多尺度能量分析在气固流化床颗粒浓度信号分析中的应用

Application of Multi-Scales Energy Analysis to Particle Concentration Fluctuation Signal in Gas-Solid Fluidized Bed

在90 mm×1 000 mm 的有机玻璃流化床中,采用 PV4A 颗粒测速仪测定了不同粒径的河沙、聚氯乙稀(PVC)颗粒在操作气速为0.218～0.524 m/s 下不同轴/径向位置的颗粒浓度波动信号,考察了颗粒浓度波动信号多尺度分解的尺度,以及代表颗粒和各不同尺寸气泡运动的细节信号的能量分率与操作条件的关系。研究表明,各尺度下细节信号的能量分率随操作气速、轴向距离增大而增加,随径向距离增大而减小。

In a gas-solid fluidized bed （（890 mm × 1 000mm）, the fluctuation signal of particle concentration for sand and polyvinyl chloride （PVC） with different diameters were measured by the PV4A particle velocity analyzer at different axial and radial positions under the gas velocity 0. 218-0. 524 m/s. The multi-scale decomposition scale of fluctuation signal for the particle concentrations was studied by wavelet transform, and the relationship between the energy percentage of detail signal at different scales and the experimental conditions was investigated. The results showed that the energy percentage of detail signal at different scales for fluctuation signal increased with the increase of operating gas velocity and the rising of axial distance, and decreased with the rising of radial distance.