城镇燃气管网事故工况及失效程度评价研究

Research on Accident Conditions and Failure Evaluation of City Gas Pipeline Network

为了掌握高中压燃气管网在事故发生后的水力工况,为管网事故评估以及管网调度奠定基础,提出了一种利用遗传算法求解管网事故工况的水力计算模型,以此得到事故发生后各节点实际流量,以及管网的压力分布,用来分析管网事故的影响范围和程度;提出了节点流量保证率的表达式,用于分析事故的影响程度,指导管网的调度决策;为了更好地对事故管网做出评估,采用综合评价法建立管网在某个气源事故下的失效程度评价模型,并根据失效程度做出相应的性能指标对应表,更直观地对管网事故的影响进行综合评价。通过算例分析,验证了水力计算模型以及管网综合评价模型的正确性,为管网事故工况的调度决策提供了理论依据。

In order to grasp the hydraulic conditions of the high and medium pressure pipeline network after accidents,and lay a foundation for the pipeline network accident assessment and pipeline network dispatching,a hydraulic calculation model using genetic algorithm to solve the accident conditions of pipeline network is proposed to obtain the actual flow of each node and the pressure distribution of the pipeline network after accidents,which is used to analyze the influence extent and degree of the pipeline network accidents. The expression of the node flow guarantee rate is proposed to analyze the influence degree of accidents and guide the scheduling decision of the pipeline network. In order to better evaluate the accident pipeline network,the comprehensive evaluation method is used to establish the failure degree evaluation model of the pipeline network under a gas source accident,and a corresponding performance index table is made according to the failure degree,and the influence of the pipeline network accident is more intuitively evaluated.Through the analysis of the example,the correctness of the hydraulic model and the comprehensive evaluation model of the pipeline network is verified,which provides a theoretical basis for the scheduling decision of the pipeline network accident conditions.