核电站300MW机组发电机内冷水水质优化

Optimization of Generator Inner Coolant in 300MW Unit Nuclear Power Plant

秦一厂300 MW发电机为双水内冷发电机组,系统自运行以来,定子和转子冷却水pH值一直偏低,铜含量偏高,无法满足电力行业标准的要求,随着运行时间的增加,发电机空芯导线存在腐蚀产物沉积的现象,影响设备安全运行。通过本次对发电机内冷水系统的技术改造,即采用智能净化水处理法,提高了发电机内冷水的pH值,发电机内冷水的铜含量明显降低,从而减缓定、转子线棒的腐蚀,并为防止空芯导线内表面腐蚀产物的沉积、堵塞营造了良好的水化学环境。该方法在运行过程中将发电机内冷水系统与凝结水系统相连接,使得定、转子水箱排水通过凝结水精处理系统净化后,得以复用,降低了水耗,且发电机内冷水系统也不再添加缓蚀剂,从而避免缓蚀剂在系统内沉积的可能性,由于智能处理装置在日常运行期间无需人工干预,平时只需要巡检,可大大减轻运行人员及水质分析人员的工作负担。

Double water inner cooled generator set were used in 300 MW generator of Qinshan-1 unit. With low pH value and high Cu content since the system operation, the coolant water quality in the stator and rotor can- not meet the electrical power industry standard. Furthermore, the generator hollow copper conductors were jammed by the corrosion products, which influenced the safe operation of the equipment. The method of intelligent water purification treatment adopted in this technical transformation of the generator inner cooling system made the pH of the water fed into the generator inner cooling system increase. The corrosion of the stator and rotor line rod would be restrained and Cu content in generator inner coolant obviously declined in the water with high pH value. It constructed a good water environment to prevent the corrosion products from depositing and jamming on the inner surface of the hollow copper conductors generator equipment operation. In this method, the generator system was connected to the condensate system, so the drainage from the water tank of the stator and rotor could be treated by the condensate refined treatment equipment, and then it could be recycled. Besides, there is no need of anti-corrosion reagent injected into the system, and then the deposition of the anticorrosion reagent in the system could be avoided. Apart from the daily tour-inspection, no manual control is needed in the daily operation and burden of operation personnel and analyzer could be mitigated.