Abstract:

The gas-solid two-phase flow in the guide vane cyclone tube with different dust discharge structure is studied by numerical simulation method.The studies show that the downward flow and upward flow pass through the same discharge section of the cylinder type discharge structure，so the upward flow may entrain fine particles from the hopper and result in poor performance of the cyclone.With the cone shape discharge structure，the gas flow rotation in the cyclone is improved and the downward flow can be controlled，which is helpful to obtain better performance.However，vortex flow is found in the discharge cone，which will cause flow erosion to the wall of cyclone tube.The opening slots in the wall of discharge cone can change the state of gas-solid two-phase flow，which give different paths for discharge flow and upward flow，stabilize the flow in the hopper，avoid the entrainment of particles from the hopper，so that the performance of cyclone tube is improved.

Key words: 旋风管, 排尘结构, 气固两相流

摘要：

通过数值模拟的方法对3种不同排尘结构的导叶式旋风管内气固两相流场进行了研究。结果表明，直筒型排尘结构的排尘口处上、下行流交错容易产生返混夹带现象，对细颗粒的分离不利;锥形排尘结构可以增加旋风管内气流旋转强度，控制进入灰斗的下行气量，有利于分离效率的提高，但排尘锥内部存在环形旋涡，易磨损器壁;在排尘锥侧面开缝，可改善旋风管内流动分布状态，实现排尘区气固两相分流，进入灰斗内的气流更加稳定，从而有效减少颗粒返混夹带，提高旋风管分离性能。

关键词: 旋风管, 排尘结构, 气固两相流