变热流条件下XPS板辐射引燃特性试验研究  

Experiment Study on Ignition of XPS Board Exposed to Linear Heat Flux

作　　者：张国维[1] 朱国庆[1] 黄丽丽[2] 韩如适[1] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221008 [2]广州中国科学院工业技术研究院,广东广州510000

出　　处：《建筑材料学报》2013年第5期840-845,共6页Journal of Building Materials

基　　金：住房和城乡建设部科学技术项目(2011-K1-53)

摘　　要：为研究XPS保温板在变化热流作用下的引燃特性，对10组变热流条件下2．2，4．5C1TI厚XPS保温板辐射引燃特性进行了试验．测量了XPS保温板表面接受到的热辐射强度、引燃时间、表面温度以及质量损失速率．结果表明：0．0194kW／（m2·s）热流变化率不足以引燃XPS保温板试样；当热流变化率大于0．0373kw／（m2·s）时，在热流的作用下XPS保温板表面温度逐渐升高；当温度达到I临界着火点时，XPS保温板瞬间燃烧，发出耀眼火焰和黑色浓烟，同时温度闪升至970．5℃左右；当有焰燃烧结束时，表面温度突降，燃烧过程结束；在有焰燃烧阶段，XPS板质量呈线性递减；临界着火点温度为336．0~387．0℃，且XPS保温板引燃时间与热流变化率具有乘幂关系，幂指数约为-0．765．The thermal radiation intensity on the XPS board, the ignition time, the mass loss rate and the surface temperature were measured in 10 sets of ignition experiments of 2. 2 cm and 4. 5 cm thick XPS boards. The ignition characteristics of XPS boards in different linear heat flux were studied. The experi- ment results show that the 0. 019 4 kW/（m2 · s） heat flux is not high enough to ignite the samples. Under the heat flux exceeding 0. 037 3 kW/（m2 · s）, XPS board was heated to the critical ignition temperature and then the sample was suddenly burnt with the glaring flame and black smoke. After combustion of XPS board, the temperature decreased rapidly from 970.5℃ of maximum temperature. And the experiments also show that the mass of XPS boards decreases linearly with time during the rapid burning stage, the critical ignition temperature is 346.0 - 398.0 ℃, the ignition time has power relation to the heat flux rate with power exponent of --0. 765.

关 键 词：XPS保温板 热辐射 温度 质量损失速率 

分 类 号：TU551.1[建筑科学—建筑技术科学] TU998.1