摘要
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30-40Hz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．
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.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2006年第6期878-883,共6页
The Chinese Journal of Process Engineering
基金
河北省自然科学基金资助项目(编号:202016)
关键词
液固外循环流化床
压力波动
功率谱密度
时域分析
自相关分析
liquid-solid exterior circulating fluidized bed
pressure fluctuation
power spectral density
, time-domain analysis
autocorrelation analysis
