EP2098780A1 - A burner assembly - Google Patents
A burner assembly Download PDFInfo
- Publication number
- EP2098780A1 EP2098780A1 EP08102279A EP08102279A EP2098780A1 EP 2098780 A1 EP2098780 A1 EP 2098780A1 EP 08102279 A EP08102279 A EP 08102279A EP 08102279 A EP08102279 A EP 08102279A EP 2098780 A1 EP2098780 A1 EP 2098780A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- burner
- flame
- brazier
- fuel
- granular fuel
- 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- Withdrawn
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B1/00—Combustion apparatus using only lump fuel
- F23B1/16—Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support
- F23B1/28—Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support using ridge-type grate, e.g. for combustion of peat, sawdust, or pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B1/00—Combustion apparatus using only lump fuel
- F23B1/30—Combustion apparatus using only lump fuel characterised by the form of combustion chamber
- F23B1/38—Combustion apparatus using only lump fuel characterised by the form of combustion chamber for combustion of peat, sawdust, or pulverulent fuel on a grate or other fuel support
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B50/00—Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone
- F23B50/12—Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone the fuel being fed to the combustion zone by free fall or by sliding along inclined surfaces, e.g. from a conveyor terminating above the fuel bed
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- 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
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/02—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air lump and liquid fuel
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- 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
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/04—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air lump and gaseous fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/10—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses
- F23G7/105—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses of wood waste
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q13/00—Igniters not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/10—Supplementary heating arrangements using auxiliary fuel
- F23G2204/103—Supplementary heating arrangements using auxiliary fuel gaseous or liquid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/26—Biowaste
- F23G2209/261—Woodwaste
Definitions
- the present invention relates to a burner assembly for an enclosed water heating boiler for burning solid fuel of the type comprising: walls forming a combustion chamber enclosure, hollow heat exchangers arranged for carrying water to be heated from by at least portion of the walls, and the boiler assembly comprising two burners namely a granular fuel burner of the type comprising a brazier fed with the granular fuel and a fluid fired burner characterised in that the fluid fired burner is mounted remote from the brazier whereby the flame generated by the fluid fired burner is directed beside and substantially away from the brazier and in which a flame transfer device is provided to direct some of the flame generated by the fluid fired burner as a concentrated jet against portion of the granulated fuel to ignite the granular fuel.
- granular fuel is used to include not only granular fuel such as wood pellets, but also other solid materials such as ground or semi-shredded husks of maize and similar products together with particles of combustible waste material and other recognised fuels such as coal, peat and similar materials.
- fluid fired burner is used to include not alone burners that burn liquids such as bio-fuels, for example, bio-diesel, bio-kerosene or simply kerosene and diesel, but also gas fired burners.
- JP 2005009768A (Yamamoto ) describes a wood pellet burner which has an electrical heating element which is moved against the wood pellets for ignition.
- JP 58008907A (Gotou Shinsaku ) describes a solid fuel burner which burns waste material such as used tyres or the like, but also wood and coal and has a liquid fuel burner for kerosene or gas fuel for starting the burner. It also describes that if the solid fuel is not available, it is acceptable to use only the liquid fuel. Similarly, it states that the liquid fuel burner may be replaced by a gas fuel burner.
- GB Patent Specification No. 278554A (Camelon ) describes a further gas burner used to light a solid fire, as does GB Patent Specification No. 281461A (Russell ).
- the present invention is directed towards overcoming the problems referred to above in relation to the present construction of burner assemblies and also boilers fitted with such burner assemblies. It is also directed at providing a more efficient method of using such burner assemblies and operating such boilers.
- a burner assembly for an enclosed water heating boiler for burning solid fuel of the type comprising: walls forming a combustion chamber enclosure, hollow heat exchangers arranged for carrying water to be heated from by at least portion of the walls, and the burner assembly comprising two burners namely a granular fuel burner of the type comprising a brazier fed with the granular fuel and a fluid fired burner characterised in that the fluid fired burner is mounted remote from the brazier whereby the flame generated by the fluid fired burner is directed beside and substantially away from the brazier and in which a flame transfer device is provided to direct some of the flame generated by the fluid fired burner as a concentrated jet against portion of the granular fuel to ignite the granular fuel.
