Effects of Operation Parameters on Heat Transfer in Tubular Moving Bed Heat Exchangers:A CFD-DEM Study  

作　　者：LU Weiqin LI Zhihan TANG Xueyu LIU Dinghe KE Xiwei ZHOU Tuo 

机构地区：[1]Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing,100084,China [2]School of Transportation and Vehicle Engineering,Shandong University of Technology,Ji’nan,255049,China [3]College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan,030024,China

出　　处：《Journal of Thermal Science》2025年第2期542-554,共13页热科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.52276124)。

摘　　要：Tubular moving bed heat exchangers(MBHEs)present inherent advantages for efficiently and stably recovering sensible heat from high-temperature granular bulk.In this study,we introduce a viable and practical approach based on the combined approach of Computational Fluid Dynamics with Discrete Element Method(CFD-DEM)and employ it to conduct a comprehensive investigation into the effects of operation parameters on tubular MBHEs.These parameters include inlet particle temperature(ranging from 500℃to 700℃),tube wall temperature(ranging from 50℃to 250℃),and particle descent velocity(ranging from 0.5 mm/s to 12 mm/s).Our analysis reveals that the heat radiation and gas film heat conduction predominantly govern the heat transfer process in the particle-fluid-wall system,collectively contributing to approximately 90%of the total heat flux of tube wall(Q_(w)^(simu)).The results indicate that increasing the inlet particle temperature and reducing the tube wall temperature intensify heat transfer by enlarging the temperature difference.More interestingly,Q_(w)^(simu) exhibits three distinct stages as particle descent velocity increases,including an ascent stage,a descent stage,and a stable stage.Furthermore,the simulation attempts suggest that the optimal descent velocity for maximizing Q_(w)^(simu) falls within the range of 1.3-2.0 mm/s.These findings not only uncover the precise influence mechanisms of operation parameters on heat transfer outcomes but also offer valuable insights for heat transfer enhancement efficiency in MBHE system.

关 键 词：tubular moving bed heat exchangers heat transfer operation parameters CFD-DEM heat transfer enhancement 

分 类 号：TK172[动力工程及工程热物理—热能工程]