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

To investigate effects of smoke prevention and extraction design in a large space primary processing workshop of cigarette,FDS was used to simulate the fire development in the workshop according to the fire performance-based design. Simulation results prove that the index of smoke temperature, CO concentration and visibility below 2.00 m′s high in the workshop is safe for the evacuation in each fire scenario. The structure safety of the steel roof will not be damaged in 2 400 s after burning. The main reason for smoke spreading much more fast is that more than one fan evacuates 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 fans in different time segments. The height of hang walls, dividing smoke bays, is greater than 0.70 m.