Research progress on the key influencing factors of spontaneous combustion of coal gangue and control methods
Spontaneous combustion phenomenon of coal gangue as an associated product of coal is frequent in the process of long-term stockpiling,which directly or indirectly produces ecological pollution,water pollution,geological disasters and many other problems,re-sulting in huge economic losses and human casualties.Coal gangue is a complex physical and chemical reaction process that is influenced by many factors,including its own properties,self ignition conditions,and external environment,from the initial stage of accumulation to the combustion state.In order to improve the prevention and control of spontaneous combustion of gangue in mining areas,the research status of the spontaneous combustion theory of coal gangue was analyzed.The research progress of scholars at home and abroad on the mechanism of spontaneous combustion of coal gangue and governance methods at this stage was systematically summarized.The main key influencing factors and process mechanisms that trigger spontaneous combustion were presented focusing on three necessary fac-tors affecting the spontaneous combustion of gangue,combustibles,oxygen,and temperature.A more comprehensive introduction was giv-en to the main methods of prevention and control of spontaneous combustion in existing gangue mountains.The advantages and disadvanta-ges of self ignition fire extinguishing methods of various conventional coal gangue and treatment technologies were compared and analyzed.The limitations of the effectiveness of conventional techniques for treatment were pointed out.The land remediation and ecological restora-tion are disposed of in response to coal gangue replacing sand and stone materials for backfilling areas such as open pits and coal mining subsidence areas.It is proposed to identify the control targets for spontaneous combustion management in the prevention and treatment process,enhancement of specific properties of fire protection materials,intelligent equipment to improve the accuracy of identification of fine monitoring,and the use of a variety of monitoring and early warning technology synergistic spontaneous combustion prevention and control materials.The future development of coal gangue spontaneous combustion prevention and control technology,the research di-rection of mining fireproofing materials were proposed,providing reference and theoretical support for the subsequent research on the mechanism of spontaneous combustion of coal gangue and the application of spontaneous combustion control engineering.
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维普
