Distribution law for the danger area for spontaneous coal combustion in a dynamic goaf with low air leakage speed
2020
This paper examines the relationship between the advancement of the working
face and the distribution of spontaneous coal combustion under a low air
leakage wind speed in a goaf. Based on the unsteady state simulation method,
the process of spontaneous coal combustion was simulated in a fully
mechanized coal mining face at different advancing speeds. The relationship
between different advancing speeds and the distribution area of the
oxidation zone of spontaneous coal combustion in a goaf was clarified. A
safe advancing speed was determined. Furthermore, the advancement of the
working face altered the area of spontaneous high temperature inside the
goaf. An increase in the advancing speed increased the length of time of
spontaneous combustion in the leftover coal. An exponential relationship was
demonstrated between the spontaneous combustion area and the advancement of
the fully mechanized mining face. When the oxygen concentration was used as
a calculation indicator, the width of the oxidation zone was asymmetrical on
the inlet and outlet, and the advancing distance of the working surface
increased when the distance was shorter than 90 m and the return side was
smaller than the inlet side. When the advancing distance was longer than 90
m, the width of the spontaneous combustion oxidation zone distribution
remained unchanged. The study clarified the relationship between the
distribution of the danger area for spontaneous coal combustion and
advancing speed. This could provide a theoretical basis for the prevention
and control technology of the spontaneous combustion of broken coal in a
dynamic goaf.
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