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An investigation on the aluminum dustexplosion suppression efficiency and mechanism of a NaHCO3/DE composite powder
Advanced Powder Technology ( IF 5.2 ) Pub Date : 2020-06-29 , DOI: 10.1016/j.apt.2020.06.014
Ke Yan , Xiangbao Meng

A NaHCO3/diatomaceous earth (DE) composite powder suppressant with unique clustered structures is prepared by high-pressure impact method, using DE as the carrier and NaHCO3 as the loaded chemical suppressant. The purpose is to obtain affordable, environmentally friendly, high-efficiency power explosion suppression materials. The suppression efficiencies of the NaHCO3/DE composite powder suppressant on aluminum dust propagation and explosion pressure are tested. The results show that as the content of the NaHCO3/DE composite powder suppressant increases, the maximum flame length gradually reduces and the suppression efficiency gradually increases. Addition of 60 wt% of the NaHCO3/DE composite powder suppressant suppress aluminum dust flame propagation and addition of 100 wt% of the NaHCO3/DE composite powder suppressant can fully suppress aluminum dust explosion. Comparison with pure NaHCO3 and pure DE reveals that NaHCO3/DE composite powder suppressant is more effective in suppressing aluminum dust flame propagation and aluminum dust explosion pressure than either of the two powders alone. The suppression mechanism of the NaHCO3/DE composite powder suppressant is established: On the one hand, reaction is suppressed by the decomposition of NaHCO3 and the product of this decomposition; on the other hand, as DE is rich in porous structures, when the loaded NaHCO3 powder separates from DE, the porous structures will not only limit flame propagation, but will also well adsorb the substances generated from explosion reaction.



中文翻译:

NaHCO 3 / DE复合粉体对铝粉尘爆炸的抑制作用及机理研究

以DE为载体,以NaHCO 3为负载的化学抑制剂,通过高压冲击法制备了具有独特簇状结构的NaHCO 3 /硅藻土(DE)复合粉末抑制剂。目的是获得负担得起的,环保的,高效的电力防爆材料。测试了NaHCO 3 / DE复合粉末抑制剂对铝粉尘传播和爆炸压力的抑制效果。结果表明,随着NaHCO 3 / DE复合粉末抑制剂含量的增加,最大火焰长度逐渐减小,抑制效率逐渐提高。添加60 wt%的NaHCO 3/ DE复合粉末抑制剂抑制铝粉尘的火焰蔓延,并且添加100重量%的NaHCO 3 / DE复合粉末抑制剂可以充分抑制铝粉尘爆炸。与纯NaHCO 3和纯DE的比较表明,NaHCO 3 / DE复合粉末抑制剂在抑制铝尘火焰传播和铝尘爆炸压力方面比单独使用两种粉末中的任何一种都更有效。建立了NaHCO 3 / DE复合粉末抑制剂的抑制机理:一方面,通过NaHCO 3的分解及其分解产物来抑制反应。另一方面,由于DE富含多孔结构,当负载的NaHCO 3 粉末与DE分离后,多孔结构不仅会限制火焰传播,还将很好地吸收爆炸反应产生的物质。

更新日期:2020-06-29
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