US20100319591A1 - Thrower wheel of a mechanical stoker - Google Patents

Thrower wheel of a mechanical stoker Download PDF

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Publication number
US20100319591A1
US20100319591A1 US12/866,747 US86674709A US2010319591A1 US 20100319591 A1 US20100319591 A1 US 20100319591A1 US 86674709 A US86674709 A US 86674709A US 2010319591 A1 US2010319591 A1 US 2010319591A1
Authority
US
United States
Prior art keywords
blades
height
thrower wheel
fuel
thrower
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.)
Abandoned
Application number
US12/866,747
Other languages
English (en)
Inventor
Wolfgang Madlsperger
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.)
Siemens AG Oesterreich
Original Assignee
Siemens AG Oesterreich
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG Oesterreich filed Critical Siemens AG Oesterreich
Assigned to SIEMENS AG OESTERREICH reassignment SIEMENS AG OESTERREICH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MADISPERGER, WOLFGANG
Publication of US20100319591A1 publication Critical patent/US20100319591A1/en
Abandoned legal-status Critical Current

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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
    • F23B40/02—Combustion apparatus with driven means for feeding fuel into the combustion chamber the fuel being fed by scattering over the fuel-supporting surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G31/00—Mechanical throwing machines for articles or solid materials
    • B65G31/04—Mechanical throwing machines for articles or solid materials comprising discs, drums, or like rotary impellers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus

