Research And Implementation On Simulation Engine Of Lagrge-Scale Gas Pipe Network

In recent ten years, the natural gas industry has entered into the phase of rapid development. And pipeline simulation technology has improved rapidly in our country. Though many academics studied the technologies in the field of oil&gas storage and transportation. any commerical pipeline simulation software that can apply to all topological structure of gas pipe network and dynamic simulation in complex hydraulic conditions did not developed sucessfully. The calculation and operation analysis of oil&gas pipeline still depend on foreign commerical simulation software (SPS, TGNET etc). There are some serials problem such as technological monopoly, unsatisfactory service and unenough expansibility etc. It largely obstructs the devlopment of local’s pipe corporation. So, it is necessary to develop pipeline simulation software with independent intellectual rights. It is significant for mastering the pipeline simulation technology, breaking the long-term monopoly from foreign and improving the technical progress in our pipe simulation.In this paper, it is pointed out that there is not any commerical pipeline simulation software with good commonability. Firstly, the recent research achivements in the field at home and abroad have been reviewed. Then, the key technology involved in gas pipe network simulation engine is presented that:the logical description on topological structure of large-scale gas pipe network, the establishment on numerical system of gas pipe network, the solving technology on numerical system and key problem, the dynamic simulation of compressor, the architecture design and implementation by the criterion of large-scale commerical software, the orthogonal test of simulation engine. At last, the stability, pricise and performance of simulation engine are illustrated by pratical example. Major jobs of this paper are as follows.(1) According to the research and development criterion of large-scale commerical software, the architect design and implementation of gas pipe network simulation engine are completed with the compressive application of the design concept based-on pattern-oriented, the design technology of architect, OOD and OOP.(2) All topological structure of gas pipe network is described effectively by digraph. On this basis, the topological sorting sequence, the collection of branch nodes and branches, the identification of externals, the validation of pipe network model’s availability.(3) The method and steps on establiment of large-scale gas pipe network are studied. The numerical form of pipeleg and other pipeline elements are presented.(4) The key technologies involved in the solution on numerical system of large-scale gas pipe network are studied. It is presented that the comprehensive application on strategy of frog-leg and upwind. It is also showed that the process of initial status.(5) It is presented thoroughly that the problem on the dynamic simulation of compressor. The steady process on starting and stopping of compressor are implemented by applying the strategy named "delay jitter". The method and steps on dynamic simulation of compressor are illustrated. (6) The orthogonal test is applied to accomplish the overall test on simulation engine and find out the bottleneck of simulation engine’s performance.(7) Taking WestEast natural gas transmission project for example, the computational accuracy, computational efficiency and usability are show by contrasting the dynamic simulation results of this software and SPS,and this simulation software is very valuable in engineering practice.