The problem of mixing and mass transfer in 60m3 xylanase stirred tank was investigated by CFD simulation.First,the primary impeller was simulated and studied by CFD with MUSIG model. Then in term of result of simulation a kind of project to solve this problem was proposed,and then was simulated by the same CFD model.Air volume fraction,volume mass transfer coefficient,mean diameter of gas bubble and shaft power was compared,and results showed performance of oxygen dissolved was improved.Finally,results of s...