Definitions

  • the invention relates to a thrower wheel of a spreader stoker having a plurality of blades disposed on a base plate as well as to a corresponding spreader stoker.
  • the invention can be used in firing plants having thrower wheel mechanical stoking.
  • the solid, particulate fuel is introduced into the combustion chamber with the aid of the thrower wheel disposed in a spreader stoker.
  • the trajectory length can be adjusted by varying the rotational speed of the thrower wheel.
  • the thrower wheel is in this case arranged horizontally, in other words the axis of rotation of the thrower wheel is oriented vertically.
  • the fuel is introduced from above in the region of the hub of the thrower wheel into the housing of the spreader stoker and then conveyed with the aid of the blades of the thrower wheel horizontally outward and—through openings in the spreader stoker—into the combustion chamber.
  • the thrower wheel rotating at high speed is subjected to a high rate of wear.
  • the fuel particles impinge only on the top edge of the blades and therefore are accelerated only impulsively to the requisite exit velocity. This results in high losses during transfer of the kinetic energy of the thrower wheel onto the fuel, which transfer is associated with a high rate of wear of the blades of the thrower wheel.
  • An object of the invention is to improve the energy transfer from the thrower wheel onto the fuel and thereby reduce the wear on the top edges of the blades of the thrower wheel.
  • a thrower wheel as claimed in the independent claim, according to which the height of the blades increases in the radial direction at least in one section and where appropriate remains the same in one or more other sections, and the height of the blade at the inner end of the blade is less than at the outer end of the blade.
  • the height of the blade therefore increases toward the outside, though it can also remain the same over some sections, but must not decrease in any section.
  • the blade is less high on the inside than on the outside.
  • the wear load is distributed from the inner top edge of the blade over a greater surface area, thereby reducing the wear on the top edge of the blade.
  • a possible embodiment variant consists in the height of the blades being increased from the inner end on in a first section and subsequently remaining the same in a second section as far as the outer end. This has the advantage that in the inner section of the blades, where normally the fuel is supplied, the fuel is accelerated continuously at the ascending top edges of the blades and in the second section, where no more fuel is directly supplied from above, it continues to be guided toward the outside.
  • the height of the blade at the inner end should be equal to zero. If this means that the rigidity of the blade is not guaranteed, the blade can be strengthened further outward, for example by means of additional metal plates.
  • the effect of the invention can be increased if the blades are moved away from the region of the hub of the base plate, since the fuel is, of course, usually supplied concentrically to the hub.
  • the inner ends of the blades have a clearance relative to the hub of the base plate.
  • the arrangement and shape of the blades can be varied according to requirements: the blades can be straight or curved; they can run radially outward from the hub, they can be arranged tangentially relative to the hub or they can touch the hub neither directly nor indirectly (via an imaginary extension).
  • the blades can directly adjoin the hub or indeed start only at a distance from the hub.
  • the blades will always extend as far as the rim of the base plate and are fixedly joined to the base plate along the entire length of the bottom edge.
  • the number of blades also depends on the type of fuel and fuel quantity. Two, four or six blades are common.
  • the inventive thrower wheel is installed in a spreader stoker, then the latter comprises at least one housing having at least one feed opening for fuel and at least one ejection opening for fuel.
  • a feed opening for fuel is indeed beneficially provided which is concentric to the axis of rotation of the thrower wheel, such that fuel can be applied onto the thrower wheel in the direction of the axis of rotation.
  • a circumferential ejection opening for fuel can be provided which is arranged normal to the axis of rotation of the thrower wheel such that fuel in the plane of the thrower wheel can be ejected out of the thrower wheel.
  • FIG. 1 shows a schematic view of a spreader stoker having a thrower wheel according to the existing prior art (on the left) and according to the invention (on the right),
  • FIG. 2 shows a view and plan view of an inventive thrower wheel having straight blades
  • FIG. 3 shows a view and plan view of an inventive thrower wheel having curved blades.
  • FIG. 1 is a schematic representation of a spreader stoker in the housing 1 of which a thrower wheel is disposed.
  • the housing 1 has a central feed opening 5 through which fuel (see arrows) can be supplied from above.
  • Said fuel exits from the housing 1 again through the ejection opening 6 .
  • the fuel is conveyed by means of the thrower wheel.
  • This consists of a base plate 2 , a hub 8 and blades.
  • the left part of the figure shows a thrower wheel having conventional blades 4 which have a constant height over their entire length.
  • the right part of the figure shows a thrower wheel according to the invention having blades 7 whose height increases from the inside to the outside.
  • the height of the blade 7 increases from a height that is less than half the maximum height of the blade, up to the maximum height.
  • the second section the height of the blade 7 stays the same up to the outer end of the blade 7 (maximum height).
  • the hub 8 is the same height as the inner end of the blade 7 .
  • the first section of the blade, which directly adjoins the hub 8 extends approximately up to halfway along the blade. The important thing, however, is the ratio to the feed opening 5 , whose diameter—viewed in the radial direction—ends before the blade 7 has reached its maximum height.
  • FIG. 2 shows another possible embodiment of the thrower wheel.
  • four blades 7 are mounted on the base plate 2 .
  • the blades 7 do not adjoin the hub 8 on their inside, but are offset outward by approximately a third of the radius of the base plate 2 .
  • the inner height of the blades is chosen as low as possible, approximately corresponding to the thickness of the metal plate of the blades. The height of the blades increases along a straight line and the maximum height is reached after approximately 2 ⁇ 3 of the length of the blade 7 .
  • FIG. 3 shows a further embodiment variant of the thrower wheel.
  • four blades 7 are disposed on the base plate 2 , although in this case the blades 7 are curved and tangentially abut the hub 8 .
  • the blades 7 At their inner end the blades 7 have a height of somewhat less than half the maximum height. The maximum height of the blades 7 is reached roughly after half of the length of the blades.
  • Highly wear-resistant steel is used as a material for the blades.
  • the base plate 2 of the thrower wheels shown here has a diameter of 450 mm, while the maximum height of the blades 7 equals 85 mm. These dimensions will always need to be adjusted to suit a specific installation, however.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Supercharger (AREA)
US12/866,747 2008-02-18 2009-02-12 Thrower wheel of a mechanical stoker Abandoned US20100319591A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008009683.0 2008-02-18
DE102008009683A DE102008009683B4 (de) 2008-02-18 2008-02-18 Schleuderrad eines Wurfbeschickers
PCT/EP2009/051619 WO2009103654A2 (de) 2008-02-18 2009-02-12 Schleuderrad eines wurfbeschickers

Publications (1)

Publication Number Publication Date
US20100319591A1 true US20100319591A1 (en) 2010-12-23

Family

ID=40730608

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/866,747 Abandoned US20100319591A1 (en) 2008-02-18 2009-02-12 Thrower wheel of a mechanical stoker

Country Status (6)

Country Link
US (1) US20100319591A1 (de)
EP (1) EP2242950B1 (de)
CN (1) CN101946124A (de)
CA (1) CA2715821A1 (de)
DE (1) DE102008009683B4 (de)
WO (1) WO2009103654A2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200033008A1 (en) * 2018-07-26 2020-01-30 David Baker Chip fuel feeder

