Study on the hazard of oil and gas emissions from oils tank with different nitrogen supplement levels through breathing valves
With the increasing construction volume of large oil storage tanks,there is still insufficient research on the explosive hazards caused by the gas phase oil and gas concentration formed by internal floating roof tanks under different nitrogen replenishment levels and the discharge through breathing valves.The oil and gas concentration in the gas-phase space formed under different nitrogen supplementation levels was studied using Fluent simulation,and the explosion hazard of breathing valve emissions at different wind speeds was studied.The results show that installing monitoring equipment for breathing valve emissions at the bottom of the tank cannot effectively monitor the hazard;The external wind speed forms a vortex at the roof of the tank,and the squeezing effect is obvious near the breathing valve,which accelerates the diffusion and dilution of the oil and gas discharged from the breathing valve;When there is no external wind interference,the monitoring equipment can be installed 0.1 m away from the center of the tank roof to quickly monitor the explosion hazard of oil and gas concentration of 5%～100%in the gas phase space discharged through the breathing valve;After the monitoring equipment outside and inside the tank detects hazardous concentrations,comprehensive measures should be taken to prevent the formation of hazardous oil and gas concentrations in the gasphase space,prevent the formation of discharge pressure in the gas-phase space,and prevent the discharge of oil and gas of hazardous concentrations.
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