Next Article in Journal
Hourly CO2 Emission Factors and Marginal Costs of Energy Carriers in Future Multi-Energy Systems
Next Article in Special Issue
Fluid Retrofit for Existing Vapor Compression Refrigeration Systems and Heat Pumps: Evaluation of Different Models
Previous Article in Journal
A Current-to-Voltage DC-DC Converter for Powering Backbone Devices of Scientific Cabled Seafloor Observatories
Previous Article in Special Issue
Analysis of a Lab-Scale Heat Transformation Demonstrator Based on a Gas–Solid Reaction
Open AccessArticle

Adapting the MgO-CO2 Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO3 Content

1
Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan
2
Department of Applied Physics, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands
3
Boreskov Institute of Catalysis, Ac. Lavrentiev av. 5, Novosibirsk 630090, Russia
*
Author to whom correspondence should be addressed.
The original paper was presented in: Shkatulov, A.I., Kim, S.T., Kato, Y., Aristov, Yu.I. Adapting the MgO-CO2 working pair for thermochemical energy storage by doping with salts. Riehl, R., Preißinger, M., Eames, I., Tierney, M., Eds. In Proceedings of the Heat Powered Cycles Conference 2018, Bayreuth, Germany, 16–19 September 2018; ISBN 978-0-9563329-6-7.
Energies 2019, 12(12), 2262; https://doi.org/10.3390/en12122262
Received: 30 April 2019 / Revised: 8 June 2019 / Accepted: 11 June 2019 / Published: 13 June 2019
(This article belongs to the Special Issue Selected Papers from Heat Power Cycles Conference 2018)
  |  
PDF [5317 KB, uploaded 13 June 2019]
  |  

Abstract

The MgO-CO2 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 LiNO3 and KNO3 (Li0.42K0.58NO3) which was earlier shown to provide high conversion, Δx, 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, Tcarb., is 290–360 °C and CO2 pressure, P(CO2), is 50–101 kPa). Significant accelerating effect was revealed at α ≥ 0.05, and the Δx value was maximized at α = 0.10–0.20. The largest conversion of 0.70 was detected at α = 0.10 and Tcarb. = 350 °C that corresponds to the specific useful heat (Qcomp.) is 1.63 MJ/kg-composite. However, the salt content of 0.20 ensures the high conversion, Δx = 0.63–0.67 and Qcomp. = 1.18–1.25 MJ/kg-composite in the whole temperature range between 290 and 350 °C. The (LiK)NO3/MgO composite with an optimal salt content of 0.20 exhibits reasonable durability through cyclic experiment at 330 °C, namely, the stabilized reacted conversion Δx = 0.34 (Qcomp. = 0.64 MJ/kg-composite). The studied (Li0.42K0.58)NO3 promoted MgO-CO2 working pair has good potential as thermochemical storage material of middle temperature heat (300–400 °C). View Full-Text
Keywords: thermochemical energy storage; magnesium oxide; magnesium carbonate; salt modification; eutectic mixture thermochemical energy storage; magnesium oxide; magnesium carbonate; salt modification; eutectic mixture
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Kim, S.T.; Miura, H.; Takasu, H.; Kato, Y.; Shkatulov, A.; Aristov, Y. Adapting the MgO-CO2 Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO3 Content. Energies 2019, 12, 2262.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top