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MODELING OF BIOFUEL PELLETS TORREFACTION IN A REALISTIC GEOMETRY

ABSTRACT
Low temperature pyrolysis also known as torrefaction is considered as a promising pretreatment technology for conversion of biomass into a solid biofuel with enhanced properties in terms of lower moisture and volatile matter content, hydrophobicity and increased heating value. A thermal treatment leads to a non-uniform temperature field and chemical reactions proceeding unevenly within the pellets. However the temperature is assumed to be uniform in the pellets in the majority of models. Here we report on the model of single pellet biomass torrefaction, taking into account the heat transfer and chemical kinetics in the realistic geometry. The evolution of temperature and material density in the non-stationary thermo-chemical process is described by the system of non-linear partial differential equations. The model describing the high-temperature drying of biomass pellet was also introduced. The importance of boundary effects in realistic simulations of biomass pellets torrefaction is underlined in this work.
KEYWORDS
PAPER SUBMITTED: 2015-11-30
PAPER REVISED: 2016-04-29
PAPER ACCEPTED: 2016-04-29
PUBLISHED ONLINE: 2016-07-12
DOI REFERENCE: 10.2298/TSCI151130156A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE 4, PAGES [1223 - 1231]
REFERENCES
  1. Bergman, P. C. A., et al., Torrefaction for Biomass Co-firing in Existing Coal-fired Power Stations, "Biocoal", Report ECN-C-05-013, Energy Research Centre of the Netherlands (ECN), Petten, Nether-lands, 2005.
  2. Van der Stelt, M. J. C., et al., Biomass Upgrading by Torrefaction for the Production of Biofuels: A Review, Biomass Bioenergy, 35 (2011), 9, pp. 3748-3762
  3. Chew, J. J., Doshi, V., Recent Advances in Biomass Pretreatment ‒ Torrefaction Fundamentals and Technology, Renew. Sust. Energ. Rev., 15 (2011), 8, pp. 4212-4222
  4. Bridgeman, T. G., et al., Torrefaction of Reed Canary Grass, Wheat Straw and Willow to Enhance Solid Fuel Qualities and Combustion Properties, Fuel, 87 (2008), 6, pp. 844-856
  5. Bergman, P. C. A., Combined Torrefaction and Pelletisation: The TOP Process, Report ECN-C-05-073, Energy Research Centre of the Netherlands (ECN), Petten, Netherlands, 2005.
  6. Arias, B. R., et al., Influence of Torrefaction on the Grindability and Reactivity of Woody Biomass, Fuel Process Technology, 89 (2008), 2, pp. 169-175
  7. Artiukhina, E., Grammelis, P., Torrefaction of Biomass Pellets: Modeling of the Process in a Fixed Bed Reactor, International Journal of Chemical, Molecular, Nuclear Materials and Metallurgical Engineer-ing, 9 (2015), 12, pp. 1422-1424
  8. Bates, R. B., Ghoniem, A. F., Modeling Kinetics-transport Interactions During Biomass Torrefaction: The Effects of Temperature, Particle Size, and Moisture Content, Fuel, 137 (2014), pp. 216-229
  9. Bates, R. B., Modeling the Coupled Effects of Heat Transfer, Thermochemistry, and Kinetics During Biomass Torrefaction, MSc thesis, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA, 2010.
  10. Van der Stelt, M. J. C., Chemistry and Reaction Kinetics of Biowaste Torrefaction, PhD thesis, Eindho-ven University of Technology, Eindhoven, Netherlands, 2011.
  11. Di Blasi, C., Lanzetta, M., Intrinsic Kinetics of Isothermal Xylan Degradation in Inert Atmosphere, Journal of Analytical and Applied Pyrolysis, 40-41 (1997), pp. 287-303
  12. Prins, M. J., et al., Torrefaction of Wood: Part 1, Weight Loss Kinetic, Journal of Analytical and Ap-plied Pyrolysis, 77 (2006), 1, pp. 35-40
  13. Chen, W. H., Kuo, P. C., Isothermal Torrefaction Kinetics of Hemicellulose, Cellulose, Lignin and Xylan Using Thermogravimetric Analysis, Energy, 36 (2011), 11, pp. 6451-6460
  14. Nocquet, T., et al., Study on Mass Loss and Gas Release During Torrefaction of Woody Biomass and its Constituents for Injection in Entrained Flow Gasifier, in: 3rd International Congress on Green Process Engineering, Kuala-Lumpur, 2011.
