超(超)临界锅炉给水疏水系统流动加速腐蚀特征和风险辨识

Discrimination of FAC features and threats in feed water and drainage systems of supercritical and ultra-supercritical units

结合水(汽)与炉管接触反应界面的氧化层(膜)的物质输送模型和流动加速腐蚀(FAC)研究理论,确定FAC是超(超)临界机组运行中暴露的众多共性化学问题的根本原因。通过对超(超)临界机组FAC特征的识别、预警和有效抑制,有助于提高超临界机组的安全经济运行水平。采用给水全挥发性处理的超(超)临界机组,要加强对FAC现象及特征的评估。

Combining with the matter transporting model of the water （steam）-metal and the theory of FAC （Flow Accelerated Corrosion）, FAC is determined as the ultimate causation for the numerous chemical problems in common of supercritical and ultra-supercritieal units. Clear discrimination, early warning and effectively restraining of FAC features of supercritical units could be utilized to substantially improve the operation quality. FAC situation assessment should be carried out in supercritical and uhra-supercritical units with AVT for feed water.