Industrial development history of vibrating fluidized bed dryer

Fluidization technology originated in 1921 and was first applied to large-scale industrial production of drying. It was established by the United States in 1948 as Dole-
Olever solid fluidization device. And it was not until 1958 that China began to develop this technology. Fluidized bed dryers are divided into single-layer, multi-layer, and multi chamber types according to their structural forms. Vertical and horizontal. According to the additional devices, there are those with vibrators and those with indirect heating. According to the homework method, it can be divided into continuous and intermittent types. These are two commonly used classifications of fluidized bed dryers.
With the development of multipole drying, vibrating fluidized beds have been applied, and their basic structure is similar to that of ordinary fluidized beds. It is an improved product that applies mechanical vibration to the fluidized bed. The material is fluidized by the dual action of mechanical vibration and perforated airflow, and moves forward in the form of a piston under the vibration. By using convection, conduction, and radiation to supply heat to the material layer, the purpose of drying can be achieved.
Due to the fact that material transportation in a vibrating fluidized bed is accomplished through vibration, the supplied hot air is only used for heat and mass transfer, thus significantly reducing energy consumption. In addition, due to the strong vibration of the bed, the resistance of heat and mass transfer is reduced, which improves the drying rate of the vibrating fluidized bed. At the same time, it enables the smooth drying of fast or highly dispersed materials that are not easily fluidized or are prone to large amounts of entrainment during fluidization, overcoming the phenomena of backmixing, channeling, and wall sticking that are prone to occur in ordinary fluidized beds. This equipment not only has good drying function, but also can be equipped with processes such as material granulation, cooling, screening, and transportation according to process requirements. At present, it has been widely used in industries such as chemical, pharmaceutical, food, grain, salt industry, and mining and metallurgy. This technology is basically mature and has formed a series.