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EP0052499A2 - Fours - Google Patents

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Publication number
EP0052499A2
EP0052499A2 EP81305403A EP81305403A EP0052499A2 EP 0052499 A2 EP0052499 A2 EP 0052499A2 EP 81305403 A EP81305403 A EP 81305403A EP 81305403 A EP81305403 A EP 81305403A EP 0052499 A2 EP0052499 A2 EP 0052499A2
Authority
EP
European Patent Office
Prior art keywords
grate
rake
blade
solid fuel
ash
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Withdrawn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
EP81305403A
Other languages
German (de)
English (en)
Other versions
EP0052499A3 (fr
Inventor
Jack Donald Wells
Colin French
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.)
H SAACKE Ltd
Original Assignee
H SAACKE 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
Application filed by H SAACKE Ltd filed Critical H SAACKE Ltd
Publication of EP0052499A2 publication Critical patent/EP0052499A2/fr
Publication of EP0052499A3 publication Critical patent/EP0052499A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F23J1/06—Mechanically-operated devices, e.g. clinker pushers

Definitions

  • This invention relates to furnaces and in particular to the removal of ash from the grate of solid fuel furnaces.
  • ash is removed from the grate of such a furnace either by manual raking or by using a travelling, reciprocating or vibrating grate to cause the ash to travel along or through the grate into an ash receiving space.
  • One known prior art device is the so-called travelling grate stoker.
  • coal is fed on to a travelling grate and once the coal reaches the grate it is ignited from its top surface by radiation from above The coal then burns down from the top surface and under ideal conditions, the coal is completely burnt when the end of the grate is reached.
  • the ash then drops off the grate into an ash bed laying beneath the end of the grate. The ash is removed from the furance on a conveyor or by means of a screw.
  • Another known device is the so called drop tube or front spread fixed grate stoker.
  • the grate is fixed and coal is fed from above.
  • the burner system is automatic in operation for up to twelve hours, but after this time, the ash has to be removed manually from the grate.
  • a further known device which also requires the manual removal of ash is a so called coking stoker. Coal is pushed into the furnace by a ram and is moved down the furnace by cam driven movement of the grate bars.
  • a solid fuel furnace having a fixed fuel grate, a mechanical rake and a control mechanism for moving the rake relative to the grate to displace the ash and fuel on the grate.
  • the operation of the control mechanism is automatic and takes place periodically.
  • a solid fuel furnace comprises a grate, a mechanical rake for displacing the ash on the fuel bed or the grate and means for controlling the rake to displace a first section of the bed on the grate by an increment and subsequently to displace successive sections by a corresponding increment, each section thereby occupying a position on the grate vacated by the previously displaced section.
  • FIG 1 shows a typical firebed after some hours running without de-ashing.
  • Solid fuel usually coal
  • a feed tube 12 which may be in any position in the furnace wall but is illustrated as entering the furnace in the top right hand corner as viewed.
  • the coal is fed onto a grate upon which it is mixed with combustion air and burnt.
  • Figure 1 it can be seen that if the firebed runs without de-ashing, a considerable layer 16 of ash builds up on the grate and a thinner layer 18 of coal rests on top of the ash layer 16. The ash builds up in depths at more or less the same rate over the entire length and width of the grate.
  • Figure 2 shows how a mechanical rake, generally .designated 20 and comprising a rake blade 22 and a rake boom 24 may be used to remove ash from the grate 14.
  • the rake 20 may pull, as shown in the right hand portion of Figure 2, or push as shown in the left hand portion of Figure 2, the fuel and ash bed 17 along the grate into an ash receptacle 26.
  • the ash may be subsequently removed from the receptacle 26 by manual, mechanical, hydraulic or pneumatic means.
  • the rake 20 may be operated in any of a variety of ways. In a first method of operation, the rake may simply move the fuel and ash bed 17 progressively down the grate. In a second alternative mode, the rake may be used to move the live fuel to the back or the front of the grate, then rake out the whole of the ash, and then redistribute the live fuel evenly on the grate.
  • the whole of the ash and live fuel may be raked out.
  • the rake may be arranged to rake the fuel and ash bed in strips longitudinally along the grate by subdividing the rake into small sections whereby when new fuel is placed on the grate it can be reignited from the adjacent sections.
  • the rake 20 may have a plane end as shown in Figure 2, or it may be bucket shaped to prevent sideways movement of the ash.
  • the rake blade 22 is pivoted along its length to provide a variable incidence or penetration into the ash and fuel bed and to allow the blade to be pivoted so as to pass above the fuel and ash bed without disturbing the bed when desired.
  • Such an arrangement of a pivoted blade is shown in Figure 4.
  • the blade may be pivoted around pivot 30 to vary the angle of incidence of the rake blade on the fuel and ash bed.
  • Figure 2 also shows the guide system for the rake boom 24.
  • the Figure shows a simple tubular guide system 30 and the boom 24 may be driven mechanically, pneumatically or hydraulically.
  • one, two or more-rakes 20 may be employed in the furnace 10.
  • the rake 20 may be driven or manually repositioned sideways to avoid the use of multiple rakes.
  • the furnace 10 may be pressurised, or may operate at atmospheric or sub-atmospheric pressure.
  • the mechanical rake system may be air, gas or liquid cooled in order to be able to withstand the high temperatures within the furnace 10.
  • Figure 3 shows an air cooled blade and boom.
  • a cooling air inlet 34 is provided in the boom 24 and the air runs along the boom, into the blade 22 and passes from the lower end of the blade 22 onto the grate 14.
  • the rake system may be made from heat resistant material.
  • FIG. 5 A system for incremental removal of the ash from the furnace is illustrated in Figure 5.
  • the rake 20 periodically completes a cycle. as follows:
  • a variable incidence rake blade permits the blade to be lifted over ash undisturbed as the rake advances. It is to be noted that such an incremental system of ash removal could be used at the other end of the grate 14, in which case the rake will act upon the ash increment by pushing rather than pulling.
  • variable incidence blade Another feature of the variable incidence blade described in respect of Figure 4 is that movement of the ash and feed bed 17 is permitted to produce desired movements and levels in the bed.
  • Alternative sequences of operation include lateral movement of the ash either by sideways movement of the whole rake and boom or the attachment of variable end fixed incidence side blades to the rake end fixed either to the blade 20 or boom 24.
  • Such side blades (41) are shown in Figures 2a and 2b.
  • the side blades 41 are fluid cooled.
  • Yet another variation would allow the rake to rotate on its axis by 90 degrees so that the incidence of'the blade would provide a sideways component to the ash.
  • the ash may be removed through a narrow exit which is advantageous in furnace applications.
  • the rake boom 24 may be telescopic to reduce the space requirements of the system.
  • the rake may be provided with a roller which keeps the rake at a prescribed distance above the grate.
  • the whole boom 24 could be pivoted at the entrance 40 to the furnace.
  • the whole rake could be pivoted and raised above the ash and fuel bed 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Gasification And Melting Of Waste (AREA)
EP81305403A 1980-11-18 1981-11-16 Fours Withdrawn EP0052499A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8036961 1980-11-18
GB8036961 1980-11-18

