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

Seon Tae Kim, Haruka Miura, Hiroki Takasu, Yukitaka Kato, Alexandr Shkatulov and Yuri Aristov
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Seon Tae Kim: Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan
Haruka Miura: Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan
Hiroki Takasu: Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan
Yukitaka Kato: Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan
Alexandr Shkatulov: Department of Applied Physics, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands
Yuri Aristov: Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan

Energies, 2019, vol. 12, issue 12, 1-13

Abstract: The MgO-CO 2 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, α , for the MgO modified with the eutectic mixture of LiNO 3 and KNO 3 (Li 0.42 K 0.58 NO 3 ) which was earlier shown to provide high conversion, Δ x , in heat-storage/release processes at 300–400 °C. The composites that have different salt content were prepared and carbonation kinetics was investigated under various conditions (carbonation temperature, T carb. , is 290–360 °C and CO 2 pressure, P (CO 2 ), is 50–101 kPa). Significant accelerating effect was revealed at α ≥ 0.05, and the Δ x value was maximized at α = 0.10–0.20. The largest conversion of 0.70 was detected at α = 0.10 and T carb. = 350 °C that corresponds to the specific useful heat ( Q comp. ) is 1.63 MJ/kg-composite. However, the salt content of 0.20 ensures the high conversion, Δ x = 0.63–0.67 and Q comp. = 1.18–1.25 MJ/kg-composite in the whole temperature range between 290 and 350 °C. The (LiK)NO 3 /MgO composite with an optimal salt content of 0.20 exhibits reasonable durability through cyclic experiment at 330 °C, namely, the stabilized reacted conversion Δ x = 0.34 ( Q comp. = 0.64 MJ/kg-composite). The studied (Li 0.42 K 0.58 )NO 3 promoted MgO-CO 2 working pair has good potential as thermochemical storage material of middle temperature heat (300–400 °C).

Keywords: thermochemical energy storage; magnesium oxide; magnesium carbonate; salt modification; eutectic mixture (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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