Buried pipeline cathodic protection device and method

Abstract

The invention discloses a novel cathode protection device of buried pipeline, and belongs to the technical field of electric power. The method aims at analyzing defects existing in the aspect of long-distance pipeline of traditional cathode protection, innovation is carried out on the basis of sacrificial anode and current cathode protection technology, and the novel cathode protection device andmethod of the buried pipeline for the sacrificial anode and current cathode protection are researched and developed. The device comprises a power supply, a potentiostat, an auxiliary anode, a reference electrode, a cathode protection connection contact point and a quasi-solid electrolyte of the novel cathode combined protection device of the buried pipeline. The device is simple and convenient, solar power generation system is used as the cathode protection power supply, a cathode protection station and a laying cable do not need to be built, can be put into a field power-free cathode protection project at any time, so that engineering cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric power. Background technique [0002] The buried pipelines of thermal power plants in China are mostly made of carbon steel, the pipelines have a long transmission distance, the soil environment is complex and changeable, the inner wall has no anti-corrosion measures, and the outer wall is painted with petroleum asphalt anti-corrosion coating. Due to the continuous corrosion of the inner wall by the water quality in the pipe and the continuous corrosion of the outer wall by the external soil, the quality of the anti-corrosion layer of some pipelines cannot meet the design standards, the construction is not standardized, and the anti-corrosion measures are not in place. During the long-term operation, the corrosion factors and buried The long-term effect of the pipeline has caused serious corrosion of the buried pipeline. [0003] The commonly used anti-corrosion measures for buried pipelines incl...

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Problems solved by technology

Due to the long construction period of the pipeline, the cathodic protection project cannot be carried out at the same time as the main project, and the cathodic protection project can only start after the buried pipeline project is completed, which increases the construction volume and cycle; for the old pipeline with frequent leaks, the cathodic protection project is added more difficult

[0006] The traditional cathodic protection process is cumbersome, requiring the establishment of a cathodic protection station, which limits the application of cathodic protection engineering; the soil between the auxiliary anode and the pipeline is used as the electrolyte, which is greatly affected by the environment, and the soil resistance is unstable, resulting in large fluctuations in the cathodic protection potential. Current density is difficult to control; faults are difficult to troubleshoot. After the test pile and anode grounding bed are damaged, they cannot be seen from the ground surface, and the specific location of the damaged pipe section cannot be judged; Component power supply, after the cable is damaged, it is impossible to accurately determine the location of the damage, and it is also impossible to accurately find out whether the fault is on the test pile or the cable, which increases the difficulty of troubleshooting and brings difficulties to equipment maintenance.

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