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Dryer is a kind of by heating the material moisture (generally refers to water or other volatile liquid ingredients) vaporizing escape, to get the rules of the moisture content of solid materials machinery and equipment, is a kind of the material drying process of mechanical equipment.
The modern dryer began to use a fixed bed dryer with intermittent operation. In the mid-19th century, the use of the tunnel dryer marked the development of the dryer from intermittent operation to continuous operation. Most industrial products need to be dried at a certain stage of production, and materials need to have a certain moisture content for processing, molding or granulation. The dryer can be classified according to different characteristics such as operating process, operating pressure, heating mode, wet material movement mode or structure.
Since ancient times, people have been accustomed to dry materials with natural heat source and natural ventilation, which is completely restricted by natural conditions and has low production capacity. With the development of production, they are gradually replaced by artificial controllable heat source and mechanical ventilation dehumidification.
The modern dryer began to use a fixed bed dryer with intermittent operation. In the mid-19th century, the use of the tunnel dryer marked the development of the dryer from intermittent operation to continuous operation. The rotary cylinder drier can realize the stirring of granule material, and the drying ability and strength can be improved. Some industries have developed the continuous operation dryer to meet the requirements of the industry, such as textile, paper industry, such as the drum dryer.
In the early 20th century, the application of spray dryer in dairy production provided powerful tools for large-scale drying of liquid materials. Since the 1940s, with the development of fluidization technology, high strength, high productivity fluidized bed and air flow dryer appeared successively. Freezing sublimation, radiation and dielectric drier provide new means to meet special requirements. The far infrared and microwave drier was developed in the 1960s.