圆筒电极抑制换热表面CaCO_(3)污垢沉积特性研究  

Characteristics of CaCO_(3) fouling deposition on heat exchange surface under the action of cylinder electrode

作　　者：王兵兵 王超[1] 徐志明[1] WANG Bingbing;WANG Chao;XU Zhiming(College of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林省吉林市132012

出　　处：《化工学报》2022年第2期634-642,共9页CIESC Journal

基　　金：国家自然科学基金项目(51706038,51976028)。

摘　　要：将一圆筒柱面电极布置在换热器入口管道处,并与高压电源正极连接,研究圆筒电极形成的非匀强电场对实验段换热表面CaCO_(3)污垢沉积的影响。作为对比,同时分析了平行板电极(匀强电场)作用下CaCO_(3)污垢沉积行为。结果表明,施加平行电极与圆筒电极均可抑制换热表面CaCO_(3)污垢的沉积,抑垢率随施加电压(0~5000 V)的增加呈现先升高后降低的变化趋势。当施加平行电极时,最佳抑垢电压值为1000 V,最佳抑垢率为73.27%。当施加圆筒电极时,最佳抑垢电压为500 V,最佳抑垢率为83%。因此,施加圆筒电极具有更好的抑垢效果,同时最佳抑垢电压更低,可降低电的消耗。此外,在无电场作用时,换热表面CaCO_(3)晶体主要为树枝状文石结构,当施加圆筒或平行电极时,CaCO_(3)晶体主要为块状方解石结构。A cylindrical electrode is arranged at the inlet pipe of the heat exchanger and connected to the positive electrode of the high-voltage power supply to study the influence of the non-uniform electric field formed by the cylindrical electrode on the deposition of CaCO_(3) fouling on the heat exchange surface of the experimental section.In comparison,the CaCO_(3) scale deposition under the action of the parallel plate electrode(uniform electric field)was discussed.The results showed that applying parallel electrode and the cylinder electrode can inhibit CaCO_(3) scale on heat transfer surface deposition,scale inhibition rate increased with increase of voltage(0—5000 V)firstly and then decreased.When applying parallel electrodes,the best scale inhibition voltage value is 1000 V and the best scale inhibition rate is 73.27%.When the cylinder electrode is applied,the best scale inhibition voltage is 500 V and the best scale inhibition rate is 83%.Therefore,the cylinder electrode has better scale inhibition rate,and the best scale inhibition voltage is lower which can reduce the electricity consumption.In addition,SEM analysis shows that CaCO_(3) crystal is mainly dendritic aragonite structure at no electric field,while CaCO_(3) crystal is mainly calcite structure under the action of the electric field.

关 键 词：圆筒电极 CaCO_(3)污垢 最佳抑垢电压 CaCO_(3)晶体 传热传质 

分 类 号：TK124[动力工程及工程热物理—工程热物理]