The Simulation Research Of Gas Flow In Coal Seams

The law of gas flow in coal seam has practical meaning for the prevention of extrusion of coal and gas,improving the rate of gas drawed out and the exploitage and utilization of coal gas.The history of the law has had more than 40 years,it has formed several theories:the theory of linear permeation,the theory of diffusion,the theory of diffusion-permeation,the theory of nonlinear permeation,the function and effection of stress field,temperature field,electric field,and the theory of exceed flow of several coal seams.on the condition of certain supposition It has formed strict theory system and used coal mine safe production .but ,Because of the complex process of gas fow in coal seam,different theories have their different adaptable condition.On the basis of the research of formers ,anthor analysed the control equztion of following theories: the theory of linear permeation,the theory of diffusion,the theory of diffusion- permeation,the theory of first nonlinear permeation, the theory of second nonlinear permeation.On the basis of the method of finite difference,anthor make program(The program of Simulation of Gas Flow in Coal Seam) by the computer language of Visual C++,matcom and matlab.it can computer five kinds of modules of gas flow in coal seam .it has feiendly interface and conscision of drawing.On the conditions of laneway wall,working face ,boreholes, anthor simulated,analysed,compared the gas flow in coal seam using the five kinds of modules.The rate of permeation was devided into constant and variable in the simulation.The conclusions of the paper were that the difference and relation of the five modules of gas flow in coal seam.