地下水电站GIS电缆层SF_6泄漏防护的通风数值模拟分析

Numerical simulation on ventilation of the cable floor of GIS in an underground hydropower station in conditions of SF_6 release

地下水电站GIS电缆层存在SF6重气泄漏并引发事故的可能性,需要对其防护通风系统的设计进行研究.讨论SF6重气泄漏扩散的物理过程,通过对GIS电缆层内SF6气体泄漏量、排风量、排风口数量及位置等影响因素分别进行数值模拟,分析各影响因素下GIS电缆层内SF6气体浓度场分布的规律,为此类水电站厂房通风系统的正确设计提供依据和科学指导.

In the cable floor of GIS in an underground hydropower station it is possible that the gas SF6 may leak out and cause serious accidents.It＇s necessary to study and design its ventilation system.Firstly this paper analyzes the physical diffusion process of the gas SF6 in theory.And then the paper simulates and analyzes following impact factors such as release rate,extract air flux,and outlets＇ amount and positions.As a result,the concentration laws of SF6 in an underground space in different conditions are found in the paper,which could provide design guidance for the ventilation system of such underground hydropower station.