化工学报2018，Vol.69Issue(1)：363-370,8.DOI:10.11949/j.issn.0438-1157.20171024
蛭石/氯化钙复合吸附剂的吸附特性和储热性能
Sorption characteristics and thermal storage performance of expanded vermiculite/CaCl2 composite sorbent
摘要
Abstract
To store low-temperature heat below 120℃, novel expanded vermiculite/CaCl2 composite sorbents with four different salt contents were developed by impregnation methods.Morphologies records, sorption kinetics measurements, simultaneous thermal analyses (STA) and theoretical calculations of energy storage density were implemented on EV/CaCl2 sorbents, with EV and CaCl2·H2O as reference.Scanning electron microscope (SEM) imagines indicate that EV has huge pore volume with numerous layers, which contributes to relative high salt content without the worry issue of solution leakage.Simulative sorption experiment was conducted to identify threshold salt content that composite sorbents can hold without solution leakage.The sorption kinetics and equilibrium sorption capacity were obtained utilizing a constant temperature and humidity chamber, and the influence of salt content and relative humidity on sorption performance was analyzed.The quantitative analysis of total water uptake demonstrates that their sorption process consists of three different phases:physical adsorption, chemical adsorption and liquid-gas absorption of CaCl2 solution.Furthermore, water uptake, sorption heat and reaction temperature of each sorption process were obtained by analyzing the STA measurements.In general, EV/CaCl2 composite sorbent with salt content of 47.9％ was selected as the optimal sorbent, whose water uptake,mass energy storage density and volumetric energy storage density can reach as high as 1.12 g·g-1, 1.25 kW·h-1·kg-1, 213.56 kW·h·m-3, respectively.关键词
吸附剂/蛭石/氯化钙/吸附性能/反应动力学/储热密度/太阳能Key words
sorbents/expanded vermiculite/calcium chloride/sorption characteristics/reaction kinetics/thermal storage density/solar energy分类
能源科技引用本文复制引用
张艳楠,王如竹,李廷贤..蛭石/氯化钙复合吸附剂的吸附特性和储热性能[J].化工学报,2018,69(1):363-370,8.基金项目
国家自然科学基金优秀青年科学基金项目(51522604) （51522604）
国家自然科学基金创新研究群体科学基金项目(51521004). supported by the National Natural Science Funds for Excellent Young Scholar of China (51522604) and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(51521004). （51521004）
