Study of the performances of an oxygen carrier: Experimental investigation of the binder's contribution and characterization of its structural modifications

Blas, Lucia; Dorge, Sophie; Dutournié, Patrick; Lambert, Arnold; Chiche, David; Bertholin, Stéphane; Josien, Ludovic

doi:10.1016/j.crci.2014.07.005

Cited by 7 publications

(11 citation statements)

References 45 publications

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“…Nevertheless, the total capacity of reduction (i.e., the total amount of available oxygen) increases with temperature as shown in Table 1. These results are in agreement with previous results [22] showing chemical control of the reaction in this range of temperature. Figure 10 shows the experimental breakthrough curves carried out at 700 and 900 • C. As with the test at 800 • C (test 14), the simulations are in good agreement with the experimental results.…”

Section: Reactor and Oxygen Carrier Operating Conditionssupporting

confidence: 83%

“…Several fluid dynamic tests (Residence Time Distribution) were performed in the reactor and the results show that the gas flow has a plug flow behavior with axial diffusion [22]. In addition, Peclet number [36] (i.e., ratio of convective transport and diffusive one) is, in the worst case scenario, higher than 30, meaning that convection transport is predominant.…”

Section: D-unsteady Simulation Of the Reaction In The Fixed Bed Reactormentioning

confidence: 99%

“…These cycles were carried out in a fixed bed reactor previously described in the literature [22]. The oxygen carrier was placed inside a quartz tubular reactor (6 mm inner diameter).…”

Section: Experimental Set-upmentioning

confidence: 99%

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Numerical Modeling of Oxygen Carrier Performances (NiO/NiAl2O4) for Chemical-Looping Combustion

Blas¹,

Dutournié

Jeguirim

et al. 2017

Energies

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Abstract:This work was devoted to study experimentally and numerically the oxygen carrier (NiO/NiAl 2 O 4 ) performances for Chemical-Looping Combustion applications. Various kinetic models including Shrinking Core, Nucleation Growth and Modified Volumetric models were investigated in a one-dimensional approach to simulate the reactive mass transfer in a fixed bed reactor. The preliminary numerical results indicated that these models are unable to fit well the fuel breakthrough curves. Therefore, the oxygen carrier was characterized after several operations using Scanning Electronic Microscopy (SEM) coupled with equipped with an energy dispersive X-ray spectrometer (EDX). These analyses showed a layer rich in nickel on particle surface. Below this layer, to a depth of about 10 µm, the material was low in nickel, being the consequence of nickel migration. From these observations, two reactive sites were proposed relative to the layer rich in nickel (particle surface) and the bulk material, respectively. Then, a numerical model, taking into account of both reactive sites, was able to fit well fuel breakthrough curves for all the studied operating conditions. The extracted kinetic parameters showed that the fuel oxidation was fully controlled by the reaction and the effect of temperature was not significant in the tested operating conditions range.

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Section: Reactor and Oxygen Carrier Operating Conditionssupporting

confidence: 83%

Section: D-unsteady Simulation Of the Reaction In The Fixed Bed Reactormentioning

confidence: 99%

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Numerical Modeling of Oxygen Carrier Performances (NiO/NiAl2O4) for Chemical-Looping Combustion

Blas¹,

Dutournié

Jeguirim

et al. 2017

Energies

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“…Gayán et al [7] The stability of the nickel aluminate binder used in CLC is a very important parameter to ensure good mechanical strength of the oxygen carrier, and so, limit particles agglomeration and fragmentation which could damage the CLC process. In previous work [43], we studied the reactivity of the NiAl 2 O 4 binder by performing oxidation/reduction cycles in a fixed bed reactor with CO as fuel. The major observation was that the binder underwent a structural modification, which modified its reactivity.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability study of NiAl2O4 binders for Chemical Looping Combustion application

Blas

Dutournié

Dorge³

et al. 2016

Fuel

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The influence of the preparation method of NiAl 2 O 4 binders on their thermal stability was studied. For this purpose, the reactivity of two different NiAl 2 O 4 binders with CO as fuel was studied in a fixed bed reactor device. Successive oxidation-reduction cycles were performed-2/19-on the two binders to study their reactivity with the fuel and their structural modifications as cycles proceed. Results reveal that binders are not inert in reducing atmosphere; they both react with the fuel to produce CO 2. The total reduction capacity (TRC) of the first binder (B1, synthetized by pyrolytic pulverization) increases during the first cycles and levels off after 20 cycles. However, the TRC of the second binder (B2, synthetized by calcination of a mixture of Ni(OH) and γ-Al 2 O 3), increases progressively and reaches a maximum after 80 cycles. The growing amount of available oxygen in the binders leads both binders to structural modifications. X-Ray Diffraction studies performed on fresh and aged binders presented a shift of the peaks related to NiAl 2 O 4. Moreover, quantitative X-Ray Diffraction studies and Temperature Programmed Reduction measurements were performed in order to quantify the NiO present in each binder before and after oxidation-reduction cycles. These experiments revealed the presence of NiO in fresh binders due to the preparation method, and an increase of this amount after oxidation-reduction cycles. Therefore, NiAl 2 O 4 in the binder is progressively decomposed producing NiO and Al 2 O 3. Finally, the decomposition of the binder NiAl 2 O 4 as cycles proceed was also observed in studies performed on the oxygen carrier NiO/NiAl 2 O 4. This work showed that the binder reacts with the fuel and therefore it can contribute to the modification of the oxygen carrier reactivity.

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“…The aim of the work presented in the fifth paper, entitled ''Study of the performances of an oxygen carrier: experimental investigation of the binder's contribution and characterization of its structural modifications'' [6] was to investigate the binder's (NiAl 2 O 4 ) contribution to the performances of an oxygen carrier NiO/ NiAl 2 O 4 . Indeed, experimental tests performed with this oxygen carrier showed that the reduction capacity can be higher than the amount of oxygen available on the nickel oxide.…”

mentioning

confidence: 99%

International Chemical Engineering Congress 2013: From fundamentals to applied chemistry and biochemistry

Jeguirim

Limousy

2014

Comptes Rendus. Chimie

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Study of the performances of an oxygen carrier: Experimental investigation of the binder's contribution and characterization of its structural modifications

Cited by 7 publications

References 45 publications

Numerical Modeling of Oxygen Carrier Performances (NiO/NiAl2O4) for Chemical-Looping Combustion

Numerical Modeling of Oxygen Carrier Performances (NiO/NiAl2O4) for Chemical-Looping Combustion

Thermal stability study of NiAl2O4 binders for Chemical Looping Combustion application

International Chemical Engineering Congress 2013: From fundamentals to applied chemistry and biochemistry

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