双供介高精度有压三产品旋流器分选流场

Separation flow field of secondary cyclone feed medium on three product cyclone

常规三产品旋流器的二段旋流器只能受一段旋流器的余压被动控制,无法实现主动、在线调节。为解决这一问题,在二段旋流器上新增了供介口,通过调节二段供介的参数改善二段旋流器的分选流场。通过数值模拟的方法,研究了二段供介的流量和密度参数对分选流场的影响,认为二段供介可以提供更高的压力梯度和切向速度,提高三产品旋流器的分选精度;根据生产需求调节二段供介参数,可以有效减少“中煤夹矸”和“矸中带煤”现象;拟合了二段供介的流量、密度对三产品旋流器出口密度的公式,对生产实践具有一定的指导意义。

The second stage cyclone of the conventional three product cyclone can only be passively controlled by the residual pressure of the first stage cyclone,and cannot achieve active and online adjustment.To address this issue,a new medium supply port has been added to the two-stage cyclone to improve the separation flow field by adjusting the parameters of the two-stage medium supply.Through numerical simulation,the influence of flow rate and density parameters of two-stage medium on the sorting flow field was studied.It was found that two-stage medium can provide higher pressure gradient and tangential velocity,improving the sorting accuracy of the three product cyclone;Adjusting the parameters of the second stage medium supply according to the demand can effectively reduce the phenomenon of"middling coal dirt band"and"gangue with coal";The formula for fitting the flow rate and density of the two-stage medium to the outlet density of the three-product cyclone has certain guiding significance for production practice.