气云爆炸驱动下并行管道动力响应分析

Analysis of the dynamic response of a parallel pipeline driven by a gas cloud explosion

为研究输气管道泄漏爆炸对并行管道动力响应的影响,基于气云爆炸过程,利用ANSYS软件建立了三硝基甲苯(trinitrotoluene,TNT)-空气-土体-管道有限元模型,分析了并行间距、壁厚、管径三个参数对并行管道动力响应的影响,并进行了敏感性分析。结果表明:目标管道的最大等效应力随管径增加而增加,随并行间距、壁厚的增加而减小;输气管道泄漏爆炸时,并行间距对管道动力响应的影响最大,其次是管径和壁厚;在相应模拟工况下,原油管道的安全并行间距为6.18 m,安全管径为742 mm,安全壁厚为26.4 mm。从安全生产的角度考虑,埋地管道并行敷设时,应首先考虑增大管道并行间距以保证管道安全运行,其次为减小管道管径、增大管道壁厚。研究结果可为并行长输管道的安全评估提供参考。

The leakage of buried gas pipelines containing defects can cause gas cloud explosions,posing a severe threat to the safe operation of parallel pipelines.Therefore,studying the dynamic response of parallel pipelines under gas pipeline leakage explosions is significant for ensuring the long-term stable and safe operation of parallel pipelines.This article is based on the method of energy equivalence to determine the equivalent trinitrotoluene(TNT)equivalent of gas cloud explosions.Based on the physical process of gas cloud explosion.A finite element model of TNT-air-soil-pipeline was established using ANSYS software.The influence of parallel spacing,wall thickness,and pipe diameter on the dynamic response of parallel pipelines was analyzed.The importance of different influencing factors was obtained using the single-factor sensitivity analysis method.The results show that the maximum equivalent stress of the target pipeline increases with increasing pipe diameter and decreases with increasing parallel spacing and wall thickness.Under corresponding simulated working conditions,the crude oil pipeline with X70 pipe material,1 m burial depth,and 8 MPa pressure has a safe parallel spacing of 6.18 m,a safe pipe diameter of 742 mm,and a safe wall thickness of 26.4 mm.Parallel spacing has the most significant effect on the dynamic response of parallel pipelines during gas pipeline leakage explosions,followed by pipe diameter and wall thickness.From the perspective of safety production,when laying buried pipelines in parallel,the first consideration should be to increase the spacing between parallel pipelines to ensure safe pipeline operation,then reduce the pipeline's diameter and increase the pipeline's wall thickness.The research results can provide a reference for the safety assessment,risk prevention,and control of parallel long-distance pipelines during the design and operation stages and a scientific basis for the safety distance and operation protection decision-making of pipeline laying.