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Influence of Bed Geometry on the Drying of Skimmed Milk in a Spouted Bed

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DOI: 10.4236/aces.2015.54046    3,880 Downloads   4,225 Views   Citations

ABSTRACT

In this present work, the fluidynamic and drying process of skimmed milk in conical and conical-cylindrical spouted bed was analyzed as a function of different bed geometry and operating conditions. It used three internal cone angles (45°, 60° and 75°), different loads of inert particles (1.50, 3.00 and 4.50 kg) and a fixed static bed height (20.50 cm). Polyethylene particles of 4.38 mm of diameter and 930.50 ± 0.3 kg/m3 of specific mass were used as inert particles. An artificial neural network model was trained to predict the peak pressure drop and the minimum spout velocity from an experimental data bank. The experimental results showed a significant effect of geometric characteristics of the bed on fluidynamics parameters. It was also observed for the operating conditions that conical spouted bed and cone angle of 45° were more suitable for drying skimmed milk. The neural network provided predictions in good agreement with experimental data.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Perazzini, M. , Freire, F. and Freire, J. (2015) Influence of Bed Geometry on the Drying of Skimmed Milk in a Spouted Bed. Advances in Chemical Engineering and Science, 5, 447-460. doi: 10.4236/aces.2015.54046.

References

[1] Mathur, K.B. and Epstein, N. (1974) Spouted Beds. Academic Press, New York.
[2] Olazar, M., San José, M.J., Aguayo, A.T., Arandes, J.M. and Bilbao, J. (1992) Stable Operation Conditions for Gas-Solid Contact Regimes in Conical Spouted Beds. Industrial & Engineering Chemical Research, 31, 1784-1792.
http://dx.doi.org/10.1021/ie00007a025
[3] Olazar, M., San José, M.J., Izquierdo, M.A., Alvarez, S. and Bilbao, J. (2004) Fountain Geometry in Shallow Spouted Beds. Industrial & Engineering Chemical Research, 43, 1163-1168.
http://dx.doi.org/10.1021/ie030641d
[4] San José, M.J., Olazar, M., Izquierdo M.A., Alvarez, S. and Bilbao, J. (2004) Solid Trajectories and Cycle Times in Spouted Beds. Industrial & Engineering Chemical Research, 43, 3433-3438.
http://dx.doi.org/10.1021/ie030668x
[5] Pham, Q.T. (1983) Behavior of a Conical Spouted-Bed Dryer for Animal Blood. The Canadian Journal of Chemical Engineering, 61, 426-434.
http://dx.doi.org/10.1002/cjce.5450610325
[6] Medeiros, M.F.D. , Rocha, S.C.S., Alsina, O.L.S. , Jerônimo, C.E.M. , Medeiros, U.K.L. and da Mata, A.L.M.L. (2002) Drying of Pulps of Tropical Fruits in Spouted Bed: Effect of Composition on Dryer Performance. Drying Technology, 20, 855-881.
http://dx.doi.org/10.1081/DRT-120003767
[7] Nascimento, B.S., Freire, F.B. and Freire, J.T. (2013) Moisture Prediction during Paste Drying in a Spouted Bed. Drying Technology, 31, 1808-1816.
http://dx.doi.org/10.1080/07373937.2013.825627
[8] Ochoa-Martinez, L.A., Brennan, J.G. and Niranjan, K. (1993) Spouted Bed Dryer for Liquid Foods. Food Control, 4, 41-45.
http://dx.doi.org/10.1016/0956-7135(93)90126-9
[9] Himmelblau, D.M. (2008) Accounts of Experiences in the Application of Artificial Neural Networks in Chemical Engineering. Industrial & Engineering Chemical Research, 47, 5782-5796.
http://dx.doi.org/10.1021/ie800076s
[10] Wang, Z.G., Bi, H.T., Lim, C.J. and Su, P.C. (2004) Determination of Minimum Spouting Velocities in Conical Spouted Beds. The Canadian journal of Chemical Engineering, 82, 11-19.
http://dx.doi.org/10.1002/cjce.5450820103
