Spatial distributions of O2, CO2 and SO2 in a pilot-scale fluidized bed combustor operated with different coals |
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Authors: | Klaus Schü tte Winfried Wittler Gerd Rotzoll and Karl Schü gerl |
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Affiliation: | Institut für Technische Chemie, Universität Hannover, Callinstr, 3, 3000, Hannover 1, FRG |
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Abstract: | Axial concentration profiles of O2, CO2 and SO2 have been measured at different radial positions in a coal-fired fluidized bed combustor. The profiles show some spatial inhomogeneity in the bed, the degree of which depends on fluidizing velocity and amount of excess air. Comparison of SO2- with CO2-concentration profiles reveals that SO2 is formed in proportion to CO2 only with anthracite as fuel. With bituminous coals, SO2 is preferentially formed near the coal feed point. These results are discussed with regard to characteristic times of mixing and chemical reaction in fluidized beds, and SO2-formation characteristics of the employed coals obtained in a thermobalance. |
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Keywords: | combustion fluidized beds coal |
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