Understanding flame propagation mechanism and thermal behavior of flammable dusts is of crucial importance, since they strongly affect the flammability and explosion parameters. In a previous work, we found that the volatile point of anthraquinone/nicotinic acid mixtures can be lower than the one of the pure dusts, suggesting a synergistic effect. In this work, thermogravimetric and differential scanning calorimetry analyses of anthraquinone/niacin mixtures were carried out both in open and closed cup, to explain the observed synergistic behavior. FTIR analysis on solid residue and evolved gaseous species showed that the mixtures change compositions during the thermal treatment, without undergoing any chemical transformation. The thermal behavior of dust mixtures reveals the presence of a eutectic point, resulting in a volatiles production at lower temperature and accelerating the flame propagation.

中文翻译：

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易燃粉尘和粉尘混合物的着火机理：通过热重/差示扫描量热分析获得的见解

了解易燃粉尘的火焰传播机理和热行为至关重要，因为它们会严重影响可燃性和爆炸参数。在以前的工作中，我们发现蒽醌/烟酸混合物的挥发点可能低于纯尘之一，表明具有协同作用。在这项工作中，在开杯和闭杯中进行蒽醌/烟酸混合物的热重分析和差示扫描量热分析，以解释观察到的协同行为。FTIR对固体残留物和放出的气态物质的分析表明，混合物在热处理过程中会改变组成，而没有发生任何化学转化。粉尘混合物的热行为表明存在共晶点，