Lab Scale Evaluation of Circulating Cooling Water Hardness Removing Applied DSA Anode

Jiao-ping WANG, Gang ZHANG, Jian-yong YU

Abstract


In industrial production, calcium ions in water can cause scaling on the surface of heat exchanger in circulating cooling water system, resulting in problems such as reduced heat transfer efficiency, increased energy consumption and shortened service life of equipment. The surface of DSA electrode is coated with oxide coating, and its conductivity and catalytic performance are greatly improved compared with traditional electrode. The effects of current density, inter-electrode distance and electrolysis time on the hardness of circulating cooling water degraded by DSA electrodes were discussed. In the experiment, when the current density increases from 50A/m2 to 250A/m2, the removal rate of calcium ions increases continuously, with the highest removal rate of 53.7%. When the distance between anode and cathode plates increases from 2cm to 10cm, the removal rate of calcium ions decreases from 72.60% to 32.80%. When the raw water is electrolyzed for 10 minutes, the removal rate rises to 58.6%. As time goes on, the removal rate will not change. The experimental results provide valuable practical basis for the removal of calcium ions in circulating cooling water, and provide powerful data support for the optimal operation of the process.

Keywords


Water Hardness Removing, Current Density, Inter-electrode Distance, Electrolysis, Dimensionally Stable Anode


DOI
10.12783/dteees/icepe2019/28933

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