摘要
煤电机组深度调峰是提升电网灵活性、实现可再生能源消纳的重要措施。在机组快速降负荷过程中,静叶可调轴流风机极易出现失速。以680 MW机组静叶可调轴流风机为研究对象,阐述了风机的失速机理,并结合实际运行数据对风机低负荷的运行特性展开分析。结果表明:30%热耗率验证工况下,风机运行的工作点已基本处于失速线的边缘,稍有扰动即进入失速区,通过控制运行氧量则可一定程度改善。为彻底解决该问题,对变频改造、加装烟气再循环管道和动叶可调引风机改造三种方案的可行性进行论证。综合比较,推荐采取加装烟气再循环管道措施,该方案投资费用低,实施后效果明显,可基本消除引风机低负荷失速风险。
The deep peak shaving of coal⁃fired power plants is an important measure to improve electric grid flexibility and achieve the consumption of renewable energy.During the rapid load reduction of the unit,the adjustable stationary blade axial flow fan is extremely prone to stall.Taking a 680 MW unit as the research object,the staff mechanism of adjustable stationary blade axial flow fan was explained,and the low⁃load operation characteristics of the fan were analyzed based on actual operating data.The results show that on the 30%THA condition,the operating point of the fan is close to the edge of the stall line with a slight disturbance entering the stall zone,which can be improved to a certain extent by controlling the operating oxygen.In order to solve the problem absolutely,the feasibility of the three schemes including frequency conversion transformation,install flue gas recirculation transformation and the moving adjustable⁃blade transformation fan was demonstrated.Comprehensive comparison,it is recommended to install flue gas recirculation transformation which have the advantage of low investment and obvious results that can basically eliminate the risk of low⁃load stall of induced draft fans.
作者
谢富友
崔文利
陈清亮
任衍辉
李贵鹏
XIE Fuyou;CUI Wenli;CHEN Qingliang;REN Yanhui;LI Guipeng(Datang Huangdao Power Generation Co.,Ltd.,Qingdao 266500,China;Datang Northeast Electric Power Test&Research Institute Co.,Ltd.,Changchun 130000,China)
出处
《山东电力技术》
2022年第1期74-80,共7页
Shandong Electric Power
关键词
静叶可调
轴流风机
失速
烟气再循环
改造措施
adjustable stationary blade
axial fan
sall
flue gas recirculation
modification measures
