Study On The Influence Of Different Arrangement Of Smoke Exhaust Vents On Fire Smoke Of Subway Station Platform

With the improvement of subway carrying and transportation capacity,subway station safety has become a social focus issue.As a relatively high frequency and hazardous accident,subway fi res will cause huge losses to the city once they are out of control.Therefore,reasonable and efficient ventilation and smoke exhaust methods can not only provide passengers with a safe riding environment,but also achieve disaster control and disaster reduction effects in a catastrophic environment,ensuring the safety of personnel and the realization of social public benefits.This paper takes a certain island-type subway station in Xi’an as the research object.By constructing a full-scale geometric model,based on FLUENT,the transient numerical simulation of the effect of different layouts of platform smoke outlets on platform fire smoke is completed.Design four types of station smoke outlet layouts:"no smoke vent"," arranged on one side","arranged in the center" and "arranged on both sides",and place them in different platform fire scenarios to simulate each smoke exhaust in various catastrophic environments The smoke spreading state under the vent layout,the temperature and concentration of the smoke at the height of the human eye characteristics of the platform,the best smoke prevention layout is determined by comparing the research parameter standards under different layouts of the smoke exhaust;at the same time,the ventilation is proposed.The smoke exhaust optimization scheme is designed and simulated and verified.The simulation results show that when a fire occurs at a station,any fire scene cannot discharge smoke in a timely and effective manner through natural smoke exhaust,and it will cause the smoke to spread to the hall floor,seriously threatening the safety of personnel;The smoke exhaust effect of the "arranged on both sides" method is always better than that of the"arranged in the center" and "arranged on one side",which can ensure the safety of passenger evacuati on while meeting the standards of various research parameters.Based on the method of"arranged on both sides" of the exhaust outlets,when the fire disaster is severe,the schemes of"increasing the exhaust speed of the platform","exhausting smoke at the same time on the platform and section tunnels" and "exhausting smoke at the same time on the platform and station tunnels" are adopted.Conducive to improving smoke exhaust efficiency.The simulation results in this paper can not only provide support for the design of ventilation and smoke extraction methods for the actual project of island subway stations,but also provide a certain reference for fire smoke control and personnel evacuation,thereby ensuring the safety of personnel and property.