Research And Application Of Hydraulic Condition Simulation System Of Natural Gas Pipe Network

With the rapid development of China’s economy and urbanization,the gas pipe network system is crisscrossing and increasingly complex.It requires high safety,reliability and economy of the gas pipe network system.China’s urban gas pipe network system has generally the following characteristics,multi-gas source gas supply,branch pipe network and ring pipe network coexist,There’s a wide variety of pipes and pipe diameters.The pipelines were made in different years with a huge chronological span.They vary considerably in quality and differ in the degree of corrosion and aging.In recent years,the gas pipe network accident is frequent,and the main reason is that it can not accurately grasp the actual operation of the gas pipe network.The research is limited to the laboratory,which can not be applied to practice.Using pipe network simulation technology to study and analyze the hydraulic conditions and operating law of the pipe network system,can provide theoretical basis for the optimization design,operation scheduling,monitoring and early warning of the pipe network,which is of great practical significance to improve the reliability,stability and economic benefits of pipe network operation.Aiming at solving the above problems,this paper mainly does the following work: First,for the gas pipe network hydraulic calculation model analysis and comparison of the advantages and disadvantages of friction resistance calculation method,and through simulation and comparison experiments to verify;Second,the analysis and comparison of the Gold Segmentation Method,Analog Annealing Algorithm,basic Genetic Algorithm and improved Genetic Algorithm,focusing on the convergence speed and convergence accuracy of these algorithms,and by using the experimental results to verify,the improved genetic algorithm is more suitable for the use of natural gas hydraulic condition simulation system;Third,according to the finite element node method,using visual studio 2017 to compile the pipe network hydraulic calculation simulation system,based on the collected measured data,using the improved genetic algorithm to identify the Equivalent Roughness of the over-gas capacity coefficient,and thus better simulate the operation of the gas pipe network;Fourth,based on a city’s natural gas distribution network as a case,the network network hydraulic condition simulation simulation results show that: First,the total flow of the network network system of the simulation system can achieve balance,suitable for multi-ring,multi-gas source point,ring-shaped,branch pipe network hydraulic calculation,can effectively solve the problem of slow or non-convergence of gas pipe network calculation process,fast operation speed,less iterations,greatly improve the calculation accuracy and work efficiency;In this study,the theoretical and identification values of the Equivalent Roughness are used in the system for hydraulic calculation,and the results are compared with the measured values of the gas source plant and some nodes respectively,and the experimental results calculated according to the identification values are closer to the measured values than those calculated by the theoretical values,so the simulation of the hydraulic conditions of the pipe network is reasonable,the operation speed is fast and the operation effect is good.The research of this topic shows that the simulation and research of the hydraulic condition of the gas pipe network can provide a strong technical support for the optimal design,operation scheduling and monitoring and early warning of the pipe network.