输气管网的水力可靠性分析方法

ANALYSIS METHODS FOR HYDRAULIC CREDIBILITY OF GAS TRANSMISSION PIPELINE NETWORKS

输气管网的水力可靠性决定了供气的可靠性和供气质量。现有的输气管网的水力可靠性分析方法对于流量和压力的关系,多采用0-1模式,即把供气可靠性简单分为“供气正常”和“供气中断”两种模式,这与实际情况有较大差异。为此,在供气可靠性研究中增加了“部分供气”模式,并采用3种可靠性特征量即:节点可靠度、体积可靠度和网络可靠度来表征管网的水力可靠性,并介绍了水力可靠性特征量的计算方法,还对实例管网正常工况和事故工况下的供气可靠性进行了分析计算。结果表明:在实际的事故工况中,各节点的供气可靠性均受到影响;离气源点越近,管网节点可靠性越高;离事故点越近,节点可靠性就越低,但输气管网的部分节点依然能够部分满足供气要求。这说明本方法的分析结果更符合输气管网的实际。

The hydraulic credibility of gas transmission pipeline network can determine the gas supply reliability and quality. The 0-1 model is always taken by the current hydraulic credibility analysis methods to deal with the relationship of flow rate and pressure, i.e.'gas supply functional' and 'gas supply failure' are two models to describe gas supply reliability, which is not in line with the realistic situation. Thus, 'partial gas supply' model is added to the research works of gas supply reliability and three characteristic quantities of reliability are adopted to represent hydraulic reliability: node point reliability, volume reliability and network reliability. Meanwhile, the calculation method for the characteristic quantity of hydraulic reliability is introduced. Furthermore, the gas supply reliabilities of gas pipeline network under functional and accident conditions are taken as case study. The findings indicate that the gas supply reliability of each node point is affected under the accident condition. The nearer the node to the gas source is, the higher reliability of the node will be; the nearer the node to the accident point is, the lower reliability of the node will be. However, part of the nodes can still meet a proportion of gas supply requirement, which justify the rationality of the 'partial gas supply' method.