Case analysis of electrochemical water quality stabilization technology for circulating cooling water system

doi:10.19965/j.cnki.iwt.2023-0164

Abstract

Abstract:

Scale deposits and metal corrosion in circulating cooling water systems can lead to reduced heat transfer efficiency and increased energy consumption in circulating water systems，seriously affecting the safe and stable operation of industrial production. This paper takes the electrochemical descaling equipment of a plant’s circulating water system as a case study，and provides a basis for the application of electrochemical technology for the treatment of circulating cooling water by analyzing its treatment effects and economic benefits. Operational results from the site show that the electrochemical descaling equipment used in the plant can effectively improve water quality，prevent scaling and control the corrosion of the circulating cooling water system. It can reduce 4.38×10⁵ t of water recharge and discharge from the circulating water system each year，and significantly reduce the amount of chemicals added. Economic calculations show that the electrochemical descaling equipment can save approximately 2.129 million yuan per year.

Key words: circulating cooling water, electrochemical descaling, water quality stabilization technology

摘要：

水垢沉积和金属腐蚀会导致循环冷却水系统传热效率下降和能耗增加，严重影响工业生产的安全稳定运行。以某厂循环水系统的电化学除垢设备为案例，通过分析其处理效果和经济效益，为电化学技术处理循环冷却水的应用推广提供依据。现场所得运行数据表明，该厂所采用的电化学除垢设备能够有效改善水质，防止结垢，控制循环冷却水系统的腐蚀情况。每年减少循环水系统补水量和排污量各4.38×10⁵t，并显著降低药剂投加量。经济核算显示该电化学系统每年可节省约212.9万元。

关键词: 循环冷却水, 电化学除垢, 水质稳定技术

CLC Number:

TQ085

Yanjin ZHANG, Zekun ZHANG, Xing XU, Yingqiang HAN, Xian GAO, Bo JIANG, Hao Xu. Case analysis of electrochemical water quality stabilization technology for circulating cooling water system[J]. Industrial Water Treatment, 2024, 44(2): 184-189.

张延进, 张泽坤, 徐星, 韩英强, 高宪, 江波, 徐浩. 循环冷却水系统的电化学水质稳定技术案例分析[J]. 工业水处理, 2024, 44(2): 184-189.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0164

https://www.iwt.cn/EN/Y2024/V44/I2/184

Figures/Tables 8

Table 1 Circulating water quality conditions

项目	补充水（均值）	循环水
pH	7.2	8.04
电导率/（μS·cm^-1）	782	3 870
硬度（以CaCO₃计）/（mmol·L^-1）	3.24	13.44
碱度/（mmol·L^-1）	1.73	2.64
氯离子/（mg·L^-1）	76.7	737.36
浊度/NTU	1.53	23.36
钙离子/（mg·L^-1）	78.47	346.29

Fig.1 Process flow diagram for electrochemical descaling equipment

Fig.2 Monthly average of heat exchanger operating data

Fig.3 Graph of the variation in the ratio of circulating water parameters to supplementary water by month

Fig.4 Corrosion diagram for hanging sheets

Fig.5 Graph of changes in total iron

Fig.6 Statistical chart of added agents

Table 2 Economic benefits analysis

项目	收益/（万元·a^-1）
合计	~212.9
药剂费	~90
补水费	~116.5
循环水排污处理费	~87.6
人工、设备材料费	~-68.6
电费	~-12.6

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