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Microwave vacuum freeze-drying equipment is well-defined Reporter: Microwave vacuum freeze-drying equipment is a high-tech product, and many food industry employees are not very clear about its concept. You are one of the few experts who have pioneered the successful development of microwave vacuum freeze-drying equipment. Can you define this high-tech equipment accurately? Chen Jinchuan: To understand the definition of microwave vacuum freeze-drying equipment, we must first understand the meaning of vacuum freeze-drying. Vacuum freeze-drying, commonly referred to in industry, refers to a technique of sublimation drying (ie freeze-drying) of a material under vacuum. In the process of vacuum freeze-drying the material, it is necessary to first turn the drying chamber into a vacuum state, and then freeze and sublimate the material. When the material is frozen, the temperature is generally selected below -20°C, but in actual operation, it should be determined according to the characteristics of different materials.
Reporter: Which methods are used to heat the material when it is vacuum-frozen?
Chen Jinchuan: When the materials are freeze-dried, they need to provide sublimation heat to the materials. Generally, they are heated by electric heating, alcohol burning, and diesel combustion.
Reporter: The meaning of vacuum freeze-drying equipment has been relatively clear, then, what is the definition of microwave vacuum freeze-drying equipment?
Chen Jinchuan: In vacuum freeze-drying of materials, if microwaves are used to provide sublimation heat, then this drying method is called microwave vacuum freeze-drying.
Microwave vacuum freeze-drying technology has obvious advantages Reporter: What are the advantages of using microwave vacuum freeze-drying equipment in the production of health products and processing of agricultural products?
Chen Jinchuan: There are several advantages in this aspect: First, the shape, color, nutrient composition and aroma of the material can be effectively maintained. These characteristics are particularly important for the production of health products; second, it can save energy in a big way. When the material is treated by the freeze-drying method, the heat of sublimation needs to be supplemented. When vacuum freeze-drying equipment is used to treat materials, there are several main methods for supplementing sublimation heat: electric heating, diesel heating, and alcohol heating. These heatings are carried out in a conductive manner, which has the disadvantages of prolonged heating time and excessive energy consumption. Under the vacuum state, because there is almost no convection phenomenon and convective heat transfer method, the sublimation heat can only be supplemented by conduction. Therefore, the drying time is long, the speed is slow, the energy consumption is large, and the processing cost is high. Microwave heating can save a lot of energy and increase the speed of heating and drying. This is because the microwaves have penetrability. When heating an object, no media is required, and both the inside and the outside of the material can be heated at the same time. According to domestic and foreign data shows that the use of microwave equipment to heat the material, the speed and efficiency of the conventional heating method 4 to 20 times.
Microwave vacuum freeze-drying equipment locked high-end products Reporter: China's microwave vacuum freeze-drying equipment is currently used in which food production?
Chen Jinchuan: At present, microwave vacuum freeze-drying equipment is mainly used for the production of high-value and high-quality foods, such as health foods and high-grade seasonings. Can be subdivided into: First, for the production of health products. Including royal jelly freeze-dried powder, pure snake powder, turtle powder, Cordyceps sinensis, pilose antler, ginseng, spirulina powder and so on. The second is for the processing of agricultural products with high added value. Such as dehydrated vegetables, dehydrated meat products, dehydrated seafood, these semi-finished products or products produced by microwave vacuum freeze-drying method are light in weight, rehydration performance is very good, the color and state after rehydration are fresh, and it is easy to carry and store. And transport can be stored at room temperature for 3 years. These processed dehydrated products are used as a high-grade ingredient and can be used as ingredients for convenience foods such as instant noodles and instant rice noodles. The third is for the production of condiments. If ginger and garlic are treated at high temperatures, the savory substances in these two materials are easily destroyed, resulting in a decrease in their content. If the microwave vacuum freezing and drying equipment is used to treat garlic and ginger, the taste substances and nutrients in the raw materials can be well preserved, and high-quality garlic powder and ginger powder can be produced.
Prospects of equipment market are promising Reporter: How many domestic companies produce microwave vacuum freeze-drying equipment?
Chen Jinchuan: There are not many companies that are developing vacuum freeze-drying equipment in China. There are even fewer companies that produce microwave vacuum freeze-drying equipment. There are only a few companies. In fact, in the world, there are very few research institutions and companies that can successfully solve the “low-pressure gas discharge problem†in the production of microwave vacuum freeze-drying equipment.
Reporter: What is the technological level of microwave vacuum freeze-drying equipment produced by Nanjing Yatai Institute of Microwave Energy?
Chen Jinchuan: Nanjing Yatai Microwave Energy Research Institute successfully developed microwave vacuum freeze-drying equipment last year to solve the problem of low-pressure gas discharge. At present, this kind of microwave vacuum freeze-drying equipment has been used by large-scale production enterprises of royal jelly lyophilized powder, condiment manufacturers, and dehydrated vegetable manufacturers. The feedback from customer feedback shows that the results are gratifying. Because the raw materials have different water content, structure, viscosity and other properties, and there are many types of raw materials, different raw materials have different requirements for microwave design parameters. Therefore, in the process of processing agricultural products, microwave equipment has a strong One sex is hard to use universally. For different agricultural products, microwave equipment with different structures and properties must be used for processing. In the next step, Nanjing Yatai Microwave Energy Research Institute will research and develop dedicated microwave vacuum freeze-drying equipment based on the physical and chemical properties of different raw materials, and provide better equipment for health care products and agricultural product processing industries.
Reporter: What do you think of the market application prospect of microwave vacuum freeze-drying equipment?
Chen Jinchuan: As the microwave vacuum freeze-drying equipment has many advantages, its market prospects are very good, especially in the aspect of the processing of health products and high value-added agricultural products, it can play a very important role.
The prospects of microwave vacuum freeze-drying equipment are promising
What is microwave vacuum freeze-drying equipment, microwave vacuum freeze-drying equipment has what application advantages, this equipment in the food industry application prospects? Recently, with these questions, the reporter interviewed Chen Jinchuan, an authoritative expert in microwave vacuum freeze-drying equipment in China, a professor-level senior engineer, and director of the Nanjing Yatai Microwave Energy Institute. Microwave vacuum freeze-drying equipment is a high-tech product with excellent application performance, but its application scale in China's food industry is still not very large. For the future of microwave vacuum freeze-drying equipment in China, Chen Jinchuan, director of the Nanjing Yatai Microwave Energy Research Institute, believes that microwave vacuum freeze-drying equipment extends the shelf life of food, preserves the original flavor and nutrient composition of food, and preserves the physiological activity of raw materials. Enhance the functionality of health foods, increase the added value of agricultural products, etc., have a positive significance, and therefore have a wide range of uses in the health food industry and agricultural products processing industry.