EP2534421A2 - Gas forced air burner having modulatable burner power and method for operating a gas forced air burner - Google Patents
Gas forced air burner having modulatable burner power and method for operating a gas forced air burnerInfo
- Publication number
- EP2534421A2 EP2534421A2 EP10787464A EP10787464A EP2534421A2 EP 2534421 A2 EP2534421 A2 EP 2534421A2 EP 10787464 A EP10787464 A EP 10787464A EP 10787464 A EP10787464 A EP 10787464A EP 2534421 A2 EP2534421 A2 EP 2534421A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- burner
- gas
- air
- distribution space
- fuel gas
- 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
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
- F23D14/34—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
- F23D23/00—Assemblies of two or more burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
-
- 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
- F23D2900/00017—Assembled burner modules
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/10—High or low fire
Definitions
- the invention relates to a gas blower burner with modulable burner power for a gas heater according to the preamble of claim 1, a method for operating a gas blower burner according to the preambles of claim 10 and a gas heater according to claim 14.
- Gas fan burners with modulable burner performance are well known. They are usually used to heat a heating fluid such as heating water or drinking water in a gas heater. In this case, combustion air is supplied to the burner via an air path and fuel gas via a gas path. The amount of air required for heating a Schufluidstroms is conveyed in accordance with the predetermined burner capacity or the predetermined Schufluidtemperatur means of a variable speed air blower in the air. The amount of gas corresponding to this amount of air is metered in the gas path with the aid of a gas valve. Air and fuel gas mix to a fuel gas-air mixture. For the complete and low-emission combustion of the fuel gas, among other factors, a specific target composition of the fuel gas-air mixture is necessary.
- the aim is an excess of air (air ratio) ⁇ ⁇ ⁇ _ ⁇ _ ⁇ 1, 3 compared to the required for complete oxidation of the fuel stoichiometric minimum air requirement.
- a so-called pneumatic gas air composite causes this mixture composition.
- An air flow meter arranged in the air measures the amount of the delivered amount of combustion air and gives an actuating signal to the gas valve, which releases a fuel gas amount corresponding to the desired composition of the fuel gas-air mixture.
- the fuel gas-air mixture passes through a burner surface, which has the function of a flame holder in a combustion chamber, is ignited here by means of an igniter and burns with the release of heat.
- the heat of combustion is transferred in a heat exchanger to the heating fluid and this supplied to the use.
- a Venturi nozzle is usually used because of the low pressure loss.
- a pneumatic gas control valve There is a quadratic relationship between the flow rate variation and the differential pressure signal.
- Known devices for mixing fuel gas and air of the aforementioned type are capable of realizing throughput variations in a range of about 1: 5 (corresponding to a pressure variation of about 1:25), since the available pressure range on the one hand by the blower and on the other hand is limited by the required minimum response pressure of the pneumatic control valve.
- the limitation of the range variation range is accompanied by a similar limitation of the burner power range of a burner and the Schutsch.modulations Kunststoffs a gas heater.
- Modern gas heaters with correspondingly modern gas-jet burners have a comparatively low air ratio of ⁇ 1.3 compared to previously customary burners.
- the water vapor dew point temperature of an exhaust gas depends on the air ratio of the combustion: As the air ratio decreases, the dew point temperature rises. This results in a potential problem in the operation of modern gas heaters, namely the condensation of moisture contained in the exhaust gas to the cool combustion chamber walls and the cool surfaces of heat exchanger and exhaust pipe. This condensation is only allowed (and desirable) on condensing boilers since the components are designed accordingly. For conventional calorifiers, condensation must be avoided, otherwise moisture affected components could corrode and fail. A tendency to condensation is also favored by the device heating power or temperature. On surfaces of high temperature (high heat output) either no moisture precipitates or it can dry quickly. At low surface temperatures (low heat output), the dew point temperature tends to fall below and there is precipitation of moisture.
