Deterioration of economizer tube in utility boiler

Subramanian, Chidambaram

doi:10.1016/j.engfailanal.2020.104643

Cited by 17 publications

(3 citation statements)

References 30 publications

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“…High 1) will be reused in downstream refinery units and utility plant after water treatment. 35,36 Opportunity crude containing toxic components pollutes the refinery waste water and H 2 S stripped in sour water unit to produce elemental sulfur. 37…”

Section: Resultsmentioning

confidence: 99%

“…The leakage and accidents in overhead locations can be prevented with combined effect of metallurgy up‐gradation, efficient desalting process, improvements in corrosion inhibitor and process design. The refinery waste water can be treated to remove Cl & H 2 S, and the extracted water (refer Figure 1) will be reused in downstream refinery units and utility plant after water treatment 35,36 . Opportunity crude containing toxic components pollutes the refinery waste water and H 2 S stripped in sour water unit to produce elemental sulfur 37…”

Section: Resultsmentioning

confidence: 99%

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Corrosion prevention of crude and vacuum distillation column overheads in a petroleum refinery: A field monitoring study

Subramanian

2020

Process Safety Progress

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The aim of the present work is to monitor dew point corrosion of crude and vacuum distillation column overhead section in a petroleum refinery. The material of construction of overhead line pipe was carbon steel. The state of art of crude unit process was introduced. The corrosion and associated hydrolyzing mechanisms were briefly described. The crude processing in a petroleum refinery was extremely dynamic and thus field monitoring attempts were made, which provides some useful information on structural integrity of column downstream equipments. The demulsifier, neutralizer, and corrosion inhibitor were mixed in crude unit at specific locations for corrosion prevention. Field monitoring includes evaluation of pH and chloride content of desalter extracted water and overhead condensed water, Base Sediment & Water (BS&W) and chloride content of as-received & desalted crude, and iron content of overhead condensed water. Furthermore, corrosion coupon was installed in overhead section to obtain the actual corrosion rate. All the field study was conducted for a specified period. The acidity, chloride concentration, and iron loss of condensed water confirmed that acidic corrosion was under control. The corrosion rate of the installed coupons confirmed that corrosion rate was within the specified limit. The results revealed in this paper intended for refinery operators and corrosion engineers involved in understanding of actual process parameters in prevention of overhead acidic corrosion. K E Y W O R D Sacidic HCl, aqueous corrosion, crude oil refining, naphthenic acid corrosion, refinery overhead corrosion | INTRODUCTION AND BACKGROUND INFORMATIONCorrosion always occurs in petroleum refining process especially in crude unit which process crude oil that constitutes different boiling point and molecular weight of long chain hydrocarbon. Major impurities in crude oil are chloride salts, sulfur compounds, and carbon-dioxide gases. [1][2][3] The chloride salts could be in form of 75% NaCl, 15% MgCl, and 10% CaCl approximately. Further crude contain various acidic components including organic acids (R[CH 2 ] n COOH, R is cyclopentane or cyclohexane, n > 12) and mineral acids (H 2 S, HCN, & CO 2 ) collectively referred as naphthenic acids, and measured in Total Acidic Number (TAN, mg KOH/g). The main types of corrosion occurs in crude unit of petroleum refinery are naphthenic acid corrosion (NAC), sulfidation, hydrochloric acid (HCl) corrosion, ammonium chloride (NH 4 Cl) corrosion, ammonium bi-sulfide (NH 4 HS) corrosion, polythonic acid stress corrosion cracking (PASCC) and oxidation corrosion (rust formation). 2,[4][5][6] The size and structure of naphthenic acid decides corrosion severity between 180 C and 400 C, which could be operating temperature of heat exchanger, heater tube outlets, transfer lines, distillation column especially at flash zones and reflux lines of crude processing unit. The presence of elemental sulfur, mercaptans (RSH),

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Corrosion prevention of crude and vacuum distillation column overheads in a petroleum refinery: A field monitoring study

Subramanian

2020

Process Safety Progress

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“…The software enabled one to process the data and compute moments of the velocities (mean, root mean square, turbulence intensity). The intrinsic error of the equipment used here was assessed in a previous work by Subramanian (1995) by measunng the speed at one point on the radius of a spinning plexiglass disc, knowing the motor speed used to rotate the disc. The intrinsic error appeared to be G%.…”

Section: Choprer IV -Previous Studies and Czirrent Workmentioning

confidence: 99%

Numerical Simulation of Corrosion Product Deposition on Heat Exchanger Surfaces

Callamand¹,

Basset²,

Lister³

2023

Proceeding of Proceedings of an International Conference on Mitigation of Heat Exchanger Fouling and Its Economic and Environme

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The author has granted a nonexclusive licence allowing the National Library of Canada to reproduce, loan, distribute or sel1 copies of this thesis in microform, paper or electronic formats.L'auteur a accordé une licence non exclusive permettant à la Bibliothèque nationale du Canada de reproduire, prêter, distribuer ou vendre des copies de cette thèse sous la forme de rnicrofiche/nlm, de reproduction sur papier ou sur format électronique.The author retains ownership of the L'auteur conserve la propriété du copyright in this thesis. Neither the droit d'auteur qui protège cette thèse. thesis nor substantial extracts fkom it Ni la thèse ni des extraits substantiels may be printed or othewise de celle-ci ne doivent être imprimés reproduced without the author's ou autrement reproduits sans son permission.autorisation.

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