化工进展2019，Vol.38Issue(3)：1226-1235,10.DOI:10.16085/j.issn.1000-6613.2018-0904
外浮顶罐不同孔隙油气泄漏扩散数值模拟
Numerical simulation of oil vapor leakage and diffusion from different pores of external floating-roof tank
摘要
Abstract
It is important to reveal the mechanism and law of oil vapor leakage and diffusion of external floating-roof tank (EFRT) to ensure the tank farm safety and reduce the environmental pollution. In present paper, numerical simulation and experimental verification were carried out for the oil vapor leakage and diffusion of large and small EFRT at different leak locations and pore sizes. The results were as follows. ① When the wind blows to the EFRT, a large scale eddy will form above the floating deck and form a symmetrical distribution of air flow from the downwind side to the upper wind side. ② When a pore leak occurs above the floating deck, oil vapor is closely attached to the floating deck and moves from the downwind to the upwind side. Oil vapor is easy to spread out when the leakage positions of the floating deck are located in the middle or the downwind side, but it is easy to accumulate when the positions are on upwind side or both sides of the floating deck, and there is a great potential safety hazard. The increase of wind speed is beneficial to the diffusion of oil vapor, but it will enlarge the scope of pollution. ③ when there was a rim leakage between the floating deck and tank wall, oil vapor diffuses along the tank wall to the upper space of the floating deck, and the extent of diffusion is: the sides of the floating deck> the upper wind side> the downwind side. ④ For the central leakage pore of the floating deck, when the pore diameter is 20 mm, the volume fraction of n-heptane is between 0.1％ and 1.7％, which is within the corresponding explosion limit range; however, when the pore diameter is 6 mm, the volume fraction of nheptane is between 0.02％ and 0.26％ and the volume fraction of gasoline vapor is between 0.05％ and0.65％, which all are not up to the explosion limit range. Thus, the possibility of explosion danger increases with the enlargement of the pore diameter. The research results will further reveal the migration law of the mixture gas of the vapor-air above the floating deck and the mass transfer mechanism of oil vapor diffusion, which can provide theoretical guidance for field practice and oil tank management and improve the theoretical system for evaluating the EFRT evaporation loss.关键词
外浮顶罐/油气泄漏/油气扩散/传质机理/数值模拟Key words
external floating-roof tank/oil vapor leakage/oil vapor diffusion/mass transfer mechanism/numerical simulation分类
能源科技引用本文复制引用
郝庆芳,黄维秋,景海波,李飞,方洁,纪虹,凌祥,吕爱华..外浮顶罐不同孔隙油气泄漏扩散数值模拟[J].化工进展,2019,38(3):1226-1235,10.基金项目
国家自然科学基金(51574044,51576095) （51574044,51576095）
江苏省重点研发计划(产业前瞻与共性关键技术)(BE2018065) （产业前瞻与共性关键技术）
江苏省高校重点实验室开放课题(2013Z01) （2013Z01）
江苏省研究生科研与实践创新计划(SJCX17_0721) （SJCX17_0721）
