Investigation On Performance Of Hydrodynamics Of Double Move Baffle Rotating Plate Bed

Rotating packed bed is a new type of gas-liquid mass transfer equipment which uses centrifugal force generated by the rotation to drive the flow of liquid fluid for contact and mass-transfer with the gas-liquid driving by pressure difference. Rotating packed bed has the advantages of high efficiency in mass transfer, stability in operation, simple structure, high performance in anti-flooding and adapt for a variety of workplaces.These make it have a bright application future.First of all, this paper designs a rotating plate bed with double move baffle on the basis of zigzag rotating bed patent and the experiences of school of Chemical Machinery. The key part of the equipment is a tray, which consists of stationary and rotating plate installed with baffle. The innovation lies in changing the traditional Zigzag Rotating Bed movement baffle "one to one" set into the "two to one" setting. Double lap movement baffles corresponding to one static lap baffle which enhanced the driving action to the liquid phase fluid, and is easy to decrease the low mass transfer areas behind the static lap baffle, increase the space utilization of the device. This equipment not only has the general advantages of the traditional Zigzag Rotating Bed, but also has its own unique advantages.Secondly, after the mechanical equipment accomplished, we have established the experimental platform to study the hydrodynamic performance of the device base on the experiment of two-phase flow, and experimental results show that:(1) For a particular structure style HGRB, gas pressure drop in dry bed and wet bed increase with an increasing rotating speed, gas flow rate and difference between move and static baffles. Gas pressure drop in dry bed of the HGRB with64mm dynamic tray is less than the RPB with54mm dynamic tray. On the basis of experimental data, empirical correlation using nonlinear regression HGRB of wet and dry bed pressure drop;(2) When the rotating speed of HGRB is lower, gas pressure drop in wet bed is greater than its gas pressure drop in dry bed, but the rotating speed of HGRB is higher enough, gas pressure drop in wet bed is lower than its gas pressure drop in dry bed.(3) The HGRB anti flooding performance decrease with an increasing gas flow rate, fluid flow rate and rotating speed of dynamic tray. The HGRB anti flooding performance with64mm dynamic tray is better than RPB with54mm dynamic tray. Finally, the numerical model of the HGRB is established to stimulate the flow state of the gas and liquid. The preliminary simulation results show that:(1) The gas pressure drop in dry bed with the reverse-inlet is higher because the inflow of gas-phase fluid refluxed when it was captured by HGRB dynamic plate. Gas has vortex loss.(2) Gas phase fluid flows in the interior of the HGRB, if the direction of rotor tangential linear velocity is opposite to the direction of the gas fluid inlet velocity; the gas phase fluid got the same value with the tangential velocity after it flows into the action areas of dynamic plate, the inlet gas velocity has no respect on tangential velocity.(3) Maximum of gas fluid axial velocity in the HGRB appears at the center of the dynamic tray.