连续内环流三相反应器局部流动特性

在φ200 mm×2500 mm连续内环流三相反应器内，考察了空气 水 玻璃珠体系反应器内局部流动参数随操作条件的变化规律。结果表明，导流筒内截面平均气含率随表观气速的增大而增大，较之气液两相流，在低固含率时，加入固体对气含率影响不明显，而在较高固含率下，气含率有明显降低，但固体再增加时对气含率变化影响不大。在较低表观气速下，进料浆速对导流筒内气含率轴向分布趋势有一定的影响，但在较高表观气速下影响不大，导流筒内的气含率大于环隙内的气含率且随气速增大差别更加明显，浆相连续有利于气相分散并增大环隙内的气含率。导流筒内循环浆速径向分布呈抛物状，中心高、近壁处低，受进料浆速和入口固含率影响都不大。浆相循环强度最低为20，高可达180。固含率轴、径向分布受表观气速和进料浆速的影响，固含率轴、径向分布基本均匀，随进料浆速增加，反应器内固含率降低。

Local flow characteristics of gas-liquid-solid multiphase continuous loop reactor

The flow characteristics of a φ200 mm×2500 mm three phase continuous loop reactor with a draft tube were systematically investigated with glass beads as the solids phase，air as the gas phase and tap water as the liquid phase，respectivelyThe operating parameters，including superficial gas velocity，slurry feed velocity and inlet solids holdup in the range of interest in direct coal liquefaction，were varied to demonstrate their effects on the local distributions of gas and solids holdups and internal circulation slurry velocityThe local values of sectional average gas holdup in the draft tube increased with increasing superficial gas velocity，and decreased with increasing inlet solids loadingsVarying slurry feed velocity led to small effects on the local values and distributions of the sectional average gas holdup in the draft tube，while continuous feeding of slurry was helpful to the effective dispersion of gas phase and enhancing aeration in the annulusLocal slurry circulation velocities showed a parabolic profile in radial distribution with the lowest velocity at the central axis of the draft tubeThe slurry feed velocity and inlet solids loading had a small effect on slurry circulation，and the slurry circulation intensity defined as the ratio of circulating slurry velocity in the annulus to the feed slurry velocity was in a range JP+3]of 20—180.The axial and radial distributions of solids holdup were spatially uniform in the reactor，and were affected by superficial gas velocity and slurry feed velocity..