矿井水在循环冷却系统中的结垢规律  

Scaling Law of Mine Water in Circulating Cooling System

作　　者：汪文 崔建国[1] 张峰[1] 李红艳[1] WANG Wen;CUI Jian-guo;ZHANG Feng;LI Hong-yan(College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学环境科学与工程学院,太原030024

出　　处：《科学技术与工程》2023年第19期8318-8324,共7页Science Technology and Engineering

基　　金：国家自然科学基金(21676178);国家自然科学基金青年科学基金(51408397);山西省自然科学基金(201701D121126)。

摘　　要：针对火力发电循环冷却水系统以矿井水为补充水引起的结垢问题,进行了结垢规律实验。以挂片沉积法模拟循环冷却水系统换热表面的结垢过程,采用重量法对所得的结垢产物进行分析,系统地考察了模拟矿井水中无机离子、温度、pH以及接触时间对结垢的影响,揭示了循环冷却水系统换热表面的结垢原理。实验结果表明:Ca^(2+)、HCO_(3)^(-)、Mg^(2+)、SO_(4)^(2-)的浓度增大对结垢量的增多有显著影响。同时,随着温度的上升、pH的提高、接触时间的增长,结垢量都有不同程度的增加。SO_(4)^(2-)浓度的增大会导致硬垢量增多。同时发现,SO_(4)^(2-)含量较低时,虽然Ca^(2+)、Mg^(2+)浓度增大,但生成的硬垢量也减少。SO_(4)^(2-)含量是形成硬垢的主要因素。该实验为进一步防止结垢,有针对性地进行水质处理奠定了基础。Experiments were conducted to investigate the scaling problem caused by the use of mine water as supplementary water in circulating cooling water systems for thermal power generation.The scaling process of the heat exchange surface of the circulating cooling water system was simulated by the hanging sheet deposition method,and the scaling products obtained were analysed by the weight method.The effects of inorganic ions,temperature,pH and contact time on the scaling of the simulated mine water were systematically investigated to reveal the scaling principle of the heat exchange surface of the circulating cooling water system.The experimental results show that increasing concentrations of Ca^(2+),HCO_(3)^(-),Mg^(2+)and SO_(4)^(2-)ions have a significant effect on the increase in the amount of scaling.At the same time,the amount of scaling increased to different degrees with increasing temperature,pH and contact time.the increase in SO_(4)^(2-)concentration led to an increase in the amount of hard scaling.It was also found that the amount of hard scale generated decreased at lower SO_(4)^(2-)levels,although Ca^(2+)and Mg^(2+)concentrations increased.SO_(4)^(2-)levels were the main factor in the formation of hard scale.This experiment lays the foundation for further prevention of scaling and targeted water treatment.

关 键 词：矿井水 循环冷却水 结垢 硬垢量 

分 类 号：TQ085[化学工程]