Citation

Jiang H, Bi M, Ma D, Li B, Cong H, Gao W. J. Hazard. Mater. 2019; 368: 797-810.

Affiliation

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

Copyright

(Copyright © 2019, Elsevier Publishing)

DOI

10.1016/j.jhazmat.2019.02.001

PMID

30743227

Abstract

The suppression effect of melamine cyanurate (MCA) and melamine polyphosphate (MPP) on the flame propagation of aluminum dust were studied experimentally. The results indicated that the concentration of MPP required to supress the aluminum dust explosion was lower than MCA. As the concentration of suppressant increased, the acceleration and the maximum flame speed extremely decreased, and the flame morphology became isolated spot flames. The MPP addition exerted a stronger suppression effect on the temperature of aluminum flame compared to MCA addition. Meanwhile, the mechanism of flame suppression was further investigated. Decomposition of MCA and MPP particles could absorb the heat released from the flame front. Scanning electron microscopy demonstrated that the gas phase reaction of aluminum particles was suppressed by MCA and MPP, resulting in a larger particle size of the explosion products. XRD results indicated that MCA and MPP did not react with aluminum. Gaseous products of suppressant decomposition altered flame chemistry by radically recombining O atom and reducing AlO, which resulted in less amount of heat release, lower flame speed and lower flame temperature.

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

Language: en

Keywords

Aluminum dust; Flame propagation behaviors; Flame temperatures; Suppression mechanism