双螺旋锥形混合器叶片结构对颗粒混合的影响

Effect of screw structure on granular mixing in a double-screw conical mixer

采用离散单元法(DEM),通过数值模拟研究双螺旋锥形混合器的叶片结构对颗粒混合的影响.研究主要考察螺径比(双螺旋叶片的螺距和螺旋直径的比例)以及螺旋直径比(较短螺杆和较长螺杆的螺旋叶片直径的比例)对混合器混合效率、设备功率、设备磨损等的影响.结果表明,不同双螺旋锥形混合器的叶片结构对颗粒的混合、设备功率、设备磨损产生影响,但是总体而言,在不同叶片结构的混合器中,颗粒经过100 s的混合之后都能够达到完全混合状态.当保持其他参数不变时,随着螺径比的增大,混合器混合效率基本一致,设备功率增大,而设备磨损减小;随着螺旋直径比的增大,混合器混合效率有所提升,设备功率增大,而设备磨损并没有显著的改变.

The effects of different types of screws on granular mixing in a double-screw conical mixer were investigated by discrete element method(DEM).Specifically,the effects of the pitch diameter ratio(the ratio of the pitch to the diameter of the screw)and the screw diameter ratio(the ratio of the short screw diameter to the long screw diameter)on the mixing efficiency,device power and wear rate of the device were studied.Results show that different types of screws will affect the granular mixing,the device power as well as the device wear,however,the particles all can be well mixed after 100 s in the double-screw conical mixer with different screws.When other parameters remain unchanged,with the screw diameter ratio increasing,the mixing efficiency keeps similar,and the device power increases,but the wear rate of the device decreases.With the screw diameter ratio increasing,the mixing efficiency increases,and the device power increases,but the wear rate of the device fluctuates within a certain range.