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Suppression of polymethyl methacrylate dust explosion by ultrafine water mist/additives
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2018-03-10 , DOI: 10.1016/j.jhazmat.2018.03.017
Bo Gan , Bei Li , Haipeng Jiang , Mingshu Bi , Wei Gao

The suppressions of ultrafine water mists containing additives (NaCl and NaHCO3) on 100 nm, 5 μm, and 30 μm polymethyl methacrylate (PMMA) dust explosions were experimentally studied in a dust-explosion apparatus. High-speed photography showed that maximum vertical positions and flame propagation velocities were significantly decreased by suppression with ultrafine water mist/additives. Flame propagation velocities in 100 nm, 5 μm, and 30 μm dust explosions suppressed by the ultrafine pure water mist were reduced by 48.2%, 27.7%, and 15.3%, respectively. Maximum temperatures and temperature rising rates measured by a fine thermocouple in nano- and micro-PMMA dust explosions were also significantly decreased. It was proved that the addition of NaCl and NaHCO3 improved the suppression effects of the ultrafine pure water mist. The improvement of explosion suppression by an 8% NaHCO3 mist was superior to that of a 16% NaCl mist. The suppression mechanisms of ultrafine water mist/additives are further discussed by analyzing the physical and chemical effects.



中文翻译:

超细水雾/添加剂抑制聚甲基丙烯酸甲酯粉尘爆炸

在粉尘爆炸装置中,通过实验研究了含有添加剂(NaCl和NaHCO 3)的超细水雾在100 nm,5μm和30μm聚甲基丙烯酸甲酯(PMMA)粉尘爆炸的抑制作用。高速摄影表明,通过超细水雾/添加剂的抑制作用,最大垂直位置和火焰传播速度显着降低。超细纯水雾抑制的100 nm,5μm和30μm尘埃爆炸的火焰传播速度分别降低了48.2%,27.7%和15.3%。通过精细热电偶测量的纳米级和微米级PMMA尘埃爆炸中的最高温度和升温速率也显着降低。事实证明,NaCl和NaHCO 3的添加改善了超细纯水雾的抑制效果。8%NaHCO 3雾对爆炸抑制的改善优于16%NaCl雾对爆炸的抑制。通过分析其物理和化学作用,进一步讨论了超细水雾/添加剂的抑制机理。

更新日期:2018-03-10
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