摘要
在“碳达峰·碳中和”目标引领下,我国正大力发展可再生能源,并针对供需不平衡、时空差异、间歇性和不稳定性等本质问题,积极发展储能技术。热化学吸附储热具有高储热密度、散热损失小等优点,是最具发展前景的储热技术之一。沸石是吸附储热应用最为成熟的材料,但是存在储热密度相对低等缺点。利用水合盐浸渍沸石是改善上述问题的有效方法,但是在沸石/水合盐复合材料中缺少针对水合盐最佳配比的系统研究。利用了常用的MgSO_(4)·7H_(2)O,MgCl_(2)·6H_(2)O,LaCl_(3)·7H_(2)O,CaCl_(2)·2H_(2)O等四种水合盐材料浸渍沸石,制备了不同质量分数的沸石/水合盐吸附储热材料,对其吸附性能、储热密度和循环性能进行了深入研究。结果表明,浸渍沸石的MgCl_(2)最佳质量分数为30%,在80%RH下具有最佳的吸附性能和最高的储热密度,分别为44.99%与638.9 J/g,其次为浸渍沸石的MgSO_(4),吸附质量和储热密度在80%RH下为38.0%和568.5 J/g。在后续循环实验的结果表明,浸渍10%MgSO_(4)的沸石复合材料具有最佳的循环稳定性,但吸附性能和储热密度低于30%质量分数的沸石/MgCl_(2)储热材料。研究结果有助于完善沸石/水合盐复合材料的研究,为沸石储热材料的性能提升和应用提供参考。
Toward the goal of"reaching the peak of carbon and carbon neutrality,"China is vigorously developing renewable energy and actively developing energy storage technology to address the critical problems of supply and demand imbalance-space-time difference,intermittence,and instability.Thermochemical adsorption heat storage offers the advantages of high heat storage density and low heat loss,making it one of the most promising heat storage technologies.Zeolite is well-known for its applications in adsorption and heat storage,but it has the disadvantage of relatively low heat storage density.Impregnating zeolite with hydrated salts can effectively address these problems.However,systematic research on the optimal ratio of hydrated salts in zeolite/hydrated salt composites is lacking.In this study,zeolite was impregnated with four commonly used hydrated salt materials,namely,MgSO_(4)·7H_(2)O,MgCl_(2)·6H_(2)O,LaCl_(3)·7H_(2)O,and CaCl_(2)·2H_(2)O.Adsorption and heat storage materials composed of zeolite/hydrated salt with different mass fractions were then prepared.The adsorption properties,heat storage density,and cycling properties of these materials were examined comprehensively.The results showed that the optimum mass fraction of MgCl_(2) impregnated with zeolite was 30%.This material achieved the best adsorption performance(44.99%)and the highest heat storage density(638.9 J/g)at 80%relative humidity(RH).The second-best performance was achieved by MgSO_(4) impregnated with zeolite,which had an adsorption mass of 38.0%and a heat storage density of 568.5 J/g at 80%RH.The results of subsequent cyclic experiments showed that the zeolite composite impregnated with 10%MgSO_(4) had the best cyclic stability but lower adsorption property and heat storage density than the zeolite/MgCl_(2) heat storage material with a 30%mass fraction.This work will support research on zeolite/hydrated salt composites and provide a reference for the performance improvement and application of zeolite heat storage materials.
作者
陈一鸣
凌浩恕
刘猛
徐玉杰
沈国清
贾运
陈海生
CHEN Yiming;LING Haoshu;LIU Meng;XU Yujie;SHEN Guoqing;JIA Yun;CHEN Haisheng(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;China National Institute of Standardization,Beijing 100191;University of Chinese Academy of Sciences,Beijing 101408,China;Key Laboratory of Long-Duration and Large-Scale Energy Storage(Chinese Academy of Sciences),Beijing 100190,China)
出处
《储能科学与技术》
北大核心
2025年第7期2853-2864,共12页
Energy Storage Science and Technology
基金
国家重点研发计划(2024YFB2408800)
中国科学院战略性先导科技专项(XDA0400000)
中国科学院青年促进会(2023154)
中国科学院国际合作局对外合作重点项目资助(117GJHE2023009MI)。
关键词
吸附储热
沸石
水合盐
吸附性能
储热密度
adsorption heat storage
zeolite
hydrous salt
adsorption performance
heat storage density
