Study On Performance Of Hydrodynamics Of Rotating Plate Bed

High gravity technology and the rotary bed (also called Higee or rotating bed), is a type of highly efficient gas-liquid contact equipment developed in the 1980s. It uses centrifugal force to intense the contact and mixture of the gas-liquid. Higee has the characteristics of high efficiency of mass transfer and space utilization, high flooding point, and these advantages make it have a bright application future.First of all, this paper designs a plate rotating bed on the basis of zigzag rotating bed patent and the experiences of school of Chemical Engineering. The key part of the equipment is a plate rotor, which consists of stationary and rotating disk. A number of circular plates are homocentrically installed on the immobile disk and rotational disk, which were inlayed in two types of disks together to form zigzag channels for liquid and gas flowing. Comparing with the rotating packed bed, the plate rotor has the advantages of simpler construction and easy to series, what's more, liquid in it is well-distributed and it can extend the contact time of the two-phase.Secondly, in this paper, the physical model of the plate rotor is established, using air-water and commercial CFD software-Fluent, to stimulate the flow state of the gas and liquid. The flow patterns and pressure drop have been systematically investigated in the simulation. The preliminary simulation results show that:(1) The radial distribution of the gas flow direction is primary, which indicates that the rotating speed has a little effect on the gas flow state while a lot on the liquid, thus the tangential velocity of the gas is small while of the liquid is obvious.(2)The gas pressure drop has a little increment with an increasing rotating speed, while a significant proportionate increment with an increasing square of the flow rate. The centrifugal pressure drop is minor compared with the frictional pressure drop and the local resistance pressure drop. The gas energy loss mainly takes place at the turn back position of the flow channelAnd finally, after the mechanical equipment was accomplished, we have established the experimental platform. Hydrodynamic performance such as the flow state and the distribution of water, the pressure drop, flooding point are experimental researched.Experimental observation and the pictures by quick shoot demonstrate 3 forms of water (film, thread and droplet) in the plate rotor, also show the homogeneous distribution of the water. Experimental results show that:(1) The forms of water flow in the rotor contains of 3 forms:water film on the plate, the water thread threw away from the rotating plate, and the swashing droplets(2) The gas pressure has a little increment with an increasing rotating speed, while an obvious increment with an increasing gas flow rate. In addition, it first decreases a little then increases with increasing water flow rate.(3) Flooding happens when water flow goes beyond the limit or the rotating speed is very low, on the other hand, the water droplets will be carried out by the gas flow when the gas flow rate is plenty more. Then we get the line of L-r and the flooding line.(4) The flooding velocity increases with the increasing rotating speed, but decreases with the increasing water flow rate.