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Multiple effects of high efficiency solid inertants on fire hazard of the accumulated Mg dust layer

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  • Meng, Fanyi
  • Luo, Zhenmin
  • Yu, Yingying
  • Wang, Tao
  • Su, Bin
  • Yuan, Chunmiao
  • Li, Gang
  • Hou, Xiaochen

Abstract

Due to low melting and boiling points and extreme reactivity in the chemical reaction of Mg powder, inert powders that have a significant inerting effect on Mg dust clouds can cause significant combustion enhancement of the accumulated Mg dust layer. To circumvent this unforeseen fire hazard, this research selects five types of inertants that have been demonstrated to exert an inerting effect on metal dust clouds and possess a potential flame-retardant effect on Mg dust layers. This research aims to investigate the effect of inert powders on Mg dust layers to identify an efficient inerting mechanism for Mg dust layers. The results indicate that the selection of inertants for Mg dust must be based on a comprehensive evaluation of their physical and chemical properties. The presence of substances with strong decomposition and decomposition products that readily produce gases will destroy the oxide crust on the surface of the accumulated Mg dust layer, thereby causing violent gas-phase combustion. In the case of highly chemically stable substances, the melting point is of primary importance. The formation of cracks in the oxide crust is also a consequence of the higher melting point of inertants, resulting in a combustion enhancement of the mixed dust layer. Inertants with a low melting point and a high boiling point demonstrate a high degree of inerting efficiency for Mg dust layers. The melting of the inert substances forms a liquid film, which prevents the Mg powder from coming into contact with the air surrounding and within the combustion zone. The results of this research are both instructive and valuable for preventing explosions in the process industry involving metal dust materials.

Suggested Citation

  • Meng, Fanyi & Luo, Zhenmin & Yu, Yingying & Wang, Tao & Su, Bin & Yuan, Chunmiao & Li, Gang & Hou, Xiaochen, 2024. "Multiple effects of high efficiency solid inertants on fire hazard of the accumulated Mg dust layer," Energy, Elsevier, vol. 313(C).
    • Handle: RePEc:eee:energy:v:313:y:2024:i:c:s0360544224035850
    DOI: 10.1016/j.energy.2024.133807
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    1. Chen, Jian & Chen, Wukun & Dong, Ruixing & Shi, Jihao & Zhang, Yanni & Wang, Weilin & Zhou, Kuibin, 2025. "Experimental study on fire thermal characteristics of flammable gases leakage underwater," Energy, Elsevier, vol. 316(C).

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