Inhibition effects of Al(OH)3 and Mg(OH)2 on Al-Mg alloy dust explosion |
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| Institution: | 1. Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110819, China;2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;3. Department of Process Engineering & Applied Science, Dalhousie University, Halifax, NS, Canada;4. Department of Civil Engineering, Shenyang Jianzhu University, Shenyang, 110168, China;5. State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology, Qingdao 266590, China;1. Fike Corporation, Industrial Protection Group, Blue Springs, USA;2. Fike Europe, Herentals, Belgium |
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| Abstract: | To identify a superior explosion suppressant for Al-Mg alloy dust explosion, the inhibition effects of Al(OH)3 and Mg(OH)2 powders on Al-Mg alloy explosion were investigated. A flame propagation suppression experiment was carried out using a modified Hartmann tube experimental system, an explosion pressure suppression experiment was carried out using a 20-L spherical explosion experimental system, and the suppression mechanisms of the two kinds of powders on Al-Mg alloy dust explosion were further investigated. The results demonstrate that by increasing the mass percentages of Al(OH)3 and Mg(OH)2, the flame height, flame propagation speed and explosion pressure of deflagration can be effectively reduced. When 80% Mg(OH)2 powder was added, the explosion pressure was reduced to less than 0.1 MPa, and the explosion was restrained. Due to the strong polarity of the surface of Mg(OH)2, agglomeration easily occurs; hence, when the added quantity is small, the inhibition effect is weaker than that of Al(OH)3. Because the Mg(OH)2 decomposition temperature is higher, the same quantity absorbs more heat and exhibits stronger adsorption of free radicals. Therefore, to fully suppress Al-Mg alloy explosion, the suppression effect of Mg(OH)2 powder is better. |
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| Keywords: | Al-Mg alloy Explosion Suppressant Flame propagation behavior Explosion pressure Inhibition mechanism |
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