流速对碳钢弯管段流动加速腐蚀速率的影响

doi:10.11902/1005.4537.2022.319

中国腐蚀与防护学报

2023, Vol. 43

Issue (5): 1064-1070 CSTR: 32134.14.1005.4537.2022.319 DOI: 10.11902/1005.4537.2022.319

研究报告

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流速对碳钢弯管段流动加速腐蚀速率的影响

潘代龙, 司晓东(

), 吕金洪

江苏科技大学能源与动力学院镇江 212100

Effect of Flow Velocity on Flow Accelerated Corrosion Rate of Carbon Steel Elbow

PAN Dailong, SI Xiaodong(

), LV Jinhong

School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212100, China

全文: PDF(4590 KB) HTML

摘要:

利用自行设计的流动加速腐蚀实验台和阵列电极技术研究了120 ℃下不同流速对20#碳钢弯管段流动加速腐蚀速率分布的影响。并基于流体动力学模拟分析了流体动力学参数与腐蚀速率之间的关联。结果表明：不同的流速下，最大腐蚀电流密度位于弯管外弯侧。随着流速的增大，流动加速腐蚀速率显著提高。此外，通过实验与模拟结果对比表明，径向局部速度分量可作为预测碳钢弯管段流动加速腐蚀速率大小的重要参数。基于最小二乘法拟合获得了径向局部速度分量与腐蚀速率间的经验公式。本研究可应用于火电、核电和化工等工业碳钢弯管运输管路的设计优化、运行监测和检修维护策略的制定。

关键词 ：弯管段, 流动加速腐蚀, 电化学, 数值模拟, 流体动力学

Abstract：

Carbon steel is the main material for power plants, oil and gas pipelines. Flow accelerated corrosion is the main factor causing pipeline failure in power plants, especially the secondary circuit pipeline system of the pressurized water reactor (PWR) nuclear power plant. In this paper, a home-made flow accelerated corrosion test rig and array electrode technology was used to study the effect of different flow rates on the flow accelerated corrosion rate distribution of 20# carbon steel elbow at 120 °C. The correlation between hydrodynamic parameters and corrosion rate was analyzed based on hydrodynamic simulation. The results show that the maximum corrosion current density is located at the external bending side of the elbow at different flow rates. With the increase of flow velocity, the flow accelerated corrosion rate increased significantly. In addition, the comparison of experimental data and simulation results show that the radial local velocity component can be used as an important parameter to predict the flow accelerated corrosion rate of carbon steel elbow. The empirical formula between the radial local velocity component and the corrosion rate was obtained by fitting based on the least square method. This research can be applied to design optimization, operation monitoring and maintenance strategy formulation of carbon steel elbow transport lines in thermal power, nuclear power and chemical industries.

Key words： elbow flow accelerated corrosion electrochemistry numerical simulation hydrodynamics

收稿日期: 2022-10-17 32134.14.1005.4537.2022.319

ZTFLH:

TG174

基金资助:江苏省双创博士项目(JSSCBS20210994)

通讯作者: 司晓东，E-mail: Xiaod_Si@163.com，研究方向为流动加速腐蚀

Corresponding author: SI Xiaodong, E-mail: Xiaod_Si@163.com

作者简介: 潘代龙，男，2001年生，本科生

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引用本文:

潘代龙, 司晓东, 吕金洪. 流速对碳钢弯管段流动加速腐蚀速率的影响[J]. 中国腐蚀与防护学报, 2023, 43(5): 1064-1070.
PAN Dailong, SI Xiaodong, LV Jinhong. Effect of Flow Velocity on Flow Accelerated Corrosion Rate of Carbon Steel Elbow. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1064-1070.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.319 或 https://www.jcscp.org/CN/Y2023/V43/I5/1064

图1 高温循环回路实验系统图

图2 实验段阵列电极安装及测点分布示意图

图3 不同流速条件下弯管段典型阵列电极Nyquist图

图4 电化学阻抗谱的拟合等效电路图

图5 不同流速下弯管实验段阵列工作电极的电荷传递电阻和腐蚀电流密度

表1 不同流速下典型位置阵列工作电极的电荷转移电阻和腐蚀电流密度

图6 各流体动力学参数与腐蚀电流密度比较

图7 径向局部速度与腐蚀电流密度的比较

图8 不同流速下径向局部速度与腐蚀电流密度的比较

图9 弯管实验段不同流速的腐蚀电流密度和Vr的拟合关系

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