气-液-固三相循环流化床局部相含率分布

Distribution of local phase holdups of gas-liquid-solid three-phase circulating fluidized beds

应用自行开发的微电导探针测试技术,以玻璃珠(dp=0·48mm,ρs=2460kg·m-3)和苯乙烯颗粒(dp=1·45mm,ρs=1264kg·m-3)为固相,空气为气相,水及0·05%、0·20%(质量)SCMC(羧甲基纤维素钠)水溶液为液相,对三相循环流化床(TCFB)的各相局部含率进行了同时测定.考察了不同表观液体速度、辅助液体速度、液体黏度及颗粒密度对局部相含率轴径向分布的影响.在不同操作条件下,获得了1286套局部相含率实验数据.给出了局部固含率和局部气含率与操作条件、流体物性及床层轴径向位置的关联式,关联式的计算值与实验值吻合较好.

Local phase holdups in gas-liquid-solid three-phase circulating fluidized beds with glass beads （dp=0. 48 mm, ρs=2460 kg · m^-3） and styrene resin （dp=1.45 mm, ρs=1264 kg · m^-3） as solid phases were measured simultaneously by the improved micro-conductivity probe technique with air as gas phaseand water and 0. 05%（mass）, 0.20% （mass） SCMC as conditions. The axial and radial distributions of local phase conditions, liquid viscosity values and particle density values. phases under a wide range of operating ldups were studied under different operating 1286 sets experimental data were obtained.Correlations of local solid holdup and gas holdup as a function of operating conditions and fluid physical properties as well as axial and radial distances were established respectively. The calculated local solid holdup and gas holdup distribution profiles were compared with those measured by the micro-conductivity probe technique. The correlations could describe well the distribution of local solid holdup and gas holdup observed experimentally.