Steam atmosphere drying exhaust steam recompression system

Details Steam atmosphere drying exhaust steam recompression system Steam atmosphere drying exhaust steam recompression system

1992-04-03

1994-03-08

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With waste gas heat and/or power conservers

34219, 34 82, F26B 1900

Patent

active

052916685

ABSTRACT:
This invention relates to a heated steam atmosphere drying system comprising dryer in combination with an exhaust recompression system which is extremely energy efficient and eliminates dangers known to air dryers. The system uses superheated steam as the drying medium, which recirculated through the system where its heat of evaporation and heat of compression is recovered, thereby providing a constant source of heat to the drying chamber. The dryer has inlets whereby feedstock and superheated steam are fed therein. High heat transfer and drying rates are achieved by intimate contact of the superheated steam with the particles being dried The dryer comprises a vessel which enables the feedstock and steam to enter recirculate together. When the feedstock becomes dry it will exit the dryer with the steam and become separated from the steam through the use of a curvilinear louver separator (CLS). The CLS enables removal of fine and ultrafine particles from the dryer. Water vapor separated from the particles in the CLS as superheated steam, may then be recovered and recirculated as steam through the use of a compressor to either directly or indirectly heat the dryer, and a heat exchanger or a heater to directly provide heat to the dryer. This system not only provides a very efficient heat transfer system but results in a minimum carry-over of ultrafine particles thereby eliminating any explosive hazard.

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"Steam Dryer Aimed at Byproducts", Food Engineering, V55, N2, pp. 102-103 Robert O. Covington, 1983.
"Heat Pumps in Drying", Institute of Chemical Engineering, Zytta et al., 1985, pp. 129-141.

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