Peng Yaxuan, Xu Xuefei, Liang Yandong
School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin 132012, China.
School of Automation Engineering, Northeast Electric Power University, Jilin 132012, China.
Entropy (Basel). 2023 Jun 21;25(7):962. doi: 10.3390/e25070962.
In this study, the influence of an axial-electromagnetic field treatment device (AEFTD) with a solenoid structure using different electromagnetic frequencies on calcium carbonate (CaCO) crystallization fouling on the tube side of a shell-and-tube heat exchanger was investigated. The experimental results indicated that the application of the AEFTD could effectively reduce fouling resistance and decelerate the growth rate of CaCO fouling. The opposite trend between fouling resistance and the outlet temperature of an experimental fluid indicated that the application of the AEFTD could enhance heat transfer. Meanwhile, the crystal morphologies of the fouling samples were analyzed by means of scanning electron microscopy (SEM). The axial-electromagnetic field favored the formation of vaterite as opposed to calcite. Non-adhesive vaterite did not easily aggregate into clusters and was suspended in bulk to form muddy fouling that could be carried away by turbulent flow. Furthermore, the anti-fouling mechanism of the axial-electromagnetic field is discussed in detail. The anti-fouling effect of the AEFTD on CaCO fouling exhibited extreme characteristics in this study. Therefore, the effectiveness of the AEFTD is contingent upon the selection of the electromagnetic parameters.
在本研究中，对一种采用不同电磁频率的螺线管结构轴向电磁场处理装置（AEFTD）对壳管式换热器管程碳酸钙（CaCO₃）结晶污垢的影响进行了研究。实验结果表明，应用AEFTD可有效降低污垢热阻并减缓CaCO₃污垢的生长速率。污垢热阻与实验流体出口温度之间的相反趋势表明，应用AEFTD可强化传热。同时，通过扫描电子显微镜（SEM）对污垢样品的晶体形态进行了分析。轴向电磁场有利于球霰石而非方解石的形成。非粘性的球霰石不易聚集成团簇，而是悬浮在主体中形成泥状污垢，可被湍流带走。此外，还详细讨论了轴向电磁场的防垢机理。在本研究中，AEFTD对CaCO₃污垢的防垢效果表现出极值特性。因此，AEFTD的有效性取决于电磁参数的选择。
