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

doi:10.11930/j.issn.1004-9649.201810041

Abstract

Abstract: 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 CHEMWORKS. 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, 2×10^-6≤w_ETA≤4×10^-6, 0.5×10^-6≤w_NH₃≤1×10^-6.

Key words: nuclear power plant, secondary circuit, water chemistry condition, ETA, ammonia, combined application of alkalinity, concentration ratio of alkalinity

CLC Number:

TM623.7

ZHAO Yongfu, JIANG E, GONG Bin, WEN Juhua, TANG Min, YIN Zhaohui, HE Yanchun. Feasibility Study on Combined Application of Ethanolamine and Ammonia in the Secondary Circuit of Nuclear Power Plant[J]. Electric Power, 2019, 52(4): 127-132.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201810041

https://www.electricpower.com.cn/EN/Y2019/V52/I4/127

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