Study On Three-dimensinal Simulation Of Spontaneous Combustion In Goaf With Fully Mechanized Caving Face

Numerical simulation methods have increasing application in coal mine spontaneous combustion control with its accuracy and practical. So it is very important to develop a new software program suiting for practical mining conditions. Based on law of conservation of mass, Fourier law, Darcy law, Fick law and law of conservation of mass, this dissertation has established three-dimensional spontaneous combustion mathematical model of goaf and made out its boundary conditions. Through a series of experiments, the dissertation gets the key parameters of spontaneous combustion model of goaf. Based on the idea of Finite Volume Method (FVM), this dissertation put forward a new arithmetic of FVM applied to three-dimensional heat conduction problems. This dissertation has choosed a new control volume different from before and deduced mathematical formula for this new arithmetic. It showes that they have multiple of the relationship compared the results of three-dimensional Finite Element Method with FVM. Discretization of spontaneous combustion mathematical model of goaf using the new FVM arithmetic can get some linear simultaneous equations. And then, the simulation software system of spontaneous combustion in three-dimensional goaf is presented by Visual Basic program language. The software have simulated the first working face of Tongxin coal mine and the distribution map of pressure, velocity of flow, temperature and oxygen density in goaf are displayed by aftertreatment software Tecplot10. The on-site observed result of goaf is completely coinciding with the simulation result. So this simulation software has very important application value in goaf.