Record Display for the EPA National Library Catalog

RECORD NUMBER: 33 OF 78

OLS Field Name OLS Field Data
Main Title Identification of CaSO4 Formed by Reaction of CaO and SO2 (Journal Article).
Author Gullett, B. K. ; Bruce, K. R. ;
CORP Author Acurex Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher c1989
Year Published 1989
Report Number EPA-68-02-4701; EPA/600/J-89/133;
Stock Number PB90-126129
Additional Subjects Air pollution control ; Chemical analysis ; Calcium sulfates ; X ray diffraction ; Sulfur dioxide ; Spectrum analysis ; Combustion products ; Boilers ; Performance evaluation ; Experimental design ; Sorbents ; Porosity ; Mathematical models ; Reprints ; Limestone injection ; Flue gas desulfurization ; Coal fired power plants
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB90-126129 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/10/1990
Collation 5p
Abstract
The injection of calcium-based sorbents into coal-fired boilers for reaction with, and reduction in the levels of, sulfur dioxide (SO2) in the flue gas has undergone considerable research and development. Significant effort has also been made in developing models for the overall reaction CaO + SO2 + 1/2 O2 <-> CaSO4 in order to better predict the effects of system and sorbent variables upon performance. The article discusses the XRD-determination of the identity of CaSO4, formed by the reaction between CaO and SO2, and the support of that determination by density measurements with helium pycnometry. The anhydrous CaSO4 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 SO2 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.