Hand-held descaling device and descaling method for a voltage equalizing electrode based on ultrasonic waves

Abstract

The invention claims to protect a hand-held descaling device based on ultrasonic technology for equalizing electrodes of valve cooling water circuits, which belongs to the technical field of ultrasonic non-destructive removal. The voltage equalizing electrode descaling device proposed by the present invention mainly includes a current injection module, a scale layer thickness detection module, a high-frequency electric signal generation module, a power amplification module, and a transducer signal module. The thickness detection module measures the potential of the equalizing electrode by applying current excitation, and determines the thickness of the equalizing electrode scaling according to different measurement impedances. The ultrasonic adjustment module has a built-in Powell algorithm, which intelligently optimizes the high-frequency electrical signal generation module through the measured thickness information. The frequency of the signal, the amplification factor of the power amplifier module, and the ultrasonic action time achieve the optimal descaling effect; finally, the ultrasonic wave is output through the transducer module and the scale layer on the electrode surface is removed by the cavitation effect. In the past, the overhaul of the converter valve required sampling and dismantling of the equalizing electrodes.

Description

technical field [0001] The invention belongs to a cooling system of equipment in a high-voltage direct current power transmission system, in particular to a hand-held descaling device for equalizing electrodes based on ultrasonic waves and a descaling method Background technique [0002] In the UHV transmission system, the converter valve is not only the core equipment of the system, but also the weak link of the system. The converter valve will generate a lot of heat during the working process of the system, and its overheating is an important reason for the failure of the converter valve. More than 25% of the converter valve failures are caused by the valve cooling system. The cooling system of the converter valve is referred to as the valve cooling system. When the valve cooling system works, the cooling water takes away the heat to ensure that the temperature of the converter valve remains normal. In the converter valve, the potential of each metal component in the conv...

AI Technical Summary

Problems solved by technology

Scaling and detachment of electrodes will cause problems such as blockage of cooling water pipes, resulting in shutdown of the converter station due to failure of the valve cooling system

[0003] At present, the domestic method to solve the fouling of voltage equalizing electrodes is regular inspection and cleaning, but the method adopted is to remove the scales by the staff using mechanical means after dismantling the electrodes. Because the process of disassembling the equalizing electrodes is cumbersome, and the equalizing electrodes are repeatedly disassembled It is very easy to loosen the sealing gasket. When cleaning the voltage equalizing electrode, it is often checked by sampling. If the scale of the sample is not obvious, all electrodes will not be cleaned, which also causes serious safety hazards.

Images