The influences of temperature

relative humidity and fire-retardant on the explosion range of new alternative refrigerants HFC-32 were investigated through an experiment bed for the explosion range of flammable gases. The results indicated that the enhancement of temperature can improve the upper explosion range of HFC-32 and decrease its lower explosion range

then enlarges the explosion range of HFC-32 under the temperature of﹣5~55 ℃. The improvement of relative humidity makes the lower explosion range of HFC-32 slightly increase

and the upper explosion range slightly decrease at the relative humidity range of less than 60% for HFC-32. When the relative humidity increases from 60% to 87%

the upper explosion range of HFC-32 decreases rapidly to make the explosive range of HFC-32 disappear. The addition of CF3I or HFC-134a fire-retardant can lead the explosion range of HFC-32 to reduce

and the effect of CF3I on the inflaming retarding of HFC-32 is superior to HFC-134a. When the volume ratio of CF3I/HFC-32 increases from 0 to 1 or HFC-134a/HFC-32 increases from 0 to 10

their explosion ranges disappear. This provides an important theoretical basis for inhibiting the combustion of HFC-32.