核反应堆严重事故中气溶胶的吸湿增长研究进展

A Review of Research on Aerosol Hygroscopic Growth in Severe Nuclear Reactor Accidents

可溶性气溶胶(以下简称气溶胶)的吸湿增长是影响核反应堆严重事故中放射性产物动力学行为的关键因素之一,本文对吸湿增长的理论模型、实验测量方法以及核安全领域吸湿增长的研究进展进行了总结。核安全领域气溶胶吸湿增长理论模型以K?hler理论为基础,描述了吸湿增长过程中气溶胶热物性等参数与环境参数的关系,在此基础上发展的多种改进模型更适用于实际问题的分析,已在NAUA-HYGROS、MELCOR等核安全气溶胶计算程序中得到广泛应用。实验测量也是研究气溶胶吸湿增长特性的重要手段,相比于可测量气溶胶整体吸湿能力但结果较为粗糙的重量法,电力平衡法、HTDMA法精度较高,且具备实时测量单个颗粒及多模态颗粒群的吸湿能力,在核事故气溶胶吸湿增长特性实验研究方面具有潜在应用前景。本文最后总结了严重核事故领域吸湿增长的现有应用研究,包括核事故典型气溶胶吸湿增长特性的理论模型与数值计算应用研究、吸湿增长实验研究,数值计算研究表明,将气溶胶吸湿增长特性纳入到核事故气溶胶计算程序中可以实现对核事故发生后气溶胶行为更为准确的预测分析,相关实验得到了CsOH、CsI等典型核事故气溶胶的吸湿增长特性。

The hygroscopic growth of soluble aerosols(hereinafter referred to as aerosols)is one of the key factors affecting the dynamic behavior of radioactive products in serious nuclear reactor accidents.In this paper,the theoretical model of hygroscopic growth,experimental measurement scheme and research progress of hygroscopic growth in nuclear safety field are summarized.Based on Köhler theory,aerosol hygroscopic growth theoretical model in the field of nuclear safety describes the relationship between aerosol thermophysical parameters and environmental parameters in the process of hygroscopic growth.On this basis,a variety of improved models are more suitable for the analysis of practical problems,and have been widely used in nuclear safety aerosol calculation programs such as NAUA-HYGROS and MELCOR.Experimental measurement is also an important means to study the hygroscopic growth characteristics of aerosols.Compared with the gravimetric method,which can measure the overall hygroscopic ability of aerosols,but the results are relatively rough,the power balance method and the HTDMA method have higher accuracy,and can measure the hygroscopic ability of single particles and multimodal particle groups in real time,and have potential application prospects in the experimental study of the aerosol hygroscopic growth characteristics of nuclear accidents.At the end of this paper,the existing applied researches on hygroscopic growth in the field of serious nuclear accidents are summarized,including the theoretical model and numerical application of typical aerosol hygroscopic growth in nuclear accidents,and the experimental study of hygroscopic growth.Numerical studies show that incorporating aerosol hygroscopic growth characteristics into the aerosol calculation program of nuclear accident can achieve more accurate prediction and analysis of aerosol behavior after nuclear accident.The hygroscopic growth characteristics of CsOH,CSI and other typical nuclear accident aerosols were obtained by relevant experiments.