Electrostatic experiment for storage tanks during filling with diesel and white oil

doi:10.16085/j.issn.1000-6613.2017-2248

Abstract

Abstract: An experiment platform for electrostatic measurement of oil tanks filling system was established. The dissipation current on the galvanized metal pipeline, plastic pipeline with metal frame and PVC pipeline, and the electrostatic potential in the oil tank during bottom-filling and top-filling with the crane tube inserted to the tank base were measured. The results shown that:(1) during the diesel oil flowing through pipelines, the amount of electrostatic charge generated on the pipeline and the dissipation current increased with the electrical conductivity of the pipeline; (2) the electrostatic charge on the galvanized metal pipeline dissipated to the ground at the same time that the oil flowed in the pipe, while for PVC pipeline after 3.5s the electrostatic charge began to dissipate; (3) relaxation tank installed in the filling system can dissipate part of the electrostatic charge in the oil to the ground and the electrostatic charge flowing into the tank decreased, so the electrostatic potential in the tank decreased; (4) when the filling liquid is diesel the maximum surface potential in the tank during top-filling with the crane tube inserted to the tank base was lower than bottom-filling, and when the filling liquid is white oil the results was opposite; (5) the effect of the grounding measure on the maximum surface potential in the tank during filling with white oil was less than filling with diesel. The research provides references for the selection of filling pipes, filling patterns and the arrangement of the oil tanks filling system, so as to reduce the electrostatic risk.

Key words: electrostatic charge, surface potential, dissipation current, storage tank, experiment

摘要： 搭建储罐充装油品系统静电实验平台，实验测量镀锌金属管、金属骨架塑料软管、PVC管输油过程管道逸散电流以及采用底部管道输油、中间鹤管输油等不同充装方式时储罐内液面最大电势。实验结果表明：管道输送柴油过程中，管道导电能力越强管道内油品流动产生的静电荷越多，管道逸散电流越大；镀锌金属管道内油品开始流动，管道上静电荷即开始逸散，而PVC管内油品流动约3.5s后管道上静电荷开始逸散；输油管路中设置逸散罐可使油品中部分电荷逸散到大地，以减少储罐内静电荷输入量，可以使储罐内静电势降低约50%；储罐充装柴油过程中，中间鹤管输油比底部管道输油产生的液面最大电势小，但储罐充装白油过程则相反；储罐充装白油过程中，储罐是否接地对储罐内静电势的影响显著小于储罐充装柴油过程。研究结果对于指导充装方式、输油管道选取以及输油管路布置以降低静电危险性具有重要意义。

关键词: 静电, 液面电势, 逸散电流, 储罐, 实验

CLC Number:

TE88

WANG Liangwang, CHEN Guohua, YAN Dapeng, WANG Xinhua, LIANG Jun. Electrostatic experiment for storage tanks during filling with diesel and white oil[J]. Chemical Industry and Engineering Progress, 2018, 37(10): 3765-3771.

王良旺, 陈国华, 严大鹏, 王新华, 梁峻. 储罐充装柴油与白油过程的静电实验[J]. 化工进展, 2018, 37(10): 3765-3771.

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