基于微气泡强化的浆态床反应器流体力学特性

Fluid mechanics characteristics of microbubble enhanced slurry bed reactor

采用电导探针和Pavlov管研究了微气泡对浆态床反应器内气含率和轴向液速的影响规律。实验结果表明,随着微气泡进气比(Qg-micro/Qg)的增加,平均气含率先增加后减小,最佳Qg-micro/Qg为0.28,反应器底部中心局部气含率显著增加,壁面局部气含率变化较小;随着Qg-micro/Qg增加,反应器底部中心轴向液速逐渐变大,而壁面附近液速方向始终向下;随着反应器轴向高度的增加,气体分布器对局部气含率和轴向液速的影响逐渐减弱,局部气含率径向极差变小,轴向液速的径向分布曲线更加平坦。

The effects of microbubbles on gas holdup and axial liquid velocity within the slurry bed reactor were investigated using conductivity probes and Pavlov tubes.The experimental results show that as the microbubble intake ratio(Qg-micro/Qg)increases,the average gas holdup initially increases and then decreases,with an optimal Qg-micro/Qg of 0.28,and the local gas holdup in the center of reactor bottom increases significantly,while that near the wall changes less.Besides,the axial liquid velocity in the center of reactor bottom increases with the Qg-micro/Qg,while the direction of liquid velocity near the wall is remained downward.However,the influence of the gas distributor on gas holdup and axial liquid velocity gradually weakens with an increase of the axial height of the reactor,resulting in a smaller radial difference in the gas holdup and a flatter radial distribution curve of axial liquid velocity.