燃气轮机发电机组备用中余热锅炉省煤器鳍片管防腐研究  

Study on anticorrosion of waste heat boiler economizer fin tube of gas turbine generator unit in standby state

作　　者：俞哲锋 陶振涛 许茂贤 闫凤平 周永刚[2] 黄岳 赵虹[2] YU Zhefeng;TAO Zhentao;XU Maoxian;YAN Fengping;ZHOU Yonggang;HUANG Yue;ZHAO Hong(Zhejiang Zheneng Changshan Natural Gas Power Generation Co.,Ltd.,Changshan 324000,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江浙能常山天然气发电有限公司,浙江常山324000 [2]浙江大学热能工程研究所(能源清洁利用国家重点实验室),浙江杭州310027

出　　处：《热力发电》2023年第11期186-192,共7页Thermal Power Generation

基　　金：浙江省能源集团有限公司科学技术项目(ZNJK-2021-030)。

摘　　要：针对燃气轮机发电机组频繁长期停机备用期间,余热锅炉省煤器鳍片管08Al碳钢表面腐蚀严重的问题,通过挂片法和电阻探针法,研究08Al碳钢在临界湿度以上环境下的宏观腐蚀现象及腐蚀速率。结果表明:在恒定的20℃及相对湿度70%环境下,08Al碳钢在前5天的腐蚀速率最快,腐蚀深度达到了0.85μm,占整个过程总变化量的47.7%;腐蚀现象变化最为明显的过程,包括质量及表面腐蚀面积比例的变化,发生在约第19~25天;随着相对湿度从临界湿度70%逐渐增加(环境温度20℃),08Al碳钢的各项腐蚀评价指标均呈线性上升趋势。根据研究结果制定的燃气轮机发电机组长期停机备用下的充氮保养策略,可有效缓解余热锅炉省煤器鳍片管的腐蚀状况。During frequent long-term standby state of gas turbine generator unit,the surface of 08Al carbon steel of waste heat boiler economizer fin tube will have serious corrosion problems.In this paper,the macroscopic corrosion phenomenon and corrosion rate of 08Al carbon steel above the critical humidity were studied by the method of hanging piece and electrical resistance probe.The results show that the corrosion rate of 08Al carbon steel is the fastest in the first 5 days under the constant environment of 20℃and relative humidity of 70%,and the corrosion depth reaches up to 0.85μm,accounting for 47.7%of the total change in the whole process.However,the most obvious corrosion phenomenon,including the change of weight and the surface corrosion area,occurred from about the 19th to the 25th day.With the relative humidity gradually increasing from the critical humidity of 70%(ambient temperature 20℃),the corrosion evaluation indexes of 08Al carbon steel show a linear upward trend.Nitrogen filling maintenance strategy under long-term standby state was formulated,effectively alleviating the corrosion condition of economizer fin tube of waste heat boiler.

关 键 词：燃气轮机发电机组 鳍片管 08Al碳钢 腐蚀过程 防腐策略 

分 类 号：TM611.24[电气工程—电力系统及自动化]