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中国腐蚀与防护学报  2021, Vol. 41 Issue (3): 346-352    DOI: 10.11902/1005.4537.2020.050
  研究报告 本期目录 | 过刊浏览 |
区域阴极保护数值模拟边界条件反演计算方法研究及应用
庄大伟1, 杜艳霞1(), 陈涛涛2, 鲁丹平1
1.北京科技大学新材料技术研究院 北京 100083
2.北京燃气集团有限责任公司 北京 100035
Research on Boundary Condition Inversion Method for Numerical Simulation of Regional Cathodic Protection and Its Application
ZHUANG Dawei1, DU Yanxia1(), CHEN Taotao2, LU Danping1
1.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2.Beijing Gas Group Company Limited, Beijing 100035, China
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摘要: 

数值模拟计算可为区域阴极保护优化设计提供重要参考，但数值计算的精度受到多种因素的影响，特别是边界条件的确定。边界条件与站场埋地管网的防腐层类型、绝缘性能、土壤中的极化特性等因素有关，对于老旧站场，防腐层状况不能准确掌握，如何来确定不同区域埋地管道的边界条件是数值模拟计算的难点。本文探索了将现场试验和数值模拟相结合，使用反演计算获得边界条件的方法，在此基础上对阳极地床分布进行了数值模拟优化计算，确定了区域阴极保护设计方案。现场实施后，将计算结果与现场测试结果进行了对比，相对误差小于10%，验证了该方法的准确性。
关键词 ： 区域阴极保护,  数值模拟技术,  边界条件,  反演计算,  优化计算    
Abstract：

Numerical simulation could provide important information to optimize the regional cathodic protection system. However, the accuracy of numerical simulation is affected by several factors, especially by the boundary conditions, reflecting the coating condition, polarization characteristics of buried structures in the soil environment. The coating conditions of pipelines sometimes are quite different. It is difficult to determine the boundary conditions of buried pipelines accurately for in service stations. In this paper, the boundary conditions required for numerical simulation are acquired by inversion calculation, then based on the acquired boundary conditions, the optimal design for distribution of anode ground beds was carried out, therewith an optimized regional cathodic protection scheme was determined. Following the determined scheme, the construction of a regional cathodic protection system was realized, hence the calculation results were compared with the real field test results in the end. The margin of errors for the above two sets of results is under 10%, that verified reasonably the accuracy of the proposed method.
Key words： regional cathodic protection    numerical simulation    boundary condition    inversion calculation    optimization calculation
收稿日期: 2020-03-16     
ZTFLH:  TE988  
基金资助:国家重点研发计划(2016YFC0802103)
通讯作者: 杜艳霞     E-mail: duyanxia@ustb.edu.cn
Corresponding author: DU Yanxia     E-mail: duyanxia@ustb.edu.cn
作者简介: 庄大伟，男，1995年生，硕士生
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引用本文:

庄大伟, 杜艳霞, 陈涛涛, 鲁丹平. 区域阴极保护数值模拟边界条件反演计算方法研究及应用[J]. 中国腐蚀与防护学报, 2021, 41(3): 346-352.
Dawei ZHUANG, Yanxia DU, Taotao CHEN, Danping LU. Research on Boundary Condition Inversion Method for Numerical Simulation of Regional Cathodic Protection and Its Application. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 346-352.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.050      或      https://www.jcscp.org/CN/Y2021/V41/I3/346

图1  站场埋地管道三维几何模型及网格划分
图2  管道分布和临时阳极地床位置图
Number1# Anode bed2# Anode bed3# Anode bed
VselfvsCSE / VVonvs CSE / VVoffvs CSE / VΔV / mVVonvsCSE / VVoffvsCSE / VΔV / mVVonvsCSE / VVoffvsCSE / VΔV / mV
Area 1A1-0.5-1.46-0.62-120-1.74-0.74-240-1.14-0.68-180
A2-0.49-0.86-0.63-140-1.25-0.75-260-1.03-0.7-210
A3-0.47-0.97-0.62-150-1.37-0.74-270---------
A4-0.47-1.07-0.63-160-1.47-0.75-280---------
A5-0.47-1.05-0.61-140-1.44-0.73-260---------
A6-0.5-1.1-0.63-130-1.45-0.74-240---------
A7-0.48-0.96-0.6-120-1.36-0.7-220---------
A8-0.5-1.01-0.65-150-1.47-0.75-250-1.04-0.7-200
Area 2B1-0.54-0.74-0.59-50-1.57-0.72-180-0.82-0.65-110
B2-0.44-0.64-0.56-120-1.11-0.69-250-0.78-0.63-190
B3-0.47---------------------------
B4-0.55----------1.11-0.75-200-0.8-0.66-110
B5-0.47---------------------------
B6-0.55-0.75-0.66-110-1.19-0.8-250-0.88-0.71-160
B7-0.49---------------------------
B8-0.47----------1.3-0.79-320-0.82-0.63-160
B9-0.54---------------------------
B10-0.44-0.65-0.52-80-1.17-0.67-230-0.88-0.64-200
B11-0.52---------------------------
B12-0.52-0.7-0.57-50-1.24-0.68-160-0.88-0.64-120
B13-0.46---------------------------
B14-0.46-0.75-0.59-130-1.14-0.68-220-1.11-0.69-230
B15-0.48---------------------------
B16-0.47-0.8-0.59-120-1.2-0.7-230-1.25-0.71-240
B17-0.47-0.84-0.59-120-1.23-0.66-190-1.57-0.7-230
B18-0.49-------------------1.64-0.72-230
B19-0.48-0.75-0.57-90----------3.32-0.84-360
B20-0.42-0.69-0.54-120----------1.39-0.63---
B21-0.48, (-0.42~-0.52)-------------------1.29------
Area 3C1----------------------3.96-0.87-870
表1  管道电位偏移和站点反馈数据
图3  1#和3#阳极床保护实测断电电位与反演结果对比
Test point

Area2

B15~B17

Area1& Area 2

A7~B17

Area2

B17~B21

Area1

A1~A2

Area1

A8~B1

Area1

B2~B6

Other
Coating surface resistivity / Ω·m2200020002000100000500001000003000
Coating damage rate1.86×10-42.48×10-43.10×10-41.66×10-62.48×10-68.28×10-78.27×10-5
表2  管道防腐层特性反演结果
图4  站场埋地管道防腐层极化曲线反演结果
图5  阳极地床位置分布图
Test pointMeasured off-potential V (CSE)Calculated off-potential V (CSE)Error
1#-1010-995-1.49%
2#-1000-990-1.00%
3#-1040-985-5.29%
4#-1150-11600.87%
5#-1080-10900.93%
6#-940-920-2.13%
7#-980-10305.10%
8#-950-9702.11%
9#-960-9802.08%
10#-880-9659.66%
11#-930-9805.38%
12#-970-109012.37%
13#-970-10659.79%
14#-940-10309.57%
15#-880-8800.00%
16#-890-880-1.12%
17#-900-880-2.22%
18#-960-875-8.85%
19#-920-875-4.89%
表3  计算电位与实测电位误差
图6  测试点的分布位置
图7  保护电位分布云图
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[2] 杜艳霞 . 阴极保护电位分布的数值计算[J]. 中国腐蚀与防护学报, 2008, 28(1): 53-58 .

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