石油化工设备技术 ›› 2022, Vol. 43 ›› Issue (2): 48-51.doi: 10.3969/j.issn.1006-8805.2022.02.010

• 腐蚀与防护 • 上一篇    

浅谈常减压装置常顶回流工艺及腐蚀控制

张海宁   

  1. 中国石油化工股份有限公司天津分公司装备研究院,天津 300271
  • 收稿日期:2021-10-24 接受日期:2022-02-28 出版日期:2022-03-15 发布日期:2022-03-15
  • 作者简介:张海宁,男,2008年毕业于河北工业大学化学工程与工艺专业,学士,主要从事装置RBI风险分析及设备腐蚀调查分析工作,工程师,已发表论文3篇。

Reflux Process and Corrosion Control at the Top of Atmospheric Tower of Atmospheric and Vacuum Equipment

Zhang Haining   

  1. Equipment Research Institute of SINOPEC Tianjin Company, Tianjin, 300271
  • Received:2021-10-24 Accepted:2022-02-28 Online:2022-03-15 Published:2022-03-15

摘要: 为解决常减压装置常压塔塔顶(简称常顶)腐蚀及塔顶循环系统的腐蚀问题,将常压塔顶由冷回流工艺改为热回流工艺。改造之后,腐蚀部位发生了明显转移,其中常压塔顶换热器之后的压力管道发生了严重腐蚀减薄,另外空冷管束也发生了腐蚀泄漏,严重影响了装置长周期平稳运行。文章分别对常顶冷回流工艺和热回流工艺下发生的腐蚀现象进行分析,结合实际情况对两种回流工艺的优缺点进行探讨,并提出了控制腐蚀的建议。

关键词: 常减压装置, 冷回流, 热回流, 腐蚀

Abstract: In order to solve the corrosion problem of the atmospheric pressure tower top and the corrosion problem of the top circulation system of the atmospheric and vacuum unit of a factory, the atmospheric pressure tower top was changed from a cold reflux process to a hot reflux process. After the revamp, the corroded parts have shifted significantly. Among them, the pressure pipeline behind the atmospheric tower top heat exchanger has severely corroded and thinned, and the air-cooled tube bundle has corroded and leaked, which affected the long-term stable operation of the device seriously. This paper analyzes the corrosion phenomena that occur under the constant-top cold reflux process and the constant-top hot reflux process respectively. Then it discusses the advantages and disadvantages of the two reflux processes based on the actual situation and proposes corrosion control recommendations.

Key words: atmospheric and vacuum distillation unit, cold reflux, heat reflux, corrosion