Minimum ignition temperatures and explosion characteristics of micron-sized aluminium powder. (March 2020)

• Record Type: Journal Article
• Authors: Wang, Qiuhong; Fang, Xiang; Shu, Chi-Min; Wang, Qingfeng; Sheng, Youjie; Jiang, Juncheng; Sun, Yilin; Sheng, Zhongyi
• Is Part Of: Journal of loss prevention in the process industries. Volume 64(2020)
• Publication Date: 2020-03
• Subjects: Dust particle size -- Dust cloud concentration -- Ignition energy -- Explosion pressure -- Rate of explosion pressure rise; Chemical industries -- Safety measures -- Periodicals; 660.2804
• DOI: 10.1016/j.jlp.2020.104076
• Languages: English
• ISSNs: 0950-4230

Abstract

Abstract: To forestall, control, and mitigate the detrimental effects of aluminium dust, a 20-L near-spherical dust explosion experimental system and an HY16429 type dust-cloud ignition temperature test device were employed to explore the explosion characteristics of micron-sized aluminium powder under different ignition energies, dust particle sizes, and dust cloud concentration ( C dust ) values; the minimum ignition temperature (MIT) values of aluminium powder under different dust particle sizes and C dust were also examined. Flame images at different times were photographed by a high-speed camera. Results revealed that under similar dust-cloud concentrations and with dust particle size increasing from 42.89 to 141.70 μm, the MIT of aluminium powder increased. Under various C dust values, the MIT of aluminium dust clouds attained peak value when concentrations enhanced. Furthermore, the increase of ignition energy contributed to the increase of the explosion pressure ( P ex ) and the rate of explosion pressure rise [(d P /d t )ex ]. When dust particle size was augmented gradually, the P ex and (d P /d t )ex attenuated. Decreasing particle size lowered both the most violent explosion concentration and explosive limits. Highlights: 20-L near-spherical system and dust-cloud ignition temperature test device were employed. Flame images were taken under different C dust and time. MIT, P ex, and (d P /d t )ex of aluminum dust were investigated and elucidated. Particle size and C dust greatly influenced MIT. Fit the experimental data of P ex, (d P /d t )ex, and C dust.