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

doi:10.11949/0438-1157.20191537

Abstract

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

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

CLC Number:

TK 02

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.

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.

Figures/Tables 10

Fig.1 Synthesis procedure of AA/CaCl2 composites

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

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

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

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

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

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

Fig.6 STA measurement results of composite sorbents

Fig.7 Mass energy storage density of composite sorbents

Fig.8 Volumetric energy storage density of composite sorbents

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