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1. (WO1997015784) METHOD AND APPARATUS FOR CONTROLLING THE TEMPERATURE OF THE BED OF A BUBBLING BED BOILER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/015784 International Application No.: PCT/FI1996/000553
Publication Date: 01.05.1997 International Filing Date: 18.10.1996
Chapter 2 Demand Filed: 10.04.1997
IPC:
F23C 7/00 (2006.01) ,F23C 9/00 (2006.01) ,F23C 10/02 (2006.01) ,F23C 10/20 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23
COMBUSTION APPARATUS; COMBUSTION PROCESSES
C
METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR
7
Combustion apparatus characterised by arrangements for air supply
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23
COMBUSTION APPARATUS; COMBUSTION PROCESSES
C
METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR
9
Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23
COMBUSTION APPARATUS; COMBUSTION PROCESSES
C
METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR
10
Apparatus in which combustion takes place in a fluidised bed of fuel or other particles
02
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
23
COMBUSTION APPARATUS; COMBUSTION PROCESSES
C
METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR
10
Apparatus in which combustion takes place in a fluidised bed of fuel or other particles
18
Details; Accessories
20
Inlets for fluidisation air, e.g. grids; Bottoms
Applicants:
IMATRAN VOIMA OY [FI/FI]; Malminkatu 16 FIN-00100 Helsinki, FI (AllExceptUS)
RAIKO, Markku [FI/FI]; FI (UsOnly)
HULKKONEN, Seppo [FI/FI]; FI (UsOnly)
HIRVENOJA, Jukka [FI/FI]; FI (UsOnly)
Inventors:
RAIKO, Markku; FI
HULKKONEN, Seppo; FI
HIRVENOJA, Jukka; FI
Agent:
LAINE, Seppo ; Seppo Laine Oy Lönnrotinkatu 19 A FIN-00120 Helsinki, FI
Priority Data:
95501120.10.1995FI
Title (EN) METHOD AND APPARATUS FOR CONTROLLING THE TEMPERATURE OF THE BED OF A BUBBLING BED BOILER
(FR) PROCEDE PERMETTANT D'AGIR SUR LA TEMPERATURE DU LIT D'UNE CHAUDIERE A LIT EN EBULLITION ET APPAREIL CORRESPONDANT
Abstract:
(EN) The present invention relates to a method and assembly for controlling the bed temperature in a fluidized-bed boiler, particularly in boilers fired with coal or other fuels of high heat value but difficult to gasify. Above the fluidized bed (6), but below the freeboard (8), is arranged a cooling zone (19) and the fluidizing gas is injected into a portion of the bed at an excess rate per unit area, whereby over the area of increased fluidizing gas injection, the bed is expanded upward into the cooling zone, wherefrom unburned combustible material and the particulate matter of the bed can fall back in the bed. The gas injection (9) with the higher flow rate is arranged to the center of the fluidized bed, whereby the return circulation can occur past the waterwall portions enclosing the cooling zone, thus facilitating efficient heat transfer from the refluxed bed material in the form of radiation absorbed by the heat transfer surfaces of the cooling zone waterwalls.
(FR) Cette invention a trait à un procédé ainsi qu'à l'appareillage correspondant permettant d'agir sur la température du lit d'une chaudière à lit fludisé, notamment de chaudières au charbon ou utilisant d'autres combustibles à pouvoir calorifique élevé mais d'un gaséification difficile. Une zone de refroidissement (19) est ménagée au-dessus du lit fluidisé (6), mais sous la hauteur libre (8), et le gaz de fluidisation est injecté dans une partie du lit selon un débit excessif par unité de surface, au moyen de quoi, au-dessus du secteur d'injection accrue de gaz de fluidisation, le lit se dilate vers le haut jusque dans la zone de refroidissement d'où les matières particulaires qu'il contient et les matières combustibles non brûlées peuvent retomber sur le lit. Le gaz injecté (9) selon le débit plus élevé est envoyé vers le centre du lit fluidisé, la circulation de retour pouvant alors s'effectuer au-delà des cloisons à eau encerclant la zone de refroidissement, ce qui facilite un transfert efficace de chaleur en provenance du matériau du lit reflué sous la forme d'un rayonnement absorbé par les surfaces de transfert de chaleur des cloisons à eau de la zone de refroidissement.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: Finnish (FI)
Also published as:
CZPV1998-1171SK48798EP0856129EE9800118CN1204391AU1996073017