旋流器底流口调控方法的试验研究与数值模拟

Test study and numerical simulation on adjustment of cyclone apex

以水介旋流器为基础,在底流口中心插入实心锥棒与空心锥管,在锥棒和锥管不同的插入深度下,对此旋流器进行煤泥分选试验。试验结果表明,实心锥棒与空心锥管的插入深度大,精煤产率高、灰分高。相对而言,空心锥管可调范围宽。运用ANSYS软件对插入锥棒和锥管的旋流器流场进行模拟,模拟结果表明,有实心锥棒与空心锥管存在的旋流器内部依然有空气柱存在,锥部流体轴向速度随着锥棒与锥管插入深度的增加而增大。

Based on a water only cyclone, a new cyclone was designed with a solid conic bar or a hollow conic tube being inserted into the apex. The test for coal slime separation was conducted by using the cyclone at various insert depth. The results showed that the yield and the ash content of clean coal became higher with the increase in the insert depth. In addition, the adjusting range of the hollow conic tube was relatively larger. And then, ANSYS was applied to simulate the fl ow fi eld in the cyclone with a solid conic bar or a hollow conic tube. The simulation results showed: the air column still existed in the cyclone; axial velocity of conical fl uid enhanced with the increase in the insert depth of solid conic bar or hollow conic tube.