Dynamic simulation of mass transfer-reaction process in three-phase internal air-lift reactor
The three-phase internal air-lift reactor is widely used in fields such as sewage treatment and microbial cultivation.In this paper,a dynamic mass transfer-reaction model for the three-phase internal air-lift reactor is established,the model calculates the distribution and variation of the operation parame-ters such as gas-holdup,circulation liquid velocity,and oxygen content in the gas and liquid phases a-long the axial direction.At the same time,the model calculates the ratio of gas holdup between the down-comer and the riser and the gas reflux ratio at the top of the reactor under different operating conditions,with values ranging from 0.75-0.89 and 0.44-0.52,respectively.Finally,the microbial first-order reaction kinetics equation is used to simulate the process of phenol degradation to verify the accuracy of the model.The calculated results are compared with experimental data from the literature,and the rela-tive errors between the simulated values and experimental data under different operating conditions are shown to be 8.81％and 6.86％,respectively,which demonstrates the good reliability.
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