THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

TEMPERATURE OF BURNING COAL PARTICLES DURING COMBUSTION IN FLUIDIZED BED

ABSTRACT
Results of experimental investigation of coal particle temperature are presented in this paper. Experiments were performed with two Yugoslav coals: lignite Kosovo and brown coal Bogovina. The coal particles were shaped into spherical form with diameter of dc = 5, 7 and 10 mm. Air was used as the fluidization gas. The fluidization velocity was in the range vf = 0.18-0.22 m/s. The bed temperature was in the range Tb = 590-700 °C. Inert material was silica sand with the mean bed particle diameter of dp = 0.250 mm. The coal particle temperature was measured by inserting a thermocouple in its center. On the basis of numerous experiments the temperature histories of the coal particles were analyzed in all phases of combustion process in the fluidized bed. Particle and bed temperature difference corresponding to the 50% conversion of burning particle was chosen as the characteristic temperature difference for the whole burning period. This temperature difference for the investigated coals and for different particle diameters was in the range 58-205 °C.
PAPER SUBMITTED: 1999-07-25
PAPER REVISED: 1999-11-21
PAPER ACCEPTED: 2000-03-13
PUBLISHED ONLINE: 2020-09-06
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 1999, VOLUME 3, ISSUE Issue 1, PAGES [47 - 56]
REFERENCES
  1. Roscoe, C., Witkowski, R., Harrison, D., Trans I Chem E (1969), p. 58
  2. Ross, I., Patel, M., Davidson, J., The Temperature of Burning Carbon Particles in Fluidized Beds, Institution of Chemical Engineers, 59 (1981), pp. 83-88
  3. Yates, G., Walker, R., Particle Temperature in Fluidized Bed Combustor, Fluidization, Cambridge University Press, 1978, pp. 241-245
  4. Stubington, J., Comparison of Techniques for Measuring the Temperature of Char Particles Burning in a Fluidized Bed, Institution of Chemical Engineers, 63, (1985), pp. 241-249
  5. Prins, W., Fluidized Bed Combustion of a Single Carbon Particle, Ph. D. Thesis, University of Twente, Enschede, The Netherlands, 1987
  6. Winter, F., Single Fuel Particle and NO,/N>O Emission Characteristics under Circulating Fluidized Bed Combustor Conditions, Ph. D. Thesis, University of Technology, Vienna, September 1995
  7. Komatina, M., Temperature of Coal Particle during Combustion in Fluidized Bed, (in Serbian) Ph. D. Thesis, University of Belgrade, 1997
  8. Macek, A., Bulik, C., Direct Measurement of Char-Particle Temperatures in Fluidized-Bed Combustors, Twentieth Symposium (International) on Combustion, The Combustion Institute, 1984, pp. 1223-1230 i
  9. Linjewile, T., Hull, A., Agarwal, P., Optical Probe Measurement of the Temperature of Burning Particles in Fluidized Beds, Fuel, 73 (1994),12, pp. 1880-1888
  10. Komatina, M., Heat and Mass Transfer of Single Coal Particle During Combustion in Fluidized Bed, (in Serbian) Master Thesis, University of Belgrade, 1992
  11. Komatina, M., Oka, S., Grubor, B., Ilić, M., Experimental Investigation of Heat Transfer between a Bubbling Fluidized Bed and Large Particle, Tenth International Heat Conference, Brighton, 1994, Vol. 3, pp. 215-220
  12. Dakić, D., Grubor, B., Oka, S., Experimental Results of Primary Fragmentation of Eight Different Coals in Fluidized Bed, 37'* IEA Fluidized Bed Conversion Meeting, Paris, November, 1998
  13. ***Thermocoax, Sheated Thermocouple Wire Handbook, Societe anonyme d'etudes et realisation nuclearies, 1965
  14. La Nauze, R., Fundamentals of Coal Combustion in Fluidized Bed, Chem Eng Res Des, 63 (1985), pp. 3-33
  15. Tamarin, I., Galershtein, M., Shuklina, M., J. Engng Physics, 42, (1982)

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence