Abstract: Recurrence plot and recurrence quantification analysis were used to analyze the pressure fluctuation signal, and particle flow characteristics at different numbers of biomass, quartz sands and different gas velocities were investigated. The quartz sands with the diameter of 0.8 mm and cylinder-shaped biomass particles with both diameter and length of 10 mm were used as bed materials. In the bubbling section, the periodicity of the system decreased first and then increased with increasing proportion of biomass. In the slugging section, recurrence plots of signal had the same textural feature in the fluidized-bed before and after biomass was added. The bubbling section determinism and laminarity flow rate increased with increasing gas velocity, and significantly decreased at a low proportion of biomass, but entropy of the system decreased with increasing gas velocity. The slugging section determinism and laminarity flow rate had a small change and entropy of the system decreased with increasing gas velocity, showing opposite tendency from the one-component system.

Key words: recurrence plot, recurrence quantification analysis, biomass, blend, fluidized-bed, chaos

摘要： 采用递归分析方法对流化床内的压力脉动信号进行分析，研究了不同工况下石英砂与柱形生物质颗粒混合双组分颗粒的流动特性。柱形生物质颗粒尺寸为10 mm×10 mm（直径×长），石英砂粒径为0.8 mm。在鼓泡床阶段，随着生物质含量的增加，系统的周期性呈现先减弱再增强的变化趋势；该阶段确定性与层流率均表现为随气速的增加而增大，其值在生物质含量低时会明显减小，系统熵则随着气速的增大而减小。在腾涌阶段，生物质添加前后系统信号的递归图呈现相似的纹理特征，确定性与层流率变化较小，此时熵随着气速的增加而减小，与单组分流动呈现相反的趋势。

关键词: 递归图, 递归定量分析, 生物质, 混合, 流化床, 混沌