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EXPERIMENTAL STUDY OF HIGH LEVELS OF SO2 REMOVAL IN ATMOSPHERIC-PRESSURE FUIDIZED-BED COMBUSTORS
Kinzler, D. D. AND K. R. Drake. EXPERIMENTAL STUDY OF HIGH LEVELS OF SO2 REMOVAL IN ATMOSPHERIC-PRESSURE FUIDIZED-BED COMBUSTORS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/7-89/004 (NTIS PB89-194187), 1989.
The report describes tests conducted in an atmospheric-pressure-fluidized-bed combustor (FBC) with a cross-section of 1 x 1.6 m) to demonstrate high levels of S02 removal when burning a high-sulfur coal and feeding limestone sorbent for S02 removal. The goal was to achieve 90-plus % S02 removals with reasonable sorbent feed rates, through suitable reductions in sorbent particle size (to improve reaction kinetics) and increases in gas residence time (to increase gas/sorbent contact time), in a manner predicted by an existing mathematical model. At particle sizes averaging 800 and 1300 micrometers (mass mean), and with gas residence times of 0.5 to I. 5 sec, the measured S02 retention levels ranged from 88 to 98% when sorbent was fed at Ca/S molar ratios between 2 and 3. This result supports model predictions. Reducing sorbent particle size and increasing gas residence time resulted in modest increases in S02 removal over the range of conditions tested here. Increases in flue gas 02 content also increased removals. Only one of the three sorbents considered for this project had the attrition resistance necessary to permit use in this testing, indicating that some sorbents will not be suitable for use in dense-phase FBC. N0x emissions ranged from 130 to 236 ng/J during these tests.