Method and apparatus for drying the fuel of a fluidized-bed...

F - Mech Eng,Light,Heat,Weapons – 23 – G

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F23G 5/04 (2006.01) F23C 10/10 (2006.01) F23C 10/26 (2006.01) F23C 10/28 (2006.01) F23K 1/04 (2006.01)

Patent

CA 2124451

The present publication discloses a method and an apparatus for drying the fuel used for firing a fluidized-bed boiler (1). The hot, inert solids of the fluidized bed are circulated by a regulated rate from the furnace (2) to a simple dryer (11) incorporated into the fuel feed line (7) to the boiler (1), whereby the fuel is dried and steam is generated. By virtue of controlled bed solids recirculation, a constant temperature of the dryer (11) can be maintained, thus permitting the omission of all heat transfer surfaces from the dryer (11). The nearly clean steam released from the drying process is routed from the dryer (11) to useful applications.

La présente invention concerne un procédé et un appareil pour sécher le combustible utilisé pour chauffer une chaudière à lit fluidisé (1). Les solides inertes, chauds du lit fluidisé sont mis en circulation à une vitesse régulée depuis le four (2) vers un sécheur simple (11) incorporé dans la ligne d'alimentation du combustible (7) de la chaudière (1). Dans le sécheur, le combustible est séché et de la vapeur est générée. Grâce à la recirculation contrôlée des solides du lit, une température constante du sécheur (11) peut être maintenue, permettant ainsi la suppression de toutes les surfaces de transfert de chaleur du sécheur (11). La vapeur pratiquement propre libérée par le procédé de séchage est dirigée depuis le sécheur (11) vers des applications utiles.@F@

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