A device and method for descaling cold water outside the cooling system of a DC converter valve

Abstract

The invention relates to an external cold water descaling device for a direct-current converter valve cooling system and a method. The external cold water descaling device comprises a descaling tank, a direct-current power source, an electrode, an ultrasonic generator and a scale residue collection tank, a cathode and an anode of the electrode are corresponding connected with a cathode and an anode of the direct-current power source, the electrode is fixedly mounted in the descaling tank, the ultrasonic generator is mounted on the descaling tank, the scale residue collection tank is mounted at the bottom of the descaling tank, and the bottom of the descaling tank is open. The method includes: fixedly mounting the electrode with the descaling tank, and applying low voltage on the electrode; enabling calcium and magnesium ions of spraying water to be in chemical reaction at the cathode of the electrode to generate fouling; applying vibration of certain frequency on the electrode, and adjusting vibration frequency of the ultrasonic generator to vibration frequency identical when the fouling is adhered on the electrode to enable the fouling to shed into the scale residue collection tank. Through the descaling device and the method, scaling ions in spraying water can be removed, and the scaling problem of a cooling tower in a convertor station is solved.

Description

technical field [0001] The invention relates to a device and a method for a DC power transmission system, in particular to a device and method for descaling external cold water in a DC converter valve cooling system. Background technique [0002] The converter valve is the core equipment of the DC transmission project. By sequentially connecting the three-phase AC voltage to the DC terminal to obtain the desired DC voltage and realize power control, its value accounts for about 22-25% of the total price of the complete set of equipment in the converter station. . [0003] The design of the converter valve applies the latest technology and research results of power electronics technology, light-controlled conversion technology, high-voltage technology, control technology and pressure equalization technology, cooling technology, and high-voltage insulating materials. The main technical difficulty lies in: the converter valve temporarily The establishment of the state simulati...

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Problems solved by technology

[0006] In the field of converter valves, the current monitoring items for the water quality of the DC converter valve cooling system mainly include: conductivity, pH (only a few converter stations monitor), dissolved oxygen, temperature, these data indicators are few, and for Regular testing has led to the problem of fouling of cooling tower coils in many domestic converter stations

The fouling of the cooling tower coil will greatly reduce the heat transfer efficiency of the cooling tower, resulting in a high temperature of the internal cooling water. If the margin of the cooling tower is insufficient, it will easily cause the valve temperature to be too high and trip, causing serious consequences

[0007] In the water treatment industry, there have been small electrochemical descaling instruments. However, they mainly adopt a circular tube structure, and the amount of descaling is small, and it is inconvenient to clean. It is difficult to apply to the cooling system of the diverter valve with a large amount of water. External cooling water descaling

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