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Fire suppression performance of a new type of composite superfine dry powder

机译：新型复合超细干粉的灭火性能

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摘要

To enhance the performance of existing dry powders and ensure process security, a new type of dry powder based on ammonium dihydrogen phosphate (NH4H2PO4) was prepared. The prepared composite superfine dry powder was denoted as NH4H2PO4/zeolite composite in this paper. The effectiveness of commercial ABC dry powder, superfine dry powder, and the NH4H2PO4/zeolite composite in fire suppression were compared in a small-sized fire-extinguishing chamber. Laboratory-scale tests showed that the NH4H2PO4/zeolite composite had considerably superior fire-extinguishing efficiency to that of commercial ABC dry powder and superfine dry powder, along with shorter average extinguishing time and less average mass of powders consumed. In addition, the NH4H2PO4/zeolite composite also displayed much improved toxic gas suppression ability. The physical and chemical characteristics of commercial ABC dry powder, superfine dry powder, and the NH4H2PO4/zeolite composite were characterized using a range of techniques of laser particle size analysis, scanning electron microscopy, thermogravimetric analysis, and differential scanning calorimetry. Based on the analysis results, the improved fire suppression performance of the NH4H2PO4/zeolite composite can be ascribed to smaller particle size, larger surface area, and a special chemical decomposition process.
机译：为了提高现有干粉的性能并确保过程安全性，制备了一种新型的基于磷酸二氢铵（NH4H2PO4）的干粉。制备的复合超细干粉为NH4H2PO4 /沸石复合材料。在小型灭火室内比较了商用ABC干粉，超细干粉和NH4H2PO4 /沸石复合材料在灭火中的效果。实验室规模的测试表明，NH4H2PO4 /沸石复合材料具有比商用ABC干粉和超细干粉更好的灭火效率，并且平均灭火时间更短，平均消耗的粉剂更少。此外，NH4H2PO4 /沸石复合材料还显示出大大改善的有毒气体抑制能力。商业ABC干粉，超细干粉和NH4H2PO4 /沸石复合材料的物理和化学特性使用一系列激光粒度分析，扫描电子显微镜，热重分析和差示扫描量热法进行了表征。根据分析结果，可以将NH4H2PO4 /沸石复合材料的防火性能提高归因于较小的粒径，较大的表面积和特殊的化学分解过程。

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  • 来源
    《Fire and materials》 |2019年第8期|905-916|共12页
  • 作者

    Li Hangchen; Feng Li; Du Dexu; Guo Xinxin; Hua Min; Pan Xuhai;

  • 作者单位

    Nanjing Tech Univ Coll Safety Sci & Engn Nanjing 210009 Jiangsu Peoples R China;

    Nanjing Tech Univ Coll Safety Sci & Engn Nanjing 210009 Jiangsu Peoples R China|Nanjing Tech Univ Inst Fire Sci & Engn Nanjing 210009 Jiangsu Peoples R China;

    Nanjing Tech Univ Coll Safety Sci & Engn Nanjing 210009 Jiangsu Peoples R China|Jiangsu Key Lab Urban & Ind Safety Nanjing 210009 Jiangsu Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    compound; dry powder; extinction efficiency; extinguishing mechanism; toxic gas;

    机译：复合;干燥的粉;消光效率灭火机制;有毒气体;

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