Actions for Coal plasticity at high heating rates and temperatures. Ninth technical progress report second quarter, April 1, 1992--June 30, 1992 [electronic resource].

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Coal plasticity at high heating rates and temperatures. Ninth technical progress report second quarter, April 1, 1992--June 30, 1992 [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
16 pages : digital, PDF file
Additional Creators
Massachusetts Institute of Technology, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Effects of pressure, temperature, and coal type on coal plasticity were investigated. Seven coals, from the Argonne premium sample bank ranging from lignite to low volatile bituminous, were studied. Elevated pressures, up to 10 atm of helium, did not affect coal plasticity, but reducing pressure from atmosphere to vacuum resulted in diminished plasticity, i.e. a shorter plastic period and a higher minimum apparent viscosity. It is hypothesized that high pressure inhibits mass transport of metaplast to tar vapors, but also favors metaplast repolymerization into coke and char. Higher holding temperature decreased the coal plastic period. It is hypothesized that higher temperature increases mass transport of liquid metaplast to tar vapors and metaplast repolymerization to coke and char. Heating rate had essentially no effect on the individual softening temperatures of five different plastic coals. Possible explanations are that, depending on coal type, metaplast generation, by chemical bond breaking or physical melting, or both, is not strongly affected by heating rate. In particular, for medium and low volatile bituminous cools, there is evidence that generation of the metaplast responsible for initial softening involves largely chemical bond breaking as opposed to physical melting.
Report Numbers
E 1.99:fe-mit--89773-9
fe-mit--89773-9
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
09/01/1992.
"fe-mit--89773-9"
"DE93002947"
Howard, J.B.; Peters, W.A.; Gerjarusak, S.
Type of Report and Period Covered Note
Quarterly; 04/01/1992 - 06/30/1992
Funding Information
FG22-89PC89773
View MARC record | catkey: 13837723