When the accident happens to the natural gas pipeline network,the pipeline network throughput will fluctuate because of the gas consumption change of large-scale users.The software TGNET is used to establish the pipeline network simulation model to simulate the accident conditions,and then a variety of reasonable dispatch schemes are determined.The multi-objective comprehensive evaluation model is established by considering the effects of temperature change,pipeline pressure fluctuation,pressure safety index and end-piece storage capacity on the safe operation ofthe pipe network,and different dispatch schemes are evaluated.Among them,the water concentration is calculat ed by software Aspen HYSYS,the judgment matrix is established by the improved analytic hierarchy process,and the comprehensive correlation degree is calculated by the gray correlation method.Project application shows that the software TGNET can accurately simulate the working condition change of the natural gas pipeline network,and the multi-objective comprehensive evaluation method can be used for the evaluation and optimization of dynamic simulation schemes,which provides reference for the safe operation of pipeline networks.%当天然气管网出现突发事故时,管网输量会因大型用户用气量的变化出现波动,利用TGNET软件建立管网仿真模型对事故工况进行模拟,可确定多种合理的管网调度方案.通过综合考虑气温变化、管道压力波动、压力安全指数及末段储气量对管网安全运行的影响,建立多目标综合评价模型,并对不同调度方案进行了评价.其中,采用Aspen HYSYS软件计算含水量;使用改进的层次分析法建立判断矩阵;利用灰色关联法计算综合关联度.工程应用表明,TGNET软件可以准确模拟天然气管网工况变化,且多目标综合评价方法能够用于动态仿真方案的评价及优选,为管网安全运行提供了参考依据.
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