中文摘要：

针对目前全氟烷烃灭火机理认识的不足，首先选取六氟丙烷为研究对象，通过管式裂解炉对六氟丙烷进行加热，进行不同温度下的裂解实验；其次，通过色谱－质谱联用仪，对六氟丙烷热解产物进行测定，分析六氟内烷热分解活化能随温升的变化；最后，通过实验测量结果和理论分析的结合，研究六氟丙烷化学灭火机理的动力学模型．研究结果表明，六氟丙烷热分解的临界温度在400～600℃之间，且热分解活化能随温度的升高而降低；灭火过程为燃烧过程中产生的自由基逐步转化为稳态物质的复杂链反应．其研究结果为深入认识六氟丙烷的微观灭火过程提供了理论基础．

英文摘要：

In this paper, the pyrolysis process of CF3CH2CF3 is studied under different temperature by tube pyrolysis apparatus. Then, the decomposed products are analyzed by gas chromatography-mass spectrometry, and the decomposition mechanism is particularly discussed. Finally, by coupling experimental result with theoretical analysis, the fire suppression mechanism is proposed. The results show that when the temperature is between 400 ℃ and 600 ℃, CFaCH2CF3 is decomposed. Besides, with the increase of thermal decomposition temperature, the active energy for CF3CH2CF3 pyrolysis decreases. The fire extinguishing process of CF3CH2CF3 is a complex chain reaction in which the radical gradually changes into steady state material, which can give a strong support for deeply understanding the fire extinguishing process of CF3CH2CF3.