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.