Abstract: The proportion range of R290（Propane）was determined according to the thermophysical parameters after mixing with physical inhibitor CO2 and chemical inhibitor R13I1（iodotrifluoromethane）. The experimental results showed that the mixture of R13I1 and R290 have the capacity to replace the traditional refrigerant, and the ratio could be determined by the thermophysical parameters of the existing refrigerant to be replaced. The explosion parameters of R290 mixed with CO2 and R13I1 were measured by combustible gas / vapor explosion test device. According to the experimental result, when the volume fraction of CO2 and R13I1 to R290 were 26.5% and 6.42% respectively, R290 was no longer explosive. At the same time, for R290, the theoretical formula for predicting the minimum inert concentration of chemical inhibitors was derived.

Key words: explosive characteristics, inhibitor, R290, mixed refrigerant, explosion limit