Study on the Hazards of Oil and Gas Emissions from Oil Storage Tanks and Tank Groups with Different Nitrogen Supplementation Levels through Breathing Valves

The external wind speed forms a vortex at the top of the storage tanks, accelerating the diffusion and dilution of emissions through the top breathing valve of the tank. This downwind effect is observed in single tank, two tank, or three tank configurations, with acceleration and dilution effects becoming more pronounced as wind speed increases. Installing monitoring equipment at the bottom of the storage tank to monitor the danger of breathing valve emissions is ineffective. The monitoring of the lower explosive limit concentration of breathing valve emissions is mainly in the downwind direction, and the vertical and vertical upward diffusion is not obvious. The higher the emission concentration, the shorter the monitoring time required. The higher the external wind speed, the smaller the explosion hazard area formed in the downwind direction. The monitoring equipment installed at 0.1m from the center of the tank top can quickly monitor the lower explosive limit concentration formed by the discharge of the breathing valve. Comprehensive measures should be taken to control the detected lower explosive limit concentration. Classification number: X913 Document identification code: A