Dehydration and hydration behavior of metal-salt-modified materials for chemical heat pumps

Ishitobi, Hiroyuki; Uruma, Keirei; Takeuchi, Masato; Ryu, Junichi; Kato, Yukitaka

doi:10.1016/j.applthermaleng.2011.07.020

Cited by 73 publications

(82 citation statements)

References 12 publications

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“…Many researches investigate the thermal energy storage using a reversible magnesium oxide/water reaction [62][63][64][65][66][67][68][69][70][71]. To test the possibility of a developing magnesium oxide/water system, Kato et al [66] performed the kinetic study of the hydration of magnesium oxide.…”

Section: Chemical Reaction Heat Storagementioning

confidence: 99%

A review of promising candidate reactions for chemical heat storage

Yan

Wang

et al. 2015

Renewable and Sustainable Energy Reviews

315

135

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Section: Chemical Reaction Heat Storagementioning

confidence: 99%

A review of promising candidate reactions for chemical heat storage

Yan

Wang

et al. 2015

Renewable and Sustainable Energy Reviews

315

135

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“…16,17) Therefore, two assumptions were made: 1) dehydration occurred homogeneously in the particles because vapor diffusivity was fast enough than chemical reaction on the particle; and 2) Mg(OH)2 dehydration proceeded as a first-order reaction. (10) With regard to the initial condition, x = x0 at td = 0.…”

Section: Kinetic Analysis Of Dehydration and Hydrationmentioning

confidence: 99%

Waste Heat Recovery from Iron Production by Using Magnesium Oxide/Water Chemical Heat Pump as Thermal Energy Storage

2015

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A heat recovery system based on thermal energy storage from the iron-making process at medium temperature range (200-300°C) is presented. For an efficient waste heat recovery system the selection of suitable thermal energy storage material is essential. Accordingly, a new candidate for a chemical heat storage material used in a magnesium oxide/water chemical heat pump at medium-temperature was developed in this study. The new composite, named EML, was fabricated by mixing pure magnesium hydroxide with lithium bromide and expanded graphite, which are employed as reactivity and heat transfer enhancers, respectively. The effects of mass mixing ratios w of EG to Mg(OH)2 on dehydration and hydration were investigated by a thermogravimetric (TG) method, with the result that the w of 0.83 was the optimal mass mixing ratio for the EML composite. Thereby the heat output capacities of the EML composite (w = 0.83) were evaluated with varying reaction vapor pressure and hydration temperature. Heat output capacity per unit initial weight of the EML composite (w = 0.83) was calculated as 1 168.7 kJ kgEML -1 at a hydration temperature of 110°C and reaction vapor pressure of 57.8 kPa. This value was 1.2 times higher than the corresponding heat output capacity of pure Mg(OH)2 powder (958.5 ). This result showed that the EML composite has sufficient heat output capacity and mold-ability provided by EG for practical use in a heat exchange reactor. Thus, this composite could potentially be used as chemical heat storage materials for thermal heat storage.KEY WORDS: iron and steel production; medium temperature waste; chemical heat storage.

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“…Kato et al [14] decreased dehydration temperature by mixing Li(OH) 2 with Mg(OH) 2 . Ishitobi et al [15] decreased dehydration temperature by using LiCl 2 as an additive. Shkatulov et al [16] utilized expanded vermiculite to enhance the performance of heat conduction in Mg(OH) 2 .…”

Section: And the Reaction Equation Is As Followsmentioning

confidence: 99%