超重力旋转床填料纳微结构表面构筑及其传质强化调控机制研究

As one of the cutting-edge chemical process intensification equipment, rotating packed beds (RPBs) have been successfully applied in chemical industries. Wire mesh packing, used in RPBs, has some disadvantages of easily blocked and low mass transfer efficiency for a long time industrial running. In order to solve these problems, we need a better understanding of the interaction behavior between the packing surface and the liquid. This proposal studies the fabrication of nano-micro structured packing surface and the influence of the nano-micro structured packing surface on the fluid flow and transfer performance. It aims at revealing the mechanism of the nano-micro structured surface construction regulating macro effect of mass transfer. A mass transfer model will be built to illustrate the mass transfer intensification in the RPB, which is loaded with the nano-micro structured packing. Based on the above investigation, we are expected to develop a new technology to produce the packing with the advantages of high efficiency, energy saving, and self-cleaning ability, and also providing scientific basis for the development of a Higee molecular reactor.

作为前沿化工过程强化装备之一，超重力旋转床已成功实现了工业应用。在工业长周期运行过程中，发现常用的丝网填料尚存在堵塞、传质性能还有待进一步提高等问题，研究填料表面结构与液体之间的相互作用关系是有效解决上述问题的方法之一。本课题拟从填料材料纳微结构表面构筑出发，研究纳微结构表面对流体流动、传递的影响规律，揭示填料微观结构表面构筑调控宏观传质性能的影响机制，构建填料纳微结构表面强化超重力旋转床传质的机理模型，为高效节能、具有自清洁性纳微结构化填料的开发提供理论指导，进而为发展“超重力分子反应器”提供科学基础。

超重力旋转床具有优异的传质和微观混合特性，被广泛用于化工工业过程。本项目以不锈钢丝网和整体式泡沫镍两种典型的超重力旋转床填料为研究对象，成功开发了两种填料表面纳微结构构筑的制备方法，搭建了液体撞击纳微结构表面的可视化实验平台，揭示了液体撞击纳微结构表面的分散形态及尺寸规律。相比撞击未进行纳微结构构筑的表面，液滴直径平均减小14%。初步实现了利用表面微观结构调控和强化超重力旋转床宏观传质性能的新技术。将制备的表面纳微结构新填料成功应用于易堵塞场合的超重力脱硫等工业试验，具有良好的工业应用前景。