Corrosion and Protection Technique of Regeneration Tower Bottom Reboiler in Natural Gas Purification Unit

doi:10.11902/1005.4537.2021.224

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 699-704 DOI: 10.11902/1005.4537.2021.224

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Corrosion and Protection Technique of Regeneration Tower Bottom Reboiler in Natural Gas Purification Unit

GAO Qiuying¹^,²(

), XU Yixuan³, HU Pengwei¹, YAO Tianwan¹, QI Wenlong⁴

^1.SINOPEC Northwest Company of China Petroleum and Chemical Corporation, Urumqi 830011, China
^2.Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, CNPC, Urumqi 830011, China
^3.Russian National University of Petroleum and Natural Gas, Gubkin 119991, Russia
^4.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

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Abstract

Regeneration tower bottom reboiler is the key equipment for the desulfurization and decarbonization process of sour natural gas purification unit. With the incearsing tendency in processing raw gases of inferior quality, the corrosion of the reboiler and relevant parts is becoming more serious, which not only affects the normal operation of natural gas purification plant, but also has a great safety hidden danger. In this paper, aiming at the serious leakage of tube bundles and plates of regeneration tower bottom reboiler in natural gas purification unit, the inducement mechanism and influencing factors of corrosion in reboiler were clarified through comprehensive investigation of field service conditions and information about the production process, and assissted with proper electrochemical assessment. Moreover, the feasible countermeasures were put forward to ensure long-term safe operation of the equipment to the greatest extent.

Key words: reboiler desulfurization and decarburization corrosion mechanism protection measure

Received: 01 September 2021

ZTFLH:

TG174

Fund: National Science and Technology Major Project(2016ZX05053);China Petrochemical Key Project Research(319016-5)

Corresponding Authors: GAO Qiuying E-mail: gaoqy.xbsj@sinopec.com

About author: GAO Qiuying, E-mail： gaoqy.xbsj@sinopec.com

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Cite this article:

GAO Qiuying, XU Yixuan, HU Pengwei, YAO Tianwan, QI Wenlong. Corrosion and Protection Technique of Regeneration Tower Bottom Reboiler in Natural Gas Purification Unit. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 699-704.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.224 OR https://www.jcscp.org/EN/Y2022/V42/I4/699

Fig.1 Potentiodynamic polarization curves of materials served in reboilers at in MDEA amine solution at 100 ℃ (a), 110 ℃ (b), 120 ℃ (c), 130 ℃ (d), 140 ℃ (e), 150 ℃ (f), 160 ℃ (g), 170 ℃ (h), 180 ℃ (i) and 190 ℃ (j)

Fig.2 Variation of corrosion potential (a) and corrosion current density (b) with temperature of materials served in reboilers in simulated MDEA solution

Fig.3 Corrosion morphologies of 20# steel (a), Q245 steel (b) and 16Mn steel (c) after immersion in MDEA amine solution for 10 d 100 ℃ (a1-c1), 120 ℃ (a2-c2), 140 ℃ (a3-c3), 160 ℃ (a4-c4) and 180 ℃ (a5-c5)

Fig.4 Schematic diagram of sacrificial anode protection for corrosion of tube bundles in reboilers

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