EP2534423B1 - Fuel feed system for a pellet fire - Google Patents

Fuel feed system for a pellet fire Download PDF

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Publication number
EP2534423B1
EP2534423B1 EP11741961.4A EP11741961A EP2534423B1 EP 2534423 B1 EP2534423 B1 EP 2534423B1 EP 11741961 A EP11741961 A EP 11741961A EP 2534423 B1 EP2534423 B1 EP 2534423B1
Authority
EP
European Patent Office
Prior art keywords
fuel feed
casing
outlet
fuel
burn pot
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.)
Active
Application number
EP11741961.4A
Other languages
German (de)
French (fr)
Other versions
EP2534423A4 (en
EP2534423A1 (en
Inventor
Allan David Whitfield
James Alexander Bruce
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.)
ALLAN'S SHEETMETAL AND ENGINEERING SERVICES LIMITE
Original Assignee
Allan's Sheetmetal and Engineering Services Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NZ578968A priority Critical patent/NZ578968A/en
Application filed by Allan's Sheetmetal and Engineering Services Ltd filed Critical Allan's Sheetmetal and Engineering Services Ltd
Priority to PCT/IB2011/050405 priority patent/WO2011098932A1/en
Publication of EP2534423A1 publication Critical patent/EP2534423A1/en
Publication of EP2534423A4 publication Critical patent/EP2534423A4/en
Application granted granted Critical
Publication of EP2534423B1 publication Critical patent/EP2534423B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24BDOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B13/00Details solely applicable to stoves or ranges burning solid fuels 
    • F24B13/04Arrangements for feeding solid fuel, e.g. hoppers 
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B50/00Combustion 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
    • F23B50/12Combustion 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

