Investigation of coupled control of gas accumulation and spontaneous combustion in the goaf of coal mine

• Main Authors: Ke Gao, Zhipeng Qi, Jinzhang Jia, Shengnan Li, Zeyi Liu, Zimeng Liu
• Format: Article
• Language: English
• Published: AIP Publishing LLC 2020-04-01
• Series: AIP Advances
• Online Access: http://dx.doi.org/10.1063/5.0004243

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.