Y形通风采空区自燃与有害气体排放的数值模拟

基于非均质多孔介质漏风渗流方程、多相气体渗流-扩散方程和多孔介质渗流综合传热方程,建立了采空区瓦斯与自燃发火耦合数值模型,开发了用迎风格式有限元方法联立求解的计算机程序(简称G3).计算以图形方式给出各量的区域分布解,从理论上描绘了Y形通风采空区的漏风流态,动态描绘了瓦斯、氧和CO的体积分数以及温度分布状态及其变化过程,并证明了Y形通风形式能避免采空区瓦斯向工作面涌出.计算中采空区按冒落非均质介质处理,考虑了瓦斯涌出对自燃的耦合作用,给出了这种耦合作用关系和解决办法.Y形通风采煤的自燃,两者存在着顾此失彼的关系.

Numerical simulation of spontaneous combustion and maleficence gas drainage in goaf with Y-Type ventilation fashion

The paper aims to introduce the author's work on the numerical simulation of spontaneous combustion and maleficence gas drainage in goaf with y-type ventilation fashion.The present numerical simulation model is established based on the heterogeneous and porous medium seepage equation of air leakage,seepagediffusion equation of gas,such as gas,oxygen and carbon monoxide,as well as the synthesis heat transferring equation for seepage in porous medium.At the same time,upwind finite element method is also used to develop a computer program (G3) that can help to solve the model.After that,the district distribution solution for every variable is given as the graphics mode with the air leakage state of goaf described in theory with Y-type ventilation,which is proved to be favorable for preventing the gas effusion from goaf to the working face.In the process of simulation,goaf is treated as heterogeneous medium while the coupling effect of gas effusion to the spontaneous combustion has also been taken into consideration.And finally,it is necessary to point out that a great deal of air leakage in goaf with Y-type ventilation may contribute to the gas drainage,but the spontaneous combustion of remnant coal in goaf may resulted in.Therefore the relationship between the gas drainage and the spontaneous combustion of remnant coal in goaf can be said that: "One cannot attend to one thing without neglecting the other." The author has also given the coupling relationship and his solution to this complicated situation.