Method of entrained flow drying

Details Method of entrained flow drying Method of entrained flow drying

1981-10-13

1984-05-01

Garris, Bradley

Distillation: processes, thermolytic

Miscellaneous

34 10, 432 14, 432 15, C10B 5708, C10B 5710

Patent

active

044459769

ABSTRACT:
An improved process and system for drying moist particulate carbonaceous materials. The invention has particular application to staged drying processes wherein the particulate material is entrained in one or more serially connect hot gas streams having a temperature above the degradation point of the carbonaceous material. The improvement includes providing contactors between the stages which intimately mix and contact the variously sized particles resulting in partial cooling of the smaller hot and dry particles and partial heating of the larger cool and relatively moist particles. The contactor may be provided by a rotating drum, moving bed, fixed bed or fluidized bed. The contactors prevent overheating of small particles during moisture removal and reduce hydrocarbon loss from small particle devolatilization. Removal of smaller dry particles or fines is provided from the contactors with the separated out fines being combusted to provide at least a portion of the heat necessary for operating the drying system while at the same time reducing heat loads.

REFERENCES:
patent: 2956347 (1960-10-01), Gordon
patent: 3192068 (1965-06-01), Brandt
patent: 3316155 (1967-04-01), Holowaty et al.
patent: 3484364 (1969-12-01), Hemminger
patent: 3843458 (1974-10-01), Kemmetmueller
patent: 3884620 (1975-05-01), Rammler
patent: 3925190 (1975-12-01), Whitcombe et al.
patent: 4174947 (1979-11-01), Delessard et al.
patent: 4178150 (1979-12-01), Flockenhaus et al.

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