【摘要】 为了研究耦合流化床边壁区固体颗粒的流动特性，采用压力传感器、PV-6型颗粒速度测量仪和PC6D型颗粒浓度测量仪测量了提升管轴向压降以及颗粒速度和浓度。结果表明：颗粒的下降速度为0.8～1.6 m/s。固体循环量、表观气速的增加使颗粒下降速度增加，总结得到颗粒速度与截面平均固体浓度关联式。增加固体循环量、减小表观气速使边壁区固体浓度和流量增加，但返混比的变化相对较小，并拟合得到了固体浓度与截面平均固体浓度关联式。因此对于耦合流化床，可以通过改变操作条件来调节边壁区固体颗粒的流动特性。更多还原

【Abstract】 In order to study the flow behavior in the wall region of a coupled fluidized bed, the axial pressure drop, particle velocity and solids holdup of the riser were measured by pressure sensor, PV-6 particle velocity measurement instrument and PC6D solids holdup measurement instrument. The results showed that the particle velocity ranges from 0.8 m/s to 1.6 m/s. With the increase of solids circulation rate and gas velocity, the descend velocity of particles increases. The correlation between particle velocity and cross-sectional solids holdup is obtained. Increasing solid circulation and decreasing gas velocity could increase the decreasing solids holdup and solid flow rate, but the change of backmixing ratio is relatively small and the correlation between the solids holdup and the cross-sectional solids holdup was obtained.Therefore, for the coupled fluidized bed, the flow characteristics of solid particles in the wall region can be manipulated by changing the operating conditions.更多还原