Influence Of Wind Deviation Angle On N-Hexane Evaporation Loss Of Internal Floating-Roof Tanks

With the increasing attention to environmental protection, it is still necessary to strictly control the oil evaporation loss from the IFRT (internal floating-roof tank) to the atmosphere. Upon using n-hexane as a representative of light oil, the effects of the WDAs (wind deviation angles) on airflow distribution, the wind speed, the n-hexane vapor concentration, and the evaporation loss rate in the IFRT were investigated, and the mass transfer of the vapor-air was analyzed. The results are shown as follows: when the WDA is 0 degrees, the vapor concentration in the gas space above the floating deck is the lowest; when the WDA is 22.5 degrees, the oil evaporation loss rate is the largest; when the WDA is 45 degrees, the vapor concentration is the highest, but the evaporation loss rate is the smallest. It is recommended to arrange the vent to the wind direction with an angle of 45 degrees to reduce the evaporation loss and protect the atmospheric environment.