Upper Corner Methane Concentration Distribution And Application On U-shaped Ventilation

This thesis combined with gas occurrence and flow characteristics of the high gas coal region 153 302 goaf in 15# 3 area in Gushuyuan coal mine in Jincheng Anthracite Mining Group, studies application of dynamics of fluids in porous media, heat and mass transfer, numerical simulations, and other theories, researches the pressure, velocity and concentration of gas in the goaf. Studies the distribution characteristics of goaf gas, the permeability coefficient of mined out area is proposed in elliptic distribution characteristics. Used with the laws of energy conservation, mass and momentum conservation, combines with the mining process, the basic parameters of 15# coal, concentration field in the goaf, wind conditions of the mining face, to establish the mathematical model of the gas flow. For gob shape and gas flow mathematical model, uses completely unstructured mesh finite volume method gob gas flow control equations and boundary conditions is discretized by using commercial CFD software Ansys Fluent of discrete computing. Deduced the formula of gas concentration in upper corner by mathematical formula, calculates that the gas concentration of 153 302 mining face will not be overrun in extraction period.Comparison with field data, the results of theoretical calculation and software simulation is well matched with the field measured data, further illustrates the correctness of the calculation formula of gas concentration in upper corner. Therefore, simulates and calculates with formula the scope of the gas concentration in upper corner in Gushuyuan coal mine, provides valuable experience in scientific and reasonable in gas control for the study about mining the same geological conditions, the same level of the same other mining working face.