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首页> 外文期刊>Chemical Engineering & Technology: Industrial Chemistry -Plant Equipment -Process Engineering -Biotechnology >Direct Measurements of Instantaneous Solid Flux in a Circulating Fluidized Bed Riser using a Novel Multifunctional Optical Fiber Probe
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Direct Measurements of Instantaneous Solid Flux in a Circulating Fluidized Bed Riser using a Novel Multifunctional Optical Fiber Probe

机译：使用新型多功能光纤探头直接测量循环流化床立管中的瞬时固体通量

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摘要

With a novel optical fiber probe that can measure instantaneous local particle velocity and solid concentration simultaneously,extensive experiments were conducted to study transient flow structures in a 15.1-m long circulating fluidized bed(CFB)riser of 100 mm in diameter.This study analyzed the radial and axial distributions of solid concentration,particle velocity,and their variations with nine operating conditions and at six axial levels.Instantaneous local solid concentration and particle velocity were found to be well correlated at most of the radial positions.The detailed time evolution,axial and radial distribution of instantaneous solid flux,and the variation of solid flux with operating conditions were also investigated.The radial solid flux profile showed a flat shape with a maximum at near wall area under most operating conditions.The instantaneous solid flux was found to have a strong fluctuation at a radial position of r/R = 0.8 ~ 0.9.
机译：利用一种可以同时测量瞬时局部粒子速度和固体浓度的新型光纤探头，进行了广泛的实验，研究了直径为100 mm的15.1 m长的循环流化床（CFB）立管中的瞬态流动结构。固体浓度，颗粒速度及其在9个工况和六个轴向水平下的径向和轴向分布及其变化。在大多数径向位置处，瞬时局部固体浓度和颗粒速度之间存在很好的相关性。详细的时间演化，轴向还研究了瞬时固体通量的分布，径向分布以及固体通量随操作条件的变化。在大多数操作条件下，径向固体通量分布图呈扁平状，在近壁区域具有最大值。在径向位置r / R = 0.8〜0.9时波动很大。

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