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Effects of catalytic mineral matter on CO/CO{sub 2} temperature and burning time for char combustion. Quarterly progress report No. 15 (Final report), October 1993--December 1993 [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
37 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
The high temperature oxidation of char is of interest in a number of applications in which coal must be burned in confined spaces including the conversion of oil-fired boilers to coal using coal-water slurries, the development of a new generation of pulverized-coal-fired cyclone burners, the injection of coal into the tuyeres of blast furnaces, the use of coal as a fuel in direct-fired gas turbines and in large-bore low-speed diesels, and entrained flow gasifiers. There is a need to understand the temperature history of char particles in conventional pulverized-coal-fired boilers to better explain the processes governing the formation of pollutants and the transformation of mineral matter. The temperature of char particle burning is the product of a strongly coupled balance between particle physical properties, heat and mass transfer, surface reaction, and CO/CO₂ ratio. Particle temperature has major effects not only on the burning rate but also on ash properties and mineral matter vaporization. Measurements of the temperature of individual burning char particles have clearly demonstrated large particle-to-particle temperature variations which depend strongly on particle size and on particle composition. This report consists of two major parts. In the first part, experimental measurements of CO/CO₂ ratio for a single spherocarb particle is presented along with a kinetic model which allows estimation of CO/CO₂ generated at a carbon surface for temperatures higher than those reported in the experimental work. In the second part, modeling of a temperature profile during a char combustion is reported, and also progress in modeling the complex sets of coupled phenomena involving full gas phase reaction kinetics, heat transfer, and mass transfer is summarized. In the appendix progress on construction and testing of an improved electrodynamic balance is presented.
Report Numbers
E 1.99:doe/pc/89774--t10
doe/pc/89774--t10
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/31/1993.
"doe/pc/89774--t10"
"DE94009130"
Lee, C.H.; Sarofim, A.F.; Longwell, J.P.
Type of Report and Period Covered Note
Quarterly; 10/01/1993 - 12/31/1993
Funding Information
FG22-89PC89774
View MARC record | catkey: 13838954