关键词: 环流反应器, 压差法, 滑移速度, 气含率, 固含率

Abstract: 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.

Key words: airlift loop reactor, pressure difference method, slip velocity, gas holdup, solid holdup