WO2001042710A1 - Procede permettant de faire fonctionner une grille oscillante dans une centrale alimentee a la biomasse - Google Patents

Procede permettant de faire fonctionner une grille oscillante dans une centrale alimentee a la biomasse Download PDF

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Publication number
WO2001042710A1
WO2001042710A1 PCT/DK2000/000676 DK0000676W WO0142710A1 WO 2001042710 A1 WO2001042710 A1 WO 2001042710A1 DK 0000676 W DK0000676 W DK 0000676W WO 0142710 A1 WO0142710 A1 WO 0142710A1
Authority
WO
WIPO (PCT)
Prior art keywords
grate
vibrating
vibration
period
accordance
Prior art date
Application number
PCT/DK2000/000676
Other languages
English (en)
Inventor
Svend O. Kristensen
Original Assignee
Babcock & Wilcox Vølund Aps
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 Babcock & Wilcox Vølund Aps filed Critical Babcock & Wilcox Vølund Aps
Priority to AU18516/01A priority Critical patent/AU1851601A/en
Publication of WO2001042710A1 publication Critical patent/WO2001042710A1/fr

Links

Classifications

    • 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
    • F23G5/002—Incineration of waste; Incinerator constructions; Details, accessories or control therefor characterised by their grates
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H9/00—Revolving-grates; Rocking or shaking grates
    • F23H9/04—Grates rocked as a whole
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2203/00—Furnace arrangements
    • F23G2203/107—Furnace arrangements with vibrating grate

Definitions

  • the present invention relates to a method of operating a vibrating grate for use in a combustion chamber for firing mate ⁇ al such as biomass.
  • the grate is mounted in the combustion chamber to perform a mainly reciprocating movement and is connected to a drive mechanism for vibrating the grate
  • the vibration intermittently it is known to perform the vibration intermittently It is possible to use the repetition frequency of the intermittent vibration as one parameter for controlling the combustion
  • the typical cycle of such intermittent vibration has been approximately 5-20 seconds of vibrating at approximately 5-30 minutes intervals
  • the vibrating frequency has typically been in the range of 5-15 hertz, depending on the fuel and the thermal load of the grate
  • the vibrating frequency is typically chosen in consideration of the transport capability of the grate
  • the natural frequency of the mechanical system consisting of vibrating grate, combustible material on the grate and the springs supporting the grate is dimensioned to be close to the vibrating frequency needed to provide this transport capability If desired, external springs may be provided to enable an adjustment of the natural frequency
  • Figure 2 schematically shows details of a drive mechanism suitable for performing the method in accordance with the invention
  • Figures 3 and 4 schematically show variants of a drive mechanism
  • Figures 5 and 6 schematically show different possible vibration schemes for the vibrating grate.
  • the combustion plant shown in Figure 1 is suited to operate in accordance with the present invention.
  • the combustion plant 1 comprises a -vibrating grate 2 supported on leaf springs 3 allowing the vibrating grate 2 to perform a reciprocating vibrating movement.
  • a drive mechanism 5 is connected to the vibrating grate 2 through a drive rod 6, said drive mechanism 5 providing the reciprocating movement of the grate 2.
  • Combustible material is supplied to the grate 2 through an air spout 4 and the combustible material is transported down the vibrating grate 2 by the vibration of the grate.
  • Primary air 8 for the combustion of the combustible material on the grate 2 is supplied through openings in the grate 2.
  • the grate 2 is positioned in a combustion chamber 7 and secondary air 9 is supplied into the combustion chamber 7 via nozzles provided in said chamber.
  • the hot gases supply energy to a boiler for absorption of the energy from the hot gases.
  • the combustible material on the vibrating grate 2 is transported down the vibrating grate 2 by the vibration, which also conveys the ashes from the combustion to the slag chute 11. Furthermore, the vibration provides a distribution and mixing of the fuel positioned on the vibrating grate.
  • the normal vibration scheme used for such a vibrating grate comprises vibrating the grate 2 intermittently.
  • a typical vibration period is approximately 5-20 seconds at a frequency of 5-15 hertz, i.e. between 25 and 300 full cycles of vibrating, followed by a standstill period of 5-30 minutes.
  • This vibrating scheme provides a substantial change in the combustion of the fuel on the vibrating grate during vibration, as the combustible material is mixed and volatile combustibles are released from the fuel on the grate, thereby significantly increasing the combustion rate and the consumption of oxygen inside the combustion chamber 7 during and immediately following the vibration.
  • the vibration is performed in sufficiently short periods, e.g. only providing five or less full cycles of reciprocating movement of the grate
  • the standstill periods between the vibrating procedures will naturally have to be reduced correspondingly to approximately 10-120 seconds
  • the drive mechanism schematically shown in Figure 2 is constructed to be able to perform the vibration in accordance with the present invention with only one full cycle of reciprocating movement of the grate for each vibrating period
  • the drive mechanism comprises a drive axle 14 with a one-way engagement construction engaging a rotatably mounted ring 15, said ring 15 being connected as a crank mechanism with the drive rod 6 connected to the vibrating grate 2, the connection being provided by means of a connection rod 12
  • a supplementary spring mechanism is provided between the drive axle 14 and the ring 15 said spring 13 providing a supplementary force which may be adjustable, said spring force supplementing the spring force of the leaf springs 3 shown in Figure 1 or similar springs
  • the mechanism 5 shown in Figure 2 functions in the following way
  • the drive axle 14 rotates and engages the ring 15 whereby the ring is rotated and the connection rod 12 and drive rod 6 pull the vibrating grate 2 in a first direction, whereby the leaf springs 3 are tensioned
  • the crank mechanism 12,15 passes the dead point of the crank mechanism
  • Figure 3 shows a piston-cylinder drive unit 16 connected to the vibrating grate 2 via a drive rod 6'.
  • a spring mechanism is integrated in the piston-cylinder unit to move the piston in one direction.
  • This piston-cylinder-drive unit 16 may provide a movement scheme as shown in Figure 5 or alternatively a scheme comprising more than one single stroke for each vibrating period, e.g. as shown in Figure 6.
  • the driving is performed by pumping fluid into the piston-cylinder unit, whereby the piston and the grate 2 are moved against the spring force of the spring mechanism 3'. After a certain movement of the grate, the fluid pressure in the piston cylinder unit is released, whereby the grate is moved backwards by the forces of the spring mechanism 3'.
  • Figure 4 shows yet another drive mechanism, where a cam surface 17 influences a cam follower connected to the drive rod 6" for moving the vibrating grate 2 against the forces of a spring mechanism 3".

