The Research on Corrosion in High-Sulfur Gas Purification Plants

doi:10.11885/j.issn.1674-5086.2013.10.20.02

Abstract

Abstract:

A high-sulfur natural gas purification plant can process 120×108 m3 feed gas，in which the mole fraction of H2S and
CO2 reach 14% and 8%，respectively. Production facilities and equipment in the high-sulfur natural gas purification plant are
at severe risk of corrosion for the high content of acidic components and large capacity load. Considering the characteristics of
the plant，we adopted the inductors（DG–9500）to monitor the corrosion in 14 detection points distributed in desulfurization，
dehydration，sulfur recovery，tail gas treatment，sour water stripping unit. Through a one-year corrosion detection，we obtained
the degree of corrosion in the process nodes，combined which with the corrosion coupon results，we found the corrosion weaknesses
of this gas purification plant. The results showed that the corrosion mainly occurred in the amine regeneration system，
sulfur recovery systems and chilled water cooling systems. The corrosion types include general corrosion，localized corrosion
and pitting. It was also found that the results obtained from inductive probes and corrosion coupons were almost the same，
which indicates that the former detective method can be used to monitor the corrosion conditions effectively in the high-sulfur
natural gas plants. The research provides an important basis for corrosion detection in the high-sulfur purification plants.

Key words: high-sulfur gas fields, purification, on-line corrosion, corrosion monitoring, corrosion coupons

Zeng Dezhi1, Shang Jianfeng2, Long Decai3, Liu Yuanzhi2, Wang Tuanliang2. The Research on Corrosion in High-Sulfur Gas Purification Plants[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.10.20.02.

0
/ / Recommend

Add to citation manager EndNote|Ris|BibTeX

URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2013.10.20.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2014/V36/I6/135

References

[1] 裴爱霞，张立胜，于艳秋，等. 高含硫天然气脱硫脱碳

工艺技术在普光气田的应用研究[J]. 石油与天然气化

工，2012，41（1）：17–23.

Pei Aixia，Zhang Lisheng，Yu Yanqiu，et al. Application

and research of high sulfur content gas desulfurization and

decarbonization process on Puguang Gas Field[J]. Chemical

Engineering of Oil & Gas，2012，41（1）：17–23.

[2] 吴基荣，毛红艳. 高含硫天然气净化新工艺技术在普

光气田的应用[J]. 天然气工业，2011，31（5）：99–102.

Wu Jirong，Mao Hongyan. Application of new technologies

on high-H2S gas conditioning in the Puguang Gas

Field[J]. Natural Gas Industry，2011，31（5）：99–102.

[3] 张强，唐永帆，谷坛. 川渝气田净化厂脱硫装置腐蚀

监测技术研究及应用[J]. 石油与天然气化工，2010，

39（6）：548–551，556.

[4] 李峰，孙刚，张强，等. 天然气净化装置腐蚀行为与防

护[J]. 天然气工业，2009，29（3）：104–106.

Li Feng，Sun Gang，Zhang Qiang，et al. Corrosion behavior

and prevention of gas sweetening unit in natural gas

processing plants[J]. Natural Gas Industry，2009，29（3）：

104–106.

[5] 陈赓良. 醇胺法脱硫脱碳装置的腐蚀与防护[J]. 石油化

工腐蚀与防护，2005，22（1）：27–31.

Chen Gengliang. Corrosion of alcohol-amine desulfurization

decarbonization units and protection[J]. Petrochemical

Corrosion and Protection，2005，22（1）：27–31.

[6] Rooney P C，Bacon T R，Dupart M S. Effect of heat stable

salts on MDEA solution corrosivity：Part 1&2[J]. Hydrocarbon

Processing，1997，76（4）：65–71.

[7] 曹生伟，夏莉，术阿杰，等. 普光净化厂尾气处理

装置运行优化[J]. 石油与天然气化工，2012，41（3）：

281–284.

Cao Shengwei，Xia Li，Shu Ajie，et al. Operation optimization

of tail gas treatment unit in Puguang natural gas

purification plant[J]. Chemical Engineering of Oil & Gas，

2012，41（3）：281–284.

