考虑壁面液相分布的含硫放空管道内腐蚀模拟

doi:10.11885/j.issn.1674-5086.2023.10.07.01

摘要/Abstract

摘要： 为更准确地进行高含硫天然气场站放空管道的检测工作，采用CFD对低压放空管道进行数值模拟和现场相结合的方法，深入分析低压放空管道中不同截面下的流场分布规律、液相分布规律和硫化氢分布规律，从而预测低压放空管道内腐蚀敏感性区域，研讨壁面液相分布变化对高含硫天然气场站低压放空管道内腐蚀的影响。结果表明，高含硫天然气场站放空管道中液相的分布是导致内腐蚀的关键因素，管道入口处第2个连续弯头的45?和90?截面的3～12～9点钟方向+6点钟方向以及三通处支管口的6～9点钟方向往往是整条管道腐蚀最严重的位置；在现场检测时优先考虑弯头和三通处，若这两处壁厚变化在轻度腐蚀范围内，可省去水平段的检测；若三通处的壁厚变化超出轻度腐蚀的范围，应主要对水平段6点钟方向进行检测。研究结果有效解决了高含硫天然气场站放空管道中定位内部腐蚀位置困难的问题。

关键词: 高含硫天然气场站, 放空管道, 壁面液相分布, 内腐蚀位置预测, 数值模拟

Abstract: In order to carry out more accurately inspection of the venting pipeline of high sulfur natural gas field station, we use the CFD method to simulate the low-pressure venting pipeline with the combination of numerical simulation and on-site method, to deeply analyze the flow field distribution law, the liquid phase distribution law, and the distribution law of hydrogen sulfide in the different cross sections in the low-pressure venting pipeline, so as to predict the area of the low-pressure venting pipeline sensitive to internal corrosion, and to discuss the effect of changes of the distribution of the liquid phase at the wall surface on the internal corrosion of the high sulfur natural gas field station. The influence of liquid phase distribution changes on the wall surface on the internal corrosion of low-pressure vent pipelines in high sulfur natural gas stations was investigated. The results show that: the distribution of liquid phase in the venting pipeline of high sulfur natural gas station is the key factor leading to internal corrosion, and the 3～12～9 o'clock+6 o'clock directions of the 45° and 90° section of the second consecutive elbow at the entrance of the pipeline, as well as the 6～9 o'clock directions of the branch mouth at the tee, tend to be the most serious corrosion locations of the whole pipeline; when inspecting on-site, priority will be given to elbows and tees, and the wall thicknesses of the elbow and tee will be changed within the range of mild corrosion. If the wall thickness of these two places is within the range of mild corrosion, the detection of straight pipe section can be omitted. If the wall thickness at the tee varies beyond mild corrosion, the straight section should be tested primarily in the 6 o'clock direction. The results of the study effectively solved the problem of difficult to locate the internal corrosion position of the venting pipeline in high sulfur natural gas field station.

Key words: high sulfur natural gas field station, venting pipeline, wall liquid phase distribution, internal corrosion location prediction, numerical simulation

中图分类号:

TE83

彭星煜, 廖一鸿, 徐一彬, 龚建华, 申俊. 考虑壁面液相分布的含硫放空管道内腐蚀模拟[J]. 西南石油大学学报(自然科学版), 2025, 47(5): 181-194.

PENG Xingyu, LIAO Yihong, XU Yibin, GONG Jianhua, SHEN Jun. Simulation of Corrosion in Sulfur-containing Venting Pipelines Considering Wall Liquid Phase Distribution[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(5): 181-194.

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