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In the field of fluidized bed dryers for fruits and vegetables: The research and application of main fruits and vegetables, such as apples, pears, oranges, grapes, tomatoes, green peppers, garlic sprouts, Chinese cabbage, etc. Storage and freshness and circulation technology are basically mature, MAP technology , CA technology, etc. have been widely used in the storage and transportation of fresh fruits and vegetables in even the country. The spray drying tower significantly improves the processing of fruit and vegetable juices: High-performance squeezer technology Tumbler dryer, high-temperature short-term sterilization technology, aseptic packaging technology, enzyme liquefaction and clarification technology, membrane technology have been widely used in production. Fruit and vegetable processing equipment can not be dry and dry, such as apple juice concentrate and tomato sauce processing equipment basics from abroad to introduce the most advanced equipment.
At present, a new type of small-scale spray drying tower for spray freeze-drying equipment is researched and developed. Continuously producing low-temperature and low-humidity air using freeze-drying dehydration, combined with a specially designed atomizing device, continuous liquid ice-making powder and drying are achieved.
Quick-freezing fruits and vegetables: In recent years, there have been many major developments in the quick-freezing technology for fruits and vegetables. Firstly, the form of the fruit and vegetable in the spray drying tower of the quick-freezing combination dryer is changed from the whole large package to the small package after the processing and fresh-cut processing; the freezing method of the raw material has begun to be widely used in the air-medium blowing hot-air drying machine type freezing device. Pipe rack freezers, freezers that can be continuously produced, fluidized freezers, etc., make the temperature of the freeze more uniform, and the production efficiency is higher in winter when the skin is dry. The third element as a cold source refrigeration device also has new breakthroughs, such as the use of Liquid nitrogen and liquid carbon dioxide are directly sprayed and frozen, so that the temperature of the dryer dryer parts is significantly reduced, the freezing speed is greatly increased, and the quality of quick-frozen vegetables is fully improved. In terms of quick-freezing equipment, the country has developed equipment such as screw-type quick-freezing machines, flow-mesh belt dryers and quick-freezing machines to meet some of the requirements of the domestic quick-freezing industry.
The biggest feature of the spray-drying tower is that the surface area for evaporation and drying is very large. For example, if a 1 cm3 liquid is atomized into 100 μm droplets, the surface area will increase by more than 19,000 times, thus making the drying rate drastically increase. Freeze-drying requires a long sublimation drying time, but it can maintain the original quality of the dried product, so as not to cause the material to denature. Therefore, the combination of the above two drying methods can give full play to the advantages of the two drying technologies, and can shorten the drying time while maintaining the quality requirements of the materials.