This paper presents the results of the lower flammability limit (LFL) of C₃H₈/O₂/CO₂ at normal temperature and pressure. The LFL of the C₃H₈/O₂/CO₂ mixture was measured with an explosion vessel. The measured LFL of propane increased approximately linearly from 2.5% to 4.3% with the CO₂ concentration rising from 5% to 70%. CO₂ participates in element reactions, which decreases the combustion heat at LFL. The reduction of combustion heat is improved by the rising CO₂ concentration and reached a maximum of 21.5% at 70% CO₂ concentration. The effects of specific heat capacity and radiation property of the gas mixture on the LFL were analyzed. The effect of specific heat was improved by CO₂, while the radiative effect was reduced.

中文翻译：

---

二氧化碳对O ₂ / CO ₂气氛中丙烷可燃性下限的影响

本文介绍了在常温常压下C ₃ H ₈ / O ₂ / CO _2的可燃性下限（LFL）的结果。用爆炸容器测量C ₃ H ₈ / O ₂ / CO ₂混合物的LFL 。丙烷的测得的LFL大约线性地从2.5％增加到4.3％，而CO ₂浓度从5％增加到70％。CO ₂参与元素反应，从而降低了LFL的燃烧热。燃烧热量的减少通过增加CO ₂浓度而得到改善，在70％CO _2时达到最高21.5％浓度。分析了混合气体的比热容和辐射特性对LFL的影响。通过CO ₂改善了比热的效果，同时降低了辐射效果。