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Method for electrochemically removing scale from platinum electrodes of ultrahigh-voltage direct-current converter valves

A technology of ultra-high voltage direct current and platinum electrodes, which is applied in chemical instruments and methods, electrochemical water/sewage treatment, special treatment targets, etc., and achieves the effects of low price, simple operation and broad application prospects

Inactive Publication Date: 2017-01-04
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an electrochemical descaling method for the platinum electrode of the UHV DC converter valve to solve the problem of low descaling efficiency and long time consumption of the platinum electrode of the UHV DC converter valve. , Incomplete descaling, and chemical methods may cause damage to equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) During the annual power outage maintenance of the cooling water system in the converter valve of a ±500kV converter station, open the exhaust valve of the water inlet pipe at the top of the cooling water system in the converter valve until the water is discharged, and confirm that the internal cooling water system is full of water ;

[0027] (2) Open the pressure regulating valve on the nitrogen tank of the internal cooling water system to maintain the pressure of the expansion tank at 0.5MPa, and then quickly close the inlet and outlet valves of the main circulation pump of the internal cooling water system;

[0028] (3) Starting from the bottom of the pole I-Y / Δ-B valve tower, number the scaled platinum electrodes of the converter valve according to 1, 2, 3..., and then connect the two platinum electrodes 1 and 2 to the potentiostat cathode and anode terminals;

[0029] (4) Adjust potentiostat voltage 100mV, carry out electrochemical polarization to platinum elec...

Embodiment 2

[0034] (1) with example 1 (1);

[0035] (2) Open the pressure regulating valve on the nitrogen tank of the internal cooling water system to maintain the pressure of the expansion tank at 1.0MPa, and then quickly close the inlet and outlet valves of the main circulation pump of the internal cooling water system;

[0036] (3) Starting from the bottom of the pole II-Y / Y-A valve tower, number the scaled platinum electrodes of the converter valve according to 1, 2, 3..., and then connect the two platinum electrodes 1 and 2 to the potentiostat cathode and anode terminals;

[0037] (4) Adjust potentiostat voltage 500mV, carry out electrochemical polarization to platinum electrode, polarization time is 5min;

[0038] (5) with example 1 (5);

[0039] (6) After all the scaled platinum electrodes are polarized, disassemble the drain pipe at the bottom of the valve tower, use the nitrogen pressure and the gravity of the water to quickly discharge the scaled water, and purge the pipe wit...

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Abstract

The invention discloses a method for electrochemically removing scale from platinum electrodes of ultrahigh-voltage direct-current converter valves. The method includes steps of (1), assuredly filling internal water cooling systems with water in periods when the internal water cooling systems of the converter valves of ultrahigh-voltage converter stations stop working; (2), respectively connecting the platinum electrodes at the bottoms of valve towers with cathode and anode wiring ends of constant-potential rectifiers, electrochemically polarizing the platinum electrodes and draining water with the scale after the platinum electrodes are completely polarized. The method has the advantages that the scale can be removed in a batch manner at the speed higher than the manual scale removal speed; the method is high in scale removal efficiency, low in risk and cost and easy to implement, is safe and reliable and has a broad application prospect, and the scale can be thoroughly removed by the aid of the method.

Description

technical field [0001] The invention belongs to the field of descaling platinum electrodes of converter valves, and in particular relates to an electrochemical descaling method suitable for platinum electrodes of UHV DC converter valves. Background technique [0002] UHV DC transmission undertakes the important task of power transmission and cross-regional networking of large energy bases. It is an important means to achieve optimal energy allocation. It is related to the safe and stable operation of large power grids, and ensuring its long-term safe and reliable operation is of great significance. The converter valve is the core equipment of UHV DC transmission. The water cooling system of the converter valve is an important part of the converter valve. It discharges the power consumption and heat of each component on the valve body to the outside of the valve hall to ensure the operating temperature of the thyristor. In the normal range, it plays a very important role in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46
CPCC02F1/4602C02F2303/22
Inventor 徐松刘凯冯兵查方林吴俊杰周舟王凌
Owner STATE GRID CORP OF CHINA
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