Identification of CaSO sub 4 formed by reaction of CaO and SO sub 2 (journal article). Report for October 1988-March 1989

Technical Report · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5040484

Gullett, B K; Bruce, K R

The injection of calcium-based sorbents into coal-fired boilers for reaction with, and reduction in the levels of, sulfur dioxide (SO{sub 2}) in the flue gas has undergone considerable research and development. Significant effort has also been made in developing models for the overall reaction CaO + SO{sub 2} + 1/2 O{sub 2} <-> CaSO{sub 4} in order to better predict the effects of system and sorbent variables upon performance. This article discusses the XRD-determination of the identity of CaSO{sub 4}, formed by the reaction between CaO and SO{sub 2}, and the support of that determination by density measurements with helium pycnometry. The anhydrous CaSO{sub 4} compound formed has an orthorhombic crystal structure and an analytically calculated density of 2.98 g/cu cm, versus the JCPDS reported value of 2.995 g/cu cm. The product of the reaction, formed during calcium-based sorbent injection for SO{sub 2} removal from coal-fired power plants, has largely been assumed to have a density of 2.61 g/cu cm. Since reaction models must incorporate the product density in determining the rate of sorbent pore blockage or filling, correct identification of the reaction product is crucial.

• Research Organization: Acurex Corp., Research Triangle Park, NC (USA)
• OSTI ID: 5040484
• Report Number(s): PB-90-126129/XAB
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
&amp; Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas &amp; Particulate Emissions
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring &amp; Transport-- (1990-)
ADSORBENTS
AIR POLLUTION ABATEMENT
ALKALINE EARTH METAL COMPOUNDS
BOILERS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM SULFATES
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
COMBUSTION PRODUCTS
DESULFURIZATION
DIFFRACTION
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
LIMESTONE
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POLLUTION ABATEMENT
POROSITY
POWER PLANTS
ROCKS
SCATTERING
SEDIMENTARY ROCKS
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TESTING
THERMAL POWER PLANTS
WASTES
X-RAY DIFFRACTION