The numerical simulation of a new double swirl static mixer for gas reactants mixing

doi:10.1016/j.cjche.2020.05.008

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (9): 2438-2446.DOI: 10.1016/j.cjche.2020.05.008

• Energy, Resources and Environmental Technology • 上一篇下一篇

The numerical simulation of a new double swirl static mixer for gas reactants mixing

Zhuokai Zhuang^1,2, Jingtian Yan³, Chenglang Sun^1,2, Haiqiang Wang^1,2, Yuejun Wang^2,4, Zhongbiao Wu^1,2

1 Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resources Science, Zhejiang University, Hangzhou 310058, China;
2 Zhejiang Provincial Engineering Research Centre of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, China;
3 College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China;
4 Zhejiang Tianlan Environmental Protection Technology Co. Ltd, Hangzhou 311202, China

收稿日期:2019-07-02 修回日期:2020-05-09 出版日期:2020-09-28 发布日期:2020-10-21
通讯作者: Haiqiang Wang, Yuejun Wang
基金资助:
This research was financially supported by National Key Research and Development Plan of China (2016YFC0204700), Key Project of Zhejiang Provincial Science and Technology Program, Zhejiang Provincial "151" Talents Program, and Program for Zhejiang Leading Team of S&T Innovation (Grant No. 2013TD07).

The numerical simulation of a new double swirl static mixer for gas reactants mixing

Zhuokai Zhuang^1,2, Jingtian Yan³, Chenglang Sun^1,2, Haiqiang Wang^1,2, Yuejun Wang^2,4, Zhongbiao Wu^1,2

1 Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resources Science, Zhejiang University, Hangzhou 310058, China;
2 Zhejiang Provincial Engineering Research Centre of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, China;
3 College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China;
4 Zhejiang Tianlan Environmental Protection Technology Co. Ltd, Hangzhou 311202, China

Received:2019-07-02 Revised:2020-05-09 Online:2020-09-28 Published:2020-10-21
Contact: Haiqiang Wang, Yuejun Wang
Supported by:
This research was financially supported by National Key Research and Development Plan of China (2016YFC0204700), Key Project of Zhejiang Provincial Science and Technology Program, Zhejiang Provincial "151" Talents Program, and Program for Zhejiang Leading Team of S&T Innovation (Grant No. 2013TD07).

摘要/Abstract

摘要： For the nitrogen oxide removal processes, high performance gas mixer is deeply needed for the injection of NH₃ or O₃. In this study, a new type of double swirl static mixer in gas mixing was investigated using computational fluid dynamics (CFD). The results obtained using Particle Image Velocimetry (PIV) correlated well with the results obtained from simulation. The comparisons in pressure loss between the experimental results and the simulation results showed that the model was suitable and accurate for the simulation of the static mixer. Optimal process conditions and design were investigated. When L/D equaled 4, coefficient of variation (COV) was <5%. The inlet velocity did not affect the distributions of turbulent kinetic energy. In terms of both COV and pressure loss, the inner connector is important in the design of the static mixer. The nozzle length should be set at 4 cm. Taking both COV and pressure loss into consideration, the optimal oblique degree is 45°. The averaged kinetic energy changed according to process conditions and design. The new static mixer resulted in improved mixing performance in a more compact design. The new static mixer is more energy efficient compared with other SV static mixers. Therefore, the double swirl static mixer is promising in gas mixing.

关键词: CFD, PIV, Gas mixing, Double swirl static mixer, Pressure loss

Abstract: For the nitrogen oxide removal processes, high performance gas mixer is deeply needed for the injection of NH₃ or O₃. In this study, a new type of double swirl static mixer in gas mixing was investigated using computational fluid dynamics (CFD). The results obtained using Particle Image Velocimetry (PIV) correlated well with the results obtained from simulation. The comparisons in pressure loss between the experimental results and the simulation results showed that the model was suitable and accurate for the simulation of the static mixer. Optimal process conditions and design were investigated. When L/D equaled 4, coefficient of variation (COV) was <5%. The inlet velocity did not affect the distributions of turbulent kinetic energy. In terms of both COV and pressure loss, the inner connector is important in the design of the static mixer. The nozzle length should be set at 4 cm. Taking both COV and pressure loss into consideration, the optimal oblique degree is 45°. The averaged kinetic energy changed according to process conditions and design. The new static mixer resulted in improved mixing performance in a more compact design. The new static mixer is more energy efficient compared with other SV static mixers. Therefore, the double swirl static mixer is promising in gas mixing.

Key words: CFD, PIV, Gas mixing, Double swirl static mixer, Pressure loss

Zhuokai Zhuang, Jingtian Yan, Chenglang Sun, Haiqiang Wang, Yuejun Wang, Zhongbiao Wu. The numerical simulation of a new double swirl static mixer for gas reactants mixing[J]. 中国化学工程学报, 2020, 28(9): 2438-2446.

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The numerical simulation of a new double swirl static mixer for gas reactants mixing

The numerical simulation of a new double swirl static mixer for gas reactants mixing

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