Analysis Model and Parameter Optimization of a Silica Removal System for Boric Acid in Nuclear Power Plant
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摘要: 为了提高核电厂含硼水溶硅去除装置(简称除硅装置)的性能,改进了分析模型,并分别对截留分子量(MWCO)为200 Da和250 Da的反渗透膜除硅分离实验进行了理论计算。模型计算结果与实验测量值符合良好,证明了该改进模型的准确性与适用性。在此基础上,进一步对除硅装置参数优化进行了研究,分析了相关参数对装置除硅性能的影响,研究结论对除硅装置的设计与运行具有参考意义。Abstract: In order to improve the performance of the silica removal system for boric acid in nuclear power plants, the modified analysis model is established. The simulation of silica removal experiments using 200 Da and 250 Da molecular weight cut off (MWCO) reverse osmosis membranes is carried out by using this model. The calculation results meet the experimental data well, which demonstrates the accuracy and the applicability of the modified model. Further study on parameters optimization of this silica removal system based on this model is implemented as well; the effect of relevant parameters on the performance is analyzed. The conclusion is with reference significance for system design and operation.
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Key words:
- Reverse osmosis membranes /
- Enriched boric acid /
- Silica removal system
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表 1 除硅装置参数及工况
Table 1. Parameters and Conditions of Experimental System
参数 MWCO 200 Da 250 Da BAST 容积/ L 500 500 初始硼浓度/ppm① 7537 8294 初始SiO2浓度/ppm 11.83 9.97 CHT 容积/ L 500 500 初始硼浓度/ppm 7507 8277 初始SiO2浓度/ ppm 11.25 10.71 透析液回流流量Fr/(L·min−1) 1.5 3.0 浓缩液循环流量/(L·min−1) 70 70 反渗透膜硼通过比 0.60 0.65 反渗透膜SiO2通过比 0.03 0.03 注:①1 ppm =10−6 表 2 装置分离效果
Table 2. System Separation Performance
参数 透析前 透析后 BAST 硼浓度/ ppm 7522 5886.8 SiO2浓度/ ppm 11.50 0.80 硼浓度/SiO2浓度 654.09 7404.8 CHT 硼浓度/ppm 7522 9811.3 SiO2浓度/ppm 11.50 26.49 硼浓度/SiO2浓度 654.09 370.38 -
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