Numerical Simulation Research Of Low-permeability Coal Seam Of Gas Drainage Boreholes Parameters In Jinping Mine

The gas in the process of coal mining is always a problem to coal mine safe production, and therefore study on gas in the mining process is an important part to assure safety production. Gas drainage is considered as the most effective measures for safety production, how to improve the extraction efficiency is the focus of the research at home and abroad. This thesis first from percolation theory, diffusion theory, fluid mechanics and Computational fluid mechanics are analyzed in theory, and then establish a hypothesis and simulation model do according to the actual situation, finally studied the gas drainage hole by numerical simulation. To analysis the drainage effect of different parameters on the production process, to provide a theoretical reference for the actual production operation.Xiang mine group build the gas drainage system because of gas restricts the production. This thesis collect data of gas drainage systems of 105 and 107 working face in Jinpin Mine 3# coal seam, established a two-dimensional porous medium model, simulated with FLUENT. To analysis influence scope of drainage boreholes under different diameter, different negative pressure and different permeability of coal seam. Comparing simulation results with the present stage extraction effects to evaluate and optimize the reasonable of the holes of the drainage systems and provide a reference for drainage planning future. To enhance the safety factor of production and provide more theoretical basis for safety production of coal mine.