Combustion behaviors and explosibility of suspended metal hydride TiH2 dust. (17th April 2020)

• Record Type: Journal Article
• Authors: Cheng, Yang-Fan; Wu, Hong-Bo; Liu, Rong; Yao, Yu-Le; Su, Jian; Wang, Wen-Tao; Shu, Chi-Min
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 21(2020)
• Page Start: 12216
• Page End: 12224
• Publication Date: 2020-04-17
• Subjects: Dust explosion -- Hydrogen energy -- Flame propagation speed -- Explosion index -- Metal hydride; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.02.137
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In the production and storage processes of metal hydride material of TiH2, there are at least three kinds of explosion hazards, for example, TiH2 dust explosion, H2 explosion and hybrid H2 /TiH2 dust explosion. In this study, combustion behaviors of TiH2 dust cloud under isobaric and isochoric conditions were studied using a visual dust combustion facility and a standard 20-L spherical explosion vessel bomb, respectively, and Ti dust and hybrid H2 /Ti dust were used as the reference materials. Experimental results showed that at equal dust concentrations, the flame propagation speed S f, burning velocity S L, maximum pressure rise P ex and maximum rate of pressure rise (d P /d t )ex of TiH2 dust were all higher than those of Ti dust, while much smaller than those of hybrid H2 /Ti dust except the maximum pressure rise P ex . The hydrogen state and content were the primary factors for the combustion differences of dust explosions. The values of explosion index K st showed that the explosion risks of these samples increased as follows: Ti ˂ TiH2 ˂ hybrid H2 /Ti dust. Highlights: Combustion characterizations of TiH2 dust were studied with isobaric balloons. Effects of hydrogen state and content on explosion characteristics were studied. Explosibility of TiH2 dust, Ti dust and hybrid H2 /Ti had been investigated.