| 周冰,赵玉飞,张盈盈,韩文礼,王顺,董亮.在役海洋桩基平台牺牲阳极阴极保护数值模拟[J].装备环境工程,2021,18(1):110-118. ZHOU Bing,ZHAO Yu-fei,ZHANG Ying-ying,HAN Wen-li,WANG Shun,DONG Liang.#$NPNumerical Simulation of Sacrificial Anode Cathodic Protection for Offshore Pile Foundation Platform in Service[J].Equipment Environmental Engineering,2021,18(1):110-118. |
| 在役海洋桩基平台牺牲阳极阴极保护数值模拟 |
| #$NPNumerical Simulation of Sacrificial Anode Cathodic Protection for Offshore Pile Foundation Platform in Service |
| 投稿时间：2020-09-30 修订日期：2020-10-25 |
| DOI：10.7643/issn.1672-9242.2021.01.017 |
| 中文关键词: 桩基平台 牺牲阳极 阴极保护 接水电阻 电位分布 数值模拟中图分类号:TG174.4 文献标识码:A 文章编号:1672-9242(2021)01-0110-09 |
| 英文关键词:pile foundation platform sacrificial anode cathodic protection water resistance potential distribution numerical simulation |
| 基金项目:国家自然科学基金(51401017)；中国石油天然气集团公司重大科技专项(2019A-1010) |
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| Author | Institution |
| ZHOU Bing | CNPC Engineering Technology Research Co., Ltd, Tianjin 300451, China;Key Laboratory of CNPC Tubular Goods Engineering, Tianjin 300451, China |
| ZHAO Yu-fei | CNPC Engineering Technology Research Co., Ltd, Tianjin 300451, China;Key Laboratory of CNPC Tubular Goods Engineering, Tianjin 300451, China |
| ZHANG Ying-ying | CNPC Engineering Technology Research Co., Ltd, Tianjin 300451, China;Key Laboratory of CNPC Tubular Goods Engineering, Tianjin 300451, China |
| HAN Wen-li | CNPC Engineering Technology Research Co., Ltd, Tianjin 300451, China;Key Laboratory of CNPC Tubular Goods Engineering, Tianjin 300451, China |
| WANG Shun | Engineering & Design Institute of CPOE, Beijing 100028, China |
| DONG Liang | Changzhou University, Changzhou 213164, China |
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| 中文摘要: |
| 目的 分析海洋桩基平台所在浅海区域牺牲阳极接地电阻和不同牺牲阳极方案的保护效果及施工量，为海洋桩基平台牺牲阳极阴极保护设计提供指导。方法 利用BEASY CP数值模拟软件，对桩基平台牺牲阳极阴极保护系统设计中阳极接水电阻和不同保护方案的保护效果进行数值模拟计算。结果 在文中桩基平台所在海域内，所选牺牲阳极单支布置于海水/海泥界面0.25 m以上、水面1.35 m以下时，接水电阻接近且相对最小，约为0.048 Ω，比标准推荐公式计算的接水电阻大约26%。多支组合阳极的接水电阻，随阳极数量或阳极间距的增大而降低，但因存在拥挤效应，其接水电阻要明显高于理想的多支阳极并联电阻。在设定的牺牲阳极布置方案中，将牺牲阳极布置于距离海水/海泥交界面0.8 m处，共给出了3种阳极的组合方式，即5支、3支组合阳极和单支阳极。再基于阳极位置或数量变化合计，设置6种牺牲阳极方案，每种方案下的阳极总数处于48~60支之间。计算结果显示，在不同牺牲阳极方案下，桩基平台的保护电位分布区间较为接近，约处于‒680~‒1080 mV(vs. CSE)之间。不同方案的保护效果差异主要体现在对腐蚀性相对较高的海水和海水/海泥交界面附近主桩和隔水管的保护上，随着阳极由5支组合阳极方案、3支组合阳极方案到单支阳极方案转变，牺牲阳极输出总电流由110 A增加到133 A，其对主桩和隔水管的保护效果越好，即保护电位越负，且保护距离增加。其中对主桩在海泥中的保护距离由5~8 m增加到5~10 m，对隔水管在海泥中的保护距离由0~3 m增加到4~7 m。5支组合阳极方案1中，两侧阳极输出最大电流约为中间阳极输出电流的2倍，3支组合阳极方案2中各牺牲阳极输出电流相当。结论 通过数值模拟方法，可优化牺牲阳极数量、组合方式和位置，从而实现保护电位分布更均匀。基于案例提出的3支组合阳极方案2兼具了保护效果、阳极输出电流均匀性和相对较少的施工量等特点，可为在役海洋桩基平台牺牲阳极阴极保护设计提供参考。 |
| 英文摘要: |
| The analysis on the ground resistance of sacrificial anode and the protection effects and construction volumes of different sacrificial anode schemes for the offshore pile foundation platform in shallow sea provides guidance for the design of sacrificial anode cathodic protection of the offshore pile foundation platform. The anode-to-sea resistance and the protection effects of different protection schemes in the design of the sacrificial anode cathodic protection system for the offshore pile foundation platform are simulated and calculated with BEASY CP software. The results show that in the sea area of the offshore pile foundation platform, the anode-to-sea resistances are close and small when single sacrificial anode is placed above 0.25 m of sea water/mud interface and below 1.35 m of sea water surface. Such resistances are about 0.048 Ω, which is about 26% higher than that calculated by the standard recommended formula. The anode-to-sea resistance of multiple anodes combination decreases with the increase of anode number or anode spacing. However, due to crowding effect, it is significantly higher than that of ideal parallel connection resistance for multiple anodes. A total of six sacrificial anode schemes with different combined anodes in different locations are given where the sacrificial anodes are placed at 0.8 m away from the sea water/mud interface with single and multiple anodes. The calculation results show that the protection potential distribution range of pile foundation platform under different sacrificial anode schemes is close, which is between ‒680 mV and ‒1080 mV (CSE). The difference of protection effect of different schemes is mainly reflected in the protection of main piles and risers in highly corrosive areas including the sea and near the sea water/mud interface. With the transformation of anode from five combined anodes scheme and three combined anodes scheme to single anode scheme, the total output current of sacrificial anodes increases from 110 to 133 A. The protection distance of main pile in sea mud increases from 5~8 m to 5~10 m, and the protection distance of riser in sea mud increases from 0~3 m to 4~7 m. The maximum output current of the two anodes in scheme 1 of five combined anodes is about twice that of the middle anode, and the output current of each sacrificial anode in scheme 2 of three combined anodes is equivalent. The number, combination and position of sacrificial anode can be optimized to achieve more uniform protection potential distribution with numerical simulation. In this paper, the three combined anode schemes 2 proposed have the characteristics of protection effect, uniformity of anode output current and relatively small construction amount, which can be used as the recommended scheme for sacrificial anode cathodic protection of offshore pile foundation platform. |
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