不同结构的旋风分离器二次涡的数值模拟和分析

发布时间：2018-03-03 22:30

本文选题：旋风分离器　切入点：二次涡　出处：《高校化学工程学报》2017年05期 　论文类型：期刊论文

【摘要】：以Stairmand旋风分离器、扩散式旋风分离器和环流式旋风分离器为研究对象,采用CFD软件Fluent提供的湍流雷诺应力模型(RSM),研究了内部构件对旋风分离器内二次涡的影响,模拟结果表明:环流式旋风分离器内部导流件有效降低了"上灰环"和"短路流",与另两种旋风分离器相比,筒体顶盖及排气管附近二次涡速度分别从23.6和32.1 m×s~(-1)降至10.2和25.7 m×s~(-1),湍动强度分别由2.38%和3.41%减弱到1.61%和2.39%,筒体顶盖涡流尺度的比例因数由0.25减小为0.11。扩散式旋风分离器的反射屏对于削弱"二次扬尘"现象和"颗粒夹带"的影响效果显著,与Stairmand旋风分离器相比,排尘口附近二次涡速度由25.1降至7.3 m×s~(-1),尺度的比例因数、湍动强度均显著降低。结果表明通过合理的增设内部构件对分离器内流场进行导流,可降低二次涡对于流场的影响。
[Abstract]:Taking the Stairmand cyclone separator, diffusive cyclone separator and circulating cyclone separator as research objects, the turbulent Reynolds stress model provided by CFD software Fluent is used to study the influence of internal components on the secondary vortex in the cyclone separator. The simulation results show that the inner diversion of the circulating cyclone separator can effectively reduce the "upper ash ring" and "short circuit flow", compared with the other two cyclone separators. The secondary vortex velocities near the top of the cylinder and the exhaust pipe decreased from 23.6 and 32.1 m 脳 sf-1) to 10.2 and 25.7 m 脳 sf-1, respectively, and the turbulent intensity decreased from 2.38% and 3.41% to 1.61% and 2.39, respectively. The ratio factor of eddy current scale in the top of the cylinder was reduced from 0.25 to 0.11.The diffusive cyclone separation was carried out. The effect of the reflector screen on weakening the phenomenon of "secondary hoisting" and "particle entrainment" is remarkable. Compared with the Stairmand cyclone separator, the secondary vortex velocity near the exhaust outlet is reduced from 25.1 to 7.3 m 脳 s-1, and the scale ratio factor and turbulence intensity are all significantly reduced. The results show that the flow field in the separator can be guided by reasonable addition of internal components. The effect of secondary vortex on flow field can be reduced.
【作者单位】：青岛科技大学化工学院;
【基金】：国家自然科学基金(21276132) 山东省高等学校科技计划一般项目A类(J17KA107)
【分类号】：TQ051.8

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