CIESC Journal ›› 2023, Vol. 74 ›› Issue (8): 3608-3614.DOI: 10.11949/0438-1157.20230598

• Process safety • Previous Articles    

The microscopic mechanism on MPP inhibiting explosion of Al-Mg alloy powder

Zhenbao LI1(), Chao LI1, Hu WANG1(), Shaorui WANG1, Quan LI2   

  1. 1.College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
    2.School of Electronic Information Engineering, Lanzhou Institute of Technology, Lanzhou 730050, Gansu, China
  • Received:2023-06-19 Revised:2023-07-28 Online:2023-10-18 Published:2023-08-25
  • Contact: Hu WANG

MPP抑制铝镁合金粉尘爆炸微观机理研究

李珍宝1(), 李超1, 王虎1(), 王绍瑞1, 黎泉2   

  1. 1.兰州理工大学石油化工学院,甘肃 兰州 730050
    2.兰州工业学院电子信息工程学院,甘肃 兰州 730050
  • 通讯作者: 王虎
  • 作者简介:李珍宝(1987—),男,博士,副教授,lizb@lut.edu.cn
  • 基金资助:
    甘肃省优秀研究生“创新之星”项目(2023CXZX-426);甘肃省青年科技基金项目(23JRRA833);甘肃省重点研发计划项目(22YF7FA134)

Abstract:

There is a certain explosion risk in the polishing process of Al-Mg alloy. To reduce the damage of explosion accident on Al-Mg alloy powder, melamine polyphosphate (MPP) was selected to study the suppression mechanism of Al-Mg alloy powder explosion. The effect of MPP on the dust explosion characteristics of aluminum-magnesium alloy was analyzed by using 20 L explosion ball and thermal analysis experiment. Combined with the chemical composition analysis and the functional group change of the explosion products, the mechanism on MPP inhibiting the explosion of Al-Mg alloy powder was analyzed. The results show that the addition of 70% (mass) MPP in Al-Mg alloy dust can achieve complete explosion suppression. It was endothermic during MPP decomposition and inert gases (NH3, H2O, and CO2) were generated for reducing oxygen concentration. In this process, the polyphosphate transformed to phosphoric acid, which can reacts with the active group. The effect of MPP on inhibiting the oxidation of Al to form AlO groups is obviously better than that on inhibiting the oxidation reaction of Mg. The results can provide theoretical basis for industrial prevention on explosion accident of Al-Mg alloy powder.

Key words: powder, explosion, secure, Al-Mg alloy powder, explosion suppressor, explosion characteristic

摘要:

铝镁合金在抛光打磨过程中,存在一定的粉尘爆炸危险性。为了减小铝镁合金粉尘爆炸事故的危害,选取三聚氰胺聚磷酸盐(MPP)对铝镁合金粉尘的抑爆特性进行研究。利用20 L爆炸球及热分析实验,分析MPP对铝镁合金粉尘爆炸特性的抑制效果。结合爆炸产物化学成分分析和官能团变化情况,分析MPP抑制铝镁合金粉尘爆炸机理。研究结果表明,70%(质量)的MPP添加量的铝镁合金粉尘可实现完全抑爆。MPP分解反应本身为吸热反应,生成惰性气体NH3、H2O和CO2,降低了反应体系的氧浓度。抑爆过程中,聚磷酸本身还原成磷酸,反应生成物可与活性基团反应。MPP抑制Al氧化生成AlO基团的效果,明显优于其抑制Mg的氧化反应。研究结果为铝镁合金粉尘事故工业预防提供数据支撑及理论依据。

关键词: 粉体, 爆炸, 安全, 铝镁合金粉尘, 抑爆剂, 爆炸特性

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