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Technical Brief

Coupling Vibration Investigation of Cyclone Separator Interacted With Unsteady Fluid

[+] Author and Article Information
Qiang Li

College of Chemical Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: liqiangsydx@163.com

Weiwei Xu

College of Transport & Storage and Civil Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: xuweiwei@upc.edu.cn

Jianjun Wang

College of Chemical Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: wangjj01@upc.edu.cn

Ying Guo

College of Mechanical and Electrical Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: guoying1976@upc.edu.cn

Youhai Jin

College of Chemical Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: jinyh@upc.edu.cn

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 3, 2015; final manuscript received June 7, 2015; published online September 7, 2015. Assoc. Editor: Jong Chull Jo.

J. Pressure Vessel Technol 138(1), 014501 (Sep 07, 2015) (6 pages) Paper No: PVT-15-1023; doi: 10.1115/1.4030865 History: Received February 03, 2015

Gas–cyclone body coupling vibration is one kind of vibration caused by air pulsation. This coupling vibration causes widespread damage and deformation of three-stage cyclone separator used in residue fluid catalytic cracking. After theoretically analyzing the mechanism of the generation of the gas–cyclone body coupling vibration, the numerical simulation of three-dimensional swirling flow the cyclone separator was performed by using Reynolds stress model (RSM). The results showed the existence of precessing vortex core (PVC) in the cyclone separator. The PVC phenomenon and motion of PVC were described in detail. Furthermore, the amplitude and frequency of gas fluctuation in the PVC region at different axial positions were quantitatively analyzed. The simulation results agreed with the experimental results of laser Doppler velocimetry (LDV). Finally, characteristics of PVC in cyclone separator with a novel vortex finder were designed, and the results showed that the novel vortex finder can reduce flow vibration.

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Figures

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Fig. 1

General structure of three-stage cyclone separator (a) and the boundary conditions of single separator (b)

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Fig. 2

Geometry dimensions of the cyclone separator

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Fig. 10

Spectrogram at z = 6500 mm

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Fig. 3

The pressure distribution of a given axial profile at different times: (a) t = 3.0 s, (b) t = 3.18 s, (c) t = 4.348 s, and (d) t = 4.536 s

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Fig. 4

The pressure distribution of a given cross profile at different times: (a) t = 3.0 s, (b) t = 3.18 s, (c) t = 4.348 s, and (d) t = 4.536 s

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Fig. 5

Vortex core center's trajectory at different axial positions: (a) z = 6000 mm and (b) z = 6500 mm

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Fig. 6

(a) Pressure fluctuation and (b) spectrogram at z = 3000 mm

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Fig. 7

(a) Pressure fluctuation and (b) spectrogram at z = 6500 mm

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