镁铝水滑石抑制聚乙烯粉尘爆炸特性与机理

纪文涛; 郭潇潇; 陈志滔; 蔡冲冲; 王燕

doi:10.11883/bzycj-2023-0263

镁铝水滑石抑制聚乙烯粉尘爆炸特性与机理

doi: 10.11883/bzycj-2023-0263

纪文涛^{1, 2, 3,},
郭潇潇^{1, 2, 3},
陈志滔^{1, 2, 3},
蔡冲冲^{1, 2, 3},
王燕^{1, 2, 3, ,}

1.
河南理工大学安全科学与工程学院，河南焦作 454000
2.
河南省燃爆动力灾害预警与应急工程技术研究中心，河南焦作 454000
3.
河南理工大学煤炭安全生产与清洁利用省部共建协同创新中心，河南焦作454000

基金项目: 国家自然科学基金（52374197）；国家重点研发计划“重大自然灾害防控与公共安全”重点专项（2022YFC3080700）；河南省优秀青年科学基金项目（212300410042）

详细信息

作者简介:
纪文涛（1989－　），男，博士，副教授，jiwentao@hpu.edu.cn

通讯作者:
王　燕（1982－　），女，博士，教授，yanwang@hpu.edu.cn

中图分类号: O389; X937
计量
- 文章访问数: 59
- HTML全文浏览量: 13
- PDF下载量: 13
- 被引次数: 0
出版历程
- 收稿日期: 2023-08-02
- 修回日期: 2023-10-30
- 网络出版日期: 2024-01-17
- 刊出日期: 2024-04-07

Suppression characteristics and mechanism of polyethylene dust explosion by Mg-Al hydrotalcite

JI Wentao^{1, 2, 3
,},
GUO Xiaoxiao^{1, 2, 3},
CHEN Zhitao^{1, 2, 3},
CAI Chongchong^{1, 2, 3},
WANG Yan^{1, 2, 3
, ,}

1.
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
2.
Explosion Dynamic Disaster Early Warning and Emergency Engineering Technology Research Center of Henan Province, Jiaozuo 454000, Henan, China
3.
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, Henan, China

摘要

摘要: 为寻求新型、清洁、高效的聚乙烯粉尘爆炸抑制剂，将镁铝水滑石用于聚乙烯粉尘爆炸抑制，并从爆炸超压和最低着火温度两方面，分析了镁铝水滑石抑制聚乙烯粉尘爆炸特性，并与氢氧化铝、氢氧化镁进行对比。结果表明，镁铝水滑石对聚乙烯粉尘爆炸超压和最低着火温度的抑制作用均优于氢氧化铝和氢氧化镁。在爆炸超压的抑制方面，在抑制比为2时，镁铝水滑石可完全抑制聚乙烯粉尘爆炸，而氢氧化铝和氢氧化镁对聚乙烯达到完全抑爆所需的抑制比分别为4和5。最低着火温度的抑制方面，抑制比为1时，镁铝水滑石可使聚乙烯粉尘的最低着火温度提高290 ℃，大于氢氧化铝的260 ℃和氢氧化镁的250 ℃。此外，结合镁铝水滑石的热解特性及红外光谱，从物理作用和化学作用两个方面对聚乙烯粉尘爆炸的抑制机理进行分析，揭示了阻断爆炸反应的进程。
- 镁铝水滑石 /
- 聚乙烯 /
- 抑爆特性 /
- 最低着火温度
Abstract: In order to find a new, clean and efficient inhibitor of PE dust explosion, the Mg-Al hydrotalcite was used to inhibit PE dust explosion by using standard 20 L spherical explosion test system and minimum ignition temperature test system of dust cloud. The inhibition properties of Mg-Al hydrotalcite for PE dust explosion are analyzed from the aspects of explosion overpressure and minimum ignition temperature, and are compared with aluminum hydroxide and magnesium hydroxide. The results showed that the inhibition effect of Mg-Al hydrotalcite on explosion overpressure and minimum ignition temperature of polyethylene dust is superior to that of aluminum hydroxide and magnesium hydroxide. In terms of explosion overpressure, when the inhibition ratio is 2, Mg-Al hydrotalcite can completely inhibit the explosion of polyethylene dust, while the inhibition ratios required for aluminum hydroxide and magnesium hydroxide to achieve complete explosion suppression of polyethylene are 4 and 5 respectively. With the increase of inhibition ratio, the maximum explosion pressure rise rate of polyethylene dust decreased. The inhibition effect of Mg-Al hydrotalcite on the explosion pressure rise rate of polyethylene dust is also better than that of aluminum hydroxide and magnesium hydroxide. In terms of minimum ignition temperature, when the inhibition ratio was 1, Mg-Al hydrotalcite increased the minimum ignition temperature of polyethylene dust to 710 ℃, which was 290 ℃ higher than that of pure polyethylene dust. Under the same conditions, aluminum hydroxide and magnesium hydroxide can increase the minimum ignition temperature of polyethylene dust by 260 ℃ and 250 ℃ respectively. Therefore, the inhibition effect of Mg-Al hydrotalcite on the minimum ignition temperature of polyethylene is also greater than that of aluminum hydroxide and magnesium hydroxide. In addition, the inhibition mechanism of Mg-Al hydrotalcite on polyethylene dust explosion was analyzed based on its pyrolysis characteristics and infrared spectra.The physical effect is mainly realized by absorbing heat from the reaction system and diluting the oxygen concentration. The chemical action is mainly achieved by the pyrolysis products carbon dioxide and water participating in and blocking the polyethylene explosion chain reaction.
- Mg-Al hydrotalcite /
- polyethylene /
- explosion suppression characteristic /
- minimum ignition temperature

