International Scientific Journal


Lately, experimental methods and numerical simulations are equally employed for the purpose of developing incineration BFB facilities. The paper presents the results of the two-dimensional CFD model of liquid fuel combustion in bubbling fluidized bed, applied for numerical simulation of a fluidized bed furnace. The numerical procedure is based on the two-fluid Euler-Euler approach, where the velocity field of the gas and particles are modeled in analogy to the kinetic gas theory. The proposed numerical model comprises energy equations for all three phases (gas, inert fluidized particles, and liquid fuel), as well as the transport equations of chemical components that are participating in the reactions of combustion and devolatilization. The model equations are solved applying a commercial CFD package, whereby the user sub-models were developed for heterogenic fluidized bed combustion of liquid fuels and for interphase drag forces for all three phases. The results of temperature field calculation were compared with the experiments, carried out in-house, on a BFB pilot-facility. The numerical experiments, based on the proposed mathematical model, have been used for the purposes of analyzing the impacts of various fuel flow rates, and fluidization numbers, on the combustion efficiency and on the temperature fields in the combustion zone. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. TR33042: Improvement of the industrial fluidized bed facility, in the scope of technology for energy efficient and environmentally feasible combustion of various waste materials in fluidized bed]
PAPER REVISED: 2017-10-10
PAPER ACCEPTED: 2017-12-18
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  1. Saxena, S.,C. Jotshi, Fluidized-bed incineration of waste materials, Progress in Energy and Combustion Science, 20. (1994), 4, pp. 281-324
  2. Tsuji, Y., et al., Discrete particle simulation of two-dimensional fluidized bed, Powder Technology, 77. (1993), 1, pp. 79-87
  3. Hoomans, B., et al., Discrete particle simulation of bubble and slug formation in a two-dimensional gas-fluidised bed: a hard-sphere approach, Chemical Engineering Science, 51. (1996), 1, pp. 99-118
  4. Gera, D., et al., Computer simulation of bubbles in large-particle fluidized beds, Powder Technology, 98. (1998), 1, pp. 38-47
  5. Ibsen, C.H., et al., Comparison of multifluid and discrete particle modelling in numerical predictions of gas particle flow in circulating fluidised beds, Powder Technology, 149. (2004), 1, pp. 29-41
  6. Bokkers, G., et al., Mixing and segregation in a bidisperse gas-solid fluidised bed: a numerical and experimental study, Powder Technology, 140. (2004), 3, pp. 176-186
  7. Di Renzo, A.,F.P. Di Maio, Homogeneous and bubbling fluidization regimes in DEM-CFD simulations: hydrodynamic stability of gas and liquid fluidized beds, Chemical Engineering Science, 62. (2007), 1, pp. 116-130
  8. Enwald, H., et al., Simulation of the fluid dynamics of a bubbling fluidized bed. Experimental validation of the two-fluid model and evaluation of a parallel multiblock solver, Chemical Engineering Science, 54. (1999), 3, pp. 311-328
  9. Cammarata, L., et al., 2D and 3D CFD simulations of bubbling fluidized beds using Eulerian-Eulerian models, International Journal of Chemical Reactor Engineering, 1. (2003), 1
  10. Behjat, Y., et al., CFD modeling of hydrodynamic and heat transfer in fluidized bed reactors, International Communications in Heat and Mass Transfer, 35. (2008), 3, pp. 357-368
  11. Gidaspow, D., Multiphase flow and fluidization: continuum and kinetic theory descriptions. Academic press, 1994.
  12. Van Wachem, B., et al., Comparative analysis of CFD models of dense gas-solid systems, AIChE Journal, 47. (2001), 5, pp. 1035-1051
  13. van der Hoef, M.A., et al., Computational fluid dynamics for dense gas-solid fluidized beds: a multi-scale modeling strategy, Chemical Engineering Science, 59. (2004), 22, pp. 5157-5165
  14. Chapman, S.,T.G. Cowling, The mathematical theory of non-uniform gases: an account of the kinetic theory of viscosity, thermal conduction and diffusion in gases. Cambridge university press, 1970.
  15. Syamlal, M.,T. O'brien, Simulation of granular layer inversion in liquid fluidized beds, International Journal of Multiphase Flow, 14. (1988), 4, pp. 473-481
  16. Nemoda, S., et al., Euler-Euler granular flow model of liquid fuels combustion in a fluidized reactor, Journal of the Serbian Chemical Society, 80. (2015), 3, pp. 377-389
  17. Nemoda, S.Ð., et al., Three phase eulerian-granular model applied on numerical simulation of non-conventional liquid fuels combustion in a bubbling fluidized bed, Thermal Science, 20. (2016), suppl. 1, pp. 133-149.
  18. Oka, S., Fluidized bed combustion, Marcel Dekker, Inc., New York, Basel, 2004.
  19. Vejahati, F., et al., CFD simulation of gas-solid bubbling fluidized bed: a new method for adjusting drag law, The Canadian Journal of Chemical Engineering, 87. (2009), 1, pp. 19-30
  20. Pandey, S.K., Simulation of Hydrodynamics of Three Phase Fluidized Bed, MSc, National Institute of Technology, Orissa, India,2009.
  21. Gidaspow, D., et al., Hydrodynamics of circulating fluidized beds: kinetic theory approach, 'Report, Illinois Inst. of Tech., Chicago, IL (United States). Dept. of Chemical Engineering, 1991.
  22. Gunn, D., Transfer of heat or mass to particles in fixed and fluidised beds, International Journal of Heat and Mass Transfer, 21. (1978), 4, pp. 467-476
  23. Ranz, W.,W. Marshall, Evaporation from drops, Part I, Chem. Eng. Prog, 48. (1952), 3, pp. 141-146
  24. Ranz, W.,W. Marshall, Evaporation from drops, Part II, Chem. Eng. Prog, 48. (1952), 4, pp. 173-180
  25. Kuo, K.K., Principles of combustion. (1986),
  26. Mladenovic, M.R.,D.V. Dakic, Stevan Ð. Nemoda. Rastko V. Mladenovic. Aleksandar M. Eric. Milijana Paprika. Mirko S. Komatina. Vertical temperature profile in the installation for the combustion of waste fuels in the fluidized bed furnace, Conference proceedings on CD-ROM, 15th Symposium on Thermal Science and Engineering of Serbia, pp. 18-21
  27. Nemoda, S.Ð., et al., Numerical calculation and measurement of the coal powder distribution in burner's channels with louvers and analysis of related theoretical combustion temperatures on TPP'Nikola Tesla'-A6 boilers, Termotehnika, 37. (2011), 2, pp. 223-240

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