| CHEN Yi-ming,DONG Mei,WANG Bo,LIU Hong-da,WANG Xing-tong.#$NPFlow-assisted Corrosion Simulation of Natural Gas Pipeline Flow Containing Sour Dissolved Gas[J],51(8):298-306 |
| #$NPFlow-assisted Corrosion Simulation of Natural Gas Pipeline Flow Containing Sour Dissolved Gas |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.08.026 |
| KeyWord:acidic dissolved gas natural gas pipeline gas/liquid two-phase flow flow-assisted corrosion wall shear stress CFD simulation |
| Author | Institution |
| CHEN Yi-ming |
Liaoning Petrochemical University, College of Petroleum Engineering, Liaoning Fushun , China |
| DONG Mei |
Liaoning Petrochemical University, College of Petroleum Engineering, Liaoning Fushun , China |
| WANG Bo |
Faculty of Engineering and Applied Science, University of Regina, Regina Saskatchewan SK S4S 0A2, Canada |
| LIU Hong-da |
Liaoning Petrochemical University, College of Petroleum Engineering, Liaoning Fushun , China |
| WANG Xing-tong |
Liaoning Petrochemical University, College of Petroleum Engineering, Liaoning Fushun , China |
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| Abstract: |
| To study the flow-assisted corrosion (FAC) phenomenon formed under the combined influence of acid gas (CO2) and water phase in natural gas pipelines. Based on the theory of computational fluid dynamics, the gas/liquid integrals and wall shear stress distributions that affect FAC under different conditions are determined. For upwardly inclined pipelines, the water phase mainly accumulates at the bottom of the pipeline, and the thickness of the water phase is inversely proportional to the flow velocity and proportional to the water content. When the flow velocity is less than 3m/s and the water content is greater than 30%, the water phase will flow back. The liquid in the straight pipeline before and after the elbow will accumulate toward the elbow, which greatly increases the thickness of the water phase accumulated at the elbow. For downwardly inclined pipelines, the location of water phase accumulation and the relationship with the flow velocity and water content are the same as those of upwardly inclined pipelines. The difference is that there is no backflow phenomenon in downwardly inclined pipelines. Under the same conditions, the wall shear stress of the upwardly inclined pipeline is always greater than that of the downwardly inclined pipeline. When the water content and the bending angle are constant, the maximum wall shear stress of the upwardly inclined pipeline appears at the bottom of the elbow, but as the flow velocity increases, the maximum wall shear stress gradually migrates to the straight pipeline after the elbow. The maximum wall shear stress of the downwardly inclined pipeline appears at the top of the elbow and does not change with the increase of the flow velocity. When the flow velocity and the bending angle are constant, the law of the maximum wall shear stress of the upwardly inclined pipeline and the downwardly inclined pipeline is the same as the law of constant water content. When the flow velocity and water content are constant, the bending angle has a greater influence on the wall shear stress of the upwardly inclined pipelines and has a smaller influence on the downwardly inclined pipelines. For upwardly inclined pipelines, with the increase of the bending angle, the concentrated position of the maximum wall shear stress gradually extends from the bottom of the elbow to the straight pipeline after the elbow and spreads all over the pipeline. For downwardly inclined pipelines, the maximum wall shear stress is mainly concentrated on the top of the bend and the straight pipeline after the elbow, and as the bending angle increases, the value increases but the position does not change. By analyzing the distribution of the accumulated water phase and the concentration position of the wall shear stress, it can be known that for the upwardly inclined pipeline, the two action areas approximately overlap, that is, the upwardly inclined pipeline will be severely affected by FAC. For downwardly inclined pipelines, the two action areas do not overlap. The upper part of the pipeline is mainly affected by local erosion and corrosion, and the lower part is mainly affected by local electrochemical corrosion, that is, the down-dip pipeline will not be affected by FAC. |
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