煤矿安全2026，Vol.57Issue(1)：45-55,11.DOI:10.13347/j.cnki.mkaq.20241217
含瓦斯环境下风干水浸贫瘦煤的自燃特性研究
Study on spontaneous combustion characteristics of air-dried water-soaked lean coal in a gas-containing environment
摘要
Abstract
To clarify the spontaneous combustion risk of residual coal under long-term water immersion and gas-containing airflow in underground mines and investigate the effects of dual water immersion and gas action on its spontaneous combustion characterist-ics,water-soaked coal samples were prepared by immersing partial coal samples in distilled water at a constant temperature of 30℃for 30 days.Programmed temperature rise experiments for coal spontaneous combustion,simultaneous thermal analysis,and in-frared spectroscopy were conducted to analyze the temperature-dependent variations in oxidation products,apparent activation en-ergy,and heat release intensity during the low-temperature oxidation process of air-dried raw coal and water-soaked coal under three gas volume fractions(0,1.5%,and 3%).Additionally,the evolution characteristics of functional groups after low-temperature oxida-tion.The results show that with the increase of gas volume fraction during low-temperature oxidation,the oxygen consumption rate,oxidation product generation rate,total heat release,and relative content of active functional groups of two coal samples gradually decrease,with more significant reductions observed in water-soaked coal compared to raw coal;the temperatures corresponding to the occurrence of C2H4,the achievement of thermal equilibrium,and the peak of heat flux all increase with the rise in gas volume fraction,Showing an obvious temperature hysteresis,and the increase in water-soaked coal is greater than that of raw coal;the activ-ation energy required for low-temperature oxidation increases progressively,with a larger increment in water-soaked coal.Under the same gas volume fraction,water-soaked coal demonstrates higher oxygen consumption rate,oxidation product generation rate,total heat release,and relative active functional group content than raw coal;the appearance of C2H4,thermal equilibrium,low-temperat-ure oxidation activation energy,and heat flux peak temperature are lower in water-soaked coal than in raw coal.Comprehensive ana-lysis reveals that water-soaked coal exhibits stronger spontaneous combustion tendency than raw coal,indicating that gas exerts a more stronger inhibitory effect on the oxidation of water-soaked lean coal at the same gas volume fraction.However,the promoting effect of water immersion on the spontaneous combustion of lean coal outweighs the inhibitory effect of gas on water-soaked coal.In environments with low gas volume fractions,water-soaked lean coal is more prone to oxidation and spontaneous combustion than raw coal.关键词
煤自燃特性/瓦斯/水浸煤/表观活化能/放热强度/官能团演化特征Key words
coal spontaneous combustion characteristic/gas/water-soaked coal/apparent activation energy/heat release intensity/functional groups evolution characteristic分类
矿业与冶金引用本文复制引用
王晓琰,年军,吕晓波,赵博,杜丽敏..含瓦斯环境下风干水浸贫瘦煤的自燃特性研究[J].煤矿安全,2026,57(1):45-55,11.基金项目
国家自然科学基金面上资助项目(52274220,52474244) （52274220,52474244）
山西省基础研究计划(自由探索类)青年资助项目(202203021212260) （自由探索类）
