关键词: 径向叶片式旋转床, 压降, 模型, 气相流场, 计算流体力学, 模拟

Abstract: A new kind of high-gravity device-the rotating bed with radial blades-has been developed to reduce the pressure drop and power consumption of rotating zigzag bed. Firstly, the pressure drop of rotating bed with radial blades was theoretically analyzed, and the model of pressure drop was established. Then experimental study was conducted using water-air system. The effects of several factors on pressure drop of the rotating bed were studied by changing the gas flow rate, rotational speed and liquid flow rate. It showed that the pressure drop increased respectively with the increase of gas flow rate, rotational speed and liquid flow rate. The contribution of liquid flow to pressure drop gradually decreases with the increase of gas flow rate and rotating speed. Compared with the experimental results, the predicted values of the proposed model relatively deviate by less than 10%, which indicates that the model can properly predict pressure drop. Computational fluid dynamics (CFD) simulation produced the gas flow field and pressure distribution of the rotating bed, and it was found that the pressure drop inside the rotor is the main part of the total pressure drop. When the gas enters the rotor, it was subjected to blades motion thus increasing the circumferential velocity, which reaches the maximum at the outer edge of the rotor. Additionally, the gas phase distribution would be affected by the inlet gas velocity in the rotating bed. The relative deviation between the CFD simulation result and the experimental data was about 10%.

Key words: rotating bed with radial blade, pressure drop, model, gas flow field, CFD, simulation