Lithium bromide-mediated reaction performance enhancement of a chemical heat-storage material for magnesium oxide/water chemical heat pumps

被引：49

作者：

Myagmarjav, Odtsetseg ^{[1
]}

Ryu, Junichi ^{[2
]}

Kato, Yukitaka ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Nucl Engn, Meguro Ku, Tokyo 1528550, Japan

[2] Tokyo Inst Technol, Nucl Reactors Res Lab, Meguro Ku, Tokyo 1528550, Japan

来源：

APPLIED THERMAL ENGINEERING | 2014年 / 63卷 / 01期

关键词：

Chemical heat pump; Magnesium oxide; Magnesium hydroxide; Expanded graphite; Lithium bromide;

D O I：

10.1016/j.applthermaleng.2013.10.045

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The reaction performance enhancement of a chemical heat-storage material for a magnesium oxide/water chemical heat pump was discussed. A new composite, denoted as EML, was developed by mixing pure magnesium hydroxide with lithium bromide and expanded graphite, which were employed as reactivity and heat transfer enhancers, respectively. With respect to pure magnesium hydroxide powder, the EML composite showed higher reaction rates for dehydration and hydration transformations; further, the EML could dehydrate and hydrate at the same reaction temperature (200 degrees C). Addition of LiBr was found to decrease the estimated activation energy in the dehydration. The heat output capacity of the EML composite calculated at a hydration temperature of 110 degrees C was 1405.3 kJ kg(-1), which was higher than that of pure MgO. It was established that the newly developed EML composite is a promising candidate for novel chemical heat-storage materials for chemical heat pumps at working temperatures of 200-300 degrees C. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：170 / 176

页数：7

共 10 条

[1] Thermal energy storage: "How previous findings determine current research priorities" [J].

Fernandes, D. ;

Pitie, F. ;

Caceres, G. ;

Baeyens, J. .

ENERGY, 2012, 39 (01) :246-257

[2] Composite reactants of calcium chloride combined with functional carbon materials for chemical heat pumps [J].

Fujioka, Keiko ;

Hatanaka, Kensuke ;

Hirata, Yushi .

APPLIED THERMAL ENGINEERING, 2008, 28 (04) :304-310

[3] THERMAL DECOMPOSITION OF BRUCITE .2. KINETICS OF DECOMPOSITION IN VACUUM [J].

GORDON, RS ;

KINGERY, WD .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1967, 50 (01) :8-&

[4] Dehydration and hydration behavior of metal-salt-modified materials for chemical heat pumps [J].

Ishitobi, Hirokazu ;

Uruma, Keirei ;

Takeuchi, Masato ;

Ryu, Junichi ;

Kato, Yukitaka .

APPLIED THERMAL ENGINEERING, 2013, 50 (02) :1639-1644

[5] Kinetic study of the hydration of magnesium oxide for a chemical heat pump [J].

Kato, Y ;

Yamashita, N ;

Kobayashi, K ;

Yoshizawa, Y .

APPLIED THERMAL ENGINEERING, 1996, 16 (11) :853-862

[6] Reactivity enhancement of chemical materials used in packed bed reactor of chemical heat pump [J].

Kim, Seon Tae ;

Ryu, Junichi ;

Kato, Yukitaka .

PROGRESS IN NUCLEAR ENERGY, 2011, 53 (07) :1027-1033

[7]

Levenspiel O., 1999, IND ENG CHEM RES

[8] A highly conductive porous medium for solid-gas reactions: Effect of the dispersed phase on the thermal tortuosity [J].

Olives, R ;

Mauran, S .

TRANSPORT IN POROUS MEDIA, 2001, 43 (02) :377-394

[9]

Zamengo M., 2013, APPL THERM ENG, P1

[10]

ZHABROVA GM, 1960, KINETIKA KATALIZ AKA, P31

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