新型复合转子超重力旋转床性能的研究

发布时间：2018-08-13 13:33

【摘要】：超重力旋转床,是一种新型高效的过程强化装置,它能产生数百至一千倍重力加速度的超重力环境,极大的提高了气液比表面积和气液间的传质。成功的应用于工业吸收、萃取、精馏等分离过程当中。超重力旋转床的核心的部件是转子,本文设计了一种新型复合转子,其特征在于,复合转子分为内侧部分和外侧两部分,内侧部分是随动盘转动的多层多孔波纹碟片与静止的静盘结合,每2层波纹碟片之间相互嵌套,构成“S”型气液流通通道。复合转子外侧部分为折流式旋转床转子。用NaOH水溶液化学吸收CO2与空气的混合气体来测定新型复合转子旋转床的气液比表面积ae和液相分传质系数kL,并用空气吹脱乙醇水溶液的方法来测定新型复合转子旋转床的气相分传质系数kG,还以空气-水为体系测量了新型复合转子旋转床的气相压降。考查了气量、液量和转速对新型复合转子旋转床性能的影响,并将实验数据与折流式旋转床实验数据相进行对比。实验结果表明:(1)新型复合转子旋转床的气液比表面积ae、液相分传质系数kL和气相分传质系数kG随气量、液量和转速的增大而增大。ae、kL和kG分别达到292m2/m3~880.5m2/m3、0.0014m/s~0.00264m/s和0.016m/s~0.062m/s。(2)在相同的设备参数和操作条件下,新型复合转子旋转床与折流式旋转床相比较,气液比表面积ae大0.47~2.46倍、液相分传质系数kL小11%~37%和气相分传质系数kG小7%~22%。(3)在相同的设备参数和操作条件下,新型复合转子旋转床与其它旋转床(RPB)相比,新型复合转子旋转床的气液比表面积ae大于分段进液式RPB、多个叶片转子RPB和板式填料RPB,小于常规不锈钢金属网RPB、镍泡沫填料RPB。新型复合转子的液相分传质系数kL高于其它旋转床。小液量时,复合转子旋转床的气相分传质系数kG与其它旋转床很接近。(4)新型复合转子旋转床的干床压降和湿床压降随气量增大而增大,干床压降随转速增大缓慢增大。湿床压降随转速和液量的增加而增大。与折流式旋转床相比,干床压降小30%~42%。湿床气相压降小52%~70%。
[Abstract]:High gravity rotating bed is a new type of high efficiency process strengthening device. It can produce hundreds to one thousand times of gravity acceleration in the high gravity environment and greatly improve the gas-liquid specific surface area and mass transfer between gas and liquid. Successful application in industrial absorption, extraction, distillation and other separation processes. The core component of the high gravity rotating bed is the rotor. In this paper, a new type of composite rotor is designed, which is characterized by the fact that the composite rotor is divided into two parts: the inner part and the outer part. In the inner part, the multi-layer porous corrugated disc rotates with the stationary disc, and each of the two layers of corrugated disc is nested with each other to form a "S" type gas-liquid flow channel. The outer part of the composite rotor is a rotor with a baffled rotating bed. The gas-liquid specific surface area (ae) and liquid mass transfer coefficient (KL) of a new compound rotor rotating bed were determined by chemical absorption of CO2 and air mixture gas by NaOH aqueous solution, and the new composite rotor was determined by air blowing off ethanol aqueous solution. The gas phase mass transfer coefficient (KG) of the rotating bed is also measured by using the air-water system to measure the gas phase pressure drop of the new composite rotor rotating bed. The effects of gas volume, liquid volume and rotating speed on the performance of the new compound rotor rotating bed were investigated, and the experimental data were compared with the experimental data of the baffled rotating bed. The experimental results show that: (1) the gas-liquid specific surface area, liquid mass transfer coefficient KL and gas phase mass transfer coefficient KG of the new composite rotor rotating bed depend on the volume of gas. With the increase of liquid volume and rotational speed, the ratio of gas to liquid is increased to 292m2m2m3880.5m2rm3kL and 0.0014m / s 0.00264m / s and 0.016m / s / s 0.062m / s respectively. (2) under the same equipment parameters and operating conditions, the gas-liquid specific surface area of the new rotating bed is 0.47% 2.46 times larger than that of the zigzag rotating bed. The liquid phase mass transfer coefficient KL is 11 / 37% and the gas phase mass transfer coefficient KG is 7 / 22. (3) under the same equipment parameters and operating conditions, the new composite rotor rotating bed is compared with other rotating bed (RPB). The gas-liquid specific surface area of the new composite rotor rotating bed is larger than that of the segmented liquid injection type RPB. the RPB of multiple blade rotors and the plate packing RPBare smaller than those of conventional stainless steel metal mesh and nickel foam filler RPB. The liquid phase mass transfer coefficient KL of the new composite rotor is higher than that of other rotating beds. The gas mass transfer coefficient KG of the rotating bed is very close to that of other rotating beds. (4) the dry bed pressure drop and the wet bed pressure drop increase with the increase of air volume, and the dry bed pressure drop increases slowly with the increase of rotating speed. The wet bed pressure drop increases with the increase of rotational speed and liquid content. The dry bed pressure drop is 30 / 42 lower than the baffled rotating bed. The wet bed vapor pressure drop is 52%.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ051.1

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