Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1981-11-18
1985-01-08
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 48, 34 57A, 432 15, 432 58, F26B 308, F26B 1700
Patent
active
044920407
ABSTRACT:
A fluid bed dryer comprises a pre-dryer of the back mixed type and a post-dryer of the plug flow-type. In the pre-dryer the main part of heat is transferred to the product being dried by means of heating panels arranged above the bed plate. A control bed is interposed between the pre-dryer and the post-dryer and includes one or more temperature sensors for sensing the temperature of the product in the control bed. Heat supply to the heating panels is controlled in response to the temperature sensed by the sensor or sensors in order to maintain the product temperature in the pre-dryer at the dew point and so as to ensure that the drying process proceeds within the region of constant drying rate, and that the product contains little or substantially no unbound moisture despite possible changes in product fed to the pre-dryer.
REFERENCES:
patent: 2378157 (1945-06-01), Ramseyer et al.
patent: 3186102 (1965-06-01), Brociner et al.
patent: 3861054 (1975-01-01), Stahl
patent: 3861058 (1975-01-01), Whelan
patent: 3893426 (1975-07-01), Bryers
patent: 3908284 (1975-09-01), Beranek et al.
Jensen Uffe L.
Mortensen Sten
A/S Niro Atomizer
Schwartz Larry I.
Westphal David W.
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