Study On The Smoke Control Measures In The Atrium-Style Library Fire

Atrium architecture,with its bright visual space,natural and pleasant environment,and the structure function diversity characteristics,has become the inevitable choice for the current urbanization development;at the same time,With the improvement of the people’s comprehensive quality,more and more library functions are needed.However,atrium-building has many characteristics,such as well vertically versed in multilayer and complex internal structure and complicated structure;the characteristics of the library are that,it has more burnable staff,and densely large population,so the library atrium-building got fire,the fire will spread extremely rapidly,it will cause a serious threat to the people’s life and property safety.Therefore,Fire and smoke spread characteristics and fire prevention and control measures are studied on the basis of the atrium-building research in this paper.In this paper,the fire dynamics FDS software is used to establish the fire model of library atrium-building,where the fire occurs in the atrium adjoining room area.Based on the fire research using different ways of atrium and corridor area exhausted smoke style,a numerical simulation is carried out to explore the control effects of fire smoke atrium by using different atrium and corridor area of smoke extraction on atrium smoke during the experiment;Analysis is made on the atrium in case that a fire occurs in a adjoining room area,the control effects of different height of the smoke screen to limit the smoke spread into the atrium;through the installation of water mist curtain and mechanical exhaust somke common in the corridor area in atrium,the atrium fire smoke optimization analysis and determine water mist curtain installation spacing,flow rate,spray angle effect block the smoke,to find the best way to control smoke for the library atrium-style building fire.Firstly,two different modes of smoke exhaust and four different working conditions of exhaust smoke mode are adopted in the fourth chapter in this paper,when the library atrium adjoining area fire smoke effect for comparison.Four kinds of working conditions are set in the smoke prevention stair well layers of positive pressure air supply,by comparing the trends of visibility,carbon monoxide concentration,temperature and other parameters in the corridors around the atrium,establishing the optimal way to smoke while taking 108000 m3/h,the amount of smoke in the corridors district court in accordance with the amount of mechanical exhaustcorridor area when the area 60m3/h per square meter,is the best exhaust smoke quality,to create a good protection for the evacuee.Secondly,in this paper,the effects of different height restrictions are studied under the hanging wall of the atrium smoke spread of Library building.The use of block reservoir smoke hanging wall formation in the corridor area will be a large number of gas accumulation,can greatly slow the fire smoke to the atrium adjoining room area spread time,therefore,the reasonable height of hanging wall on Library will limit the smoke spread.The atrium building fire model with four different kinds of conditions are made in this paper and each height of no hanging wall and hanging wall is 0.5m,1.0m,1.5m.Through the comparing analysis of the simulation results,the conclusion is that when the height of smoke screen is increased from 0.5m to 1.0m,the visibility of-the atrium of Library and library all layers is significantly enhanced.However,when the hanging wall’s height increases to 1.5m,the enough smoke control for the library hasn’t improved significantly,but will cause a greater impact on the visibility fire corridor area,the reasonable height of the corridors of the atrium library hanging wall is 1.0m.Finally,in this paper,the water mist curtain of fog is added to set up in the library of atrium adjacent room area outside of the fire room and the feasibility of using water mist curtain is explored in the atrium corridor area under the certain circumstances the mechanical exhaust smoke and positive pressure air supply opening time,and adding water mist curtain,found water mist curtain installation will greatly limit the spread of fire in building atrium and change the flow of the water mist nozzle.By contrast the smoke in the building has been optimized,but the increase of water mist nozzle flow,will not promote the control effect of the smoke,For the library atrium buildings the recommended sprinkler for 5L/min,flue gas optimization can achieve good results.