Spatio-temporal evolution law of gas-temperature coupling field in “110 method” goaf and prevention of spontaneous combustion

• Published in: PloS one Vol. 18; no. 11; p. e0293829
• Main Authors: Wei, Song, Fang, Zhenqing, Li, Zongxiang, Liu, Yu, Hu, Dongjie, Miao, Chuntong, Wang, Haiwen
• Format: Journal Article
• Language: English
• Published: San Francisco Public Library of Science 20.11.2023; Public Library of Science (PLoS)
• Subjects: Air flow; Air leakage; Air temperature; Analysis; Bituminous coal; Coal; Coal industry; Coal mines; Coal mining; Combustion; Deterrence; Evaluation; Experiments; Fire prevention; Gas fields; Management; Methods; Mine ventilation; Mineral industry; Mines and mineral resources; Mining accidents & safety; Mining industry; Occupational health and safety; Occupational safety; Oxidation; Oxidation resistance; Prevention; Safety and security measures; Simulation; Software; Spontaneous combustion; Tailgates; Temperature distribution; Thermogravimetric analysis; Ventilation; Work face; China
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0293829

To investigate the distribution characteristics of spontaneous combustion disaster (SCD) zones in the goaf of "110" mining method with U + L ventilation system and formulate corresponding fire prevention measures, enclosed coal oxidation experiments were carried out to measure the oxidation characteristics of Dongrong Coal Mine bituminous coal sample. A coupled 3DEC-CFD (3 dimensional Distinct Element Code) model was established. The 3D transient distribution characteristics of SCD zones in the "110" mining goaf under U+L ventilation condition were analyzed. Nitrogen injection in the tailgate was proposed for coal spontaneous combustion prevention. The results show that air leakage changed the distribution of oxygen and temperature fields in the "110" goaf, causing the region 20~60 m parallel to the retained roadway to remain in the oxidation zone for spontaneous combustion. As the working face advanced, the area change curve of SCD zones in the "110" goaf exhibited a "double inflection point" pattern. Eliminating the "retained roadway oxidation zone" can effectively reduce the spontaneous combustion risks in the "110" goaf and ensure mining safety. This study enriches the mechanisms of coal spontaneous combustion.