Time-series analysis of the characteristic pressure fluctuations in a conical fluidized bed with negative pressure

Sheng Fang; Yanding Wei; Lei Fu; Geng Tian; Haibin Qu

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Time-series analysis of the characteristic pressure fluctuations in a conical fluidized bed with negative pressure

Fluid Dynamics and Transport Phenomena | Updated：2026-01-06

- Time-series analysis of the characteristic pressure fluctuations in a conical fluidized bed with negative pressure
- Chinese Journal of Chemical Engineering Vol. 32, Issue 4, Pages: 87-99(2021)
- Affiliations：
  
  1. The State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University,Hangzhou,China,310027
  2. Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, College of Mechanical Engineering, Zhejiang University,Hangzhou,China,310027
  3. College of Mechanical Engineering, Zhejiang University of Technology,Hangzhou,China,310023
  4. Pharmaceutical Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University,Hangzhou,China,310058
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2021
- Accepted：
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Sheng Fang, Yanding Wei, Lei Fu, Geng Tian, Haibin Qu. Time-series analysis of the characteristic pressure fluctuations in a conical fluidized bed with negative pressure[J]. Chinese Journal of Chemical Engineering, 2021, 32(4): 87-99.
DOI：

Sheng Fang, Yanding Wei, Lei Fu, Geng Tian, Haibin Qu. Time-series analysis of the characteristic pressure fluctuations in a conical fluidized bed with negative pressure[J]. Chinese Journal of Chemical Engineering, 2021, 32(4): 87-99. DOI：

摘要

Abstract

The negative pressure conical fluidized bed is widely used in the pharmaceutical industry. In this study

experiments based on the negative pressure conical fluidized bed are carried out by changing the material mass and particle size. The pressure fluctuation signals are analyzed by the time and the frequency domain methods. A method for absolutely characterizing the degree of the energy concentration at the main frequency is proposed

where the calculation is to divide the original power spectrum by the average signal power. A phenomenon where the gas velocity curve temporarily stops growing is observed when the material mass is light

and the particle size is small. The standard deviation and kurtosis both rapidly change at the minimum fluidization velocity and thus can be used to determine the flow regime

and the variation rule of the kurtosis is independent of both the material mass and particle size. In the initial fluidization stage

the dominant pressure signal comes from the material movement; with the increase in the gas velocity

the power of a 2.5 Hz signal continues to increase. A method of dividing the main frequency by the average cycle frequency can conveniently determine the fluidized state

and a novel concept called stable fluidized zone proposed in this paper can be obtained. Controlling the gas velocity within the stable fluidized zone ensures that the fluidized bed consistently remains in a stable fluidized state.

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