- the fluid fired burner is mounted below the brazier which allows for very efficient operation.
- the flame transfer device is a tube having an entrance projecting into the path of the flame and an exit directed onto a concentrated area of the brazier.
- the flame transfer device comprises a diverter flap mounted on the brazier. Such a flap may be formed from a curved scoop-like plate to concentrate flame from the fluid fired burner against the granular fuel.
- the flame transfer device is movable from a position to lie within the flame exiting from the fluid fired burner and a position remote from the flame. This may be carried out by a solenoid valve and associated pneumatic ram.
- a method of operating a burner assembly of the type described above is provided in which, on start up of the burner assembly, the granular fuel combustion air feed is initiated at low volume as the fluid fuel fired burner is starting to ignite the granular fuel and is increased to optimum volume as the fluid fired burner is switched off.
- the fluid fired burner and the granular fuel may be burned in parallel to provide a boot in combustion capacity of the boiler.
- an enclosed water heating boiler indicated generally by the reference numeral 1, having a plurality of walls, namely a top wall 2, side walls 3, base wall 4 and front wall formed by a door 5 forming a combustion chamber enclosure 6.
- the walls 2 and 3 form hollow water carrying heat exchangers 7 and 8 respectively. Details of these are not included because they are all conventional. There may be other hollow heat exchangers mounted in the combustion chamber 6.
- a boiler assembly indicated generally by the reference numeral 10 comprising a granular fuel burner, namely, a wood pellet burner 11 and a fluid fired burner, namely, an oil fired burner 12.
- the wood pellet burner 11 is a specific type of granular fuel burner and other granular fuel burners could be used.
- the wood pellet burner 11 includes a brazier 13 having a perforated floor 14 and mounting a flame transfer device indicated generally by the reference numeral 15 which flame transfer device 15 comprises a diverter flap 16 pivotally mounted on the brazier 13 adjacent to the perforated floor 14.
- the flame transfer device 15 is in the form of a curved scoop-like plate 16 as illustrated in Fig. 3 .
- the plate 16 is, in turn, connected to a solenoid valve and associated pneumatic ram 17.
- an auger 20 operated by a motor 21 feeding a flexible hose 22 to deliver wood pellets from a wood pellet storage (not shown) to the wood pellet burner 11.
- the wood pellets are identified by the reference numeral 25.
- the oil burner 12 is a conventional oil burner, but could be any fluid fired burner such as a gas burner. Conventional controls, thermostats etc provided and are not shown.
- Fig. 1 the burner assembly operating as a wood pellet burner only and heating the combustion chamber enclosure 6, the flame or hot combustion gases being represented by the arrows.
- Fig. 2 illustrates the position at start up.
- the oil burner 12 is operated and the flap 16 is pivoted downwards by the pneumatic ram 17 such that it projects within the flame emanating from the oil fired burner 12. This would not be necessarily the hottest part of the flame, but would be flame somewhere in the order of 800°C.
- the flame is then directed in a concentrated manner up the scoop-like flap 16 through some of the apertures 13 of the brazier 12.
- a small amount of the wood pellets are quickly burned and ignited.
- the ignited wood pellets quickly burn the rest of the wood pellets and this combustion is formed with relatively little formation of CO. Further, it is envisaged that a certain amount of air will be directed beneath the brazier 12 by starting the fan which is usually fitted to such boilers thus ensuring that there will be sufficient air for combustion of the wood pellets while only a small amount of the wood pellets are initially ignited. This greatly reduces the CO formation and the amount of time it takes for the wood pellets to burn at the optimum rate. Then the oil burner is switched off and the boiler operates as illustrated in Fig. 1 . Fig. 4 shows the boiler operating simply with the oil burner 12 being used and the granular fuel burner not in operation. It will be noted that the oil fired burner flame is directed substantially beside and away from the brazier 13.
- a boiler 1 and burner assembly 10 as heretofore.
- the only difference between the burner assembly as illustrated is that instead of the pivoting flap 16 there is provided a transfer device, again, for clarity, identified generally by the reference numeral 15, which heat transfer device 15 comprises a fixed tube 31 having open ends forming an entrance 32 and an exit 33 and mounted beneath the apertures 14 of the brazier 13.
