Indirectly heated fluidized bed dryer

Details Indirectly heated fluidized bed dryer Indirectly heated fluidized bed dryer

F - Mech Eng,Light,Heat,Weapons

26

B

F26B 3/084 (2006.01)

Patent

CA 2742929

The invention relates to an indirectly heated fluidized bed dryer (1) for drying moist, fine-grained bulk materials. The fluidized bed dryer (1) comprises a housing (2) with a gas-injection bottom (6) with built--in heat exchanger parts extending above the gas--injection bottom (6) and at least one discharge device, provided below the gas-injection bottom (60), for the dried bulk material. The fluidized bed dryer (1) according to the invention is distinguished in that the usable flow cross section of the housing (2) increases in the region of the built-in heat exchanger parts while the cross-sectional area of the housing remains the same over the height of the built-in heat exchanger parts in the direction of flow of the fluidizing medium. In this way, an inadmissible expansion of the stationary fluidized bed is reliably prevented.

L'invention concerne un séchoir en lit fluidisé (1) à chauffage indirect (1) servant à sécher des matières en vrac humides à grain fin. Ce séchoir en lit fluidisé (1) comprend une carcasse (2) comportant une base d'exposition gazeuse (6), des composants d'échange thermique s'étendant au-dessus de la base d'exposition gazeuse (6), et au moins un dispositif de sortie pour les matières en vrac séchées, qui est disposé sous la base d'exposition gazeuse (6). Le séchoir en lit fluidisé (1) selon l'invention est caractérisé en ce que la section transversale d'écoulement utilisable de la carcasse (2) augmente dans la direction d'écoulement de la substance fluidisée, au-delà de la hauteur des composants d'échange thermique, dans la zone des composants d'échange thermique, pour une surface de section transversale égale de la carcasse, ce qui permet d'empêcher avec fiabilité une expansion non tolérable du lit fluidisé stationnaire.

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