摘要
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。
PIV（Particle Image Velocimetry） system was applied to study the velocity distribution and the variation laws of the particles in the circulating turbulent fluidized bed（C-TFB） at various height of stationary bed, various operating gas velocity and various section height. Test was conducted on the C-TFB whose main body size was 2.00 m×0.40 m, and PIV system was applied to test the riser at various section height. According to the final velocity vector diagram obtained from the test, the particle velocity was analyzed. The results showed： the greater the operating gas velocity U0 was, the greater the forward axial velocity was and the less the backward axial velocity was, which indicated that appropriate addition of U0 decreased the back mixture of particles so as to enhance the reactor productivity. The increase in the height H0 of stationary bed had slight impact on particle velocity, while the material content in the bed increased, which showed the large processing capacity of the C-TFB reactor. The motion of particles at various section height differed greatly, the higher the section was, the gentler the particle velocity was, which indicated the particle velocity was closely related to the riser dimension.
出处
《矿山机械》
2017年第3期46-51,共6页
Mining & Processing Equipment
关键词
循环湍动流化床
粒子图像测速系统
颗粒速度
circulating turbulent fluidized bed
PIV（particle image velocimetry）
particle velocity
