Device and method for drying by integrating vacuum, microwave and ice temperature technologies

A vacuum drying and drying technology, which is applied in the direction of drying solid materials, partial agitation dryers, and static material dryers, etc., can solve the problems of insufficient heat sensitivity and retention of biologically active substances, low quality of dried materials, and long drying time. To achieve the effect of shortening drying time, high drying efficiency and fast heating speed

Inactive Publication Date: 2011-10-26
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention discloses a device and method for drying by integrating vacuum, microwave and ice temperature technology, the purpose of which is to overcome the shortcomings of the existing vacuum freeze-drying,

Method used

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  • Device and method for drying by integrating vacuum, microwave and ice temperature technologies
  • Device and method for drying by integrating vacuum, microwave and ice temperature technologies
  • Device and method for drying by integrating vacuum, microwave and ice temperature technologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Slice food materials such as carrots and apples into the inner drying chamber, then close the vacuum drying chamber 1, start the refrigeration system to cool the cold trap 18, and start the vacuum pump 19 to evacuate the vacuum drying chamber 1 at the same time, free water on the surface of carrots and apple slices Evaporation, when the temperature is evenly lowered to the ice temperature zone (0~-5°C), maintain a certain degree of vacuum, start the microwave heating system to provide corresponding heat energy for the material to evaporate moisture, and the detection and control system detects the vacuum pressure, material temperature and microwave power in due course, and Automatically adjust the microwave power, control the microwave heating energy, and keep the material to be dried in the ice temperature zone until the end of the first sublimation drying; obtain high-quality dried carrots and apples with good color and rehydration properties.

Embodiment 2

[0045] Using the same drying process and process as in Example 1, put the bottled bioprotein medicines into the vacuum drying chamber 1, start the refrigeration system to cool down the cold trap 18, and start the vacuum pump 19 to vacuum the vacuum drying chamber 1 at the same time, pay attention to control The speed of vacuuming prevents splashing of liquid biological protein medicines. During the vacuuming process, part of the water evaporates, and the temperature of the biological medicine itself cools down. Sublimation of partially frozen water provides corresponding heat energy. The detection and control system timely detects vacuum pressure, material temperature and microwave power, and automatically adjusts microwave power, controls microwave heating energy, and keeps the material to be dried in the ice temperature zone until the end of the first sublimation drying; Higher quality biopharmaceuticals can be obtained that retain the activity of the biopharmaceuticals.

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Abstract

The invention relates to a device and method for drying by integrating vacuum, microwave and ice temperature technologies. The device is composed of a vacuum system, a refrigeration system, a microwave heating system and a detection control system. A vacuum drying chamber is arranged in a heating cavity of the microwave heating system, the side wall of the vacuum drying chamber is communicated with a pipeline, the pipeline extends out of the side wall of the heating cavity and then is connected with a cold trap, the cold trap is sequentially connected with a manual valve, an electromagnetic vacuum differential pressure value, a resistance gauge, a vacuum meter and a vacuum pump by virtue of the pipeline; the cold trap is connected with the refrigeration system; and a programmable logic control (PLC) module is respectively connected with a liquid crystal display screen, an optical fiber thermodetector, the microwave heating system, a pressure intensity automatic controller, a relay and a temperature sensor. The drying method comprises the following steps of: firstly vacuumizing the vacuum drying chamber, then rapidly and evenly cooling materials to an 'ice temperature zone', and regulating vacuum pressure, material temperature and microwave power timely by virtue of the detection control system, thus the materials are dried in an activated state. By adopting the device and method provided by the invention, the product quality can be improved, the drying time can be shortened, and the energy consumption can be reduced.

Description

technical field [0001] The invention relates to a device and method for drying by integrating vacuum, microwave and ice temperature technologies, and belongs to the technical field of drying of food and biological medicines. Background technique [0002] In the low-temperature storage of food, the storage temperature between 0°C and 10°C is called refrigeration, and the storage temperature below 0°C is called freezing. The freezing point of food, also known as the freezing point, is lower than 0°C. When the temperature is higher than the freezing point, the cells are always in a living state. Dr. Yamane Akimi defined the temperature zone below 0°C and above freezing point as the "ice temperate zone" of the food. [0003] At present, vacuum packaging and ice temperature storage are all used in the technical field of food preservation. Ice temperature technology (Controlled Freezing Point) is the third-generation fresh-keeping technology after refrigeration and controlled at...

Claims

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Application Information

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IPC IPC(8): F26B9/06F26B7/00
Inventor 李保国苏树强尚彦龙
Owner UNIV OF SHANGHAI FOR SCI & TECH
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