A performance-based design on smoke control in a large space primary of cigarette processing workshop

A series of real fire tests for typical combustible objects were carried out to investigate the effects of smoke prevention and extraction design in a large space primary processing cigarette workshop,203.9 m long,72 m wide and 16.7 m high.Fire tests show that the heat release rate in the workshop is 41.1~98.0 kW/m2 and develops as a slow t2 fire.FDS was used to simulate the fire development in the workshop according to the fire performance-based design. Simulation results prove that both the index of smoke temperature and CO concentration below 2 m's high in the workshop is safe for human for2400 seconds in each fire scenario,but the index of visibility is lower than 10 m when fires developed to 2000 seconds.The main reason for the smoke spreading more fast is that more than one fan evacuates the smoke at the same time.It is necessary for mechanical smoke extraction design in a large space building to divide smoke bays and to start fanning in different time segments.The height of smoke screens,separating smoke bays,is greater than 0.7 m.