Publications (2)

Publication Number Publication Date
EP0052499A2 true EP0052499A2 (fr) 1982-05-26
EP0052499A3 EP0052499A3 (fr) 1982-09-15

Family

ID=10517389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305403A Withdrawn EP0052499A3 (fr) 1980-11-18 1981-11-16 Fours

Country Status (2)

Country Link
EP (1) EP0052499A3 (fr)
AU (1) AU7758581A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2566099A1 (fr) * 1984-06-13 1985-12-20 Socea Balency Sobea Four d'incineration de dechets menagers et industriels
FR2587093A1 (fr) * 1985-09-12 1987-03-13 Elf France Dispositif d'alimentation d'une chaudiere a combustible solide et de nettoyage de la grille de la chaudiere
EP1559957A1 (fr) 2004-01-28 2005-08-03 Thermorossi S.P.A. Brûleur de fourneau pour l'incinération de boulettes, de copeaux de bois, de céréales et de déchets végétaux en général
WO2009019569A3 (fr) * 2007-08-03 2009-04-30 Termocabi Srl Dispositif d'élimination des matériaux résiduels agglomérés générés par la combustion de boulettes ou de combustible solide en général
CN106958826A (zh) * 2016-01-11 2017-07-18 沈阳兰昊新能源科技有限公司 卧式旋风炉膛的自动除渣系统和具有其的燃料锅炉

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE248140C (fr) *
DE292947C (fr) *
US1736196A (en) * 1927-05-18 1929-11-19 Henry W Grosnickle Clinker fork
CH244551A (de) * 1945-04-30 1946-09-30 Bbc Brown Boveri & Cie Schlackenräumeinrichtung.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2566099A1 (fr) * 1984-06-13 1985-12-20 Socea Balency Sobea Four d'incineration de dechets menagers et industriels
FR2587093A1 (fr) * 1985-09-12 1987-03-13 Elf France Dispositif d'alimentation d'une chaudiere a combustible solide et de nettoyage de la grille de la chaudiere
EP1559957A1 (fr) 2004-01-28 2005-08-03 Thermorossi S.P.A. Brûleur de fourneau pour l'incinération de boulettes, de copeaux de bois, de céréales et de déchets végétaux en général
WO2009019569A3 (fr) * 2007-08-03 2009-04-30 Termocabi Srl Dispositif d'élimination des matériaux résiduels agglomérés générés par la combustion de boulettes ou de combustible solide en général
CN106958826A (zh) * 2016-01-11 2017-07-18 沈阳兰昊新能源科技有限公司 卧式旋风炉膛的自动除渣系统和具有其的燃料锅炉

Also Published As

Publication number Publication date
AU7758581A (en) 1982-05-27
EP0052499A3 (fr) 1982-09-15

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Inventor name: WELLS, JACK DONALD

Inventor name: FRENCH, COLIN