关键词: 离散元, 熔盐罐, 陶粒层, 沉降量

Abstract: For the ceramsite backfill layer at the bottom of the molten salt tank,a corresponding particle simulation model was established based on the EDEM discrete element software platform to simulate the compaction and backfilling process of the ceramsite layer as well as the full-tank operation condition.The research focused on examining the mechanical effects of three pre-compaction processes (natural stacking,single pre-compaction,and 8-stage segmented pre-compaction) on the compression deformation and stress distribution in the ceramsite layer,while also analyzed the influence of different particle size ranges (5-10,10-15,and 15-20 mm) on the heat transfer behavior.The results show that:(1) under an 8-stage segmented pre-compaction process with a layer height of 1.6 m,particle sizes ranging from 5 to 20 mm,and a heavy-tank load of 50 000 t,the maximum internal stress of the ceramsite ranges from 8.0 to 14.4 MPa,with uniform pressure distribution and an overall settlement of 20.44 mm;(2) as the particle size increases,the heat transfer distance gradually extends while the average heat flux decreases;this indicates that smaller particles provide better thermal insulation,with a heat transfer distance of 185.73 mm and an average heat flux of 0.49 W·m^-2 over 50 h,whereas larger particles exhibit higher thermal conductivity and poorer insulation,allowing heat to dissipate more readily,with a corresponding heat transfer distance of 195.65 mm and an average heat flux of 2.31 W·m^-2.

Key words: discrete element, molten salt tank, ceramsite layer, settlement