Effect Analysis of Floating Deck and Vents Positions on N-hexane Evaporation Loss of the Internal Floating-roof Tank

Abstract

As a relatively ideal oil storage container, there is still space for further research on the mechanism of evaporation loss and the law of emission and consumption reduction of internal floating-roof rank. A small internal floating-roof tank was made to investigate the influence of vents and floating-deck positions on the distribution of airflow, wind speed, mass concentration and evaporation loss rate in the tank. The results showed that the wind speed in wall window tank is higher than that in top window tanks, but mass concentration is lower in the latter one. The higher the position of the floating-roof is, the higher the evaporation loss rate is and the better the effect of the emission reduction. It is recommended that vents should be transferred from the tank shell to the tank wall, and the influence of vents and floating decks positions should be considered in API loss formula.