Prediction of Corrosion in Artificial Gas Pipelines Based on a Two-fluid Model

doi:10.11885/j.issn.1674-5086.2018.05.28.01

Abstract

Abstract: The pervasive corrosion induced by multiphase flow in artificial gas pipe networks is the main cause of the thinning of artificial gas pipelines. Existing techniques present difficulties for detecting the residual wall thickness of the pipelines used for conveying complex media. Using the gas pipeline network in Kunming as an example, in this study, we performed a multiphase flow analysis of the artificial gas pipeline network based on a two-fluid model. By combining experimental and theoretical research methods, we determined the corrosion characteristics of the artificial gas pipeline and calculated the corrosion condition of the pipeline. The results showed that the corrosion degree of pipeline was mainly related to the holdup rate of the liquid and the partial pressure of CO₂. The average corrosion rate calculated by the multiphase flow simulation model was 0.054 3 mm/a. Significant errors were found in the corrosion prediction results of the full dynamic multiphase flow simulation. Specifically, the average error of the model established for predicting the corrosion rate of artificial gas pipe network was 8.9%. This result was superior to the corrosion prediction obtained by full dynamic multiphase flow simulation.

Key words: artificial gas, pipeline, multiphase flow, corrosion rate, model

CLC Number:

TE985.8

SHANG Bojun, LI Changjun, HU Meilin. Prediction of Corrosion in Artificial Gas Pipelines Based on a Two-fluid Model[J]. 西南石油大学学报(自然科学版), 2018, 40(6): 148-156.

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