高温气冷堆一回路管道内石墨粉尘沉积模型分析

Development of Modeling Deposition of Graphite Particles in High Temperature Gas-cooled Reactor

针对高温气冷堆自身运行的特点,研究了一回路中石墨粉尘-氦气气溶胶的物理特性以及沉积表面的几何特性,通过对影响石墨粉尘沉积行为主要因素进行分析,揭示高温气冷堆石墨粉尘在一回路管道表面沉积机理.研究结果表明,高温气冷堆一回路石墨沉积以紊流沉积和热泳沉积为主,由于高温气冷堆一回路管道布置包含了水平管道、垂直管道以及弯曲管道,重力和离心力对石墨粉尘在不同沉积表面上的沉积有很大影响.在上述分析的基础上,采用考虑包含沉积主要影响因素的计算颗粒沉积速度的半经验公式模型来研究高温气冷堆石墨粉尘在一回路管道表面的沉积.计算沉积速度的半经验公式模型可用于工程上预测高温气冷堆一回路不同管道表面沉积.

In the case of the cycle of spherical fuel element,it is inevitable that the wear of graphite components takes place and the graphite dust is generated in the core of high temperature gas-cooled reactor.The deposition of dust over the primary circuit boundary surface increases remobilization of fission product.The objective of this work is to advance a code for calculating the distribution of deposited graphite particles in the primary circuit of the reactor.Based on the analysis of major factors that impact graphite dust deposition behavior,the main deposition mechanism of graphite dust in high temperature gas cooled reactor is revealed.The study is focused on development of models for predicting the deposition rates of aerosols.The results show that the deposition model can be used to predict the deposition rate of graphite dust in the primary circuit of a high temperature gas-cooled reactor.