Abstract: Aiming at the problem about the damage range of casualties caused by the fire and explosion of natural gas stations， and taking a natural gas station as the research object, the PHAST software is used to simulate and analyze the consequences of gas cloud explosions, flash fires, and jet fire caused by different degrees of leakage in the natural gas station, and the safety distance, personal risk and social risk curves of each typical accident in the station are calculated. It showed that the larger the leakage aperture is, the greater the scope of leakage and diffusion is; The heat radiation value of the jet fire will gradually increase with the distance from the downwind direction, and after reaching a certain peak, it will gradually weaken and finally stabilize. The downwind distance from the explosion center to the leakage point is increasing, and the hazardous area of the explosion overpressure is expanding. The risk curve quantitatively reflects the threat to the surrounding environment and population. This conclusion can provide scientific data for fire rescue and emergency plans.

Key words:

fire fighting, natural gas, leakage, PHAST, simulation of accident consequences, risk assessment  ,