电解参数对循环冷却水处理及倒极除垢效果的影响

利用电化学法处理循环冷却水,探究电解参数对处理效果的影响,并探究不同倒极条件对阴极结垢的剥离效果和剥离方式。结果表明,当水质硬度为800 mg/L、Cl-质量浓度为567.2 mg/L、电流密度为10 mA/cm2、水力停留时间为10 min时,硬度去除质量浓度为300 mg/L,Cl-去除质量浓度为140 mg/L,活性氯质量浓度为8.74 mg/L,电流效率为88.44%;在除垢时间为8 min,倒极电流密度为5 mA/cm2的条件下,阴极结垢剥离率达到了94.3%,以物理脱落为主。倒极电流密度过高会造成水质硬度上升,除垢时间过长会造成电极腐蚀。

Influence of electrolysis parameters on the treatment of circulating cooling water and the descaling effect of reversing electrodes

The electrochemical method is used to treat the circulating cooling water,and the influence of the electro-lysis parameters on the treatment effect was investigated.The descaling effect and mechanism of reversing electrodes were studied under different conditions.The results showed that when the hardness concentration was 800 mg/L,the chloride ion concentration was 567.2 mg/L,the current density was 10 mA/cm2,and the hydraulic retention time was 10 min,the hardness removal concentration was 300 mg/L,the chloride ion concentration was 140 mg/L,the active chlorine concentration was 8.74 mg/L,and the current efficiency was 88.44%;When the descaling time was 8 min and the reversal current density was 5 mA/cm2,the cathodic scale was detached mainly by physical shedding,and the stripping rate reached 94.3%.The higher reverse current density caused the rise of the hardness of the water,and if the scale removal time was too long,the electrode will corroded.