New approach to dry SO/sub 2/ removal

Technical report:A process for cleaning boiler flue gas features an open-loop, two-stage design. In the first stage, sulfur dioxide is removed using a spray dryer contactor. The second stage removes particulates using either an electrostatic precipitator or a fabric filter collector. Advantages of the process include: low installation cost; simple operation; online maintenance; and a dry product instead of the usual sludge produced by wet removal were met, with as much as 92% removal accomplished, though 80% removal would be more typical. The fabric filter also produced satisfactory results. While the economics of flue gas desulfurization and particulate control are site specific, the general economics, including capital costs, operating and labor costs, maintenance, and water consumption costs, give a total operating cost of 3.0 mills/kwh/yr. (1 diagram, 1 table)