Abstract: Numerical simulation method is used to study the suppression law of oil-gas leakage diffusion and explosion with water curtain in open space. When the oil-gas leaks from 5 000 m3 oil tank at the rate of 0.25 m/s for 600 s, the concentration at 4 m away from the leakage source is kept at 1.6%, exceeding the lower explosion limit. When the water curtain is sprayed for 80 s, the concentration of oil and gas in the area behind the water curtain is lower than 1/2 of the lower explosion limit. When the water curtain is sprayed for 250 s, only the oil and gas around the leakage source reaches the lower explosion limit. When there is no water curtain, the peak value of overpressure is 10.2 kPa and the peak value of temperature is 2 360 K. After adding water curtain, the peak value of overpressure decreased to 2.8 kPa, and the peak value of temperature decreased to 1 813 K. When the number of water curtain is 1, 2, 3 and 4, the peak values of overpressure are 2.8, 1.42, 1.3 and 1.1 kPa respectively, and the peak values of temperature are 1 813, 1 210, 993 and 382 K respectively. When the number of water curtain is 4, the effect of restraining high temperature peak is obvious. This paper can provide a theoretical reference for the prevention and disposal of oil-gas leakage and explosion accidents in the field of petrochemical production.

Key words: oil-gas leakage, leakage and diffusion, oil-gas explosion, water curtain suppression