污水汽提装置弯管冲刷腐蚀失效分析

闫振星, 刘炳岩, 张丕基, 王立达, 舒向泉, 贺永鹏, 李河金, 刘贵昌

doi:10.16577/j.issn.1001-1560.2022.0235

材料保护 >

2022 , Vol. 55 >Issue 8: 186 - 191

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0235

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污水汽提装置弯管冲刷腐蚀失效分析

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(1. 大连理工大学化工学院，辽宁大连 116024; 2. 山东京博石油化工有限公司, 山东滨州 256500)

王立达(1979-)，研究生，副教授，主要从事腐蚀失效分析与防护技术的研究，电话：13604080459，E - mail：ldwang@dlut.edu.cn

收稿日期: 2022-02-18

修回日期: 2022-03-29

录用日期: 2022-04-26

网络出版日期: 2023-12-17

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Erosion - Corrosion Failure Analysis of Elbows at the Sewage Stripper

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(1. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China;2. Shandong Chambroad Petrochemicals Co., Ltd., Binzhou 256500, China)

Received date: 2022-02-18

Revised date: 2022-03-29

Accepted date: 2022-04-26

Online published: 2023-12-17

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摘要

污水汽提装置316不锈钢弯管在服役过程中弯管弯头两侧和内脊处出现明显的局部减薄泄露现象。采用宏观检测、基材与腐蚀沉积物的电子能谱分析以及计算流体动力学(CFD)模拟对腐蚀原因进行分析。研究表明，引起该弯头处减薄的主要原因是热电偶的引流分隔造成后期流态分布不均，加之弯头处流向的突然变化导致局部流速过大而引起的冲刷腐蚀。基于以上腐蚀成因，提出了相关防护建议。

关键词： 冲刷腐蚀; 弯管; 失效; 污水汽提装置

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闫振星, 刘炳岩, 张丕基, 王立达, 舒向泉, 贺永鹏, 李河金, 刘贵昌 . 污水汽提装置弯管冲刷腐蚀失效分析[J]. 材料保护, 2022 , 55(8) : 186 -191 . DOI: 10.16577/j.issn.1001-1560.2022.0235

Abstract

During the service time of 316 stainless steel elbow of sewage stripper, obvious local thinning and leakage occurred on both sides and the inner ridge of the elbow bend. The causes of corrosion were analyzed by means of macroscopic examination, computational fluid dynamics (CFD) simulation, and electron energy spectrum analysis on substrate and corrosion sediment. Results showed that the main reasons for the local thinning at the bend were the uneven distribution of flow pattern in the later stage caused by the drainage separation of the thermocouple, and the erosion corrosion caused by the excessive local flow velocity due to the sudden change of the flow direction at the bend. Based on the above causes of corrosion, corresponding protective recommendations were put forward.

Key words： erosion - corrosion; elbow; failure; sewage stripper

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