共查询到18条相似文献,搜索用时 62 毫秒
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本文使用锥形量热计对一种表面粘贴阻燃PVC的仿橡木人造密度板(商品名为"白橡板")的燃烧性能进行了实验研究。研究结果表明,这种PVC人造板具有相对较好的火灾安全性能。 相似文献
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几种铺地材料燃烧性能的锥形量热计研究 总被引:2,自引:1,他引:1
利用锥形量热计对几种铺地材料的燃烧性能进行了研究。对几种各种铺地材料在不同热辐射条件下的点燃时间、热释放速率、质量损失速率、CO/CO2生成率等燃烧特性进行了定量研究,综合评价了材料的燃烧性能,初步探讨了机理。 相似文献
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本文回顾了锥形量热计 2 0年来的发展历史和利用它所开展的研究及其成果 ,并对锥形量热计将来的应用领域进行了展望 相似文献
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在建筑内部的装修装饰中,人造木质板材的应用极其广泛,为了研究人造木质板材的燃烧性能,文章以密度板、刨花板、细木工板和胶合板四种常见板材为研究对象,采用锥形量热仪和傅里叶红外烟气分析仪等仪器从点燃时间(TTI)、热释放速率(HRR)、火灾性能指数(FPI)、有毒气体四个方面对人造木质板材的燃烧性能进行分析,研究结果表明:点燃时间由短到长依次为细木工板、胶合板、密度板、刨花板;四种人造木质板材均出现两个热释放速率峰值,而且两个峰值之间存在一个稳定的燃烧阶段,变化情况与点燃时间基本相符;胶合板最先发生轰燃,其次是细木工板、密度板、刨花板,FPI逐渐增大,轰燃威胁逐渐减弱;燃烧过程中有毒气体CO和NO含量的变化曲线都存在两个峰值,同一种类板材燃烧初期NO产量更多,燃烧中期CO、NO产量较少,燃烧后期,产生大量的CO更多;总体而言,细木工板和胶合板的火灾危险性接近最低,其次是密度板、刨花板。 相似文献
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利用锥形量热仪对超高温耐火电缆在不同辐射功率下的点燃时间(TTI)、热释放速率(HRR)、质量损失速率(MLR)和燃烧残余物进行了研究。研究表明,随着辐射功率增加,耐火电缆的TTI逐渐缩短,HRR和MLR逐渐增大,火灾危险性逐渐增加。超高温耐火电缆在35 kW/m2和50 kW/m2辐射功率下火灾性能指数相比于25 kW/m2分别增加了44.4%和176.5%,火灾增长指数分别增加了30.4%和83.0%。结合理论分析可以得出,耐火电缆的临界辐射功率为3.61 kW/m2、零辐射平均热释放速率为36.5 kW/m2,表现出较低的火灾危险性。 相似文献
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Estimates of the convection heat transfer coefficient (HTC) in the cone calorimeter are obtained from a near-steady-state analysis of the temperature histories of horizontal coated steel plates. Corrections are applied to the derived HTC values to account for changes of the surface emissivity as a function of temperature. Furthermore, estimates are obtained of the additional heat losses through the sides of the sample holder and the insulation layer on which the test sample rests. The derived HTC values are analysed and correlations presented in the form of Nu=f(Ra) as well as h=f(T), where Nu is the plate Nusselt number, Ra is the plate Rayleigh number, h is the HTC and T is the plate temperature. 相似文献
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J.E.J. Staggs 《Fire Safety Journal》2011,46(3):125-131
The problem of estimating the convection heat transfer coefficient (CHTC) in the Cone Calorimeter (horizontal sample orientation) is revisited. In this contribution the CHTC is modelled by a Nusselt number correlation of the form Nu=CRan, where Ra is the Rayleigh number. The parameters C and n are estimated using optimisation techniques applied to two different heat transfer models—one that assumes the sample is perfectly insulated on its unexposed face and the other that includes heat transfer to the insulation layer beneath the test sample. The results suggest that the insulation layer influences the derived values of CHTC and this observation is explored. 相似文献
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弹性地板因其质轻、安装简单、性能稳定等优点被广泛应用于室内外装修。临界热辐射通量是表征铺地材料在外部热辐射条件下火焰蔓延能力高低的检测项目。本文对PVC地板、LVT地板、WPC地板、SPC地板、橡胶地板和亚麻地板的临界热辐射通量检测结果进行比较。结果表明,PVC同透地板、LVT地板、WPC地板、SPC地板的临界热辐射通量值基本可达8.0kW/m2以上,燃烧性能等级达到B1(B-s1)级,PVC复合地板、橡胶地板及亚麻地板的燃烧性能稍差,燃烧性能等级一般在B1(C-s1)级。 相似文献
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频发的电动汽车着火事故引起了对离子电池火灾危险性与燃烧特性的关注。以锥形量热仪对常用的几种锂离子电池电解液溶剂的燃烧特性进行了,探讨了不同溶质对其燃烧特性的影响。借助火灾危险综合指数(IFHI)和闪燃特性指数对锂离子电池电解液的火灾危险性进行了评估,发现含LiPF6 溶剂热危险性从大到小依次为:LiPF6 +DMC、LiPF6 +DEC、LiPF6 +EMC、LiPF6 +EC;通过闪燃特性进行评价发现,中等火灾危险等级的有:LiPF6+EC;超高等火灾危险等级的有:LiPF6+DEC、LiPF6+DMC、LiPF6+EMC。 相似文献
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Intumescent coating acts as a thermal barrier for construction materials during fire hazards. The coating has the ability to expand by a factor of 40 or more during heat exposure. However, due to its fragile consistence, no physical or optical measurement technique has previously been able to measure the coating surface temperature during expansion. This is undesirable since without accurate information about the coating surface temperature, it will always be difficult to fully understand the heat transfer processes from the fire exposure to the coating and within the coating. Thermographic phosphor technique makes it possible to reliably measure intumescent coating surface thermometry. This paper presents the results of an experimental study using this technique. It compares experimental results with predictions of a calculation model for measurements made inside a cone calorimeter in well-controlled conditions. 相似文献