||Bench-Scale Evaluation of Calcium Sorbents for Acid Gas Emission Control.
Jozewicz, W. ;
Chang, J. C. S. ;
Sedman, C. B. ;
||Acurex Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Air pollution control ;
Flue gases ;
Calcium hydroxides ;
Performance evaluation ;
Fabric filters ;
Baseline measurements ;
Sulfur dioxide ;
Hydrochloric acid ;
Nitrogen oxide(NO) ;
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||The paper gives results of an evaluation of calcium sorbents for acid gas emission control for effectiveness in removing SO2/HCl and SO2/NOx from simulated incinerator and boiler flue gases. All tests were conducted in a bench-scale fixed-bed reactor simulating fabric filter conditions in an acid gas removal process. Reagent grade Ca(OH)2 was used to establish baseline sorbent performance. The reactivity of reagent grade Ca(OH)2 with HCl from SO2/HCl mixtures gradually increased with decreasing approach to saturation temperature. SO2 reactivity toward Ca(OH)2 was very sensitive to approach to saturation. Novel calcium silicate sorbents were tested for reactivity with both SO2 and HCl. A thermal window for optimum NOx removal was found at 90 C when Ca(OH)2 was used at SO2/NO ratios of 1:1. Reactivity of Ca(OH)2 toward SO2 from SO2/NO mixtures was very sensitive to approach to saturation, while reactivity with NO was insensitive. Several additives were subsequently tested to determine optimum sorbent combinations for SO2/NO control. To date, the most promising additives are Mg(OH)2 and Na2HPO4 at 10 mol % concentrations. As with SO2/HCl, calcium silicate has been shown to be superior for SO2/NO capture. Some implications for larger-scale process configurations and sorbent selection for HCl/SO2/NO control are discussed.
||Pub. in Environmental Progress, v9 n3 p137-142 Aug 90. See also PB89-221352. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
|NTIS Title Notes
||Journal article Oct 88-Mar 89.
||Reprint: Bench-Scale Evaluation of Calcium Sorbents for Acid Gas Emission Control.
||PC A02/MF A01