2006, Volume 8, Issue 12
Strategic Study of CAE >> 2006, Volume 8, Issue 12
Study of Suppressing PVC Fire with Water Mist Using a Cone Calorimeter
State Key Labrotary of Fire Science, USTC, Hefei 230027, China
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Abstract
In this paper, the action of water mist on PVC fires in a cone calorimeter under different external radiant heat fluxes was studied and the reignition of the PVC fires was analyzed. Water mist was generated by a single pressure nozzle. Physical characteristics of the water mist were measured by LDV/APV system. The heat release rate, oxygen, carbon dioxide, and carbon monoxide concentrations and other important parameters of the interaction under various conditions were measured by cone calorimeter. The experiment illustrated that water mist would suppress the PVC fire by evaporation cooling, oxygen displacement and radiant heat attenuation. After the fire was extinguished and water mist was shut off, fire might reignite after a period of time. The reignition time depended on the total quantity of water mist.
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Figures
图1 实验装置示意图
图2 距喷口100 mm处细水雾粒径沿径向的分布
图3 距喷口100 mm处细水雾轴向速度 沿径向的分布
图4 热辐射流量为50 kW/m2时热释放速率 变化曲线图
图5 热辐射流量为50 kW/m2时O2质量分数变化曲线图
图6 热辐射流量为50 kW/m2时CO2质量分数变化曲线图
图7 热辐射流量为50 kW/m2时CO 质量分数变化曲线图
图8 热辐射流量为50 kW/m2时烟气的比 长度消光系数变化曲线图
图9 热辐射流量为70 kW/m2时不同细水雾压力 下热释放速率变化曲线图
图10 细水雾压力为0.4 MPa时不同热辐射 流量下热释放速率变化曲线图
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