Study on Simulation Technology of Coal Bed Methane Transmission Pipeline

In view of the characteristics of coal bed methane, equation of state BWRS is used to calculate the thermodynamic parameters. Then based on continuity equation, momentum equation, characteristic equations of non-pipe elements and flow quantity balance equation, the simulation mathematic model of coal bed methane transmission pipeline is built. Considering the slow transient characteristic of gas flowing, the implicit central difference method is used to transform partial differential equations of the model into finite difference equations. Aiming at non-linear characteristics of differential equations, Newton iteration format is constructed and the model´s solution method is discussed. Finally, MS Visual C++ is utilized to develop a simulation program of coal bed methane transmission pipeline, and the practical application is carried out. The results show the mathematic model built in the paper and its solving method are both feasible. They provide technical supports for reasonable design and operation of the coal bed methane pipelines.