Ca(OH) 2 /CaO reversible reaction in a fluidized bed reactor for thermochemical heat storage

Abstract

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 15980To link to this article : Michel Ca(OH)2/CaO reversible reaction in a fluidized bed reactor for thermochemical heat storage. AbstractThermal energy storage (TES) is a key factor for increasing the efficiency of concentrated solar power plants. TES using a reversible chemical reaction appears to be a promising technology for high energy density thermal storage (100-500 kW h m À3 ), at high temperature (up to 1000°C) and during a long period (24 h to several months). This paper details an experimental study to carry out the reversible reaction Ca(OH) 2(s) + DH r () CaO (s) + H 2 O (g) in a fluidized bed (FB) reactor. The 4 lm Ca(OH) 2 powder fluidization has been performed with an appropriate proportion of inert easy-to-fluidize particles. Then, Ca(OH) 2 dehydration and CaO hydration have been implemented in a FB reactor and 50 cycles have been reached. The mean energy density obtained is 60 kW h m À3 solid_mixture which amounts to a promising energy density of 156 kW h m À3 Ca(OH) 2 -bulk if the reactants and the easy-to-fluidize particles are separated. The results demonstrated the feasibility of the implementation of the Ca(OH) 2 /CaO thermochemical heat storage in a fluidized bed reactor.

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“…Various systems can be considered, other than metal oxides [3,7]. For example, hydroxides, and especially calcium hydroxide [8][9][10][11][12][13][14] shows promising results for TCES. The systems based on carbonates are also relevant for TCES application.…”

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“…Since the early 80s, many researchers have paid attention to this issue, so that literature abounds in papers reporting on feasibility studies of storage materials . However, it is in the field of latent heat storage materials, which are usually called phase change materials (PCMs), where we can find the majority of these studies.…”

“…Since the early 80s, many researchers have paid attention to this issue, so that literature abounds in papers reporting on feasibility studies of storage materials. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] However, it is in the field of latent heat storage materials, which are usually called phase change materials (PCMs), where we can find the majority of these studies. This is due to the large number of PCMs that are suitable for applications in a very wide temperature range [18][19][20][21][22][23] (from 0°C to 800°C).…”

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“…Accordingly, thermal energy storage (TES) is recognized as one of the key technologies for exploiting solar energy . To date, many methods, including sensible heat storage, latent heat storage, and reversible chemical reaction heat storage, have been studied for TES. Among these TES methods, latent heat thermal energy storage (LHTES) based on phase‐change materials (PCMs) is the most effective primary technique due to its characteristics of high heat storage density, approximately isothermal behavior, and wide range of phase‐change temperatures .…”

“…[2] Accordingly,t hermal energy storage (TES) is recognized as one of the key technologies for exploiting solar energy. [3] To date,m any methods,i ncluding sensible heat storage, [2] latent heat storage, [4] and reversible chemical reaction heat storage, [5] have been studied for TES.A mong these TES methods,l atent heat thermal energy storage (LHTES) based on phase-change materials (PCMs) is the most effectivep rimary technique due to its characteristics of high heat storage density,a pproximately isothermal behavior, and wide range of phase-change temperatures. [6,7] As am ediumo fe nergy storage,P CM can absorb or release abundant latent heat at the melting or freezing point when the surrounding temperature increases or decreases; [8] this means it can be used in aw ide rangeo fa pplications,i ncluding energy-saving buildings, [9,10] latent functionallyt hermal fluids, [11] smart textiles, [12] and solar energy storage.…”