摘要
本研究采用光纤激光多普勒测速仪（ＬＤＶ），通过两列信号处理系统，同时测定了气体和颗粒局部速度，研究了低密度循环流化床提升管内局部滑落速度的变化规律。实验结果表明，提高颗粒循环速率，在任一径向位置的气固滑落速度均增加；提高气体表观速度，反而使气固之间局部滑落速度减小。由于固体颗粒在近壁区的团聚行为，在近壁区气、固局部滑落速度出现一个极大值。
The local slip velocity between gas and solid in the riser of dilute circulating fluidized bed was investigated through the simultaneous measurements of local gas velocity and particle velocity by means of a fiber optic probe Laser Doppler Velocimetry(LDV).The experimental results show that the radial profiles of local slip velocity are non-uniform :flat in the central region and steep in the region near the wall. and a higher velocity value appears in the wall region. Experimental results also indicate that the cross-sectional average slip velocity calculated from one-dimensional pseudo-homogeneous model is far greater than the experimental local slip velocity.
出处
《高校化学工程学报》
EI
CAS
CSCD
1994年第2期157-164,共8页
Journal of Chemical Engineering of Chinese Universities
基金
中国自然科学基金
关键词
循环流化床
滑落速度
气体
固体
Gas-solid circulating fluidized bed, Slip velocity
