Activation and reactivity of novel calcium-based sorbents for dry SO2 control in boilers (journal article)

Technical Report · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5649629

Jozewicz, W; Kirchgessner, D A

Chemically modified Ca(OH)2 sorbents for SO2 control in utility boilers were tested in an electrically heated, bench-scale isothermal flow reactor, operated at between 700 and 1000 C and residence times of from 0.6 to 2 sec calculated from bulk gas flowrates. Novel surfactant-modified Ca(OH)2 (SM-Ca(OH)2) sorbents were compared to conventional Ca(OH)2 produced by dry hydration (DH-Ca(OH)2). Sorbents were activated in the flow reactor. The gas composition was 5 vol % oxygen with the balance nitrogen. Activated sorbents, SM-CaO and DH-CaO, were size classified with an inertial cascade impactor downstream of the flow reactor. The structure of each separated fraction (six trays plus preimpactor, D50 from 0.74 to > 11.9 micrometers) was characterized by nitrogen adsorption. For each size fraction measured, the surface area was higher for SM-CaO than for DH-CaO. The effect of thermal sintering was the increase of median pore size as a result of eliminating fine pores (below 100 A). Changes in the pore structure of Ca(OH)2 sorbents reacting with SO2 were also investigated. The effect of thermal sintering on pore structure of sorbents reacting with SO2 was eliminated. The degree of conversion was controlled by varying gas-phase mass transfer resistance (SO2 concentrations from 50 to 3000 ppm).

• Research Organization: Acurex Corp., Research Triangle Park, NC (United States)
• OSTI ID: 5649629
• Report Number(s): PB-91-177113/XAB; CNN: EPA-68-02-4701
• Resource Relation: Other Information: Pub. in Powder Technology 58, p221-229 1989. See also PB88-250212. Presented at the Annual Pittsburgh Coal Conference (5th) held in Pittsburgh, PA. on September 9-11, 1988. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
CALCIUM HYDROXIDES
SORPTIVE PROPERTIES
CALCIUM OXIDES
FLUE GAS
DESULFURIZATION
ACTIVATION ENERGY
ADSORBENTS
ADSORPTION
AIR POLLUTION CONTROL
BOILERS
CHEMICAL ACTIVATION
CHEMICAL PREPARATION
COAL
COMBUSTION
MASS TRANSFER
MICROSTRUCTURE
MODIFICATIONS
MORPHOLOGICAL CHANGES
NITROGEN
PARTICLE SIZE
POROSITY
SINTERING
SORTING
SULFIDATION
SULFUR DIOXIDE
SURFACE AREA
SURFACE PROPERTIES
TECHNOLOGY ASSESSMENT
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
ENERGY SOURCES
FABRICATION
FOSSIL FUELS
FUELS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
MATERIALS
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
SIZE
SORPTION
SULFUR COMPOUNDS
SULFUR OXIDES
SYNTHESIS
THERMOCHEMICAL PROCESSES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions