Dynamic Analysis And Software Development Of Branched High-pressure Natural Gas Pipeline Network

Due to the fact that various parameters of the gas pipe network is changing all thetime, it is particularly important to hydraulic analysis under the dynamic condition of pipenetwork. Dynamic flow is comparatively complicated, normally need computer to solve it.This dissertation is based on the need to develop dendritic high-pressure natural gaspipeline network dynamic analysis software.This article first makes the requirement analysis about this non-functional simulatesubject, following by illustrating the analysis based on the core function. The form ofblock diagram is introduced in order to show the structure and the functional modules ofthis simulate system, furthermore, the man-machine dialogue interface of this system isdeveloped, in order to meet the data exchange between users and system.Using the graph theory knowledge as well as the generation method which based onthe node and pipeline connection matrix A, the network diagram can be expressed byinternet automatically. Users only need to input pipe number and associated pipe startnode, end node number, the pipe network can automatically generated.Taking advantage of the fluid continuity equation, momentum equation and stateequation as foundation, this dissertation set up accurate simulated pipeline model.According to the develop requirements of this system, the author proposed the simplifiedmethod of dynamic model and get the simplified mathematical model of dynamic analysis.According to the develop requirement of this simulation system, the initial andboundary conditions are formulated and the solving method is given. This articleintegrated applying initial conditions, boundary conditions, the basic gas flow dynamicequation model and difference scheme dynamic model, with the help of Newton Raphs-on technique, the nonlinear equations can be solved, the flow chart can be settled by thecalculation as well. Then set the dendritic pipeline network as an example, by comparing the data from this simulated system with the pipeline studio for gas tgnet software’s datewhich developed by the English ESI company, the accuracy and reliability of this systemcan be proved. Finally, the application of the simulated system in the pipeline gas peakshaving and SCADA system are discussed.