细颗粒气固流化床内斜片挡板受力特性的实验研究

在一套方形有机玻璃冷模流化床实验装置中安装一片旋臂斜片挡板内构件，在改变流化床的表观气速、挡板距气体分布板的距离和挡板的倾斜角度的条件下，采用典型的FCC催化剂，通过动态应力仪和压力传感器分别对挡板所受应力和床层的压力脉动进行测量. 结果表明，挡板所受动态应力的主要频率范围在0~50 Hz，挡板所受平均正压力的均方根在表观气速为0.5~0.6 m/s(接近临界湍动气速)时存在一个最大值，靠近气体分布板和床层表面挡板的受力大于床层中部的挡板受力，挡板与水平面夹角为15o, 45o和60o时挡板受力较小.

Experimental Study on the Acting Forces on a Single Slant Slat Immersed in a Gas and Fine Particles Fluidized Bed

A single cantilever slant slat was installed in a cold-model fluidized bed of fine particles with a square cross section. The dynamic force on it during the operation of fluidized bed was measured by a dynamic stress meter. Meanwhile, the dynamic pressures in the bed were also measured by pressure transducers. The main influential factors considered were superficial gas velocity, installation height above the gas distributor and inclination angle of the slat. The results indicated that the main energy of dynamic stress on the slat dropped in the frequency range of 0~50 Hz. There was a maximum root mean square (RMS) of the dynamic stress at a superficial gas velocity of 0.5~0.6 m/s, which was near the transitional point between the bubbling and turbulent flow regimes. Along the height of dense bed, the RMS of stress was found to be lower when the slat was installed in the middle section of bed. At different inclination angles, there were minimal values of the stress RMS occurring at 15o, 45o and 60o.