[8] 孙丽丽. 高硫天然气净化处理技术的集成开发与工业

应用[J]. 中国工程科学，2010，12（10）：76–81.

Sun Lili. Integrated investigation and industrial application

of sour nature gas treatment technology[J]. Engineering

Sciences，2010，12（10）：76–81.

[9] Veawab A，Tontiwachwuthikul P，Chakma A. Corrosion

behavior of carbon steel in the CO2 absorption process

using aqueous amine solutions[J]. Industrial & Engineering

Chemistry Research，1999，38（10）：3917–3924.

[10] 胡兴民，朱天寿，张书成，等. 靖边气田天然气脱

硫装置腐蚀行为研究[J]. 天然气工业，2007，27（5）：

121–123.

Hu Xingmin，Zhu Tianshou，Zhang Shucheng，et al. Corrosion

performance study on natural gas desulfurization

unit in the Jingbian Gasfield[J]. Natural Gas Industry，

2007，27（5）：121–123.

[11] 肖生科，廖忠陶，刘强. 硫磺回收装置优化运行技术策

略[J]. 石油炼制与化工，2010，41（4）：22–26.

Xiao Shengke，Liao Zhongtao，Liu Qiang. Optimization

of the operation of sulfur recovery unit[J]. Petroleum Processing

and Petrochemicals，2010，41（4）：22–26.

[12] 张平喜. 硫磺回收装置的腐蚀与防护[J]. 全面腐蚀控

制，2005，19（5）：36–39.

[13] 李文戈，尹莉，金华峰. 硫磺回收冷凝冷却器腐蚀原

因分析及防腐对策[J]. 石油大学学报：自然科学版，

2001，25（5）：69–72.

[14] Schmitt G. Effect of elemental sulfur on corrosion in sour

gas systems[J]. Corrosion，1991，47（4）：285–307.

[15] 岑嶺，李洋，温崇荣，等. 硫磺回收及尾气处理装置

的腐蚀与防护[J]. 石油与天然气化工，2009，38（3）：

217–221.

Cen Ling，Li Yang，Wen Chongrong，et al. Corrosion and

protective measures of sulfur recovery & tail gas treatment

plant[J]. Chemical Engineering of Oil & Gas，2009，

38（3）：217–221.

[16] 董飞，张豪，吴智信，等. 双相不锈钢的磨损腐蚀与

空泡腐蚀研究进展[J]. 全面腐蚀控制，2009，23（1）：

16–18.

Dong Fei，Zhang Hao，Wu Zhixin，et al. Research

progress on erosion-corrosion and cavitation erosion of

duplex stainless steel[J]. Total Corrosion Control，2009，

23（1）：16–18.

[17] 曹文全，韩晓兰，赵景峰. 普光天然气净化厂脱硫系

统腐蚀及其防护措施[J]. 化学工业与工程技术，2011，

32（6）：57–60.

Cao Wenquan，Han Xiaolan，Zhao Jingfeng. Corrosion study

and protection of desulfurization system in Puguang

natural gas purification plant[J]. Journal of Chemical Industry

& Engineering，2011，32（6）：57–60.

[18] Fang H，Brown B，Young D，et al. Investigation of elemental

sulfur corrosion mechanisms[J]. Corrosion，2011，

1–13.

[19] 李学翔. 硫磺尾气处理装置腐蚀与防护技术[J]. 石油化

工环境保护，2006，29（2）：61–64.

Li Xuexiang. Corrosion of sulfur and tail gas treatment

plant and its protection technology[J]. Environmental Protection

in Petrochemical Industry，2006，29（2）：61–64.

[20] 金华峰. 硫磺回收装置中冷凝冷却器的腐蚀和防护[J].

腐蚀与防护，2001，22（4）：169–172.

[21] Chao C，Lin L，Macdonald D. A point defect model for

anodic passive films[J]. Journal of the Electrochemical Society，

1981，128（6）：1187–1194.