Multi-layer cold and hot sharing vacuum freeze-drying system

Abstract

The invention relates to a multi-layer cold and hot sharing vacuum freeze-drying system. The system comprises a pre-freezing unit, a dehydration unit, a negative pressure unit and a heat pump unit. Aproduct is dehydrated in the dehydration unit after being frozen in the pre-freezing unit, and the dehydration unit ensures that the interior of the dehydration unit is in negative pressure through the negative pressure unit. The heat pump unit comprises a high-temperature side heat pump assembly and a low-temperature side heat pump assembly, a high-temperature condenser of the high-temperature side heat pump assembly provides heat energy for the interior of the dehydration unit, and the low-temperature side heat pump assembly provides cold energy for the pre-freezing unit and the dehydrationunit. The system simultaneously meets the requirements for the amount of cold energy and heat energy in a pre-freezing process and a vacuum drying process; existing conventional steam systems, hot oilsystems and other systems are omitted; heat dissipation equipment such as an external cooling tower required by an existing system is also omitted; and a low-temperature condenser is adopted as a water removal device in the dehydration unit, it can be guaranteed that the water removal device is free of frosting and freezing phenomena, the system efficiency is high, the energy-saving effect is obvious, and the production and processing speed is increased.

Description

technical field [0001] The invention relates to the technical field of vacuum freeze-drying, in particular to a vacuum freeze-drying system with multi-level cooling and heating. Background technique [0002] Vacuum freeze-drying technology is a drying technology that uses the principle of low sublimation temperature in a vacuum environment to dehydrate the material. After the material is quickly frozen, it is heated in a vacuum (lower than the triple point pressure of water) environment. For the field of vacuum freeze-drying, there are mainly two processes in the process, the first process is pre-freezing, and the second process is vacuum dehydration; currently for the first process, a set of low-temperature units are usually used for cooling; for the second process Two processes, using steam, hot oil and other temperatures within the range of 90-140 ° C to provide the heat required for the dehydration and evaporation process of the material; using a set of types of units to...

AI Technical Summary

Problems solved by technology

[0004] 1. The condensing end of the refrigeration unit is completely wasted, and cooling towers are needed to dissipate heat at the same time, and the investment is high;

[0005] 2. An additional high-temperature heat source is required for the heat of material dehydration and evaporation, and the cost is high;

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