Experimental Study And Numerical Simulation Of Self-inducing Reactor

Self-inducing reactor is a typical reactor that is widely used in gas-liquid two-phases reactions or gas-liquid-solid three-phases reactions.Understanding the hydrodynamic performance of self-inducing reactor is the basis for designing them.In this thesis,the hydrodynamic performance of single layered and double layered self-inducing reactor were studied,and the CFD simulation of single layered self-inducing reactor were carried out.For single layered self-inducing reactor:the critical impeller speed decreases with the increase of impeller diameter and blade number.However,using concave blade is not benefit for reducing critical impeller speed.At low impeller submergence,the reactor with large diameter has the minimum critical power consumption.At higher impeller submergence,the reactor with large diameter has the maximum critical power consumption.Increasing the blade number will increase the critical power consumption,but using the concave blade has little effect on the critical power consumption.Increasing the blade number does not contribute to gas-inducing rate while increasing the impeller diameter is benefit for gas-inducing rate.Using the concave blade is helpful for gas-inducing.When the top impeller is the self-inducing impeller and the bottom impeller is axial impeller or radial impeller,the bottom impeller structure has little influence on critical impeller speed.When the bottom impeller is WHu with the impeller spacing of one diameter,there achieves a good gas-inducing rate and gas holdup.The same Fr*curve can be used to describe the RPD,gas holdup and gas-inducing number when using the same bottom impeller.The simulation shows that gas formed two cycles above and below the impeller.The upper cycle has little gas and the lower cycle has more gas.The liquid velocity at the end of the blades is the biggest while the velocity near the elliptical part is small.The front surface of impeller blades has the highest static pressure and the lowest static pressure is on the back surface of the blade.