Application of microwave vacuum drying technology

In the late 1980s, the company began to develop microwave vacuum drying equipment. Through years of efforts, around 2000, the low-pressure microwave field arcing discharge was successfully solved, the heating temperature difference between the paving layers, the non-contact temperature measurement in the microwave field, etc. A number of problems have entered the stage of industrial production from the experimental stage. It provides a new and efficient drying equipment for food engineering, pharmaceutical engineering, bioengineering, chemical engineering, materials engineering and deep processing of agricultural and sideline products.
Microwave vacuum drying features:
Efficient: In conventional vacuum drying equipment, (assuming a vacuum pressure of 7.37 kPa, a material dewatering temperature of 40 ° C, and 1 kg of water vaporization heat is 574 kcal), it is very difficult to conduct heat through convection in a vacuum case. The heating is slow, the drying cycle is long, and the energy consumption is large. The microwave vacuum drying device adopts radiation energy transfer, which is the overall heating of the medium, and does not require other heat transfer medium, thereby avoiding the above disadvantages, so the speed is fast, the efficiency is high, the drying cycle is greatly shortened, and the energy consumption is reduced. Compared with conventional drying technology, it can improve work efficiency by more than four times.
Uniform heating: Since microwave heating is simultaneous heating inside and outside the material, the temperature difference between the inside and outside of the material is small, and the inconsistent heating inside and outside of the conventional heating does not occur, and the drying quality is greatly improved. Easy to control: It is convenient for continuous production and automation. Due to the rapid adjustment of microwave power and the characteristics of no inertia, it is easy to control in time and facilitate the adjustment and determination of process parameters.
The device is small in size and easy to install and maintain:
Good product quality: Compared with the conventional method, the quality of the processed products has been greatly improved.
In addition, the microwave equipment has the functions of disinfection and sterilization, and the product is safe and sanitary. The shelf life can be extended.
From the above-mentioned characteristics, energy saving, consumption reduction, product quality improvement, safety and hygiene, and low equipment investment cost can be seen to show significant economic and social benefits. In the processing of dehydrated vegetables, the comparison of the process performance, economic benefits, product quality of various drying equipment is shown in the table.

Finished product quality\project Microwave vacuum equipment Freeze drying equipment Hot air drying equipment
Vitamin and other nutrient preservation rates 85% 95% Thermal decomposition, no preservation
Flavor color Basic preservation Save all Great change
Rehydration 3 minute recovery 3 minute recovery More than 15 minutes
Chewing feeling intact difference general
Device characteristics
Equipment cost Half of the lyophilizer expensive Cheap
Operating costs 2-3 yuan / kg 20 yuan / kg 1-1.5 yuan / kg
Drying time 3-4 hours 20 hours 5-6 hours
Floor area small in Big
Bactericidal action no no no
Comparison of drying efficiency between microwave vacuum equipment and conventional vacuum equipment model Power consumption Water consumption per hour (kg/kw.h)
Microwave vacuum equipment 25kw 10kg 0.4
Vacuum equipment 23kw 2.5kg 0.1

Comparing the microwave vacuum drying equipment to 4 times the efficiency of conventional vacuum equipment, it can be seen that microwave vacuum drying is a high-tech with significant economic benefits and high promotion value. At present, the new industrialized microwave vacuum drying equipment developed by our company has passed the appraisal of relevant national units, and has formed a series of products from 2kw-100kw microwave vacuum drying equipment. This will provide a modern high-tech drying equipment for many fields and scientific research departments of China's national economy.
Microwave vacuum drying equipment is a new type of microwave energy application equipment combining microwave energy technology and vacuum technology. It has a series of advantages of microwave and vacuum drying, and overcomes the shortcomings of conventional vacuum drying cycle and low efficiency. In the drying process, it has the advantages of high dry yield, good quality and low processing cost. The microwave vacuum drying equipment is a high-tech product integrating electronics, vacuum, mechanics, thermodynamics and program control. Based on the in-depth study of physical changes in materials during drying, internal and external heat and mass exchange, and moisture migration under vacuum conditions, a new technology and process have been developed. The microwave vacuum drying device is composed of a microwave generator, a vacuum drying chamber, a material rotating disc, a vacuum system and an electronic control system.
In industrial production, many items cannot be dried under high temperature conditions, such as some medicines, chemicals, nutritious foods, and high-grade Chinese herbal medicines such as ginseng and antler. In order to ensure product quality, the drying treatment must be below 100 °C or It is known to carry out at room temperature, and it is known that the gas pressure is lowered and the boiling point of water is lowered. For example, at one atmosphere (101.3 kpa), the boiling point of water is 100 °C, and at 0.073 atm (7.37 kpa), the boiling point of water is 40 °C. Under vacuum conditions, heating the object allows the internal moisture of the object to evaporate without temperature rise. Air convection heat transfer is difficult due to vacuum conditions, and heat is supplied to the material only by means of heat conduction. Conventional vacuum drying methods have a very slow heat transfer rate, low efficiency, and difficulty in temperature control. The heated material also produces internal and external temperature differences. Microwave heating is a kind of radiant heating. It is a direct action of microwaves and objects, so that it can be heated at the same time inside and outside. It does not need to transfer heat through convection or conduction, so the heating speed is fast, the drying efficiency is high, and the drying quality is high.
Developed countries such as the United States, France, and Japan began industrial microwave vacuum drying equipment development in the 1980s. And achieved good results in practical applications. The University of California collaborates with a company to process seedless raisins using microwave vacuum drying equipment. The traditional process is changed to 65 ° C, 24 hours hot air drying to 50 ° C, 5 hours microwave vacuum drying, and the product quality is greatly improved. Microwave vacuum dryer (2450MHz, 48kw) manufactured by France International Microwave Co., Ltd. processes instant orange powder. The product not only maintains its original color, aroma, taste, but also retains its vitamins much faster than spray drying.

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