高频与感应式电子除垢仪除垢特性对比

通过搭建电子除垢仪除垢特性对比实验台,模拟蒸发冷设备实际运行工况,对高频与感应式电子除垢仪对蒸发冷设备喷淋系统电子除垢特性进行对比实验研究。结果表明:两种除垢仪均能增加水的活性,加速污垢的溶解、脱落,减少换热管外污垢热阻,但作用效果有差异。经过约150 h的实验,在高频电子除垢仪与感应式电子除垢仪作用下,污垢热阻最高降幅分别为17.81%、20.35%,但在感应式电子除垢仪作用下,污垢热阻减小阶段多次出现。扫描电镜分析发现,在高频电子除垢仪作用下,污垢晶体主要为针棒状结构;而在感应式电子除垢仪作用下,污垢晶体主要为大块散乱状结构。由独立实验可知,高频电子除垢仪与感应式电子除垢仪均能有效降低循环水的硬度,经过12 h的实验,循环水硬度降幅分别为40.35%和37.04%。

Comparison of Descaling Characteristics between High-frequency and Induction-type Electronic Descaling Devices

Under actual operating conditions, a closed cooling tower was simulated and the descaling characteristics of an induction-type electronic descaling device and a high-frequency electronic descaling device on the spray water side of an evaporative cooler was investigated experimentally. The results show that both kinds of electronic descaling instruments can accelerate the dissolution of dirt and reduce fouling resistance on the outside of the heat transfer tubes, but the effects are different. During the 150 h of the experiment, the greatest decline in the fouling resistance using the high-frequency and induction-type electronic descaling devices was 17.81% and 20.35%, respectively. With the induction-type electronic descaling device, the fouling resistance reduced several times. The results of scanning electron microscopy show that the structure of dirt crystals is rod-like under the action of the high-frequency electronic descaling device, but exhibits a block structure with the induction-type electronic descaling device. The results of independent experiments show that the two electronic descaling instruments can effectively reduce the hardness of circulating water. After a 12 h experiment, the circulating water hardness was observed to decrease by 40.35% and 37.04%, respectively.