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| Corrosion Behavior of Gas-Liquid-Solid Multiphase Flow on Flange Joints |
| Received:March 27, 2019 Revised:April 15, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2019.09.018 |
| KeyWord:flange joint CFD flow field electrochemical rate erosion rate |
| Author | Institution |
| YANG Ting |
NO.3 Engineering Branch Company, China Petroleum Pipeline Engineering Co., Ltd, Zhengzhou, , China |
| LAN Guo-lin |
NO.3 Engineering Branch Company, China Petroleum Pipeline Engineering Co., Ltd, Zhengzhou, , China |
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| Abstract: |
| Objective To explore the corrosion rate in crevice of flange joints. Methods Based on CFD numerical simulation software, this paper studied the corrosion rate of flange joints, including the flow field, electrochemical and erosion corrosion rate. Results The velocity distribution at the flange joint in the above study conditions can be divided into two stages of 0-0.6 mm and 0.6-5 mm in the direction of joint depth, and there were obvious pressure gradient layer and temperature gradient layer on the surface of the flange joint. Meanwhile, with the increase of the mass flow rate of solid impurities, the corrosion rate at the flange increased linearly; and when the mass flow rate was greater than 4 kg/s, the corrosion rate reached the maximum. The velocity of sand-containing fluid and corrosion rate are normally distributed. Conclusion Therefore, the corrosion of flange joints under the gas-liquid-solid multiphase flow condition is mainly caused by the interaction of electrochemical corrosion and erosion corrosion, and its erosion corrosion rate is much higher than the electrochemical corrosion rate. |
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