Method for Determining Actual Flow of High Pressure Gas Pipeline Network Nodes under Accident Conditions

Abstract

The invention provides a determination method for actual flow of high-pressure gas pipe network nodes under an accident condition. The method comprises following steps: firstly, utilizing a conventional hydraulic calculation method of a ringed pipe network to establish a hydraulic calculation program in order to simulate pressure of all the gas nodes in the pipe network under the accident condition based on the assumption that actual flow of all gas nodes is equal to design flow of gas nodes in the pipe network under the accident condition; gradually decreasing actual flow of a minimum pressure node in a pipe network system when pressure of any simulated gas node cannot satisfy the minimum node pressure required by the pipe network; and then, adopting the mode of successive iteration to simulate pressure of all the gas nodes under the accident condition till pressure of all the gas nodes can satisfy the requirement for pressure of the minimum node pressure, wherein flow of the gas nodes at this time is actual flow of the nodes under the accident condition.The determination method for actual flow of the high-pressure gas pipe network nodes under the accident condition has following beneficial effects: the determination method can scientifically determine actual flow of all the gas nodes in the pipe network under the accident condition at error rate of 10.54%.

Description

technical field [0001] The invention belongs to the field of urban gas pipeline network operation monitoring and gas source emergency dispatching, and relates to a method for determining the actual flow rate of high-pressure gas pipeline network nodes under the accident working condition of the urban high-pressure gas pipeline network. Background technique [0002] The urban high-pressure gas pipeline network is the aorta of urban gas supply and the lifeline project of the city. Its main function is to transport and distribute gas with sufficient pressure and flow to all users. In order to ensure the safe and stable operation of the pipe network, the pipe network is generally designed to be ring-shaped according to the flow required by the user. The biggest advantage of the ring pipe network is that it has a high backup capacity. When an accident occurs in a certain pipe section in the pipe network (referred to as the accident condition) and needs to be isolated from the pip...

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Problems solved by technology

It is also impossible to make a reasonable assessment of the overall gas supply capacity of the pipeline network system under accident conditions using existing methods. At the same time, the actual amount of gas that can be obtained by each gas node cannot be accurately determined, which greatly affects the operation monitoring of the gas pipeline network, Scientific formulation and implementation of emergency response plans such as gas source dispatching

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