Numerical Simulation of Goaf Hot Blast on Coal Mining Face with High Temperature

For air conditioning of coal mines,consideration must be given to the temperature rise caused by the goaf hot blast.However,resuting from oxidation heat release,heat transfer of surrounding rock,etc.,goaf hot blast is influenced by many factors and involves complicated relations.Beginning with goaf heat source,the factors affecting goaf hot blast are thoroughly investigated.Adopting mass conservation law and Darcy's law,the differential equations of air flow in goaf were established;based on the heat transfer theory and energy conservation law,the differential equation of temperature field in goaf was built.After resolving the above equations by finite element method based on functional,a computer program with Visual Basic language was compiled;in consideration of different conditions in an actual mining face,the mitigation law of goaf blast under different ventilation resistance and primitive rock temperatures was derived,and at last,the analysis results were discussed.