Furance sorbent injection for SO/sub 2/ reduction in cyclone-equipped boilers: Final report

During 1985 and 1986, the Electric Power Research Institute (EPRI), Baltimore Gas and Electric (BG and E), Atlantic Electric, and Babcock and Wilcox (B and W) cofunded a program to evaluate the potential of dry sorbent injection technology for reducing sulfur emissions from cyclone-equipped boilers. Although numerous sorbent injection investigations applying the technology to pulverized-coal-fired systems have been reported, those results cannot be translated directly to cyclone-equipped units primarily because cyclone boilers have shorter gas residence times in the sulfation window. Other differences that could affect sulfur capture by in-furnace injection of dry sorbents are the combustion gas flow patterns and the relatively low fly ash levels. Therefore, a pilot-scale project was conducted at B and W's Alliance Research Center (ARC) to address these variations and assess the applicability of this technology specifically for cyclone-equipped units. The principal objective of this test program was to determine whether furnace sorbent injection could reduce sulfur emissions in cyclone units by nominally 50% at a calcium-to-sulfur (Ca/S) molar ratio of less than/equal to 2:1 and to assess the associated boiler operability concerns. Presuming success, the project also sought to establish a sufficient data base to provide confidence to proceed with a full-scale cyclonemore » demonstration of the technology. 29 refs., 71 figs., 19 tabs.« less