- the transfer device 15 comprises a fixed tube 31 having open ends forming an entrance 32 and an exit 33 and mounted beneath the apertures 14 of the brazier 13.
- the flame is diverted up the fixed tube 31, again in a concentrated manner to a small amount of the fuel in the brazier 12 and it operates in substantially the same manner as heretofore.
- the fixed tube 31 may also be pivoted and operated by a ram or other means as appropriate.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Wood Science & Technology (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
An enclosed water heater boiler (1) for burning solid fuel is disclosed. The burner assembly (10) has two burners namely a granular fuel burner (11) and a fuel fired burner (12). The granular fuel burner (11) has a brazier fed with the granular fuel and the fluid fired burner (12) being mounted remote from the brazier such that the flame generated by the fluid fired burner (12) is directed beside and substantially away from the brazier. A flame transfer device (15) is provided to direct some of the flame generated by the fluid fired burner (12) as a concentrated jet against portion of the granulated fuel (25) to ignite the granular fuel allowing for extremely efficient ignition and a substantial reduction in CO generation. This burner assembly provides additional heat from boilers as required over short periods of time.
Description
- The present invention relates to a burner assembly for an enclosed water heating boiler for burning solid fuel of the type comprising: walls forming a combustion chamber enclosure, hollow heat exchangers arranged for carrying water to be heated from by at least portion of the walls, and the boiler assembly comprising two burners namely a granular fuel burner of the type comprising a brazier fed with the granular fuel and a fluid fired burner characterised in that the fluid fired burner is mounted remote from the brazier whereby the flame generated by the fluid fired burner is directed beside and substantially away from the brazier and in which a flame transfer device is provided to direct some of the flame generated by the fluid fired burner as a concentrated jet against portion of the granulated fuel to ignite the granular fuel.
- In this specification the term "granular fuel" is used to include not only granular fuel such as wood pellets, but also other solid materials such as ground or semi-shredded husks of maize and similar products together with particles of combustible waste material and other recognised fuels such as coal, peat and similar materials. Further, the term "fluid fired burner" is used to include not alone burners that burn liquids such as bio-fuels, for example, bio-diesel, bio-kerosene or simply kerosene and diesel, but also gas fired burners.
- Generally granular fuel boilers to date have simply included one burner, namely a burner for the granular fuel, which granular fuel is lit by some element. The granular fuel is on a brazier and an electric element is used to heat the granular fuel, very often wood pellets, until the wood or other granular fuel spontaneously ignites. There are problems with this. Firstly, it takes some considerable time, indeed somewhere in the order of ten minutes, before the boiler proceeds to operate. Then it takes some time before the granular fuel is ignited and the boiler starts working at capacity. Indeed, as the boiler is starting up, there is a considerable amount of unwanted gasses produced, particularly carbon monoxide (CO).
- Japanese Patent Specification No.
JP 2005009768A (Yamamoto - Japanese Patent Specification No.
JP 58008907A (Gotou Shinsaku - It is thus being proposed to use an additional fluid fired burner in the boiler, particularly for start up and indeed as a back up when there is no granular fuel available. These dual burner assemblies are provided with the oil burner usually above the granular fuel bed which is formed by a brazier having a plurality of holes like any solid fuel grate such as to encourage combustion. The problem is that the fluid fired boiler does not deliver the flame as it is formed directly onto the granular fuel, but is directed across the granular fuel in the brazier such that all of the fuel is initially heated and it takes some considerable time again to achieve optimum working conditions though much quicker than with electric elements. During this period there is a substantial amount of CO generated which is undesirable. A further problem that has been noted is that there is very often insufficient air causing further CO to be formed. The problem seems to be that almost the whole bed is ignited at the one time.
- A further problem with all such boilers and, in particular, with boilers having granular burners, is that they seem to take longer to get up to sufficient heat than, for example, with the conventional fluid fired burner. It has also been noted that in many instances there is a need for additional heat from the boilers over short periods of time.
- Further, it has to be noted that in the past, for example, in
GB Patent Specification No. 502192A (Rouse - Similarly,
GB Patent Specification No. 278554A (Camelon GB Patent Specification No. 281461A (Russell - These obviously work very well, for example, with open fires or the like but are totally unsuitable for an enclosed boiler burning granular fuel in accordance with this invention.
