Method for drying sludge

Details Method for drying sludge Method for drying sludge

1990-01-02

1990-11-20

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

110224, 34 17, F26B 308

Patent

active

049708031

ABSTRACT:
A sand layer is fluidized by a gas stream or current in a fluidized bed dryer and indirectly heated by immersed stationary heat-exchanger tubes. The sludge to be dried is continuously fed under pressure in a pumpable conditon from above onto the fluidized sand layer. The sludge is coagulated in the fluidized sand layer to form sludge lumps. Here, the sludge lumps are successively dried from the surface down to the core thereof, and the already dried layers of the sludge lumps are successively abraded by the fluidized sand, whereby the sludge lumps are entirely comminuted and the dry matter thereof is pulverized to form dust. This product dust is continuously discharged together with the exhaust-gas stream from the fluidized bed dryer and continuously separated as a product from the exhaust-gas stream. The gas stream or current freed from dust is partially recycled in a closed circuit back to the fluidized bed dryer for fluidization of the sand layer.

REFERENCES:
patent: 4159682 (1979-07-01), Fitch et al.
patent: 4429643 (1984-02-01), Mulholland
patent: 4583470 (1986-04-01), Hirose
patent: 4628833 (1986-12-01), O'Hagan et al.
patent: 4787323 (1988-11-01), Beer et al.

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