Michigan South Central Power Agency (MSCPA) operates a nominal 55 MW unit with a limestone forced oxidized WFGD system. It has been in operation since 1983. The absorber was a tray tower with a single tray designed for 90% SO{sub}2 removal and supplied by The Babcock & Wilcox Company (B&W). The boiler fires high sulfur eastern bituminous coal producing SO{sub}2 loadings up to 7.5 lbs/MBtu. To increase the removal in the WFGD system, MSCPA and B&W added a second tray in 2002 to take advantage of dual tray technology. SO{sub}2 removal has been increased from 90% to 98% without the use of organic acids. Performance tests and parametric tests have been performed on the system over the last 2 years. The testing also included tests for SO{sub}3, HF, HCl, and PM. This paper will discuss the absorber design, operating parameters, results of the testing and system chemistry.
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