风管中聚集物燃烧时极限温度的分析研究

Analysis and Study of the Limit Temperature of the Burning Sediment in Ventilation Ducts

利用火灾动力模拟软件（FDS）进行分析，通过正交试验法分析聚集物的厚度、通风风速、聚集物燃点和风管断面尺寸等对聚集物燃烧时的极限温度值的影响．研究结果表明：聚集物的厚度对风管中聚集物燃烧时的极限温度值的影响最大，通风风速和聚集物燃点次之，风管断面尺寸的影响最小．厚度为0．014m，通风风速为0．5～1．5m／s，燃点在300℃以下的聚集物燃烧时的极限温度值最大．

The sediment in the ventilation duct and air conditioning system can lead to a fire, and the existence of the duct is one of the major ways to spread the fire in the building. Using the fire dynamics simulator （FDS）, the effects of sediment thickness, the ventilation velocity, the sediment ignition points and the ducts dimension on the limit temperature of the burning sediment in the ducts were studied in the ort tal method. The results have shown that sediment thickness has the greatest influence on the limit temperature of the burning sediment, while the ventilation velocity and the sediment ignition points ranks the next, and the ducts dimension ranks the last. Among all the limit temperatures of the burning sediment, the one is the highest when the sediment thickness is 0. 014 m, the ventilation velocity is between 0.5 and 1.5 m/s, and the sediment ignition points is below 300 ℃. The research will play a positive role in duct protection and fire prevention.