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8258215 
Journal Article 
浮盘和气窗位置对内浮顶罐正己烷蒸发损耗的影响 
Li, F; Huang, W; Ji, H; Lyu, C; Jing, H; Guo, S; Hao, Q 
2018 
Huanjing Gongcheng Xuebao / Chinese Journal of Environmental Engineering
ISSN: 1673-9108 
Science Press 
12 
2 
410-416 
Chinese 
With the increasingly strict environmental protection and attention to the environment, it deserves further investigation into mechanisms for evaporative loss and emission reduction in internal floating-roof tanks. A scaled-model of 1 000 m3 internal floating-roof tank was made to investigate the influence of vent and floating-roof locations on the distribution of airflow, wind speed, mass concentration and evaporative loss rate in tanks. The results show that both tanks with shell vents and fixed-roof vents have two in-flowing vents and two out-flowing vents through which wind flows. The wind speed in shell-vent tanks is higher than that in fixed-roof-vent tanks, but mass concentration lower than that in the latter. The higher the floating-roof is, the higher the evaporative loss rate is and clearer the emission reduction, and the reason is that the circular movement of wind through the whole vapor space in shell-vent tanks has great influence on rim seal. It is recommended that vents should be transformed from tank shell to fixed-roof of tanks, and that the influence of vent and floating-roof locations should be considered in API loss formula. © 2018, Science Press. All right reserved. 
Evaporative loss; Floating roof; Internal floating-roof tank; Turbulent diffusion; Vent