Research On Natural Gas Long Distance Transportation Pipelines Steady And Transient Calculation And Load Forecasting

In recent years,the consumption of natural gas in Shannxi Province has increased rapidly. New problems must befaced by the natural gas corporation. They should rebuild the old pipelines and build new pipelines. On the other hand they should ensure the normal gas consumption and keep the pipelines operate economicly. To accomplish this work the natural gas corporation need the assistance of related computer software. In China the study of this kind of software is underway and the universal pipelines analysis software has arised for a long time abroad whose function is very powerful. At the same time it is difficult to introduce the foreign software into our country and need a great deal of capital, long training period and difficult maintenance.This thesis consults with many internal and overseas references. By the research of the pipelines system analysis theory including steady calculation theory,transient calculation theory and load forecast theory,the problems of the existing methods are exposed when it is used in the high pressure and long distance transportation pipelines. These problems can decline the calculation precision and speed. The existing methods have been improved from the following three aspects.(1) In the aspect of steady calculation,the problem that complexity of steady-state flow equations results in calculation speed decreasing is resolved by using the pipeline friction loss minimization principle to the initial pressure value distribution to avoid the initial value limitation of Newton Iterative Algorithm.(2) In the aspect of transient calculation,the problem that the high flow speed of natural gas...