School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China.
School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China.
J Hazard Mater. 2017 Sep 5;337:10-19. doi: 10.1016/j.jhazmat.2017.04.063. Epub 2017 Apr 28.
In order to analyze the thermal decomposition characteristics of ammonium nitrate (AN), its thermal behavior and stability under different conditions are studied, including different atmospheres, heating rates and gas flow rates. The evolved decomposition gases of AN in air and nitrogen are analyzed with a quadrupole mass spectrometer. Thermal stability of AN at different heating rates and gas flow rates are studied by differential scanning calorimetry, thermogravimetric analysis, paired comparison method and safety parameter evaluation. Experimental results show that the major evolved decomposition gases in air are HO, NH, NO, NO, NO and HNO, while in nitrogen, HO, NH, NO and HNO are major components. Compared with nitrogen atmosphere, lower initial and end temperatures, higher heat flux and broader reaction temperature range are obtained in air. Meanwhile, higher air gas flow rate tends to achieve lower reaction temperature and to reduce thermal stability of AN. Self-accelerating decomposition temperature of AN in air is much lower than that in nitrogen. It is considered that thermostability of AN is influenced by atmosphere, heating rate and gas flow rate, thus changes of boundary conditions will influence its thermostability, which is helpful to its safe production, storage, transportation and utilization.
为了分析硝酸铵（AN）的热分解特性，研究了其在不同条件下的热行为和稳定性，包括不同的气氛、加热速率和气体流量。使用四极质谱仪分析了 AN 在空气和氮气中的分解气体。通过差示扫描量热法、热重分析、配对比较法和安全参数评估研究了 AN 在不同加热速率和气体流量下的热稳定性。实验结果表明，空气中的主要分解气体为 HO、NH、NO、NO、NO 和 HNO，而氮气中的主要成分是 HO、NH、NO 和 HNO。与氮气气氛相比，在空气中得到的初始和终了温度更低，热通量更高，反应温度范围更宽。同时，较高的空气气体流量往往会降低反应温度并降低 AN 的热稳定性。AN 在空气中的自加速分解温度远低于氮气中的温度。认为 AN 的热稳定性受气氛、加热速率和气体流量的影响，因此边界条件的变化会影响其热稳定性，这有助于其安全生产、储存、运输和利用。
