The Research Of The Pipeline Self-adaptive Online Simulation Technology

Modern gas pipeline network has a series of features, such as multiple gas sources and users, long distance, big transmission capacity, high pressure, multiple compressor stations, uncertain gas flow and so on, that has brought great challenges to the operation and management. In order to protect the production and operation, especially in the important city and region, the technology of gas pipeline network simulation is useful for lots of fields in gas pipeline industry, such as plan and design, scheduling management, operation control, storage and adjustment, operation optimization, and failure analysis.The essence of pipeline network simulation is to reappearing the flow patterns and the operating parameters diversification in the gas pipeline, and the major standards to measure pipeline network simulation technology are simulation accuracy and speed. Current study is more likely to emphasize the system of operating parameters, but not the system of fluid properties and design parameters. Gas properties have a lot of methods to calculate, different methods will cause different deviation. Pipeline design parameters that always be the inputs of the simulation system has decisive influence to simulation results, but many parameters like pipe length and pipe high are difficult to be exactly measured, if regard their approximation as the system inputs will reduce the simulation accuracy. Slowly varying parameters like pipe diameter, roughness and overall heat transfer are other parameters that has influence to simulation results, if they are regarded as constant, the system results will be reduced, especially for the dynamic or online simulation.For the above-mentioned problems, in this paper, in order to optimize the simulation accuracy and speed. Conducted studies on gas properties forecast, according to 16 kinds of equations and 5 kinds of correction model, predicting and contrasting gas compressibility factor at different operating conditions with the experimental data, then obtain the algorithms preferred table that is divided by pressure, temperature and gas constituent. According to the applicability analysis of traditional pipe simulation technology, this paper focus on the simulation deviation that caused by design parameters and slowly varying parameters, and proposed the technology of pipeline self-adaptive simulation, then establish the self-adaptive simulation equations for steady and online simulation. Moreover, this paper analysis the impact of the traditional node pressure method to simulation speed, and establish split node pressure model for the multi-segment network, through case studies, the split node pressure method enables simulation speed increased by 30%.Based on the results of the study, independently developed software PZ1.0 applied to any network structure of natural gas pipeline network simulation, through applied PZ1.0 in different pipeline network in steady and online conditions, verified the applicability of PZ1.0’s technology of pipeline network simulation and self-adaptive simulation in complex ring and twiggy pipeline network, and the average relative deviation of PZ1.0 in pipeline network simulation is 1.5%, the average relative deviation of PZ1.0 in self-adaptive simulation is 0.15%.