[11] Kmiec, A. (1983) The Minimum Spouting Velocity in Conical Beds. The Canadian Journal of Chemical Engineering, 61, 274-280.
http://dx.doi.org/10.1002/cjce.5450610304
[12] Olazar, M., San José, M.J. and Bilbao, J. (2011) Conical Spouted Beds. In: Epstein, N. and Grace, J.R., Eds., Spouted and Spouted-Fluid Beds: Fundamentals and Applications, Cambridge University Press Co., New York, 82-104.
[13] Altzibar, H., Lopez, G., Bilbao, J. and Olazar, M. (2014) Operating and Peak Pressure Drops in Conical Spouted Beds Equipped with Draft Tubes of Different Configuration. Industrial & Engineering Chemical Research, 53, 415-427.
http://dx.doi.org/10.1021/ie402031t
[14] Moustoufi, N., Kulah, G. and Koksal, M. (2015) Flow Structure Characterization in Conical Spouted Beds Using Pressure Fluctuation Signals. Powder Technology, 269, 392-400.
http://dx.doi.org/10.1016/j.powtec.2014.09.028
[15] Bi, X. (2011) Initiation of Spouting. In: Epstein, N. and Grace, J.R., Eds., Spouted and Spouted-Fluid Beds: Fundamentals and Applications, Cambridge University Press Co., New York, 17-28.
[16] Mukhlenov, I.P. and Gorshtein, A.E. (1965) Investigation of a Spouted Bed. Khimicheskaya Promyshlennost, 41, 443-446.
[17] Gelperim, N.I., Ainshtein, V.G. and Timokhova, L.P. (1961) Hydrodynamic Features of Fluidization of Granular Materials in Conical Sets. Khimicheskoe i Neftyanoe Mashinostroenie, 4, 12.
[18] Olazar, M., San José, M.J., Aguayo, A.T., Arandes, J.M. and Bilbao, J. (1993) Pressure Drop in Conical Spouted Beds. The Chemical Engineering Journal, 51, 53-60.
http://dx.doi.org/10.1016/0300-9467(93)80008-C
[19] Almeida, A.R.F., Freire, F.B. and Freire, J.T. (2010) Transient Analysis of Pasty Material Drying in a Spouted Bed of Inert Particles. Drying Technology, 28, 330-340.
http://dx.doi.org/10.1080/07373931003627189
[20] Rodrigues, C.C. (1993) Analysis of Drying of Suspensions in Spouted Bed with Inert Particles. MSC Dissertation, Federal University of São Carlos, São Carlos. (In Portuguese)
[21] Patel, K., Bridgwater, J., Baker, C.G. and Schneider, T. (1986) Spouting Behavior of Wet Solids. In: Mujumdar, A.S. and Roques, M.A., Eds., Drying’86, Hemisphere Publishing Corporation, New York, 183-189.
[22] Schneider, T. and Bridgwater, J. (1993) The Stability of Wet Spouted Beds. Drying Technology, 11, 277-301.
http://dx.doi.org/10.1080/07373939308916820
[23] Bitti, M.T., Perazzini, H., Freire, F.B. and Freire, J.T. (2012) Analysis of the Influence of Operating Conditions on the Evaporation Rate of Water during Drying in a Spouted Bed. Proceedings of 18th International Drying Symposium, Xiamen, 11-15.
[24] Elperin, I.T., Zabrodsky, S.S., Yefremtsev, V.S. and Mikhailik, V.D. (1967) On the Best Construction of Sets for Spouting Beds. Collected Papers on “Intensification on Transfer of Heat and Mass in Drying and Thermal Processes”, Nauka I Tekhnika BSSR, Minsk, 323.
[25] Lim, C.J. and Grace, J.R. (1987) Spouted Bed Hydrodynamics in a 0.91 m Diameter Vessel. Canadian Journal Chemical Engineering, 65, 366-372.
http://dx.doi.org/10.1002/cjce.5450650303
[26] He, Y.-L., Lim, C.J. and Grace, J.R. (1992) Spouted Bed and Spout-Fluid Bed Behaviour in a Column of Diameter 0.91 m. The Canadian Journal of Chemical Engineering, 70, 848-857.
http://dx.doi.org/10.1002/cjce.5450700505
[27] San José, M.J., Olazar, M., Llamosas, R., Izquierdo, M.A. and Bilbao, J. (1996) Study of Dead Zone and Spout Diameter in Shallow Spouted Beds of Cylindrical Geometry. The Chemical Engineering Journal, 64, 353-359.

  
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