基于F-K理论的抛光铝粉自燃特性及自燃临界条件

采用网篮试验研究抛光铝粉自燃特性、自燃临界条件及氧化过程中温度时空分布规律.根据Frank-Kamenetskii(F-K)理论，分别采用差分法和交叉点温度法对试验数据进行分析，计算氧化反应动力学参数并对试验结果进行外推，预测工业现场堆积尺度下的最小自燃临界温度.研究结果表明:抛光铝粉的氧化进程符合Arrhenius动力学机制，反应活化能为105.4kJ/mol;在试验室小尺寸网篮堆积状态下，铝粉的临界温度为215.5℃;当堆积尺度增大到工业现场集尘桶大小时，其值大幅下降至129℃.研究结果可为铝粉生产、储存和运输过程中自燃灾害的预防和控制提供理论参考.

Spontaneous Combustion Characteristics and Critical Conditions of Spontaneous Combustion of Polished Aluminum Powder Based on F-K Theory

The wire-mesh basket experiment was used to study the spontaneous combustion characteristics， the critical conditions of spontaneous combustion and the temporal and spatial distribution of temperature in the oxidation process of polished aluminum powder. According to the Frank-Kamenetskii(F-K)theory， the difference method and the cross-point temperature method were used to analyze the experimental data， calculate the oxidation reaction kinetic parameters and extrapolate the experimental results， and predict the minimum spontaneous combustion critical temperature at the industrial site accumulation scale. The research results show that the oxidation process of polished aluminum powder conforms to the Arrhenius kinetic mechanism， and the reaction activation energy is 105.4kJ/mol. The critical temperature of aluminum powder is 215.5℃ when the small size baskets are stacked in the laboratory. When the stacking size is increased to the size of the dust collecting bucket on the industrial site， the critical temperature drops to 129℃. The research results can provide a theoretical reference for the prevention and control of spontaneous combustion disasters during the production， storage and transportation processes of aluminum powder.