Study on Gas Short-cut through Dynamic Seal of Rotating Packed Bed

摘要

By rotating a rigid rotor in the stationary casing, rotating packed beds adopt highercentrifugal acceleration in mass and heat transfer operations to achieve process intensification.The inside dynamic seal between the rotating rotor and the stationary casing usually usespacking or centrifugal liquid ring dynamic seal to ensure gas passage through the rotor. Thegas in the casing may bypass the rotor and make a short-cut through the inside dynamic sealso that the purity of the gas product is reduced, if the dynamic seal system is not perfect. Amodel of gas short-cut through inside seal was established to predict the effect of short-cut gason gas concentration at the inner periphery of the rotor. Both the theoretical plate number oftotal-reflux distillation with ideal system and the total number of gas transfer unit of lowconcentration gas absorption decrease with the increases in the ratio of short-cut gas rate tototal gas rate, which indicates that the reliability of dynamic seal has a direct impact onmass-transfer in rotating packed bed.