石油化工设备技术 ›› 2021, Vol. 42 ›› Issue (2): 56-61.doi: 10.3969/j.issn.1006-8805.2021.02.013

• 腐蚀与防护 • 上一篇    下一篇

天然气净化装置脱硫单元腐蚀机理及案例分析

包振宇1,张 杰2,王团亮2,段永锋1   

  1. 1.中石化炼化工程(集团)股份有限公司洛阳技术研发中心,河南 洛阳 471003;
    2.中国石油化工股份有限公司中原油田分公司,河南 濮阳 457000
  • 接受日期:2021-02-25 出版日期:2021-03-16 发布日期:2021-03-16
  • 作者简介:包振宇,男,2015年毕业于天津大学化学工程专业,博士,主要从事石油天然气设备防腐研究工作,现任专业副总工程师,高级工程师,曾获中石化科技进步三等奖1项,已发表论文5篇。Email:baozhenyu.segr@sinopec.com
  • 基金资助:
    中国石化科技开发项目(No.:317017-14)

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

Bao Zhenyu1, Zhang Jie2, Wang Tuanliang2, Duan Yongfeng1   

  1. 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

摘要: 脱硫单元是天然气净化装置中腐蚀问题最多的单元,腐蚀机理主要分为 H2S-CO2-H2O 腐蚀和RNH2-H2S-CO2-H2O 腐蚀两大类。.随着奥氏体不锈钢逐步应用于脱硫单元的设备和管道中,H2S-CO2-H2O 腐蚀问题得以部分缓解,但是随着气源的劣质化,胺液中氯离子含量的升高使得腐蚀风险更为隐蔽和突出。文章从脱硫工艺过程出发,绘制了腐蚀流程示意图,并依据腐蚀类型,选取了脱硫单元的典型腐蚀案例,利用硬度检测、化验分析、微观观察等手段,剖析了腐蚀产生的原因,并提出了适用于脱硫单元腐蚀防控的措施及建议,旨在提高企业的防腐经验,保障装置的平稳运行。

关键词: 天然气, 脱硫, 腐蚀, 胺液, 酸性气

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