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT11833U1 (de) * 2010-03-16 2011-05-15 Wilde Andreas Ing Vorrichtung zur wurfbeschickung eines rostes mit kleinstückeligem brennstoff
DE102011110078B4 (de) 2011-08-20 2014-07-10 Saxil-Werk Gmbh Schüttgutsilo und das Verfahren zum Betreiben desselben.
CN110542114B (zh) * 2018-05-28 2021-04-13 张金旗 生物质颗粒燃料抛料机
CN110440280B (zh) * 2019-08-01 2021-06-18 安徽德邦化工有限公司 一种高效节能锅炉
CN112278870A (zh) * 2020-08-14 2021-01-29 山东理工大学 一种气力吸送式分离增强装置
CN114889990A (zh) * 2022-03-21 2022-08-12 江西源生狼和药业有限公司 一种用于艾叶汁液收集加工装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610182A (en) * 1969-10-03 1971-10-05 Air Preheater Sawdust feeder for incinerator
US3993225A (en) * 1975-09-11 1976-11-23 Mario Manni Portable spreader for particulate material
US4646637A (en) * 1985-12-26 1987-03-03 Cloots Henry R Method and apparatus for fluidized bed combustion
US5134944A (en) * 1991-02-28 1992-08-04 Keller Leonard J Processes and means for waste resources utilization
US5215500A (en) * 1992-04-22 1993-06-01 Kirby Donald R Material spreading apparatus
US6343986B1 (en) * 1999-05-26 2002-02-05 David A. Hofer Combine straw and chaff spreader
US20030192967A1 (en) * 2000-05-19 2003-10-16 Highway Equipment Company Adjustable spinner for a particulate material spreader
US20070015556A1 (en) * 2005-07-15 2007-01-18 Deere & Company, A Delaware Corporation Wide-spread impeller spreader for harvesting combine
US7473171B1 (en) * 2007-07-26 2009-01-06 Cnh America Llc Molded spreader disk

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR781237A (fr) * 1934-11-14 1935-05-11 Cie Parisienne De Distrib De C Chargeur-conducteur automatique de chaudières pour chauffage central
DE686716C (de) * 1937-11-19 1940-01-15 Alois Kulis Beschickungsvorrichtung fuer Feuerungen
DE1577554A1 (de) * 1966-02-15 1970-07-23 Wilhelm Ahrens Schleuderradvorrichtung fuer Strahlanlagen
FR2382388A1 (fr) * 1977-03-03 1978-09-29 Fouquet Dany Appareillage de transport pour produits granuleux ou pulverulents
US4759156A (en) * 1986-08-19 1988-07-26 Acd, Inc. Blast media transport and throwing wheel
DE8806500U1 (de) * 1988-05-18 1988-07-07 Teutrine, Annemarie, 59302 Oelde Schleuderrad mit Flügeln für das Abfüllen von Schüttgütern
DE19733946A1 (de) * 1997-08-06 1999-02-11 Ecm Ingenieur Unternehmen Fuer Verfahren und Einrichtung zur thermischen Behandlung von Reststoffen
DE10231522B4 (de) * 2002-07-12 2007-04-05 Maschinen- Und Antriebstechnik Gmbh & Co. Kg Verfahren zur Förderung von Getreide und ähnlich hochwertigen Schüttgut, insbesondere der Landwirtschaft und eine Vorrichtung zur Durchführung des Verfahrens

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610182A (en) * 1969-10-03 1971-10-05 Air Preheater Sawdust feeder for incinerator
US3993225A (en) * 1975-09-11 1976-11-23 Mario Manni Portable spreader for particulate material
US4646637A (en) * 1985-12-26 1987-03-03 Cloots Henry R Method and apparatus for fluidized bed combustion
US5134944A (en) * 1991-02-28 1992-08-04 Keller Leonard J Processes and means for waste resources utilization
US5215500A (en) * 1992-04-22 1993-06-01 Kirby Donald R Material spreading apparatus
US6343986B1 (en) * 1999-05-26 2002-02-05 David A. Hofer Combine straw and chaff spreader
US20030192967A1 (en) * 2000-05-19 2003-10-16 Highway Equipment Company Adjustable spinner for a particulate material spreader
US20070015556A1 (en) * 2005-07-15 2007-01-18 Deere & Company, A Delaware Corporation Wide-spread impeller spreader for harvesting combine
US7473171B1 (en) * 2007-07-26 2009-01-06 Cnh America Llc Molded spreader disk

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200033008A1 (en) * 2018-07-26 2020-01-30 David Baker Chip fuel feeder

Also Published As

Publication number Publication date
EP2242950B1 (de) 2018-10-17
EP2242950A2 (de) 2010-10-27
DE102008009683A1 (de) 2009-08-20
CN101946124A (zh) 2011-01-12
WO2009103654A2 (de) 2009-08-27
DE102008009683B4 (de) 2010-10-21
CA2715821A1 (en) 2009-08-27
WO2009103654A3 (de) 2010-01-28

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SIEMENS AG OESTERREICH, AUSTRIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MADISPERGER, WOLFGANG;REEL/FRAME:024806/0237

Effective date: 20100705

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION