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Thermochemical Energy Storage Based on Carbonates: a Brief Overview

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Thermochemical Energy Storage Based on Carbonates: a Brief Overview energies Editorial Thermochemical Energy Storage Based on Carbonates: A Brief Overview Carlos Ortiz Materials and Sustainability Group, Department of Engineering, Universidad Loyola Andalucía, Av. de las Universidades s/n, Dos Hermanas, 41704 Sevilla, Spain; [email protected] Energy storage is becoming one of the main challenges facing the massive integration of Variable Renewable Energy (VRE) in the coming years. Solar Photovoltaics (PVs) and wind plants are undergoing enormous development, and they are leading the transition to a renewable energy mix. Given its intrinsic variable nature, a huge need for energy storage is expected in the coming decades. Efficient, cost-effective, and scalable energy storage systems stand as one of the main technological challenges for the massive deployment of renewable energies. High-temperature Thermal Energy Storage (TES) systems have undergone great syn- ergistic development together with Concentrating Solar Power (CSP) plants, although the potential of TES includes integration with other types of technologies, such as Pumped Thermal Energy Storage (PTES) or even their integration to store electrical energy. The market for high-temperature thermal storage is largely led by molten salt-based systems. Despite its maturity and acceptable performance, molten salt energy storage presents sev- eral drawbacks, related to corrosiveness, limitation of the maximum working temperature to avoid salt degradation (which limits the efficiency of the power cycle), limitation of the minimum working temperature to avoid salt solidification, as well as an elevated cost (~USD 900/ton). Thermochemical Energy Storage (TCES) is an attractive alternative to Citation: Ortiz, C. Thermochemical molten salt systems. Energy Storage Based on Carbonates: TCES is based on reversible chemical reactions. Energy is provided (storage step) to A Brief Overview. Energies 2021, 14, carry out an endothermic reaction, and, once this has taken place, the products are stored. 4336. https://doi.org/10.3390/ When energy is demanded, the stored materials are promoted to react according to the en14144336 reverse reaction (exothermic), releasing in this way the stored energy. Among the potential TCES, the metal carbonate-based system is one of the most promising alternatives due Received: 10 June 2021 to its high-turning temperature, high-energy density, and usually the low price of the Accepted: 28 June 2021 raw materials. The most well-established system is the one based on calcium carbonate Published: 19 July 2021 (CaCO3/CaO), in the so-called Calcium-Looping (CaL) process [1], although there are other interesting alternatives based on barium carbonate [2], strontium carbonate [3] or Publisher’s Note: MDPI stays neutral magnesium carbonate [4]. with regard to jurisdictional claims in Figure1 shows the conceptual scheme for a TCES based on carbonates. Carbonates published maps and institutional affil- decomposed through the endothermic calcination reaction (Equation (1)), where M gener- iations. ically represents Ca, Sr, Ba, etc. Calcination takes place in a solid–gas reactor, usually under near-to-ambient pressure. Most of the previous research proposed Fluidized Bed (FB) reactors due to their maturity and the high mass and heat transfer provided, although Entrained Flow (EF) reactors could be a promising alternative for the use of fine particles. Copyright: © 2021 by the author. The reaction temperature depends on the equilibrium CO2 partial pressure, also condition- Licensee MDPI, Basel, Switzerland. ing the temperature of the heat to be stored (i.e., CSP). Once calcination occurs, CO2 and This article is an open access article the metal oxide are stored separately after passing through a Heat Exchanger Network distributed under the terms and (HEN) to reduce its storage temperature. The CO2 is compressed usually up to liquid state conditions of the Creative Commons to reduce the storage volume. Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ MCO3(s) + DHr $ MO(s) + CO2(g) (1) 4.0/). Energies 2021, 14, 4336. https://doi.org/10.3390/en14144336 https://www.mdpi.com/journal/energies Energies 2021, 14, x FOR PEER REVIEW 2 of 4 Energies 2021, 14, 4336 2 of 3 () +∆ ↔() + () (1) FigureFigure 1. 