中文摘要：

采用激光吸收光谱分析法，测试了不同体积分数七氟丙烷与杯式燃烧器火焰作用过程中氟化氢产生量，研究了七氟丙烷体积分数对氟化氢产生量的影响规律．测试了七氟丙烷在不同灭火速度下熄灭杯式燃烧器火焰时的氟化氢产生量，考察了灭火速度对氟化氢产生量的影响．结合试验测试结果，分析了七氟丙烷灭火时的热分解过程及灭火机理．结果表明，七氟丙烷与燃烧杯火焰作用过程中，在七氟丙烷体积分数远远小于临界灭火体积分数（8．4％，乙醇火）时，其体积分数越高，产生的氟化氢质量体积分数越大，当七氟丙烷体积分数增大到1．3％时，氟化氢质量浓度超过4000mg／m^3．使用七氟丙烷熄灭燃烧杯火焰时，灭火速度越快，灭火剂与火焰的作用时问就越短，产生的氟化氢质量浓度就越低．

英文摘要：

This article presents the study on thermal decomposition characteristics and hydrogen fluoride （HF） formation during fire suppression using 2-H-heptafluoropropane. HF gases generated during chemical suppres- sion of cup burner fires using 2-H-heptafluoropropane are measured through diode laser absorption spectroscopy measurements. The influence of the concentration of 2-H-heptafluoropropane on HF formation is investigated. The relationships between the speed of fire suppression and the concentration of HF generated during fire extinguishing are investigated. The extinguishing mechanism and the process of thermal decomposition of 2-H-heptafluoropropane are theoretically and experimentally analyzed. The results show that the greater the concentration of 2-H- heptafluoropropane, the greater that of the HF generated when the concentrations of the former is far smaller than the critical extinguishing concentration （8.4%, ethanol）. When the concentration of 2-H-heptafluoropropane reaches 1.3%, the HF concentration is beyond 4 000 mg/m^3. There is a direct correlation between agent discharge time and the amount of the HF generated. The shorter the fire suppression time, the smaller concentration of HF generated during extinguishing the cup burner fire using 2-H-heptafluoropropane.