Experimental study on the explosion destructive ability of magnesium powder/hydrogen hybrids in large space

• Published in: Process safety and environmental protection Vol. 173; pp. 237 - 248
• Main Authors: Xiong, Xinyu, Gao, Kai, Mu, Jie, Ji, Changquan, Li, Bin, Zhang, Dan, Xu, Yadong, Xie, Lifeng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2023
• Subjects: Flame development process; Large size explosion; Shock wave; Temperature field behavior; Unpremixed hybrid explosion; Temperature field behavior; Large size explosion; Flame development process; Shock wave; Unpremixed hybrid explosion
• ISSN: 0957-5820; 1744-3598
• DOI: 10.1016/j.psep.2023.02.091

During the production of magnesium products, it is easy to accumulate powder, which is very easy to derive hydrogen under humid conditions, forming hybrids explosion system. The effect of powder layer thickness on Pmax and flame development process of unpremixed magnesium powder/hydrogen hybrids was investigated by a 4.5 m3 large-size square device with a weak surface. It was found that the damage intensity caused by the explosion of hybrids was significantly greater than that of single-phase hydrogen, and increased with the increase of powder layer thickness. Compared with hydrogen explosion, with the increase of powder layer thickness in the hybrid system, the hydrogen explosion shock wave would roll up more powder to participate in the reaction. This can significantly increased the explosion pressure, the reaction time and the flame coverage area. Interestingly, the Pmax of hybrid explosion on the weak surface of device was instead larger than that on the closed side. In addition, when the weak surface of the device was destroyed, the shock wave would impact the rolled-up powder outside the device to react with oxygen. The flame release temperature was significantly increased, exceeding hydrogen explosion temperature by nearly 900 ℃, and the area covered by high temperature was larger. [Display omitted]