IE86230B1 - A burner assembly - Google Patents
A burner assembly Download PDFInfo
- Publication number
- IE86230B1 IE86230B1 IE20080145A IE20080145A IE86230B1 IE 86230 B1 IE86230 B1 IE 86230B1 IE 20080145 A IE20080145 A IE 20080145A IE 20080145 A IE20080145 A IE 20080145A IE 86230 B1 IE86230 B1 IE 86230B1
- Authority
- IE
- Ireland
- Prior art keywords
- burner
- flame
- boiler
- brazier
- granular fuel
- Prior art date
Links
- 239000000446 fuel Substances 0.000 claims abstract description 55
- 239000012530 fluid Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004449 solid propellant Substances 0.000 claims abstract description 7
- 239000002023 wood Substances 0.000 claims description 21
- 239000008188 pellet Substances 0.000 claims description 19
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 239000000567 combustion gas Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 239000003350 kerosene Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 240000008042 Zea mays Species 0.000 description 1
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000003225 biodiesel Substances 0.000 description 1
- 239000002551 biofuel Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000010849 combustible waste Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 235000009973 maize Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B40/00—Combustion apparatus with driven means for feeding fuel into the combustion chamber
- F23B40/06—Combustion apparatus with driven means for feeding fuel into the combustion chamber the fuel being fed along the fuel-supporting surface
- F23B40/08—Combustion apparatus with driven means for feeding fuel into the combustion chamber the fuel being fed along the fuel-supporting surface into pot- or trough-shaped grates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B60/00—Combustion apparatus in which the fuel burns essentially without moving
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q13/00—Igniters not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (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. <Figure 2>
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).
-2Japanese Patent Specification No. JP 2005009768A (Yamamoto) describes a wood pellet burner which has an electrical heating element which is moved against the wood pellets for ignition.
Japanese Patent Specification No. 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.
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), there is described a gas burner to light a coal or coke fire.
-3Similarly, 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).
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 10 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.
STATEMENTS OF INVENTION
According to the invention there is provided a burner assembly for an enclosed water heating boiler for burning solid fuel, the water heating boiler comprising: walls forming a combustion chamber enclosure, hollow heat exchangers arranged for carrying water to be heated by at least a portion of the wails, and the burner assembly comprising two burners namely a granular fuel burner of the type comprising a brazier fed with granular fuel as hereinbefore defined 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
-4granularfuel.
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.
Claims (9)
1. A burner assembly (10) for an enclosed water heating boiler (1) for burning solid fuel, the water heating boiler comprising: walls (2, 3, 4, 5) 5 forming a combustion chamber enclosure (6), hollow heat exchangers (7, 8) arranged for carrying water to be heated by at least a 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 granular fuel (25) as hereinbefore defined and a fluid fired burner (12) 10 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 15 portion of the granular fuel (25) to ignite the granular fuel (25).
2. A burner assembly (10) as claimed in claim 1 in which the fluid fired burner (12) is mounted below the brazier (13). 20
3. 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). 25
4. 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).
5. A burner assembly (10) as claimed in claim 4 in which the diverter flap 30 (16) is formed from a curved scoop-like plate to concentrate flame from the fluid fired burner (12) against the granular fuel (25).
6. A burner assembly (10) as claimed in any preceding claim in which the -9flame 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. 5
7. 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).
8. A method of operating a burner assembly (10) as claimed in any 10 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.
9. 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).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0703469.7A GB0703469D0 (en) | 2007-02-22 | 2007-02-22 | A burner assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
IE20080145A1 IE20080145A1 (en) | 2008-12-10 |
IE86230B1 true IE86230B1 (en) | 2013-07-31 |
Family
ID=37945561
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE20080143A IES20080143A2 (en) | 2007-02-22 | 2008-02-22 | A burner assembly |
IE20080145A IE86230B1 (en) | 2007-02-22 | 2008-02-22 | A burner assembly |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE20080143A IES20080143A2 (en) | 2007-02-22 | 2008-02-22 | A burner assembly |
Country Status (2)
Country | Link |
---|---|
GB (2) | GB0703469D0 (en) |
IE (2) | IES20080143A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2098780A1 (en) * | 2008-03-04 | 2009-09-09 | Alley Enterprises Limited | A burner assembly |
EP2187122B1 (en) * | 2008-11-18 | 2016-10-19 | Alley Enterprises Limited | A granular fuel-fired boiler brazier |
CA2748351C (en) * | 2008-12-23 | 2017-09-05 | Alley Enterprises Limited | A dual fuel boiler |
DE102012105099B4 (en) * | 2012-06-13 | 2014-02-06 | Karlsruher Institut Für Technologie (Kit) | Load-dependent device for burning solid biogenic fuels and method for their operation |
DE102015015557A1 (en) * | 2015-12-01 | 2017-06-01 | Andreas Fuss | Method and device for generating heat |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4312278A (en) * | 1980-07-22 | 1982-01-26 | Board Of Trustees Of The University Of Maine | Chip wood furnace and furnace retrofitting system |
JPS588907A (en) * | 1981-07-08 | 1983-01-19 | Shinsaku Goto | Burner for bath boiler |
-
2007
- 2007-02-22 GB GBGB0703469.7A patent/GB0703469D0/en not_active Ceased
-
2008
- 2008-02-22 IE IE20080143A patent/IES20080143A2/en not_active IP Right Cessation
- 2008-02-22 IE IE20080145A patent/IE86230B1/en unknown
- 2008-02-22 GB GB0803255A patent/GB2446954B/en active Active
Also Published As
Publication number | Publication date |
---|---|
IE20080145A1 (en) | 2008-12-10 |
GB2446954B (en) | 2011-04-20 |
GB0803255D0 (en) | 2008-04-02 |
GB2446954A (en) | 2008-08-27 |
GB0703469D0 (en) | 2007-04-04 |
IES20080143A2 (en) | 2008-12-10 |
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