单相流条件下90°水平弯管冲刷腐蚀行为研究

doi:10.11902/1005.4537.2019.002

中国腐蚀与防护学报

2020, Vol. 40

Issue (2): 115-122 DOI: 10.11902/1005.4537.2019.002

研究报告

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单相流条件下90°水平弯管冲刷腐蚀行为研究

胡宗武¹, 刘建国²(

), 邢蕊³, 尹法波⁴

1 兰州理工大学石油化工学院兰州 730050
2 中国石油大学 (华东) 储运与建筑工程学院青岛 266580
3 兰州中检科测试技术有限公司兰州 730070
4 青岛欧赛斯环境与安全技术有限责任公司青岛 266580

Erosion-corrosion Behavior of 90^o Horizontal Elbow in Single Phase Flow

HU Zongwu¹, LIU Jianguo²(

), XING Rui³, YIN Fabo⁴

1 College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2 College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, China
3 Lanzhou Testing Technology Co. , Ltd. of Chinese Academy of Inspection and Quarantine, Lanzhou 730070, China
4 Qingdao OASIS Environmental & Safety Technology Co. , Ltd, Qingdao 266580, China

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摘要:

通过自行设计的管流式实验装置，采用失重测量、表面分析等方法，研究了单相流条件下90°水平弯管不同部位的冲刷腐蚀行为。结果表明：单相流条件下，90°水平弯管不同部位的冲刷腐蚀速率主要集中在2.11~3.29 mm/a，弯管的内侧及出口处的外侧冲刷腐蚀比较严重。流动条件下的冲刷腐蚀速率远远大于静止条件下的纯腐蚀速率，机械冲刷对腐蚀过程起到促进作用，介质流动是引起冲刷腐蚀速率大大增加的主要原因。试样表面存在面积较大的冲刷腐蚀坑点和沟槽，沟槽具有明显的方向性，沟槽的方向与局部流体流动的方向一致。

关键词 ：单相流, 90°水平弯管, 冲刷腐蚀, 交互作用, 腐蚀形貌

Abstract：

Single phase flow induced erosion-corrosion behavior of 90-degree horizontal elbow was investigated via a loop test device designed independently by means of weight loss measurement and surface analysis methods. The results indicate that the erosion-corrosion rates at different locations of the 90-degree horizontal elbow are different, which vary between 2.11 and 8.90 mm/a. The erosion-corrosion is more serious at the inner part of the elbow and the outer part nearby its outlet. The erosion-corrosion rates induced by single phase flow of 3.5% (mass fraction) NaCl solution are much higher than that in static solution for 20# steel, in other word, the fluid flush promotes the corrosion process, therefore, which is responsible to the significant increase of erosion-corrosion rates. As a consequence, pits and grooves emerged on the surface of steel pieces situated around the inner surface of the elbow, while the grooves show clearly preferred orientation, i.e. their longitudinal axis is consistent with the flow direction of local fluid.

Key words： single phase flow 90-degree horizontal elbow erosion-corrosion erosion-corrosion interaction corrosion morphology

收稿日期: 2019-01-07

ZTFLH:

TG172.2

基金资助:国家自然科学基金(51301201);山东省自然科学基金(ZR2019MEM014)

通讯作者: 刘建国 E-mail: liujianguo@upc.edu.cn

Corresponding author: LIU Jianguo E-mail: liujianguo@upc.edu.cn

作者简介: 胡宗武，男，1989年生，硕士

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引用本文:

胡宗武, 刘建国, 邢蕊, 尹法波. 单相流条件下90°水平弯管冲刷腐蚀行为研究[J]. 中国腐蚀与防护学报, 2020, 40(2): 115-122.
Zongwu HU, Jianguo LIU, Rui XING, Fabo YIN. Erosion-corrosion Behavior of 90^o Horizontal Elbow in Single Phase Flow. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 115-122.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.002 或 https://www.jcscp.org/CN/Y2020/V40/I2/115

图1 管流式实验装置示意图

图2 测试弯管剖视图

图3 弯管角度及试样编号示意图

图4 封装试样后的测试弯管实物图

图5 弯管不同部位的冲刷腐蚀速率

图6 环向角φ=90°与φ=270°方向清除腐蚀产物前不同试样表面的冲刷腐蚀形貌

图7 环向角φ=90°与φ=270°方向清除腐蚀产物后不同试样表面的冲刷腐蚀形貌

图8 水平弯管上典型试样的2D及3D冲刷腐蚀形貌

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