Thermal decomposition characteristics of HANFO by using C80 calorimeter

doi:10.11949/j.issn.0438-1157.20170667

Abstract

Abstract:

A CALVET calorimeter C80 was used to analyze the thermal behavior of porous granular ANFO explosive, three commonly used heavy ANFO explosives and emulsion explosive. The mass ratios of emulsion explosive/porous granular ammonium oil blasting agent of the heavy ANFO explosives are 25/75, 50/50, and 75/25. The thermal kinetic parameters of apparent activation energy (E_a), pre-exponential factor (lnA), and thermodynamic parameter of reaction heat (ΔH) of the five explosive samples were calculated based on the heat flux data in C80 curve with the heating rate of 0.2 K·min^-1. The results show that emulsion explosive has an apparent inhibitory effect on the thermal decomposition reaction of porous granular ANFO explosive, which makes the thermal decomposition onset temperature of porous granular ANFO explosive obviously increased. The calculated values of the apparent activation energy and the onset temperature of the heavy ANFO explosives are higher than that of porous granular ANFO and emulsion explosive. It could be concluded that the thermal stability of heavy ANFO explosives is higher than that of porous granular ANFO explosive and emulsion explosive.

Key words: HANFO explosive, C80 micro calorimeter, thermal decomposition characteristics, kinetic theory, thermal stability

摘要：

借助C80微量量热仪研究了多孔粒状铵油炸药、3种常用的重铵油炸药（乳化炸药/多孔粒状铵油炸药质量百分比分别为25/75、50/50、75/25）、乳化炸药的热分解特性，以升温速率0.2 K·min^-1时的C80热流速曲线数据为基础，求解了5种炸药试样热分解反应的反应热（ΔH）、表观活化能（E_a）、指前因子（lnA）等热力学和动力学参数。结果表明：乳化炸药的存在抑制了多孔粒状铵油炸药的热分解反应，使其开始发生热分解反应的温度被明显提高。重铵油炸药的表观活化能和放热反应开始温度均高于多孔粒状铵油炸药和乳化炸药，由此得出重铵油炸药的热稳定性高于多孔粒状铵油炸药和乳化炸药的热稳定性。

关键词: 重铵油炸药, C80微量量热仪, 热分解特性, 动力学理论, 热稳定性

CLC Number:

TJ55
O69

LI Hongwei, XU Feiyang, XIA Manman, CHENG Yangfan, GONG Yue. Thermal decomposition characteristics of HANFO by using C80 calorimeter[J]. CIESC Journal, 2018, 69(4): 1799-1805.

李洪伟, 徐飞扬, 夏曼曼, 程扬帆, 龚悦. 用C80量热仪研究重铵油炸药的热分解特性[J]. 化工学报, 2018, 69(4): 1799-1805.

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