The Perfect Research Of The Zhengzhou 27 Subway Station Under Fire Smoke Control Multiple Ventilation Mechanism

Forewarned is forearmed.In modern society,subway stations,as the main urban mobile places,are mostly built underground,with limited space and large daily traffic volume.They will even be crowded at rush hour.Once the accident is a threat to personal safety,easy mass death and casualty tragedy.The most important thing in the predictable accident is fire.There are many reasons for the fire.If it happens,if the control is not in time,or the evacuation is not in time,it will cause serious consequences.Therefore,in view of the complex air flow in the subway station,the CFD method is applied to analyze the air flow inside the station.The PHOENICS software is applied to simulate the fire of the typical subway stations and the typical locations inside the subway.Focus on the tunnel,station,station tunnel,station hall and other places when fire occurs,the tunnel ventilation machine TVF station,hot air exhausting machine TEF,PY and other open exhaust fan ventilation mechanism combination scheme and shielding door opening and closing of the platform,the train fire temperature field and smoke gas field.This paper chooses 27 of the Zhengzhou subway station as a typical application case,on the basis of the subway air distribution mechanism currently in operation,planning a set of more perfect subway air distribution scheme,and strive to in the subway station in different directions when the fire occurs,with the use of fan and air conditioning,air velocity,flow and reduce the flue gas concentration the way to escape the requirements.This paper will also carry out evacuation plan and flow coupling under fire conditions,but also for people in Zhengzhou 27 square station,based on peak flow and time distribution of the relationship between,based on empirical data estimates,using the corresponding formula,different time periods for passenger evacuation time needed to check.To explore whether the control of the station distribution system can meet the demand for escape in the subway fire.The research methods and results of this paper can be used for reference for the optimization of fire prevention and distribution scheme for other island subway stations.