Low-temperature rapid freezing and freeze-drying system

Abstract

The invention provides a low-temperature rapid freezing and freeze-drying system. The low-temperature rapid freezing and freeze-drying system comprise a compressor unit, a first heat exchanger, an air cooler, a second heat exchanger, a throttling component, a third heat exchanger, a circulating fan, a drying chamber, a third valve, a fourth valve and a connection pipeline, wherein the parts form a refrigeration circulation loop, a rapid freezing / freeze-drying circulation loop and a desorption drying circulation loop, so the material can be rapidly frozen and frozen-dried. According to the low-temperature rapid freezing and freeze-drying system, the heat exchanger with refrigeration capacity storage functions are used for storing the refrigeration capacity of the compressor and intensively using the refrigeration capacity of the compressor; the material can be rapidly cooled.

Description

technical field [0001] The invention relates to the technical field of freeze-drying, in particular to a low-temperature quick freeze-drying system. Background technique [0002] Drying is one of the ways to keep things from spoiling. There are many drying methods, such as traditional drying, boiling, drying and spray drying, etc., and these drying methods are carried out at a temperature above 0°C or higher. The products obtained by drying will generally shrink in size and harden in texture, some substances will be oxidized, most of some volatile components will be lost, and heat-sensitive substances such as proteins and vitamins will be denatured, and microorganisms will lose their biological vitality. And the dried substance is not easy to dissolve in water. Therefore, compared with before drying, the product after drying has a great difference in properties. Superheated steam drying has been applied in some countries in recent years, but it is also not suitable for he...

AI Technical Summary

Problems solved by technology

At present, electric heating or steam heating is generally used, resulting in additional energy consumption of the system

[0004] Patent CN101140126B proposes a freeze-drying system using liquid nitrogen refrigeration. Due to the use of liquid nitrogen refrigeration, the required heat needs to be heated additionally during the desorption process, and the source of liquid nitrogen is limited, so the application is inconvenient

Patent CN1987314B proposes a vacuum freeze-drying integrated machine using two-stage compression refrigeration, using the cold source and heat source of the refrigeration compressor unit to cool and heat the material, which can greatly reduce the total installed power. Two-stage compressor with intermediate cooling, and there is no effective recovery of refrigerant return air cooling capacity, and the refrigeration efficiency is limited; at the same time, the system only has a freeze-drying process, no desorption process, and the moisture absorbed in the material cannot be removed

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