Wavelet analysis of pressure fluctuation signals in a gas-solid fluidized bed |
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Authors: | Zhen Ling Wang Xiao-ping Huang Hai Chen Bo-chuan Huang Chun-yan |
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Institution: | (1) Instrument Department, Zhejiang University, 310027 Hangzhou, China;(2) Chemical Engineering Department, Zhejiang University, 310027 Hangzhou, China |
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Abstract: | It has been shown that much dynamic information is hidden in the pressure fluctuation signals of a gas-solid fluidized bed.
Unfortunately, due to the random and capricious nature of this signal, it is hard to realize reliable analysis using traditional
signal processing methods such as statistical analysis or spectral analysis, which is done in Fourier domain. Information
in different frequency band can be extracted by using wavelet analysis. On the evidence of the composition of the pressure
fluctuation signals, energy of low frequency (ELF) is proposed to show the transition of fluidized regimes from bubbling fluidization
to turbulent fluidization. Plots are presented to describe the fluidized bed's evolution to help identify the state of different
flow regimes and provide a characteristic curve to identify the fluidized status effectively and reliably.
Project (No. 60075003) supported by the National Natural Science Foundation of China. |
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Keywords: | wavelet analysis pressure fluctuation multi-resolution analysis fluidized bed ELF |
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