Experimental and numerical analysis of a demister with vortex generators

doi:10.1016/j.cjche.2020.07.045

Chinese Journal of Chemical Engineering ›› 2021, Vol. 33 ›› Issue (5): 83-95.DOI: 10.1016/j.cjche.2020.07.045

• Separation Science and Engineering • Previous Articles Next Articles

Experimental and numerical analysis of a demister with vortex generators

Laishun Yang^1,2, Minghai Xu², Jianjun Wang², Lei Song³, Jianxing Wang³

1 College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China;
2 College of New Energy, China University of Petroleum (East China), Qingdao 266580, China;
3 Key Laboratory of Space Utilization, Technology and Engineering Center for space Utilization, Chinese Academy of Sciences, Beijing 100094, China

Received:2020-03-10 Revised:2020-07-17 Online:2021-08-19 Published:2021-05-28
Contact: Minghai Xu
Supported by:
This work was supported by the Foundation of key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences (CSU-QZKT-2018-09) and Open Project of Beijing Key Laboratory of Measurement and Control of Mechanical and Electrical System under Grant No. KF20181123205.

Experimental and numerical analysis of a demister with vortex generators

Laishun Yang^1,2, Minghai Xu², Jianjun Wang², Lei Song³, Jianxing Wang³

1 College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China;
2 College of New Energy, China University of Petroleum (East China), Qingdao 266580, China;
3 Key Laboratory of Space Utilization, Technology and Engineering Center for space Utilization, Chinese Academy of Sciences, Beijing 100094, China

通讯作者: Minghai Xu
基金资助:
This work was supported by the Foundation of key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences (CSU-QZKT-2018-09) and Open Project of Beijing Key Laboratory of Measurement and Control of Mechanical and Electrical System under Grant No. KF20181123205.

Abstract

Abstract: An improved wave-plate demister equipped with vortex generators (VGs) has been proposed for wet flue gas desulfurization 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 triangular tubes, respectively. In order to explain the strengthening mechanism, the distribution of flow field, secondary 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 23.13 μm, whereas this value for the initial demister can be maintained at 32.07 μm. Moreover, compared with the original demister 0.81, the overall separation efficiency of the improved demister was improved to 0.92.

Key words: Demister, Vortex generator, Separation, Numerical simulation, Experimental validation

摘要： An improved wave-plate demister equipped with vortex generators (VGs) has been proposed for wet flue gas desulfurization 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 triangular tubes, respectively. In order to explain the strengthening mechanism, the distribution of flow field, secondary 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 23.13 μm, whereas this value for the initial demister can be maintained at 32.07 μm. Moreover, compared with the original demister 0.81, the overall separation efficiency of the improved demister was improved to 0.92.

关键词: Demister, Vortex generator, Separation, Numerical simulation, Experimental validation

Laishun Yang, Minghai Xu, Jianjun Wang, Lei Song, Jianxing Wang. Experimental and numerical analysis of a demister with vortex generators[J]. Chinese Journal of Chemical Engineering, 2021, 33(5): 83-95.

Laishun Yang, Minghai Xu, Jianjun Wang, Lei Song, Jianxing Wang. Experimental and numerical analysis of a demister with vortex generators[J]. 中国化学工程学报, 2021, 33(5): 83-95.

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Experimental and numerical analysis of a demister with vortex generators

Experimental and numerical analysis of a demister with vortex generators

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