液体粘度对三相流化床局部相含率径向分布的影响

Effect of liquid viscosity on radial distribution of local phase holdups in gas-liquid-solid three-phase fluidized bed

应用开发的微电导探针测试技术，以粒径分别为0．48mm、0．80mm、12．5mm的玻璃珠和1．45mm的苯乙烯树脂为固相，空气为气相，水和0．05％（wt％）、0．20％（wt％）的羧甲基纤维素钠（SCMC）为液相，对三相流化床的各相局部相含率进行了同时测定。在不同液体粘度下，局部固含率在r／R=0．75-0．85范围内有一个极大值；局部气合率呈现出塔中心处最大，塔壁处最小的分布规律。表明液体粘度对局部相含率径向分布均有不同程度的影响。

Local phase holdups in gas - liquid - solid three - phase fluidized bed of 150 mm i.d.and 4 350 mm height with small size particles are measured simultaneously by micro - electrical conductivity probe technique in this paper. The experiments are carried out with 0.48 mm, 0.8 mm and 1.25 mm small size glass beads （98 = 2 460 kg. m^- 3 ） and 1.45 mm styrene （ ρs = 1 264 kg. m^- 3 ）, with air and with water,0.05%（mass）SCMC,0.20%（mass）SCMC as solid phase and gas phase and liquid phase respectively. A sets of experimental data of local phase holdups in radial direction are obtained under different liquid viscosity. It has been found that the distribution of local solid holdup has a maximum peak at r/R = 0.75 - 0.85. The distribution of local gas holdup in radial direction has a maximum value at the coltumn center and a minimum value near the wall. The effect of the liquid viscosity on the radial distribution of local phase holdups is presented.