压水堆核电厂二回路ETA水化学处理研究

Research of ETA Water Chemistry Treatment Technology in Secondary Circuit of PWR Plant

秦山核电厂320 MW核电机组使用乙醇胺(ETA)替换氨作为二回路系统p H调节剂后,在给水p H相同的条件下,汽-水分离再热器(MSR)疏水、蒸汽发生器(SG)排污水的p H明显升高;汽-水两相中水相区域设备的腐蚀产物铁含量明显降低,流动加速腐蚀得到抑制,有效改善二回路系统的腐蚀状况;腐蚀产物向蒸汽发生器二次侧的转移得以降低;同时进一步提高凝水混床的周期制水量,减少了凝水混床树脂的再生次数及再生酸、碱的用量和耗水量,从而减轻运行人员的工作负担和再生废液对环境的污染。

After using ETA as the pH adjustment agent in secondary Circuit of Qinshan 320 MWe PWR plant in place of ammonia, the pH of Moisture Separator Reheater（MSR） drainage and Stream Generator（SG） blowdown water are obviously increased, so that the corrosion conditions are improved, such as： the corrosion products of the equipment in the water phase decreased, flow accelerate corrosion is restrained and the transfer of corrosion products to the secondary side of the SG is reduced. As more period water output are produced from condensate mixed bed because of ETA applied in the secondary system, the regeneration times and acid, alkali and water consumption when regenerating resins are reduced, so the workload of operation workers can be alleviated and the environment pollution from the waste water are reduced either.