Citation

Huang C, Chen X, Yuan B, Zhang H, Dai H, He S, Zhang Y, Niu Y, Shen S. J. Hazard. Mater. 2019; 378: e120723.

Affiliation

Institute of Public Safety Research, Tsinghua University, Beijing, 100084, China; Department of Engineering Physics, Tsinghua University, Beijing, 100084, China.

Copyright

(Copyright © 2019, Elsevier Publishing)

DOI

10.1016/j.jhazmat.2019.05.116

PMID

31216501

Abstract

The suppression effects of ultrafine Mg (OH)₂ powders with different particle sizes and mass fractions on explosion flame of wood dust are experimentally studied in a half-closed vertical experimental duct. Flame structures and characteristic parameters, including flame light emission images, propagation velocity, temperature, during the flame propagation of wood dust explosion are recorded by high-speed photography and fine thermocouple. Thermal decomposition behaviors of wood dust and Mg(OH)₂ powders are studied using synchronous thermal analyzer. Chemical structures of residual dust samples after the explosion are characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The experimental results show that explosion flame of wood dust is obviously suppressed by physical and chemical effects of Mg(OH)₂ powders, and the suppression effect of nano-Mg(OH)₂ is better than that of micron-Mg(OH)₂ under same mass fractions. By analyzing multiple characteristics of nano-powders, the advantages of nano-Mg(OH)₂ over micron-powders are further investigated.

Copyright © 2019 Elsevier B.V. All rights reserved.

Language: en

Keywords

Explosion suppression; Flame propagation; Ultrafine Mg(OH)(2); Wood dust explosion