US20100323310A1 - Method for mechanical stoking in firing installations and firing installation - Google Patents

Method for mechanical stoking in firing installations and firing installation Download PDF

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Publication number
US20100323310A1
US20100323310A1 US12/866,263 US86626309A US2010323310A1 US 20100323310 A1 US20100323310 A1 US 20100323310A1 US 86626309 A US86626309 A US 86626309A US 2010323310 A1 US2010323310 A1 US 2010323310A1
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US
United States
Prior art keywords
grate
combustion chamber
fuel
length
mechanical
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
US12/866,263
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English (en)
Inventor
Dietmar Baumann
Wolfgang Madlsperger
Willibald Weiss
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: BAUMANN, DIETMAR, MADISPERGER, WOLFGANG, WEISS, WILLIBALD
Publication of US20100323310A1 publication Critical patent/US20100323310A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F23K3/16—Over-feed arrangements
    • F23K3/18—Spreader stokers
    • 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

Definitions

  • the invention relates to a method for mechanical stoking in firing plants in which fuel is deposited by means of a mechanical spreader stoker onto a grate which is disposed in the combustion chamber, wherein the direction of throw is oriented opposite to the conveying direction of the grate, as well as to a corresponding firing plant.
  • the invention can be used in firing plants employing thrower wheel mechanical stoking.
  • the solid, particulate fuel is introduced into the combustion chamber with the aid of the thrower wheel disposed in the mechanical spreader stoker.
  • the trajectory length can be adjusted by varying the rotational speed of the thrower wheel.
  • Analogous plants are known for example from DE4217070A1, where coal is broadcast onto a horizontal grate by means of mechanical stoking. According to this arrangement the mechanical spreader stoker is mounted approximately vertically over the end of the grate in the front wall of the combustion chamber.
  • the object is achieved by means of a method as claimed in the independent claim, according to which the fuel is introduced immediately below the combustion chamber cover, and more specifically, viewed in the direction of conveyance of the grate, ahead of the end of the grate such that there is created on the grate, between the mechanical spreader stoker and the end of the grate, a burnout zone onto which no fresh fuel is deposited.
  • the thrower wheel is generally disposed horizontally, i.e. the axis of rotation of the thrower wheel is vertical.
  • the fuel is introduced from above in the region of the hub of the thrower wheel into the housing of the mechanical spreader stoker and then conveyed horizontally outward with the aid of the blades of the thrower wheel and delivered—through openings in the mechanical spreader stoker—into the combustion chamber.
  • the axis of rotation of the thrower wheel can, of course, also be inclined to the vertical.
  • a particularly simple embodiment of the invention provides that the upper part of the front wall of the combustion chamber is offset inwardly into the combustion chamber by means of a lowered part of the combustion chamber cover and the fuel is introduced at the top end of the upper front wall.
  • the combustion chamber cover closes off the combustion chamber on the top side and has an opening for the purpose of extracting the flue gas.
  • the burnout zone is equivalent to between 15 and 40%, in particular between 20 and 40%, of the length of the grate.
  • the method according to the invention can be employed in particular in the case of a forward-acting reciprocating grate. Unlike with a traveling grate, where the grate itself moves in the direction of conveyance, the bars of the grate, for example, remain in position and are simply moved back and forth.
  • a firing plant corresponding to the method is recited in a further independent claim.
  • Said plant comprises at least one combustion chamber, a grate disposed therein, and a mechanical spreader stoker by means of which fuel can be deposited onto the grate counter to the direction of conveyance of the grate.
  • the firing plant is characterized in that by means of the mechanical spreader stoker the fuel can be introduced immediately below the combustion chamber cover, and more specifically, viewed in the direction of conveyance of the grate, ahead of the end of the grate, with the result that during operation of the mechanical spreader stoker a burnout zone is created on the grate between the mechanical spreader stoker and the end of the grate, onto which burnout zone no fresh fuel can be deposited.
