三相多室环流反应器的流动特性

Hydrodynamic Characteristics in Three-Phase MALR

在空气-水-石英砂三相多室气升式环流反应器(MALR)中,依据能量平衡原理及漂流通量模型,考虑到三相流动中固体颗粒相互作用产生的能量损失,建立了上升室气含率和循环液速的预测模型。在表观气速1.2～4.2cm/s范围内,研究了气含率、固含率、循环液速随操作条件的变化规律。结果表明,气含率随着表观气速的升高先增大后趋于平缓;固含率与表观气速的关系不大,只是随着固体装载量的增加而增大;循环液速随着表观气速的升高先增大而后略有下降,随着固体装载量的增加而减小。最后用实验结果对所建立的模型进行了验证。

The models of gas holdup in riser and liquid circulation velocity were established on the basis of energy balance principle and drift-flux model for a three-phase system of air-water-quartz particles in multi-compartment airlift loop reactor（MALR）,taking the energy dissipation due to the interaction between the solid particles into account.The effects of airflow rate,solid loading on hydrodynamic characteristics—gas holdup,solid holdup,liquid circulation velocity were investigated in a range of superfacial gas velocity 1.2-4.2 cm/s.The results showed that the gas holdup in riser increased with the increase of superfacial gas velocity and then tended to be constant,and the solid holdup was independent on the superfacial gas velocity and only increased with the increase of the solid loading.The liquid circulation velocity increased and then somewhat decreased with the increase of superfacial gas velocity,while decreased as the solid loading increased.A good agreement between calculated and experimental data was obtained.