Jwi Ltd.

John W Vanden Bos

David P Mc Leod

Thomas W Peterson

A batch-type dryer, such as for sludge, having a generally upwardly-opening channel-like drying chamber which is closed at opposite ends. The chamber is defined by a generally U-shaped sidewall having an arcuate bottom portion generated about a radius so as to define a generally semi-cylindrical configuration. The edges of this semi-cylindrical bottom wall are joined to straight sidewall parts which project upwardly in generally parallel relationship. An auger-type rotor extends axially along the bottom of the chamber to agitate the material therein. A heat exchanger is associated with and extends around at least the arcuate bottom wall of the chamber. The U-shaped wall of the chamber has the central upwardly-extending plane thereof disposed at a selected angle, preferably about 30.degree., relative to the vertical so that the material, when the agitator rotates, remains in intimate heat-transfer contact with the arcuate bottom wall over substantially the full 180.degree. extent thereof.

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Holland, MI, United States of America

John W Vanden Bos