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试验采用粒子图像测速系统(PIV),研究了循环湍动流化床(C-TFB)在不同静止床层高度、不同操作气速、不同截面高度下颗粒速度分布及变化规律。试验在主体尺寸为2.00 m×0.40 m的C-TFB上进行,采用PIV系统对提升管不同截面高度进行测试,根据试验得到的最终速度矢量图对颗粒的速度进行分析。结果表明:操作气速U0越大,则轴向正方向速度越大,轴向负方向速度减小,说明适当增加U0可减少颗粒返混,提高反应器工作效率;静止床层高度H0的增加对颗粒速度影响较小,而床内物料含量增加,说明C-TFB反应器对物料的处理能力大;不同截面高度的颗粒运动变化差别较大,截面越高颗粒速度越趋于平缓,说明颗粒速度变化特征与提升管的尺寸密切相关。
The Particle Image Velocimetry (PIV) system was used to study the particle velocity distribution and variation of cyclic turbulent fluidized bed (C-TFB) at different static bed height, different operating gas velocities and different section heights. The test was carried out on a C-TFB with a body size of 2.00 m × 0.40 m. The PIV system was used to test the height of different sections of the riser. The velocity of the particles was analyzed according to the final velocity vector chart. The results show that the larger the operating gas velocity U0, the larger the axial positive velocity and the negative axial velocity. This shows that increasing U0 can reduce the particle backmixing and improve the working efficiency of the reactor. When the static bed height H0 increases The effect of material on the C-TFB reactor is large. The movement of particles with different cross-sectional height is quite different. The higher the cross-section, the more the particle velocity tends to be gentle, which shows that the particles The speed variation is closely related to the size of the riser.