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.