Fluidized bed drying

F - Mech Eng,Light,Heat,Weapons – 26 – B

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34/10.1

F26B 3/08 (2006.01) F26B 3/10 (2006.01)

Patent

CA 1133245

- 1 - Abstract: The invention resides in one embodiment in a multiple effect method of and apparatus for drying a solid material containing a vapourisable material which comprises estab- lishing at least first and second fluidized beds contain- ing the solid material in which in at least the first fluidized bed the fluidizing medium is the vapourisable material in vapour form and in which the fluidized beds are heated indirectly, such that vapourisable material is removed from the solid material, the vapourisable material removed from the solid material in the first fluidized bed being used to provide the indirect heating of the second fluidized bed. The invention resides in another aspect in a method of drying a solid material containing a vapour- isable material which comprises establishing a fluidized bed containing the solid material in which the fluidizing medium is the vapourisable material in vapour form and in which the fluidized bed is heated indirectly by vapouris- able material in the form of a saturated vapour, such that vapourisable material is removed from the solid material, the removed vapourisable material being fed to a steam generator wherein it is used to produce clean saturated steam by heating the condensate from indirect heating of the fluidized bed.

394703

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