基于泄漏扩散数值模拟的GIS室内SF6检测与回收策略

Detection and Recyde Strategy of SF6 in GIS Room Based on Numerical Simulation of Leakage and Diffusion

SF6因其优异的性能而广泛应用于电力工业,但SF6气体泄漏故障时有发生,威胁着大气环境、电气设备及运维人员人身安全。文中以某GIS室内盆式绝缘子开裂导致的气体泄漏事故为例,基于计算流体力学模型,开展真型尺寸GIS室SF6泄漏气体分布规律研究,掌握了GIS室内站SF6泄漏扩散分布规律。研究发现:SF6由开始外泄到均匀分布,会经历喷射、重力扩展、空气卷吸及被动扩散等4个阶段。进一步提出了SF6泄漏气体的回收策略,在0.3 m水平面合理布置SF6检测装置,能在10 s内快速高效检测到外泄气体;30 s内应将气体回收装置投入到气体泄漏区域开展工作,SF6回收装置应重点布置在GIS的四个角落,GIS室中部区域也应合理增设回收装置。

With regard to the fact that SF6 gas leakage occurs occasionally in electric power industry,which threatens personal safety,electric equipment and atmospheric environment,a gas leakage accident caused by cracking of a basin insulator in GIS room is taken as an example to investigate the diffusion process and distribution law of SF6 leakage gas in the true size GIS room based on the computational fluid dynamics model(CFDM).It is found that during the process from the beginning of leakage to uniform distribution,the SF6 undergoes four stages,i.e.,jetting,gravitational expansion,air entrainment,and passive diffusion.Furthermore,arecovery strategy of SF6 leakage gas is proposed,including properly arranging SF6 gas detection device in the horizontal plane with a height of 0.3 m to quickly and efficiently detect the leakage gas within 10 s,putting SF6 gas recovery devices into leakage area for work within 30 s and placing them mainly to four corners of GIS,and reasonably adding recovery devices in central area of the GIS room.