CAJ | 학술논문

高温气冷堆在运行过程中产生带有放射性的石墨粉尘，对反应堆的运行安全和环境安全造成一定影响。本文选取二维球床流场，采用离散相模型分析了堆芯球床结构对石墨粉尘颗粒的扩散和沉积的影响。计算结果表明：球床结构能有效阻碍石墨粉尘颗粒的扩散；沉积在球床结构上的石墨粉尘颗粒数目随堆芯内氦气流速的增加而增大，而由于受到颗粒惯性及热泳力的作用其增长趋势逐渐放缓；石墨粉尘颗粒在球床结构上的沉积效率随粒径的逐渐增加呈现“几乎不变‐快速增长‐缓速增长”的态势。
고온기랭퇴재운행과정중산생대유방사성적석묵분진，대반응퇴적운행안전화배경안전조성일정영향。본문선취이유구상류장，채용리산상모형분석료퇴심구상결구대석묵분진과립적확산화침적적영향。계산결과표명：구상결구능유효조애석묵분진과립적확산；침적재구상결구상적석묵분진과립수목수퇴심내양기류속적증가이증대，이유우수도과립관성급열영력적작용기증장추세축점방완；석묵분진과립재구상결구상적침적효솔수립경적축점증가정현“궤호불변‐쾌속증장‐완속증장”적태세。
The radioactive graphite dust generates during the operation of high tempera‐ture gas‐cooled reactor ,w hich exerts certain impacts on operational and environmental safety .In this paper ,the two‐dimensional pebble bed flow field was selected ,and the influence of pebble bed structure on the diffusion and deposition of graphite dust parti‐cles in the reactor core was analyzed by using the discrete phase model .The calculation results show that the pebble bed structure could effectively prevent the spread of the graphite dust particles .T he number of deposited dust particles on the pebble bed increa‐ses with the helium flow rate ,while the trend of the growth is limited due to the inertia of particles and the effect of thermophoresis force .The deposition efficiency of graphite dust particles presents a trend of almost unchanged‐rapid grow th‐slow grow th associated with particle size in the flow field of the pebble bed structure .