Numerical Simulation And Experimental Study On Stirred Characteristic Parameters Of Gas-inducing Reactor

Gas-inducing reactor (GIRs) is a sort of gas-liquid reactor with the advantages of simple construction, low power consumption and predominant mass transfer, compared with stirred tanks.The hydrodynamic characteristics of gas-inducing reactor with single layered mixer:the critical gas suction speed decreases with the increase of the diameter of the mixer and increases with the increase of the submergence; the gas suction rate increases with the increase of the mixer speed and decreases with the increase of the submergence, best gas suction efficiency exited, obtained an empirical formula of gas suction; overall gas holdup and volumetric oxygen mass transfer coefficient all increases with the increases of the power consumption; the relative power PG/P decreases with the increase of the mixer speed after exceed the critical gas suction speed; with the increase of the liquid viscosity, the critical gas suction speed increases, the gas suction rate decreases and the best gas suction efficiency move in the direction of the unit volume power consumption increases.The hydrodynamic characteristics of gas-inducing reactor with double layered mixers: the effect of lower mixer form on the critical gas suction speed is very small; use the axial flow lower mixer, the gas suction rate increases first and then decreases with the decrease of impeller clearance. use the radial flow lower mixer, the gas suction rate increases with the decrease of impeller clearance; the overall gas holdup of reactor decided by the power number of lower mixer under the unit volume power consumption; relative power PG/P, the downward lower mixer decreases rapidly, the upward lower mixer decreases slowly.A mathematical model of gas-liquid (air-water) two phase flow was established, numerical simulation study of the internal flow field distribution, local gas holdup distribution and pressure field distribution of the GIRs were carried out, the simulation results and the experiment results are in good agreement. It is proved that CFD technology, based on optimal design and scale-up, is a kind of potentially method for studying on all kinds of GIRs.