DEVELOPMENT OF A MOLTEN-SALT THERMOCLINE THERMAL STORAGE SYSTEM FOR PARABOLIC TROUGH PLANTS
DEVELOPMENT OF A MOLTEN-SALT THERMOCLINE THERMAL STORAGE SYSTEM FOR PARABOLIC TROUGH PLANTS
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DOI：
10.1115/1.1464123
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发表时间：
2001-04
影响因子：
2.3
通讯作者：
J. Pacheco;S. Showalter;W. J. Kolb
中科院分区：
文献类型：
--
作者：
J. Pacheco;S. Showalter;W. J. Kolb
蓄热提高了抛物面槽式发电厂的可调度性和市场化，使它们能够独立于太阳能收集而按需发电。其中一个这样的储热系统，温跃层，使用一个单独的容器，容器中装有一种流体，热梯度垂直穿过容器，热流体（低密度）在容器的顶部，冷流体在容器的底部。热梯度把两个温度势分开。低成本的填充材料提供了热存储的大部分热电容，防止对流混合，并减少了所需的流体量。本文介绍了以硝酸熔盐作为传热流体的温跃层系统的发展，并与双罐熔盐系统进行了比较。介绍了候选材料的等温和热循环试验结果以及盐安全性试验结果，以及小型中试（2.3 MWh）温跃层的结果。A =床层横截面积，m2
Thermal storage improves the dispatchability and marketability of parabolic trough power plants allowing them to produce electricity on demand independent of solar collection. One such thermal storage system, a thermocline, uses a single tank containing a fluid with a thermal gradient running vertically through the tank, where hotter fluid (lower density) is at the top of the tank and colder fluid is at the base of the tank. The thermal gradient separates the two temperature potentials. A lowcost filler material provides the bulk of the thermal capacitance of the thermal storage, prevents convective mixing, and reduces the amount of fluid required. In this paper, development of a thermocline system that uses molten-nitrate salt as the heat transfer fluid is described and compared to a two-tank molten salt system. Results of isothermal and thermal cycling tests on candidate materials and salt safety tests are presented as well as results from a small pilot-scale (2.3 MWh) thermocline. NOMENCLATURE A = cross sectional area of bed, m 2