Abstract：To solve the problem of low thermal efficiency in the process of drying sludge in roller dryer, the drying process was simulated by Fluent software and EDEM softwares. Considering the collision of granular material and the thermal traction to material, the influence of roller structure on motion path and drying efficiency of materials was investigated. The concept of virtual heat absorption was put forward to describe the complex gas-particle two-phase heat exchange process when the material was dried by heating. By simulation， the effects of hopper plate distribution and feed screw length on motion path and drying efficiency of material in the roller were analyzed to conduct design optimization. The results demonstrate that for the roller dryer with a certain specification, the distribution of hopper plates in the roller dryer is important affecting factor on thermal efficiency. After improving the distribution of hopper plate and the length of feed screw, the thermal efficiency of roller dryer can be increased by 11.2%.
2018, Vol. 39 
