柴油改质装置热低分空冷器腐蚀失效分析

张冬玲, 刘炳岩, 闫振星, 王立达, 牛星, 郝安峰, 刘贵昌

doi:10.16577/j.issn.1001-1560.2022.0330

材料保护 >

2022 , Vol. 55 >Issue 11: 203 - 208

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0330

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柴油改质装置热低分空冷器腐蚀失效分析

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¹大连理工大学化工学院； ²山东京博石油化工有限公司

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

收稿日期: 2022-05-16

网络出版日期: 2023-12-26

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Analysis on Corrosion Failure of Air Cooler of Hot Low - Pressure Separator for Diesel Upgrading Unit

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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: 2022-05-16

Online published: 2023-12-26

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摘要

柴油改质装置热低分空冷器在服役过程中15CrMo螺旋换热管出现明显的泄漏失效现象。通过基材和腐蚀产物成分分析以及CFD仿真模拟分析，探究了该空冷器的腐蚀成因。研究结果表明，该螺旋管腐蚀失效的原因主要是空冷器在服役期间，由于热膨胀导致螺旋管之间直接接触，而发生换热管间的热传导，改变了壁面的温度分布，使得接触处壁面产生局部过冷现象，最终管内高温流体骤冷发生凝结而引起的露点腐蚀失效。基于以上腐蚀成因，提出相关防护建议。

关键词： 柴油改质装置; 热低分空冷器; 露点腐蚀; 失效

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张冬玲, 刘炳岩, 闫振星, 王立达, 牛星, 郝安峰, 刘贵昌 . 柴油改质装置热低分空冷器腐蚀失效分析[J]. 材料保护, 2022 , 55(11) : 203 -208 . DOI: 10.16577/j.issn.1001-1560.2022.0330

Abstract

The spiral heat exchange tube made by 15CrMo stainless steel suffered from obvious leakage failure during service period at the air cooler of hot low - pressure separator for diesel upgrading unit. Corrosion causes of the air cooler were investigated by analyzing the composition of substrate and corrosion products and CFD simulation analysis. Research result showed that the corrosion failure of the spiral tubes was mainly caused by the direct contact between the spiral tubes due to thermal expansion during the service period of the air cooler, and the heat conduction between heat exchange tubes occurred, which changed the temperature distribution of the wall surface, causing local supercooling of the wall surface at the contact point. Finally, the sudden cooling of high - temperature fluid in the tubes caused condensation, causing dew point corrosion failure. Based on the above corrosion cause, corresponding protective recommendations were put forward.

Key words： diesel upgrading unit; air cooler of hot low - pressure separator; dew point corrosion; failure

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