摘要
对不同温、湿度状态的棉花进行自燃温度测定和差热-热重分析,证实了热分析实验对实际自燃过程的高度重现,考察相对湿度变化对棉花热分解过程的影响,分析棉花的三种放热方式在该过程中的贡献,并对热分析曲线进行动力学研究。实验结果表明,棉花的自燃温度为260～280℃;空气气氛中,起始分解温度比氮气气氛中的提前了20℃,整个分解过程也发生了变化;相对湿度增加,自燃风险增大,但自燃温度仍在220℃以上;霉变反应是自燃风险增大的主要原因。
A series of cotton samples with different humidity and temperature were analyzed by self-ignition method and TGDTA. It was proved that thermal analysis method Can represent the self-ignition process of cotton. The effect of humidity in cotton＇s degradation process was studied, and the 3 exothermic methods of cotton in the process were discussed. Furthermore, the thermal analysis curves were calculated by kinetics method. Results showed that the self-ignition temperature of cotton is 260-280℃ The initial decomposition temperature in air atmosphere is 20 ℃earlier than that in nitrogen atmosphere, and the whole degradation process is different too; the self-ignition risk increases with the relative humidity, while the self-ignition temperature is still above 220 ℃ ; Mildew reaction is the main reason of self-ignition risk increasing.
出处
《消防科学与技术》
CAS
北大核心
2012年第1期100-103,共4页
Fire Science and Technology
关键词
棉花
自燃
热分析
动力学
cottom self-ignition
TG-DTA
kinetics
