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|Title: ||Detecting regime transitions in gas-solid fluidized beds from low frequency accelerometry signals|
|Author(s): ||Martín, Lilian de|
Aragón, José M.
|Issued date: ||15-Feb-2011|
|Citation: ||Powder Technology, 2011, vol. 207, nº 1-3, p. 104-112|
|Abstract: ||Low frequency accelerometry signals have been applied for detecting regime transitions in a gas solid fluidized bed. Three solids have been fluidized to promote bubbling, churn and slugging regime. The Kolmogorov entropy and the power spectral density have been used to determine the regime transitions as well as to analyze the dynamical features characterizing the different regimes. Pressure and external acceleration measurements have been taken simultaneously. The accelerometry signal was sampled at 10 kHz; then, the envelope was extracted and resampled at 400 Hz. Pressure signal was sampled at 10 kHz and resampled at 400 Hz. Two problems were found during the work: the colored noise present in the envelope and the lack of low frequency information for one of the tested solids. FIR, wavelet and EMD filter strategies have been applied to remove the noise present in the envelope. It is concluded that the envelope of the accelerometry signal might be used to detect regime transition in the same way as the pressure fluctuation signals. Both Kolmogorov and spectral analysis exhibit common features to those obtained from pressure signal analysis, supporting the hypothesis of using low frequency accelerometry instead of conventional pressure measurements for monitoring fluidized beds|
|Sponsor: ||The authors would like to especially thank Prof. María C. Palancar for her contribution to this work and the useful guiding during those years. Moreover, the financial support from the Spanish Ministry of Research, project CTQ2006 15525 C02 01 is kindly acknowledged|
|Publisher version: ||http://dx.doi.org/10.1016/j.powtec.2010.10.015|
|Appears in Collections:||DITF - ISE - Artículos de Revistas Científicas|
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