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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
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THERMAL SCIENCE YEAR 1999, VOLUME 3, ISSUE Issue 1, PAGES [47 - 56]
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