School of Chemical Machinery and Safety Engineering, Dalian University of Technology, Dalian 116024, China.
School of Chemical Machinery and Safety Engineering, Dalian University of Technology, Dalian 116024, China.
J Hazard Mater. 2018 Jun 5;351:346-355. doi: 10.1016/j.jhazmat.2018.03.017. Epub 2018 Mar 10.
The suppressions of ultrafine water mists containing additives (NaCl and NaHCO) 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 NaHCO improved the suppression effects of the ultrafine pure water mist. The improvement of explosion suppression by an 8% NaHCO 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.
实验研究了在粉尘爆炸装置中添加（NaCl 和 NaHCO）的超细水雾对 100nm、5μm 和 30μm 聚甲基丙烯酸甲酯（PMMA）粉尘爆炸的抑制作用。高速摄影显示，超细水雾/添加剂的抑制作用显著降低了最大垂直位置和火焰传播速度。超细纯水雾抑制的 100nm、5μm 和 30μm 粉尘爆炸的火焰传播速度分别降低了 48.2%、27.7%和 15.3%。通过细热电偶测量的纳米和微 PMMA 粉尘爆炸中的最大温度和升温速率也显著降低。证明了 NaCl 和 NaHCO 的添加提高了超细纯水雾的抑制效果。8%NaHCO 雾的爆炸抑制效果优于 16%NaCl 雾。通过分析物理和化学效应进一步讨论了超细水雾/添加剂的抑制机理。
