Modern dryer began to use intermittent fixed bed dryer. 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 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 and high-productivity fluidized bed and gas-flow dryer appeared successively. The freezing sublimation, radiation and dielectric dryer provide new means to meet the special requirements. The far-infrared and microwave drier was developed in the 1960s.
In modern times