Description

    Technical Field
  • The present invention is a fuel feed system for use in pellet fires.
  • Background Art
  • Any discussion of the prior art throughout the specification is not an admission that such prior art is widely known or forms part of the common general knowledge in the field.
  • Pellet fires are becoming more popular; they burn compressed pellets of combustible material, normally wood, but corn, grain and other materials are used. The pellets are a uniform size range and composition so their combustion is more predictable than natural wood or coal.
  • Pellet fires automatically feed the fuel into the fire box from a storage hopper. Pellet fires are classified by their method of feeding fuel into the burn pot, top feed or bottom feed.
  • In a bottom feed pellet fire a horizontal auger that normally lies in the base of the burn pot, for at least part of its length, feeds the pellets from the hopper through the burn pot and discharges the ash out the other end. It can be difficult to prevent the fire burning back into the hopper full of fuel if a power failure occurs. The auger is exposed to the full heat of the fire and the abrasive and/or corrosive ash and combustion products. However, aesthetically, many prefer the look of a bottom fed pellet fire as they tend to have a wider exposed flame front.
  • In a top feed pellet fire an inclined auger lifts the pellets from the base of the hopper and discharges them above the burn pot. The pellets then gravity feed into the burn pot, often falling onto an inclined plate first. This feed is from a single tube or chute which forms a single pile of pellets in the burn pot, which some find creates a less aesthetically appealing flame than the bottom feed. The gravity feed section minimises the chance of any burn back into the hopper.
  • WO 2009/134904 discloses a fuel feed system for a pellet fire which includes conveying means within a casing, a single inlet means and a plurality of outlet means.
  • It is preferably an object of the present invention to provide a fuel feed system for a pellet fire that ameliorates one or more of the limitations of existing systems, or provides the consumer with a useful choice.
  • Disclosure of Invention
  • The present invention provides a fuel feed system for a pellet fire which includes conveying means within a casing, said casing including a plurality of inlet means distributed lengthwise along the casing and a plurality of outlet means distributed lengthwise along the casing, such that each inlet means is horizontally offset from the adjacent outlet means and wherein said conveying means is configured to move compressed fuel pellets from an inlet means to an adjacent outlet means; such that in use said fuel feed system is configured to form a plurality of overlapping piles of compressed fuel pellets in a burn pot of the pellet fire.
  • Preferably the longitudinal axis of the casing and the burn pot are approximately parallel.
  • Preferably said inlet means and/or outlet means are apertures in the casing. In a highly preferred form the conveying means is one or more concentrically aligned augers. In a most preferred form the conveying means is a single auger.
  • Preferably the casing is not a single piece of material. In one preferred form the casing is formed by parts of the pellet fire or fuel feed system alone or in combination with additional separate components.
  • In a preferred form the fuel feed system includes a plurality of delivery ducts and/or channels such that each outlet means forms one end of an associated delivery duct or channel, such that at an opposite end of each said delivery duct or channel there is a delivery outlet that is configured to deliver the compressed fuel pellets, directly or indirectly, into the burn pot. Preferably the fuel feed system includes a distribution section which lies between the delivery outlets and the burn pot. In a highly preferred form the distribution section is an angled plate that vertically and/or horizontally separates the delivery outlets and the burn pot.
  • Preferably where the fuel feed system does not include delivery ducts and/or channels it includes a primary distribution section which lies between the outlet means and the burn pot. In a highly preferred form the primary distribution section is an angled plate that vertically and/or horizontally separates the outlet means and the burn pot.
  • The invention also includes a pellet fire incorporating the fuel feed system.
  • Preferably the pellet fire includes a hopper configured to store compressed fuel pellets such that an outlet of the hopper is coterminous with the fuel feed system. In a highly preferred form the casing lies essentially horizontally across the outlet of the hopper.
  • In a further preferred form the fuel feed system includes a plurality of casings, either separated or coterminous, each with at least one conveying means.
  • Brief Description of Drawings
  • By way of example only, a preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings, in which:
  • Figure 1
    is a cutaway pictorial view of a pellet fire showing the fuel feed system;
    Figure 2
    is a pictorial view of a hopper with a fuel feed system and fire box removed from the pellet fire;
    Figure 3
    is a plan view of the hopper with feed system and fire box removed from the pellet fire, with no fuel in the hopper or burn pot;
    Figure 4
    is a cross sectional plan view through the hopper and fuel feed system in the direction of arrows A-A., with no fuel in the burn pot;
    Figure 5
    is a is a plan view of the hopper with feed system and fire box removed from the pellet fire, with fuel pellets in the hopper and interlinking piles of pellets in the burn pot
    Best Mode for Carrying Out the Invention
  • Referring to Figure 1, a cutaway view of a pellet fire (1) including a first sub-assembly (2) is shown. Said first sub assembly (2) includes a hopper (3), fuel feed system (4) and burn pot (5), such that the hopper (3) is a storage container for compressed fuel pellets of a known type. The hopper (3) is connected to the fuel feed system (4), which in turn is connected to the burn pot (5).
  • The burn pot (5) is of a known type that includes a channel (6) with a perforated base (7) which, when the pellet fire (1) is in use, acts as a grate. Other surfaces of the channel (6) or burn pot (5) may also be perforated but this is optional and not shown in the drawings.
    Referring to Figures 2 to 5 the first sub-assembly (2) is shown removed from the pellet fire (1) for clarity. Figures 2 to 4 show the first sub-assembly (2) without compressed fuel pellets.
  • Referring to figures 2 to 4, where figure 4 is a cross sectional view in the direction of arrows A-A shown in figure 2, the fuel feed system (4) including a second sub-assembly (10) is shown. The second sub-assembly (10) includes a conveying means (11), a plurality of inlet means (12) and a plurality of outlet means (13). Each inlet means (12) is separated from the adjacent inlet means (12) by first shield means (14), and each outlet means (13) is separated from the adjacent outlet means (13) by second shield means (15).
  • The conveying means (11) is an auger of known type which lies essentially horizontally (though in some embodiments may be angled) across the base of the hopper (3). The first and second shield means (14,15) form a casing (16) in which the conveying means (11) is located, the inlet and outlet means (12,13) are apertures in this casing (16). Each inlet means (12) is horizontally offset from the nearest outlet means (13) along the length of the casing (16).
  • The first sub-assembly (2) further includes a plurality of delivery means (20) and delivery outlets (21), and a distribution section (22). Each delivery means (20) is a duct which has an outlet means (13) as one end and a delivery outlet (21) as the opposite end. Each delivery means (20) is angled such that the delivery outlet (21) is vertically separated from the associated outlet means (13). The term 'duct' is intended to include hollow prisms with any cross sectional shape, even if the cross sectional shape changes from one end to the other.
  • Each delivery outlet (21) lies above the distribution section (22) which is connected to the burn pot (5). The distribution section (22) is an angled plate extending the length of the channel (6).
  • Referring to figure 5, the first sub-assembly (2) containing compressed fuel pellets is shown. The fuel feed system (4), in use, creates a plurality of overlapping pellet piles (30), such that in use these overlapping piles form a wide flame front in the burn pot (5).
  • By way of example only the flow of compressed fuel pellets through the first sub-assembly with the pellet fire (1) in use will be described.
  • The compressed fuel pellets in the hopper (3) fall, or are pulled through, an inlet means (12). The conveying means (11) then moves these compressed fuel pellets to a horizontally offset adjacent outlet means (13). The compressed fuel pellets then move through the delivery means (20) associated with that outlet means (13) and out of the associated delivery outlet (21). The compressed fuel pellets then fall onto the distribution section (22) and are gravity fed into the channel (6). Each delivery outlet (21) directs compressed fuel pellets onto a separated, but overlapping pellet pile (30) for combustion.
  • As each inlet means (12) is horizontally offset from each adjacent outlet means (13), the mass/volume of compressed fuel pellets through the fuel feed system (4) can be controlled. In other words the compressed fuel pellets cannot fall directly from an inlet means (12) into an outlet means (13), they must be physically moved from one to the other by the conveying means (11). This horizontal separation of adjacent inlet and outlet means (12,13) prevents the compressed fuel pellets from directly feeding from the hopper (3) to the burn pot (5). If the conveying means (11) is stopped then the compressed fuel pellet flow is essentially stopped at the same time.
  • In a further embodiment the fuel feed system (4) is not directly connected to the burn pot (5). In this embodiment the fuel pellets fall from the fuel feed system (4) into the burn pot (5).
  • In a further embodiment (not shown) the distribution section (22) is not present, so that in use the compressed fuel pellets fall directly from each delivery outlet (21) into the burn pot (5).
  • In a further embodiment the second sub-assembly (10) is not at the base of the hopper (3).
  • In a further embodiment the conveying means (11) is a plurality of augers each able to be separately driven.
  • In a further embodiment there are two or more augers which may or may not be concentrically aligned. For example (not shown) they may be parallel with horizontal or vertical separation.
  • In one embodiment (not shown) there are one or more additional casings, each separate from or coterminous with the casing (16). Each of these additional casings is similar to the casing (16) in that they include additional inlet and/or outlet means that are horizontally separated, and house one or more additional conveying means. For example there may be two parallel augers within a single casing, two additional conveying means in two separated casings each configured to, either separately or in combination, create a plurality of overlapping pellet piles (30).
  • In a further embodiment (not shown) the conveying means (11) is not located in the casing (16) and the casing (16) is hollow.

