煤矿井筒防冻瓦斯-空气掺混技术研究

Research on gas-air mixing technology for anti-freezing in coal mine shaft

为降低抽采瓦斯中甲烷浓度,需要将瓦斯与空气掺混。针对冬季抽采瓦斯与冷空气直接掺混,会析出大量冷凝水,造成管道冻堵的问题,通过分析井筒防冻瓦斯-空气掺混技术进展,进行了两级掺混技术设计。实际应用案例表明:两级掺混技术可有效脱除瓦斯气中的液态水,降低瓦斯气露点温度,提高后端瓦斯利用设备的效率及系统运行安全性。

To reduce the methane concentration in gas,it was necessary to mix gas with air.If the gas was mixed with cold air in winter directly,a large amount of condensate would be precipitated from the gas due to the temperature decrease,and the condensate would further condense into ice and block the pipeline.By analyzing the progress of anti-freezing gas air mixing technology,a two-stage mixing technology design was carried out.Practical application had shown that the two-stage mixing technology could effectively remove the liquid water from gas,reduce the dew point temperature of gas,improve the efficiency of backend gas utilization equipment,and ensure the safety of system operation.