The Spontaneous Combustion of Coal With Special Reference to Bituminous Coals O

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The Spontaneous Combustion of Coal With Special Reference to Bituminous Coals O
Samuel Wilson Parr
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From these data, the total heat evolved from the pyritic oxidation does not seem im- portant when compared with the heat liberated by the absorption of oxygen, but it is to be remembered that the absorption of oxygen by coal is immensely accelerated at an increased temperature, and it seems very probable that the pyritic oxidation may be the means by which this temperature, favorable to active oxygen ab- sorption, is attained.
As has been shown by the work of Parr and Francis, 2 the temperature
... at which oxidation of the coal substance itself actu- ally begins (about 120 in oxygen and 135 in air) is compara- tively low, and therefore any influence which would serve as a force to bring the coal up to this temperature should be taken into account. Since coal is a rather poor conductor of heat the major part of the heat generated within the pile will be re- tained, and from the calculation of the heat generated by the py- ritic oxidation, it may be seen that a sufficient quantity of heat 1 Jour, of the Soc.

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