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- W70164656 abstract "A flow tube reactor for the study of the reactivity of pulverized coal under controlled conditions has been developed. The reactor system incorporates optical diagnostics as well as probe sampling techniques to measure the reactivity of coals with differing physical and chemical properties. The aim of the research is to provide fundamental data that can be used in the design and development of coal combustion systems. Two size ranges of pulverized Montana Rosebud and one size of Illinois No. 6 coal were burned in a 7.3% oxygen-containing Ar/N/sub 2/ atmosphere. Gas temperatures were between 1140 K and 1750 K. In addition several measurements were made of micropore volume using CO/sub 2/ adsorption at room temperature. Qualitative behavior of both coals at high gas temperatures is consistent with a two stage combustion mechanism: devolatilization followed by char burnout. Results for the low temperature cases are less easy to interpret. Despite the fact that both diffusion and heterogeneous chemical rates decrease with decreasing temperature, the reactivity rates in the low gas temperature environment are comparable to those in the high gas temperature. It is quite likely that devolatilization occurring over periods much longer than 20 msec contributes to this high reactivity. Physical and chemical measurements have been made on the raw and partially burned coal. Specific mircopore volume, specific internal surface area, particle size distribution, and chemical composition have been determined. No single measurement as yet explains the unexpectedly high reactivity rates for coals in the lower gas temperature environment." @default.
- W70164656 created "2016-06-24" @default.
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- W70164656 date "1982-05-01" @default.
- W70164656 modified "2023-09-23" @default.
- W70164656 title "Pulverized coal combustion. Semi-annual report, October 1, 1981-March 31, 1982" @default.
- W70164656 doi "https://doi.org/10.2172/5407609" @default.
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