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Approximations to activity surfaces for slags in potassium-seeded coal flames

Author
Spencer, Jr, F. E.
Published
United States : [publisher not identified], 1974
Springfield, Va.: National Technical Information Service, [approximately 1974]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Bienstock, D. and Hendrie, Jr, J. C.

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Summary
Logarithms of approximate activity coefficient surfaces are calculated for K/sub 2/O-SiO/sub 2/-Al/sub 2/O/sub 3/ solutions as cubic polynomial functions of two independent composition variables. The polynomials are constrained to satisfy the Gibbs-Duhem equation. Data used include newly prepared tables for kaliophilite, leucite, and microcline liquids, as well as recent potassium pressure measurements made by the National Bureau of Standards. Results are given for equilibrium potassium loss percentages in certain typical coal-fired MHD regimes: 90%, 100%, and 110% simple oxygen ratios; 100%, 50%, 20% and 6% ash carryover; temperatures 2200 (-100) 1500 kelvins. Comparisons are given with the authors' (previous) ideal solution model, as is a discussion of its shortcomings. Seed loss into coal slag has received a justified amount of recent attention within the MHD community. When complete and accurate thermodynamic data become available, it will then become possible to make meaningful computer predictions about this important problem using the methods of this presentation.
Report Numbers
DE83008576; CONF-7411121-2
Other Subject(s)
Collection
NTIS collection.
Note
OSTI Identifier 6319018
Research organization: Bureau of Mines, Pittsburgh, PA (USA). Energy Research Center.
View MARC record | catkey: 47328330