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化工学报  2012 

密相气力输送中气固两相流动特性多源信息分析

DOI: 10.3969/j.issn.0438-1157.2012.10.010, PP. 3070-3079

Keywords: 静电传感器,电容层析成像,气固两相流,分形

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Abstract:

在加压密相气力输送煤粉实验装置上,结合静电、压力传感器与电容层析成像系统(ECT)3种方法,利用统计学和分形方法研究了不同操作条件(总输送压差、输送载气和煤粉含水率等)下密相气固两相流动力学行为。结果表明:输送载气为CO2时,颗粒相微观运动剧烈程度随总输送压差(0.3~1MPa)的增大而增大,气流和颗粒相之间的相互作用在总输送压差0.75MPa下最强烈,但煤粉宏观整体的流动保持稳定;煤粉含水率增加对宏观流动稳定性没有影响,但水分增加使颗粒相的微观运动剧烈性减小;载气为N2时,管道截面煤粉的平均浓度及分布变化明显,宏观流动状态不稳定,但颗粒相的微观运动剧烈程度与载气为CO2时的变化规律一致。

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