- thermoacoustic resonances Another potential problem in heater operation are so-called thermoacoustic resonances, which can lead to excessive noise pollution and, due to the accompanying mechanical vibrations, also to component failure. Often, the resonance phenomena occur especially at low relative burner powers and low combustion chamber pressures.
- an increase in the heating power range of a gas heater or an increase in the burner power range of a burner is desirable in order to be able to serve very different heating requirements, such as, for example, a domestic hot water tap for washing hands, a tap for letting in a bath or caused by heating an apartment. Nevertheless, even at the various possible operating points, the water vapor condensation from the exhaust gas and thermoacoustic resonance phenomena must be avoided.
- the invention is therefore based on the object to provide a gas blower burner with an extended burner power range and a method for its operation, which help to avoid the water vapor condensation on exhaust gas-contacted components and thermoacoustic resonance phenomena.
- the burner should have a simple and compact design.
- the gas blower burner according to the invention with modulable burner power for a gas heater with at least one air path for fan-assisted supply of combustion air, at least one gas path for supplying a fuel gas, a gas valve for volume control of the fuel gas, at least one burner surface as a flame holder and at least one upstream of the burner surface arranged distribution space in the the combustion air and the fuel gas or a fuel gas / air mixture open, is characterized in that the burner surface and the distribution chamber are divided into at least two areas, wherein a first burner surface area is associated with a first distribution space and a second burner surface area is associated with a second distribution space area, and that the gas path at a branch downstream of the gas valve and upstream of the distribution space is divided into at least two partial gas paths, each with an associated area of the distribution space.
- the burner now has a burner surface which is split twice or several times and which can be supplied with fuel gas via the at least two partial gas paths and the at least two distribution chamber regions by means of a single gas valve.
- a suitable embodiment is characterized in that the branch in the gas path is dominated by a switchable two-way valve or multi-way valve.
- the fuel gas supply of the burner surface areas can be changed by means of a switching operation become.
- each burner surface area can be controlled individually and supplied with fuel gas, or several burner surface areas can be supplied simultaneously.
- a further embodiment is characterized in that at least one first partial gas path is in direct communication with an associated first region of the distribution space, and that at least one second partial gas path is in indirect communication with an associated second region of the distribution space, this second partial gas path being in one with the Distribution room connected airway opens.
- a suitable embodiment is characterized in that the partial gas paths each have separately predeterminable flow resistances. This can be e.g. reach through different path lengths, line diameter and fixed or adjustable throttle cross-sections. This ensures that with the help of a single gas control valve and despite the same control signal ranges from the air flow meter on the different partial gas paths different sized amounts of fuel gas can be metered.
- An embodiment is characterized in that a fan is arranged in the air path, wherein the air path opens downstream into at least one region of the distribution space.
- An embodiment is characterized in that the distribution space is divided into at least two areas by means of one or more at least partially permeable intermediate walls.
- This permeability may be in only one flow direction while backflow is blocked, or the permeability may be in either direction.
- the burner surface may be formed as a perforated surface, for example as a perforated plate or wire mesh.
- the perforation can be the same or at least partially different over the different areas of the burner surface.
- a suitable embodiment is characterized in that upstream of the burner surface in the distribution space at least one perforated distributor plate is arranged, which is divided into at least two areas according to the structure of the distribution space, and the perforations of the regions of the distributor plate are at least partially formed differently.
- the distributor plate improves in a known manner the uniform distribution of a combustion air flow or a fuel gas-air mixture flow on the burner surface or the burner surface areas. Due to the different perforations of the distributor plate areas, different flow resistances can be realized.
- the inventive method for operating a gas blower burner with modulable burner power is characterized in that a fuel gas when operating in a first burner power range, for example, a low burner power range, flows directly to a first region of a functioning as a flame burner surface, here with combustion air to a fuel gas air Mixture mixed and then fed to the combustion.
- a fuel gas when operating in a first burner power range, for example, a low burner power range, flows directly to a first region of a functioning as a flame burner surface, here with combustion air to a fuel gas air Mixture mixed and then fed to the combustion.
