氨纶防黄剂粉尘的着火特性分析

Analysis on Ignition Characteristics of Spandex Anti-yellowing Agent Dust

为研究氨纶防黄剂粉尘的燃烧特性,采用粉尘云最低着火温度标准实验装置和同步热分析技术,分别研究了典型防黄剂HN-150粉尘云最低着火温度(MITC)的分布特性和粉尘热解过程,根据实验结果进行燃烧特性和动力学分析。研究结果表明:粉尘粒径越小,MITC越低;喷尘压力增大,MITC升高;粉尘云质量浓度增大,MITC先降低后稳定,且当粉尘云质量浓度大于2 096 g/m^(3)时,MITC稳定在270℃,小于150 g/m^(3)时,不会发生着火;粉尘云质量浓度对MITC的影响最大。随着粒径的增大,粉尘的着火温度、峰值温度、燃尽温度呈上升趋势,最大燃烧速率、平均燃烧速率、可燃性指数和综合燃烧特性指数呈下降趋势;随着升温速率的增大,粉尘的燃烧特性参数均呈上升趋势。随着粒径的减小,粉尘的平均活化能减小,越容易发生燃烧。MITC和热解过程中的着火温度相对应,这与燃烧特性和热分析动力学结果一致。因此该基础研究可为防黄剂的安全生产提供参考依据。

In order to study the combustion characteristics of spandex anti-yellowing agent dust, a standard experimental device for the minimum ignition temperature of dust cloud and a simultaneous thermal analysis technique were used to study the distribution characteristics of the minimum ignition temperature of dust cloud (MITC) and pyrolysis characteristics of anti-yellowing agent HN-150. The results show that: the smaller the dust particle size, the lower the MITC;the dust spray pressure increases, the MITC rises;the dust cloud concentration increases, the MITC first decreases and then stabilizes, and when the dust mass concentration is greater than 2 096 g/m^(3), the MITC are stable at 270 ℃, and when it is less than 150 g/m^(3), no fire occurs. With the increase of particle size, the ignition temperature, peak temperature and combustion temperature of dust show an increasing trend, and the maximum burning rate, average burning rate, flammability index and comprehensive combustion characteristics index show a decreasing trend;with the increase of heating rate, the combustion characteristics parameters of dust all show an increasing trend. As the particle size decreases, the average activation energy of the dust decreases, and the more prone to combustion. MITC and the ignition temperature in the pyrolysis process have a corresponding relationship, which is consistent with the results of combustion characteristics and thermal analysis kinetics. The ignition temperature of MITC and pyrolysis process is consistent with the results of combustion characteristics and thermal kinetics analysis. Therefore, this basic study can provide a reference basis for the safe production of anti-yellowing agent.