单入口双进气道旋风分离器内冲蚀特性

Erosion Characteristic in a Single Inlet Cyclone Separator With Double Passage

采用雷诺应力湍流模型、离散相模型和改进的冲蚀模型对一种单入口双进气道旋风分离器内的气-固紊流及冲蚀过程进行了数值模拟,得到旋风分离器内壁面冲蚀速率详细分布规律。结果表明,固体颗粒对旋风分离器内壁的冲蚀主要发生在蜗壳上顶板、蜗壳与筒体连接段及排尘口处;在旋风分离器分离空间内,由上至下旋流稳定性逐渐减弱,导致壁面冲蚀速率逐渐增大。与普通单入口旋风分离器相比,在相同处理量时,单入口双进气道旋风分离器内形成的轴对称稳定旋流可以有效减弱颗粒与壁面的碰撞和磨削,从而明显降低壁面摩擦阻力损失和冲蚀速率,有利于旋风分离器的压降降低和长周期稳定运行。

The gas-solid multiphase turbulence flow and wall erosion in a single inlet cyclone separator with double passage were studied by using Reynolds stress model,discrete phase model and the advanced erosion model to obtain the detail wall erosion rate distribution.The results showed that the eroded region appeared in the volute roof,the transition section between the volute and the cylinder and the dust outlet in the cyclone separator.In the separation space of the cyclone separator,the vortex stability was weak gradually along the downward direction,leading to the increase of wall erosion rate.Compared with the common single inlet cyclone at the same process load,the axisymmetrical stable swirl of the cyclone with double passage contributed to weaken the particle collision and cutting of inner wall,by which the frictional resistance and the erosion rate dramatically decreased.Therefore,with this flow and erosion characteristic the pressure drop can be decreased to ensure the long period operation of the cyclone separator.