三相环流反应器中的局部相含率

将压差法与气-液相间滑移速度相结合，提出了利用压差法测量三相区局部相含率的新方法，将测得的局部固含率进行轴向平均并与由颗粒装填量计算所得的固含率进行比较，证明了此方法的可靠性. 利用所提出的测量方法，考察了三相环流反应器中气含率和固含率随操作条件的变化规律. 结果表明，气含率随表观气速的升高而增大，且随轴向位置的升高而增大；大颗粒具有破碎气泡的作用，能够增大反应器内的气含率；固含率随表观气速的增加而降低，且沿轴向变化较大. 表观气速较高时，固含率沿轴向近似呈S形分布.

The Local Phase Holdups of Three-phase Loop Reactors

Better understanding of the hydrodynamic behavior in three-phase airlift loop reactors (TPALRs) is important for their design and scale-up. In the present paper, combination of pressure difference method with gas-liquid inter-phase slip velocity was proposed to measure the phase holdups in TPALRs. The comparison between the measured axial-averaged solid holdups and those calculated from the solid loading shows that the used method is reliable. The gas holdup and solid holdup were experimentally studied with the proposed measuring method. The results show that the gas holdup increases with the increase in the superficial gas velocity, and increases along the axial position. Large particles can break bubbles and increase the gas holdup. The solid holdup decreases with the increase in the superficial gas velocity, and its variation along the axial position is more remarkable than that of the gas holdup. The solid holdup decreases with the increase in the superficial gas velocity. At high superficial gas velocities, the solid holdup has an S-type axial profile.