EP0440552A2 - Installation de combustion - Google Patents

Installation de combustion Download PDF

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Publication number
EP0440552A2
EP0440552A2 EP91400212A EP91400212A EP0440552A2 EP 0440552 A2 EP0440552 A2 EP 0440552A2 EP 91400212 A EP91400212 A EP 91400212A EP 91400212 A EP91400212 A EP 91400212A EP 0440552 A2 EP0440552 A2 EP 0440552A2
Authority
EP
European Patent Office
Prior art keywords
grate structure
combustion unit
fluidized bed
unit according
chamber
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.)
Ceased
Application number
EP91400212A
Other languages
German (de)
English (en)
Other versions
EP0440552A3 (en
Inventor
Jouni Kinni
Seppo Ruottu
Paavo Hyöty
Pentti Janka
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.)
Tampella Power Oy
Original Assignee
Tampella Power Oy
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 Tampella Power Oy filed Critical Tampella Power Oy
Publication of EP0440552A2 publication Critical patent/EP0440552A2/fr
Publication of EP0440552A3 publication Critical patent/EP0440552A3/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F23C10/24—Devices for removal of material from the bed

Definitions

  • the invention relates to a combustion unit of the type comprising a reactor chamber in combination with at least one particle separator for the purpose of obtaining a circulation process.
  • the lower part of the reactor chamber is provided with a grate structure for forming a so-called fluidized bed, the grate structure having means for supplying fuel, means for removing coarse material of the fluidized bed from the grate structure and means for supplying air to the grate structure.
  • the particle separator can have a structure of a so-called cyclone separator where there are two casings, one placed essentially inside the other, the casings having parallel and essentially coincident centre lines. The first, i.e.
  • the outer casing is provided with an inlet for the flue gases generated in the fluidized bed of the reactor chamber and which contain solid material, and at least one return duct for the solid material, which is separated in the particle separator.
  • the return duct leads to the proximity of the grate structure of the reactor chamber for returning the solid material back to the fluidized bed.
  • the second, i.e. the inner casing is connected to the subsequent process stage for carrying the flue gases essentially free of solid material through said inner casing to said process stage subsequent to combustion.
  • the wall structure of the reactor chamber is usually arranged to form essentially a heat transfer surface comprising a tubular structure and flow of a heat transfer medium is arranged inside the tubular structure.
  • Combustion units of the above type exist in several different constructions. Usually the particle separator is placed outside the reactor chamber. But it is a known practice to place the particle separator inside the reactor chamber. The present invention can be applied to both basic constructions.
  • the combustion unit according to this invention is mainly characterized in that the means for supplying fuel to the grate structure and the means for removing the coarse material in the fuel are formed in at least one group which penetrates the grate structure essentially at a same point.
  • the outlet opening of the return duct coming from the particle separator, for the coarse material is placed on top of at least one of the aforementioned groups.
  • the reference number 1 shows a cooled part of the grate structure in the reactor chamber R, which part is provided with an opening 2 delimited by an annular feed chamber 4 which engages with the cooling tubes 3 of the grate structure.
  • the annular feed chamber 4 is used when the heat transfer medium is fed to the return duct.
  • the opening 2 below the grate structure 1 is provided with a casing 5, on the exterior of which is formed an air distribution space 6, within the reactor chamber.
  • the combustion air is transferred from the air distribution space 6 through the nozzles penetrating the grate structure to the upper side thereof, into the fluidized bed (not shown).
  • a vertical feed pipe 7 penetrating the bottom of the reactor chamber is led through the casing 5, and terminates at a distribution chamber 8, at the level of the grate structure 1.
  • four essentially horizontal fuel supply pipes 9 extend from the sides of the distribution chamber casing. These fuel supply pipes are located vertically above the grate structure 1 and placed at 90° with respect to each other as seen from above.
  • the lower part of the feed pipe 7 is provided with a separator unit 10 for obtaining a fuel feed of a suitable composition.
  • Parts 7, 8, and 9 constitute the means for supplying fuel to the grate structure essentially in a radial direction relative to the longitudinal direction of the feed pipe 7,
  • the discharge pipe 11 for the coarse material which has a conically shaped upper part, extends from the plane of the upper side 1a of the grate structure 1, which is covered with a ceramic material, at the point where the feed chamber 4 is located, and the lower part of the discharge pipe 11 extends inside the casing 5 to a pressurized chamber 12 by means of which the finer material among the coarse material is returned back to the fluidized bed utilizing a so-called counter flow separation principle.
  • the lower part of the pressurized chamber 12 is provided with a discharge pipe 13 for the coarse material and a blowpipe 14 for blowing the gaseous pressure medium into the pressurized chamber 12 as required by the principle of counter flow separation.
  • the discharge pipe 11 surrounds the feed pipe 7 and therefore the coarse material goes out through an annular duct formed therewith. It is to be noted that the feed pipe 7 is also placed inside the pressurized chamber 12.
  • the outlet opening of the return duct 15 is placed above the distribution chamber 8 at a distance from its upper surface or the like.
  • the return duct 15 is configured as a heat transfer surface.
  • Vertical feed pipes 16 (4 pipes) lead from the feed chamber 4 upwards to an annular distribution chamber 17 at the lower part of the return duct 15.
  • the return duct 15 for the solid material can advantageously be a vertical tube whose upper end is connected to the lower part of the cyclone separator, whereupon its centre line essentially coincides with the centre line of the reactor chamber R.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
EP19910400212 1990-01-29 1991-01-29 Combustion unit Ceased EP0440552A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI900437A FI85758C (fi) 1990-01-29 1990-01-29 Foerbraenningsanlaeggning.
FI900437 1990-01-29

Publications (2)

Publication Number Publication Date
EP0440552A2 true EP0440552A2 (fr) 1991-08-07
EP0440552A3 EP0440552A3 (en) 1992-06-03

Family

ID=8529790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910400212 Ceased EP0440552A3 (en) 1990-01-29 1991-01-29 Combustion unit

Country Status (3)

Country Link
EP (1) EP0440552A3 (fr)
FI (1) FI85758C (fr)
RU (1) RU1838720C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212177C2 (de) * 1991-04-11 2002-08-01 Kvaerner Pulping Oy Tampere Verbrennungsanlage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1340345A (en) * 1970-12-23 1973-12-12 Coal Industry Patents Ltd Fluidised bed apparatus
GB2070960B (en) * 1980-01-15 1984-06-06 Flameless Furnaces Ltd Fluidised bed combustors
DE3375197D1 (en) * 1982-03-31 1988-02-11 Foster Wheeler Energy Corp Fluidized bed heat exchanger
GB2128573A (en) * 1982-10-22 1984-05-02 British Petroleum Co Plc Non-mechanical valve for particulate material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212177C2 (de) * 1991-04-11 2002-08-01 Kvaerner Pulping Oy Tampere Verbrennungsanlage

Also Published As

Publication number Publication date
RU1838720C (ru) 1993-08-30
FI85758B (fi) 1992-02-14
FI900437A0 (fi) 1990-01-29
FI900437A7 (fi) 1991-07-30
FI85758C (fi) 1992-05-25
EP0440552A3 (en) 1992-06-03

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