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通过对核电站的硼酸回收系统中蒸发塔的分离效率进行理论分析,设计蒸发分离试验平台,对模拟料液进行蒸发试验,结果表明:回流比对蒸发效率影响较大,操作压力对蒸发效率影响并不显著。蒸发塔的回流比为20%和30%优于回流比为10%的蒸馏分离效果;蒸发塔在蒸汽流速超过额定流速25.9%的条件下,蒸馏液含硼浓度仍然小于5 mg/kg。放射性替代试验显示蒸发塔对不易挥发放射性核素的去污因子达到1 150。试验塔在保持与在役设备具有相同气相流速和液相流速的条件下,蒸馏液含硼浓度水平达到核电站的运行要求。
Through the theoretical analysis of the separation efficiency of the evaporation tower in the boric acid recovery system of nuclear power plant, the evaporation separation test platform is designed and the evaporation test of the simulated feed liquid is conducted. The results show that the reflux ratio has a great influence on the evaporation efficiency, and the influence of operating pressure on the evaporation efficiency Not obvious. Evaporation tower reflux ratio of 20% and 30% better than the reflux ratio of 10% of the distillation separation; distillation tower at a steam flow rate exceeds the rated flow rate of 25.9% under the conditions of the distillate boron concentration is still less than 5 mg / kg. Radioactive substitution tests showed that the decontamination factor of the evaporation tower for non-volatile radionuclides reached 1 150. The test tower maintains the boron-containing concentration of the distillate to meet the operational requirements of the nuclear power plant while maintaining the same gas-phase flow rate and liquid-phase flow rate as those in service.