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 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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Anthony, E. J., Becker, H.A., Code, R.K., Liang, D. T. and Stephenson, J. R., “Combustion of High-Sulfur Eastern Canadian Coals by AFBC,” Proc. of the 8th Int. Conf. on FBC, 32 (1985).
Choi, J.H., Park, Y. S. and Son, J. E., “Present Status of Research and Development of Fluidized Bed Combustion in Korea,” Proceeding of the Fourth International Conference on Fluidization, Japan, 507 (1983).
Choi, S.W., Oh, K. J., Jang, H. T., Tae, B. S. and Doh, D. S., “Gas Emission of Mixed-firing of Anthracite Coal and Bituminous Coal in FBC,”J. of Korean Society of Environmental Engineers,18, 267 (1996).
Jang, J.G., Lee, J. K., Lee, K.H., Lim, J. H., Lim, J. S. and Chun, H. S., “Combustion Characteristics of Digested Sewage Sludge in a Two-Stage Swirl-Flow Fluidized Bed Incinerator,”HWAHAK KONGHAK,30, 499 (1992).
Jung, Y.W. and Park, D. K., “Fluidized Bed Combustion of High Ash Anthracite: Analysis of Combustion Efficiency and Particle Size Distribution,”Korean J. Chem. Eng.,5, 109 (1988).
Lee, J.K., Jang, J.G., Yoa, S. J., Hu, C. G., Lim, J.H. and Chun, H. S., “Combustion Characteristics of Anthracite Coal in a Two-stage Swirl-flow Fluidized Bed Combustor with Flyash Recycle,”Journal of Korean Solid Wastes Engineering Society,9, 107 (1992).
Lee, J.K., Hu, C.G., Shin, Y. S. and Chun, H. S., “Combustion Characteristics of a Two-Stage Swirl-Flow Fluidized Bed Combustor,”Can. J. Chem. Eng.,68, 824 (1990).
Lee, J.K., Hu, C.G., No, J.G., Shin, Y. S. and Chun, H. S., “Combustion Characteristics of Low-Grade Anthracite Coal in a Two-Stage Swirl-Flow Fluidized Bed Combustion (I),”HWAHAK KONGHAK,26, 517 (1988).
Lee, J.K., Lee, K.H., Jang, J.G., Shin, Y. S. and Chun, H. S., “Effect of Parameter on Performance of Two-Stage Swirl-Flow Fluidized Bed Coal Combustors,”J. Chem. Eng. Japan,24, 703 (1991).
Oh, K. J., Cho, S.W., Park, T. S. and Jang, H. T., “Elutriation Characteristics of Mixed-firing of Anthracite Coal and Bituminous Coal in FBC,”J. of Korean Society of Environmental Engineers,17, 369 (1995).
Park, Y. S., Han, K.H., Yi, C. K. and Son, J. E., “Combustion and Pollutants Emission Characteristics of Anthracite and Bituminous Coal Blend in a Fluidized Bed Combustor,”J. of Korean Society of Environmental Engineers,15, 811 (1993).
Radovanovic, M., “Fluidized Bed Combustion,” Hemisphere Publishing Corp., New York (1986).
Sarofim, A. F., “Thermal Processing: Incineration and Pyrolysis,” Handbook of Solid Waste Management, Van Nostrand Reinhold Company (1977).
Song, B.H., Jang, Y.W., Kim, S. D. and Kang, S.K., “Gas Yields from Coal Devolatilization in a Bench Scale Fluidized Bed Reactor,”Korean J. Chem. Eng.,18, 770 (2001).
Taylor, T. E., “Experimental Results from an 0.46m-Diameter Fluid-Bed Pilot Plant,” Proc. of the 2nd Eng. Found. Conf., 258 (1978).
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This paper is dedicated to Professor Dong Sup Doh on the occasion of his retirement from Korea University.
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Jang, JG., Kim, MR., Lee, KH. et al. Enhancement of combustion efficiency with mixing ratio during fluidized bed combustion of anthracite and bituminous blended coal. Korean J. Chem. Eng. 19, 1059–1065 (2002). https://doi.org/10.1007/BF02707233
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DOI: https://doi.org/10.1007/BF02707233