天然气净化装置脱硫单元腐蚀机理及案例分析

doi:10.3969/j.issn.1006-8805.2021.02.013

Petro-chemical Equipment Technology ›› 2021, Vol. 42 ›› Issue (2): 56-61.doi: 10.3969/j.issn.1006-8805.2021.02.013

• CORROSION AND PROTECTION • Previous Articles Next Articles

Corrosion Mechanism and Case Analysis of Desulfurization Unit in Natural Gas Purification Plant

Bao Zhenyu¹, Zhang Jie², Wang Tuanliang², Duan Yongfeng¹

1. SINOPEC Engineering GROUP Luoyang R&D Center of Technologies, Luoyang, Henan, 471003;
2. SINOPEC Zhongyuan Oilfield Company, Puyang, Henan, 457000

Accepted:2021-02-25 Online:2021-03-16 Published:2021-03-16

Abstract

Abstract: Desulfurization unit has the most corrosion problems in natural gas purification plant. The corrosion mechanisms can be mainly divided into two categories, i.e., H₂S-CO₂-H₂O corrosion and RNH₂-H₂S-CO₂-H₂O corrosion. As austenitic stainless steels are gradually used in the equipment and pipelines of desulfurization units, problems caused by H₂S-CO₂-H₂O corrosion are partially alleviated. However, with the deterioration of the gas sources, the chloride ion content in the amine solution increases, which makes the corrosion risk less visible and more prominent. In this paper, a corrosion flowsheet was drawn based on the desulfurization process, and typical corrosion cases were selected according to the corrosion mechanisms. By using hardness testing, laboratory analysis, microscopic observation, etc., the root causes of corrosion were dissected. And the measures and suggestions for corrosion alleviation and control were proposed in order to improve the anti-corrosion experience of enterprises and ensure the smooth operation of the devices.

Key words: natural gas, desulfurization, corrosion, amine liquid, acid gas

Bao Zhenyu, Zhang Jie, Wang Tuanliang, Duan Yongfeng. Corrosion Mechanism and Case Analysis of Desulfurization Unit in Natural Gas Purification Plant[J].Petro-chemical Equipment Technology, 2021, 42(2): 56-61.

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Corrosion Mechanism and Case Analysis of Desulfurization Unit in Natural Gas Purification Plant

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