EP4584535A1 - Combustion induite par tourbillon dans des systèmes à lit fluidisé circulant - Google Patents

Combustion induite par tourbillon dans des systèmes à lit fluidisé circulant

Info

Publication number
EP4584535A1
EP4584535A1 EP22958019.6A EP22958019A EP4584535A1 EP 4584535 A1 EP4584535 A1 EP 4584535A1 EP 22958019 A EP22958019 A EP 22958019A EP 4584535 A1 EP4584535 A1 EP 4584535A1
Authority
EP
European Patent Office
Prior art keywords
furnace
cfb
injection ports
fuel
combustion air
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.)
Pending
Application number
EP22958019.6A
Other languages
German (de)
English (en)
Inventor
Edgar Gasafi
Robert MADUTA
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.)
Metso Metals Oy
Original Assignee
Metso Metals 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 Metso Metals Oy filed Critical Metso Metals Oy
Publication of EP4584535A1 publication Critical patent/EP4584535A1/fr
Pending legal-status Critical Current

Links

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
    • F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion

Definitions

  • a process for heating and/or calcination of a material is further disclosed .
  • the process may comprise that the inj ection ports for combustion fuel and secondary combustion air are arranged to induce swirling in the furnace .
  • the combustion air may be preheated prior to injection into the CFB furnace.
  • preheated combustion air is injected on one or more levels in the furnace from several injection nozzles as secondary air in addition to primary air which is injected from the bottom via the nozzle grate.
  • the fuel is fed into the bottom part of the furnace, at a height [3 of max 1.5 m above the floor/nozzle grate, or lower than 1.2 m and or lower than 0.9 m above the floor.
  • the height [3 is measured from the level of the floor or nozzle grate of the CFB furnace .
  • secondary air is injected into the furnace on one or more levels in the furnace from several injection nozzles.
  • the nozzle/lance exit velocity of the fuel injected into the furnace is below 150 m/s or below 100 m/s . In certain embodiments, the nozzle/lance exit velocity of the fuel injected into the furnace is above 10 m/s.
  • Fig. 3 to 10 show a top view of a CFB furnace according to the present specification.
  • the injection ports for fuel (1) are arranged at an angle 5 of -5 to +30° relative to the injection ports for combustion air (2) as illustrated in Figs. 4 and 6.
  • the negative direction of the angle is defined as the injection ports for fuel (1) being angled toward the center of the furnace compared to the injection ports for air.
  • the positive direction of the angle is defined as the injection ports for fuel (1) being angled toward the perimeter of the furnace, away from the center, compared to the injection ports for air.
  • Figs. 9 and 10 present embodiments of a CFB furnace according to the present disclosure, where air guides have been retrofitted in injection ports to alter the direction of the gases fed into the CFB furnace, thereby introducing swirling.
  • the injection ports are arranged at an angle a of 0 to 30° relative to each other as illustrated in Fig. 10.
  • Figs. 12 and 13 further illustrate the effect of inducing swirl on the flow of gases in a CFB furnace.
  • Fig. 12 presents a conventional arrangement, where the fuel and secondary combustion air are fed into the CFB furnace without inducing swirling.
  • Fig. 13 illustrates a situation where the feeding of the gases into the CFB furnace introduces swirling in the furnace during operation. In Fig. 12, both gases flow nearly directly to the top of the furnace and exit there, whereas in Fig. 13, the swirling increases the distance traveled within the furnace and therefore also the residence time of the gases and the particles carried by the gases.
  • the injection ports for combustion fuel and primary combustion air are arranged in the lower part of the furnace where the volume fraction of particles is high.
  • the injection ports are arranged upwards or downwards at an angle of 90° + /- 45°, or 90° +/-35°, or 90° +/-20° relative to the vertical axis of the furnace.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Dispersion Chemistry (AREA)

Abstract

L'invention concerne un four à lit fluidisé circulant (CFB) pour le chauffage et la calcination d'un matériau, les orifices d'injection pour le combustible de combustion (1) et l'air de combustion secondaire (2) étant agencés pour induire un tourbillonnement dans le four. L'invention concerne un procédé de chauffage et/ou de calcination d'un matériau, les orifices d'injection pour le combustible de combustion (1) et l'air de combustion secondaire (2) étant agencés pour induire un tourbillonnement dans le four.
EP22958019.6A 2022-09-08 2022-09-08 Combustion induite par tourbillon dans des systèmes à lit fluidisé circulant Pending EP4584535A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2022/050599 WO2024052591A1 (fr) 2022-09-08 2022-09-08 Combustion induite par tourbillon dans des systèmes à lit fluidisé circulant

Publications (1)

Publication Number Publication Date
EP4584535A1 true EP4584535A1 (fr) 2025-07-16

Family

ID=90192149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22958019.6A Pending EP4584535A1 (fr) 2022-09-08 2022-09-08 Combustion induite par tourbillon dans des systèmes à lit fluidisé circulant

Country Status (4)

Country Link
EP (1) EP4584535A1 (fr)
AU (1) AU2022477320A1 (fr)
CA (1) CA3265568A1 (fr)
WO (1) WO2024052591A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB960863A (en) * 1960-09-13 1964-06-17 Dessau Zementanlagenbau Veb Process for the calcination of raw silicate material
FI100064B (fi) * 1995-10-20 1997-09-15 Imatran Voima Oy Menetelmä ja sovitelma leijukerroskattilan leijukerroksen lämpötilan s äätämiseksi

Also Published As

Publication number Publication date
WO2024052591A1 (fr) 2024-03-14
AU2022477320A1 (en) 2025-03-13
CA3265568A1 (fr) 2024-03-14

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