THERMAL SCIENCE

International Scientific Journal

THREE PHASE EULERIAN-GRANULAR MODEL APPLIED ON NUMERICAL SIMULATION OF NON-CONVENTIONAL LIQUID FUELS COMBUSTION IN A BUBBLING FLUIDIZED BED

ABSTRACT
The paper presents a two-dimensional CFD model of liquid fuel combustion in bubbling fluidized bed. 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 model is taking into account also the third - liquid phase, as well as its interaction with the solid and gas phase. The proposed numerical model comprise energy equations for all three phases, as well as the transport equations of chemical components with source terms originated from the component conversion. In the frame of the proposed model, user sub-models were developed for heterogenic fluidized bed combustion of liquid fuels, with or without water. The results of the calculation were compared with experiments on a pilot-facility (power up to 100 kW), combusting, among other fuels, oil. The temperature profiles along the combustion chamber were compared for the two basic cases: combustion with or without water. On the basis of numerical experiments, influence of the fluid-dynamic characteristics of the fluidized bed on the combustion efficiency was analyzed, as well as the influence of the fuel characteristics (reactivity, water content) on the intensive combustion zone. [Projekat Ministarstva nauke Republike Srbije, br. TR33042: Improvement of the industrial fluidized bed facility, in scope of technology for energy efficient and environmentally feasible combustion of various waste materials in fluidized bed]
KEYWORDS
PAPER SUBMITTED: 2015-10-25
PAPER REVISED: 2015-11-04
PAPER ACCEPTED: 2015-11-05
PUBLISHED ONLINE: 2015-12-13
DOI REFERENCE: https://doi.org/10.2298/TSCI151025196N
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Supplement 1, PAGES [S133 - S149]
REFERENCES
  1. Tsuji. Y.. Kawaguchi. T.. Tanaka. T., Discrete particle simulation of two dimensional fluidized bed. Powder Technology 77 (1993), 1, pp. 79-87.
  2. Hoomans. B.P.B.. Kuipers. J.A.M.. Briels. W.J.. van Swaaij. W.P.M.. Discrete particle simulation of bubbling and slug formation in a two-dimensional gas- fluidized bed: a hard-sphere approach. Chemical Engineering Science 51 (1996), 1, pp. 99-118.
  3. Gera. D.. Gautam.M.. Tsuji. Y.. Kawaguchi. T.. Tanaka. T.. Computer simulation of bubbles in large-particle fluidized beds, Powder Technol, 98 (1998), pp. 38-47.
  4. Ibsen. C.. Helland. E.. Hjertager. B.. Solberg. T.. Tadrist. L.. Occelli. R... Comparison of multifluid ans discrete particle modelling in numerical predictions of gas particle flow in circulating fluidised beds, Powder Technol, 149 (2004). pp. 29-41.
  5. Bokkers GA. van Sint Annaland M. Kuipers JAM. Mixing and segregation in a disperse gas-solid fluidised bed: a numerical and experimental study, Powder Technol., 140 (2004), pp. 176-86.
  6. Alberto Di Renzo. Francesco Paolo Di Maio. Homogeneous and bubbling fluidization regimes in DEM-CFD simulations: hydrodynamic stability of gas and liquid fluidized beds, Chem. Eng. Sci. 62 (2007), pp. 116-130.
  7. H. Enwald. E. Peiran. A.E. Almstedt. B. Leckner. Simulation of the fluid dynamics of a bubbling fluidized bed. Experimental validation of the two-fluid model and evaluation of a parallel multiblock solver. Chem. Eng. Sci. 54 (1999) pp. 311-328.
  8. Cammarata L. Lettieri P. Micale GDM. Colman D. 2d and 3d CFD simulations of bubbling fluidized beds using Eulerian-Eulerian models. Int J Chem Reactor Eng 48 (2003), 1, pp. 1-10.
  9. Behjat Y. Shahhosseini S. Hashemabadi SH. CFD modeling of hydrodynamic and heat transfer in fluidized bed reactors. Int Commun Heat Mass Transfer, 35 (2008), pp. 357-368.
