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化工学报  2015 

循环流化床中颗粒振荡循环现象的实验研究

DOI: 10.11949/j.issn.0438-1157.20150647, PP. 2929-2939

Keywords: 循环流化床,颗粒振荡循环,流动结构,压降

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Abstract:

颗粒的循环特性是循环流化床研究的重点及热点之一,在建立颗粒循环时,颗粒循环由非稳态向稳态过渡。本文在循环流化床实验装置中,采用摄像法和压力检测法研究了不稳定颗粒循环条件下颗粒流动结构和各段压降的变化情况。首次发现了不稳定颗粒循环状态下的颗粒振荡循环现象及其具有的两个特征:下降段、提升段气固流动结构呈周期性变化;下降段压降pd和提升段压降pr周期性波动且pd>pr和pd

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