Effects of vortex finder length on flow field and collection efficiency of cyclone in an industrial‐scale circulating fluidized bed boiler: Numerical study,International Journal of Energy Research

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Effects of vortex finder length on flow field and collection efficiency of cyclone in an industrial‐scale circulating fluidized bed boiler: Numerical study
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-04-28 , DOI: 10.1002/er.5430
In Sik Hwang ₁ , Hyo Jae Jeong ₂ , Jungho Hwang ₁

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Cyclone separators are key components of circulating fluidized bed (CFB) boilers. The factors that can affect the cyclone performance include body diameter, total height of the cyclone, and diameter and length of the vortex finder (VF). In this study, the effect of the VF length on the cyclone performance in a 340‐MWe CFB boiler operated by Korea South‐East Power Corporation was analyzed using computational fluid dynamics. A dense discrete phase model with kinetic theory of granular flow approach was employed for modeling the interactions of sand with a gas phase. As the VF length decreased, the unexpected short‐circuit flow around the VF reduced the pressure difference between the center and the cyclone wall. This reduced the swirl intensity, decreasing the natural vortex length. As the VF length increased, the short‐circuit flow decreased, along with the pressure difference and swirl intensity, reducing the natural vortex length. Thus, increasing the VF length beyond a certain value is not recommended, and there is an optimum VF length for maximizing the cyclone collection efficiency.

中文翻译：

旋流器长度对工业规模循环流化床锅炉内流场和旋风分离器收集效率的影响：数值研究

旋风分离器是循环流化床（CFB）锅炉的关键组件。可能影响旋风除尘器性能的因素包括机身直径，旋风除尘器的总高度以及涡旋探测器（VF）的直径和长度。在这项研究中，使用计算流体力学分析了VF长度对韩国东南电力公司运营的340 MWe CFB锅炉中旋风分离器性能的影响。采用具有颗粒流动力学理论的致密离散相模型来模拟砂与气相的相互作用。随着VF长度的减小，VF周围意外的短路流减小了中心与旋风分离器壁之间的压力差。这降低了涡旋强度，减小了自然涡旋长度。随着VF长度的增加，短路电流减小，以及压力差和旋流强度，减少了自然涡旋长度。因此，不建议将VF长度增加到超过某个值，并且存在用于最大化旋风收集效率的最佳VF长度。

更新日期：2020-04-28

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