Effect by Electrolysis for Dissolution and Precipitation of Calcite Scale in Cooling Water Line of Heat Exchange System
- Key words
- scale, calcite, electrolysis process, precipitation rate, dissolution rate, pH
- Conference
- New Zealand Geothermal Workshop
- Year
- 2008
- Session
- Chemistry
- Language
- English
Full text
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Abstract
A high-frequency electrolysis method was used to reduce the calcium in a circulating cooling water line by precipitating calcite on the electrodes. Therefore, this electrolysis system was useful to remove calcite scales in the flow line. In super-saturation solution for CaCO3, Ca and HCO3 concentration 100 mg/l solution, calcite scale on the stainless plate in the flow line dissolved with pH decreasing using electrolysis power supply. In contrast, no power supply, calcite precipitated more on stainless plate with pH slightly increasing.
When power supply, average dissolution rate was about 0.1 mg/m2/s and changed with pH decreased.
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