Abstract: In order to effectively control the kitchen flue fire in high-rise residential buildings, the water mist fire control simulation models for cooking oil fire and cooking grease fire of flue with branches in kitchen in high-rise residential buildings were established based on FDS. The effectiveness and the optimum parameters of the water mist fire suppression system were analyzed. The results show that once a cooking oil fire in the kitchen on the ground floor of a high-rise residential buildings was not suppressed in time, the hot flame and smoke will ignite the cooking grease in the flue under the effect of the strong chimney effect, and the exhaust duct fire will spread immediately. In the fire simulation model of the 30 m height kitchen flue with branches established in this paper, the optimum operation mode of the water mist fire suppression system is to shut down the exhaust fan in the kitchen, start the water mist spray nozzles of 0.6 L/min which are arranged directly above the oil pan and nozzles of 10 L/min at different positions of the main flue of the high-rise residential buildings. The best spray velocity should be 10 m/s with spray angle 60° and 500 μm diameter of water mist particle size.

Key words: high-rise residential building, kitchen flue, cooking oil fire, water mist, parameter optimization