低压静电用于循环冷却水阻垢的实验研究  

Experimental Study of Circulating Cooling Water Scale Inhibition by Low Voltage Electrostatic

作　　者：全贞花[1] 王春明[1] 李兵[1] 陈永昌[1] 马重芳[1] 

机构地区：[1]北京工业大学环境与能源工程学院传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室,北京100022

出　　处：《净水技术》2007年第6期30-33,69,共5页Water Purification Technology

基　　金：国家重点基础研究发展规划项目(973项目;No.G2000026304);教育部留学回国人员科研启动基金(No.00084)

摘　　要：对低压静电处理循环冷却水的阻垢性能进行了实验研究与机理分析。采用动态监测污垢热阻的方法进行了结垢与阻垢实验,并对溶液的水质进行了分析。结果表明,低压静电处理循环冷却水对换热表面的结垢起到很好的抑制作用,实验中仅需2.2W功率就可达到100%的阻垢率。低压静电水处理不同与其它物理水处理技术,它可降低溶液的硬度、碱度、电导率及pH值,是一种主动的抗垢技术。被处理溶液中发生的微电解反应使更多的污垢晶体在处理器中聚集并生长,而不是沉积在换热表面,从而起到阻垢作用。The scale inhibition performance of low voltage electrostatic in the circulating cooling water system was investigated and its mechanism was identified. A series of fouling tests were carried out by dynamically monitoring fouling resistance and the water qualities were analyzed. It was shown that the fouling was effectively restrained to form on the surface of the heat exchanger if the circulating cooling water was treated with low voltage static electricity. When the power was about 2.2W, the scale inhibition reached 100%. The hardness, alkalinity, electrical conductivity, and pH of the solution were decreased with the treatment. The low voltage electrostatic water treatment is an inactive scale inhibition technology, which is different from the other physical water treatment technologies. The mechanism of scale inhibition is that the micro electrolysis reactions occur nearby the electrode due to the low current existing in the water, so most fouling forms in the solution nearby the cathode or on the inner surface of treatment unit, but not depositing on the surface of the heat exchanger. In addition, the electrostatic field contributes to inhibition enhancement.

关 键 词：低压静电处理 循环冷却水 阻垢 污垢热阻 

分 类 号：TQ085.4[化学工程] X703[环境科学与工程—环境工程]