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为研究双支腿流化床支腿间颗粒交换特性,采用粒径为0.9～1mm的玻璃珠为床料,在尺寸为240mm×20mm×800mm的二维有机玻璃可视化双支腿流化床内,采集差压脉动信号对床内差压进行了功率谱密度及香农熵的分析,研究了颗粒在支腿间的质量交换、流化风速和床存量对颗粒交换的影响,以及颗粒交换行为的稳定性规律。研究结果表明,支腿间颗粒交换方式以颗粒团簇和单颗粒为主,分别对应第一主频和第二主频。流化风速的增加使2种颗粒交换方式所占的比重趋于相等,床存量的增加会加剧颗粒在支腿间的质量交换。流化风速和床存量的增加使两主频相互靠近。颗粒交换行为的稳定性和确定性随着气速的增加先增强后逐渐减弱。
In order to study the characteristics of particle exchange between legs of fluidized bed with double legs, the glass beads with particle size of 0.9 ~ 1mm were used as the bed material in a visualized two-legged fluidized bed with dimensions of 240mm × 20mm × 800mm , The differential pressure pulsation signal was collected to analyze the power spectral density and Shannon entropy of the differential pressure in the bed. The effects of mass exchange between the legs, fluidized air velocity and bed stock on particle exchange and particle exchange behavior Stability law. The results show that the mode of particle exchange between the legs is mainly particle clusters and single particles, corresponding to the first and second dominant frequencies respectively. The increase of fluidized wind speed makes the proportion of the two kinds of particle exchange modes equal to each other. The increase of bed stock will exacerbate the mass exchange between particles in the legs. The increase of fluidized air velocity and bed stock brought the two main frequencies close to each other. The stability and certainty of the particle exchange behavior first increase and then decrease with the increase of the gas velocity.