瓦斯泄压过程中的焦耳-汤姆逊效应

摘要

According to the safety problems occurred in the operation of the engineering system during the swelling thermodynamic process of the gas throttle,an experiment and theoretical study was conducted on the Joule-Thomson effect of the temperature-pressure during the gas pressure released process.A theoretical prediction was conducted on the gas temperature rising law at the pressure released outlet during the coal and gas outburst process.The study results showed that,due to the throttle effect of the gas pressure released,the temperature of the pressure released gas would be rapidly increased.When the gas pressure in the gas filling tank was more closely to the gas pressure in the pressure released tank,the gas temperature in the pressure released tank would be slowly increased.In the improved Berthelot state equation,the gravity temperature index n of the methane should be selected as 0.625.With the theoretical calculation of the Joule-Thomson effect,the internal temperature variation law of the pressure released tank obtained during the gas pressure released process was basically the same to the measured results.Thus when the theoretical predicted coal and gas pressure as well as the gas pressure was 0.5,0.74 and 1.0 MPa individually,the gas temperature at the pressure released outlet would be increased to 22.99,33.87 and 45.35 K individually.%针对气体节流膨胀热力过程在工程系统运行中的安全问题,对瓦斯泄压过程温度-压力的焦耳-汤姆逊效应进行了试验和理论研究,并理论预测了煤与瓦斯突出过程中泄压口气体升温规律.研究结果表明:由于瓦斯泄压节流效应,泄压气体温度迅速升高,充气罐内瓦斯压力越接近泄压罐内瓦斯压力,泄压罐内气体温度升高越慢.在改进Berthelot状态方程中甲烷的引力项温度指数n取值0.625为佳.采用焦耳-汤姆逊效应理论计算得到的瓦斯泄压过程泄压罐内温度变化规律与实测结果基本一致,进而理论预测煤与瓦斯突出且瓦斯压力为0.5、0.74、1.0 MPa时,泄压口气体温度分别升高22.99、33.87、45.35 K.