浮顶油罐密封圈油气分布数值模拟

浮顶油罐一二次密封空间内的油气在雷击作用下可导致起火事故。为研究浮顶油罐一二次密封空间内的油气浓度影响因素，利用CFD方法进行了数值模拟，并建立了浮顶油罐实验模型，检测一二次密封空间内不同位置处的油气体积分数，两者表征的油气浓度情况较吻合；借助该模拟方法进一步分析温度、风速和二次密封泄漏面积对浮顶油罐一二次密封空间内的油气浓度的影响，研究结果表明:①二次密封泄漏面积增加，密封空间内的油气浓度降低。②温度上升，一二次密封空间的油气浓度升高；当风速较高时，温度对油气浓度变化趋势的影响也更大。③风速增加时，空间内的油气分布差异变大，油气浓度最大值变大。

Numerical simulation on oil vapor distribution in seal ring of floating roof tank

The oil vapor within the primary and secondary sealing space of floating roof tank can lead to fire accident by lighting. In order to study the influence factors of oil vapor concentration within the primary and secondary sealing space of floating roof tank, the numerical simulation was carried out by using CFD method, and an experimental model of floating roof tank was established to test the volume fraction of oil vapor at different positions within the primary and secondary sealing space, both the represented oil vapor concentrations agree better. Though using the simulation method, the influence of temperature, wind velocity and leakage area of secondary seal on the oil vapor concentration within the primary and secondary sealing space of floating roof tank were further analyzed. The results showed that the oil vapor concentration in the sealing space decreases when the leakage area of secondary seal increases, and it increases when the temperature increases. The influence of temperature on the change trend of oil vapor concentration becomes greater when the wind velocity is higher. The difference of oil vapor distribution in the space and the maximum value of oil vapor concentration become greater when the wind velocity increases.