我国部分煤矿正常生产期间，在工作面无明显自然发火征兆的情况下，上隅角常伴有高浓度CO积聚现象，干扰煤自燃监测预警，给矿井安全生产带来了困难。本文以灵新煤矿15#煤层061501工作面为研究对象，对工作面上隅角CO积聚规律和治理技术进行研究，以保障工作面安全生产。具体研究结果如下：

利用元素分析和红外光谱分析，确定了煤表面易氧化活性官能团种类；通过煤氧化实验分析，在常温（20℃）条件下煤可以持续氧化产生CO，得出了不同氧浓度、粒径对CO产生规律的影响，发现了升温条件下CO产生变化分为3个阶段，每个阶段主要受温度与氧浓度的共同作用。

基于现场观测得出，采空区CO主要集中在回风侧，呈现“凸”字型变化趋势；工作面CO浓度变化由进风侧至回风侧上隅角呈指数增长，沿工作面倾向CO浓度分布由大至小为架间>通道>煤壁。由于密度差异导致的自然升力，上隅角CO浓度主要呈上、中、下依次递减分布。结合实测数据与理论分析，确定出采空区遗煤氧化产生CO为工作面上隅角CO主要来源。

通过数值模拟软件建立了工作面CO运移积聚模型，得出了工作面CO运移规律，分析了工作面CO浓度场和风流场的分布规律，确定了低速涡流区域是造成工作面上隅角高浓度CO积聚的原因，并得到了增大工作面风量对改善上隅角低速涡流区域的CO效果不明显。

基于上述研究，针对工作面上隅角低速涡流区域，提出了上隅角CO引射治理技术。通过数值模拟分析了采用引射器前后上隅角CO浓度场与风流场的变化情况，并通过现场试验进一步验证治理效果。结果表明，该治理方法能够破坏上隅角处低速涡流区域，有效减小上隅角CO积聚区域浓度，起到了良好的CO治理效果。

During the normal production period of some coal mines in China, there is often a phenomenon of high concentration CO accumulation in the upper corner without obvious signs of spontaneous combustion in the mining face, which interferes with the monitoring and warning of coal spontaneous combustion and brings difficulties to the safety production of mines. This article takes the 061501 mining face of the 15# coal seam in Lingxin Coal Mine as the research object, and studies the accumulation law and control technology of CO in the upper corner of the working face to ensure safe production of the working face. The specific research results are as follows:

By using elemental analysis and infrared spectroscopy analysis, the types of easily oxidized active functional groups on the coal surface were determined; Through the analysis of coal oxidation experiments, it was found that coal can continuously oxidize to produce CO at room temperature (20℃). The effects of different oxygen concentrations and particle sizes on the production of CO were obtained. It was found that the changes in CO production under heating conditions can be divided into three stages, and each stage is mainly affected by the co effect of temperature and oxygen concentration.

Based on on-site observations, it is found that CO in the goaf is mainly concentrated on the return air side, showing a "convex" shaped change trend; The variation of CO concentration in the mining face increases exponential growth from the air inlet side to the upper corner of the air return side, and the distribution of CO concentration along the mining face incline from high to low is inter rack>passage>coal wall. Due to the natural lift caused by density differences, the CO concentration in the upper corner mainly shows a decreasing distribution in ascending, middle, and descending order. Based on measured data and theoretical analysis, it has been determined that CO generated by the oxidation of residual coal in the goaf is the main source of CO in the upper corner of the mining face.

A model for CO migration and accumulation in the mining face was established through numerical simulation software, and the law of CO migration in the mining face was obtained. The distribution law of CO concentration field and airflow field in the mining face was analyzed. It was determined that the low-speed eddy current area was the cause of high concentration CO accumulation in the upper corner of the mining face. It was also found that increasing the air volume in the mining face did not have a significant effect on improving the CO concentration in the low-speed eddy current area in the upper corner.

Based on the above research, CO injection treatment technology is proposed for the low-speed eddy current area at the upper corner of the mining face. The variation of CO concentration field and airflow field in the upper corner before and after the use of an injector was analyzed through numerical simulation, and the governance effect was further verified through on-site experiments. The results show that this governance method can destroy the low-speed eddy current area at the upper corner, effectively reduce the concentration of CO accumulation in the upper corner, and achieve good CO control effect.