全卤代烃对可燃制冷剂燃烧极限的抑制性研究

摘要

The flammability limits for seven binary mixtures were measured experimentally as per the Chinese National Standard GB/T12474-90.They were propane/trifluoroiodomethane,propane/tetrafluoromethane,1,1-difluoroethane/tetrafluoromethane,methane/hexafluoroethane,1,1-difluoroethane/trifluoroiodomethane,ethane/trifluoroiodomethane and methane/trifluoroiodomethane.All measurements were carried out at atmospheric pressure and room temperature around 20℃ with an estimated uncertainty below 0.27mo1％.The extended Le Chatelier's formula was further developed to interpret the dilution effect of fully halogenated hydrocarbons on the flammability limits of flammable refrigerant mixtures.Numerical analysis was carried out using the above modified formula for newly measured experimental data.It is found that the modified formula can fit the flammability limit data of individual refrigerant diluted with the fully halogenated hydrocarbons very well.%依据国标GB/T12474-90,对7组二元混合物的燃烧极限进行了实验测量,分别是丙烷/三氟碘甲烷、丙烷/四氟甲烷、1,1-二氟乙烷/四氟甲烷、甲烷/六氟乙烷、1,1-二氟乙烷/三氟碘甲烷、乙烷/三氟碘甲烷和甲烷/三氟碘甲烷.所有测量都在大气压力和室温条件下进行,测量不确定度低于0.27 mol％.通过对已经修正过的Le Chatelier的预测模型进一步的修改和开发,并用新的模型预测了全卤代烃对可燃的混合物制冷剂燃烧极限的抑制性.通过分析预测结果和实验数据,发现改进后的公式能够很好地拟合经过全卤代烃稀释后的可燃制冷剂的燃烧极限实验数据.