Freeze-Drying Apparatus for Fishery Products by Compulsive Circulation of Refrigerant

摘要

The present invention relates to a method for rapidly freezing aquatic products by freeze drying at low temperature and drying hot air at a high temperature to rapidly dry aquatic products, The present invention relates to a device for freezing and drying a freshwater aquatic product,The apparatus comprises a drying room (10) in which aquatic products to be dried are loaded and alternately applied with cold air at 15 to 20 C and warm air at 15 to 20 C to freeze the seafood and to perform hot air drying; A hot air drying unit 20 for circulating hot water of 50 to 55 C to the drying room 10 by using a hot water circulation pump 25 to heat and dry aquatic products; A rapid freezing section 30 for circulating a brine at a temperature of 50 to 55 C to the drying room 10 by using a brine circulation pump 35 to freeze the aquatic products; The primary refrigerant is cooled to a cryogenic temperature of minus 65 to 75 C through heat exchange between the primary refrigerant flowing along the different paths and the secondary refrigerant, and then the heat is exchanged with the brine of the quick freezing section 30 to cool the brine, A dual refrigerating unit 40 for heating water circulating through the hot air drying unit 20 using the latent heat of evaporation of the refrigerant; And a control unit for controlling the hot air drying unit 20 and the quick freezing unit 30 such that a freeze drying operation or a hot air drying operation is performed in the drying room 10 according to the passage of time.