Converter valve single valve section parallel cooling waterway system

Abstract

The invention relates to a converter valve single valve section parallel cooling waterway system, which is characterized in that a plurality of voltage-sharing electrodes are respectively arranged at an inner cooling water inlet end and an inner cooling water outlet end of a single valve section parallel water cooling pipeline, and problems of serious corrosion and deposition of the voltage-sharing electrodes caused by the fact that only one voltage-sharing electrode is arranged at the end part of each collecting pipe in the prior art are solved. The effect of clamping the potential in water by the voltage-sharing electrode is enhanced, the corrosion and deposition speed of the voltage-sharing electrode are inhibited, and the operation stability and safety of a converter valve cooling water path system are improved.

Description

technical field [0001] The invention relates to the technical field of converter valves, in particular to a parallel cooling water circuit system for a single valve section of a converter valve. Background technique [0002] The converter valve is the core equipment of the DC transmission project. Due to the valve loss, the heat generated by the valve loss must be effectively dissipated to ensure the normal operation of the converter valve. The thyristor temperature junction of the converter valve is generally required to be less than 90°C. Therefore, through internal The aluminum alloy radiator which is in close contact with the thyristor is cooled by cold water to realize heat dissipation of the thyristor. In order to avoid discharge due to uneven distribution of voltage on the inner and outer walls of the cold water pipeline in the converter valve, and leakage current caused by the contact between the metal equipment in the valve assembly and the water circuit, installati...

AI Technical Summary

Problems solved by technology

According to the analysis, the scaling of the equalizing electrode caused the failure of the equalizing electrode, and the electrolysis of water at the root of the electrode produced ozone to corrode the sealing ring and cause water leakage.

From 2005 to 2006, there were 6 leakage and overheating accidents of valve components in the Guangzhou converter station. The analysis shows that during the process of manual electrode descaling, some electrode scaling fell into the water distribution pipeline, blocking the reactor waterway, resulting in reactor overheating and water leakage

However, the actual operation results show that the corrosion of the aluminum radiator is obvious. The structure of the cooling water system with a single valve section in the traditional converter valve is as follows: figure 1 As shown, it can be seen that only one equalizing electrode is set at the end of each manifold. According to the theoretical analysis and simulation research of Maxwell’s equations, it is shown that: because the three-dimensional structure of the cooling water system of the converter valve is not completely centrosymmetric, As a result, the effect of a single equalizing electrode in the traditional waterway structure to clamp the water potential is not ideal. The potential in the water pipes does not change uniformly, and each branch pipe still contains a large amount of leakage current, so that the corrosion of the aluminum radiator is still very serious. , which in turn leads to serious corrosion and deposition problems of the voltage equalizing electrodes, and even blockage of the cooling water system, which seriously threatens the safety of the converter valve operation

Images