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首页> 外文期刊>Separation and Purification Technology >Simulation of the performance of small cyclone separators through the use of Post Cyclones (PoC) and annular overflow ducts
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Simulation of the performance of small cyclone separators through the use of Post Cyclones (PoC) and annular overflow ducts

机译：使用后期旋风分离器（PoC）和环形溢流管模拟小型旋风分离器的性能

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The cut-off diameter of a cyclone separator is directly related to its design, which in turn is based on the expected operational conditions. Consequently, if operational conditions change or if the priori conditions remain unchanged but the cut-off diameter must be decreased, the separator will probably display unsatisfactory performance, and a new design may be necessary. This work focus on two different approaches for increasing collection efficiency in small cyclone separators without any modifications in the cyclone body, namely the use of a PoC - Post Cyclone and the use of an annular tube on the overflow duct. Both approaches take advantage of the remaining swirl in the overflow duct. The results are obtained through CFD computations based on LES of the fluid flow inside the separator and a Lagrangian description of the dispersed phase. Results show that the PoC may be successfully applied to small size cyclone separators, increasing the collection efficiency even for particle diameters smaller than two micrometers. On the other hand, the annular outlet duct did not perform as expected and for the tested conditions, the increase in separation was directly related to the bleed flow rate. (C) 2015 Elsevier B.V. All rights reserved.
机译：旋风分离器的截留直径与其设计直接相关，而设计又取决于预期的运行条件。因此，如果操作条件改变或先验条件保持不变，但必须减小截止直径，则分离器的性能可能无法令人满意，因此可能需要进行新的设计。这项工作的重点是在不对旋风分离器主体进行任何修改的情况下，在小型旋风分离器中提高收集效率的两种不同方法，即使用PoC-后旋风分离器和在溢流管上使用环形管。两种方法都利用了溢流管中剩余的涡流。通过基于分离器内部流体的LES和分散相的拉格朗日描述，通过CFD计算获得结果。结果表明，PoC可以成功地应用于小型旋风分离器，即使粒径小于2微米，也可以提高收集效率。另一方面，环形出口管道的性能不及预期，并且在测试条件下，分离度的增加与排放流速直接相关。 （C）2015 Elsevier B.V.保留所有权利。

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