摘要
通过分析污垢热阻、电导率和pH这3个参数的变化,并结合CaCO_(3)污垢扫描电镜图片,探究不同磁感应强度(0、100、200、300和400Gs)下交变磁场对换热壁面CaCO_(3)污垢的阻垢特性。实验结果表明:交变磁场通过对水溶液和CaCO_(3)的结晶过程产生影响,可以有效降低CaCO_(3)污垢在换热壁面的沉积速度,减小污垢热阻;交变磁场能够降低溶液的电导率和pH,促进CaCO_(3)的均相成核,增加溶液中的总沉淀量;交变磁场阻碍Ca CO_(3)晶型中文石向方解石的转变,促使文石的比例和尺寸增加。同时,交变磁场的阻垢特性存在极值特征,文中实验工况下,300Gs时交变磁场呈现最佳阻垢效果,阻垢率为78.2%。相比空白实验组,溶液的电导率和pH分别下降了7.5%和0.28;文石的比例和尺寸显著增加。
Fouling resistance, conductivity, pH and scanning electron microscope(SEM) photographs of CaCO_(3)fouling with different magnetic induction intensities(0, 100, 200, 300 and 400Gs) were analyzed to explore the fouling inhibition characteristics of alternating magnetic field. The experimental results indicate that the alternating magnetic field could effectively reduce the deposition rate of CaCO_(3)fouling on the heat transfer surface and fouling resistance by influencing the aqueous solution and crystallization process of CaCO_(3). The alternating magnetic field could reduce the solution conductivity and p H, promote the homogeneous nucleation of CaCO_(3), and increase the total amount of precipitation in the solution.Meanwhile, the alternating magnetic field prevents the transformation of CaCO_(3)crystal from aragonite to calcite,enlarging the proportion and size of aragonite. There is an extreme value for the fouling inhibition characteristics and the 300Gs presents the best fouling inhibition effect in this work, at which the fouling inhibition rate is 78.2%. And the solution conductivity and p H have decreased by 7.5% and 0.28,respectively, compared with the blank test. Moreover, the proportion and size of aragonite have increased significantly.
作者
梁延东
徐源
徐雪霏
王建国
LIANG Yandong;XU Yuan;XU Xuefei;WANG Jianguo(School of Automation Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第21期7913-7921,共9页
Proceedings of the CSEE
基金
国家自然科学基金项目(51176028)
吉林省重点科技攻关项目(20140204006SF)。
关键词
交变磁场
CaCO_(3)
污垢热阻
电导率
pH
扫描电镜
alternating magnetic field
CaCO_(3)
fouling resistance
conductivity
pH
scanning electron microscope(SEM)