- The present invention is directed towards overcoming the problems referred to above in relation to the present construction of burner assemblies and also boilers fitted with such burner assemblies. It is also directed at providing a more efficient method of using such burner assemblies and operating such boilers.
- According to the invention there is provided a burner assembly for an enclosed water heating boiler for burning solid fuel of the type comprising: walls forming a combustion chamber enclosure, hollow heat exchangers arranged for carrying water to be heated from by at least portion of the walls, and the burner assembly comprising two burners namely a granular fuel burner of the type comprising a brazier fed with the granular fuel and a fluid fired burner characterised in that the fluid fired burner is mounted remote from the brazier whereby the flame generated by the fluid fired burner is directed beside and substantially away from the brazier and in which a flame transfer device is provided to direct some of the flame generated by the fluid fired burner as a concentrated jet against portion of the granular fuel to ignite the granular fuel. This allows for extremely efficient ignition and a substantial reduction in CO generation.
- In one embodiment the fluid fired burner is mounted below the brazier which allows for very efficient operation. In another embodiment the flame transfer device is a tube having an entrance projecting into the path of the flame and an exit directed onto a concentrated area of the brazier. Alternatively, the flame transfer device comprises a diverter flap mounted on the brazier. Such a flap may be formed from a curved scoop-like plate to concentrate flame from the fluid fired burner against the granular fuel.
- Ideally, the flame transfer device is movable from a position to lie within the flame exiting from the fluid fired burner and a position remote from the flame. This may be carried out by a solenoid valve and associated pneumatic ram.
- A method of operating a burner assembly of the type described above is provided in which, on start up of the burner assembly, the granular fuel combustion air feed is initiated at low volume as the fluid fuel fired burner is starting to ignite the granular fuel and is increased to optimum volume as the fluid fired burner is switched off.
- In this method the fluid fired burner and the granular fuel may be burned in parallel to provide a boot in combustion capacity of the boiler.
- The invention will be more clearly understood from the following description of some embodiments thereof given by way of example only with reference to the accompanying drawings in which:
-
Fig. 1 is a side diagrammatic view of a burner assembly according to the invention fitted to an enclosed water heating boiler showing the boiler operating as a granular fuel boiler, -
Fig. 2 is a view similar toFig. 1 showing the boiler at start up, -
Fig. 3 a sectional view along the lines III-III ofFig. 2 , -
Fig. 4 is a view showing the boiler operating using a fluid fired burner only, -
Fig. 5 is a view of an alternative construction of burner assembly running as a granular fuel boiler, -
Fig. 6 is a view showing the boiler ofFig. 5 on start up, and -
Fig. 7 is a view of the boiler ofFig. 6 showing the boiler operating solely with a fluid fired burner. - Referring to the drawings and initially to
Figs. 1 to 4 thereof, there is provided an enclosed water heating boiler indicated generally by thereference numeral 1, having a plurality of walls, namely atop wall 2,side walls 3,base wall 4 and front wall formed by adoor 5 forming acombustion chamber enclosure 6. As illustrated, thewalls heat exchangers combustion chamber 6. - Mounted in the
door 5 is a boiler assembly indicated generally by thereference numeral 10 comprising a granular fuel burner, namely, awood pellet burner 11 and a fluid fired burner, namely, an oil firedburner 12. Thewood pellet burner 11 is a specific type of granular fuel burner and other granular fuel burners could be used. Thewood pellet burner 11 includes abrazier 13 having a perforatedfloor 14 and mounting a flame transfer device indicated generally by thereference numeral 15 whichflame transfer device 15 comprises adiverter flap 16 pivotally mounted on thebrazier 13 adjacent to the perforatedfloor 14. Theflame transfer device 15 is in the form of a curved scoop-like plate 16 as illustrated inFig. 3 . Theplate 16 is, in turn, connected to a solenoid valve and associatedpneumatic ram 17. There is further illustrated anauger 20 operated by amotor 21 feeding aflexible hose 22 to deliver wood pellets from a wood pellet storage (not shown) to thewood pellet burner 11. The wood pellets are identified by thereference numeral 25. - The
oil burner 12 is a conventional oil burner, but could be any fluid fired burner such as a gas burner. Conventional controls, thermostats etc provided and are not shown. - In operation, there is illustrated in
