Experimental and numerical analysis of a demister with vortex generators

• 作者: Laishun Yang Minghai Xu Jianjun Wang Lei Song Jianxing Wang
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Separation Science and Engineering
• 页码范围: 83-95
• 页数: 13页
• 语种: 英文

摘要

An improved wave-plate demister equipped with vortex generators (VGs) has been proposed for wet flue gas de-sulfurization systems (WFGD) in this work. Numerical and experimental methods were used to evaluate the effect of VGs on the separation of small droplets. Five types of wave-plate demister with different VGs were analyzed. The vortex generators in question included rectangular plates, semi-elliptical plates, square tubes, round tubes, and tri-angular tubes, respectively. In order to explain the strengthening mechanism, the distribution of flow field, second-ary flow, and droplet trajectory were shown, and the effect of VGs on the flow field in the demister was discussed in depth. The simulation results show that the separation performances of the demisters with VGs were significantly improved over that of the initial demister, and the accompanying pressure drop was small. For the vortex generators studied, the rectangular plate fully demonstrated its superior separation performance, followed by semi-elliptical plate. The strengthening effect of VGs was tested through experiments. Experimental data reveal that the average droplet diameter (D50) at the outlet of the demister with a vortex generator can be reduced to 23.13μm, whereas this value for the initial demister can be maintained at 32.07μm. Moreover, compared with the original demister 0.81, the overall separation efficiency of the improved demister was improved to 0.92.