Research And Practice On Hydraulic Simulation Of Urban Natural Gas Ppipeline Networks

With the rapid development of the natural gas, the scale of the construction ofnatural gas pipeline networks in China were growing more and more rapidly, and thesupervision of the city gas pipeline networks became more intelligent. The hydraulicconditions of the actual operations of the pipeline networks had were very importantimpact on the economy, security and stability for users. Therefore, it was very essentialto understanding and mastering the hydraulic conditions for monitoring, managing andregulation the condition of the entire pipeline networks, and it was also extremelyimportant to research the simulation of city gas pipeline networks.The precision of the traditional node method for steady-state simulation had beenunable to meet the needs of the actual operation of city gas pipeline networks. Therefore,in order to ensure the accuracy of the simulation results, the calculation procedures needhigher accuracy, and applicability of stronger data processing and parameter selectionmethod. Then, the appropriate dynamic simulation method has been selected throughcomparative and analysis, and the accuracy of the program results was verified.Today, the increasing demand for natural gas in the city was causing theconstruction of large-scale development of the pipeline networks, the pipeline networksstructures becoming increasingly complex, and the pressure getting higher and higher,even up to the ultra-high pressure. Since the simulation of the ultra-high pressurepipeline networks must consider the compressibility of gas in pipes. By comparingseveral compressions factor calculation methods, law of SHBWR equation state waschosed, and the same way of calculation the thermo dynamic parameters with SHBWRequation of state law.In addition, the multiple gas sources of natural gas construction was a trend ofdevelopment of pipeline networks, so analysing of the simulation of multiple gassources pipeline networks depending on the differences of situation of gas sources, andproposing to adopt a different approach. Then, through using the simulation to project ofthe hydraulic conditions in urban planning pipeline network, the applicability of futuregas source in the pipe network system were proposed and analyzed, and the impact ofeach of the main gas sources range of future pipeline networks running process was firstproposed, which was accurate and timely respond to a variety of conditions and toprovide the basis. Finally, according to the capacity of the source of the gas in the natural gas pipelinenetworks with multiple gas sources and hydraulic pipe flow calculation results, youcould determine the various gas sources in each pipe section and composition of eachnode, and also provide the theoretical basis and data support for the operation of the gassupply management and the formulation of the gas price.This subject of research shows that the simulation program can be applied not onlyin using pipeline network systems simulation, analysing the running pipe networkshydraulic conditions, and can be also applied to the pipeline network which wasplanning. Analysing of the results of the operating conditions of the pipe network,guiding the designing and planning of the gas pipeline network to optimize theoperation and regulation management has obvious practical value, with the applicabilitystudy has been certain to guide significance for midstream gas supply mode anddownstream gas.