关键词: 同心圈式旋转床, 多孔板, 等板高度, 气相压降

Abstract:

A concentric-ring rotating bed, as a novel higee device, has a rotor consisting of several concentric rings made by perforated plates with and without packing between adjacent concentric rings. A liquid slip effect exists on the concentric rings, which, enhances the gas-liquid effective interfacial area and improves the liquid circumferential distribution. With ethanol-water system, total reflux distillation experiments were conducted in a concentric-ring rotating bed with a rotor of an outer diameter of 1.0m at atmospheric pressure. Two rotors with and without stainless steel wire mesh between adjacent concentric rings were used, respectively. The effects of F-factor and high-gravity factor on height equivalent of theoretical plate(HETP) and gas pressure drop across the concentric-ring rotating bed were analyzed. Experimental results showed that the large concentric-ring rotating bed has a large processing capacity. With increasing F-factor and high-gravity factor, HETP decreased first and then increased. The HETP values of the rotor with wire mesh were smaller than those of the rotor without wire mesh. The HETP minimum value of 51.5mm and the gas pressure drop per number of theoretical plate of 1.5kPa was obtained at a high-gravity factor of 563.4 and a F-factor of 5.5(m/s) (kg/m³)^0.5 for the rotor with wire mesh. Correlations of HETP of rotors with and without wire mesh were proposed using experimental data. In comparison with rotating zigzag bed, the concentric-ring rotating bed has the advantages of high throughput and low pressure drop.

Key words: concentric-ring rotating bed, perforated plates, HETP, gas pressure drop