HTML全文

图 1 镁铝水滑石结构图

Figure 1. Structure diagram of Mg-Al hydrotalcite

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图 2 20 L球形爆炸装置示意图

Figure 2. Diagram of 20 L spherical explosion test system

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图 3 粉尘云最低着火温度测试装置

Figure 3. Minimum ignition temperature test system of dust cloud

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图 4 4种粉体的粒径分布及扫描电镜图

Figure 4. Particle size distribution and scanning electron microscopy of four powders

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图 5 聚乙烯爆炸超压随粉尘质量浓度的变化规律

Figure 5. Variation of polyethylene explosion overpressure with dust mass concentration

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图 6 3种抑爆粉体作用下聚乙烯粉尘最大爆炸压力随抑制比的变化规律

Figure 6. Variation of the maximum explosion pressure of polyethylene dust with inhibition ratio under the action of three kinds of explosion suppression powders

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图 7 3种抑爆粉体作用下聚乙烯粉尘最大爆炸压力上升速率随抑制比的变化规律

Figure 7. Variation of the maximum explosion pressure rise rate of polyethylene dust with inhibition ratio under the action of three explosion suppression powders

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图 8 聚乙烯粉尘最低着火温度随粉尘质量浓度变化规律图

Figure 8. Variation of minimum ignition temperature of polyethylene dust with dust mass concentration

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图 9 3种抑爆粉体作用下聚乙烯粉尘最低着火温度随抑制比变化规律

Figure 9. Variation of minimum ignition temperature of polyethylene dust with inhibition ratio under the action of three explosion suppression powders

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图 10 氢氧化铝、氢氧化镁和镁铝水滑石粉体的热重曲线和DSC曲线

Figure 10. Thermogravimetric and DSC curves of Al(OH)₃, Mg(OH)₂ and (Mg_0.667Al_0.333)(OH)₂(CO₃)_0.167(H₂O)_0.5 powders

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图 11 混合粉体热重曲线

Figure 11. Thermogravimetric curves of mixed powders

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图 12 镁铝水滑石吸光度随波数变化规律图

Figure 12. Figure showing the variation of absorbance of Mg-Al hydrotalcite with wavenumber

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图 13 镁铝水滑石对聚乙烯粉尘爆炸的抑制机理

Figure 13. Mechanism of Mg-Al hydrotalcite suppressing polyethylene dust explosion

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