COMBUSTION OF LOW GRADE FRACTIONS OF LUBNICA COAL IN FLUIDIZED BED

Abstract

In this paper a method of examination of fuel suitability for fluidized bed combustion is presented. The research of combustion characteristics of low grade fractions of Lubnica brown coal in the fluidized bed by the aforementioned methodology has been carried out on a laboratory semi-industrial apparatus of 200 kWt. Description of the experimental fluidized bed combustion facility is given, as well as experimental results, with the focus on furnace temperature distribution, in order to determine the location of the zone of intensive combustion. Based on investigation results, which are focused on combustion quality (combustion completion) as well as on satisfying the environmental protection criteria, it can be stated that the investigated coal is suitable for burning in bubbling, as well as in circulating fluidized bed.

Keywords

Dates

  • Submission Date2011-05-30
  • Revision Date2011-11-11
  • Acceptance Date2011-12-27

DOI Reference

10.2298/TSCI1201297M

References

  1. Mladenović, M. et al., Criteria Selection for the Assessment of Serbian Lignites Tendency to Form Deposits on Power Boilers Heat Transfer Surfaces, Thermal Science, 13 (2009), 4, pp. 61-78
  2. Saxena, S. C., Jotshi, C. K., Fluidized Bed Incineration of Waste Materials, Progress in Energy and Combustion Science, 20 (1994), 4, pp. 281-324
  3. Leckner, B., Fluidized Bed Combustion Research and Development in Sweden - a Historical Survey, Thermal Science, 7 (2003), 2, pp. 3-16
  4. Kakaras, E., et al., Fluidized Bed Combustion with the Use of Greek Solid Fuels, Thermal Science, 7 (2003), 2, pp. 33-42
  5. Oka, S., et al., Investigation of the Suitability of Serbian Lignite Kolubara and Kovin for Burning in CFBC Boilers (in Serbian), Termotehnika, 30 (2004), 1-4, pp. 83-103
  6. Oka, S., How to Use Data About Coal Combustion in Bubbling Fluidized Beds for DESIGN of the Circulating Fluidized Bed Boilers? Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, www.processeng.biz/iea-fbc.org/upload/oka.pdf
  7. Oka, S. N., Fluidized Bed Combustion, Marcel Dekker, New York, USA, 2004
  8. ***, Regulation on the Emission Limit Values of the Pollutants in the Air (in Serbian), Official Gazette of the Republic of Serbia, Belgrade, No. 71, 2010
  9. Grubor, B. D., et al., Biomass FBC Combustion - Bed Agglomeration Problems, Proceedings (Ed. K. J. Heinschel), 13th International Conference on Fluidized Bed Combustion, Corfu, Greece, 1995, ASME, Vol. 1, pp. 515-522
  10. Oka, S., et al., The Methodology for the Investigation of Fuel Suitability for FBC and Results of Comparative Study of Different Coals, Fluidized Bed Combustion in Practice: Clean, Versatile, Economic, Institute of Energy, London, 1988, pp. I/8/1-19
  11. Mladenović, M., et al., Fluidized Bed Combustion of Low Grade Fractions of Lubnica Coal, Proceedings on CD, Power Plants 2010, Vrnjačka Banja, Serbia, 2010
  12. Nemoda, S., et al., Numerical Simulation of Penetration of Gas Jets into the Fluidized Bed (in Serbian), Termotehnika, 34 (2008), 2-3, pp. 97-116
  13. Mladenović, M., et al., Investigation of Combustion of Waste Oils and Greases on Semi-Industrial Apparatus with Fluidized Bed (in Serbian), Termotehnika, 34 (2008), 2-3, pp. 147-160
  14. Dakić, D., Oka, S., Grubor, B., Investigation of Incipient Fluidization and Expansion of a Course Particle Bed (in Russian), in׃ Transport Processes in High-Temperature and Chemically Reacting Flows (Eds. S. S. Kutateladze, S. Oka), Novosibirsk, USSR, 1982, pp. 76-90
  15. Patumsawad, S., Cliffe, K. R., Experimental Study on the Fluidised Bed Combustion of High Moisture Municipal Waste, Energy Conversion and Management, 43 (2002), 17, pp. 2329-2340
  16. Hernandez-Atonal, F. D., et al., Combustion of Refuse Derived Fuel, Chemical Engineering Science, 62 (2007), 1-2, pp. 627-635
  17. Johari, A., et al., Effects of Fluidization Number and Air Factor on the Combustion of Mixed Solid Waste in a Fluidized Bed, Applied Thermal Engineering 31 (2011), 11-12, pp. 1861-1868
  18. Miccio, F., et al., Dispersion and Combustion of a Bitumen-Based Emulsion in Bubbling Fluidized Bed., Proceedings, 15th FBC Conference, ASME 1999, Paper no. FBC99-0141, Savannah, Geo., USA
  19. Okasha, F. M., El-Eman, S. H., Mostafa, H. K., The Fluidized Bed Combustion of a Heavy Liquid Fuel, Second Mediterranean Combustion Symposium, Experimental Thermal and Fluid Science, 27 (2003), 4, pp. 473-480,
  20. Scala, F., Salatino, P., Modelling Fluidized Bed Combustion of High-Volatile Solid Fuels, Chemical Engineering Science, 57 (2002), 7, pp. 1175-1196
  21. Knobiga, T., et al., Comparison of Large- and Small-Scale Circulating Fluidized Bed Combustors with Respect to Pollutant Formation and Reduction for Different Fuels, Fuel, 77 (1998), 14, pp. 1635-1642
Volume 16, Issue 1, Pages297 -311