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China Drying Network News China's dryer industry development, although China's dryer industry started late, but has entered a more mature stage of development, domestic dryer in chemical, pharmaceutical, food, textile, paper and other industries play a huge The role. It is believed that with the continuous development of science and technology, China's dryer technology will certainly be able to make greater breakthroughs in the future development.
Drying equipment
In industrial production, there are many materials or finished products that need to be stored in a dry environment for a long time. This is because in a humid environment, microorganisms can easily be bred and moldy and bad can be caused. For example, textile enterprises store fabrics, and food processing companies store grain. Before wood processing, the wood must be dried so as not to cause deformation after processing and molding. Like the storage of grain, in the past, we used natural air-drying and solar irradiation to bring foods to a certain degree of dryness. In ancient times, in order to enable food to dry faster, the use of ventilated openings with large air flow characteristics to speed up the drying of grain, this is considered the earliest "natural" drying box.
However, with the rapid development of modern society, the requirements for improving the efficiency of all walks of life are also very urgent. The effect of drying materials through natural wind can no longer meet the needs of modern industrial development. Under this demand, the emergence of dryers has achieved an increase in the drying efficiency of materials or finished products in the industry. The dryer in the true sense appeared in the middle of the 19th century. The industrial revolution liberated the productivity and improved the production efficiency. Especially the productivity of the textile industry was greatly increased. Therefore, the demand for dryers was great, and the dryers became mass-produced. The production of dryers developed independently as a separate industry. After more than 100 years of continuous progress, the structure of dryer products has also been gradually improved. Various types of dryers are suitable for special drying needs of all walks of life. In particular, the appearance of far-infrared and microwave dryers in the 20th century means that the drying technology has shifted from simple wind drying and thermal drying in the past to a higher technological level.
The start of the dryer industry in China is very late for developed countries. However, through continuous exploration of the dryer industry in our country, we have also achieved definite results in dryer technology. At present, China's dryer industry has formed a considerable industrial scale. The dryers produced have been able to fully meet the needs of the domestic market and ended the history of China's industrial drying relying on imported dryers.
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Modern dryers started using fixed-bed dryers that operated intermittently. In the middle of the 19th century, the use of tunnel dryers marked the development of dryers from continuous operation to continuous operation. Rotary drum dryers achieve better agitation of the granular material, which increases the drying capacity and strength. Some industries have developed continuous operation dryers adapted to the requirements of the industry, such as drum dryers for the textile and paper industries.
In the early 20th century, spray dryers were used in dairy production to provide a powerful tool for large-scale drying of liquid materials. Since the 40's, with the development of fluidization technology, high-intensity, high-productivity fluidized bed and air-flow dryers have emerged one after another. The cryogenic sublimation, radiation and dielectric dryers provide new means to meet special requirements. In the 60s, far infrared and microwave dryers were developed.
There are many types of mechanical equipment used for drying operations. According to the operating pressure, it can be classified into normal pressure and reduced pressure (a vacuum drying machine is also called vacuum drying machine). According to the operating method can be divided into intermittent and continuous. According to the drying medium can be divided into air, flue gas or other drying medium. According to the movement (material movement and drying medium flow) can be divided into co-current, countercurrent and cross-flow.
According to the operating pressure, the dryer is divided into normal pressure dryer and vacuum dryer . The operation under vacuum can reduce the wet partial pressure of steam and accelerate the drying process, and can reduce the moisture boiling point and the material drying temperature. Leakage, therefore, vacuum dryer is suitable for drying heat-sensitive, easily oxidized, explosive and toxic materials and wet vapors need to be recycled.
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