Fire Smoke Diffusion And Ventilation Control Based On Traffic Tunnel Of Hydropower Station

The traffic hole of the hydropower station is a special tunnel connecting the underground powerhouse of the hydropower station and the external environment.In this paper,the model of underground plant and traffic hole of a pumped storage power station is constructed,and the fire simulation software FDS,is used to study the diffusion process of smoke in the underground powerhouse of traffic hole and hydropower station during the fire period and assuming that the fire door fails,and the effect of ventilation control method is analyzed according to the characteristics of smoke distribution.The main research contents are as follows:(1)The fire smoke of traffic hole is filled naturally.This paper analyzes the influence of the main factors such as the length,slope and fire source location of the traffic hole on the diffusion process and distribution characteristics of the fire smoke to the traffic hole and underground planr when there is a fire in the traffic hole,so as to provide reference for the design of smoke ventilation in the traffic hole fire.It is found that when there is a fire in the traffic hole,the fire smoke will pose a serious threat to the traffic hole and the underground planr.(2)The design of smoke exhaust system for traffic hole fire.First of all,the smoke control effect of the total smoke discharge and the distance between exhaust vents on the traditional semi-lateral smoke exhaust mode is analyzed.It is found that when there is a fire in the traffic hole,increasing the total smoke discharge and properly reducing the distance between the smoke vents is beneficial to the fire smoke control,but it can not effectively restrain the spread of fire smoke to the underground planr.Therefore,on the basis of the semi-lateral smoke exhaust mode of the traffic hole,a combined smoke exhaust mode of smoke prevention air curtain and smoke exhaust is added to the front chamber of the underground planr.the effects of the smoke discharge in the front chamber and the semi-transverse smoke exhaust system in the traffic hole on the fire smoke distribution in the tunnel are analyzed.The results show that the reasonable design of the combined smoke exhaust system can not only effectively slow down the spread of fire smoke in the traffic hole to the underground planr,but also prevent the smoke accumulation and countercurrent in the downstream of the fire source.(3)The design of safe escape passageway of traffic hole.Based on the principle of fire smoke isolation by pressurized air supply,the design method of safe escape passage in traffic hole is studied,and the effects of smoke prevention wind speed,fire source location and traffic hole slope on fire smoke isolation are analyzed.The results show that the pressurized air supply system can effectively block fire smoke when the smoke prevention wind speed is not less than 1m/s.