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Numerical Simulation of Fire Prevention and Control at Goaf of Fully Mechanized Top Coal Caving Workface in Inflammable Extra-thick Coal Seam of Gushan Mine

Author: BiBo
Tutor: ZhouXiHua
School: Liaoning Technical University
Course: Safety Technology and Engineering
Keywords: Caving coal goaf Nitrogen injection against fire Spontaneous combustion zone Numerical simulation
CLC: TD752.2
Type: Master's thesis
Year: 2011
Downloads: 76
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Abstract


The distribution of the velocity of air flow and oxygen concentration in working face and mined-out area are determined by numerically simulating the flow field. With the simulated results and measured data together, the spontaneous combustion dangerous zone of 065-2 working face in Gushan coal mine is divided into three zones. The calculated result of the smallest advancing velocity of working face is 110 meters Monthly. The impacts of changes of air flow and nitrogen injection flow on goaf oxidation zone are analyzed. When increasing air flow, Spontaneous combustion zone move to deep and goaf fire easily. When increasing nitrogen injection, goaf inerting very clear. And research the impact of break wall construction and hold coal in mining. That when building the break wall, Width of spontaneous combustion zone decreases. And the break wall under the same specifications, the break wall below of the effect of building is better than in the upper break wall of the effect. When holding coal in mining, the porosity decreased goaf .Width of spontaneous combustion zone decreases. The results has important guiding significance on work safety in Gushan coal mine and similar mines.

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CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine fire > Mine Fire > Internal fire and prevention
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