【摘要】 采用熔盐储热是解决高效、低成本储能与实现减碳减排目标之间矛盾的一种有效途径。以熔融盐为储热介质，熔盐蓄热单罐储热系统能够实现太阳能―热能的有效转换，并可以用来存储和释放能量。选取不同几何形状的内壳式蓄热单罐模型，利用Fluent数值软件，计算各模型的PCM(Phase Change Material,简称PCM)平均温度和热罐内部液相分数并进行对比分析，结果显示，四棱柱管壳式储热罐的蓄热量较好，蓄热速率较大且储热性能更优。选择四棱柱管壳式蓄热罐作为研究对象，通过改变导热流体的进口温度和流速以及相变材料的导热系数，分析不同工况下PCM平均温度的变化：当导热流体进口温度从597 K上升到747 K时，管壳式蓄热罐中的PCM平均温度由394 K升高到441 K；在导热流体进口速度由0.3 m/s上升到2.2 m/s的过程中，蓄热罐中的PCM平均温度由446 K上升到473 K；导热系数在0.277 W/(m·K)增加到1.277 W/(m·K)的过程中，PCM平均温度增高约27 K。该研究可为蓄热单罐的优化设计及应用提供一定参考。更多还原

【Abstract】 Using molten salt heat storage is an effective way to solve the contradiction between efficient and low-cost energy storage mode and achieving the goal of carbon reduction and emission reduction.With molten salt as the heat storage medium,the molten salt heat storage single tank heat storage system can realize the effective conversion of solar energy to heat energy,and can be used to store and release energy.The single tank models with different geometric shapes are selected,and the average temperature of PCM(Phase Change Material) and the liquid fraction in the hot tank are calculated and compared by using Fluent numerical software.The results show that the quadrangular prism shelland-tube heat storage tank has better heat storage capacity, higher heat storage rate and better heat storage performance.The quadrangular prism shell-and-tube heat storage tank is selected as the research object.By changing the inlet temperature and flow rate of heat conducting fluid and the thermal conductivity of phase change materials,the change of PCM average temperature under different working conditions is analyzed.The results show that the average temperature of PCM in the shell-and-tube heat storage tank increases from 394K to 441K when the inlet temperature of heat transfer fluid increases from 597K to 747K.When the inlet velocity of heat transfer fluid increases from 0.3m/s to 2.2m/s, the average PCM temperature in the heat storage tank increases from 446K to 473 K;When the thermal conductivity increases from 0.277W/(m·K) to 1.277W/(m·K),the average temperature of PCM increases by about 27K.更多还原