- a second burner power range for example a high burner power range
- the fuel gas flows via an air-carrying air path to a mixture formation path (mixing space), from where it flows as a fuel gas-air mixture further to a second region of the burner surface and then fed to the combustion ,
- the fuel gas can be supplied to two different burner surface areas and thus cover a low and a high burner power range.
- a suitable embodiment of the method for operating a gas blower burner with modulable burner power with at least one air path for fan-assisted supply of combustion air, at least one gas path for supplying a fuel gas, a gas valve for regulating the volume of the fuel gas, at least one burner surface acting as a flame holder and at least one upstream of the burner surface arranged Distribution space into which the combustion air and the fuel gas or a fuel gas-air mixture open, is characterized
- a fan arranged in the air conveys an air quantity assigned to a predefinable burner output into at least one area of a distribution space arranged in at least two areas
- a two-way valve or multi-way valve arranged downstream of the gas valve and upstream of the distribution space determines the direction of flow of the fuel gas as a function of the predefinable burner output.
- the fuel gas flows directly to at least a first region of the distributor chamber, mixes with combustion air in this region of the distributor chamber and is sent to combustion.
- the fuel gas flows to the air path connected to at least a second region of the distribution space, mixes in the air with combustion air to a fuel gas-air mixture and is supplied to the distribution space and the combustion.
- the low burner power range covers the range between 4% and 20% of the rated burner output
- the high burner power range covers the range between 20% and 100% of the rated burner output.
- the procedure for mixture formation is different for these two burner power ranges.
- the fuel gas flows directly and unmixed through a first partial gas path to a first distribution area, while combustion air also flows to the distribution space.
- fuel gas and combustion air mix to form a fuel gas-air mixture. This exits through the burner area assigned to the first distribution area, is ignited and burnt.
- the fuel gas flows through a second Operagasweg to the airway and mixes with combustion air to a fuel gas-air mixture. The mixture is supplied to the distribution space, exits through the burner surface, is ignited and burned.
- the combustion air sucked in by the fan is conveyed into a second region of the distributor space and flows from there
- said part of the combustion air as secondary air substantially does not participate in the combustion
- permeable partition walls which divide the distribution space into areas in a first region of the distribution over, mixes here as primary air with the fuel gas, flows as a fuel gas-air mixture through the first area of the distribution space associated burner surface into the combustion chamber and is supplied to the combustion.
- the fuel gas-air mixture in the first distribution area is such that an air ratio of ⁇ ⁇ 1, 3 results. This guarantees a complete and low-emission burn tion at the first burner surface area.
- Secondary air flows through the second burner surface area, which mixes with the exhaust gas from the combustion and raises the resulting air ratio in the exhaust gas to, for example, ⁇ 1.5. This lowers the dew point temperature and reduces the tendency to condensation.
- the surfaces of the combustion chamber, heat exchanger and exhaust system remain dry, thus avoiding corrosion damage.
- the inflowing secondary air also increases the back pressure in the combustion chamber, which greatly reduces the susceptibility of the system to thermo-acoustic resonance phenomena.
- the fuel gas-air mixture which has formed in the air and a mixture forming section (mixing chamber) of fuel gas and combustion air, promoted in a second region of the distribution space and flows from there
- the inventive method enables a burner operation with extended modulation range and reduced tendency to water vapor condensation and thermoacoustic resonance phenomena.
- the burner according to the invention offers a simple and compact structure with which the method can be implemented.
- Figure 1 shows a gas blower burner in operation in the high burner power range
- FIG. 2 shows a gas-fired burner operating in the low burner power range.
- FIG. 1 shows a gas-fired burner according to the invention for a gas heater with a combustion air inlet 1, an air path 2, an air flow meter 3, a blower 4, a fuel gas inlet 5, a gas path 6, a gas valve 7, a mixture forming section (mixing chamber) 8, a distribution chamber 9 and a Burner surface 10.
