| BAI Li,SHANG Peng-cheng,LIU Qiang,DONG Xiang-wei.Experimental Analysis and Protection Scheme of Erosion of Solid-liquid Two-phase Pipeline[J],51(10):218-225, 292 |
| Experimental Analysis and Protection Scheme of Erosion of Solid-liquid Two-phase Pipeline |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.10.022 |
| KeyWord:submarine pipeline erosion protection scheme elbow solid particles two phase flow |
| Author | Institution |
| BAI Li |
China University of Petroleum, Shandong Qingdao , China |
| SHANG Peng-cheng |
China University of Petroleum, Shandong Qingdao , China |
| LIU Qiang |
CSSC Huangpu Wenchong Shipbuilding Company Limited, Guangzhou , China |
| DONG Xiang-wei |
China University of Petroleum, Shandong Qingdao , China |
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| Abstract: |
| The work aims to analyze the effects of fluid parameters, sand parameters, and pipeline structure on the erosion of solid-liquid two-phase flow elbows, and design an anti-corrosion and wear-reduction protection scheme for elbows. The effects of flow velocity, particle size and particle shape on the erosion rate of the elbow were analyzed through the circulating pipeline test method, and the effects of the gradual expansion protection scheme on the flow field of the elbow were explored through numerical simulation. According to the test results of the mass loss rate method, under the X80 steel pipe structure with a mass flow rate of 2.5% and a sand diameter of 20-40 mesh, the mass loss rate of the patch after erosion was 6.85%. After analysis, the main damage characteristics of the test patch surface were summarized as:the erosion rate of the outer wall of the elbow was higher than that of the inner wall, and the mass loss rate of the two side walls was between the two. The effects of 3∶4, 3∶5 and 1∶2 gradual expansion pipe on erosion were studied by numerical simulation. The erosion rate of 1∶2 gradual expansion pipe decreased by about 30% at a high flow rate of 2.5 m/s, and the effect was the most obvious; When the fluid flow rate was lower than 0.5 m/s, the deposition of particles with a particle size of 200 μm increased the local wear of the outer wall of the elbow. Sharp particles and spherical particles had different erosion effects on the wall, and the simulated wall impact was obviously different. The flow in the elbow section is a typical three-dimensional spiral flow. The area near the outer wall of the pipe in the elbow section is a high-pressure and low-velocity area, while the additional flow on the inner side wall is a low-pressure and high-speed area. In the process of erosion-corrosion interaction, the local damage mechanism of the outer wall surface of the pipeline is mainly due to the accumulation of erosion and abrasion caused by repeated impacts of solid particles, and the damage mechanism of the inner wall surface is more pronounced by corrosion. The solid particles are subject to axisymmetric shear action of secondary flow along the pipe wall, which mainly contributes to the ploughing and abrasion of the two sides of the pipe wall. The particle shape also affects the wall damage mechanism, and the same particle with different impact angles will significantly change the maximum impact stress on the wall. The protection scheme is to use gradually expanded round pipe in the elbow section. This scheme can reduce the flow rate of the fluid in the pipeline when passing through the area, and at the same time, the flow rate of solid particles is reduced, thereby reducing the impact of particles on the wall. The numerical experiment results show that the flow velocity and turbulence intensity of the fluid passing through the elbow can be reduced by a certain proportion of the gradual expansion section within a certain range of particle size and flow velocity, and the erosion rate can be reduced. |
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