电厂机组流动加速腐蚀研究进展及防护措施

Research Progress on Flow-accelerated Corrosion of Power Plant and Contermeasures

流动加速腐蚀(FAC)已成为电厂机组第二大失效方式,严重影响机组的安全运行。本文从FAC的机理出发,对影响FAC速率的流体动力学、环境和材料三方面因素分别进行论述,分析了造成流动加速腐蚀的内在原因,通过合理的管道设计、材料选择和水化学控制可以有效地提高管道抵抗FAC的能力,减小电厂发生FAC造成管道泄漏的可能性,提高电厂的安全性和可靠性,对火电机组和核电站避免流动加速腐蚀具有指导意义。

Flow-accelerated corrosion（FAC） has become the second largest failure mode for power plant facilities, which seriously affects the safe operation of the power unit. Therefore, the effect of environmental-and material-factors on the FAC rate is discussed in terms of the relevant FAC mechanism and the hydrodynamics in this paper. It follows that after correct diagnose for the cause of FAC, to enhance the resistance to FAC of the pipeline effectively through reasonable design, proper material selection and appropriate chemical control of water, as well as to reduce the possibility of pipe leakage caused by FAC should be beneficial to the safe-and reliable-operation of power plant, which is of great significance to refrain power plants from the harm of flow-accelerated corrosion.