Abstract: This study mainly utilizes a designed and modified spontaneous combustion testing device for accumulated aluminum dust and a testing platform for basic dust parameters, combined with theoretical analysis to investigate the development patterns of spontaneous combustion characteristics of accumulated aluminum dust under different factors. Research has shown that as the initial ambient temperature increases, the induction time of accumulated aluminum dust decreases, while the ignition delay time decreases; As the initial particle size increases, the delay period of accumulated aluminum dust gradually lengthens, and the induction period of dust spontaneous combustion also basically lengthens; The aluminum powder dust layers with a stacking thickness of 2, 3 cm all experienced spontaneous combustion, but the aluminum powder dust layer with a stacking thickness of 1 cm did not undergo spontaneous combustion. For the dust that ultimately underwent spontaneous combustion, the induction time and ignition delay time decreased with the increase of stacking thickness; According to the Semenov combustion theory, a theoretical calculation and estimation of the critical temperature were conducted, and the results were compared with experimental test values. The results were in good agreement, proving the accuracy of the experimental testing equipment and the feasibility of theoretical approximate calculations.

Key words: accumulation of aluminum dust, spontaneous combustion mechanism, dust spontaneous combustion, ignition delay time