Three types of self‐prepared chemical dust suppressants (CDSs) were investigated for their inhibitory effects on nitrocellulose (NC) cloud dust explosion. The results revealed that NC is extremely sensitive to electric sparks and has a high explosion intensity. CaCl₂‐CDS effectively increased the particle size to control fly dust substantially inhibiting dust cloud explosions. However, both Na₂SO₄‐CDS and MgCl₂‐CDS exhibited poor abilities and even promoted explosion. Therefore, neither Na₂SO₄‐CDS nor MgCl₂‐CDS is recommended as a CDS for NC. Inappropriately using CDSs may engender severe explosions. Furthermore, a mechanism underlying NC dust cloud combustion and explosion was proposed. NC has three stages of heat release: autoxidation, thermal decomposition, and combustion. Thermal decomposition, combustion, and explosion were triggered depending on the energy provided from autoxidation. CaCl₂‐CDS inhibited only combustion. This study reveals the mechanism underlying NC dust cloud explosions and provides useful information for the development of more optimized CDSs.

中文翻译：

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三种化学抑尘剂对硝化纤维素尘云爆炸的抑制作用

研究了三种自行制备的化学粉尘抑制剂（CDS）对硝化纤维素（NC）云尘爆炸的抑制作用。结果表明，NC对电火花极为敏感，爆炸强度高。CaCl ₂ -CDS有效地增加了粒径，从而控制了粉尘，从而大大抑制了粉尘云的爆炸。但是，Na ₂ SO ₄ -CDS和MgCl ₂ -CDS均显示出较差的能力，甚至促进爆炸。因此，无论是Na ₂ SO ₄ -CDS还是MgCl ₂‐CDS建议用作NC的CDS。不当使用CDS可能会引起严重爆炸。此外，提出了数控尘埃云燃烧爆炸的机理。NC具有放热三个阶段：自氧化，热分解和燃烧。根据自氧化提供的能量触发热分解，燃烧和爆炸。CaCl ₂ -CDS仅抑制燃烧。这项研究揭示了NC尘云爆炸的潜在机制，并为开发更优化的CDS提供了有用的信息。