Research On Performance Of Hydrodynamics Of Rotating Plate Bed

Hydrodynamics of rotating plate bed, including gas pressure drop and flooding, have been investigated experimentally and numerically in this paper, which is for the purpose of a better understanding of hydrodynamics in a rotating bed and then searching for some reasonable grounds of rotor structures’optimization. The correlations for gas pressure drop and flooding have been obtained in this study, which offers some basis for predicting the equipment capacity and the structural optimization design for rotors. From experimental and simulation results, the following conclusions can be drawn.(1) Experimental results about gas pressure drop①Gas pressure drop in dry bed has a significant proportionate increment with an increasing gas flow rate, while a little increment with rotating speed increasing.②Gas pressure drop in dry bed decreases promptly firstly and then changes slowly when plate spacing h gets higher. The optimal plate spacing hopt increases with an increasing gas flow rate. The value of gas pressure drop in the rotor HJ45-D45is larger than the rotor HJ45-D50, while the rotor HJ45-D50’is smallest. Results showed that gas pressure drop in dry bed and in irrigated bed are of the same characters.On the basis of experiments, the correlative formulas for pressure drop with correlation coefficients of0.987351374and0.995351304respectively in dry bed and in irrigated bed were deduced by orthogonal and nonlinear regression methods in this study. The results of experiment and correlative formulas showed that there remained a relative error of9.296%and4.205%respectively on gas pressure drop in dry bed and in wet bed. It was founded that the correlative results were in good agreement with the experimental data.(2) Simulation results about gas pressure drop①Gas pressure drop has a great increment firstly and a slightly increase later with an increasing plate spacing h. And the optimal plate spacing hopt increases when gas flow rate gets higher.②Gas pressure drop has a significantly decrease firstly and then changes slowly with an increasing plate height He. And the optimal plate height Hopt increases when gas flow rate gets higher or plate spacing h gets smaller. ③Gas pressure drop differs from rotor structures. A new type of rotor with plates of different height has a smaller value compared with those of the same plate height and which usually has a larger height of the immobile baffle than the rotating one.(3) Experimental results about flooding①Flooding point in rotating plate bed decreases when liquid flow rate or rotating speed gets higher, if the plate spacing h remains constant.②Flooding point increases with an increasing plate spacing h, if liquid flow rate and rotating speed remains constant.③The hydrodynamic of Flooding varies with the rotor structure. Flooding point of the rotor HJ50-D50is higher than HJ45-D45, and lower than HJ45-D50.According to Wallis’flooding correlation, flooding point relations applied in different plate spacing and different rotor structure have been established in this paper. The calculating results were satisfactory compared with the experimental ones, which showed that Wallis’ flooding correlation is applicable in rotating plate bed. What’ s more, it is portable for researchers to estimate the equipment capacity, and also provides a foundation for design of rotating plate bed.