An on-line simulation method of a large-scale complex natural gas pipeline network system

Abstract

An on-line simulation method of a large-scale complex natural gas pipeline network system is characterized gy firstly establishing a simulation model of the pipe network, carrying out the SCADA data connection, associating real-time data with the simulation model, carrying out the static simulation and finally the on-line simulation to describe the flow state, distribution and changing process ofthe pipeline network in real time; describing the response and changing process of all kinds of operation, control and events; giving the trend of hydraulic and thermodynamic change, obtaining the dynamic simulation of the pipeline real time state by a Newton-Raphson iterative method and the layer by layer calculation. The method of the invention realizes the on-line simulation and tracks the real-time hydraulic changing process of pressure, flow rate and flow velocity of the pipe network system, the thermal working conditions such as temperature, the changing process of fluid properties suchas flow rate, density, viscosity, sound speed, entropy and enthalpy, and the real-time changing process of pressure at the storage and special points.

Description

technical field [0001] The invention relates to the technical field of on-line simulation of pipeline systems, in particular to an on-line simulation method for large-scale and complex natural gas pipeline network systems. Background technique [0002] In the past 10 years, my country's oil and gas pipeline construction has accelerated. Among them, with the first, second, and third lines of the West-East Gas Pipeline, the first, second, third, and fourth lines of the Shaanxi-Beijing Gas Pipeline, the Yuji Pipeline, and the Sichuan-East Gas Pipeline, a number of large-caliber, long-distance, high-pressure, and high-throughput natural gas pipelines Construction and operation have been started one after another, and a huge national natural gas pipeline network system has basically been formed in my country. As an important infrastructure, natural gas pipelines have become the main mode of natural gas transportation and distribution, and their role as energy arteries in my count...

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Problems solved by technology

[0005] However, for many years, the simulation calculation and operation analysis of domestic natural gas pipelines, especially the online simulation technology, has been relying on imported commercial software (SPS, TGNET, etc.). It also faces problems such as technical blockade of foreign products, inadequate service, and difficulty in product expansion, which greatly restricts the business development of domestic pipeline companies; therefore, facing an increasingly large and complex natural gas pipeline transmission network, it is urgent to develop independent knowledge Property rights, stable, accurate and efficient online simulation technology of natural gas pipeline system, use computer simulation technology to simulate the thermal, hydraulic parameters and equipment operation status of pipelines under various working conditions, understand and master the operation status of the pipeline network system, and predict Operation control results under different operation schemes, and real-time diagnosis and troubleshooting of pipeline systems and equipment to better serve China's natural gas pipeline system and provide support for the safe, reliable and economical operation of China's pipelines

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