The influence of
prepyrolysis temperatures on the spontaneous combustion
of wetting coal remains unclear from a macroscopic perspective. To
this end, a low-ash and high-volatile wetting coal sample from Western
China was pretreated by a programmed heating experimental system at
isothermal pyrolysis temperatures of 50, 80, 110, 140, and 170 °C
under nitrogen atmosphere and then cooled to room temperature; after
that, the oxidation heating experiment was carried out within the
range of 30–170 °C. The results indicated that, when the
wetting coal samples were subjected to isothermal pyrolysis experiments,
the concentrations of CO and CO2 gradually decreased with
the prepyrolysis time, during which the cumulative value of CO increased
with the prepyrolysis temperatures, while the change trend of CO2 is first increased, then decreased, and then increased. In
terms of the oxidative heating experiment, the CO concentration of
prepyrolyzed coal samples was higher than that of raw coal before
70 °C and then gradually lower than that of the raw coal with
the increasing temperature. The CO2 concentration of coal
samples with prepyrolysis temperature of 170 °C is significantly
lower than that of other coal samples. According to the characteristic
parameters of CO and CO2 concentrations, oxygen consumption
rate, and exothermic intensity, it is inferred that the coal sample
with a prepyrolysis temperature of 140 °C exhibited the highest
spontaneous combustibility. The experimental results have a certain
guiding role for the safe mining of coal seam and the prevention and
control on spontaneous combustion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.