EP4295082A1 - Procédé pour faire fonctionner un brûleur à gaz - Google Patents

Procédé pour faire fonctionner un brûleur à gaz

Info

Publication number
EP4295082A1
EP4295082A1 EP22708295.5A EP22708295A EP4295082A1 EP 4295082 A1 EP4295082 A1 EP 4295082A1 EP 22708295 A EP22708295 A EP 22708295A EP 4295082 A1 EP4295082 A1 EP 4295082A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
outlet opening
gas
burner
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.)
Pending
Application number
EP22708295.5A
Other languages
German (de)
English (en)
Inventor
Manfred Dzubiella
Eugen Gleim
Konrad Ritter
Ralf BRÄMER
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.)
Viessmann Climate Solutions SE
Original Assignee
Viessmann Climate Solutions SE
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 Viessmann Climate Solutions SE filed Critical Viessmann Climate Solutions SE
Publication of EP4295082A1 publication Critical patent/EP4295082A1/fr
Pending 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • 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
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • 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
    • 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
    • F23D14/82—Preventing flashback or blowback
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/40—Inducing local whirls around flame
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/9901—Combustion process using hydrogen, hydrogen peroxide water or brown gas as fuel
    • 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
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14241—Post-mixing with swirling means

Definitions

  • the invention relates to a method for operating a gas burner according to the preamble of patent claim 1.
  • a method of the type mentioned at the beginning is generally known, so that no special printed proof is required in this regard.
  • a mixture is formed from a fuel gas and air in a mixture chamber. Furthermore, the mixture is conveyed at a regulated conveying rate through an outlet opening on a burner surface delimiting the mixture space. Furthermore, the mixture is burned on the burner surface with the formation of a recirculation vortex. Finally, exhaust gas that forms during combustion is brought into contact with a fluid-cooled heat exchanger that is arranged at a distance from the outlet opening. This process has proven to be very effective for the combustion of natural gas (i.e. gas mixtures containing hydrocarbons). 20
  • the object of the invention is to improve a method of the type mentioned at the outset.
  • a method for operating a gas burner is to be made available with which non-carbon, ie carbon-free, gases, in particular hydrogen, can also be burned.
  • the method according to the invention is characterized in that the recirculation vortex is deliberately brought up to the heat exchanger, and in particular in complete contrast (which will be discussed in more detail below) to natural gas combustion to cool, which in turn means that the gas recirculated to the burner surface can cool it (i.e. the burner surface).
  • the gas recirculated to the burner surface can cool it (i.e. the burner surface).
  • a carbon-free gas as the fuel gas more precisely hydrogen, have shown, this is very helpful in order to prevent the gas-air mixture in the mixture chamber from igniting, i.e. a flashback, when using a carbon-free gas as the fuel gas - in spite of the high burner modulation - can safely rule out 20.
  • delivery rate used above is, which also results from claim 1, to be understood as “delivery rate per outlet opening”, since it is ultimately important to regulate the exit pulse of the mixture from the outlet opening, since this the length of the recirculation vortex is determined as the product of mass flow and velocity. It goes without saying that the burner surface regularly has a large number of outlet openings and, according to the invention, a total delivery rate for all outlet openings must be regulated accordingly. If the method according to the invention were used for the above-mentioned combustion of natural gas, the combustion would be interrupted prematurely and carbon monoxide emissions would be unacceptably high. 5
  • FIG. 1 schematically shows a gas burner with a recirculation vortex reaching up to the heat exchanger
  • FIG. 2 shows a three-dimensional representation, generated by computer simulation, of a recirculation vortex reaching up to the heat exchanger 25;
  • FIG. 3 shows a three-dimensional representation, generated by computer simulation, of a recirculation vortex that does not reach as far as the heat exchanger
  • Figure 4 is a diagram showing four different recirculation rates versus the relative distance between the outlet opening and the heat exchanger is plotted.
  • FIG. 5 is a diagram showing four different average temperatures of the exhaust gas recirculation plotted against the relative distance between the outlet opening and the heat exchanger.
  • Figures 1 to 5 serve to explain the method according to the invention for operating a gas burner in which (see in particular Figure 1) a mixture is formed in a mixture chamber 1 from a 10 fuel gas and air, in which the mixture is fed at a controlled delivery rate by a outlet opening 2 on a burner surface 3 delimiting the mixture chamber 1, in which the mixture is burned on the burner surface 3 with the formation of a recirculation vortex and 15 in the exhaust gas formed during combustion with a fluid-cooled heat exchanger 4 arranged at a distance from the outlet opening 2 in contact is made.
  • one outlet opening 20 is always to be understood in the sense of “at least one outlet opening”, with a total delivery rate for all existing outlet openings obviously being regulated if there are several outlet openings.
  • the conveying rate for the mixture and the distance between the outlet opening 2 and the heat exchanger 4 are selected in such a way that the recirculation vortex extends from the outlet opening 2 to the heat exchanger 4 and that this is cooled at the heat exchanger 4 becomes.
  • a length of the recirculation vortex is set according to a distance between the burner surface 3 and the heat exchanger 4 on the basis of a size of the outlet opening 2 and the delivery rate.
  • the recirculation vortex (at least viewed somewhat abstractly) is generated with a vortex space enclosed by an outer boundary surface.
  • a longitudinal extent of the recirculation vortex (between the burner surface 3 and the heat exchanger 4) is approximated such that an end of the boundary surface of the recirculation vortex facing away from the outlet opening just touches the heat exchanger 4.
  • Figures 1 and 2 show on the other hand, a situation in which the boundary surface of the vortex space does not reach the heat exchanger 4 .
  • the burner surface 3 in particular the outlet opening 2 is heated to a reduced extent compared to exhaust gas that is recirculated but not cooled at the heat exchanger 4 .
  • the burner surface 3 is ultimately heated less by the exhaust gas cooled at the heat exchanger 4 than by exhaust gas that is recirculated but not cooled at the heat exchanger, with the said requirement being particularly ultimately and advantageously results in lower nitrogen oxide values in the exhaust gas.
  • a gas burner is used in which the outlet openings 2 are located at a maximum distance of 30 to 100 mm from the heat exchanger 4 in relation to their shortest possible distance from the latter.
  • a burner surface 3 designed in the shape of a cylinder jacket and/or a heat exchanger 4 designed in the shape of a cylinder jacket are/will be used. Also in figures 2 1 and 3, which show corresponding cylinder segments, it is assumed that the burner surface 3 and the heat exchanger 4 are designed accordingly.
  • a carbon-free gas is used as the combustible gas. More precisely, it is preferably provided that a gas containing at least a proportion of hydrogen is used as the fuel gas. Provision is very particularly preferably made for (practically pure) hydrogen to be used as the fuel gas.
  • the recirculation rate R results from the ratio of the mass flow actually recirculated to the mass flow at the outlet opening 2.
  • the recirculation rate R is accordingly a dimensionless variable.
  • the relative distance A is also dimensionless, with the burner surface 3 corresponding to the value 0 and the heat exchanger 4 to the value 100.
  • the curves 25 1 to 3 show curves in which the recirculation vortex does not reach the heat exchanger 4 in each case. In contrast, this is the case with the fourth curve (solid line).
  • the average temperature T (in °C) of the recirculated exhaust gas is plotted against the dimensionless distance A for the same four situations.
  • the temperature of the exhaust gas (curves 1 to 3) that does not reach the heat exchanger 4 is about 1600°C. If, on the other hand, the recirculation vortex reaches the heat exchanger 4 through appropriate adjustment of the delivery rate (with a given size of the outlet opening 2 and a given distance between the burner surface 3 and the heat exchanger 4), the exhaust gas at the heat exchanger 4 can cool down by around 600°C. which in turn has the consequence that the gas burner can be operated well, in particular with hydrogen, and specifically with a high burner modulation

