METHOD AND DEVICE FOR HEAT SUPPLY AND REGENERATION OF THERMAL ENERGY IN VACUUM DEHYDRATION AND DRYING MACHINE Russian patent published in 2007 - IPC F25B5/04 F25B9/06 F25B19/00 

FIELD: transmission of thermal energy to vacuum dehydration and drying machines, vacuum driers, evaporation machines and low-temperature dehydration of materials; reworking and utilization of wastes of poultry farms and pig-breeding farms; food-processing, medical and microbiological industries.

SUBSTANCE: proposed method includes loading the staring material, evacuation of chamber to pressure below atmospheric, mixing the starting material, collection, drainage and removal of condensate, conductive supply of heat to starting material at simultaneous heating it within temperature range whose low level is limited by water evaporation temperature at working pressure in technological space and upper level is limited by conditions ensuring avoidance of losses of useful properties of starting material and destruction of living cells which is necessary for retaining proper properties of final product. The process is completed by discharge of dehydrated product. Thermal energy of water steam released in the course of dehydration of starting material in vacuum chamber is returned to heating system of starting material due to compression of steam to pressure not below atmospheric, after which compressed steam is delivered to hermetic cavities of technological heat exchanger-evaporator unit where starting material is kept. Superheated steam is condensed inside unit and thermal energy released at this is transferred to material being dehydrated which moves over surface of unit. Condensate is continuously drained from hermetic cavities of heat exchanger-evaporator via pipe line connected to heat exchanger which is used for delivery of cold starting material to vacuum chamber. Thermal energy of condensate is transmitted to cold starting material. Device proposed for realization of this method includes vacuum chamber where technological heat exchanger-evaporator unit is mounted , loading/unloading system, starting material heating system, chamber evacuation system, condensate receiver; it is additionally provided with compressor connected with collector through which used hot water-and-steam mixture is discharged into technological heat exchanger-evaporator unit and then to heat exchanger used for heating the starting material for delivery of it to loading system.

EFFECT: reduction of heat losses.

3 cl, 1 dwg