操作参数对熔融盐高温斜温层蓄热性能的影响

首先提出了一种新型熔融盐高温斜温层耦合蓄热单罐系统,然后基于多孔介质局部热平衡理论,建立了熔融盐高温斜温层蓄热的局部热平衡数值模拟模型,研究了熔融盐进口流速、进口温度及工作温差等操作参数对斜温层蓄热单罐热性能的影响,并在熔融盐传热-蓄热实验平台上进行了试验研究。发现:当进口速度为0 001 m/s级及降低工作温差等有利于降低斜温层厚度,模拟得到的蓄热单罐轴向温度分布变化与实验结果趋于一致。因此,合理选取这些参数对蓄热单罐的正常运行是非常必要的,结果可以用于指导蓄热单罐的设计。

Effect of Operational Parameters on the the High-Temperature Thermocline Thermal Energy Storage With Molten Salt Materials

In this paper,first,a new type of high-temperature thermocline coupled thermal storage with molten salt materials has been put forward.Then,based on the local thermal equilibrium(LTE) assumption,the heat transfer and heat storage simulation model of the single-phase flow through porous media in the molten salt thermocline system is provided,and the influences of the operating conditions on the thermal energy storage performance are analyzed.Finally,some experiments are carried out on a testing platform of molten salt heat transfer.The results shows that to control the inlet velocity at the level of 0.001 m/s and decrease the operating temperature difference are favorable to the decrease of thermocline layer thickness,and that simulated axial temperature distribution varies with time,which has a tendency similar to that of the experimental results.Thus,the results will provide an important basis for the design and operation control of the molten salt high temperature thermocline system.