石炭の自然発火初期現象と石炭化度との関係

抄録

To investigate the relation between early stage of spontaneous combustion and rank of coal. We examined 15 coal samples and get next conclusions.
(1) The temperature difference generated by oxidation of coal.Δθ_p is expressed for the coal rank by the equation (1). Where, C is carbon contents %, and a is a constant.
Δθ_p=ae_-0.217·σ.(1)
(2) The logarithm of the amount of oxygen consumed, carbon dioxide production and carbon monoxide production varies linearly with the logarithm of the time of oxidation, or expressed mathematically as follows:
X=ct^b(2)
where X=amount of oxygen consumed, carbon dioxide production or carbon monoxide production, cc in the oxidation reaction t=time in oxidation apparatus, hrs
c, b=constants
(3) CO₂/O₂ and CO/O₂ vary independent of coal rank. At the early stage of spontaneous combustion, we can't presume coal temperature by CO₂/O₂ and/or CO/O₂.
(4)The coal temperature θ°K when rate of temperature rise amounts to a fixed value, is expressed for the coal rank by the equation (3):
1/θ=a-3.6·C×10^-5
Where C=C%, a=constant