矿井水酸碱度对遗煤氧化的影响及微观作用特性  

The effect of mine water pH on residual coal oxidation and its microscopic action characteristics

作　　者：潘荣锟[1,2,3] 汪志国 胡代民 袁纪为 PAN Rongkun;WANG Zhiguo;HU Daimin;YUAN Jiwei(School of Safety Science&Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454000,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Jiaozuo 454000,China)

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000 [2]煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454000 [3]河南省瓦斯地质与瓦斯治理重点实验室一省部共建国家重点实验室培育基地,河南焦作454000

出　　处：《煤矿安全》2024年第11期19-27,共9页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(52174169);河南省杰出青年基金资助项目(232300421015);河南省高校科技创新团队资助项目(24IRTSTHN018)。

摘　　要：为研究矿井水酸碱度(pH值)对采空区遗煤自燃特性的影响,采用平顶山煤矿的长焰煤,通过C600高精度微量热仪和气相色谱仪联用,分析低温氧化阶段衍生气体产气规律和热流曲线,并基于实验结果讨论其中的微观机理。研究结果表明:酸性水溶液浸泡显著促进了煤的氧化性能,且酸性越强,影响越大;碱性水溶液浸泡抑制了煤样的氧化性能;根据推断,认为可能是酸性溶液与煤中的矿物质反应,造成煤的孔隙率增大,促进了煤自燃反应的进程;而碱性溶液与煤样反应产生了沉积物,在一定程度上抑制了煤自燃反应。In order to study the effect of pH value of mine water on the spontaneous combustion characteristics of residual coal in goaf,long-flame coal from Pingdingshan Coal Mine was used to analyze the gas production law and heat flow curves of gas derived from low-temperature oxidation stage by using C600 high-precision microcalorimeter and gas chromatograph.Based on the experimental results,the microscopic mechanism was discussed.The results show that soaking in acidic aqueous solution significantly promotes the oxidation property of coal,and the higher the acidity,the greater the impact,while the soaking in alkaline aqueous solution inhibits the oxidation property of coal sample.It is concluded that the reaction between acid solution and minerals in coal may increase the porosity of coal and promote the process of spontaneous combustion of coal.The reaction of alkaline solution with coal sample produced sediment,which inhibited the spontaneous combustion reaction of coal to a certain extent.

关 键 词：矿井水酸碱度 采空区 水浸煤 热动力学 遗煤自燃 标志气体 

分 类 号：TD752.2[矿业工程—矿井通风与安全]