Claims (17)

  1. A fuel feed system (4) for a pellet fire (1) which includes conveying means (11) within a casing (16), said casing (16) including a plurality of inlet means (12) distributed lengthwise along the casing (16) and a plurality of outlet means (13) distributed lengthwise along the casing (16), such that each inlet means (12) is horizontally offset from an adjacent outlet means (13) and wherein said conveying means (11) is configured to move compressed fuel pellets from one of the plurality of inlet means (12) to an adjacent one of the plurality of outlet means (13); such that in use said fuel feed system (4) is configured to form a plurality of overlapping piles (30) of compressed fuel pellets in a burn pot (5) of the pellet fire (1).
  2. The fuel feed system as claimed in claim 1 characterised in that the longitudinal axes of the casing (16) and the burn pot (5) are approximately parallel.
  3. The fuel feed system as claimed in claim 1 or claim 2 characterised in that the casing (16) and the burn pot (5) are vertically separated.
  4. The fuel feed system as claimed in any of the preceding claims characterised in that the said inlet means (12) and/or outlet means (13) are apertures in the casing (16).
  5. The fuel feed system as claimed in any one of the preceding claims characterised in that the conveying means (11) is one or more concentrically aligned augers.
  6. The fuel feed system as claimed in any one of the preceding claims characterised in that the conveying means (11) is a single auger.
  7. The fuel feed system as claimed in any one of the preceding claims characterised in that the fuel feed system (4) includes a plurality of delivery ducts and/or channels, wherein each outlet means (13) forms one end of an associated delivery duct or channel, such that at an opposite end of each said delivery duct or channel there is a delivery outlet (21) that is configured to deliver the compressed fuel pellets, directly or indirectly, into the burn pot (5).
  8. The fuel feed system as claimed in claim 7 characterised in that the fuel feed system (4) includes a distribution section (22) which lies between the delivery outlets (21) and the burn pot (5).
  9. The fuel feed system as claimed in claim 8 characterised in that the distribution section (22) is an angled plate that vertically and horizontally separates the delivery outlets (21) and the burn pot (5).
  10. The fuel feed system as claimed in any one of claims 1 to 6 characterised in that the fuel feed system (4) includes a primary distribution section which lies between the outlet means (13) and the burn pot (5).
  11. The fuel feed system as claimed in claim 10 characterised in that the primary distribution section is an angled plate that vertically and horizontally separates the outlet means (13) and the burn pot (5).
  12. The fuel feed system as claimed in any one of the preceding claims characterised in that the casing (16) is not a single piece of material.
  13. The fuel feed system as claimed in claim 12 characterised in that the casing (16) is formed by parts of the pellet fire (1) or fuel feed system (4) alone or in combination with additional separate components.
  14. The fuel feed system as claimed in any one of the preceding claims which includes at least one additional casing, either separated from or coterminous with the casing (16), wherein the or each additional casing includes one or more additional conveying means.
  15. A pellet fire (1) including the fuel feed system (4) as claimed in any one of the preceding claims.
  16. The pellet fire as claimed in claim 15 characterised in that it includes a hopper (3) configured to store compressed fuel pellets such that an outlet of the hopper (3) is coterminous with the fuel feed system (4).
  17. The pellet fire as claimed in claim 16 characterised in that the casing (16) lies essentially horizontally across the outlet of the hopper (3).
EP11741961.4A 2010-02-10 2011-01-31 Fuel feed system for a pellet fire Active EP2534423B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NZ578968A NZ578968A (en) 2010-02-10 2010-02-10 Fuel feed system for a pellet fire
PCT/IB2011/050405 WO2011098932A1 (en) 2010-02-10 2011-01-31 Fuel feed system for a pellet fire

