|
Subway as an important means of transport in many cities put into use , the subway , however , the event of fire , high temperature flue gas is a serious threat to people 's transportation environment safety . Fire , subway mechanical smoke control system to detect rapid fire , rapid start , the effective discharge of high temperature and noxious fumes , evacuation and fire fighting and rescue provided favorable conditions . Therefore , to study the case of fire , the subway mechanical smoke control system under different operating modes , subway platform interval flue gas spread flow rule , and then comparing the efficiency of different working conditions smoke control system , subway mechanical smoke control system performance design guidance and basis , and can provide auxiliary the subway fire control optimization and decision-making , has important practical significance . Xi'an Metro Line typical station weft Street Station for the study, through the analysis of the characteristics of the subway fire smoke and smoke control system using the FLUENT software , the establishment of a subway station platform fire smoke physical model , selected formula to determine the boundary conditions , thus simulation studies under different conditions , the platform layer , station hall layer of smoke spread in the current law , analysis of different operating conditions smoke control system efficiency and the measured data to verify existing smoke control system safety and efficacy of the design . Research results show that the fire or fire concourse level of the platform layer , existing smoke control system operating modes for the effective discharge of flue gas effect is inconsistent ; fire platform layer , to increase the distance between the anti- smoke vents or reduce the smoke exhaust port distance between little ; conditions smoke screen hanging wall effect, blocking the flow efficiency of smoke spread is greater than the conditions the efficiency of the smoke screen ; increase the number of smoke exhaust port , reducing the effectiveness of the role of smoke the smoke exhaust port unit area exhaust rate , while reducing the distance between the anti - smoke vents , and the joint action of the smoke screen , blocking the the smoke spread flow efficiency greater than the work efficiency of the working conditions ; the station hall fire , increased work mode , the distance between the smoke exhaust port is more conducive to the discharge of the high temperature and noxious fumes , and more conducive to the safe evacuation and fire and rescue .
|