Method and an apparatus for drying bulk material, preferably of plastic granules
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United States of America Patent
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-
Oct 3, 1989
Grant Date -
N/A
app pub date -
May 5, 1988
filing date -
Jul 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and an apparatus for drying bulk material, preferably of plastic granules, in a drying hopper by means of dry air, whereby the exhaust air escaping from the drying hopper is dried in a drier containing a humidity adsorption means and fed to the bulk material as dry air. In order to utilize more efficiently the adsorption capacity of the adsorption means and to save thus thermal energy, the invention provides that the exhaust air is cooled by the heat-adsorbing portion of a heat pump before it is fed to the adsorption means. Preferably, a heat-conveying portion of said heat pump is used for preheating the dried air before being fed to the drying hopper for drying the bulk material.
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