  • the burnout zone is equivalent to between 15 and 40%, in particular between 20 and 40%, of the length of the grate.
  • the grate is a forward-acting reciprocating grate.
  • a particularly simple embodiment of the firing plant provides that the upper part of the front wall of the combustion chamber is offset inwardly into the combustion chamber by means of a lowered part of the combustion chamber cover and an opening for introducing the fuel is provided at the top end of the upper front wall.
  • Said forward-acting reciprocating grate consists of individual elements having bars oriented in the direction of conveyance (in this example the bars have a length of 500 mm), with only every second element being moved back and forth.
  • the fuel 3 is supplied from above to a mechanical spreader stoker 4 and conveyed by means of the latter into the combustion chamber 1 .
  • the mechanical spreader stoker 4 has a horizontally disposed thrower wheel, i.e. the axis of rotation of the thrower wheel is vertical.
  • the fuel 3 is introduced into the mechanical spreader stoker 4 from above in the region of the hub of the thrower wheel and then conveyed horizontally outward with the aid of the blades of the thrower wheel and delivered—through openings in the mechanical spreader stoker—into the combustion chamber.
  • the axis of rotation of the thrower wheel can also be inclined to the vertical.
  • the mechanical spreader stoker 4 itself is disposed outside of the combustion chamber 1 , with the openings of the mechanical spreader stoker 4 leading into an opening 6 of the combustion chamber 1 , and more specifically in such a way that the fuel can be discharged as closely as possible below the combustion chamber cover 5 .
  • the fall curves of the fuel conveyed into the combustion chamber are represented by curves 7 .
  • the combustion chamber cover 5 is embodied at a lower level, with the result that there is space for the mechanical spreader stoker 4 above said lowered part 5 a of the combustion chamber cover 5 .
  • the opening 6 of the combustion chamber is situated in the upper front wall 8 that is to be formed as a result of the lowering.
  • the lower front wall 13 of the combustion chamber 1 remains unchanged.
  • the front wall 8 , 13 of the combustion chamber 1 is disposed vertically in this case.
  • the front wall 8 , 13 could, however, also be completely or partly disposed in an inclined attitude, in which case the vertical component should be preponderant.
  • the horizontal component is preponderant, which is to say that the wall is inclined by more than 45° to the vertical, said wall must already be associated with the combustion chamber cover 5 .
  • the combustion chamber cover 5 closes off the combustion chamber 1 on the top side and has an opening for the purpose of extracting the flue gas 9 .
  • a substantial part of the combustion chamber cover is disposed horizontally, said part in this case comprising about half the length of the grate 5 .
  • the combustion chamber cover can also have any other shape, this being dependent on the particular application, in particular on the fuel.
  • the opening for extracting the flue gas 9 can be larger or smaller.
  • the burnout zone 10 By virtue of the fact that the opening 6 for the fuel from the mechanical spreader stoker 4 is displaced inwardly into the combustion chamber counter to the direction of conveyance of the grate 5 there is created on the grate 5 the burnout zone 10 , into which no fresh fuel 7 is able to make its way directly from the mechanical spreader stoker 4 .
  • the burnout zone 10 therefore extends at least from vertically below the opening 6 , i.e. the upper front wall 8 , as far as the discharge-side end of the grate 5 . In this embodiment the burnout zone is equal to approximately one sixth of the length of the grate.
  • the fresh fuel 7 from the mechanical spreader stoker 4 can only land in the remaining section 11 of the grate 5 . Combustion therefore commences in this section 11 and continues in the burnout zone 10 until finally the ash 12 remaining at the end of the grate 5 is conveyed without post-combustion from the combustion chamber 1 .
  • a traveling grate can alternatively be used instead of a forward-acting reciprocating grate.
  • the grate does not have to be horizontal, but can also be disposed at a slightly inclined attitude, e.g. by up to 7° to the horizontal.
  • the grate can also be implemented in stages.

