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On the basis of the mathematical model, the equations have been derived. They are simulated by VB program language. The residence time and the position of a particle at any moment can be defined according to rotational speed of the rotary dryer, radius of the drum, the slope of the drum, wind-force and the particle quality. Simulated results are satisfactory.
The research was done in the rotary dryer. It included variations of hot air temperature of entrance to the rotary dryer, moisture content of materials, rotational speed and inclination. The experiment indicates that rotational speed directly interferes with retention period of materials in the rotary dryer. Hot air temperature and moisture content of materials also interfere with drying rate of materials.
In the paper, extended-circular flights characteristics of rotary dryers is researched. On the basis of the mathematical model, a set of equations has been derived to calculate the solids holdup on extended-circular flights in such dryers. The solids holdup and its ratio to the maximum are explored. A kind of practical rotary dryer is simulated by VB program language. The simulated results, obtained...
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