超临界机组疏水系统发生流动加速腐蚀的影响因素以及预防

电厂汽水管道运行中流动加速腐蚀(FAC)现象普遍存在,危及电厂安全。随着机组参数的提高,针对超临界机组,通过模拟与现场实时数据分析得到疏水系统与给水系统一样存在较高的流动加速腐蚀现象。流体动力学、环境和材料因素是造成流动加速腐蚀的主要因素。由沧东电厂660 MW超临界机组的实时数据分析得到p H值、电导率、含氧量对其疏水系统发生流动加速腐蚀的影响关系,结合其采用的水处理方式,分析超临界机组疏水系统发生FAC的机理和原因,给出预防和抑制超临界机组疏水系统发生流动加速腐蚀的有效措施。

The Influence Factors and Prevention of Flow Accelerated Corrosion in Drainage System of Supercritical Units

In the operation of the power plant soda pipe,flow accelerated corrosion is widespread,which seriously affects the safe operation of the power plant.With the increase of unit parameters,according to real-time data analysis of simulation and real-time data for the supercritical units,there is a high flow accelerated corrosion phenomenon of the hydrophobic system and the water supply system.The main factors affecting the flow accelerated corrosion are fluid dynamic,environmental and material factor.The influence of pH value,conductivity and oxygen content on the flow accelerated corrosion in the hydrophobic system of Cangdong Power Plant was obtained by real-time data analysis of 660 MW supercritical unit and combined with its water treatment processes adopted,the formation mechanism and reason of FAC in supercritical units are analyzed and the effective measures to prevent the flow accelerated corrosion of supercritical hydrophobic system are given.