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)
  • Solid-Fuel Combustion (AREA)
  • Incineration Of Waste (AREA)
  • Gasification And Melting Of Waste (AREA)
US12/866,263 2008-02-21 2009-02-12 Method for mechanical stoking in firing installations and firing installation Abandoned US20100323310A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008010235.0 2008-02-21
DE102008010235A DE102008010235B4 (de) 2008-02-21 2008-02-21 Verfahren zur Wurfbeschickung bei Feuerungsanlagen und Feuerungsanlage
PCT/EP2009/051623 WO2009103655A2 (de) 2008-02-21 2009-02-12 Verfahren zur wurfbeschickung bei feuerungsanlagen und feuerungsanlage

Publications (1)

Publication Number Publication Date
US20100323310A1 true US20100323310A1 (en) 2010-12-23

Family

ID=40952804

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/866,263 Abandoned US20100323310A1 (en) 2008-02-21 2009-02-12 Method for mechanical stoking in firing installations and firing installation

Country Status (6)

Country Link
US (1) US20100323310A1 (zh)
EP (1) EP2242949B1 (zh)
CN (1) CN101946125B (zh)
CA (1) CA2716179A1 (zh)
DE (1) DE102008010235B4 (zh)
WO (1) WO2009103655A2 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150211737A1 (en) * 2014-01-27 2015-07-30 Valvexport, Inc. Automated biomass distribution system
US20180038591A1 (en) * 2014-01-27 2018-02-08 Valvexport, Inc. Automated biomass distribution system
US20180238543A1 (en) * 2017-02-23 2018-08-23 Kappes, Cassiday & Associates Sand bed downdraft furnace and activated carbon scrubber

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106382637A (zh) * 2016-11-19 2017-02-08 无锡大功机械制造有限公司 一种垃圾焚烧炉的进料装置

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2110452A (en) * 1936-05-19 1938-03-08 Riley Stoker Corp Furnace
US2493960A (en) * 1945-12-11 1950-01-10 Charles S Gladden Method and apparatus for burning fine solids
US2511935A (en) * 1950-06-20 Traveling grate stoker including
US2615406A (en) * 1949-11-12 1952-10-28 Westinghouse Electric Corp Traveling grate stoker
US2654331A (en) * 1950-05-26 1953-10-06 Detroit Stoker Co Stoker apparatus
US2794406A (en) * 1952-09-24 1957-06-04 Detroit Stoker Co Stoker apparatus
US3311090A (en) * 1965-11-26 1967-03-28 Tennessee River Pulp & Paper C Boiler apparatus for complete combustion of fuel
JPS577226A (en) * 1980-06-17 1982-01-14 Babcock Hitachi Kk Apparatus for decomposing malodorant gas and recovering waste heat
US4362269A (en) * 1981-03-12 1982-12-07 Measurex Corporation Control system for a boiler and method therefor
JPS5960104A (ja) * 1982-09-28 1984-04-06 Mitsubishi Heavy Ind Ltd 石炭燃焼炉
US4485747A (en) * 1983-07-15 1984-12-04 The United States Of America As Represented By The Environmental Protection Agency Reducing pollutant emissions by fines removal
US4528917A (en) * 1983-07-05 1985-07-16 Northwest Iron Fireman, Inc. Solid fuel burner
JPS6199019A (ja) * 1984-10-19 1986-05-17 Asahi Boiraa Kogyo Kk 固形燃料拡散投入装置
US4592289A (en) * 1983-10-18 1986-06-03 The United States Of America As Represented By The Administrator Of The Environmental Protection Agency Reducing pollutant emissions from a spreader-stoker-fired furnace by stoichiometric control
US5226375A (en) * 1991-05-22 1993-07-13 Toyo Tire & Rubber Co., Ltd. Boiler and other combustion chambers and a method for mix-combusting coal and rubber
US7017500B2 (en) * 2004-03-30 2006-03-28 International Paper Company Monitoring of fuel on a grate fired boiler

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT155349B (de) * 1937-08-24 1938-12-27 Ungarische Radiatoren Fabriks Mechanische Feuerungseinrichtung.
DE686716C (de) * 1937-11-19 1940-01-15 Alois Kulis Beschickungsvorrichtung fuer Feuerungen
GB523265A (en) * 1938-12-29 1940-07-10 Ungarische Radiatoren Fabriks Improvements in and relating to charging devices for mechanical furnaces comprising a throwing shovel
GB574829A (en) * 1944-02-18 1946-01-22 Danks Of Netherton Ltd Improvements in grates for the furnaces of boilers and the like
FR2563320B1 (fr) * 1984-04-24 1989-03-24 Stein Industrie Chaudiere pour la combustion de charbons maigres
AT412500B (de) * 2002-10-29 2005-03-25 Wilde Andreas Ing Verfahren zum verbrennen von kleinstückeligem brennstoff
AT502343B1 (de) * 2005-08-24 2007-12-15 Eisenzopf Georg Heizkessel für körnige brennstoffe
CN2864390Y (zh) * 2005-11-18 2007-01-31 朴熙英 多功能锅炉助燃器

