Gas Suspension Absorption (GSA) Demonstration Plant Air Toxics Characterization

. This report summarizes results of a project to character& air toxic emissions of selected hazardous air pollutants (HAPS) from the AirPol Gas Suspension Absorption SO2 control technology. This project was sponsored by AirPol Inc., the Tennessee Valley Authority (TVA), and the U.S. Department of Energy (DOE). The GSA process utilizes a semi-dry lime scrubber for SO2 and HCI removal. Most of the solids in the GSA reactor are removed from the flue gas and recycled into the reactor. The flue gas from the GSA reactor/cyclone is passed through a dust collector for final patticulate control. AirPol demonstrated the ptocess in a 10 MW pilot-scale plant utilizing a slipstream from a coal-fired utility boiler. The pilot plant consisted of the GSA reactor/cyclone. an ESP. and a small. 1 MW equivalent pulsed jet baghouse. The IO MW pilot-plant was tested in September and October, 1993 at the TVA National Center for Emissions Research located in West Paducah Kentucky. Tbe test program included evaluation of two process configurations: &.t&. The baghouse was operated in series with the ESP. i.e., the flue gas from the GSA reactor/cyclone passed first through the ESP and then the fabric filter; m. The baghouse was operated in parallel with the ESP. meaning that 15-16 percent of the flue gas leaving the GSA reactor/cyclone was introduced to the fabric filter; thus, both the ESP inlet stream and the fabric baghouse stream contained equivalent concentrations of all flue gas constituents; Two test conditions were evaluated in each configuration: baseline, with no lime introduction to the system; and demonstration, with lime injection into the GSA. Three test runs were performed under each condition. Samples for key gaseous, liquid and solid streams wen collected and analyzed for each run. The HAPS measured included 13 trace metals, HCI, and HF. This teport presents all field data and laboratory analysis results. Mass balances, removal efficiencies, and emission factors for HAPs also ate presented.