天然气管网故障的关阀方案

Valve closing scheme of gas pipeline in case of fault

在天然气管网运行期间,会不定期地发生故障,排除故障必需隔离出故障元件。传统方法是通过节点遍历法,建立管网的网络模型,通过对模型的遍历,搜索最小的影响区域,得到关闭阀门数量最少的关阀方案,该方法流程清晰,但是却很难直观地了解阀门关断区域的内容以及阀门之间的连接关系。采用矩阵法,基于平面管网建立管网拓扑矩阵,以及阀门系统的关联矩阵,通过矩阵的基本操作,识别阀门集合与关断区域的关联,建立阀门网络,而元件故障时所需关闭的阀门可直接通过搜索阀门网络的关联矩阵得到,从而实现关阀方案的迅速制定。本方法较节点遍历法能更清楚地反映阀门关断区域与阀门以及管道之间的联系,更好地反映实际情况,为实际操作提供有力支持。

During the operation of natural gas pipeline network, faults will occur irregularly. To eliminate the faults, it is necessary to isolate the fault components. The traditional practice is to establish a pipe network model using node search algorithm, the smallest influence area of a fault is searched through the traversal of the model, and so a valve closing scheme in which the number of closed valves is minimum is gained. The process of this approach is clear, but it is difficult to identify the association between each subset of valves and the segments directly isolated by closing them. For this reason, matrix algorithm is proposed, which establishes a network topology matrix and a relational matrix of valve system based on planar network. The association between each subset of valves and the segments directly isolated by closing them is identified through the basic operation of matrix to build a valve network. The valves to be closed when fault occurs can be directly got by searching the relational matrix of the valve network, and so a valve closing scheme is quickly obtained. Compared with the node search algorithm, this algorithm can more clearly reflect the association between each subset of valves and the isolated segments, and provide a strong support for the actual operation.