一种新型单罐多层填充床蓄热器蓄热性能研究

In this paper, a transient, two-dimensional, axisymmetric porous medium model was developed for analyzing the effects of thermocline thickness on the thermal performance of a packed-bed molten salt thermocline tank. Based on the model, the effects of the filler's thermal physical properties, including the heat capacity and conductivity, were investigated. And the variations of thermocline thickness and performance of tanks using five fillers were compared. Based on the above results, a novel multi-layered packed-bed molten salt thermocline tank was designed for controlling the thermocline expansion. An increase of 27.09% in useful thermal energy with a drop of 0.64% in thermal efficiency was observed in the quartzite-cast iron-high temperature concrete three-layered thermocline tank compared with that of traditional quartzite single-layered thermocline tank.