以软化水为水源的循环冷却水水质控制技术

华电技术 ›› 2020, Vol. 42 ›› Issue (6): 16-21.

以软化水为水源的循环冷却水水质控制技术

中国大唐集团科学技术研究院有限公司华中电力试验研究院，郑州〓450000

出版日期:2020-06-25 发布日期:2020-06-23

Water quality control technology for circulating cooling water taking soft water as source

CentralChina Electric Power Test Research Institute,China Datang Corporation Science and Technology Research Institute Company Limited, Zhengzhou 450000, China

Online:2020-06-25 Published:2020-06-23

摘要/Abstract

摘要：

为了节约用水，同时保证机组安全运行，需要寻求循环冷却水最佳处理方案及运行工况。根据以软化水为补充水水源的冷却水系统特点，通过极限碳酸盐碱度法、腐蚀挂片失重法、动态模拟试验对4种缓蚀阻垢剂的性能进行了研究与评价。在动态模拟试验中采用控制“1/2Ca2++JDM”值代替传统冷却浓缩倍数与碱度浓缩倍数差值(ΔA值)来调整循环水系统排污，并考察了高SO42-含量循环水对冷却塔混凝土的侵蚀性。循环水浸泡混凝土试件20d后，溶液SO42-含量稳定，试件形貌并无改变。试验结果表明：QJ药剂具有优良的缓蚀阻垢性能，适用于以软化水为水源的循环冷却水系统；采用控制“1/2Ca2++JDM”值来预防循环水系统结垢是可行的；当循环水高浓缩倍数运行时，SO42-对混凝土中水泥和骨料侵蚀性不显著。

关键词:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">软化水, 循环冷却水, 水质控制, 阻垢缓蚀剂, 硫酸盐, 混凝土font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">

Abstract:

To ensure the water saving and operation safety of units at the same time, the optimal treatment scheme and operation condition of circulating cooling water were sought for. According to the characteristics of circulating cooling water taking soft water as supplement, the performance of four scale and corrosion inhibitors was studied by limit carbonate alkalinity method, weightloss method and dynamic simulated test. In the dynamic simulated test, “1/2Ca2++JDM”value which replaced the traditional ΔA value was used to adjust the sewage discharge in the circulating water system, and the corrosion of the concrete of cooling tower immersed in the circulating water with high SO42- content was observed. Being soaked in circulating water for 20days, the morphology of specimens remained unchanged, and the SO42- content of the solution was stable. The results show that QJ has excellent corrosion and scale inhibition performance, and is suitable for the circulating cooling water system taking soft water as supplement.It is feasible to prevent scaling in circulating water system by controlling “1/2Ca2++JDM” value, and SO42- shows no significant erosion on cement and aggregate in concrete when circulating water is of high cycle of concentration.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">soft water, circulating cooling water, water quality control, scale and corrosion inhibitors, sulfate, concrete.

牛犇. 以软化水为水源的循环冷却水水质控制技术[J]. 华电技术, 2020, 42(6): 16-21.

NIU Ben.

Water quality control technology for circulating cooling water taking soft water as source [J]. Huadian Technology, 2020, 42(6): 16-21.

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