工业甲醇-聚乙烯醇两相体系爆炸危险性的实验研究

IF 4.2 3区工程技术 Q2 ENGINEERING, CHEMICAL

Journal of Loss Prevention in The Process Industries Pub Date : 2025-09-20 DOI:10.1016/j.jlp.2025.105808

Qi Lan , Liangliang Li , Zhengang Wang , Yipeng Li , He Meng , Xiaolei Bi , Bin Tao , Shiqiang Wang

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引用次数: 0

摘要

聚乙烯醇（PVA）在生产、储存和包装过程中，甲醇可能挥发形成甲醇/聚乙烯醇粉尘两相体系，具有较高的爆炸危险性。为填补甲醇/PVA粉尘体系爆炸特性研究空白，采用改进的20L爆炸球装置，研究了不同浓度甲醇-PVA两相体系爆炸下限（LEL）、爆炸强度、最小点火能（MIE）等爆炸参数的变化规律。甲醇的加入显著降低了PVA粉尘的LEL。当甲醇浓度从0%增加到5%时，PVA粉尘的最小爆炸浓度从150 g m−3降低到10 g m−3。根据实验结果，提出了不同甲醇浓度下气固体系MIE的经验公式。随着甲醇气体浓度的增加，两相体系的MIE急剧下降。当甲醇含量超过10%时，两相系统的MIE可低至2-3 mJ，低于非金属包装袋与接地金属表面之间常见的电刷放电能量。随着甲醇添加浓度的增加，两相体系的爆炸压力先升高后降低。当PVA粉尘浓度较低时，爆炸压力显著升高。而当PVA粉尘浓度超过最佳爆炸浓度时，爆炸压力曲线趋于平缓，甲醇浓度对两相体系爆炸压力的影响减小，爆炸压力增幅不超过0.05 MPa。随着甲醇浓度的增加，两相体系的最大爆炸压力上升率呈连续上升趋势。研究结果对工业粉尘爆炸的防治具有重要的参考价值。

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Experimental study on explosion hazard of methanol-polyvinyl alcohol two-phase system in industrial processes

During the production, storage, and packaging of polyvinyl alcohol (PVA), methanol may volatilize to form a methanol/PVA dust two-phase system, posing a high risk of explosion. To fill the research gap on the explosion characteristics of methanol/PVA dust systems, the variation laws of explosion parameters such as the lower explosion limit (LEL), explosion intensity, and minimum ignition energy (MIE) of methanol-PVA two-phase systems at different concentrations were studied using a modified 20L explosion sphere device. The addition of methanol significantly reduced the LEL of PVA dust. When the methanol concentration increased from 0 % to 5 %, the minimum explosion concentration of PVA dust decreased from 150 g m⁻³ to 10 g m⁻³. Based on the experimental results, an empirical formula for the MIE of the gas-solid system at different methanol concentrations was proposed. The MIE of the two-phase system decreased sharply with the increase in methanol gas concentration. When the methanol content exceeded 10 %, the MIE of the two-phase system could be as low as 2–3 mJ, which is lower than the brush discharge energy commonly seen between non-metallic packaging bags and grounded metal surfaces. The explosion pressure of the two-phase system first increased and then decreased with the increase in the added methanol concentration. When the PVA dust concentration was low, the explosion pressure increased significantly. However, when the PVA dust concentration exceeds the optimal explosion concentration, the explosion pressure curve levels off, and the influence of methanol concentration on the explosion pressure of the two-phase system diminishes, with the explosion pressure increase not exceeding 0.05 MPa. The maximum rate of explosion pressure rise of the two-phase system showed a continuous upward trend with the increase in methanol concentration. The results hold significant reference value for the prevention and control of industrial dust explosions.

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来源期刊

Journal of Loss Prevention in The Process Industries 工程技术-工程：化工

CiteScore

7.20

自引率

14.30%

发文量

226

审稿时长

52 days

期刊介绍： The broad scope of the journal is process safety. Process safety is defined as the prevention and mitigation of process-related injuries and damage arising from process incidents involving fire, explosion and toxic release. Such undesired events occur in the process industries during the use, storage, manufacture, handling, and transportation of highly hazardous chemicals.