- Partial gas path 6-1 communicates with the distribution area 9-1 and the burner area 10-1.
- Partial gas path 6- 2 communicates via the air path 2 and the mixture formation section 8 with the distribution space region 9-2 and the burner surface region 10-2. Shown in FIG. 1 is an operation in the high burner power range, the combustion air, fuel gas and mixture flows being illustrated by arrows.
- a schematically illustrated switchable two-way valve 13 is arranged. This releases the fuel gas flow in the direction of the partial gas path 6-2, the other path 6-1 is blocked.
- the fuel gas flows into the airway 2, is sucked together with the combustion air from the fan 4, mixes with the combustion air in the airway 2, in the fan 4 and in the mixture formation section 8 to a fuel gas-air mixture.
- the mixture enters the second region 9-2 of the distribution chamber 9 and flows partly through the permeable partition wall 1 1 in the first Verteilraum Society 9-1.
- the permeable distributor plate 12 smoothes the mixture flow and distributes it to the two permeable burner surface regions 10-1 and 10-2.
- the fuel gas-air mixture is ignited by means of an igniter, not shown, forms flames 14 and burns with heat.
- the heat is arranged in a downstream of the burner, not shown here heat exchanger transferred to a heating fluid and fed to the use.
- FIG. 2 shows an operation of the gas-fired burner in the low burner power range, with the combustion air, fuel gas and mixed streams again being illustrated by arrows.
- the two-way valve 13 releases the fuel gas flow in the direction of the partial gas path 6-1, the other path 6-2 is blocked.
- the fuel gas flows through the partial gas path 6-1 in the distribution area 9-1.
- a fuel gas distributor 6-3 serves the uniform distribution of the fuel gas in the distribution area 9-1.
- Combustion air is sucked in by the blower 4 via the air inlet 1 and the air path 2.
- the air enters the second region 9-2 of the distribution chamber 9 and flows partly through a second region 12-2 of the distributor plate 12 and through the second burner surface region 10-2 into the combustion chamber.
- the air mixes with the fuel gas to a fuel gas-air mixture, wherein the fuel gas distribution device 6- 3 is lapped with air, and flows through a first Verteilerplatten Scheme 12-1 and through the first burner surface area 10-1 in the combustion chamber.
- the fuel gas and air mixture is ignited again forms flames 14 and burns with heat.
- the heat is arranged in a downstream of the burner, not shown here heat exchanger transferred to a heating fluid and fed to the use.
- the gas blower burner can modulate (vary) burner output in both burner power ranges.
- the low burner power range covers the range between 4% and 20% of the rated burner output
- the high burner power range covers the range between 20% and 100% of the rated burner output.
- the burner thus has a modulation ratio of 1:25, the fan 4 and the gas control valve 7 have to modulate but only in the ratio 1: 5.
- the flow resistance in the partial gas path 6-1 is greater than that in the partial gas path 6-2.
- the gas valve 7 is on the Generalgasweg 6-1 a smaller amount of fuel gas than via the Operagasweg 6-2.
- the gas control valve 7 works together with the air flow meter 3, for example in a pneumatic composite gas air circulation.
- the delivered air volume is used in the high burner power range completely as combustion air for the fuel gas-air mixture formation.
