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SILICA-ENHANCED SORBENTS FOR DRY INJECTION REMOVAL OF SO2 FROM FLUE GAS
Citation:
Jozewicz, W., J. Chang, C. Sedman, AND T. Brna. SILICA-ENHANCED SORBENTS FOR DRY INJECTION REMOVAL OF SO2 FROM FLUE GAS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-87/135.
Description:
The paper gives results of tests of novel silica-enhanced lime sorbents in a bench-scale sand-bed reactor for their potential for SO2 removal from flue gas. Reactor conditions were: 64 C, relative humidity 60% (corresponding to an approach to saturation temperature of 10C), and inlet SO2 concentration 500 or 1000 ppm. The sorbents were prepared by pressure hydration of CaO or Ca(OH)2 with siliceous materials at 100-230 C(101-2793 kPa) for from 15 min. to 4 h. The optimum temperature range for the pressure hydration of flyash with Ca(OH)2 was 110-160 C. The pressure hydration of diatomaceous earth with CaO did not offer significant reactivity advantages over atmospheric hydration; however, the rate of enhancement of Ca(OH)2 conversions was much faster with pressure hydration. SEM and x-ray diffraction studies showed solids of different morphology with different flyash/lime ratios and changing conditions of pressure hydration.