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SUPPORT STUDIES IN FLUIDIZED-BED COMBUSTION, 1978 ANNUAL REPORT
Citation:
Johnson, I., G. Vogel, S. Lee, D. Moulton, AND F. Nunes. SUPPORT STUDIES IN FLUIDIZED-BED COMBUSTION, 1978 ANNUAL REPORT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/7-79/203.
Description:
The report gives results of laboratory- and process-scale EPA studies supporting the national development of atmospheric and pressurized fluidized-bed combustion (PFBC) of coal. Program objectives are: (1) to develop basic information needed to optimize the use of limestone for SO2 emission control from FBC; and (2) to develop information on processes to treat high-temperature high-pressure gases from PFBC, enabling them to be used to operate gas turbines. Limestone sulfation enhancement experiments showed CaCl2 and MgCl2 to be more effective than NaCl in increasing the pore size and hence the sulfation capability of calcined limestones. Experiments to evaluate coal-pyrolysis char as a feedstock for FBC were conducted on Wyoming subbituminous coal pyrolyzed at about 650 C. Char combustion efficiencies were 94-99%. The use of oil shale for SO2 emission control in FBC was evaluated. Considerably larger quantities of shale (than limestone or dolomite) would be required because of shale's lower CaO content. Studies are being conducted to assist in preventing hot-corrosion of turbine blades by alkali-metal compounds from PFBC. Results of one set of experiments show that various mineral additives are highly effective in retaining Na and K in the bed: 90-95% of the elements can be retained.