Landscapes

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

Abstract

L'invention concerne un procédé pour faire fonctionner un brûleur à gaz, selon lequel un mélange est formé à partir d'un gaz de combustion et d'air dans une chambre de mélange (1), le mélange est amené avec un débit réglé au niveau d'une surface de brûleur (3) délimitant la chambre de combustion (1), en passant à travers un orifice de sortie (2), le mélange est brûlé au niveau de la surface de brûleur (3) en formant un tourbillon de recirculation, et le gaz brûlé se formant lors de la combustion est mis en contact avec un échangeur de chaleur (4) refroidi par fluide, placé à une certaine distance de l'orifice de sortie (2). Selon l'invention, le débit d'amenée du mélange et la distance entre l'orifice de sortie (2) et l'échangeur de chaleur (4) sont choisis de telle sorte que le tourbillon de recirculation s'étend depuis l'orifice de sortie (2) jusqu'à l'échangeur de chaleur (4) et est refroidi au niveau de l'échangeur de chaleur (4).
EP22708295.5A 2021-02-18 2022-02-10 Procédé pour faire fonctionner un brûleur à gaz Pending EP4295082A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021103800.6A DE102021103800A1 (de) 2021-02-18 2021-02-18 Verfahren zum Betrieb eines Gasbrenners
PCT/DE2022/100113 WO2022174864A1 (fr) 2021-02-18 2022-02-10 Procédé pour faire fonctionner un brûleur à gaz

Publications (1)

Publication Number Publication Date
EP4295082A1 true EP4295082A1 (fr) 2023-12-27

Family

ID=80682265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22708295.5A Pending EP4295082A1 (fr) 2021-02-18 2022-02-10 Procédé pour faire fonctionner un brûleur à gaz

Country Status (3)

Country Link
EP (1) EP4295082A1 (fr)
DE (1) DE102021103800A1 (fr)
WO (1) WO2022174864A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9101668A (nl) * 1991-10-03 1993-05-03 Fasto Nefit Bv Branderplaat en brander voor een gasmengsel met een hoge luchtfactor.
NL9400280A (nl) * 1994-02-23 1995-10-02 Stichting Energie Werkwijze voor de verbranding van hoogreaktieve gasvormige lucht/brandstof-mengsels en branderinrichting voor het uitvoeren van deze werkwijze.
DE102007036953B3 (de) 2007-08-04 2009-04-02 Deutsches Zentrum für Luft- und Raumfahrt e.V. Brenner
WO2011113400A1 (fr) 2010-03-19 2011-09-22 Technische Universität Berlin Procédé et système de réglage ou de commande du comportement en service d'une installation d'incinération à turbine à gaz
DE102017120370B4 (de) 2017-09-05 2019-06-06 Deutsches Zentrum für Luft- und Raumfahrt e.V. Brennerkopf, Brennersystem und Verfahren zum Betreiben des Brennersystems
EP3467383B1 (fr) 2017-10-06 2021-02-17 ERK Eckrohrkessel GmbH Installation de chaudière et procédé de génération de chaleur par combustion d'au moins un combustible

Also Published As

Publication number Publication date
DE102021103800A1 (de) 2022-08-18
WO2022174864A1 (fr) 2022-08-25

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