Citation

Gan B, Li B, Jiang H, Bi M, Gao W. J. Hazard. Mater. 2018; 351: 346-355.

Affiliation

School of Chemical Machinery and Safety Engineering, Dalian University of Technology, Dalian 116024, China. Electronic address: gaoweidlut@dlut.edu.cn.

Copyright

(Copyright © 2018, Elsevier Publishing)

DOI

10.1016/j.jhazmat.2018.03.017

PMID

29558658

Abstract

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 NaHCO₃improved the suppression effects of the ultrafine pure water mist. The improvement of explosion suppression by an 8% NaHCO₃mist 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.

Copyright © 2018 Elsevier B.V. All rights reserved.

Language: en

Keywords

Flame propagation behavior; Flame temperature; PMMA dust explosion; Suppression mechanism; Ultrafine water mist/additives