化学工程2026，Vol.54Issue(8)：37-41,47,6.DOI:10.3969/j.issn.1005-9954.2026.08.007
基于热阻分析的高温球床辐射传热模型
High-temperature pebble bed radiation heat transfer model based on thermal resistance analysis
摘要
Abstract
High-temperature pebble beds are widely used in nuclear energy systems such as HTGR(high-temperature gas-cooled reactor),their heat transfer characteristics significantly impact reactor safety.A theoretical model for radiative heat transfer between spherical fuel particles was established based on thermal resistance analysis.By deriving the equivalent radiative thermal resistance between particles and combining it with contact conduction mechanisms,a correlation for the radiative effective thermal conductivity of high-temperature pebble beds was developed.A packing density correction factor was introduced to improve the model's adaptability to actual pebble bed structures.Validation against experimental data from Tsinghua University's PBEC(pebble bed equivalent conductivity)facility demonstrates good predictive accuracy under typical HTGR operating conditions.Above 1 100℃,radiative heat transfer contributes over 80％to the effective thermal conductivity of pebble beds,becoming the dominant heat transfer mechanism.Surface emissivity exhibits a significant nonlinear positive correlation with effective thermal conductivity,showing dual characteristics of enhanced absolute effects and reduced relative sensitivity at high temperatures.Increasing packing density suppresses radiative heat transfer,leading to decreased effective thermal conductivity.This research provides theoretical foundations and computational methods for thermal design of HTGR pebble bed cores.关键词
热辐射/热阻/高温球床/有效导热系数Key words
thermal radiation/thermal resistance/high-temperature pebble bed/effective thermal conductivity coefficient分类
能源科技引用本文复制引用
李杰,邱文誉,吴浩,牛风雷..基于热阻分析的高温球床辐射传热模型[J].化学工程,2026,54(8):37-41,47,6.基金项目
国家自然科学基金资助项目(12105101,12027813) （12105101,12027813）
