导气管阻力特性对钻孔瓦斯涌出初速度的影响  

The influence of airway resistance on the initial velocity of gas emission from borehole

作　　者：高建良[1,2] 尚宾[1] 张学博[1] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454003 [2]河南省瓦斯地质与瓦斯治理重点实验室--省部共建国家重点实验室培育基地,河南焦作454003

出　　处：《煤炭学报》2011年第11期1869-1873,共5页Journal of China Coal Society

基　　金：2010年度高等学校博士学科点专项科研基金资助项目(20104116110001)

摘　　要：建立了瓦斯在煤层运移、向测量室涌出、测量室瓦斯压力变化、瓦斯沿导气管流出的数学模型。利用有限差分法解算了测量室动态压力边界条件下钻孔周围煤层瓦斯流动、得到测量室瓦斯压力变化及钻孔瓦斯流量随时间的变化规律。分析了导管阻力对钻孔瓦斯流量的影响。结果表明:导气管的长度、材质和管径不同时,测定的钻孔瓦斯流量最大值出现的时间、大小不同;导管管径对测定值的影响最大;导气管摩擦风阻越小,钻孔瓦斯流量越大,测得的瓦斯涌出初速度越大。The mathematical model of gas flow in the coal seam,gas flow into the measuring chamber,gas pressure change in the measuring chamber,and gas flow out of the chamber through the airway was established.Using the finite difference method,gas flow around borehole with measuring chamber was measured under dynamic boundary conditions.The variation rule of gas pressure in the measuring chamber and the gas flow quantity in borehole with time was obtained.The influence of airway resistance on initial velocity of gas emission from borehole was analyzed.Results show that when airway length,material and diameter is not the same,the maximum value and appear time of gas flow quantity is different.Airway diameter has great impacts on the value of gas flow in borehole.When the airway resistance is smaller,the gas flow quantity is bigger,and the initial velocity of gas emission from borehole is bigger too.

关 键 词：导气管 钻孔 瓦斯涌出初速度 测量室 瓦斯流量 

分 类 号：TD712.52[矿业工程—矿井通风与安全]