高温气冷堆二回路催化柠檬酸清洗可行性研究  

Feasibility analysis for chemical cleaning of the secondary circuit in high temperature gas-cooled reactors using catalytic citric acid

作　　者：刘锋[1] 刘永兵[1] 姚洪猛 孙雅萍[2] 姚建涛[1] 龙国军[1] 赵峰[2] LIU Feng;LIU Yongbing;YAO Hongmeng;SUN Yaping;YAO Jiantao;LONG Guojun;ZHAO Feng(Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710054, China;Huaneng Shandong Shidao Bay Nuclear Power Co., Ltd., Rongcheng 264312, China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]华能山东石岛湾核电有限公司,山东荣成264312

出　　处：《热力发电》2019年第6期79-83,共5页Thermal Power Generation

基　　金：中国华能集团公司总部科技项目(HNKJ17-23)~~

摘　　要：基于对高温气冷堆二回路化学清洗技术风险的分析,本文对高温气冷堆二回路柠檬酸清洗的可行性进行了研究。针对高温气冷堆二回路材质的多样性,进行了缓蚀剂体系的筛选;研究了Fe^3+存在对典型材质腐蚀影响,以及阀门密封面临近碳钢的电偶腐蚀情况。研究结果表明:复配型缓蚀剂可有效控制材料的腐蚀速率;低等级钢对Fe^3+较为敏感,实际清洗过程中应注意Fe3+的控制;阀门密封面临近碳钢的腐蚀速率满足《化学清洗缓蚀剂应用性能评价指标及试验方法》(DL/T 523—2017)要求。On the basis of analyzing technical risk of chemical cleaning of the secondary circuit in high temperature gas-cooled reactors using catalytic citric acid, the feasibility of the chemical cleaning of the secondary circuit in high temperature gas-cooled reactors using citric acid is researched. In view of various grades of steel used in the secondary circuit in high temperature gas-cooled reactors, the inhibitors system are selected. The influence of Fe^3+ on corrosion of typical materials is discussed, and the galvanic corrosion of carbon steel near the valve sealing surface is analyzed. The results indicate that, the compound inhibitors can effectively control the corrosion rates of typical materials. The low grade steels are sensitive to Fe^3+ in catalytic citric acid solution. The corrosion rate of carbon steel near the valve sealing surface could satisfy the requirement of Practice Evaluation and Testing Method of Inhibitors for Chemical Cleaning (DL/T 523 2017).

关 键 词：高温气冷堆 腐蚀 柠檬酸 清洗 电偶腐蚀 缓蚀剂 可行性 

分 类 号：TK284[动力工程及工程热物理—动力机械及工程]