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Wavelet Characterization of the Flow Regime in a Gas-Solid Fluidized Bed

Journal of Energy and Power Engineering 2013年第6期7卷 1023-1031页

作者： Maria Luiza Sperb Indrusiak Yesid Javier Rueda-Ordonez Arai Augusta Bernardez Pecora Mechanical Engineering Department Polytechnic School University of Vale do Rio dos Sino-UNISINOS Porto Alegre93022-000 Brazil Department of Thermal and Fluids Engineering School of Mechanical Engineering University of Campinas-UNICAMPCampinas 13083-860 Brazil

Processes like combustion, pyrolysis or gasification of coal and biomass are typical applications of gas-solid fluidized beds. These reactors normally use silica sand as the inert material inside the bed and the sand particles represent around 95% of the total bed weight. Pressure measurements have been used to characterize the dynamic behavior of fluidized beds since early researches in the area. Pressure fluctuations are generally due to bubbles flow which characterizes the fluidization regime. The present work aims to perform a time-frequency analysis of the pressure signal acquired in an experimental apparatus on different gas-solid flow regimes. Continuous and discrete wavelet transforms were applied and the results were compared with image records acquired simultaneously with the pressure signal. The main frequencies observed are in accordance with the ones obtained through Fourier spectra. The time-frequency distribution of the signal agrees with the phenomena observed in the image record, remarkably for the slugging flow. Some additional research is still necessary to completely characterize the flow regimes using the wavelet scalograms but the present results show that the task is a very promising one.

关键词：离散小波变换气固流化床流态化表征压力信号典型应用频率分布气固两相流

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