Publications (3)

Publication Number Publication Date
EP2534423A1 EP2534423A1 (en) 2012-12-19
EP2534423A4 EP2534423A4 (en) 2017-11-22
EP2534423B1 true EP2534423B1 (en) 2019-06-12

Family

ID=43901733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11741961.4A Active EP2534423B1 (en) 2010-02-10 2011-01-31 Fuel feed system for a pellet fire

Country Status (6)

Country Link
EP (1) EP2534423B1 (en)
JP (1) JP5780436B2 (en)
AU (1) AU2011213993B2 (en)
HU (1) HUE046137T2 (en)
NZ (1) NZ578968A (en)
WO (1) WO2011098932A1 (en)

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CN102827073A (en) 2011-06-17 2012-12-19 安吉奥斯医药品有限公司 Therapeutically active compositions and application methods thereof
US9474779B2 (en) 2012-01-19 2016-10-25 Agios Pharmaceuticals, Inc. Therapeutically active compositions and their methods of use
WO2015003355A2 (en) 2013-07-11 2015-01-15 Agios Pharmaceuticals, Inc. Therapeutically active compounds and their methods of use
WO2015006591A1 (en) 2013-07-11 2015-01-15 Agios Pharmaceuticals, Inc. 2,4- or 4,6-diaminopyrimidine compounds as idh2 mutants inhibitors for the treatment of cancer
US9579324B2 (en) 2013-07-11 2017-02-28 Agios Pharmaceuticals, Inc Therapeutically active compounds and their methods of use
US20150031627A1 (en) 2013-07-25 2015-01-29 Agios Pharmaceuticals, Inc Therapeutically active compounds and their methods of use
CN106255498B (en) 2014-03-14 2020-06-26 阿吉奥斯制药公司 Pharmaceutical compositions of therapeutically active compounds
EP3362066A4 (en) 2015-10-15 2019-06-19 Agios Pharmaceuticals, Inc. Combination therapy for treating malignancies
US10980788B2 (en) 2018-06-08 2021-04-20 Agios Pharmaceuticals, Inc. Therapy for treating malignancies

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US6223737B1 (en) * 1999-09-27 2001-05-01 Carrol E. Buckner Pellet fuel burning device
JP2005300022A (en) * 2004-04-12 2005-10-27 Narasaki Seisakusho:Kk Combustion apparatus of solid fuel
JP4725712B2 (en) * 2005-01-25 2011-07-13 オヤマダエンジニアリング株式会社 Solid fuel combustion equipment
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JP4719712B2 (en) * 2007-05-08 2011-07-06 ネポン株式会社 Horticultural house heating device with wood burning combustion furnace
WO2009134904A2 (en) * 2008-04-29 2009-11-05 Timothy Randall Carlson Systems and methods relating to fireplaces comprising modular feed and combustion systems for biomass solid particulate fuels

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Also Published As

Publication number Publication date
NZ578968A (en) 2011-03-31
JP5780436B2 (en) 2015-09-16
AU2011213993B2 (en) 2014-11-06
EP2534423A4 (en) 2017-11-22
HUE046137T2 (en) 2020-02-28
WO2011098932A1 (en) 2011-08-18
EP2534423A1 (en) 2012-12-19
JP2013519858A (en) 2013-05-30
AU2011213993A1 (en) 2012-08-30

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