期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 378, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.05.116
关键词
Wood dust explosion; Flame propagation; Ultrafine Mg(OH)(2); Explosion suppression
资金
- National Key Research and Development Program of China [2016YFC0802807]
- National Natural Science Foundation of China [51774221, 51703175]
- Fundamental Research Funds for the Central Universities [195261002, 195161009]
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.
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