液固两相外循环流化床压力波动信号的统计及频谱分析

压力波动信号是表征流化床内流体运动特性的重要信息. 为了更好地了解液固外循环流化床内流体流动特征，在液固外循环流化床中，对床体壁面压力波动信号进行了时域、频域及自相关性分析. 结果表明，沿床体稳定流化段上的压力波动特征相似，流体流动和颗粒运动所引发的压力波动能量频带分别集中在0~10和30~40 Hz之间，压力波动的概率密度近似呈正态分布，液固两相外循环流化床中的压力波动信号介于周期信号和随机信号之间.

Statistical and Frequency Analysis of Pressure Fluctuations in Liquid-Solid Exterior Circulating Fluidized Bed

The pressure fluctuation is important information that can be used to indicate the dynamic characteristics of the fluidized bed. In order to find out the flow characteristics of the liquid-solid exterior circulating fluidized bed, the time-domain analysis, frequency-domain analysis and correlation analysis were carried out with the wall pressure fluctuations in the liquid-solid exterior circulating fluidized bed. it was found that the pressure fluctuations at different positions were the same in the steady fluidization segment, the power distribution frequency ranges generated by the liquid flow and the motion of the particles concentrated in 0-10 Hz and 30-40 Hz. The probability density function was close to the normal distribution, and the pressure fluctuations signal existed between the periodic and random signals.