Introduction to the performance and characteristics of three vacuum drying equipment
2021-06-20 13:04:50
The vacuum dryer has many advantages: it has low oxygen content when dried under low pressure, can prevent oxidative deterioration of the dried material, can dry flammable and explosive dangerous goods; can vaporize moisture in the material at low temperature, and easily dry heat sensitive materials; It can recover valuable and useful ingredients in the dried materials; it can prevent the emission of toxic and harmful substances in the dried materials, and can become an environmentally friendly type of "green" drying. Therefore, the application of vacuum drying equipment is increasingly widespread.
The main disadvantage of the vacuum dryer is that it needs a vacuum system capable of pumping steam, which makes the equipment investment cost high and the operation cost high; the equipment production efficiency is low and the output is small. In order to overcome these shortcomings, many scientific and technological workers have made many efforts. At the same time, due to the many advantages of vacuum drying, some products have to use vacuum drying equipment. Therefore, the development of vacuum drying equipment will be promising. 1. Unbalanced development of continuous vacuum drying equipment at home and abroad In order to improve equipment output and ensure product quality, a variety of continuous vacuum drying equipment have been developed abroad more than ten years ago. However, due to the limitations of the technical level and people's perceptions, the development is relatively slow.
1) Belt continuous vacuum drying equipment
KK-VAQ belt continuous vacuum drying equipment manufactured by Japan Hiroshima Co., Ltd. is suitable for liquid materials, mud-like, paste-like concentration and high viscosity boring drying. The BV-100.5 vacuum belt continuous drying device produced by Okawa, Japan, uses steam and conduction heating. The temperature of each section is adjustable, and the belt tension and speed are adjustable. The Swiss company Buch-Gade has developed a range of belt-type continuous vacuum drying units with automatic cleaning.
Since 1995, he has been engaged in the design, manufacture, installation and service of belt continuous vacuum drying equipment, and the technology is relatively mature.
Domestic belt continuous vacuum drying equipment is rare. In 2004, Guangdong Agricultural Science Research Institute successfully developed a small test equipment for the drying of banana powder with good effect.
2) Grain continuous vacuum drying equipment
The amount of grain dried is large and continuous drying equipment must be used. In the past, many countries have developed a number of grain drying equipment, and vacuum dried grains are often used in seed drying because the vacuum drying cost is too high. In fact, this is a misunderstanding. According to the senior engineer of Zhengzhou Food Science and Design Institute He Xiang, the continuous corn vacuum drying equipment developed by them has a production capacity of 60t/d. The fixed investment is slightly higher than hot air drying, running cost and hot air. Dry and flat. If considering the quality of the dried product, the breakage rate of the drying process, the waisting rate, etc., the total cost of vacuum drying at low temperatures is not higher than that of hot air drying.
3) Continuous vacuum freeze drying equipment
The food is rich in raw materials and the output of the products that need to be lyophilized is large. Therefore, continuous food freeze-drying equipment appeared earlier. In 1985, the Danish company ATLAS produced the CONRAD–800 continuous freeze-drying equipment for the production of freeze-dried coffee with a production capacity of 13t per day.
The main disadvantage of the vacuum dryer is that it needs a vacuum system capable of pumping steam, which makes the equipment investment cost high and the operation cost high; the equipment production efficiency is low and the output is small. In order to overcome these shortcomings, many scientific and technological workers have made many efforts. At the same time, due to the many advantages of vacuum drying, some products have to use vacuum drying equipment. Therefore, the development of vacuum drying equipment will be promising. 1. Unbalanced development of continuous vacuum drying equipment at home and abroad In order to improve equipment output and ensure product quality, a variety of continuous vacuum drying equipment have been developed abroad more than ten years ago. However, due to the limitations of the technical level and people's perceptions, the development is relatively slow.
1) Belt continuous vacuum drying equipment
KK-VAQ belt continuous vacuum drying equipment manufactured by Japan Hiroshima Co., Ltd. is suitable for liquid materials, mud-like, paste-like concentration and high viscosity boring drying. The BV-100.5 vacuum belt continuous drying device produced by Okawa, Japan, uses steam and conduction heating. The temperature of each section is adjustable, and the belt tension and speed are adjustable. The Swiss company Buch-Gade has developed a range of belt-type continuous vacuum drying units with automatic cleaning.
Since 1995, he has been engaged in the design, manufacture, installation and service of belt continuous vacuum drying equipment, and the technology is relatively mature.
Domestic belt continuous vacuum drying equipment is rare. In 2004, Guangdong Agricultural Science Research Institute successfully developed a small test equipment for the drying of banana powder with good effect.
2) Grain continuous vacuum drying equipment
The amount of grain dried is large and continuous drying equipment must be used. In the past, many countries have developed a number of grain drying equipment, and vacuum dried grains are often used in seed drying because the vacuum drying cost is too high. In fact, this is a misunderstanding. According to the senior engineer of Zhengzhou Food Science and Design Institute He Xiang, the continuous corn vacuum drying equipment developed by them has a production capacity of 60t/d. The fixed investment is slightly higher than hot air drying, running cost and hot air. Dry and flat. If considering the quality of the dried product, the breakage rate of the drying process, the waisting rate, etc., the total cost of vacuum drying at low temperatures is not higher than that of hot air drying.
3) Continuous vacuum freeze drying equipment
The food is rich in raw materials and the output of the products that need to be lyophilized is large. Therefore, continuous food freeze-drying equipment appeared earlier. In 1985, the Danish company ATLAS produced the CONRAD–800 continuous freeze-drying equipment for the production of freeze-dried coffee with a production capacity of 13t per day.
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