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Vacuum freeze-drying equipment and method based on regeneration of closed hygroscopic solution

A technology of vacuum freeze-drying and solution regeneration, which is used in drying solid materials, lighting and heating equipment, and drying solid materials without heating. It can solve the problems of solution pollution, increased energy consumption, and increased heating system energy consumption. To avoid the fouling, blockage or corrosion of the pipeline, improve the heat exchange efficiency and improve the operation efficiency

Active Publication Date: 2017-07-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve such a temperature, a two-stage compression refrigeration system is widely used in the market now, which will make the whole system more complicated.
[0005] On the other hand, because the traditional freeze dryer uses the cooling coil to condense the sublimated water vapor in the material on its surface, when the ice on the surface of the coil accumulates to a certain thickness, the drying effect will gradually decline, and it needs to be stopped regularly for defrosting. The production process is discontinuous; even if multiple cold traps are used to ensure the continuity of the drying process by switching, it will make the system more complicated and lead to an increase in energy consumption
[0006] Patent CN102095305A discloses a freeze dryer with self-circulating regeneration of the cold trap, but its regeneration system is an open system, and its solution is easily polluted during the regeneration process , the equipment is also susceptible to corrosion, the water vapor evaporated from the regenerator cannot be reused, resulting in waste of heat, and the existence of an open system and the heat exchange with the outside world increase the energy consumption required for the heating system

Method used

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  • Vacuum freeze-drying equipment and method based on regeneration of closed hygroscopic solution
  • Vacuum freeze-drying equipment and method based on regeneration of closed hygroscopic solution

Examples

Experimental program
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Effect test

Embodiment 1

[0022] as attached figure 1 As shown, a vacuum freeze-drying equipment based on the regeneration of closed moisture absorption solution, the refrigeration system is a single-stage compression, including the cooling water inlet 1 of the refrigerant regenerator, the cooling water outlet 2 of the refrigerant regenerator, the condenser 3, the compressor Machine 4, refrigerant regenerator 5, expansion valve 6, evaporation heat exchange coil 7, cold trap coil 8, vacuum pump 9, freeze drying box 10, shelf 11, heating coil 12, lithium chloride solution 13, Lithium chloride solution pump 14, lithium chloride solution regenerator 15, regenerator 16, throttle valve 17, steam trap 18, regenerator heat-driven pipe inlet 19, regenerator heat-driven pipe outlet 20; inside the freeze-drying box 10 There is a shelf 11, and a heating coil 12 is arranged under the shelf 11; the outlet of the compressor 4, the condenser 3, the high-pressure passage of the refrigerant regenerator 5, the expansion ...

Embodiment 2

[0027] as attached figure 2As shown, a vacuum freeze-drying equipment based on the regeneration of closed moisture absorption solution, the refrigeration system is a two-stage compression, including condenser cooling water inlet 1, condenser cooling water outlet 2, condenser 3, expansion valve A4, intercooler 5. Expansion valve B6, evaporative heat exchange coil 7, cold trap coil 8, low pressure compressor 9, high pressure compressor 10, vacuum pump 11, freeze drying box 12, shelf 13, heating coil 14, lithium chloride solution 15. Lithium chloride solution pump 16, lithium chloride solution regenerator 17, regenerator 18, throttle valve 19, steam trap 20, regenerator heat-driven pipe inlet 21, regenerator heat-driven pipe outlet 22; freeze-drying box 12 is provided with a shelf 13, and a heating coil 14 is provided under the shelf 13; the high-pressure liquid coming out of the condenser 3 is divided into two parts, and one part is overcooled by the intercooler 5 and then pass...

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Abstract

The invention discloses a vacuum freeze-drying device and method based on closed-type hygroscopic solution regeneration. A vacuum freeze-drying equipment based on regeneration of a closed moisture absorption solution, including a refrigeration module, a vacuum module, a heating module, a regeneration module, and a freeze-drying box. The regeneration module adopts a closed lithium chloride solution regeneration system, and no external environment The air and other impurities enter the regeneration module, and the water vapor evaporated from the regeneration module will not be directly discharged into the external environment; the freeze-drying box uses lithium chloride solution to absorb water vapor. The invention adopts a closed regeneration system, which is safer than an open system, has a long service life, saves energy, and the pipeline is not in contact with the atmosphere, and is not easy to corrode; compared with traditional freeze-drying equipment, it can increase the evaporation temperature of the refrigeration system, which is The improvement reduces the compression ratio of the refrigeration compressor to achieve the effect of energy saving, and also simplifies the refrigeration system from two-stage compression to single-stage compression.

Description

technical field [0001] The invention relates to a freeze dryer, in particular to a vacuum freeze-drying device and method based on regeneration of a closed hygroscopic solution. Background technique [0002] Freeze-drying technology (referred to as freeze-drying technology) is a commonly used drying technology for preserving biologically active substances, and has been widely used in food and pharmaceutical fields. The basic method is to cool and freeze the material, then vacuumize and provide heat to sublimate the water in the material and dry the material. The finished product of freeze-drying technology can basically maintain the original appearance in appearance, and the rehydration is fast, which can avoid the loss of activity caused by high temperature. [0003] Most freeze dryers are composed of refrigeration system, vacuum system, heating system, monitoring system and other parts. The function of the refrigeration system is to provide cooling capacity for the dryin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B5/06
Inventor 张绍志罗介霖姚玉芳陈光明
Owner ZHEJIANG UNIV