GESCHLOSSENES INTERMITTIERENDES TROCKNUNGSVERFAHREN.

摘要

PCT No. PCT/SE85/00097 Sec. 371 Date Oct. 23, 1985 Sec. 102(e) Date Oct. 23, 1985 PCT Filed Mar. 5, 1985 PCT Pub. No. WO85/04001 PCT Pub. Date Sep. 12, 1985.A closed intermittent process for drying a moist material, in which process gas is circulated internally for transporting vapour formation heat and water vapour out of the material, the water vapour being condensed from a cooled mixture of gas and water vapour, and for heating the material to be dried. The material is preferably stored in at least two essentially equally large lots (31, 32), each in one essentially gastight chamber (1, 2). Through one lot (31) there is conducted alternately a cooling/drying cycle and a heating cycle of equal duration, the former utilizing a first circulating gas flow (11) cooled by a cooling medium and the latter utilizing a second circulating gas flow (12) heated by a heating medium. Through the other lot (32), a third circulating gas flow (22) heated against a heating medium conducts a heating cycle concurrently with cooling/drying in the first lot (31), and a fourth circulating gas flow (21) cooled against a cooling medium conducts a cooling/drying cycle concurrently with the heating cycle in the first lot (31).