期刊
POWDER TECHNOLOGY
卷 392, 期 -, 页码 402-411出版社
ELSEVIER
DOI: 10.1016/j.powtec.2021.07.034
关键词
Dust explosion venting; External flame; Pressure characteristics; Venting sizing guidance
资金
- Natural Science Foundation of China [51922025, 51874066]
- Science and Technology Major Project of Liaoning Province [2019JH1/10300002]
- Elite Foundation of Revitalizing Liaoning [XLYC1907161]
The study focused on flame behavior and overpressure characteristics at different dust concentrations and static activation pressures. Lowering dust concentration helps to mitigate external flame, while blindly reducing static activation pressure poses greater risk. Analysis was also conducted on reduced explosion pressure inside the chamber.
Vented PMMA dust explosions were conducted in a 20-L spherical chamber with a venting diameter of 80 mm. The flame behaviors and overpressure characteristics at different dust concentrations and static activation pressure were studied. The development mechanism of external flame and the comparison results with two standards were analyzed. The results showed the reduction of dust concentration was necessary for mitigating the external flame, while blindly decreased the static activation pressure would bring greater risk. The characteristics of reduced explosion pressure inside the chamber were analyzed combined with external pressure. Then the rupture mechanism of the venting diaphragm was established based on the elastoplastic analysis. Two empirical modified equation for NFPA68 and EN14491 was established. For NFPA68, the volume correction coefficient of size effect was introduced and the inapplicability of NFPA68 at elevated static activation pressure was attributed to ignoring the compressibility and the choking phenomenon of high-speed fluid. (c) 2021 Elsevier B.V. All rights reserved.
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