Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1994-08-08
1997-12-16
Bennett, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34147, 34182, 34241, 110224, 110257, F26B 1102
Patent
active
056971680
ABSTRACT:
Single or multi-screw indirect-heating screw conveyor desorbers having a heating gas guide enclosed by the screw shaft wall (single-wall screw shafts) or located between a screw shaft wall and an internal chamber wall (double-walled screw shafts). Predetermined amounts of cooling and diluting fluid may be added to a heating gas stream to control the maximum temperature thereof. Screw shaft support bearings and rotary drive components may be cooled, and conveyor wall and/or screw shaft surfaces (e.g.. screw flights and interflight surfaces) may be automatically cleaned during screw shaft rotation by hardened bits and/or breaker devices. Cleaning operations may also involve the interaction of two counter-rotating conveyor screw shafts having mutually interleaved and opposite-handed external flights. Sizing and placement of breaker devices and/or hardened bits is determined empirically to be that necessary to effect substantial removal of material accumulations which would otherwise significantly interfere with efficient conveyor operation. Application of the invention allows design and production of desorbers having decreased weight and size and increased efficiency and reliability compared with currently available indirect-heating screw conveyor desorbers having external screw flights.
REFERENCES:
patent: 4504222 (1985-03-01), Christian
patent: 4606283 (1986-08-01), DesOrmeaux et al.
patent: 5010831 (1991-04-01), Halfhide
patent: 5321898 (1994-06-01), Robinette, Jr. et al.
Article entitled "Low-Temperature Thermal Treatment of Contaminated Soils," The Hazardous Waste Consultant, Mar./Apr. 1992, pp. 1.1-1.4.
Katko Michael
Marcelino Felix G.
Matthys Philippe J.
Matthys Pierre
Shelden Robert A.
Bennett Henry A.
Gravini Steve
Separation and Recovery Systems, Inc.
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