GIL管廊热环境及外逸气体浓度的分析  

Analysis of the thermal environment and concentration of escaping gas in the GIL pipe gallery

作　　者：徐大坤[1] 王浩[1] 姜洋彬 马秀婷 张文科 XU Dakun;WANG Hao;JIANG Yangbin;MA Xiuting;ZHANG Wenke(Shandong Electric Power Consulting Institute,Jinan 250013,China;School of Thermal Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东电力工程咨询院有限公司,济南250013 [2]山东建筑大学热能工程学院,济南250101

出　　处：《安全与环境学报》2024年第12期4695-4704,共10页Journal of Safety and Environment

摘　　要：以某GIL地下管廊为研究对象,利用FLUENT软件建立了GIL管廊的物理及数学模型,设置合适的通风系统,并设定管廊空间合理的初始和边界条件。目前已有的研究将管廊四壁视为绝热条件,而本文分析了GIL管廊与土壤之间的传热情况,基于自然进风、机械排风的通风方式,研究了冬夏季不同工况下的通风量对GIL地下管廊温度场的影响;此外,对电缆内SF_(6)气体发生正常或事故泄漏后的浓度分布进行模拟分析。结果表明:夏季管廊内通风散热效果不如冬季,管廊尾部电缆周围局部温度达到了42℃,虽然没有满足规范要求,但在可接受的温度范围内;非正常工况下电缆散热量比正常工况下高,因此非正常工况下通风效果较差,应定期检查;管廊下部设置SF_(6)气体排风口,在一定时间内可以将泄漏的气体排出。研究结果揭示了GIL管廊内温度及气体浓度的分布及变化规律,为确保GIL管廊的安全稳定运行提供理论依据和技术指导。This article focuses on a Gas Insulated Transmission Line(GIL)underground pipe gallery as the subject of study.It establishes physical and mathematical models of the gallery using FLUENT software,implements appropriate ventilation systems,and defines suitable initial and boundary conditions for the space within the pipe gallery.Existing studies typically consider the four walls of the pipe gallery as insulated conditions.In contrast,this paper innovatively analyzes the heat transfer between the GIL pipe gallery and the surrounding soil.It explores the impact of natural air intake and mechanical exhaust ventilation methods on the temperature field of the GIL underground pipe gallery under various operating conditions in both winter and summer.Additionally,this study simulates and analyzes the concentration distribution of SF_(6)gas within the cable following normal or accidental leakage.It is important to note that most existing references and studies treat the four walls of the pipe gallery as adiabatic conditions.This article examines the heat transfer between the GIL pipe gallery and the surrounding soil.The results indicate that the ventilation and heat dissipation within the pipe gallery are less effective in summer compared to winter,with local temperatures around the cable at the end of the pipe gallery reaching 42℃.Although this temperature does not meet regulatory requirements,it remains within an acceptable range.The heat dissipation of cables under abnormal working conditions is higher than that under normal conditions,resulting in reduced ventilation effectiveness during such periods.Therefore,regular inspections are necessary.The lower section of the pipe gallery is equipped with SF6 gas exhaust vents,allowing for the timely discharge of leaked gas and ensuring a safe operating environment for maintenance personnel.The findings of this study reveal the distribution patterns of temperature and gas concentration within the GIL pipeline gallery,providing a theoretical foundation and technical support f

关 键 词：安全工程 GIL管廊 热环境 温度场 SF 6气体 浓度场 数值模拟 

分 类 号：X93[环境科学与工程—安全科学]