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Received April 6, 2002
Accepted May 15, 2002
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Enhancement of Combustion Efficiency with Mixing Ratio during Fluidized Bed Combustion of Anthracite and Bituminous Blended Coal
Dept. of Environ. Eng., Dongseo University, Busan 617-716, Korea 1Dept. of Environ. Eng., Pukyong National University, Busan 608-737, Korea 2Dept. of Marine Environ. Eng., Cheju National University, Cheju 690-756, Korea
leejk@pknu.ac.kr
Korean Journal of Chemical Engineering, November 2002, 19(6), 1059-1065(7), 10.1007/BF02707233
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Abstract
In order to investigate the effect of mixing ratio of bituminous coal to blended coal on the enhancement of combustion efficiency, combustion experiments of blended coal with anthracite and bituminous are done in a laboratory scale fluidized bed combustor (10.8 cm ID and 170 cm height). The gross heating values of anthracite and bituminous coal used in this study are 2,810 cal/g and 6,572 cal/g, respectively. Experimental parameters are fuel feed rate, superficial gas velocity and mixing ratio of bituminous coal to blended coal. The combustion efficiency increases_x000D_
with the mixing ratio of bituminous coal due to the lower unburned carbon losses and higher burning velocity of bituminous coal. The rate of combustion in the combustor was increased with mixing ratio resulted from a higher burning velocity of bituminous coal. The measured combustion efficiency experimentally is about 3.5-12.4% higher than that of the calculated value based on the individual combustion of anthracite and bituminous coal under the same operating conditions. The optimum mixing ratio (MR) of bituminous coal determined is around 0.75 in this study.
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