600 MW超临界燃煤锅炉尾部受热面磨损模拟研究  

Simulation study on tail heating surface wear of 600 MW supercritical coalfired boiler

作　　者：杨帮敏 杨威 柯永省 吴剑波 陈双照 张海丹 张光学[3] YANG Bangmin;YANG Wei;KE Yongsheng;WU Jianbo;CHEN Shuangzhao;ZHANG Haidan;ZHANG Guangxue(Zhejiang Zheneng Yueqing Power Generation Co.,Ltd.,Wenzhou 325609,Zhejiang China;Zhejiang Energy Group R&D,Hangzhou 311121,Zhejiang China;College of Energy Environment and Safety Engineering,China Jiliang University,Hangzhou 310018,Zhejiang China)

机构地区：[1]浙江浙能乐清发电有限责任公司,浙江温州325609 [2]浙江浙能技术研究院有限公司,浙江杭州311121 [3]中国计量大学能源环境与安全工程学院,浙江杭州310018

出　　处：《电力科技与环保》2025年第2期270-280,共11页Electric Power Technology and Environmental Protection

基　　金：国家重点研发计划项目(2022YFB4100302)。

摘　　要：【目的】为精确模拟燃煤锅炉尾部低温再热器和省煤器的受热面磨损情况,延长锅炉寿命,提高锅炉的安全运行水平,【方法】本文以某600 MW超临界燃煤锅炉为研究对象,提出一种锅炉本体热态燃烧模拟与尾部受热面磨损模拟进行单向耦合,前者作为后者的计算边界条件,旨在模拟锅炉尾部受热面磨损情况的新型数值计算方法。【结果】研究表明,低温再热器的平均磨损率为3.05×10^(-8) kg/(m^(2)·s),然而局部最大磨损率为1.54×10^(-6) kg/(m^(2)·s);省煤器的磨损率更高,平均值可达6.65×10^(-8) kg/(m^(2)·s),局部最大磨损率为3.93×10^(-6) kg/(m^(2)·s);低温再热器和省煤器的第一排的迎风面磨损较为严重,且分布均匀,第2~4排换热管的磨损最轻微,第5排之后换热管侧面产生了点状分布的不规律磨损现象,局部磨损率超过了第1排,以切削磨损为主。当锅炉负荷增加时,烟气速度增加,受热面的磨损率呈现指数增大趋势。当负荷降低至50%时,磨损率仅为满负荷时的1/10左右。当煤质灰分含量由10%提高至20%时,磨损率呈线性增加趋势,但灰含量进一步增加时,磨损率增加的速度变缓。煤粉颗粒越粗,燃烧产生的飞灰粒径越大,对管壁的冲击磨损越大。【结论】建议对锅炉尾部受热面第一排换热管进行重点防护。当煤质灰份含量较高时,应避免锅炉长期高负荷运行,并适当提高煤粉细度。[Objective]In order to accurately simulate the wear of the heating surface of the low-temperature reheater and the economizer at the tail of the coal-fired boiler,prolong the life of the boiler,improve the level of safe operation of the boiler,[Methods]in this paper,a supercritical boiler of a 600 MW unit is taken as the research object,and a one-way coupling of the thermal combustion simulation of the boiler body and the wear simulation of the tail heating surface is proposed.The former is used as the calculation boundary condition of the latter,aiming to simulate a new numerical calculation method for the wear of the heating surface at the tail of the boiler.[Results]The results showed that the average wear rate of the low-temperature reheater was 3.05×10^(-8) kg/(m^(2)·s),while the local maximum wear rate was 1.54×10^(-6) kg/(m^(2)·s).The wear rate of the economizer is higher,with an average value of 6.65×10^(-8) kg/(m^(2)·s)and a local maximum wear rate of 3.93×10^(-6) kg/(m^(2)·s).The windward surface wear of the first row of low temperature reheater and economizer is more serious and evenly distributed.The wear of the second to fourth rows of tubes is the slightest.After the fifth row,the irregular wear of the side of the tube is distributed in a point shape,and the local wear rate exceeds the first row,mainly cutting wear.When the boiler load increases,the flue gas velocity increases,and the wear rate of the heating surface increases exponentially.When the load is reduced to 50%,the wear rate is only about 1/10 of that at full load.When the ash content of coal increases from 10%to 20%,the wear rate increases linearly,but when the ash content further increases,the rate of increase in wear rate slows down.The thicker the pulverized coal particles,the larger the particle size of fly ash produced by combustion,and the greater the impact wear on the pipe wall.[Conclusion]It is recommended to focus on the protection of the first row of heat exchange tubes on the heating surface of the boiler tail.When th

关 键 词：磨损 数值模拟 超临界锅炉 尾部受热面 计算流体力学 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]