To explore the problem of CO concentration overrun in fully mechanized caving faces, a multiphysical field coupling model of CO emission regularity was established in this study based on the gas flow theory, gas concentration field theory, and heat transfer theory. Taking the 014N1⁻¹ working face of the No. 1 coal seam in Ruian coal mine as the research object, the model was applied to simulate the CO concentration in the fully mechanized caving face. The simulation results were found to be consistent with the field detection results. Based on the simulation results, the effects of advancing speed and wind velocity on the CO emissions in the gob and the CO concentration distribution in the working face were analyzed. The results showed that, the lower the wind velocity, the greater the CO emissions. With increasing advancing speed, the CO emissions in the gob first increased, reached maximum, and then decreased. The production conditions were found to be most suitable when the advancing speed and wind velocity were 2 and 1.8 m/s, respectively. Moreover, the CO emission characteristics of the fully mechanized caving face under the conditions of periodic roof weighting, production process, and atmospheric pressure change were monitored and analyzed. We verified the presence of CO in the coal seam and its emission with the progress of coal seam mining. Our results will be useful in the research and analysis of CO emission source, emission regularity, and overrun warning in fully mechanized working faces.

中文翻译：

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综放工作面CO排放规律及其影响因素

针对综放工作面CO浓度超限问题，本研究基于气体流动理论、气体浓度场理论和传热理论，建立了CO排放规律的多物理场耦合模型。取 014N1 ⁻¹以瑞安煤矿1号煤层工作面为研究对象，应用该模型模拟综放工作面CO浓度。仿真结果与现场检测结果一致。基于模拟结果，分析了前进速度和风速对采空区CO排放和工作面CO浓度分布的影响。结果表明，风速越低，二氧化碳排放量越大。随着推进速度的增加，采空区的CO排放量先增加，达到最大值，然后减少。当推进速度和风速分别为2和1.8 m/s时，发现生产条件最合适。而且，对综放工作面在周期性顶板配重、生产过程和大气压力变化条件下的CO排放特征进行监测和分析。随着煤层开采的进展，我们验证了煤层中CO的存在及其排放。研究结果对综采工作面CO排放源、排放规律及超限预警的研究和分析具有重要意义。