Abstract：A casing-rotational vertical screw conveyor was desighed, discrete element method was used to establish the relationship between the design parameters and its performance, and shale particle was transported to verify the feasibility of casing-rotational vertical screw conveyor. The results show that the casing-rotational vertical screw conveyor has the following characteristics. The filling rate, conveying capacity, driving power and mechanical efficiency of casing-rotational vertical screw conveyor can be adjusted by changing casing rotation speed.The higher the casing rotation speede is the lower. filling rate.When the casing rotation speed of simulation model below160 r/min, conveying capacity is increased with the casing rotation speed increased. When the casing rotation speed of simulation model higher than 160 r/min, conveying capacity decline with the casing rotation speed increased. Driving power increases with the casing rotation speed increased. Energy efficiency increases with the increasing speed of the casing. The structure is simple because it has no need of forced feeding device and intermediate bearings are not required at a given conveying height. It can run with low speed, and it is beneficial to reduce mechanical wear and increase equipment life. Energy efficiency is higher and more energy-saving when the equipment runs with low speed.

Keywords: granular material; vertical screw conveyor; casing rotation; stationary helical blade