EP1106921A1 - Procédé de fonctionnement d' une grille vibrante dans un foyer à biomasse - Google Patents

Procédé de fonctionnement d' une grille vibrante dans un foyer à biomasse Download PDF

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Publication number
EP1106921A1
EP1106921A1 EP99124587A EP99124587A EP1106921A1 EP 1106921 A1 EP1106921 A1 EP 1106921A1 EP 99124587 A EP99124587 A EP 99124587A EP 99124587 A EP99124587 A EP 99124587A EP 1106921 A1 EP1106921 A1 EP 1106921A1
Authority
EP
European Patent Office
Prior art keywords
grate
vibrating
vibration
period
accordance
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.)
Withdrawn
Application number
EP99124587A
Other languages
German (de)
English (en)
Inventor
Svend O. Kristensen
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.)
Babcock and Wilcox Volund AS
Original Assignee
Babcock and Wilcox Volund AS
Ansaldo Volund AS
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 and Wilcox Volund AS, Ansaldo Volund AS filed Critical Babcock and Wilcox Volund AS
Priority to EP99124587A priority Critical patent/EP1106921A1/fr
Priority to AU18516/01A priority patent/AU1851601A/en
Priority to PCT/DK2000/000676 priority patent/WO2001042710A1/fr
Publication of EP1106921A1 publication Critical patent/EP1106921A1/fr
Withdrawn legal-status Critical Current

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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 material 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 In combustion chambers of this kind, 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.
  • a controlled vibrating of the grate at controlled repetition frequency, and the repetition frequency can be chosen sufficiently high to keep CO emission substantially constant and below certain limits during the whole combustion process, including the vibrating operation without substantially changing the supply of fuel, primary air and secondary air.
  • 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, the engagement between the drive axle 14 and the ring 15 is released and the springs 3 and the possible spring 13 will drive the ring 15 to the opposite dead point position.
  • the drive axle 14 rotates slowly onwards and during the next half revolution, the spring 13 is tensioned and after this half turn, the drive axle 14 again engages the ring construction 15.
  • the movement of the vibrating grate 2 will be as shown in Figure 5, when using this drive mechanism, where Figure 5 shows the movement of the grate 2 as a function of time.
  • 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)
EP99124587A 1999-12-09 1999-12-09 Procédé de fonctionnement d' une grille vibrante dans un foyer à biomasse Withdrawn EP1106921A1 (fr)

Priority Applications (3)

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

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
EP1106921A1 true EP1106921A1 (fr) 2001-06-13

Family

ID=8239569

Family Applications (1)

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

Country Status (3)

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

Cited By (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
CN110848720A (zh) * 2019-11-26 2020-02-28 沈娜 秸秆的燃烧回收利用装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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 (3)

* 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
CN110848720A (zh) * 2019-11-26 2020-02-28 沈娜 秸秆的燃烧回收利用装置
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

Also Published As

Publication number Publication date
WO2001042710A1 (fr) 2001-06-14
AU1851601A (en) 2001-06-18

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