A Study On The Design Of The Smoke Exhaust System In The Project Of Shenyang International Financial Center

In this paper,according to the research status of super high-rise building smoke control system,firstly introduces the characteristics of the fire and the smoke control system design;Secondly,this paper proposed ShenYang international financial center as an example,mainly introduces two serviced apartment towers and related basement and the podium of the smoke control system design.Meanwhile,numerical model is established with field model FDS and smoke movement is simulated in high-rise building fire.Based on simulated results,factors influencing effect of natural smoke exhaust,mechanical smoke exhaust and lobby pressurization are analyzed.Factors influencing effect of natural smoke exhaust include heat release rate of the fire source,position of the fire room,size of windows and length of corridor.Factors influencing effect of mechanical smoke exhaust include smoke extraction volume,position and number of smoke vent,position of the fire room etc.Through the simulation:on the one hand,the flue gas can’t be effective exhausted if the exhaust is too small,one the other hand,the air’s volume couldn’t unlimited increase,when gas displacement reaches a certain threshold,little impact on flue gas distribution rule and reason to choose reasonable to exclude the flue gas of the gas displacement can not only effectively,and reduce running and tubing expense;Bar corridor of the mechanical smoke exhaust system is affected by exhaust port number is not large,but the conclusion may be different for different pattern construction,concrete analysis should be done in actual application,guarantee the corridor of the mechanical smoke exhaust effect;For bar corridor,under the condition of the same amount of smoke,when the room is located in between the exhaust mouth fire,smoke exhaust effect is better.In front of the fire below the floor,indoor and the elevator door pressure increases with the increase of the floor,because the fire floor room before the door is opened,the layer pressure loss decreases quickly,in the burning layer above the pressure decreases with the increase of floor of floor.When the air output is 4m3/s,the pressure is different.It keeps at about 60-80Pa.When the air output is 5m3/s,it keeps at about 120Pa.When the air output is 6m3/s,it keeps at about 180Pa.Opening the lobby and elevator door is apt to cause pressure loss,so people in the building should avoid opening doors in the fire floor and its adjacent floors and evacuation by other floors can be considered.The floor above or below the fire floor can keep at positive pressure even its lobby and elevator door is opened.If the lobby and elevator shaft can keep at a certain positive pressure with pressurized smoke control system,elevator can stop at the floors except the fire floor so that people in the building can be evacuated by elevator.These results provide a theoretical instructions and technical support for effective control of smoke,smoke control design,personnel evacuation and fire fighting in high-rise building fire.