Natural Gas Pipeline Operation Optimization Technology Research And Software Development

The natural gas pipeline business of China at present enters into a fast development period. As the total length of these pipes will be more than100thousand kilometers at the end of twelfth five-year plan, the national pipeline network will turn into a more huge and complicated one. It’s an important subject for operating department to research on how to ensure the security, efficiency and economic operation of pipeline network. Therefore, it’s essential to study on the optimized operation of natural gas pipeline network.Researches on the steady-state optimized operation technology of natural gas pipeline network have become basically mature, and long-distance pipeline network’s nonlinear steady-state optimized operation model has also been recognized. As the constant renewal of pipeline network structure, the present study focus on the optimization algorithm and strives to solve the steady-state optimized operation model of long-distance pipeline network more rapidly, reliably, accurately and efficiently. With the increasing demand for natural gas pipeline business, there’s an urgent need of establishing a common model about steady-state optimized operation of natural gas pipeline network and application software from the aspects of production practice, which can both ensure computational efficiency and adapt to any constantly increasing reasonable topology as well as its size, and thereby enhancing the core competitiveness of domestic pipeline industry.Aiming at researching on efficient and stable optimization algorithm as well as the development of general optimization software, the main work of this thesis is as follows:(1) Based on investigations about research results of gas pipeline network optimization technology and simulation optimization software in recent years, establishing a mathematical model of steady-state optimized operation, which can achieve optimization goals of compressor energy consumption and gas transmission rate.(2) The steady-state optimized operation model is a typical problem of nonlinear constrained optimization, and the solving process is complex. In order to meet the production needs, while reducing algorithm’s dependence on the objective function and constraint conditions, so it needs an algorithm to ensure the computational efficiency and stability. By contrasting the existing optimization algorithm, improved linear approximation method and sequential quadratic programming (SQP) method are selected for further research.(3) Improved linear approximation method and sequential quadratic programming method are introduced to solve a small gas pipeline network, and one of the two algorithms adapted to the optimization software of RealPipe-Gas Optimizer1.0is selected.(4) Studying on the needs analysis of the optimization software of Realpipe-Gas Optimizer1.0during development process, including:comprehensive description, software architecture analysis, functional requirements analysis, business needs analysis, description of external interface requirements system characteristics and other non-functional ones.(5) To verify the reliability of the optimization software, Using it to optimize a gas pipeline network with the proposes of the lowest compressor energy consumption and the largest gas transmission rate.