  15. Shang, L., et al., Intrinsic Kinetics and Devolatilization of Wheat Straw During Torrefaction, Journal of Analytical and Applied Pyrolysis, 100 (2013), pp. 145-152
  16. Repellin, V., et al., Modelling Anhydrous Weight Loss of Wood Chips During Torrefaction in a Pilot Kiln, Biomass and Bioenergy, 34 (2010), 5, pp. 602-609
  17. Bates, R. B., Ghoniem, A. F., Biomass Torrefaction: Modeling of Volatile and Solid Product Evolution Kinetics, Bioresource Technology, 124 (2012), pp. 460-469
  18. Bergman, P. C. A., et al., Torrefaction for Entrained-flow Gasification of Biomass, Report ECN-C-05-067, Energy Research Centre of the Netherlands (ECN), Netherlands, 2005.
  19. Pach, M., et al., Torrefied Biomass a Substitute for Wood and Charcoal, in: 6th Asia-pacific Internation-al Symposium on Combustion and Energy Utilization, 2002.
  20. Prins, M. J., Thermodynamic Analysis of Biomass Gasification and Torrefaction, PhD thesis, Eindho-ven University of Technology, Eindhoven, Netherlands, 2005.
  21. Felfli, F. F., et al., Wood Briquette Torrefaction, Energy for Sustainable Development, 9 (2005), 3, pp. 19-22
  22. Yan, W., et al., Thermal Pretreatment of Lignocellulosic Biomass, Environmental Progress and Sus-tainable Energy, 28 (2009), 3, pp. 435-440
  23. Chen, W-H., et al., An Evaluation on Improvement of Pulverized Biomass Property for Solid Fuel Through Torrefaction, Applied Energy, 88 (2011), 11, pp. 3636-3644
  24. Phanphanich, M., Mani, S., Impact of Torrefaction on the Grindability and Fuel Characteristics of For-est Biomass, Bioresource Technology, 102 (2010), 2, pp. 1246-1253
  25. Dhungana, A., Torrefaction of Biomass, MSc thesis, Dalhousie University, Halifax, Nova Scotia, 2011.
  26. Dhungana, A., et al., Torrefaction of Non-lignocellulose Biomass Waste, The Canadian Journal of Chemical Engineering, 90 (2012), 1, pp. 186-195
  27. Shang, L., et al., Quality Effects Caused by Torrefaction of Pellets Made from Scots Pine, Fuel Pro-cessing Technology, 101 (2013), pp. 23-28
  28. Park, C., et al., Effect of Process Operating Conditions in Biomass Torrefaction: A Simulation Study Using One-dimensional Reactor and Process Model, Energy, 79 (2015), pp. 127-139
  29. Couhert, C., et al., Impact of Torrefaction on Syngas Production from Wood, Fuel, 88 (2009), pp. 2286-2290
  30. Chen, W-H., et al., Thermal Pretreatment of Wood (Lauan) Block by Torrefaction and its Influence on the Properties of the Biomass, Energy, 36 (2011), 5, pp. 3012-3021
  31. Wannapeera, J., et al., Effects of Temperature and Holding Time During Torrefaction on the Pyrolysis Behaviors of Woody Biomass, Journal of Analytical and Applied Pyrolysis, 92 (2011), 1, pp. 99-105
  32. Chen, Q., et al., Influence of Torrefaction Pretreatment on Biomass Gasification Technology, Chinese Science Bulletin, 56 (2011), 14, pp. 1449-1456
  33. Pimchuai, A., et al., Torrefaction of Agriculture Residue to Enhance Combustible Properties, Energy and Fuels, 24 (2010), 9, pp. 4638-4645
  34. Pérre, P., et al., A Comprehensive Dual-scale Wood Torrefaction Model: Application to the Analysis of Thermal Run-away in Industrial Heat Processes, International Journal of Heat and Mass Transfer, 64 (2013), pp. 838-849
  35. Kadem, S., et al., 3d-Transient Modeling of Heat and Mass Transfer During Heat Treatment of Wood, Int. Commun. Heat Mass Transfer, 38 (2011), 6, pp. 717-722
  36. Artiukhina, E., Sin, G., Biomass Pellet Torrefaction: 2D Model Development, Reliability Assessment by Sensitivity and Uncertainty Analyses, (to be published)
  37. Alves, S. S., Figueiredo, J. L., A Model for Pyrolysis of Wet Wood, Chem. Eng. Sci., 44 (1989), 12, pp. 2861-2869
  38. Alverez Noves, H., Fernandez-Golfin Seco, J., Practical Evaluation and Operation of Superheated Steam Drying Process with Different Softwoods and Hardwoods, Eur. J. of Wood and Wood Prod., 52 (1994), 3, pp. 135-138
  39. ***, www.wolfram.com
  40. Artiukhina, E., Grammelis, P., Torrefaction of Biofuel Pellets: Does the Geometry Matter? Proceedings, 10th Conference on Sustainable Development of Energy, Water and Environment Systems, Dubrovnik, Croatia, 2015, SDEWES2015.1144, 1-6.

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