摘要
绝缘管道内的油流带电将造成管道内壁面上静电荷的积聚,当电荷积聚到一定程度时,会发生静电放电,造成管道表面腐蚀,甚至导致管壁穿孔。因此,管道壁面上静电场的有效计算公式对于确保油品的安全输送无疑具有指导意义。在合理简化的基础上,文章推出了架空敷设和管外壁附有接地导体层的绝缘管道壁面上静电势和电场强度的计算公式,利用计算公式简要分析了敷设方式和管材的导电性能对这两个参量的影响。计算结果表明:两种敷设方式下管壁的静电位都随管材电导率的增加而减少;与架空敷设相比,管外壁接地导体层能明显降低管壁面上的电场强度,因此绝缘管道应尽量避免架空敷设。
When oil flows through an insulated pipeline, charge accumulation will occur at the liquid/solid interface, which causes an electrostatic potential build-up. When the potential is above a certain threshold, an electrostatic discharge may occur and result in erosion and even puncture at the wall. So an effective formula to evaluate the electric field at the wall has a guiding meaning to ensure the safety of oil transport and storage. Based on some reasonable simplifications, formulas for electrostatic potential and field strength at the wall of an insulated pipeline either overhead laying or with a grounded conductive layer outside the insulated wall are derived in this paper. Finally, these formulas are used to analyze briefly the influences of the different pipeline laying ways and the pipe wall’s conductivity on the potential and field strength at the wall. Calculation results show that the electrostatic potential at the pipe wall decreases with increase of conductivity of the pipe wall material in both pipeline laying ways, and that compared with the overhead laying, the grounded conductive layer outside the insulated pipe wall can remarkably reduce the strength of electric field at the wall. Therefore it is advised that the overhead laying way for insulated pipeline should be avoided as possible.
出处
《石油工程建设》
2009年第1期5-10,共6页
Petroleum Engineering Construction
基金
中国人民解放军总后勤部军需物资油料部资助项目(20070407)
关键词
绝缘管道
油流带电
静电势
电场强度
敷设方法
insulated pipeline
oil flow electrification
electrostatic potential
electric field strength
laying method
