摘要
锅炉水冷壁的膨胀状态影响火电机组的稳定和安全运行。基于在线监控数据对某超超临界机组锅炉的膨胀特性进行评价。基于最小二乘法对正常运行阶段锅炉测点膨胀位移数据进行拟合,通过膨胀位移波动率展现正常运行阶段中测点膨胀情况。结果表明,锅炉启动阶段、停炉阶段膨胀量均随时间急剧变化,而正常运行阶段膨胀监控值则围绕热态膨胀设计值波动。冷灰斗处测点Z轴方向位移平均拟合值较热态设计值减小24.73 mm,这可能源于锅炉水冷壁通过屈服或变形,吸收了部分膨胀。同一标高不同测点水平方向膨胀情况存在差异。5号测点Y轴位移波动率δ基本分布在±5%内,而6号测点仅有33.05%的监控膨胀值波动率分布在±5%内,这可能源于燃烧动力场分布不均匀。因此,水冷壁膨胀监控分析能够有效反映锅炉设备状态。
The expansion state of the boiler water-cooled wall affects the stable and safe operation of thermal power units.The expansion characteristics of the boiler of a supercritical unit based on online monitoring data was evaluated.Based on the least-squares method,the expansion displacement data of the boiler measurement points during the normal operation stage were fitted,and the expansion of the measurement points during the normal operation stage was shown by expansion displacement fluctuation rate.The results show that the boiler expansion during start-up and shutdown phases varies sharply with time,while the expansion monitoring value during normal operation fluctuates around the design value of thermal expansion.The average fitted value of Z-direction displacement at the cold ash hopper is 24.73 mm smaller than the thermal design value,which may be due to the boiler water-cooled wall absorbing part of the expansion through yielding or deformation.There are differences in the horizontal expansion of different measurement points at the same elevation.The fluctuation rateδof the Y-axis displacement at measurement point No.5 is basically distributed within±5%,while only 33.05%of the monitored expansion values at measurement point No.6 have a fluctuation rate within±5%,which may be due to the uneven distribution of the combustion power field.Therefore,the water-cooled wall expansion monitoring analysis can effectively reflect the boiler equipment status.
作者
张研
郭正旺
霍迎奥
肖海平
杨志平
ZHANG Yan;GUO Zhengwang;HUO Yingao;XIAO Haiping;YANG Zhiping(Guoneng Jinjie Energy Co.,Ltd.,Yulin 719319,China;Energy Power and Mechanical Engineering Department,North China Electric Power University,Beijing 102206,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S02期469-474,共6页
Clean Coal Technology
基金
国家重点研发计划资助项目(2022YFB4100803)
关键词
水冷壁
膨胀
波动率
稳定性评价
water-cooled wall
expansion
fluctuation rate
stability evaluation
