加油过程中储油罐内静电场的动态过程研究

STUDY ON DYNAMIC ELECTROSTATIC BEHAVIOR IN A TANK DURING FILLING OPERATION

对加油过程中储罐内静电场的动态变化过程进行了研究,分别建立了油/气界面有无电荷积聚时罐内静电场计算模型,并利用模型对油/气界面有无电荷对油面电位和油内电荷密度的影响及油面上电荷和罐顶所构成的"电容效应"进行了分析。油/气界面上的静电荷对油内电荷密度的影响并不明显,但对油面电位则有显著的影响;当储罐接近装满时,油/气界面上的电荷和罐顶间将形成很强的"电容效应",严重影响其泄漏速度。利用模型对一实验油罐在加油过程中油面电位和油内电荷密度进行了计算。结果表明,油/气界面上无电荷积聚的计算模型得到的计算结果和实验结果非常吻合。

The dynamic electrostatic behavior in a cylindrical tank during oil filling operation is studied. Computation models of the electrostatic potential and field in a tank for both charge and no charge accumulation at the oil/gas interface are respectively established and used to analyze the impact of charge accumulation on interracial potential and the volume charge density in oil and investigate the surface charge capacitive coupling to the tank top wall. The electrostatic charge has an insignificant effect on the volume charge density in oil, but has a great impact on interracial potential. When the tank is nearly fully filled, the surface charge capacitive coupling to the tank top wall is strong, seriously affecting its leakage to the earth. Finally, the models presented in this paper are applied to calculate the interracial potential and the volume charge density in an experiment tank during filling operation. It shows that the calculation results given by the model without charge at the interface are in good accordance with the experimental results