给水加氧处理方法的临界氧浓度研究

Critical Oxygen Concentration of Feedwater Oxygenated Treatment

为了确定机组给水加氧处理(OT)方式的最佳加氧浓度,应用临界氧浓度计算方法,并将得到的计算值与实际加氧工况结合进行讨论。结果显示:不同pH下,随着温度增加,临界氧浓度曲线均先增大后减小,且均在150℃时达到最大值,临界氧浓度与pH成反比;实际电厂中的加氧浓度应控制在60μg/kg左右能够抑制流动加速腐蚀(FAC),同时防止过量溶解氧造成高温受热面的高温腐蚀和应力腐蚀。

In order to determine the optimal oxygenated concentration under feedwater oxygenated treatment(OT),the calculation method of critical oxygen concentration was applied,the calculated values were discussed with actual oxygenation conditions.The critical oxygen concentration curves under different pH show that with the increase of temperature,there is similar tendency for the critical oxygen concentration curves,they are first increased and then decreased.They reach the maximum value at 150℃and are inversely proportional to pH.The concentration of oxygen in actual power plant should be controlled at about 60μg/kg,which can inhibit flow accelerated corrosion(FAC)and prevent excessive dissolved oxygen from causing high temperature corrosion and stress corrosion on HT heating surface.