鼓泡流化床内颗粒旋转速度的实验研究

Experimental Research on Particle Rotation Speed in Bubbling Fluidizing Beds

为了获得鼓泡流化床内颗粒的旋转特性,利用双脉冲激光器与跨帧相机构成的测试系统对冷态鼓泡流化床内颗粒的旋转过程进行研究。结果表明:颗粒粒径越小,旋转速度越大;颗粒的水平分速度增大时,平均转速增大;颗粒的垂直分速度增大时,平均转速呈一定幅度的上下波动趋势;相对于垂直分速度大的颗粒,垂直分速度小的颗粒的转速有一定幅度的减小;在x轴方向上颗粒平均转速的分布趋势为先增大、后减小。

To obtain the rotation characteristics of particles in bubbling fluidizing beds, the rotation process of particles in cold bubbling fluidizing beds was studied by a measurement system composed of a dual-frequency digital camera and a sheet laser. The results show that the average rotation speed increases with decrease of the particle size. There is a strong growing tendency for average rotation speed as the horizontal component of translational speed increases. The average particle rotation speed fluctuates when the vertical component velocity of particles increases. The particles with small vertical component speed generally show a slight decrease tendency than those with large vertical component speed. The average rotation speed of particles increases first and then decreases along x axis.