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SIMULTANEOUS CONTROL OF HGO, SO2, AND NOX BY NOVEL OXIDIZED CALCIUM-BASED SORBENTS
Citation:
Ghorishi, S. B., C. Singer, W. Jozewicz, C B. Sedman*, AND R K. Srivastava*. SIMULTANEOUS CONTROL OF HGO, SO2, AND NOX BY NOVEL OXIDIZED CALCIUM-BASED SORBENTS. Presented at 94th AWMA ANnual Meeting, Orlando, Florida, 6/24-28/01.
Description:
The paper gives results of an investigation of two classes of calcium (Ca)-based sorbents (hydrated limes and silicate compounds). (NOTE: Efforts to develop multipollutant control strategies have demonstrated that adding certain oxidants to different classes of Ca-based sorbents significantly improves the removal of elemental mercury vapor (Hgo), sulfur dioxide (SO2), and nitrogen oxides (NOx) from simulated flue gases). A number of oxidizing additives were used at different concentrations in the Ca-based sorbent process. The Hgo, SO2, and NOx capture capacities of these oxidant-enriched sorbents were evaluated and compared to those of a commercially available activated carbon in bench-scale, fixed-bed, and fluid-bed systems. Ca-bases sorbents prepared with two oxidants, designated C and P, exhibited Hgo sorption capacities (about 100 ug/g) comparable to that of the activated carbon; they showed far superior SO2 and NOx sorption capacities. Preliminary cost estimates for the process utilizing these novel sorbents indicate potential for substantial lowering of control costs, compared to other processes currently used or considered for control of Hgo, SO2, and NOx emissions from coal-fired boilers. The implications of these findings toward development of multipollutant control technologies are summarized.