核电站二回路乙醇胺与氨复合应用可行性研究

Feasibility Study on Combined Application of Ethanolamine and Ammonia in the Secondary Circuit of Nuclear Power Plant

为进一步优化核电站二回路水化学工况,降低二回路水化学运行成本,分析了核电站二回路采用单一碱化剂存在的问题,提出了乙醇胺和氨复合应用的对策和基本依据。采用Chemworks软件,计算乙醇胺和氨不同配比复合应用于典型核电站二回路系统时不同部位工质的碱化剂浓度及pH值,筛选出了最佳乙醇胺质量分数(wETA)和氨质量分数(wNH3)配比及其范围,并通过高压釜试验验证了理论计算结果。研究表明:当核电站二回路给水中WETA:WNH3≈4:1、2×10^-6≤WETA≤4×10^-6、0.5×10^-6≤1×10^-6时,应用效果较好。

The problems from the usage of single alkalinity treatment were analyzed and then the countermeasures and basic standards of combined application of ethanolamine (ETA) and ammonia in the secondary circuit of nuclear power plant (NPP) were put forward in order to further optimize water chemistry condition and reduce chemical operation cost. With various combination ratios of ethanolamine and ammonia, the alkalinity concentration and pH values at different parts of secondary circuit of a typical nuclear power plant were calculated by CHEM WORKS. The optimum concentration ratio and range of ethanolamine and ammonia were filtered and verified by theoretical calculation and autoclave tests. The results show that satisfactory outcome can be attained in practice when the concentrations of ethanolamine and ammonia in the feed-water of secondary circuit meet the following requirements: W eta:W nh3=4:1,2xl 6 $ weta$ 4 x1 6,.5xl 6.