PDC型旋风管灰斗内流场的测试与分析

MEASUREMENT AND ANALYSIS OF FLOW FIELD IN DUST HOPPER OF PDC TYPE CYCLONE TUBE

采用智能型五孔球探针测试技术 ,重点对PDC型旋风管灰斗内排尘口处的流场进行了测量研究 ,对有关操作参数与结构参数的影响进行了对比分析 ,得到了灰斗内排尘口处的流动分布规律 ,并对排尘口处的上行流率进行了计算 .

The third-stage multicyclone separator is widely used in FCC unit. To improve the performance of cyclone tube, a new type of PDC series was developed. The flow field, especially in the dust hopper, is measured by using five-hole probe. This measurements give the 3D velocities and pressure distribution. It was found that there exists Swirl Shield Action (SSA) near the discharge port in the dust hopper. It can reduce the re-entrainment in the hopper, and result in higher performance of cyclone tube. It was also found that both the structure and operation parameter could affect SSA. Keeping a suitable draw-off gas ratio, optimizing the structural parameters of guide vane and providing an anti-entrainment hole on the double cone are helpful to forming SSA in the dust hopper.