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| The Dynamic Deposition Behavior of Grading Electrode in Converter Valve Cooling System Considering Electro-Velocity-Mass Transfer Field |
| He Tingting1, Gao Bing1, Yang Fan1, Song Xiaoning2, Cheng Yijie2, Liu Chao3 |
1. State Key Laboratory of Power Transmission Equipment & System Security and New TechnologySchool of Electrical Engineering Chongqing University Chongqing 400044 China;
2. State Grid Zhejiang Electric Power Corporation Research Institute Hangzhou 310000 China ;
3. College of Power Engineering Chongqing University Chongqing 400044 China |
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Abstract The water cooling system is essential to the heat dissipation of ultra-high voltage converter station devices, and it is also one of the weak components of converter valve. Statistics show that more than 66% failures of water cooling system are associated with sediment deposition. Different from other industries heat exchanger systems that are mainly caused by solubility saturation of electrolyte, the sediment deposition on the grading electrode of converter valve is contributed by electrochemical reaction, which is affected by electrical field, turbulence field and mass transfer field. Therefore, in this paper, the dynamic deposition behavior on grading electrode is investigated under electro-turbulence-mass transfer coupling field. Additionally, the influence of turbulence, species diffusion and sediment deformation growth process is considered. Firstly, the deposition mechanism of grading electrode is discussed based on XRD and SEM measurement results, and then the mathematical model coupling electrochemical reaction-electrolyte concentration-turbulence field is proposed. In addition, the arbitrary Lagrangian-Eulerian (ALE) deformation model is proposed to describe the sediment deposition process and its influence on the coupling fields. The proposed method is verified by the measurement results, which indicates the dynamic sediment deposition behavior agrees well with the experimental results. Besides, the deposited sediment decreases the reaction current and aggravate the voltage balance ability, and the distorted voltage is over 110V.
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Received: 23 July 2018
Published: 29 July 2019
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2019, Vol. 34 
