Talking about the development process and use situation of Chinese vacuum drying equipment
Since ancient times, humans have been accustomed to drying materials with natural heat sources and natural ventilation. Until now, some rural areas still use solar heat to dry materials. Although these natural methods are energy-saving and environmentally friendly, it is an indisputable fact that production efficiency is low. In addition, If it is wet and rainy, the disadvantages of this method are more obvious.
With the development of production technology, more and more drying equipment appeared, artificially controllable heat sources and mechanical ventilation and dehumidification methods gradually replaced the ancient methods, and the effect became increasingly prominent. According to the operating pressure of the equipment, it can be divided into two types: normal pressure and vacuum drying equipment. In this article, gongkong.com will focus on analyzing the development trends of vacuum drying equipment.
What is vacuum drying equipment?
The vacuum drying equipment is specially designed for drying heat-sensitive, easily decomposable and easily oxidized substances, and can be filled with inert gas, especially some items with complex composition can be dried quickly. When drying at low pressure, the oxygen content is low, which can prevent the material to be dried from oxidizing and deteriorating, and can dry flammable and explosive dangerous goods; it can vaporize the moisture in the material at low temperature, and it is easy to dry heat sensitive materials; it can recover the material in the dried material. Valuable and useful ingredients; can prevent the discharge of toxic and harmful substances in the dried materials, and can become an environmentally friendly "green" drying.
Development history of drying equipment in China
The first continuous vacuum freeze-drying equipment made in China was successfully developed by Shenyang Institute of Refrigeration Technology in 2000. The vacuum chamber adopts a rectangular structure, with spacers between the inlet and outlet bins and the drying bin, and an automatic weighing system is installed in the inlet and outlet bins, which can determine the drying rate of freeze-dried food, the amount of water and the final drying degree of . Two external water traps work alternately to achieve continuous water trapping and ice melting.
After more than ten years of development, my country's drying equipment industry has begun to enter a more mature stage, which can better meet the actual needs of users in various fields. In view of the "green" advantages of vacuum drying equipment, it is increasingly widely used. In terms of food and medicine drying, the demand for larger specifications of vacuum drying equipment will gradually increase, and the market prospect is very huge. But on the overall level, the development of vacuum drying equipment is relatively slow, and the technical level and use concept are relatively backward.
Unbalanced development of vacuum drying equipment
In the drying of crops, continuous vacuum drying equipment for grains plays an important role, but the amount of grain drying is large, continuous drying equipment must be used, and the cost of vacuum drying is too high. Therefore, the frequency of use of vacuum drying equipment in the agricultural field Not high.
In the field of food drying, food raw materials are abundant, and the output of products that need to be freeze-dried is large. Continuous food freeze-drying equipment appeared earlier than vacuum drying equipment. Danish ATLAS company produced CONRAD-800 continuous freeze-drying equipment in 1985 , Used for freeze-dried coffee production, which also means that vacuum drying equipment has no advantage in time.
It can be seen from the above that the development of vacuum drying equipment is not balanced. Especially for domestic products in my country, it is more necessary to strengthen R&D in terms of technology, and at the same time expand the promotion of products, so that consumers can understand and understand the products in depth. The use of can be more comprehensive.