This paper presents the results of the lower flammability limit (LFL) of C 3 H 8 /O 2 /CO 2 at normal temperature and pressure. The LFL of the C 3 H 8 /O 2 /CO 2 mixture was measured with an explosion vessel. The measured LFL of propane increased approximately linearly from 2.5% to 4.3% with the CO 2 concentration rising from 5% to 70%. CO 2 participates in element reactions, which decreases the combustion heat at LFL. The reduction of combustion heat is improved by the rising CO 2 concentration and reached a maximum of 21.5% at 70% CO 2 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 CO 2 , while the radiative effect was reduced.

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