Causes and detection of coalfield fires, control techniques, and heat energy recovery: A review

He-tao Su^1,2,3，Fu-bao Zhou²，Bo-bo Shi²，Hai-ning Qi²，Jin-chang Deng²

1. School of Engineering and Technology, China University of Geosciences (Beijing)2. Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education3. Key Laboratory of Deep Geo Drilling Technology, Ministry of Natural Resources, China University of Geosciences (Beijing)

摘 要：Coalfield fires are considered a global crisis that contributes significantly to environmental destruction and loss of coal resources and poses a serious threat to human safety and health. In this paper, research related to the initiation, development, and evolution of coalfield fires is reviewed. The existing detection and control techniques of coalfield fires are also reviewed. Traditional firefighting is associated with waste of resources, potential risks of recrudescence, potential safety hazards, extensive and expensive engineering works, and power shortages. Recently,coalfield fires have been recognized as having significant potential for energy conservation and heat energy recovery. Thermoelectric power generation is regarded as a suitable technology for the utilization of heat from coalfield fires. The extraction of heat from coalfield fires can also control coalfield fires and prevent reignition leading to combustion. Technologies for absorbing heat from burning coal and overlying rocks are also analyzed. In addition, the control mode of "three-region linkage" is proposed to improve firefighting efficiency. Integrating heat energy recovery with firefighting is an innovative method to control coalfield fires.

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