Fig. 1 the burner assembly operating as a wood pellet burner only and heating thecombustion chamber enclosure 6, the flame or hot combustion gases being represented by the arrows.Fig. 2 illustrates the position at start up. Theoil burner 12 is operated and theflap 16 is pivoted downwards by thepneumatic ram 17 such that it projects within the flame emanating from the oil firedburner 12. This would not be necessarily the hottest part of the flame, but would be flame somewhere in the order of 800°C. The flame is then directed in a concentrated manner up the scoop-like flap 16 through some of theapertures 13 of thebrazier 12. Thus, a small amount of the wood pellets are quickly burned and ignited. Then the ignited wood pellets quickly burn the rest of the wood pellets and this combustion is formed with relatively little formation of CO. Further, it is envisaged that a certain amount of air will be directed beneath thebrazier 12 by starting the fan which is usually fitted to such boilers thus ensuring that there will be sufficient air for combustion of the wood pellets while only a small amount of the wood pellets are initially ignited. This greatly reduces the CO formation and the amount of time it takes for the wood pellets to burn at the optimum rate. Then the oil burner is switched off and the boiler operates as illustrated inFig. 1 .Fig. 4 shows the boiler operating simply with theoil burner 12 being used and the granular fuel burner not in operation. It will be noted that the oil fired burner flame is directed substantially beside and away from thebrazier 13. - It will be appreciated that if an additional heat is required for some reason, then both the oil fired burner and the wood pellet burner can both operate in tandem, further increasing the capacity of the boiler, somewhat equivalent to those boilers sold under the term or designation "Combi". Thus, it would be possible to provide relatively small boilers and high heat output.
- Referring to
Figs. 5 to 7 inclusive in which parts similar to those described in the previous drawings are identified by the same reference numerals, there is illustrated aboiler 1 andburner assembly 10 as heretofore. The only difference between the burner assembly as illustrated is that instead of the pivotingflap 16 there is provided a transfer device, again, for clarity, identified generally by thereference numeral 15, whichheat transfer device 15 comprises a fixedtube 31 having open ends forming anentrance 32 and anexit 33 and mounted beneath theapertures 14 of thebrazier 13. Now, on start up, the flame is diverted up the fixedtube 31, again in a concentrated manner to a small amount of the fuel in thebrazier 12 and it operates in substantially the same manner as heretofore. It is envisaged that the fixedtube 31 may also be pivoted and operated by a ram or other means as appropriate. - In the specification the terms "comprise, comprises, comprised and comprising" or any variation thereof and the terms "include, includes, included and including" or any variation thereof are considered to be totally interchangeable and they should all be afforded the widest possible interpretation and vice versa.
- The invention is not limited to the embodiments hereinbefore described which may be varied in both construction and detail.
Claims (9)
- A burner assembly (10) for an enclosed water heating boiler (1) for burning solid fuel of the type comprising: walls (2, 3, 4, 5) forming a combustion chamber enclosure (6), hollow heat exchangers (7, 8) arranged for carrying water to be heated from by at least portion of the walls (2, 3), and the burner assembly (10) comprising two burners namely a granular fuel burner (11) of the type comprising a brazier (13) fed with the granular fuel (25) and a fluid fired burner (12) characterised in that the fluid fired burner (12) is mounted remote from the brazier (13) whereby the flame generated by the fluid fired burner (12) is directed beside and substantially away from the brazier (13) and in which a flame transfer device (15) is provided to direct some of the flame generated by the fluid fired burner (12) as a concentrated jet against portion of the granular fuel (25) to ignite the granular fuel (25).
- A burner assembly (10) as claimed in claim 1 in which the fluid fired burner (12) is mounted below the brazier (13).
- A burner assembly (10) as claimed in claim 1 or 2 in which the flame transfer device (15) is a tube (31) having an entrance (32) projecting into the path of the flame and an exit (33) directed onto a concentrated area of the brazier (13).
- A burner assembly (10) as claimed in claim 1 or 2 in which the flame transfer device (15) comprises a diverter flap (16) mounted on the brazier (13).
- A burner assembly (10) as claimed in claim 4 in which the diverter flap (16) is formed from a curved scoop-like plate to concentrate flame from the fluid fired burner (12) against the granular fuel (25).
