What is the principle of electrolysis descaling for circulating water?

Release time:

Mar 16,2022

Through a certain descaling installation, direct current is applied directly to the cooling circulating water. After electrolysis begins, heavy metal ions (including scale) in the water will adhere to the surface of the negative electrode in the electrolysis tank of the electrolysis descaling system. Then, the positive electrode and negative electrode are periodically reversed. After switching, the scale attached to the negative electrode falls off and is discharged together with the water outside the circulating water system. Under the condition of not reversing the polarity, a certain concentration of hydroxide ions and carbonate ions are generated in the cathode region.

Through a certain descaling installation, direct current is applied directly to the cooling circulating water. After electrolysis begins, heavy metal ions (including scale) in the water will adhere to the surface of the negative electrode in the electrolysis tank of the electrolysis descaling system. Then, the positive electrode and negative electrode are periodically reversed. After switching, the scale attached to the negative electrode falls off and is discharged together with the water outside the circulating water system. Under the condition of not reversing the polarity, a certain concentration of hydroxide ions and carbonate ions are generated in the cathode region.

This prompts the calcium and magnesium ions in the water to separate from the hydroxide and carbonate ions, forming calcium hydroxide, magnesium hydroxide, calcium carbonate, and magnesium carbonate, which adhere to the cathode shell to form a scale layer of a certain thickness. Since the cathode generates a certain amount of hydrogen, the scale on the shell is essentially loose and soft, so it can be cleaned thoroughly using physical scrapers and high-pressure water flushing. Additionally, due to the different hardness of water in different regions, there may be slight differences in the amount and form of scale collected on the cathode cylinder.

For the electrolysis descaling of cooling tower circulating water, under the influence of the electric field, chloride ions lose electrons and transform into free chlorine in the reaction area near the anode, accompanied by the production of trace amounts of ozone, hydroxyl radicals, and other strong oxidizing substances. These substances have an algicidal effect. This electrochemical method for treating circulating water can use an electrolysis descaling installation, which is directly placed in the water tank. The operation is convenient and requires no supervision. It only needs to be regularly cleaned based on the scale accumulation situation.

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