Suppression characteristics and mechanism of polyethylene dust explosion by Mg‑Al hydrotalcite

被引：0
|
作者：
Ji W. [1 ,2 ,3 ]
Guo X. [1 ,2 ,3 ]
Chen Z. [1 ,2 ,3 ]
Cai C. [1 ,2 ,3 ]
Wang Y. [1 ,2 ,3 ]
机构：
[1] College of Safety Science and Engineering, Henan Polytechnic University, Henan, Jiaozuo
[2] Explosion Dynamic Disaster Early Warning and Emergency Engineering Technology Research Center of Henan Province, Henan, Jiaozuo
[3] Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Henan Polytechnic University, Henan, Jiaozuo
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2024年 / 44卷 / 04期
关键词：
explosion suppression characteristic; Mg-Al hydrotalcite; minimum ignition temperature; polyethylene;
D O I：
10.11883/bzycj-2023-0263
中图分类号：
学科分类号：
摘要：
In order to find a new, clean and efficient inhibitor of PE dust explosion, the Mg-Al hydrotalcite was used to inhibit PE dust explosion by using standard 20 L spherical explosion test system and minimum ignition temperature test system of dust cloud. The inhibition properties of Mg-Al hydrotalcite for PE dust explosion are analyzed from the aspects of explosion overpressure and minimum ignition temperature, and are compared with aluminum hydroxide and magnesium hydroxide. The results showed that the inhibition effect of Mg-Al hydrotalcite on explosion overpressure and minimum ignition temperature of polyethylene dust is superior to that of aluminum hydroxide and magnesium hydroxide. In terms of explosion overpressure, when the inhibition ratio is 2, Mg-Al hydrotalcite can completely inhibit the explosion of polyethylene dust, while the inhibition ratios required for aluminum hydroxide and magnesium hydroxide to achieve complete explosion suppression of polyethylene are 4 and 5 respectively. With the increase of inhibition ratio, the maximum explosion pressure rise rate of polyethylene dust decreased. The inhibition effect of Mg-Al hydrotalcite on the explosion pressure rise rate of polyethylene dust is also better than that of aluminum hydroxide and magnesium hydroxide. In terms of minimum ignition temperature, when the inhibition ratio was 1, Mg-Al hydrotalcite increased the minimum ignition temperature of polyethylene dust to 710 ℃, which was 290 ℃ higher than that of pure polyethylene dust. Under the same conditions, aluminum hydroxide and magnesium hydroxide can increase the minimum ignition temperature of polyethylene dust by 260 ℃ and 250 ℃ respectively. Therefore, the inhibition effect of Mg-Al hydrotalcite on the minimum ignition temperature of polyethylene is also greater than that of aluminum hydroxide and magnesium hydroxide. In addition, the inhibition mechanism of Mg-Al hydrotalcite on polyethylene dust explosion was analyzed based on its pyrolysis characteristics and infrared spectra.The physical effect is mainly realized by absorbing heat from the reaction system and diluting the oxygen concentration. The chemical action is mainly achieved by the pyrolysis products carbon dioxide and water participating in and blocking the polyethylene explosion chain reaction. © 2024 Explosion and Shock Waves. All rights reserved.
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