活性氧化铝基质新型复合吸附剂的制备和储热性能

doi:10.11949/0438-1157.20191537

化工学报 ›› 2020, Vol. 71 ›› Issue (7): 3354-3361.DOI: 10.11949/0438-1157.20191537

• 材料化学工程与纳米技术 • 上一篇下一篇

活性氧化铝基质新型复合吸附剂的制备和储热性能

刘华^1,^2,³(),彭佳杰³,余凯^1,²,倪毅^1,²,王芳^1,²,潘权稳³(),葛天舒³,王如竹³

^1.空调设备及系统运行节能国家重点实验室，广东珠海 517907
^2.珠海格力电器股份有限公司，广东珠海 517907
^3.上海交通大学机械与动力工程学院，上海 200240

收稿日期:2019-12-18 修回日期:2020-03-07 出版日期:2020-07-05 发布日期:2020-07-05
通讯作者: 潘权稳
作者简介:刘华（1977—），男，博士研究生，高级工程师，liuhua@cn.gree.com
基金资助:
空调设备及系统运行节能国家重点实验室开放基金项目(ACSKL2018KT1203);上海市青年科技英才扬帆计划项目(19YF1423100);上海交通大学“新进青年教师启动计划”项目

Preparation and thermal storage performance of novel composite sorbent with activated alumina matrix

Hua LIU^1,^2,³(),Jiajie PENG³,Kai YU^1,²,Yi NI^1,²,Fang WANG^1,²,Quanwen PAN³(),Tianshu GE³,Ruzhu WANG³

^1.State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation, Zhuhai 517907, Guangdong, China
^2.Gree Electric Appliances, Inc. of Zhuhai, Zhuhai 517907, Guangdong, China
^3.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2019-12-18 Revised:2020-03-07 Online:2020-07-05 Published:2020-07-05
Contact: Quanwen PAN

摘要/Abstract

摘要：

研制了一种以活性氧化铝为基质、CaCl₂为吸湿盐的新型复合吸附剂，可用于以水为吸附质的热化学吸附储热系统，并对其内部结构、吸附性能和储热性能进行了研究。利用恒温恒湿箱确定出现溶液泄漏现象的最大含盐量，并对30℃和多种相对湿度工况下的动态和平衡吸附特性进行测量，研究了含盐量和相对湿度对吸附剂的吸附特性的影响，结果表明含盐量和相对湿度越大，复合吸附剂的吸水能力越强。利用全自动比表面积与孔隙度分析仪测量材料的比表面积和孔体积，利用同步热分析仪测试了复合吸附剂的储热密度，其中含盐量最高的复合吸附剂的储热密度最高，质量和体积储热密度分别达到0.51 kW·h/kg和610.2 kW·h/m³，具有良好的储热性能。

关键词: 吸附, 吸附剂, 制备, 储热, 活性氧化铝, 氯化钙

Abstract:

A new type of composite adsorbent based on activated alumina(AA) and CaCl₂as a hygroscopic salt was developed. It can be used in thermochemical adsorption heat storage systems with water as the adsorbent, and its internal structure, adsorption performance and heat storage performance were studied. Samples with different salt contents were fabricated to store low-temperature thermal heat by impregnation methods. Morphologies records, sorption kinetics and thermal energy storage performance of AA/CaCl₂ composite sorbent were investigated. The maximum salt content of the solution leakage phenomenon was determined. Sorption kinetics and equilibrium sorption capacity under conditions of 30℃ and multi relative humidity were studied by utilizing constant temperature and humidity chamber. Influence of salt content and relative humidity on the sorption performance of AA/CaCl₂ composite sorbent was studied. Results showed sorption capacity of AA/CaCl₂ composite sorbent increased with increasing salt content and relative humidity. The specific surface area and pore volume were measured by automatic specific surface area and porosity analyzer. Energy storage density was measured by simultaneous thermal analyzer. The sample with highest salt content had the best energy storage performance with 0.51 kW·h/kg mass energy storage density and 610.2 kW·h/m³ volumetric energy storage density. As a consequence, AA/CaCl₂ composite sorbent is promising sorbent in field of chemisorption thermal energy storage.

Key words: adsorption, sorbent, preparation, heat storage, activated alumina, calcium chloride

中图分类号:

TK 02

刘华, 彭佳杰, 余凯, 倪毅, 王芳, 潘权稳, 葛天舒, 王如竹. 活性氧化铝基质新型复合吸附剂的制备和储热性能[J]. 化工学报, 2020, 71(7): 3354-3361.

Hua LIU, Jiajie PENG, Kai YU, Yi NI, Fang WANG, Quanwen PAN, Tianshu GE, Ruzhu WANG. Preparation and thermal storage performance of novel composite sorbent with activated alumina matrix[J]. CIESC Journal, 2020, 71(7): 3354-3361.

图/表 10

图1 复合吸附剂制作流程示意图

Fig.1 Synthesis procedure of AA/CaCl2 composites

表1 AA和AA/ CaCl2复合吸附剂的含盐量和堆积密度

Table 1 Salt content and bulk density of pure AA and AA/CaCl2 composite sorbents

Sample	Salt content/%(mass)	Bulk density(kg/m³)
AA	0	908.0
AACa5	4.7	923.8
AACa10	6.3	951.6
AACa15	8.3	980.9
AACa20	10.6	1028.2
AACa25	15.3	1123.5
AACa30	17.9	1208.2

图2 活性氧化铝照片（a）;AA（b）、AACa15（c）、AACa30（d）的TEM影像

Fig.2 Photo of pure AA (a) and TEM images of AA (b), AACa15 (c) , AACa30 (d)

图3 AA/ CaCl2复合吸附剂的动态吸附特性曲线（30℃和60%RH）

Fig.3 Sorption kinetics for AA and AA/CaCl2 composite sorbents at 30℃ and 60% RH

图4 复合吸附剂在30℃、不同相对湿度条件下的平衡吸附量

Fig.4 Equilibrium sorption performance of composite sorbents at 30℃ and different RH

图5 复合吸附剂在30℃和60%RH条件下多次吸附/解吸的平衡吸附量

Fig.5 Equilibrium sorption performance of composite sorbents in multi ad-/desorption processes at 30℃ and 60% RH

表2 不同含盐量复合吸附剂的孔比表面积和孔体积

Table 2 Specific surface area and pore volume of AA, AACa15 and AACa30

样品	比表面积/(m²/g)	孔体积/(cm³/g)
AA	238.77	0.39
AACa15	197.73	0.30
AACa30	128.81	0.23

图6 复合吸附剂的STA测试结果

Fig.6 STA measurement results of composite sorbents

图7 复合吸附剂的质量储热密度

Fig.7 Mass energy storage density of composite sorbents

图8 复合吸附剂的体积储热密度

Fig.8 Volumetric energy storage density of composite sorbents

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活性氧化铝基质新型复合吸附剂的制备和储热性能

Preparation and thermal storage performance of novel composite sorbent with activated alumina matrix

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