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Received April 29, 2011
Accepted August 17, 2011
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Conditional monitoring of moisture content in a fluidized bed dryer by the acoustic emission signature
Multiphase Systems Research Lab, School of Chemical Engineering, College of Engineering, University of Tehran, P. O. Box 11155/4563, Tehran, Iran
sotudeh@ut.ac.ir
Korean Journal of Chemical Engineering, May 2012, 29(5), 595-600(6), 10.1007/s11814-011-0216-0
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Abstract
Wetted rice particles were dried in a fluidized bed and the corresponding passive acoustic emissions signals (AES) were recorded at a given frequency to study the drying phenomena and bed hydrodynamic changes as well. The results show that the end time of the constant rate zone and the end of the falling rate can be determined from the variation of standard deviation and kurtosis of AES, respectively. Frequency domain analysis was also used to quantify the moisture content of solids. For this end, the original signal was decomposed into ten sub-signals, and it was found that the energy of the 4th sub-signal can be correlated with the moisture content. The results show that the acoustic emission measurement is applicable as a practical method for on-line condition monitoring of drying process in fluidized bed dryers.
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Tsujimoto H, Yokoyama T, Huang CC, Sekiguchi I, Powder Technol., 113, 88 (1999)
Briongos JV, Aragon JM, Palancar MC, Powder Technol., 162(2), 145 (2006)
Salehi-Nik N, Sotudeh-Gharebagh R, Mostoufi N, Zarghami R, Mahjoob MJ, Int. J. Multiphase Flow., 35, 1011 (2009)
Abbasi M, Sotudeh-Gharebagh R, Mostoufi N, Mahjoob MJ, Powder Technol., 196(3), 278 (2009)
Abbasi A, Sotudeh-Gharebagh R, Mostoufi N, Zarghami R, Mahjoob MJ, AIChE J., 56(3), 597 (2010)
Azizpour H, Sotudeh-Gharebagh R, Zarghami R, Abbasi M, Mostoufi N, Mahjoob MJ, Int. J. Multiphase Flow., 37, 788 (2011)
Mudde RF, Bruneau PRP, van der Hagen THJJ, Ind. Eng. Chem. Res., 44(16), 6181 (2005)
Chen A, Bi HT, Grace JR, Powder Technol., 177(3), 113 (2007)
Demirbas B, Nijenhuis J, Yurteri CU, van Ommen JR, Can. J. Chem. Eng., 86(3), 493 (2008)
Boyd JWR, Varley J, Chem. Eng. Sci., 56(5), 1749 (2001)
Friesen TL, Bruswitz GH, Lowery RL, J. Agr. Eng. Res., 39, 49 (1988)
Vervloet D, Nijenhuis J, van Ommen JR, Powder Technol., 197, 36 (2009)
Zarghami R, Mostoufi N, Sotudeh-Gharebagh R, Chaouki J, Cheng L, Mewes D,Nonlinear dynamic characteristic of bubbling fluidization, Advances in Multiphase Flow and Heat Transfer. Bentham Science Publishers Ltd., 3, 400 (2010)
Van der Schaaf J, Schouten JC, Johnsson F, van den Bleek CM, Int. J. Multiphase Flow., 28, 865 (2002)
Wormsbecker M, Pugsley T, Tanfara H, Chem. Eng. Sci., 64(8), 1739 (2009)
Johnsson F, Zijerveld RC, Schouten JC, van den Bleek CM, Leckner B, Int. J. Multiph. Flow, 26(4), 663 (2000)
Mallat S, IEEE T. Pattern Anal., 11, 674 (1989)
Chaplin G, Pugsley T, Winters C, Powder Technol., 142(2-3), 110 (2004)
Oppenheim AV, Willsky AS, Nawab SH,, Signal and Systems, Prentice-Hall (1997)
Choi KB, Park SI, Park YS, Sung SW, Lee DH, Korean J. Chem. Eng., 19(6), 1106 (2002)
Karimi K, Sotudeh-Gharebagh R, Zarghami R, Mostoufi N, Dry. Technol., 29, 1697 (2011)
Zarghami R, Conditional monitoring of fluidization quality in fluidized beds, Ph.D. Dissertation, University of Tehran, Tehran, Iran (2009)