- In the low burner power range only a part of the air serves as combustion air for the fuel gas-air mixture formation; another part is unmixed with fuel gas from the burner surface and does not participate in the combustion.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009058453A DE102009058453B4 (en) | 2009-12-16 | 2009-12-16 | Gas blower burner with modulable burner power and method for operating a gas blower burner |
PCT/EP2010/069122 WO2011082924A2 (en) | 2009-12-16 | 2010-12-08 | Gas forced air burner having modulatable burner power and method for operating a gas forced air burner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2534421A2 true EP2534421A2 (en) | 2012-12-19 |
EP2534421B1 EP2534421B1 (en) | 2014-03-26 |
Family
ID=44121392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10787464.6A Not-in-force EP2534421B1 (en) | 2009-12-16 | 2010-12-08 | Gas forced air burner having modulatable burner power and method for operating a gas forced air burner |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2534421B1 (en) |
DE (1) | DE102009058453B4 (en) |
WO (1) | WO2011082924A2 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012009628A1 (en) * | 2012-05-15 | 2013-11-21 | Vaillant Gmbh | Fuel gas-air mixing device |
DE102012022767B4 (en) | 2012-11-22 | 2018-09-20 | Robert Bosch Gmbh | Burner head for a gas or oil burner |
DE202014101097U1 (en) * | 2014-03-11 | 2015-06-12 | Ulrich Dreizler | Burner with a surface combustion |
DE102015223681A1 (en) * | 2015-11-30 | 2017-06-01 | Robert Bosch Gmbh | Heat generator, in particular burner, in particular gas and / or oil burner, for generating heat, monitoring device and method for monitoring combustion thereto |
CN107255274A (en) * | 2017-05-24 | 2017-10-17 | 江苏师范大学 | A kind of low nitrogen burner for gas boiler |
US10753617B2 (en) | 2017-08-16 | 2020-08-25 | Haier Us Appliance Solutions, Inc. | Cooktop appliance with a gas burner assembly |
US10480794B2 (en) | 2017-08-16 | 2019-11-19 | Haier Us Appliance Solutions, Inc. | Cooktop appliance with a gas burner assembly |
US10677469B2 (en) * | 2017-10-19 | 2020-06-09 | Haier Us Appliance Solutions, Inc. | Fuel supply system for a gas burner assembly |
US11460190B2 (en) | 2019-07-29 | 2022-10-04 | Haier Us Appliance Solutions, Inc. | Gas burner assembly for a cooktop appliance |
IT202100012668A1 (en) * | 2021-05-17 | 2022-11-17 | Beckett Thermal Solutions S R L | Burner |
CN114198747B (en) * | 2021-12-17 | 2023-11-28 | 徐建波 | Burner |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3825629A1 (en) * | 1987-08-04 | 1989-02-16 | Vaillant Joh Gmbh & Co | Gas burner with burner stems |
AT391197B (en) * | 1988-04-28 | 1990-08-27 | Vaillant Gmbh | DEVICE FOR MONITORING THE OPERATION OF THE BURNER PLATE OF A SURFACE BURNER IMPLEMENTED BY MIXTURE OUTLETS |
US5795145A (en) * | 1997-05-22 | 1998-08-18 | Desa International | Method and apparatus for controlling gas flow to ceramic plaque burners of differing sizes |
JP2002174420A (en) * | 2000-12-06 | 2002-06-21 | Osaka Gas Co Ltd | Combustion apparatus |
DE10251816A1 (en) * | 2002-04-16 | 2004-05-13 | Rolf Kresel | Gas burner for boiler has burner plate insulated from lower casing and elastically connected to it |
US7494337B2 (en) * | 2004-04-22 | 2009-02-24 | Thomas & Betts International, Inc. | Apparatus and method for providing multiple stages of fuel |
WO2006019279A1 (en) * | 2004-08-19 | 2006-02-23 | Kyungdong Boiler Co., Ltd. | Gas burner |
-
2009
- 2009-12-16 DE DE102009058453A patent/DE102009058453B4/en not_active Expired - Fee Related
-
2010
- 2010-12-08 EP EP10787464.6A patent/EP2534421B1/en not_active Not-in-force
- 2010-12-08 WO PCT/EP2010/069122 patent/WO2011082924A2/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011082924A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE102009058453B4 (en) | 2011-09-01 |
WO2011082924A3 (en) | 2011-09-09 |
DE102009058453A1 (en) | 2011-06-22 |
WO2011082924A2 (en) | 2011-07-14 |
EP2534421B1 (en) | 2014-03-26 |
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