Corrosion failure of titanium tubes of a heat exchanger for the heating of dissolving lye

2021 ◽  
Vol 129 ◽  
pp. 105722
Author(s):  
Valentin Romanovski ◽  
Yolanda S. Hedberg ◽  
Andrei Paspelau ◽  
Vitali Frantskevich ◽  
James J. Noël ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Corrosion Failure

Analysis on the corrosion failure of U-tube heat exchanger in hydrogenation unit

2021 ◽  
pp. 105448
Author(s):  
Xiaofei Liu ◽  
Haiyan Zhu ◽  
Chenyang Yu ◽  
Haozhe Jin ◽  
Chao Wang ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Corrosion Failure ◽  
Tube Heat Exchanger

Corrosion Failure of Aluminum Heat Exchanger Tubes

2015 ◽  
Vol 15 (4) ◽  
pp. 541-547 ◽  
Author(s):  
D. Ifezue ◽  
F. H. Tobins
Keyword(s):  
Heat Exchanger ◽  
Corrosion Failure

A Case Study: Corrosion Failure of Tube Heat Exchanger

2015 ◽  
Vol 4 (0) ◽  
pp. 57 ◽  
Author(s):  
Ibrahim Ghayad ◽  
Zeinab Abdel-Hamid ◽  
Nasser Gomaa
Keyword(s):  
Heat Exchanger ◽  
Corrosion Failure ◽  
Tube Heat Exchanger

scholarly journals Crystallization Behavior of Ammonium Chloride in High-Pressure Heat Exchanger of Hydrotreating Unit

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Jianwen Zhang ◽  
Fan Zhang ◽  
Yan Li ◽  
Yahui Zhao ◽  
Gang Sheng
Keyword(s):  
Mass Transfer ◽  
High Pressure ◽  
Heat Exchanger ◽  
Ammonium Chloride ◽  
Volume Fraction ◽  
Flow Direction ◽  
Corrosion Cracking ◽  
Inlet Temperature ◽  
Corrosion Failure ◽  
Chloride Deposition

In view of the corrosion failure of a high-pressure heat exchanger in a diesel hydrogenation unit, the formation mechanism of ammonium chloride in a multiphase flow system is investigated in this article. Numerical simulation is carried out by user defined function (UDF) on the process of adding source of mass transfer in computational fluid dynamics (CFD) solvers. The distribution characteristics of ammonium chloride are illustrated by the parameters including crystallization temperature of ammonium chloride, volume fraction of ammonium chloride, and mass transfer rates of NH3 and HCl, and the causes of corrosion cracking in the U-shaped bend of the heat exchanger are discussed. The results show that there is a great risk of ammonium chloride deposition in the heat exchanger from 4.5 m away from the outlet of the second pass. The crystallization area in the tube gradually expands from the wall to the center along the flow direction, and the crystallization rate is higher near the tube wall. The field sampling test results show that the corrosion cracking is hydrogen-induced cracking, which is due to the existence of large amount of hydrogen, high impacting force, excessive flow rate, and the risk of ammonium chloride particle erosion at the U-bend. In order to alleviate the corrosion of ammonium chloride deposition, some improvement measures are put forward, such as raising the inlet temperature of the tube side to 215 °C and increasing the water injection by 30%, which play an important role in decreasing the formation of ammonium chloride in the heat exchange system.

An investigation on corrosion failure of a shell-and-tube heat exchanger in a natural gas treating plant

2020 ◽  
Vol 118 ◽  
pp. 104918
Author(s):  
H. Panahi ◽  
A. Eslami ◽  
M.A. Golozar ◽  
A. Ashrafi Laleh
Keyword(s):  
Heat Exchanger ◽  
Natural Gas ◽  
Corrosion Failure ◽  
Tube Heat Exchanger ◽  
Shell And Tube

Corrosion Failure Analysis on Heat Exchanger Pipes

2017 ◽  
Vol 17 (2) ◽  
pp. 349-353 ◽  
Author(s):  
Zheng Qiankun ◽  
Shi Yafei ◽  
Rao Sixian ◽  
Li Huifeng ◽  
Zhu Xingjiang
Keyword(s):  
Heat Exchanger ◽  
Failure Analysis ◽  
Corrosion Failure Analysis ◽  
Corrosion Failure

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

2021 ◽  
Vol 119 ◽  
pp. 105011
Author(s):  
Milad Rezaei ◽  
Zeynab Mahidashti ◽  
Sajad Eftekhari ◽  
Ehsan Abdi
Keyword(s):  
Heat Exchanger ◽  
Failure Analysis ◽  
Corrosion Failure Analysis ◽  
Corrosion Failure

scholarly journals Analysis of Multiphase Flow and Heat and Mass Transfer for Ammonium Chloride Crystallization of the High-Pressure Heat Exchanger in Hydrogenation Unit

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7754
Author(s):  
Jianwen Zhang ◽  
Yahui Zhao ◽  
Yan Li ◽  
Fan Zhang
Keyword(s):  
Mass Transfer ◽  
High Pressure ◽  
Heat Exchanger ◽  
Multiphase Flow ◽  
Gas Phase ◽  
Heat And Mass Transfer ◽  
Ammonium Chloride ◽  
Tube Bundle ◽  
Corrosion Failure ◽  
Petrochemical Enterprise

The corrosion failure of the high-pressure heat exchanger in a petrochemical enterprise was simulated. A multiphase flow and heat and mass transfer simulation shows that the vortex core with a higher gas phase content and lower temperature is the region of easy crystallization, located on both sides of the center of the tube. The crystallization process occurs in the gas phase. As the reaction progresses, the crystallization range spreads from the tube wall to the center of the tube bundle, and the inner diameter of the tube bundle decreases continuously. In Fluent, a user-defined function, based on the ammonium chloride crystallization reaction, is loaded. The results show that crystallization first occurs in the tube bundles on both sides of the center of the tube and that the corrosion is aggravated by the erosion wall surface of crystal particles at the elbow, which is consistent with the actual corrosion failure location.

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