Experimental exploration of methane-coal dust explosion suppression by expandable graphite: From the point of view of pressure, flame, spectrum, and flow field

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL Process Safety and Environmental Protection Pub Date : 2024-10-22 DOI:10.1016/j.psep.2024.10.067

Haiyan Wang , Yanwei Zhang , Siyu Tian , Yang Hu , Jingde Xu

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Abstract

Expandable graphite (EG) has been proposed as a more efficient material for suppressing methane-coal dust explosions. The suppression effect was evaluated based on pressure, flame, spectrum, and flow field. The influence of particle size, expansion ratio, and suppressant concentration on the suppression effect was considered, and the suppression mechanism was analyzed. The explosion characteristics and OH* emission spectrum indicated that EG effectively suppressed methane-coal dust explosions. Higher concentrations, smaller particle sizes, and higher expansion ratios resulted in a stronger suppression effect. The influence of EG parameters on suppression effectiveness was ranked from highest to lowest in terms of the concentration, particle size, and expansion ratio. Schlieren imaging showed that EG can partially suppress the initial flame. However, the significant suppression effect occurs during the pressure-increase stage. The flow field was also analyzed using proper orthogonal decomposition. The results showed that EG suppressed flow-field fluctuations, with the mode coefficient trends aligned closely with the pressure-change curve.

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可膨胀石墨抑制甲烷-煤尘爆炸的实验探索：从压力、火焰、光谱和流场的角度来看

有人提出可膨胀石墨（EG）是抑制甲烷-煤尘爆炸的一种更有效的材料。根据压力、火焰、光谱和流场对抑制效果进行了评估。考虑了粒度、膨胀比和抑制剂浓度对抑制效果的影响，并分析了抑制机理。爆炸特性和 OH* 发射光谱表明，EG 能有效抑制甲烷-煤尘爆炸。浓度越高、粒径越小、膨胀比越大，抑制效果越强。EG 参数对抑制效果的影响从大到小依次为浓度、粒度和膨胀比。Schlieren 成像显示，EG 可以部分抑制初始火焰。但是，在压力增加阶段，抑制效果明显。此外，还利用适当的正交分解对流场进行了分析。结果表明，EG 可抑制流场波动，其模式系数趋势与压力变化曲线密切相关。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.