活性炭基Na_(3)PO_(4)低温化学蓄热复合材料的制备及性能研究  

The Study of Preparation and Properties of Activated Carbon Based Na_(3)PO_(4) Low Temperature Chemical Thermal Storage Composites

作　　者：林树森 邓立生[1] 吴佳涛 李军 黄宏宇[1,2] LIN Shusen;DENG Lisheng;WU Jiatao;LI Jun;HUANG Hongyu(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;School of Energy Science and Engineering,University of Science and Technology of China,Guangzhou 510640,China)

机构地区：[1]中国科学院广州能源研究所,广州510640 [2]中国科学技术大学能源科学与技术学院,广州510640

出　　处：《工程热物理学报》2023年第11期3046-3051,共6页Journal of Engineering Thermophysics

基　　金：国家重点研发计划资助项目(No.2021YFB1507303);国家自然科学基金资助项目(No.52176091);广州市基础研究计划-基础与应用基础研究项目(No.202102021199);广东省国际及港澳台高端人才交流专项(No.2021A1313030067)。

摘　　要：Na_(3)PO_(4)作为化学蓄热材料具有蓄热温度低、蓄热密度高以及价格便宜等优点,在太阳能低温蓄热方面具有良好的应用前景,但是纯材料易潮解的问题限制了它的应用。本文以活性炭作为多孔基体制备了负载量(质量分数w)分别为0.3、0.5、0.8的活性炭基Na_(3)PO_(4)(R-AC@Na_(3)PO_(4))复合材料,并对其进行形貌结构表征和蓄热性能研究。研究结果表明,在环境温度为30℃以及相对湿度为60%的条件下,活性炭的加入能够大幅提高复合材料的水合速率,在Na_(3)PO_(4)负载量为0.3、0.5、0.8时,复合材料达到水合平衡时间仅为纯材料的30%、35%、40%;复合材料的蓄热密度随着负载量的增加而上升,在0.8的负载量时,可达到675 J·g^(-1)最大蓄热密度,为纯材料的70%。研究为低温化学蓄热材料的研发提供了一定的参考。Na_(3)PO_(4) as a chemical thermal storage material has the advantages of low thermal storage temperature,high thermal storage density and low price,and has good prospects for lowtemperature solar thermal storage applications,but the problem of easy deliquescence of the pure material limits its application.In this paper,activated carbon based Na_(3)PO_(4)(R-AC@Na_(3)PO_(4))composites with loadings(mass fraction w)of 0.3,0.5 and 0.8 were prepared using activated carbon as the porous matrix,and their morphological and structural characterization and thermal storage properties were investigated.The results show that the addition of activated carbon can significantly increase the hydration rate of the composites at an ambient temperature of 30℃ and a relative humidity of 60%,and the time to reach hydration equilibrium is only 30%,35%,and 40%of that of the pure material at Na_(3)PO_(4) loadings of 0.3,0.5,and 0.8;the heat storage density of the composites increases with the increase of the loading,and at 0.8 loading,the maximum heat storage density of 675 J·g^(-1) can be reached,which is 70%of that of the pure material.The study provides a certain reference for the development of low-temperature chemical heat storage materials.

关 键 词：化学蓄热 磷酸三钠 水合速率 蓄热密度 

分 类 号：TK11[动力工程及工程热物理—热能工程]