鼓泡过滤多分散气溶胶特性的矩估计分析

池式鼓泡过滤是核电站严重事故场景以及缓解措施中一种典型的放射性气溶胶滞留过程，评估气溶胶在该条件下的去除特性对事故后期的源项评估和制定相应的缓解措施具有重要意义。针对鼓泡过滤多分散气溶胶这一背景，本文假设气溶胶的尺度分布满足对数正态分布，考虑布朗扩散、重力沉降以及惯性碰撞3种机制对气溶胶在气泡内沉降的影响，利用矩方法得到了气溶胶尺度分布的3个分布参数（N、d_pg、σ_g）与其初始值、气泡上升高度以及沉降系数之间的解析关系。通过与精确解对比，对数正态矩方法推导的解析解表现出良好的预测精度。本文得到的解析解可在不需要气溶胶尺度分布具体信息而仅需要一些初始分布参数的情况下对气溶胶的去除特性进行快速评估。

Removal Characteristic of Polydisperse Aerosol under Bubble Scrubbing by Moment Method

Bubble scrubbing is a typical retention process for radioactive aerosol in severe accident scenarios and mitigation measures of nuclear power plants. It is indispensable to evaluate the removal characteristics of aerosol under bubble scrubbing condition, which plays a critical role for the evaluation of source term and the formulation of corresponding mitigation measures. For the background of polydisperse aerosol removed by bubble scrubbing, the particle size distribution was assumed to satify a log-normal distribution in this study. Brownian diffusion, gravity sedimentation and inertia impaction were chosen as the dominant removal mechanisms. The analytical correlations between the three distribution parameters of particle size distribution (N, d_pg, σ_g) and their initial values, bubble rise height and deposition coefficient were derived by moment method. Compared with the exact solution, the analytical solution shows good prediction accuracy. The analytical solution presented in this paper can be used to quickly evaluate the removal characteristics of aerosol without the detailed information of particle size distribution but only some initial distribution parameters.