Apparatus and method for moisture control of particulate...

F - Mech Eng,Light,Heat,Weapons – 26 – B

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F26B 19/00 (2006.01) F26B 3/00 (2006.01) F26B 21/06 (2006.01) F26B 21/08 (2006.01)

Patent

CA 2294016

Moisture content of material such as thermoplastic pellets (80) in a hopper (30) is controlled by supplying dehumidified air from a dessicant bed (90) to the hopper (30) and returning air from the hopper (30) to the dessicant bed (90). A dew point sensor (10) in the return air path determines the moisture content of the material (80) in the hopper (30), and when the dew point drops to a pre-set level, a diverter (134) causes the return air flow to bypass the dessicant bed (90) and to be re-supplied to the hopper (30) without dehumidification. Two dessicant beds are provided, one of which is on-process while the dessicant in the other is regenerated.

On peut réguler la teneur en humidité d'un matériau, tel que des pastilles thermoplastiques (80) dans une trémie (30), en amenant de l'air déshumidifié provenant d'un lit de déshydratant (90) jusqu'à la trémie (30) et en faisant ensuite retourner l'air de la trémie (30) au lit de déshydratant. Un capteur de point de rosée (10) dans le trajet de retour de l'air détermine la teneur en humidité du matériau (80) dans la trémie (30) et, lorsque le point de rosée tombe à un niveau préétabli, une chicane (134) amène le flux d'air de retour à contourner le lit de déshydratant (90) et à retourner à la trémie sans déshumidification. Deux lits de déshydratants sont prévus, l'un est alimenté en continu alors que dans l'autre, le déshydratant est régénéré.

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