A pilot-scale study of the Ohio State Carbonation Ash Reactivation (OSCAR) process was performed todemonstrate the reactivity of two novel calcium-based sorbents toward sulfur and trace heavy metal (arsenic,selenium, and mercury) capture in the furnace sorbent injection (FSI) mode on a 0.365 m
3/s slipstream of abituminous coal-fired stoker boiler. The sorbents were synthesized by bubbling CO
2 to precipitate calciumcarbonate (a) from the unreacted calcium present in the lime spray dryer ash and (b) from calcium hydroxideslurry that contained a negatively charged dispersant. The heterogeneous reaction between these sorbents andSO
2 gas occurred under entrained flow conditions by injecting fine sorbent powders into the flue gas slipstream.The reacted sorbents were captured either in a hot cyclone (~650
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C) or in the relatively cooler downstreambaghouse (~230
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C). The baghouse samples indicated ~90% toward sulfation and captured arsenic, seleniumand mercury to 800 ppmw, 175 ppmw and 3.6 ppmw, respectively.