直接空冷凝汽器流动加速腐蚀的影响因素  

Factors influencing flow accelerated corrosion in air cooling condensers

作　　者：孟龙[1] 杨静[2] 孙本达[1] 张祥金[1] 祁东东[1] 倪瑞涛[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]中国电力科学研究院,北京102401

出　　处：《热力发电》2014年第12期118-122,共5页Thermal Power Generation

基　　金：华能集团重点科技项目直接空冷凝汽器腐蚀控制关键技术的研究(HNKJ12-H28)

摘　　要：采用正交试验方法研究了空冷岛运行状态下温度、溶解氧含量、pH值、碱化剂种类和流速对碳钢部件流动加速腐蚀(FAC)的影响。结果表明:温度对空冷岛FAC的影响最大,溶解氧量次之,流速影响较小;碱化剂的使用与pH值相关,其联合作用不可忽视;水中溶解氧含量较低时,由于会影响金属表面Fe2O3保护膜的形成,使得金属易产生FAC,此时,提高水中溶解氧量可有效抑制FAC。By using the orthogonal test method,effects of dissolved oxygen content,pH value,different types of alkaline agent,and flow velocity on carbon steel flow accelerated corrosion （FAC）were discussed, under air cooling island working condition.Studies show that temperature has the largest influence on air cooling island FAC,dissolved oxygen takes the second place,and then is the velocity.The utilization of al-kaline agent is associated with the solution＇s pH value,the interaction between the two can not be neglec-ted.When the dissolved oxygen in water is low,the formation of Fe2 O3 protective film is affected,metals are prone to FAC.By this time,improving dissolved oxygen in water is the effective way to control FAC.

关 键 词：直接空冷 凝汽器 流动加速腐蚀 溶解氧 PH 值 流速 温度 

分 类 号：TM621.8[电气工程—电力系统及自动化]