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• W2013906610 endingPage "155" @default.
• W2013906610 startingPage "145" @default.
• W2013906610 abstract "A method to estimate thermal and kinetic parameters of Pittsburgh seam coal subject to thermal runaway is presented using the standard ASTM E 2021 hot surface ignition test apparatus. Parameters include thermal conductivity (k), activation energy (E), coupled term (QA) of heat of reaction (Q) and pre-exponential factor (A) which are required, but rarely known input values to determine the thermal runaway propensity of a dust material. Four different dust layer thicknesses: 6.4, 12.7, 19.1 and 25.4mm, are tested, and among them, a single steady state dust layer temperature profile of 12.7 mm thick dust layer is used to estimate k, E and QA. k is calculated by equating heat flux from the hot surface layer and heat loss rate on the boundary assuming negligible heat generation in the coal dust layer at a low hot surface temperature. E and QA are calculated by optimizing a numerically estimated steady state dust layer temperature distribution to the experimentally obtained temperature profile of a 12.7 mm thick dust layer. Two unknowns, E and QA, are reduced to one from the correlation of E and QA obtained at criticality of thermal runaway. The estimated k is 0.1 W/mK matching the previously reported value. E ranges from 61.7 to 83.1 kJ/mol, and the corresponding QA ranges from 1.7 x 10(9) to 4.8 x 10(11)J/kg s. The mean values of E (72.4 kJ/mol) and QA (2.8 x 10(10)J/kg s) are used to predict the critical hot surface temperatures for other thicknesses, and good agreement is observed between measured and experimental values. Also, the estimated E and QA ranges match the corresponding ranges calculated from the multiple tests method and values reported in previous research." @default.
• W2013906610 created "2016-06-24" @default.
• W2013906610 creator A5007226835 @default.
• W2013906610 creator A5071094309 @default.
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• W2013906610 date "2009-08-30" @default.
• W2013906610 modified "2023-09-30" @default.
• W2013906610 title "A means to estimate thermal and kinetic parameters of coal dust layer from hot surface ignition tests" @default.
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• W2013906610 doi "https://doi.org/10.1016/j.jhazmat.2009.02.010" @default.
• W2013906610 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19307057" @default.
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