Prediction of spontaneous combustion"three zones"in goaf based on PFC-CFD
Spontaneous combustion of residual coal in goaf is one of the main causes of coal mine fire,and most of them occur in the oxidation zone of spontaneous combustion"three zones"in goaf.In order to accurately predict and divide the spontaneous combustion"three zones"in the goaf to prevent mine fires,a particle flow code-computational fluid dynamics(PFC-CFD)goaf flow field evolution model was proposed.First,the PFC particle flow simulation software was used to obtain the caving and porosity distribution of the overlying rock in the goaf.Then,the UDF function was used to compile the extracted porosity distribution data into CFD and the oxygen flow field in the goaf was simulated and predicted by establishing the physical model of the goaf.The"three zones"range of spontaneous combustion in the goaf was finally obtained.The results show that the prediction results of spontaneous combustion"three zones"in goaf based on PFC-CFD are basically consistent with the field measurement results,which are better than the prediction results of single CFD method.The study indicates that the method of using the dynamic evolution of porosity to analyze the change of flow field in goaf so as to identify the dangerous area of spontaneous combustion of residual coal is reliable and has certain theoretical guidance and practical application significance for preventing spontaneous combustion in goaf.
spontaneous combustion of residual coalporositynumerical simulationspontaneous combustion"three-zones"predictiongoaf
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