不同入口截面角旋风分离器的分离特性

Separation Characteristics of Cyclones Separators with Different Inlet Section Angles

对常规旋风分离器的进口结构进行了改进:使得旋风分离器的入口具有一定截面角。利用计算流体动力学(CFD)技术对具有不同入口截面角旋风分离器的气相流场进行了数值模拟,比较了不同入口截面角时旋风分离器内部流场结构,并对不同入口截面角旋风分离器的压力损失和分离效率进行了实验研究。结果表明:进口具有一定截面角使得旋风分离器内部流场朝有利于颗粒分离的方向变化,可以有效改善旋风分离器的分离性能。在相同的入口风速下,随着入口截面角的增加,旋风分离器总效率和分级效率增加,而压力损失却减小。综合压力损失和效率随入口截面角的变化趋势,可以看出,在所研究的入口截面角范围,45°应是最佳的选择。

The improvement of the inlet geometry of the cyclone separator is conducted based on the previous works in this study,i.e.,the inlet geometry has a certain inlet section angle. The gas flow fields in cyclone separators with different inlet section angles were calculated by means of computational fluid dynamics （CFD）,and the inner flow field geometry of these cyclone separators were compared.At the same time,the pressure drops and separation efficiencies of these cyclone separators were studied by experiments.The results indicate that the inlet section angle can make the flow filed in the cyclone separator be propitious to particle separation,and improve the separation performance effectively.At the same inlet velocity,with the increase of the inlet section angle,the total separation efficiencies and grad efficiencies also increase,and the pressure drops reduce greatly.Combining the change trends of the pressure drop and separation efficiency,a conclusion can be obtained：for the range of the inlet section angle in this study,the optimal angle should be 45°.