| 邢少华,杨光付,刘广义,郑斐,徐传鑫.船舶海水管路直流杂散电流仿真研究[J].装备环境工程,2021,18(9):93-100. XING Shao-hua,YANG Guang-fu,LIU Guang-yi,ZHENG Fei,XU Chuan-xin.Numerical Simulation of DC Stray Current on Seawater Pipe of Ship[J].Equipment Environmental Engineering,2021,18(9):93-100. |
| 船舶海水管路直流杂散电流仿真研究 |
| Numerical Simulation of DC Stray Current on Seawater Pipe of Ship |
| 投稿时间：2020-12-02 修订日期：2021-02-26 |
| DOI：10.7643/issn.1672-9242.2021.09.014 |
| 中文关键词: 管路 直流杂散电流 腐蚀 数值仿真 绝缘电阻 铜镍合金 |
| 英文关键词:pipe DC stray current corrosion numerical simulation insulation resistance cupronickel |
| 基金项目: |
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| Author | Institution |
| XING Shao-hua | State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China |
| YANG Guang-fu | Naval Research Academy of PLA, Beijing 100073, China |
| LIU Guang-yi | State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China |
| ZHENG Fei | State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China |
| XU Chuan-xin | State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China |
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| 中文摘要: |
| 目的 针对某型船海水管路杂散电流腐蚀穿孔问题，研究海水管路直流杂散电流密度与直流电气设备机壳绝缘电阻关系，评估海水管路直流杂散电流腐蚀风险，提出直流电气设备机壳绝缘电阻要求，为船舶海水管路杂散电流控制提供技术支撑。方法 根据欧姆定律和腐蚀电化学原理，建立船体与海水管路直流杂散电流腐蚀仿真方法，模拟海水管路直管、弯管以及某船海水管路系统结构，以B10铜镍合金极化曲线为边界条件，开展管壁直流杂散电流密度仿真研究，并根据法拉第定律计算直流杂散电流腐蚀速率。结果 直流电气设备接地产生的直流杂散电流大部分流入船体，仅有少部分流入海水管路，正常情况下，机壳绝缘电阻大于1 MΩ，直流电气设备接地不会导致海水管路发生杂散电流腐蚀。结论 为避免直流电气设备接地造成海水管路杂散电流腐蚀，DC380 V和DC220 V电气设备机壳绝缘电阻应分别不小于211 Ω和123 Ω。 |
| 英文摘要: |
| In view of the stray current corrosion perforation problem of seawater pipelines of a certain type of ship, the relationship between the DC stray current density of seawater pipelines and the insulation resistance of DC electrical equipment enclosures is studied, the risk of DC stray current corrosion of seawater pipelines is evaluated, and the insulation resistance requirements of the enclosure of DC electrical equipment are proposed to provide technical support for the control of stray currents in marine seawater pipelines. According to Ohm’s law and the principle of corrosion electrochemistry, a DC stray current corrosion simulation method for ship hull and seawater pipelines was established to simulate the straight pipes, elbow pipes and the structure of the seawater pipeline system of a ship. The polarization curve of B10 cupronickel was taken as the boundary conditions, the simulation study of the DC stray current density of the pipe wall was carried out, and the corrosion rate of the DC stray current was calculated according to Faraday’s law. Most of the DC stray current generated by the grounding of DC electrical equipment flowed into the hull, and only a small part flowed into the seawater pipeline. Under normal circumstances, the insulation resistance of the chassis is greater than 1 MΩ, and the grounding of the DC electrical equipment will not cause stray currents in the seawater pipeline corrosion. In order to avoid the stray current corrosion of the seawater pipeline caused by the grounding of DC electrical equipment, the insulation resistance of the enclosure of DC380 V and DC220 V electrical equipment should be no less than 211 Ω and 123 Ω, respectively. |
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