Simulation Of Parameter Optimization Of Smoke Screen And Mechanical Exhaust System In Fire Of FuXin Underground Mall

In this thesis,Fire spreading law in the underground mall is studied with FDS fire simulation software in the exit sections 10 to 12 in FuXin Underground Commercial Street.When Fire occurred in the underground,the escape routes are mainly middle aisle,so it's important on the evacuation.This thesis mainly simulates Fire smoke movement characteristics of different fire positions,different smoke screen height,different pitches of smoke screen and different setting conditions of exhaust system.In Fire simulation,9 monitoring points are horizontally set in 1.75m which is the human eye characteristic height in this thesis which detect and analyze CO2 concentration,smoke layer height,temperature,visibility,etc.of each monitoring point,and then find the corresponding law.The results show that the CO2 concentration,smoke layer height and temperature lowering speed of monitoring points are inversely proportional to the distance of the source of fire,visibility is proportional to the distance of Fire source;Flue gas content away from the monitoring points of the source of are effectively reduced after adding smoke screens,and the smoke control efficiency is more obvious with the higher the smoke screens and the smaller settings spacing;combination of mechanical exhaust systems and smoke screen can get more control efficiency,the size of each exhaust port has nothing to do with the smoke control efficiency in the same total amount of mechanical exhaust;it's better to increase the number of the ports of mechanical exhaust and the smoke control efficiency is much better to set double row exhaust port than set single row exhaust port in the case of the same number of exhaust ports.