  10. Gidaspow. D., Multiphase Flow and Fluidization: Continuum and Kinetic Theory Descriptions. San Diego. Academic Press (1994).
  11. van Wachem. B.G.M.. Schouten. J.C.. van den Bleek. C.M.. Krishna. R.. Sinclair. J.L., Comparative analysis of CFD models of dense gas-solid systems. AIChE Journal, 47 (2001), 5, pp. 1035-1051.
  12. van der Hoef. M.A.. van Sint Annaland. M.. Kuipers. J.A.M.. Computational fluid dynamics for dense gas-solid fluidized beds: a multi-scale modeling strategy. Chemical Engineering Science 59 (2004), 22. pp. 5157-5165.
  13. Chapman. S.. Cowling. T.G.. The Mathematical Theory of Non-Uniform Gases. 3rd ed. Cambridge University Press. Cambridge, (1970).
  14. Syamlal. M. and T. J. O'Brien. "Simulation of Granular Layer Inversion in Liquid Fluidized Beds." Int. J. Multiphase Flow. 14 (1988), 4, pp. 473-481.
  15. S. Nemoda, M. Mladenović, M. Paprika, D. Dakić, A. Erić, M. Komatina, Euler-Euler granular flow model of liquid fuels combustion in a fluidized reactor, J. Serb. Chem. Soc. 80 (2015), 3, pp. 377-389.
  16. Stevan Đ. Nemoda, Milica R. Mladenović, Dragoljub V. Dakić, Mirko S. Komatina, Aleksandar M. Erić, Milijana J. Paprika, Euler-Euler Granular Flow Model Applied on Numerical Simulation of Liquid Fuels Combustion in a Fluidized Bed, Proceedings on CD ROM, 16th Symposium on Thermal Science and Engineering of Serbia, Sokobanja, Serbia, October 22-25, (2013), pp. 311-323.
  17. Wojciech P. Adamczyk. Gabriel Wecel. Marcin Klajny. Paweł Kozołub. Adam Klimanek. Ryszard A. Białecki. Modeling of particle transport and combustion phenomena in a large-scale circulating fluidized bed boiler using a hybrid Euler-Lagrange approach. Particuology 16 (2014), pp. 29-40.
  18. Milica R. Mladenović and Dragoljub V.Dakić. Stevan Đ. Nemoda. Rastko V. Mladenović. Aleksandar M. Erić. 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, Sokobanja, Serbia, October 18-21, (2011), pp 490-499.
  19. S. Oka, Fluidized bed combustion, Marcel Decker Inc., New York, USA, (2004), 591 pages.
  20. Farshid Vejahati. Nader Mahinpey. Naoko Ellis and Mehrdokht B. Nikoo. CFD Simulation of Gas-Solid Bubbling Fluidized Bed: A New Method for Adjusting Drag Law. Can. J. Chem. Eng. 87(2009), pp. 19-30.
  21. Shailendra Kumar Pandey, CFD Simulation of Hydrodynamics of Three Phase Fluidized Bed, M.Sc. thesis. National Institute of Technology, Orissa, India, (2910).
  22. Syamlal. M.. W. Rogers and T. J. O'Brien., MFIX Documentation Theory Guide, U.S. Department of Energy Office of Fossil Energy Morgantown Energy Technology Center. Morgantown. WV (1993).
  23. Lun. C. K. K.. S. B. Savage. D. J. Jeffrey and N. Chepurniy., Kinetic Theories for Granular Flow: Inelastic Particles in Couette Flow and Slightly Inelastic Particles in a General Flow Field, J. Fluid Mech. 140 (1984), pp. 223-256.
  24. D. G. Schaeffer. Instability in the Evolution Equations Describing Incompressible Granular Flow. J. Diff. Eq.. 66 (1987), pp. 19-50.
  25. D. Gidaspow. R. Bezburuah. and J. Ding. Hydrodynamics of Circulating Fluidized Beds. Kinetic Theory Approach. In Fluidization VII. Proceedings of the 7th Engineering Foundation Conference on Fluidization. (1992), pp. 75-82.
  26. Gunn. D.J., Transfer of heat or mass to particles in fixed and fluidized beds". Int. J. Heat Mass Transfer. 21 (1978), pp. 467-476.
  27. W. E. Ranz and W. R. Marshall. Jr. Evaporation from Drops. Part I. Chem. Eng. Prog.. 48 (1952), 3, pp. 141-146.
  28. W. E. Ranz and W. R. Marshall. Jr. Evaporation from Drops. Part II. Chem. Eng. Prog.. 48 (1952), 4, pp. 173-180.
  29. K. K. Y. Kuo, Principles of Combustion, John Wiley and Sons, New York, (1986).

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