超临界锅炉脱落氧化物在线监测系统研发与应用

Development and Application of On-line Monitoring System for Falling-off Oxides of Supercritical Boilers

为实现超临界锅炉脱落氧化物全寿命周期监测,研发了脱落氧化物实时在线监测系统。监测系统在过热器、再热器出口安装测量探头,利用撞击振动波测量技术,可以在线、实时、连续、直接测量脱落氧化物颗粒质量、粒度分布和颗粒流量,有效监测脱落氧化物在蒸汽管道中的流动规律。系统应用在超临界发电机组,通过分析主、再蒸汽管道内颗粒特征数据,以及固体颗粒流量随时间、负荷的变化趋势,监测氧化物脱落严重程度,评估运行控制情况,实现减少脱落氧化物和预防固体颗粒侵蚀的目的。同时利用系统实现机组启、停及运行期间蒸汽品质监测,研究铁在机组汽水循环过程中流动规律。

In order to realize the life cycle monitoring of exfoliated oxide,a real-time on-line monitoring system for exfoliated oxide of supercritical boilers was developed.The monitoring system installs measuring probes at the outlet of superheater and reheater.By using the impact vibration wave measurement technology,the mass content,particle size distribution and particle flow of exfoliated oxide particles can be directly measured online,real-time and continuously,and the flow of exfoliated oxide in steam pipeline can be effectively monitored.The system is applied in supercritical generating units.By analyzing particle characteristics data,and the variation trend of solid particle concentration with time and load in steam pipeline,the severity of oxide shedding is monitored,and the operation control is evaluated.The purpose of reducing oxide shedding and preventing solid particle erosion is realized.At the same time,the system is used to monitor the quality of steam impurities during the start-up and operation of the unit,and to study the flow of iron in the steam-water cycle of the unit.