Mass‐transfer parameters in gas‐solid reactive media to identify permeability of IMPEX

Lu, Hui-Bo; Mazet, Nathalie

doi:10.1002/aic.690451117

Cited by 17 publications

(7 citation statements)

References 9 publications

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“…Additionally, increasing the density of the compound decreases its porosity (ε), which decreases the overall permeability of the compound as well. As it was shown by [1,3,4] and Hedayat [9]the reduction of the permeability of the compound below 10 -15 m 2 can have a significant effect on the transport behavior of the ammonia in the reactive compounds(Table 2). Figure 3 shows a comparison of the measured permeability of magnesium chloride (MgCl 2 ) and graphite reactive compounds with the values reported by Han [7]&L'Haridon [6] for manganese chloride (MnCl 2 ) and graphite compounds.…”

Section: Resultsmentioning

confidence: 85%

“…The raw salt used for all the experiments was 99% pure anhydrous magnesium chloride (MgCl 2 ) purchased from Alfa Aesar2F 2 company, and the graphite was purchased from Asbury Carbons3F 3 . The anhydrous magnesium chloride salt was put into the reactor tube and absorbed ammonia gas to form magnesium chloride hexammoniate (MgCl 2 .6NH 3 ).…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…In studying the performance of solid-gas reactive compounds, it was shown that the thermal conductivity and permeability of the reactive compound play an important role in controlling and advancement of the reaction [1][2][3][4][5][6][7]. Similarly, in the reaction of ammonia with the magnesium chloride, the permeability of the salt matrix can be the determining factor for the reaction being constrained by the diffusion of either heat or gas through the reactive compound.…”

Section: Introductionmentioning

confidence: 99%

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Permeability of MgCl2- Graphite Reactive Compound

Mofidi¹,

Udell

2020

RDMS

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Mass transfer limitations due to decreasing permeabilities of the absorbing matrix has been observed to decrease the performance of thermochemical energy storage systems. In this study, the permeability of a reactive complex consisting ammoniated magnesium chloride salt and graphite was measured. It was shown that the permeability of the compound depends on the bulk density of the compound, as well as the amount of NH3absorbed in the magnesium chloride matrix. Additionally, the permeability of magnesium chloride (MgCl2) ammoniate reactive compound is compared with the permeability of the manganese chloride (MnCl2) reactive compound reported by other researchers. The two salts have similar reactions with ammonia gas with similar reaction kinetics. Although the graphite contents of the reactive compounds were different, it is shown that the permeabilities of both compounds are within the same order of magnitude. However, it is shown that upon absorbing ammonia, the permeability decrease in magnesium chloride compound was larger than the decrease of permeability in the manganese chloride compound.

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Section: Resultsmentioning

confidence: 85%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Permeability of MgCl2- Graphite Reactive Compound

Mofidi¹,

Udell

2020

RDMS

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“…As similar models for closed systems have already been validated in previous works [29,36,37], this validation focuses on open systems due to available experimental results of a prototype of thermochemical energy storage [32]. This experimental set up is beyond the scope of this paper, and it is only briefly described here.…”

Section: Validation Of the Modelmentioning

confidence: 99%

Comparison of closed and open thermochemical processes, for long-term thermal energy storage applications

Michel

Neveu

Mazet

2014

Energy

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131

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This paper focuses on the study of a solid/gas thermochemical reaction between a porous reactive bed and vapor. The objective is to determine the operating mode, either closed or open system, that best suits the requirements of a thermochemical seasonal storage applied to house heating. These two working modes have been compared thanks to two validated 2D models. This study shows that for the chosen set of parameters, the two operating modes lead to close global performances (the average specific power is 0.96 and 1.13 W/kg respectively for open and closed operating mode). Thus, the open thermochemical reactor, which presents technical advantages (easier conception and management, lower cost, …), is a promising way to implement a thermochemical process as long-term heat storage. Moreover, simulations allow identifying the main limitations for each working mode and the ways to reduce them. Nomenclature c molar heat capacity, J•mol -1 •K -1 standard enthalpy of reaction, J•mol -1 s c m heat capacity, J.kg -1 •K -1 standard entropy of reaction, J•mol -1 s •K -1

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“…Let's recall that the storage density depends on the density of the reactive bed, and the thermal power depends on the kinetics and heat and mass transfers through the bed. Moreover, Lu et al showed [21] that for reactive bed at high density, the mass transfers through the bed are a key point. Thus, the various implementations under study aim at increasing the energy density of the reactive bed (by compacting it), but without penalizing mass transfers (by selecting texture parameters such as grain size, by adding a porous binder or a gas diffuser).…”

Section: Introductionmentioning

confidence: 99%

Thermochemical process for seasonal storage of solar energy: Characterization and modeling of a high density reactive bed

Michel

Mazet

Mauran

et al. 2012

Energy

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169

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Abstract:This paper focuses on the characterization and modeling of a solid/gas thermochemical reaction between a porous reactive bed and moist air flowing through it. The aim is the optimization of both energy density and permeability of the reactive bed, in order to realize a high density thermochemical system for seasonal thermal storage for house heating application. Several samples with different implementation parameters (density, binder, diffuser, porous bed texture) have been tested. Promising results have been reached: energy densities about 430-460 kWh.m -3 and specific powers between 1.93 and 2.88 W.kg -1 of salt. A model based on the assumption of a sharp reaction front moving through the bed during the reaction was developed. It has been validated by a comparison with experimental results for several reactive bed samples and operating conditions. Keywords:Thermochemical process, seasonal thermal storage, sharp front model, high-density reactive salt, permeability.

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Mass‐transfer parameters in gas‐solid reactive media to identify permeability of IMPEX

Cited by 17 publications

References 9 publications

Permeability of MgCl2- Graphite Reactive Compound

Permeability of MgCl2- Graphite Reactive Compound

Comparison of closed and open thermochemical processes, for long-term thermal energy storage applications

Thermochemical process for seasonal storage of solar energy: Characterization and modeling of a high density reactive bed

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