蒸汽发生器沉积物在EDTA溶液中溶解行为  

Dissolution Behavior of Steam Generator Deposit in EDTA Solution

作　　者：宋利君[1,2] 肖艳 孙云 田朝晖[1,2] 刘灿帅 邹伟 Song Lijun;Xiao Yan;Sun Yun;Tian Zhaohui;Liu Canshuai;Zou Wei(Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou,Jiangsu,215004,China;National Engineering Research Center for Nuclear Power Plant Safety&Reliability,Suzhou,Jiangsu,215004,China)

机构地区：[1]苏州热工研究院有限公司,江苏苏州215004 [2]国家核电厂安全及可靠性工程技术研究中心,江苏苏州215004

出　　处：《核动力工程》2024年第4期228-234,共7页Nuclear Power Engineering

摘　　要：为了研究化学清洗剂乙二胺四乙酸(EDTA)对模拟沉积物Fe_(3)O_(4)和蒸汽发生器(SG)泥渣的溶解能力,以指导化学清洗工艺选择,采用X射线荧光光谱和电感耦合等离子体发射光谱分析温度、EDTA浓度、溶解时间对模拟沉积物Fe_(3)O_(4)和SG泥渣的溶解效果。采用Fe_(3)O_(4)制备化学修饰电极,采用三电极体系开展修饰电极的循环伏安测试和交流阻抗测试。结果表明,溶液温度越高,EDTA浓度越高,对Fe_(3)O_(4)的溶解能力越强;溶解时间越长,模拟沉积物Fe_(3)O_(4)和SG泥渣的溶解率越高;由于SG泥渣和模拟沉积物Fe_(3)O_(4)的差异性,EDTA溶液对SG泥渣的溶解能力弱于模拟沉积物Fe_(3)O_(4);修饰电极在EDTA溶液中的电化学反应过程属于扩散控制过程。In order to explore the solubility of chemical cleaning agent EDTA on simulated deposit Fe_(3)O_(4)and steam generator sludge,and to guide the selection of chemical cleaning processes,XRF and ICP-OES were used to analyze the dissolution effects of solution temperature,EDTA concentration,and dissolution time on simulated deposit Fe_(3)O_(4)and SG sludge.The chemically modified electrode was prepared by Fe_(3)O_(4),and the cyclic voltammetry test and AC impedance test of the modified electrode were carried out by using a three-electrode system.The results indicate that the higher the solution temperature,the higher the EDTA concentration,and the stronger the solubility of Fe_(3)O_(4).The longer the dissolution time,the higher the dissolution rate of Fe_(3)O_(4)and SG sludge.Due to the differences between SG sludge and Fe_(3)O_(4),EDTA solution has a weaker ability to dissolve SG sludge than Fe_(3)O_(4).The electrochemical reaction process of Fe_(3)O_(4)modified electrode in EDTA solution is diffusion-controlled process.

关 键 词：蒸汽发生器(SG) Fe_(3)O_(4) 泥渣 化学修饰电极 乙二胺四乙酸(EDTA) 

分 类 号：TL38[核科学技术—核技术及应用]