Process of drying water-containing solids in a fluidized bed

Details Process of drying water-containing solids in a fluidized bed Process of drying water-containing solids in a fluidized bed

1993-06-17

1994-10-11

Bennett, Henry A.

Drying and gas or vapor contact with solids

Process

With fluid current conveying or suspension of treated material

34 74, 34469, F26B 308

Patent

active

053535170

ABSTRACT:
Water-containing solids are dried in a fluidized bed, which is indirectly heated by at least one heat exchanger. Water vapors having a high water vapor content are withdrawn from the fluidized bed and a part of the vapors is passed as a fluidizing fluid through the fluidized bed. The remaining vapors are cooled to form an aqueous condensate. At least part of the aqueous condensate is contacted in a purification zone with a gaseous or vaporous stripping fluid. Purified condensate and contaminated stripping fluid are separately withdrawn from the purification zone. Water vapor is preferably used as a stripping fluid in the purification zone.

REFERENCES:
patent: 2467435 (1949-04-01), Langhurst
patent: 2813823 (1957-10-01), Putman
patent: 3212197 (1965-10-01), Crawford
patent: 3258846 (1966-07-01), Powell, Jr.
patent: 3654705 (1972-04-01), Smith et al.
patent: 4171243 (1979-10-01), Brooks et al.
patent: 4295281 (1981-10-01), Potter
patent: 4715965 (1987-12-01), Sigerson et al.
patent: 5230167 (1993-07-01), LaHoda et al.

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