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AN ADIABATIC METHOD FOR STUDYING SPONTANEOUS HEATING OF COAL 1
Author(s) -
Davis J. D.,
Byrne J. F.
Publication year - 1924
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1924.tb18175.x
Subject(s) - adiabatic process , coal , spontaneous combustion , thermodynamics , calorimeter (particle physics) , autoignition temperature , ignition system , materials science , moisture , heat capacity , chemistry , analytical chemistry (journal) , composite material , organic chemistry , detector , electrical engineering , engineering , physics
An adiabatic calorimeter is described, by means of which the spontaneous heating characteristics of dry pulverized coal can be studied, so as to obtain a direct measure of the rate of spontaneous heating at different temperatures, uninfluenced by various heat interchange factors. Specimen time‐temperature curves of different coals are presented, which show approximately the same rate of heating over corresponding temperature ranges. From these curves, it is concluded that the main characteristic of spontaneous heating is that the rate of heating is an increasing function of the temperature. An empirical formula is developed, for which the constants, K, a and b , are determined for a Pittsburgh coal; θ= temperature, and T = time. From this formula, it is concluded: (1) no heating will take place below 26.27°C; (2) the time required for Pittsburgh coal to heat from this temperature to ignition is 144 hours, both the coal and the oxygen used being moisture free.