Method and apparatus for reducing volatile content of sewage slu

Details Method and apparatus for reducing volatile content of sewage slu Method and apparatus for reducing volatile content of sewage slu

1989-03-20

1993-11-23

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34179, 34183, F26B 332

Patent

active

052632679

ABSTRACT:
Apparatus for the drying of sludges and other fouling feed materials. A rotary screw type indirect heat exchanger is provided having at least one screw member. The screw member includes a helical-shaped flight having a helix angle of about 10 degrees or less and a surface roughness of about 63 micro-inches or less. Means are provided for rotating and heating the screw member and for spreading feed material onto the screw member. The apparatus operates at heat transfer rates and for a time period sufficient to reduce the moisture content of the feed material without requiring mechanical cleaning of feed material foulants from the screw member.

REFERENCES:
patent: 337560 (1886-03-01), Cook
patent: 1334495 (1920-03-01), Jackson
patent: 3426838 (1969-02-01), Onarheim
patent: 4135309 (1979-01-01), Bosnjak
patent: 4750274 (1988-06-01), Erdman, Jr.
patent: 4982514 (1991-01-01), Ullum

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