Development and pilot plant evaluation of silica-enhanced lime sorbents for dry flue gas desulfurization

Journal Article · Wed Jun 01 04:00:00 EDT 1988 · J. Air Pollut. Control Assoc.; (United States)

DOI:https://doi.org/10.1080/08940630.1988.10466420· OSTI ID:6757220

Jozewicz, W; Jorgensen, C; Chang, J C.S.; Sedman, C B; Brna, T G

EPA's efforts to develop low cost, retrofitable flue gas cleaning technology include the development of highly reactive sorbents. Recent work addressing lime enhancement and testing at the bench-scale followed by evaluation of the more promising sorbents in a pilot plant are discussed here. The conversion of Ca(OH)/sub 2/ with SO/sub 2/ increased several-fold compared with Ca(OH)/sub 2/ alone when Ca(OH)/sub 2/ was slurried with fly ash first and later exposed to SO/sub 2/ in a laboratory packed bed reactor. Ca(OH)/sub 2/ enhancement increased with the increased fly ash amount. Diatomaceous earths were very effective reactivity promoters of lime-based sorbents. Differential scanning calorimetry of the promoted sorbents revealed the formation of a new phase (calcium silicate hydrates) after hydration, which may be the basis for the observed improved SO/sub 2/ capture. Fly ash/lime and diatomaceous earth/lime sorbents were tested in a 100 m/sup 3//h pilot facility incorporating a gas humidifier, a sorbent duct injection system, and a baghouse. The inlet SO/sub 2/ concentration range was 1000-2500 ppm. With once-through dry sorbent injection into the humidified flue gas, the total SO/sub 2/ removal ranged from 50 to 90 percent for a stoichiometric ratio of 1 to 2. Recycling the collected solids resulted in a total lime utilization exceeding 80-90 percent. Increased lime utilization was also investigated by the use of additives.

• Research Organization: Acurex Corporation, Research Triangle Park, NC (USA)
• OSTI ID: 6757220
• Journal Information: J. Air Pollut. Control Assoc.; (United States), Journal Name: J. Air Pollut. Control Assoc.; (United States) Vol. 38:6; ISSN JPCAA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DESULFURIZATION
ECOLOGICAL CONCENTRATION
FLUE GAS
FUNCTIONAL MODELS
GASEOUS WASTES
MINERALS
NATIONAL ORGANIZATIONS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PACKED BED
PERFORMANCE TESTING
PILOT PLANTS
POLLUTION
REMOVAL
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORBENT RECOVERY SYSTEMS
SORPTIVE PROPERTIES
STOICHIOMETRY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
TESTING
US EPA
US ORGANIZATIONS
WASTES