- A burner assembly (10) as claimed in any preceding claim in which the flame transfer device (15) is movable from a position to lie within the flame exiting from the fluid fired burner (12) and a position remote from the flame.
- A burner assembly (10) as claimed in claim 6 in which the flame transfer device (15) is operated by a solenoid valve and associated pneumatic ram (17).
- A method of operating a burner assembly (10) as claimed in any preceding claim in which, on start up of the burner assembly (10), the granular fuel combustion air feed is initiated at low volume as the fluid fuel fired burner (12) is starting to ignite the granular fuel (25) and is increased to optimum volume as the fluid fired burner (12) is switched off.
- A method as claimed in claim 8 in which the fluid fired burner (12) and the granular fuel burner (11) are operated in parallel to provide a boost in combustion capacity of the boiler (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP08102279A EP2098780A1 (en) | 2008-03-04 | 2008-03-04 | A burner assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP08102279A EP2098780A1 (en) | 2008-03-04 | 2008-03-04 | A burner assembly |
Publications (1)
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EP2098780A1 true EP2098780A1 (en) | 2009-09-09 |
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Family Applications (1)
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EP08102279A Withdrawn EP2098780A1 (en) | 2008-03-04 | 2008-03-04 | A burner assembly |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102012018A (en) * | 2010-06-13 | 2011-04-13 | 山东圣威新能源有限公司 | Boiler utilizing external combustible waste gas |
EP2940383A1 (en) * | 2014-04-30 | 2015-11-04 | Warmflow Engineering Company Limited | Wood pellet boiler |
CN107477567A (en) * | 2017-07-26 | 2017-12-15 | 北京巨星新能源科技有限公司 | A kind of biomass bulk cargo gasification, and combustion chamber device |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB278554A (en) | 1926-12-24 | 1927-10-13 | Camelon Iron Company Ltd | Improvements in domestic fire grates |
GB281461A (en) | 1926-11-11 | 1927-12-08 | Edgar Russell | Improved means of lighting coal, coke or other fuel fires |
US1842227A (en) * | 1927-12-24 | 1932-01-19 | Sulzer Ag | Ignition device for use with fire grates burning solid fuels |
GB502192A (en) | 1937-10-11 | 1939-03-14 | Alexander Macdonald Rouse | Improvements in or relating to gas-fired devices for lighting coal or coke fires |
JPS588907A (en) | 1981-07-08 | 1983-01-19 | Shinsaku Goto | Burner for bath boiler |
JPS58184420A (en) * | 1982-04-22 | 1983-10-27 | Hitachi Zosen Corp | Method for burning dust burner for combustible powder |
CA1168516A (en) * | 1981-10-13 | 1984-06-05 | Desjardins Lamontagne, Alice | Wood chip burning furnace |
FR2733303A1 (en) * | 1995-04-19 | 1996-10-25 | Gaz De France | Combined heater and waste burner |
JP2005009768A (en) | 2003-06-19 | 2005-01-13 | Yamamoto Co Ltd | Ignition device of pellet stove |
DE202006002349U1 (en) * | 2006-02-15 | 2006-08-31 | Dusel, Anton | High heat stability component for heating ovens made from low alloy steel is cost effective to produce and avoids high cost of high alloy steel |
GB2446954A (en) * | 2007-02-22 | 2008-08-27 | Alley Enterprises Ltd | A Burner Assembly |
-
2008
- 2008-03-04 EP EP08102279A patent/EP2098780A1/en not_active Withdrawn
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102012018A (en) * | 2010-06-13 | 2011-04-13 | 山东圣威新能源有限公司 | Boiler utilizing external combustible waste gas |
EP2940383A1 (en) * | 2014-04-30 | 2015-11-04 | Warmflow Engineering Company Limited | Wood pellet boiler |
US10036554B2 (en) | 2014-04-30 | 2018-07-31 | Warmflow Engineering Company Limited | Wood pellet boiler |
GB2525629B (en) * | 2014-04-30 | 2018-08-01 | Warmflow Engineering Company Ltd | Improved wood pellet boiler access door and burner assembly |
CN107477567A (en) * | 2017-07-26 | 2017-12-15 | 北京巨星新能源科技有限公司 | A kind of biomass bulk cargo gasification, and combustion chamber device |
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