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

ZHANG Dongling, LIU Bingyan, YAN Zhenxing, WANG Lida, NIU Xing, HAO Anfeng, LIU Guichang

doi:10.16577/j.issn.1001-1560.2022.0330

Materials Protection >

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

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

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

Expand

(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

Fold

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

Cite this article

ZHANG Dongling, LIU Bingyan, YAN Zhenxing, WANG Lida, NIU Xing, HAO Anfeng, LIU Guichang . Analysis on Corrosion Failure of Air Cooler of Hot Low - Pressure Separator for Diesel Upgrading Unit[J]. Materials Protection, 2022 , 55(11) : 203 -208 . DOI: 10.16577/j.issn.1001-1560.2022.0330

Options

Outlines

模态框（Modal）标题

Abstract

Cite this article