ABSTRACT

An experimental study on the antifouling performance of ultrasonic and/or electronic treatment was carried out in a convective heat transfer process by using a fouling monitor system. An ultrasonic device was used in a frequency of 28 kHz and a power of 80 W, and a low-voltage electronic processor also used with a maximum current of 0.8 A for water treatment. The experimental results showed that both of the ultrasonic and the electronic treatment, all displayed good scale-inhibition effects for hard water in convective heat transfer, and further the compound treatment of them gave much better antifouling performance at the same conditions. The fouling inhibition efficiency got up to a maximum of 100% by the treatments. The technical treatment may change not only the amount of deposition on heat transfer surface, but also the morphology of crystals formed in microscale. The fouling crystal displayed a clear type of aragonite of calcium carbonate but varied obviously with the treatments. It can be sure that the technical treatments are effective and applicable in real heat transfer application with hard water as a working fluid.

摘要

使用污垢监测系统在对流传热过程中对超声波和/或电子处理的防污性能进行了实验研究。使用频率为28 kHz，功率为80 W的超声波装置，还使用最大电流为0.8 A的低压电子处理器进行水处理。实验结果表明，超声波处理和电子处理均对硬水在对流换热中表现出良好的阻垢效果，并且在相同条件下进一步复合处理具有更好的防污性能。处理后的污垢抑制效率最高可达100%。技术处理不仅可以改变传热表面的沉积量，以及在微观尺度上形成的晶体的形态。污垢晶体显示出清晰的碳酸钙文石类型，但随着处理的不同而变化明显。可以肯定，这些技术处理是有效的，适用于以硬水为工质的实际换热应用。