A corrosion failure analysis of heat exchanger tubes operating in petrochemical refinery

被引：41

作者：

Rezaei, Milad ^{[1
]}

Mahidashti, Zeynab ^{[1
]}

Eftekhari, Sajad ^{[1
]}

Abdi, Ehsan ^{[1
]}

机构：

[1] Amirkabir Univ Technol, Dept Mat & Met Engn, Hafez Ave,POB 15875-4413, Tehran, Iran

来源：

ENGINEERING FAILURE ANALYSIS | 2021年 / 119卷

关键词：

Erosion-corrosion; Heat exchanger; Crude methanol; Hard chromium coating; EROSION-CORROSION; STAINLESS; STEEL;

D O I：

10.1016/j.engfailanal.2020.105011

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The aim of this study was to analyze corrosion failure of heat exchanger tubes used in petrochemical refinery. Thermodynamic and kinetics analysis showed that the major chemical substance playing role in electrochemical corrosion of the tubes is solute CO2 present in crude methanol passing by the tubes. However, polarization tests revealed that corrosion caused by CO2 is not so significant to produce cavities observed on the outer surface of the tube. By further investigation of the morphology and previous processes in producing crude methanol, it was revealed that crude methanol contains significant amount of suspended solid particles with relatively high hardness, which were detached from the catalysts of the previous phases. Therefore, besides the electrochemical corrosion, the main mechanism of tubes corrosion was attributed to the erosion-corrosion. According to the corrosion cause, appropriate methods were proposed for corrosion prevention or corrosion reduction of the tubes.

引用

页数：10

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