Silica-enhanced sorbents from dry injection removal of SO2 from flue gas

Conference · Thu Jan 01 04:00:00 EST 1987 · Proceedings, Annual Meeting, Air Pollution Control Association; (USA)

OSTI ID:5138987

Jozewicz, W; Chang, J C.S. ^[1]; Sedman, C B; Brna, T G ^[2]

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1. Acurex Corp., Research Triangle Park, NC (USA)
2. U.S. Environmental Protection Agency, Research Triangle Park, NC (US)

The authors describe silica-enhanced lime sorbents tested in a bench-scale sand-bed reactor for their potential for SO/sub 2/ removal from flue gas. Reactor conditions were 64{sup 0}C (147{sup 0}F), relative humidity of 60% (corresponding to an approach to saturation temperature of 10{sup 0}C (18{sup 0}F)), and inlet SO/sub 2/ concentration of 500 or 1000 ppm. The sorbents were prepared by pressure hydration of CaO or (OH){sub 2} with siliceous materials at 100{sup 0}C (101 kPa) (212{sup 0}F (14.7 psi)) to 230{sup 0}C (2793 kPa) (446{sup 0}F (405 psi)) for 15 min. to 4 h. Pressure hydration fostered the formation of a sorbent reactive with SO{sub 2} from flyash and Ca(OH)/sub 2/ in a much shorter time then did atmospheric hydration. The conversion of Ca(OH){sub 2} in the sand-bed reactor increased with the increasing weight ratio of flyash to lime and correlated well with B.E.T. surface area, increasing with increasing surface area.

• OSTI ID: 5138987
• Report Number(s): CONF-870695--
• Conference Information: Journal Name: Proceedings, Annual Meeting, Air Pollution Control Association; (USA) Journal Volume: 1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AEROSOL WASTES
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
ASHES
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
COHERENT SCATTERING
CONTROL
DESULFURIZATION
DIFFRACTION
ELECTRON MICROSCOPY
FLUE GAS
FLY ASH
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
LIME-LIMESTONE WET SCRUBBING PROCESSES
MICROSCOPY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
RESIDUES
SCANNING ELECTRON MICROSCOPY
SCATTERING
SCRUBBING
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORBENT RECOVERY SYSTEMS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES
X-RAY DIFFRACTION