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<p>The slurry bed hydrogenation process is being increasingly and widely utilized, and corrosion leaks frequently occur in the slurry bed residue hydrogenation unit. In response to the cracking phenomenon in a slurry bed residue hydrogenation, this article analyzed the reasons for the cracking failure of the tee from four aspects: nondestructive testing, mechanical performance analysis, microstructure analysis, and&#xa0;stress&#xa0;analysis, based on the experimental&#xa0;perspective&#xa0;and the finite element simulation method. The results indicate that the three-way pipe fitting (tee) underwent severe high-temperature hydrogen damage and hydrogen embrittlement on the inner wall of the pipeline in a high-temperature hydrogen environment, leading to severe decarburization and microcracks at grain boundaries. Cracking occurred at the shoulder of the three-way fitting, where high-temperature hydrogen corrosion and residual stress concentration were most severe. This study will supplement the database of failure cases of slurry bed residue hydrogenation unit, based on which design optimization and failure prevention will be possible.</p>

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Research on the Failure Mechanism of Pipeline Tee Cracking in Slurry Bed Hydrogenation System

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Jiyang Liu,
  • Mao Cheng,
  • Shuangsheng Yan,
  • Zhigang Shen,
  • Guogen Huang

摘要

The slurry bed hydrogenation process is being increasingly and widely utilized, and corrosion leaks frequently occur in the slurry bed residue hydrogenation unit. In response to the cracking phenomenon in a slurry bed residue hydrogenation, this article analyzed the reasons for the cracking failure of the tee from four aspects: nondestructive testing, mechanical performance analysis, microstructure analysis, and stress analysis, based on the experimental perspective and the finite element simulation method. The results indicate that the three-way pipe fitting (tee) underwent severe high-temperature hydrogen damage and hydrogen embrittlement on the inner wall of the pipeline in a high-temperature hydrogen environment, leading to severe decarburization and microcracks at grain boundaries. Cracking occurred at the shoulder of the three-way fitting, where high-temperature hydrogen corrosion and residual stress concentration were most severe. This study will supplement the database of failure cases of slurry bed residue hydrogenation unit, based on which design optimization and failure prevention will be possible.