Abstract
To control the gas accumulation and spontaneous combustion in goafs of coal mines, many measures such as airflow volume at the working face, gas extraction, and nitrogen injection in goafs have been taken. However, the principles of these measures contradict when controlling two hazards simultaneously. It is necessary to understand how the flow field in goafs is influenced by these measures. In this study, a mathematical model of the flow field in a goaf behind a u-type mechanized working face is established using the theory of porous media. The flow field in a goaf with the risk of gas accidents and spontaneous combustion was analyzed for different controlling measures. Taking the Daxing coal mine in Liaoning Province as an example, the main parameters, such as airflow volume, gas extraction, and nitrogen injection, were optimized based on the simulation results. These results are of great significance for the coupled control of gas accumulation and spontaneous combustion in goafs of coal mines.
Highlights
Disasters with gas accumulation and fire coupled together in goafs can occur1–3 because of poor handling of the relationship between fire prevention and gas disasters, which is a prerequisite for preventing goaf disasters
An investigation of the coupled control of gas accumulation and spontaneous combustion in goafs of coal mines is of great importance and could provide a theoretical basis and technical support for controlling gas disasters and spontaneous combustion in coal mines
The gas concentration distribution in the goaf was obtained under different airflow conditions of 300 m3/min, 400 m3/min, 500 m3/min, 600 m3/min, 700 m3/min, 800 m3/min, 1000 m3/min, 1200 m3/min, 1400 m3/min, 1500 m3/min, 1600 m3/min, 1800 m3/min, 2000 m3/min, 2400 m3/min, 2800 m3/min, and 3000 m3/min
Summary
Disasters with gas accumulation and fire coupled together in goafs can occur because of poor handling of the relationship between fire prevention and gas disasters, which is a prerequisite for preventing goaf disasters. A high caving space in thick coal seams is created by fully mechanized caving mining, resulting in more coal left in the goaf. The goaf is subject to the dual pressure of spontaneous combustion and gas accidents. These scientific and effective methods for controlling spontaneous combustion and gas disasters in a goaf still lack theoretical guidance.. An investigation of the coupled control of gas accumulation and spontaneous combustion in goafs of coal mines is of great importance and could provide a theoretical basis and technical support for controlling gas disasters and spontaneous combustion in coal mines Scitation.org/journal/adv goaf have been proposed. these scientific and effective methods for controlling spontaneous combustion and gas disasters in a goaf still lack theoretical guidance. An investigation of the coupled control of gas accumulation and spontaneous combustion in goafs of coal mines is of great importance and could provide a theoretical basis and technical support for controlling gas disasters and spontaneous combustion in coal mines
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