Study On Leakage Influence Law Of Typical Urban Gas Pipeline Network System

With the implementation of the national clean energy plan“Coal to Gas Project”,urban gas facilities are more and more widely used.Once the infrastructure such as urban lifeline is destroyed,the impact is huge.The stable operation of the urban lifeline system is an important factor that determines the health and stability of urban functions.Especially in the event of major disasters,once the urban lifeline system is destroyed,it will have a serious impact on the basic functions of the city.In particular,the secondary and derivative disasters that follow will not only aggravate the disaster,but also cause great obstacles to the emergency relief work.At present,the leakage of urban natural gas pipeline network is one of the important reasons for the threat to public safety,especially in crowded places in big cities.Once the leakage of natural gas causes explosion,it often causes serious accidents and social effects.How to timely detect gas pipeline leakage and prevent further expansion of accidents has become a hot issue in the current research of gas safety.In this paper,the variation of pressure in urban gas pipeline under different leakage conditions is taken as the research object.The influence of leakage hole size,number of leakage holes and initial pressure on internal pressure and leakage time is studied,which provides a theoretical basis for gas pipeline safety monitoring and early warning.On the basis of field investigation,the safety monitoring and leakage experimental platform of urban gas pipeline is built.The influence of leakage hole size,number of leakage holes and initial pressure on internal pressure and leakage time is studied by experiments.Then based on CFD numerical simulation software in Space Claim to establish a geometric model,CH₄ as the research object,through FLUENT model.