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Wood Science & Technology (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Incineration Of Waste (AREA)

Abstract

La présente invention concerne un procédé permettant de faire fonctionner une grille oscillante (2) dans une centrale alimentée à la biomasse, ledit procédé comprenant l'oscillation de ladite grille pendant une courte durée puis le repos de celle-ci pendant une durée sensiblement supérieure. L'incinération de la matière combustible (4) au-dessus de la grille est commandée par l'alimentation en air primaire (8) à travers des ouvertures pratiquées dans la grille oscillante et en air secondaire (9) provenant de buses situées dans les parois de la chambre de combustion, par la quantité de matière combustible disposée sur la grille, et par la fréquence de répétition des oscillations intermittentes de la grille oscillante. Grâce à l'oscillation de la grille oscillante pendant des durées suffisamment courtes et à une fréquence de répétition correspondante élevée, le taux d'émissions de monoxyde de carbone et leurs fluctuations peuvent être maintenues en dessous de certaines limites.
PCT/DK2000/000676 1999-12-09 2000-12-07 Procede permettant de faire fonctionner une grille oscillante dans une centrale alimentee a la biomasse WO2001042710A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18516/01A AU1851601A (en) 1999-12-09 2000-12-07 Method of operating a vibrating grate in a biomass-fired plant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP99124587A EP1106921A1 (fr) 1999-12-09 1999-12-09 Procédé de fonctionnement d' une grille vibrante dans un foyer à biomasse
EP99124587.9 1999-12-09

Publications (1)

Publication Number Publication Date
WO2001042710A1 true WO2001042710A1 (fr) 2001-06-14

Family

ID=8239569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2000/000676 WO2001042710A1 (fr) 1999-12-09 2000-12-07 Procede permettant de faire fonctionner une grille oscillante dans une centrale alimentee a la biomasse

Country Status (3)

Country Link
EP (1) EP1106921A1 (fr)
AU (1) AU1851601A (fr)
WO (1) WO2001042710A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103742923A (zh) * 2014-01-15 2014-04-23 重庆科技学院 顺逆推炉排综合导轨装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014006459A1 (fr) * 2012-07-06 2014-01-09 Babcock & Wilcox Vølund A/S Foyer mécanique à grille vibrante
CN110848720B (zh) * 2019-11-26 2021-04-30 杭州临安简诚办公用品有限公司 秸秆的燃烧回收利用装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB686590A (en) * 1948-08-20 1953-01-28 Fr De Const Mecaniques Soc Improved shaking grate for boilers and other heating devices
DE3907463C1 (en) * 1989-03-08 1990-03-29 L. & C. Steinmueller Gmbh, 5270 Gummersbach, De Oscillating grate furnace
EP0754907A2 (fr) * 1995-07-18 1997-01-22 BURMEISTER & WAIN ENERGI A/S Procédé pour contrÔler la combustion dans une chaudière à grille vibrante

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB686590A (en) * 1948-08-20 1953-01-28 Fr De Const Mecaniques Soc Improved shaking grate for boilers and other heating devices
DE3907463C1 (en) * 1989-03-08 1990-03-29 L. & C. Steinmueller Gmbh, 5270 Gummersbach, De Oscillating grate furnace
EP0754907A2 (fr) * 1995-07-18 1997-01-22 BURMEISTER & WAIN ENERGI A/S Procédé pour contrÔler la combustion dans une chaudière à grille vibrante

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103742923A (zh) * 2014-01-15 2014-04-23 重庆科技学院 顺逆推炉排综合导轨装置
CN103742923B (zh) * 2014-01-15 2016-08-17 重庆科技学院 顺逆推炉排综合导轨装置

Also Published As

Publication number Publication date
EP1106921A1 (fr) 2001-06-13
AU1851601A (en) 2001-06-18

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