摘要
在某燃气 蒸汽联合循环机组长期停机备用期间,针对其余热锅炉尾部受热面开齿螺旋鳍片管锈蚀导致烟气流动阻力升高,影响燃气轮机带负荷的问题,通过现场数据监测、数值模拟及小型试验台试验,研究鳍片管表面锈蚀状态对流动阻力特性的影响。结果表明:余热锅炉尾部模块5、模块6的阻力上升明显;鳍片管背风侧的锈蚀堆积不会导致流动阻力的上升,两侧锈蚀厚度增加是流动阻力上升的主要原因;鳍片管除锈后鳍片减薄,流通截面积增大,阻力特性优于新鳍片管。
For a gas-steam combined cycle unit with long-term shutdown and standby, the flow resistance of flue gas was increased by the tarnishing of rear heating surface finned tube with outer helical fins in the waste heat boiler, which further leaded to the abnormal start-up of the gas turbine. Researches were conducted on the influence of the surface tarnishing status of finned tube on the flow resistance characteristics through on-site data monitoring, numerical simulation, and experiment in a small test bench. Results show that, the flow resistances of No.5 and No.6 models in the waste heat boiler rear flue increase significantly. The main reason of the increase of flow resistance is not the rust accumulation in leeward side of the finned tube, but the increase of rust thickness in both sides. After the rust removal, the flow resistance characteristics can be improved with the thinner fins and the enlarged cross-sectional area, and which are better than those of new finned tubes.
作者
张卫
俞哲锋
施子福
陶振涛
李宏梅
黄岳
闫凤平
周永刚
Zhang Wei;Yu Zhefeng;Shi Zifu;Tao Zhentao;Li Hongmei;Huang Yue;Yan Fengping;Zhou Yonggang(Zhejiang Zheneng Changshan Natural Gas Power Generation Co.,Ltd.,Changshan 324000,Zhejiang Province,China;Institute for Thermal Power Engineering of Zhejiang University(State Key Laboratory of Clean Energy Utilization),Hangzhou 310027,China)
出处
《发电设备》
2024年第3期138-143,156,共7页
Power Equipment
关键词
燃气蒸汽联合循环机组
余热锅炉
鳍片管
锈蚀
流动阻力
gas-steam combined cycle unit
waste heat boiler
finned tube
tarnishing
flow resistance
