Numerical investigation on dynamic characteristics of flow field in cyclone separators with different dust hopper structures--颗粒学报PARTICUOLOGY

Zhu, L., Wang, S., Ru, Y., Wang, J., Yang, P., Li, A., . . . Wang, Z. (2023). Numerical investigation on dynamic characteristics of flow field in cyclone separators with different dust hopper structures. Particuology, 82, 134-145. https://doi.org/10.1016/j.partic.2023.01.016

Numerical investigation on dynamic characteristics of flow field in cyclone separators with different dust hopper structures

Liyun Zhu ^a *, Sen Wang ^a, Yi Ru ^b, Jianzhu Wang ^a, Pengju Yang ^a, Anjun Li ^a, Zhenfei Ma ^a, Zhenbo Wang ^a

a College of New Energy, State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao, 266580, China
b Hualu Engineering & Technology Co., Ltd, Xi'an, 710065, Shaanxi Province, China

10.1016/j.partic.2023.01.016

Volume 82, November 2023, Pages 134-145

Received 16 November 2022, Revised 16 January 2023, Accepted 24 January 2023, Available online 11 February 2023, Version of Record 18 February 2023.

E-mail: zlyx415@163.com

Highlights

• Precessing center of vortex was inconsistent with the geometrical center of cyclone separator.

• Characteristic frequencies of cylinder, cone, and dust hopper were calculated.

• Precession of vortex core in double vortex region was co-affected by cone section and hopper.

• Characteristic frequency of dust hopper increased with the decrease of diameter of hopper.

• Dust hopper of d = 1.5D and h = 1.5D was favorable to minimize back-mixing.

Abstract

The dynamic characteristics of flow field in cyclone separators with different dust hopper structures were studied by coupling Reynolds Stress Model (RSM) and Lagrangian Particle Tracking (LPT) methods. The characteristic frequencies of cylinder section, cone section and dust hopper were calculated as f1 = 53 Hz, f2 = 65 Hz, and f3 = 8 Hz by using Fast Fourier Transform (FFT) method, respectively. Based on the effects of f3 on the motion of vortex, the separated space was divided into none affected region, weakly affected region, and strongly affected region. The characteristic frequency of dust hopper increased with the decrease of dust hopper diameter, while it was independent of the height. The dust hopper with d = 1.5D (model D3) and h = 1.5D (model H3) can significantly decrease the effect of back-mixing on the motion of inner vortex, which is beneficial to improve the efficiency of cyclone separator.

Graphical abstract

Keywords

Cyclone separator; Dust hopper structures; Precessing vortex core; Time-frequency analysis; Numerical simulation

文章导读