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| Study on characteristics of spontaneous combustion in goaf based on non-uniform field |
| Liang Jianming |
| Xiagou Mine, Shanxi Xishan Jinxing Energy Corporation Ltd., Lvliang 033602, China |
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Abstract In order to study the natural ignition characteristics of “O” type compaction and non-uniform oxygen-consuming goaf, a numerical model of nonlinear seepage-multi-component gas-temperature field and non-uniform oxygen consumption in goaf was constructed. The model considered the dynamic changes of mine ventilation and working face propulsion; a model expression describing the compaction distribution of the roof rock strata according to the “O” ring was given; the grouting, pouring water and spraying inhibitor and local airflow made the oxygen consumption non-uniformity in the goaf, the non-uniformity of the oxygen-non-uniform 0-1 of the grouting-resisting agent was set up; the simulation calculation showed that although the local oxygen consumption fluctuated, the goaf oxygen consumption relieved after the implementation of the resistive measures, which proved that the temperature began to decrease, and the CO distribution area was significantly reduced. The simulation results were in line with the actual situation on site. The research indicated that the oxygen consumption non-uniformity model in the goaf could explain the abrupt and multi-variable factors affecting the spontaneous combustion temperature in the goaf. The results played an auxiliary role in the prevention and control of the residual coal in the mined goaf.
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