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511935A (en) * 1950-06-20 Traveling grate stoker including
US2110452A (en) * 1936-05-19 1938-03-08 Riley Stoker Corp Furnace
US2493960A (en) * 1945-12-11 1950-01-10 Charles S Gladden Method and apparatus for burning fine solids
US2615406A (en) * 1949-11-12 1952-10-28 Westinghouse Electric Corp Traveling grate stoker
US2654331A (en) * 1950-05-26 1953-10-06 Detroit Stoker Co Stoker apparatus
US2794406A (en) * 1952-09-24 1957-06-04 Detroit Stoker Co Stoker apparatus
US3311090A (en) * 1965-11-26 1967-03-28 Tennessee River Pulp & Paper C Boiler apparatus for complete combustion of fuel
JPS577226A (en) * 1980-06-17 1982-01-14 Babcock Hitachi Kk Apparatus for decomposing malodorant gas and recovering waste heat
US4362269A (en) * 1981-03-12 1982-12-07 Measurex Corporation Control system for a boiler and method therefor
JPS5960104A (ja) * 1982-09-28 1984-04-06 Mitsubishi Heavy Ind Ltd 石炭燃焼炉
US4528917A (en) * 1983-07-05 1985-07-16 Northwest Iron Fireman, Inc. Solid fuel burner
US4485747A (en) * 1983-07-15 1984-12-04 The United States Of America As Represented By The Environmental Protection Agency Reducing pollutant emissions by fines removal
US4592289A (en) * 1983-10-18 1986-06-03 The United States Of America As Represented By The Administrator Of The Environmental Protection Agency Reducing pollutant emissions from a spreader-stoker-fired furnace by stoichiometric control
JPS6199019A (ja) * 1984-10-19 1986-05-17 Asahi Boiraa Kogyo Kk 固形燃料拡散投入装置
US5226375A (en) * 1991-05-22 1993-07-13 Toyo Tire & Rubber Co., Ltd. Boiler and other combustion chambers and a method for mix-combusting coal and rubber
US7017500B2 (en) * 2004-03-30 2006-03-28 International Paper Company Monitoring of fuel on a grate fired boiler

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150211737A1 (en) * 2014-01-27 2015-07-30 Valvexport, Inc. Automated biomass distribution system
US9835326B2 (en) * 2014-01-27 2017-12-05 Valvexport, Inc. Automated biomass distribution system
US20180038591A1 (en) * 2014-01-27 2018-02-08 Valvexport, Inc. Automated biomass distribution system
US10125985B2 (en) * 2014-01-27 2018-11-13 Valvexport, Inc. Automated biomass distribution system
US20180238543A1 (en) * 2017-02-23 2018-08-23 Kappes, Cassiday & Associates Sand bed downdraft furnace and activated carbon scrubber

Also Published As

Publication number Publication date
EP2242949B1 (de) 2018-11-14
WO2009103655A3 (de) 2010-02-25
CA2716179A1 (en) 2009-08-27
EP2242949A2 (de) 2010-10-27
DE102008010235B4 (de) 2010-07-01
CN101946125B (zh) 2012-12-05
WO2009103655A2 (de) 2009-08-27
DE102008010235A1 (de) 2009-09-17
CN101946125A (zh) 2011-01-12

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Legal Events

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AS Assignment

Owner name: SIEMENS AG OESTERREICH, AUSTRIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BAUMANN, DIETMAR;MADISPERGER, WOLFGANG;WEISS, WILLIBALD;REEL/FRAME:024792/0636

Effective date: 20100708

STCB Information on status: application discontinuation

Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION