Adapting the MgO-CO<sub>2</sub> Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO<sub>3</sub> Content

The MgO-CO<sub>2</sub> working pair has been regarded as prospective for thermochemical energy storage (TCES) due to its relatively high heat storage capacity, low cost, and wide availability. This study is aimed at the optimization of the molar salt content, <i>&#945;</i>...

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Main Authors: Seon Tae Kim, Haruka Miura, Hiroki Takasu, Yukitaka Kato, Alexandr Shkatulov, Yuri Aristov
Format: Article
Language:English
Published: MDPI AG 2019-06-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/12/12/2262
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spelling doaj-56baff73f43e446fb607136b3d196f622020-11-25T01:30:26ZengMDPI AGEnergies1996-10732019-06-011212226210.3390/en12122262en12122262Adapting the MgO-CO<sub>2</sub> Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO<sub>3</sub> ContentSeon Tae Kim0Haruka Miura1Hiroki Takasu2Yukitaka Kato3Alexandr Shkatulov4Yuri Aristov5Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, JapanTokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, JapanTokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, JapanTokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, JapanDepartment of Applied Physics, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The NetherlandsTokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, JapanThe MgO-CO<sub>2</sub> working pair has been regarded as prospective for thermochemical energy storage (TCES) due to its relatively high heat storage capacity, low cost, and wide availability. This study is aimed at the optimization of the molar salt content, <i>&#945;</i>, for the MgO modified with the eutectic mixture of LiNO<sub>3</sub> and KNO<sub>3</sub> (Li<sub>0.42</sub>K<sub>0.58</sub>NO<sub>3</sub>) which was earlier shown to provide high conversion, &#916;<i>x</i>, in heat-storage/release processes at 300&#8722;400 &#176;C. The composites that have different salt content were prepared and carbonation kinetics was investigated under various conditions (carbonation temperature, <i>T</i><sub>carb.</sub>, is 290&#8722;360 &#176;C and CO<sub>2</sub> pressure, <i>P</i>(CO<sub>2</sub>), is 50&#8722;101 kPa). Significant accelerating effect was revealed at <i>&#945;</i> &#8805; 0.05, and the &#916;<i>x</i> value was maximized at <i>&#945;</i> = 0.10&#8722;0.20. The largest conversion of 0.70 was detected at <i>&#945;</i> = 0.10 and <i>T</i><sub>carb.</sub> = 350 &#176;C that corresponds to the specific useful heat (<i>Q</i><sub>comp.</sub>) is 1.63 MJ/kg-composite. However, the salt content of 0.20 ensures the high conversion, &#916;<i>x</i> = 0.63&#8722;0.67 and <i>Q</i><sub>comp.</sub> = 1.18&#8722;1.25 MJ/kg-composite in the whole temperature range between 290 and 350 &#176;C. The (LiK)NO<sub>3</sub>/MgO composite with an optimal salt content of 0.20 exhibits reasonable durability through cyclic experiment at 330 &#176;C, namely, the stabilized reacted conversion &#916;<i>x</i> = 0.34 (<i>Q</i><sub>comp.</sub> = 0.64 MJ/kg-composite). The studied (Li<sub>0.42</sub>K<sub>0.58</sub>)NO<sub>3</sub> promoted MgO-CO<sub>2</sub> working pair has good potential as thermochemical storage material of middle temperature heat (300&#8722;400 &#176;C).https://www.mdpi.com/1996-1073/12/12/2262thermochemical energy storagemagnesium oxidemagnesium carbonatesalt modificationeutectic mixture
collection DOAJ
language English
format Article
sources DOAJ
author Seon Tae Kim
Haruka Miura
Hiroki Takasu
Yukitaka Kato
Alexandr Shkatulov
Yuri Aristov
spellingShingle Seon Tae Kim
Haruka Miura
Hiroki Takasu
Yukitaka Kato
Alexandr Shkatulov
Yuri Aristov
Adapting the MgO-CO<sub>2</sub> Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO<sub>3</sub> Content
Energies
thermochemical energy storage
magnesium oxide
magnesium carbonate
salt modification
eutectic mixture
author_facet Seon Tae Kim
Haruka Miura
Hiroki Takasu
Yukitaka Kato
Alexandr Shkatulov
Yuri Aristov
author_sort Seon Tae Kim
title Adapting the MgO-CO<sub>2</sub> Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO<sub>3</sub> Content
title_short Adapting the MgO-CO<sub>2</sub> Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO<sub>3</sub> Content
title_full Adapting the MgO-CO<sub>2</sub> Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO<sub>3</sub> Content
title_fullStr Adapting the MgO-CO<sub>2</sub> Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO<sub>3</sub> Content
title_full_unstemmed Adapting the MgO-CO<sub>2</sub> Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO<sub>3</sub> Content
title_sort adapting the mgo-co<sub>2</sub> working pair for thermochemical energy storage by doping with salts: effect of the (lik)no<sub>3</sub> content
publisher MDPI AG
series Energies
issn 1996-1073
publishDate 2019-06-01
description The MgO-CO<sub>2</sub> working pair has been regarded as prospective for thermochemical energy storage (TCES) due to its relatively high heat storage capacity, low cost, and wide availability. This study is aimed at the optimization of the molar salt content, <i>&#945;</i>, for the MgO modified with the eutectic mixture of LiNO<sub>3</sub> and KNO<sub>3</sub> (Li<sub>0.42</sub>K<sub>0.58</sub>NO<sub>3</sub>) which was earlier shown to provide high conversion, &#916;<i>x</i>, in heat-storage/release processes at 300&#8722;400 &#176;C. The composites that have different salt content were prepared and carbonation kinetics was investigated under various conditions (carbonation temperature, <i>T</i><sub>carb.</sub>, is 290&#8722;360 &#176;C and CO<sub>2</sub> pressure, <i>P</i>(CO<sub>2</sub>), is 50&#8722;101 kPa). Significant accelerating effect was revealed at <i>&#945;</i> &#8805; 0.05, and the &#916;<i>x</i> value was maximized at <i>&#945;</i> = 0.10&#8722;0.20. The largest conversion of 0.70 was detected at <i>&#945;</i> = 0.10 and <i>T</i><sub>carb.</sub> = 350 &#176;C that corresponds to the specific useful heat (<i>Q</i><sub>comp.</sub>) is 1.63 MJ/kg-composite. However, the salt content of 0.20 ensures the high conversion, &#916;<i>x</i> = 0.63&#8722;0.67 and <i>Q</i><sub>comp.</sub> = 1.18&#8722;1.25 MJ/kg-composite in the whole temperature range between 290 and 350 &#176;C. The (LiK)NO<sub>3</sub>/MgO composite with an optimal salt content of 0.20 exhibits reasonable durability through cyclic experiment at 330 &#176;C, namely, the stabilized reacted conversion &#916;<i>x</i> = 0.34 (<i>Q</i><sub>comp.</sub> = 0.64 MJ/kg-composite). The studied (Li<sub>0.42</sub>K<sub>0.58</sub>)NO<sub>3</sub> promoted MgO-CO<sub>2</sub> working pair has good potential as thermochemical storage material of middle temperature heat (300&#8722;400 &#176;C).
topic thermochemical energy storage
magnesium oxide
magnesium carbonate
salt modification
eutectic mixture
url https://www.mdpi.com/1996-1073/12/12/2262
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