摘要
为了分析具有6 km跨度的特高压气体绝缘金属封闭输电线路(gas insulated transmission line,GIL)内SF_(6)泄漏气体的泄压过程及其扩散形态,提出1D、3D混合计算流体动力学(computational fluid dynamics,CFD)方法,建立1D Flowmaster和3D Fluent流动混合数值分析模型,分析SF_(6)在管廊内的扩散形态及浓度分布。为实现SF_(6)泄漏工况条件的通风系统优化,结合管廊散热通风系统设计要求,对具有上、下腔结构的GIL管廊进行不同通风条件下SF_(6)扩散形态、浓度分布对比分析。综合通风系统实际运行特点,以优化安全逃生距离为目标,对通风系统运行方式、通风系统配置方案进行对比分析及优化。数值模拟计算结果表明:该方法可实现大跨度管廊SF_(6)泄漏过程模拟,采用具有上、下腔结构的GIL管廊结构设计,能够达到快速吸收、排放SF_(6)的目的,并将人体安全逃生距离设计在距离泄漏点65 m范围内。
In order to analyze the pressure relief process and diffusion of SF_(6) leakage gas in the UHV gas insulated transmission line(GIL)with 6 km span,this paper proposes a 1D and 3D hybrid numerical method.It establishes the 1D Flowmaster and 3D Fluent flow hybrid numerical analysis model to analyze the concentration distribution and diffusion of SF_(6) in the tunnel.The simulation result showed that this method can be used to simulate the leakage process of SF_(6) in the UHV shield tunnel.To optimize the ventilation system under SF_(6) leakage condition,it combines with the design requirements of ventilation system for heat dissipation and carries out CFD analysis under different ventilation conditions for the shield tunnel with upper and lower cavities to get SF_(6) diffusion pattern and concentration distribution.According to the actual operation characteristics of the comprehensive ventilation system and aiming at optimizing the safe escape distance,it makes comparative analysis of the operation mode and configuration scheme for the ventilation system.The calculation results show that this method can realize the simulation of SF_(6) leakage process,the design of shield tunnel with upper and lower cavities can quickly absorb and discharge SF_(6),and the safe escape distance of human body is designed within 65 m from the leakage point by closing the upper ventilation system and guiding SF_(6) to the lower chamber of shield tunnel.
作者
肖国锋
何娜萍
XIAO Guofeng;HE Naping(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou,Guangdong 510663,China)
出处
《广东电力》
2021年第3期122-129,共8页
Guangdong Electric Power
基金
中国能源建设集团广东省电力设计研究院有限公司科技项目(ER04191W)。
关键词
盾构管廊
SF_(6)
耦合分析
通风系统
设计优化
shield tunnel
SF_(6)
1D and 3D coupled analysis
ventilation system
design optimization
