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FUNDAMENTAL STUDIES OF DRY INJECTION OF CALCIUM-BASED SORBENTS FOR S02 CONTROL IN UTILITY BOILERS
Citation:
Newton, G., D. Moyeda, G. Kindt, J. McCarthy, AND S. Chen. FUNDAMENTAL STUDIES OF DRY INJECTION OF CALCIUM-BASED SORBENTS FOR S02 CONTROL IN UTILITY BOILERS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-88/069 (NTIS PB89134142), 1988.
Description:
The report describes research to determine the mechanisms which limit the extent of reaction between SO2 and calcium-based sorbents (CaCO3 and Ca(OH)2) by measuring the in situ physical structure and reactivity of sorbent injected into a combustion environment for residence times as short as 35 ms. Four models of the sulfation reaction were used to guide the research and interpret the data. The extent of sorbent utilization was found to be limited by porosity losses during the sorbent activation process. In situ porosities, a fraction of that theoretically possible, were measured in the absence of SO2. Calcines from CaCO3 suffered greater losses in porosity than those from Ca(OH)2 which, along with the larger CaCO3 particle size, accounts for the substantial differences in SO2 capture between these two sorbents.