,insbesondere fuer gasbeheizte Haushaltsgeraete
WO1991005206A1 (fr) * 1989-09-30 1991-04-18 Bray Burners Limited Becs a gaz
EP0486169A2 (fr) * 1990-11-16 1992-05-20 American Gas Association Brûleur à faible production de NOx
EP0560454A2 (fr) * 1992-03-12 1993-09-15 Flameco-Eclipse B.V. Brûleur à gaz et installation de chauffage pourvue d'un brûleur à gaz similaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1629964A1 (de) * 1966-11-02 1971-03-11 Saunier Duval Universalbrenner,insbesondere fuer gasbeheizte Haushaltsgeraete
WO1991005206A1 (fr) * 1989-09-30 1991-04-18 Bray Burners Limited Becs a gaz
EP0486169A2 (fr) * 1990-11-16 1992-05-20 American Gas Association Brûleur à faible production de NOx
EP0560454A2 (fr) * 1992-03-12 1993-09-15 Flameco-Eclipse B.V. Brûleur à gaz et installation de chauffage pourvue d'un brûleur à gaz similaire

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5588825A (en) * 1995-12-13 1996-12-31 Governers Of The University Of Alberta Lean premixed fuel burner
JP2014149109A (ja) * 2013-01-31 2014-08-21 Nippon Electric Glass Co Ltd 気体燃料バーナー
ITUB20155086A1 (it) * 2015-11-05 2017-05-05 Aldo Polidoro BRUCIATORE DI GAS COMBUSTIBILE, IN PARTICOLARE PER CALDAIE E SCALDABAGNI, A BASSA EMISSIONE DI NOx E CO
CN105299649A (zh) * 2015-12-04 2016-02-03 深圳智慧能源技术有限公司 引射式燃烧装置的蜂窝式进气导流器
WO2017092040A1 (fr) * 2015-12-04 2017-06-08 深圳智慧能源技术有限公司 Déflecteur cellulaire d'admission d'air d'un dispositif de combustion de type à injection
WO2021051635A1 (fr) * 2019-09-18 2021-03-25 安德森热能科技（苏州）有限责任公司 Brûleur à turbulence de chauffage d'air à faible teneur en azote
US12066184B2 (en) 2019-09-18 2024-08-20 Anderson Thermal Solutions (Suzhou) Co., Ltd. Low-NOx air heating swirl burner

Also Published As

Publication number Publication date
NL9301980A (nl) 1995-04-18

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