During the process of containment depressurization venting, a high-temperature and high-pressure carrier gas with aerosol may be released into the spent fuel pool by a multi-hole injector. This aerosol in the carrier gas can be removed by pool scrubbing. A small-scale pool scrubbing facility was built to study the aerosol pool scrubbing phenomenon using a multi-hole injector. In this study, a gaseous mixture of nitrogen and steam is used to simulate carrier gas, and insoluble solid particles of TiO2 are used to simulate aerosols in the carrier gas. Seven tests were performed to examine the dependence of the decontamination factor (DF) on the pool depth, particle diameter, and steam mass fraction. The results show that log(1 / (1 - Xm)) has a linear relationship with log(DF). DF varies exponentially with pool depth, which has a influence on the retention of aerosols with a larger particle diameter. Particle diameters in the range of 0.2–0.52 μm have little effect on the DF. For low depth pool scrubbing, the steam condensation mechanism is dominant, and the particle diameter does not have a significant effect on the DF. Moreover, the pool scrubbing model is discussed, and an empirical correlation is proposed to evaluate the DF of a pool.

中文翻译：

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池洗涤气溶胶滞留影响因素的实验研究

在安全壳降压放空过程中，可能会通过多孔喷射器将带有气溶胶的高温高压载气释放到乏燃料池中。载气中的这种气溶胶可以通过池洗涤去除。建造了一个小型池洗涤设施，以研究使用多孔喷射器的气溶胶池洗涤现象。在这项研究中，氮气和蒸汽的气体混合物被用来模拟载气，二氧化钛的不溶性固体颗粒被用来模拟载气中的气溶胶。进行了七项测试以检查去污因子 (DF) 对池深度、颗粒直径和蒸汽质量分数的依赖性。结果表明 log(1 / (1 - Xm)) 与 log(DF) 具有线性关系。DF 随池深度呈指数变化，这对较大粒径的气溶胶的截留有影响。0.2-0.52 μm 范围内的粒径对 DF 几乎没有影响。对于低深度池洗涤，蒸汽冷凝机制占主导地位，颗粒直径对 DF 没有显着影响。此外，还讨论了池清洗模型，并提出了经验相关性来评估池的 DF。