Simulation of Corrosion in Sulfur-containing Venting Pipelines Considering Wall Liquid Phase Distribution

doi:10.11885/j.issn.1674-5086.2023.10.07.01

Abstract

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

CLC Number:

TE83

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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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2023.10.07.01

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