汽轮机组给水系统的控氧与抑制流动加速腐蚀

Oxygen Control and Flow Accelerated Corrosion Suppression of Regenerative System in Steam Turbine Unit

动加速腐蚀现象普遍存在于火电机组和核电站中,对其安全经济运行危害极大。以有效抑制流动加速腐蚀为目的,从流动加速腐蚀的产生机理出发,总结了影响流动加速腐蚀速率的主要因素,讨论了抑制措施,着重对抑制措施中的加氧处理进行探讨。由于目前国内对给水加氧处理的加氧量选取存在不合理的情况,在论述给水加氧处理机理的基础上,分析了给水的最优加氧量,最终建立了有效抑制流动加速腐蚀的临界溶解氧浓度的数学模型。研究结果对火电机组和核电站选取最优加氧量具有重要的参考意义。

Flow accelerated corrosion （FAC） are commonly found in thermal power and nuclear power plants, which is of great harm for the safe and economic operation of thermal power and nuclear power plants. This paper started from the mechanism of FAC, summarized the influencing factors on the FAC rate, discussed measures for FAC suppression, and put emphasis on oxygen treatment. Based on the mechanism of Oxygen Treatment （OT）, this paper analyzed the best oxygen quantity of OT, and established the mathematical model for critical dissolved oxygen concentration to suppress FAC. The results of this paper is of great reference for the selection of the best oxygen quantity of Oxygen Treatment.