Numerical Analysis of the Sugarcane Bagasse Drying by Cyclone

Abstract:

Article Preview

Drying is a simultaneous process of heat and mass transfer and dimensional changes. In recent years, cyclones have been used as a modern drying technology. In this sense, this research proposes a numerical study to describe drying of sugarcane bagasse, using the cyclone as dryer. Herein, it was adopted the Eulerian-Lagrangian model in steady state. The Reynolds stress model was considered to describe turbulence of the gas phase, while a transient lumped model was used to describe heat and mass transfer on the particulate phase (sugarcane bagasse). Particles were considered with irregular shape, composed of a binary mixture (solid part and water). The solution of the proposed model was obtained using the commercial software Ansys CFX 12. Results of the moisture content, temperature, dimension variation, and paths of particles, as well as velocity, pressure, and temperature distributions of the gas phase inside the cyclone are presented and analyzed. It has been found that the obtained components for axial and tangential velocity inside the cyclone are in good agreement with experimental data available in the literature, and that the drying kinetics, heating, dimensional variations, and residence time of particles are affected by the velocity of the gas phase, velocity of the particles, and the flow direction of gas and particles at the entrance of the feed duct.

Info:

Periodical:

Diffusion Foundations (Volume 20)

Edited by:

João Delgado and A.G. Barbosa de Lima

Pages:

106-123

Citation:

J.A. Ribeiro de Souza et al., "Numerical Analysis of the Sugarcane Bagasse Drying by Cyclone", Diffusion Foundations, Vol. 20, pp. 106-123, 2019

Online since:

December 2018

Export:

Price:

$38.00

* - Corresponding Author

[1] S. A. Nebra, Sugarcane bagasse pneumatic drying. Doctoral. Thesis in Engineering. State University of Campinas, Campinas, Brazil (1985). (In Portuguese).

[2] P. Audinet, Sugar cane bagasse: Processing technologies and marketing, Economic and political weekly, 29(48) (1994), M149-M155.

[3] F. P.M. Farias, Lima, A. G. B.; Farias Neto, S. R., Influence of the geometrical shape of the feeding duct of a cyclone as dryer. Proceedings of the 11th Brazilian Congress of Thermal Sciences and Engineering, Curitiba, Brazil (2006).

[4] A. S. Fernandes, E. R. Miguel, The importance of the utilization of the sugarcane bagasse in energy generation in thermoelectricity, III Encontro Científico e Simpósio de Educação Unisalesiano, Lins, São Paulo, Brazil (2011).(In Portuguese).

[5] J. L. G. Corrêa, D. R. Graminho, M. A. Silva, S. A. Nebra, Cyclone as a sugar cane bagasse drye, Proceedings of the 13th international Drying Symposium (IDS' 2002) Beijing, China, vol. C, (2002) 1542.

[6] J. L. G. Corrêa, Discussion of cyclone dryer designer parameters, Doctoral Thesis in Mechanical Engineering, State University of Campinas, Campinas, Brazil (2003). (In portuguese).

[7] R. Gomide, Unit operations: Mechanical separation, v. 3, Author Edition, São Paulo, Brazil (1980). (In Portuguese).

[8] H.F. Meier, Phenomenological modeling and two dimensional simulation of cyclone by computational fluid dynamic, Doctoral Thesis in Chemical Engineering, State University of Campinas, Campinas, Brazil (1998). (In Portuguese).

[9] R. L. Salcedo, M. J. Pinho, Pilot and industrial-scale experimental investigation of numerical optimized cyclones, Ind. Eng. Chem. Res., 42(1) (2003) 145-154.

DOI: https://doi.org/10.1021/ie020195e

[10] D. Noriler, A. A. Vegini, C. Soares, A. A. C. Barros, H. F. Meier, M. Mori, A new role for reduction in pressure drop in cyclones using fluid dynamics technique. Brazilian Journal of Chemical Engineering, 21(1) (2004) 93-101.

DOI: https://doi.org/10.1590/s0104-66322004000100010

[11] A. M. B. M. Simões, Numerical simulation of the fluid dynamic of a hydrocyclone in the oil/water separation. Master Dissertation in Chemical Engineering, Federal University of Campina Grande, Campina Grande, Brazil (2005). (In Portuguese).

DOI: https://doi.org/10.21475/ajcs.17.11.06.p569

[12] M. Heumann, Jr, Understanding Cyclone Dust Collectors, Plant Engineering, Fisher-Kosterman, Inc, Louisville (1983).

[13] M. A. Silva, Drying study in cyclone., Doctoral Thesis in Mechanical Engineering, State University of Campinas, Campinas, Brazil (1991). (In Portuguese).

[14] Z. Pakowski, Manual Drypak version 1.3, Program for psychrometric and drying computations, Lodz, Poland (1995).

DOI: https://doi.org/10.1080/07373939408962202

[15] L. Svarovsky, Solid-liquid separation, Ed. Butterworth, Fourth Edition, England (2000).

[16] L. Wang, L. Ye, Reducing pressure drop in cyclones by a stick, Aerosol Sci. Technol., 31(2-3) (1999) 187-193.

[17] S. R. Farias Neto, F.P.M. Farias, J.M.P.Q. Delgado, A.G.B. Lima, A.L. Cunha, Cyclone: Their characteristics and drying technological applications In: J.M.P.Q. Delgado (Ed.), Industrial and Technological Applications of Transport in Porous Materials. Series: Advanced Structured Materials.1 ed. v.36, Springer-Verlag, Heidelberg (Germany), 2013, pp.1-36.

DOI: https://doi.org/10.1007/978-3-642-37469-2_1