Dust cloud explosion characteristics and mechanisms in MgH₂‐based hydrogen storage materials

Abstract

The mechanisms involved in premixed magnesium and hydrogen hybrid and synthetic MgH2 dust cloud explosions were investigated. The results revealed that trace amounts of H2 in Mg explosions can markedly increase explosion severity. Furthermore, H2 addition can weaken the influence of oxygen deficiency on Mg explosion. Moreover, the explosion intensity of synthetic MgH2 was far stronger than that of premixed Mg/H2 mixture or Mg alone because the vacancy defects in Mg and H atoms can form after dehydrogenation of MgH2, which caused that Mg and H2 are prone to oxidation and nitrification in air atmosphere at a low temperature, thereby promoting the explosion. This demonstrates that the explosion risk of MgH2 (even other H2 storage materials) is related to its H2 storage capacity and dehydrogenation temperature. Therefore, for H2 storage materials, the better H2 storage performances can exhibit higher explosion risks.

Impact of Hydrogen Injection on Natural Gas Measurement

“…In particular, hydrogen enrichment strongly induces non-linear effects in terms of burning velocity, interaction of the propagating flame with the turbulent flow field and, consequently, explosion behaviour [3]. The major risk associated with hydrogen is the possibility of having explosive atmosphere conditions, which has been demonstrated by numerous studies on explosive characteristics dust and gas hydrides [4]. As a consequence, hydrogen is more hazardous and more susceptible to deflagration-to-detonation transition than hydrocarbons.…”

Assessing Uncertainties of Life-Cycle CO2 Emissions Using Hydrogen Energy for Power Generation

“…In the future, it may be necessary to conduct similar analyses of lignite gasification and hydrogen production using domestic resources to examine various possibilities for realizing a low-carbon energy system through hydrogen energy. Similarly, we note that conducting life-cycle analysis to include economic, social, and other environmental impacts as a part of multiple criteria analyses will also be increasingly important for the deliberation of hydrogen's potential role as an energy medium [58][59][60][61].…”

Unlocking dynamics of compact methanol reformers during on‐line catalyst activation using transient computational fluid dynamics simulation

“…A viable solution to large-scale accommodation of the renewable electricity is utilization of energy-carrying chemicals, such as hydrogen and methanol. [1][2][3][4][5] An essential obstacle to expansion of the applications of hydrogen fuels in the transport sector is the massive volume or pressure of portable hydrogen storage equipment due to the low volumetric energy density of hydrogen. 6 In this respect, introducing fuel cell vehicles (FCV) with combination of on-board methanol reforming for hydrogen production and hydrogen fuel cells is considered a practical scheme to resolve the hydrogen transportation and storage issues for vehicle use.…”

“…Deployment of a high proportion of renewable electricity requires effective means to tackle its intrinsic intermittency and volatility. A viable solution to large‐scale accommodation of the renewable electricity is utilization of energy‐carrying chemicals, such as hydrogen and methanol 1–5 . An essential obstacle to expansion of the applications of hydrogen fuels in the transport sector is the massive volume or pressure of portable hydrogen storage equipment due to the low volumetric energy density of hydrogen 6 .…”