1. Carbonate-basedCarbonate-based TCES TCES conceptual conceptual scheme. Adapted fromfrom [[5].5]. WhenWhen energy energy is is demanded, demanded, the the metal oxide and COCO22 stored stored are are sent sent to to the the carbonator carbonator (another(another gas–solid gas–solid reactor) reactor) where where carbonation carbonation occurs, occurs, releasing releasing the the stored stored energy energy for elec- for tricityelectricity production production through through a power a power cycle. cycle. Carbonation Carbonation temperature temperature is also is also conditioned conditioned by theby CO2 the CO equilibrium2 equilibrium pressure. pressure. Importantly, Importantly, th thee higher higher the the carbonation temperature,temperature, the the higher the temperature heat to be provided to the power cycle, increasing the thermal-to- higher the temperature heat to be provided to the power cycle, increasing the thermal-to- electric efficiency. electric efficiency. Metal carbonates are promising materials due to several key advantages: Metal carbonates are promising materials due to several key advantages: • Carbonate systems have a high theoretical energy density, which allows for maxi- • Carbonate systems have a high theoretical energy density, which allows for maxim- mizing the storage capacity. It is worth highlighting, in this case, the systems based izing the storage capacity. It is worth highlighting, in this case,3 the systems based on on CaCO3/CaO, SrCO3/SrO and MgCO3/MgO (~3–4 GJ/m ). These values are 3 CaCO~10 times3/CaO, higher SrCO than3/SrO sensible and MgCO heat3 storage/MgO (~ systems3–4 GJ/m (i.e.,). These molten values salts); are despite ~10 times this, higherit must than be consideredsensible heat that storage the systems systems are (i.e., more molten complex, salts); requiring despite this, tanks it formust the be consideredstorage of productsthat the systems (solid and are gas/liquid). more comp Thus,lex, requiring the real energy tanksdensity for the ofstorage carbon- of productsate TCES (solid systems and dependsgas/liquid). on materialThus, the properties, real energy reaction density efficiencyof carbonate and TCES process sys- temsconfiguration depends [on6]. material properties, reaction efficiency and process configuration • [6].Carbonates are widely available, usually cheap, and environmentally friendly. Cal- • Carbonatescium carbonate are widely stands available, out, one of usually the most cheap, abundant and environmentally materials on the friendly. planet, and Cal- ciumwith carbonate a large-scale stands price out, of around one of EUR the 10/tonmost abundant (two orders materials of magnitude on the lowerplanet, than and withthe pricea large-scale of solar salts).price of around EUR 10/ton (two orders of magnitude lower than • theA keyprice advantage of solar salts). over molten salt systems is the ability to store products at ambient • Atemperature, key advantage which over significantly molten salt reduces systems electricity is the ability consumption to store products and eliminates at ambient the temperature,risks derived which from thesignificantly solidification reduces of salts. electricity This makes consumption the system and more eliminates flexible, the risksincreasing derived the from energy the storage solidification capacity inof dayssalts. or This even makes weeks, the although system it alsomore increases flexible, increasingthe complexity the energy of the storage heat exchangers capacity in network days or when even itweeks, comes although to recovering it also the in- creasessensible the heat complexity of the materials of the atheat the exchangers exit of the endothermic network when reactor it comes (high temperature).to recovering • Several carbonates have a high-turning temperature, which gives them the ability the sensible heat of the materials at the exit of the endothermic reactor (high temper- to release heat through the exothermic reaction at temperatures higher than 900 ◦C ature). and, therefore, the possibility of integrating with high-efficiency power cycles, such • Several carbonates have a high-turning temperature, which gives them the ability to as combined cycles, supercritical Rankine cycles or Brayton Cycles. They stand out: release heat through the exothermic reaction at temperatures higher than 900 °C and, SrCO3, BaCO3, PbCO3 and CaCO3. • therefore,Regarding the the possibility materials andof integrating equipment, wi carbonateth high-efficiency TCES is basedpower on cycles, solid–gas such re- as combinedactions, which cycles, gives supercritical the system Rankine an extra degreecycles or of complexityBrayton Cycles. compared They to stand systems out: SrCO3, BaCO3, PbCO3 and CaCO3. based on sensible heat. Nevertheless, in the case of CaCO3/CaO TCES, there is a closeness with the cement industry (reactors, vessels, cyclones, etc.), which facilitates the deployment of the technology. Energies 2021, 14, 4336 3 of 3 The renewables-driven calciner is the main challenge of the technology. In addition, the handling of high-temperature solids must also be investigated in detail when scaling up the technology. Problems, such as material agglomeration, could compromise the plant operation. Another challenge in the case of TCES carbonates is the progressive
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