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随着管网系统的建设,对其安全运行以及压力监控有了进一步的要求。减压阀操作简便,能够自动调节并稳定管段压力,广泛运用于油田集输系统、以及城市供水等管网系统中。本文讨论了建模过程中减压阀的运行工况对模型计算的影响并针对其自适应调节特征对管网模型计算提出修正方案。通过建立雅各比矩阵并运用牛顿法求解相应管道的流量以及压力,既能保证计算的收敛速度,又着眼于管网系统的整体性研究。根据初步计算,当管网中带有减压阀的管道可能出现液体逆流时,阀门将自动截流稳压,因此,需要修正模型并重新建立新的雅各比矩阵,对液体管网稳态输送下的管段流量以及节点水头进行计算。
With the construction of the pipe network system, there are further requirements for its safe operation and pressure monitoring. The pressure reducing valve is easy to operate and can automatically adjust and stabilize the pressure in the pipe section. It is widely used in the oil and gas transmission and distribution system and the urban water supply pipe network system. In this paper, the influence of the operating conditions of the pressure-reducing valve on the model calculation during the modeling process is discussed and a correction scheme for the pipe network model calculation is proposed according to the characteristics of the adaptive regulation. By establishing the Jacobian matrix and using Newton’s method to solve the flow and pressure of the corresponding pipelines, the convergence rate of the calculation can be guaranteed and the integrity of the pipe network system can be studied. According to preliminary calculations, the valve will automatically shut-off and stabilize when the pipe with pressure-reducing valve in the pipe network may have liquid reverse flow. Therefore, the model needs to be modified and a new Jacobian matrix should be re-established to stabilize the liquid pipe network Under the pipe flow and node head calculation.