Study on the inert effect of gas-solid two-phase composite system on aluminum dust explosion

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-06-10 DOI:10.1016/j.powtec.2025.121250

Runzhi Li , Yinghui Zhang , Mengting Cao , Xu Chen , Xiao Liu , Kaiyue Jia , Mingshuai Liu , Dechen Wang , Xiao Wang , Caihua Shi

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Abstract

The occurrence of aluminum dust explosion accidents, seriously damages the security of people's lives and property, restricting the healthy and sustainable development of related industries. To prevent the occurrence of aluminum dust explosion accidents, this study investigates the effects of three solid inert agents (Al₂O₃, NaH₂PO₄, Mg(OH)₂), two gas inert agents (CO₂, N₂), and gas-solid two-phase inert agents on the explosion characteristics of aluminum dust and reveals the inert mechanism. The results demonstrated that the Minimum Significant Inert Concentration of Al₂O₃, NaH₂PO₄, and Mg(OH)₂ for aluminum dust explosion were 170 %, 150 %, and 90 %, respectively, and the Minimum Complete Inert Concentration for aluminum dust explosion were 300 %, 290 %, and 350 %, respectively. When the inert concentration is lower than 150 %, the inert effect is Mg(OH)₂, NaH₂PO₄, and Al₂O₃ in descending order. When the inert concentration is higher than 150 %, the inert effect was NaH₂PO₄, Al₂O₃, and Mg(OH)₂ in descending order. For the same gradient of inert volume fraction, the decrease in the explosion pressure of aluminum dust is greater under CO₂ than under N₂. However, the inert effect is achieved by consuming large quantities of highly concentrated gas inert agents. The addition of gas-solid two-phase inert agents has a synergistic inert effect on the explosion pressure and pressure rise rate, which reduces the amount of solid inert agent and gas inert agent added. The inert mechanism of inert substances in the explosion of aluminum dust is dominated by physical inert. The study results will have important theoretical guidance for dust explosion protection.

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气固两相复合体系对铝尘爆炸的惰性作用研究

铝粉尘爆炸事故的发生，严重损害了人民生命财产安全，制约了相关产业的健康可持续发展。为防止铝尘爆炸事故的发生，研究了三种固体惰性剂（Al2O3、NaH2PO4、Mg(OH)2）、两种气体惰性剂（CO2、N2）和气固两相惰性剂对铝尘爆炸特性的影响，揭示了其惰性机理。结果表明，铝尘爆炸中Al2O3、NaH2PO4和Mg(OH)2的最小显著惰性浓度分别为170%、150%和90%，铝尘爆炸的最小完全惰性浓度分别为300%、290%和350%。当惰性浓度低于150%时，惰性效果依次为Mg(OH)2、NaH2PO4、Al2O3。当惰性浓度大于150%时，NaH2PO4、Al2O3、Mg(OH)2的惰性作用依次递减。在相同的惰性体积分数梯度下，CO2条件下铝粉尘爆炸压力的下降幅度大于N2条件下。然而，惰性效果是通过消耗大量高浓度气体惰性剂来实现的。气固两相惰性药剂的添加对爆炸压力和升压速率有协同惰性作用，减少了固体惰性药剂和气体惰性药剂的添加量。铝粉尘爆炸中惰性物质的惰性机理以物理惰性为主。研究结果对粉尘爆炸防护具有重要的理论指导意义。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.