大型内浮顶罐油气损耗数值模拟

Numerical simulation of oil vapor losses in a large internal floating roof tank

以某石化公司大型内浮顶油罐为研究对象,基于RNG k-ε理论建立该内浮顶油罐油气泄漏控制方程,采用Creo软件建立该油罐油气泄漏计算三维模型,并应用计算流体动力学(CFD)软件对该油罐密封泄漏损耗进行数值模拟,研究该油罐浮盘边缘密封圈高度、密封间隙以及罐内温度对内浮顶油罐密封泄漏损耗的影响。结果表明:油气泄漏速度与泄漏量均随着密封圈高度增加而逐渐降低,且当密封圈高度超过22 cm时,油气泄漏量降低趋势趋于平缓;密封间隙增大,油气泄漏速度逐渐降低,但油气泄漏量不断增大;罐内温度升高,油气泄漏速度与泄漏量均随之增加。

A large oil storage tank with internal floating roof is selected and studied. Based upon RNG κ-ε theory,the governing equations of oil vapor leakage in the floating roof tank are established. A threedimensional model for oil vapor leakage evaluation of the floating roof tank is built by using the Creo software.In addition,the CFD method is applied to simulate the seal leakage loss of the tank. The impact of the seal ring height,the seal gap and the temperature inside the tank on the oil vapor leakage loss are studied. The results show that the oil vapor leakage velocity and the amount of leakage loss gradually decrease with the increase of the seal ring height. When the seal ring height is greater than 22 cm,the oil vapor leakage loss tends to be near constant. The velocity of oil vapor leakage gradually goes down with the increase of the seal gap.However,the amount of oil vapor leakage loss gradually increases with the increase of the seal gap. It is found that the velocity of oil vapor leakage and the amount of leakage loss increase with the increase of the temperature inside the tank.