Numerical Simulation Dense Gas Diffusion And Study Of Ventilation Control For The Underground Hydropower Plant Cable Layer

The contribution of hydropower plant plays more important role in our country for the superior performance of hydropower resources and serious energy shortage. The GIS ventilation designing for workspace is so important during the contribution of hydropower plant that the performance of ventilation including thermal environment and air distribution had direct effects on the efficiency of workers and the running of machines. This paper studies the main electrical wire hall which is a critical network basic cell during establishing ventilation and air conditioning systems network model of the underground excavation cluster of hydropower station by the way of CFD numerical simulation combined with model experiment, based on Beipanjiang guangzhao hydropower plant's ventilation model.This paper gains the cable layer under heatd and unheated conditions by means of the cable layer model experiment. Then it gains the cable layer has non-prominence difference under heated and unheated condition .The paper contrasts CFD numerical simulation result with model experiment result of the cable layer of Beipanjiang guangzhao hydropower station, proves it is feasible and credible that gains the cable layer SF6 concentration field by means of CFD numerical simulation. Then analyze the cable layer and its influence factor under unheated condition by means of CFD numerical simulation. By means of analyse, from architecture structure point of view the cable layer absoluteness degree and channels inlet change have little effect on concentration field, but stairs and fireproofing vent have more. Form equipment disposal inside point of view air draft quantities and the amount of fans and its disposal have much effect on concentration field,and release quantity and position have much effect on concentration field.We gain the best air draft position by means of different conditions. Also we gain different concentration field under different draft quantity and release quantity condition. Then it gains the SF6 concentration curve fitting.In addition, there is production, stockpiling and use of all types of dangerous substances, including toxic and flammable gases and liquid, in Chinese chemical, oil, gas and other industries including some underground work shop such as hydropower plant. If there is a sudden release ,people and entironment would be polluted and groups poisoning even death . Therefore, this paper will rely on the study of the heavy gas called SF6 in cable layer of the power station, thus, some of the expanding scope of the study has been made, the leakage and spread of the liquefied petroleum gas, chlorine was simulated and the law on diffusiveness of different heavy gas in large underground space was researched, hoping that the universal law applied to the diffusiveness of the heavy gas.