段继海,吴凯,陈光辉,李建隆

• 1:青岛科技大学化工学院生态化工国家重点实验室

摘要(Abstract)：

针对高效Stairmand型旋风除尘器内存在涡流的不稳定性流动和影响分离效率"摆尾"、"返混"情况,提出增设稳流柱和防返混锥以改善其涡流的紊乱状况。通过大涡模拟的数值方法研究稳流柱和防返混锥对流场以及涡流的影响情况,结果表明:增设导流件后的旋风分离器,内旋流区的流场更加规整,控制了涡流的紊乱程度,稳流柱对涡流起到指引和导向的作用。分离区的切向速度对称性良好,旋风分离器内静压,平均静压最大降幅为42%。稳流柱大大降低了湍动度和湍动耗散能,消弱了内旋流与外旋流间的扰动,湍动耗散能平均降低53%。实验结果还表明:增设导流件后的旋风分离器对于累积50%粒径为10.74?m的煤粉分离效率由90%提高到97%,阻尼系数和总压降略有提高。通过试验与数值模拟相结合的方法,研究了增设稳流件后旋风分离器的性能和流场变化规律。

关键词(KeyWords)： 高效Stairmand型旋风除尘器;稳流柱;防返混锥;计算流体力学与试验

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(21276132);; 山东省自然科学基金(ZR2011BQ006)

作者(Author): 段继海,吴凯,陈光辉,李建隆

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