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In order to accelerate the development of freeze-drying technology in China, the Ministry of Mechanical and Electrical Industry included the industrial vacuum freeze-drying machine in the 1986 Industrial Technology Development Fund project. It was undertaken by Huazhong University of Science and Technology and cooperated with Zhejiang Vacuum Equipment Factory to develop the product. The product passed the ministerial appraisal in 1989. The machine has compact structure, complete functions, adjustable shelf spacing, and microcomputer-controlled program.
In addition, the Nuclear Energy Design and Research Institute of Tsinghua University has also introduced the advanced technology of vacuum freezing and drying equipment for large-scale foods in Russia, and directly cooperated with the national first-tier enterprise Yantai Ice Wheel Group to jointly explore a new road for the development of freeze-drying in China. The advantages of the developed equipment are: high starting point, low investment and quick results. At the same time of introduction, digestion and absorption, a practical and feasible solution was proposed for the improvement of the equipment, especially the design of the control system. Starting from the process requirements, while considering energy saving, the purpose of further improving efficiency was to use modern instruments and advanced technologies. The control means re-optimized the control system of the equipment and fundamentally improved the overall design and control level of the large-scale food freeze-dryer in China.
Improvement trend gradually dissociated from the foreign model road
Experts analyzed that most of the domestic food lyophilizer manufacturers are taking imitation roads. Some manufacturers have made major improvements while adopting advanced foreign technologies. If a special guide device is used in the heating plate, the flow rate of the fluid in the plate is even and the heating is even and stable; the water trap can alternately catch water and melt ice during operation, and the ammonia liquid cooling in the coil of the water trap can be realized. The method is changed from the traditional ammonia liquid phase change refrigeration to the ammonia liquid phase change refrigeration, so that the temperature of the water trap coil is uniform and the frost formation performance is good.
In addition to imitation, the domestic research and development capabilities are also improving. Some units have already deviated from the imitation of foreign models. The pumping system uses a low-profile steam jet pump to pump steam, eliminating the need for water traps and refrigeration systems, and reducing equipment. price.
Vacuum freeze-drying technology domestic research and development wings gradually (2)
In recent years, domestic food lyophilizers have developed rapidly and there are many manufacturers, and the quality, performance, and specifications and models vary. In the early 1950s, Wuhan, Beijing, and other biological products research institutes imported freeze dryers; in the 1960s, Beijing, Tianjin, Nanjing, Shanghai, Dalian, and other places successively established experimental freeze-dried food manufacturers. And has imitated a number of lyophilizers. Its characteristics are monolithic, shelf temperature is not uniform, manual operation, can automatically record; in the 1970s in Hubei Hubei designed a freeze dryer, using a single-stage two-stage compressor, can be covered in the bottle stopper; Shanghai A medium-sized freeze-drying plant with an annual output of 300 tons was established.
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