Influence of the regeneration conditions on the performances and the microstructure modifications of NiO/NiAl 2 O 4 for chemical looping combustion

Blas, Lucia; Dorge, Sophie; Michelin, Laure; Dutournié, Patrick; Lambert, Arnold; Chiche, David; Bertholin, Stéphane

doi:10.1016/j.fuel.2015.03.015

Cited by 18 publications

(9 citation statements)

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“…As previously observed [14], the binder can, in some cases, increase the global reactivity of the oxygen carrier. Indeed, the amount of metal oxide (NiO in this study) increases as operation proceeds (separation of the NiAl 2 O 4 phase to NiO and Al 2 O 3 ).…”

Section: Introductionsupporting

confidence: 68%

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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: Introductionsupporting

confidence: 68%

“…Moreover, a light grey layer covers the aged particles ( Figure 6). Previous investigations (SEM, XRD) have shown that this layer is rich in nickel [14], probably due to the migration of nickel to the particles' surface as cycles are performed.…”

Section: Reactor and Oxygen Carrier Operating Conditionsmentioning

confidence: 94%

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

Blas¹,

Dutournié

Jeguirim

et al. 2017

Energies

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“…Several oxidation-reduction cycles were performed on all materials in a fixed bed reactor device described in previous work [44], [45]. The binder was placed in a quartz reactor with an inner diameter of 6 mm.…”

Section: Experimental Set-upmentioning

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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“…Chemical looping combustion (CLC), initially proposed by Ritcher and Knoche, is an indirect two-step combustion technology with inherent separation of CO 2 from N 2 (see Figure ). CLC is a pre-commercialization technology, but experimental tests and simulation studies on its integration with power plants indicate that it has the potential to be more efficient than all other CO 2 capture technologies. − …”

Section: Introductionmentioning

confidence: 99%

CO₂ Capture with Chemical Looping Combustion of Gaseous Fuels: An Overview

et al. 2017

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The world-wide consumption of natural gas (NG) and other fossil fuels (e.g., coal and crude oil) is ever increasing. However, most CO 2 resulting from either NG combustion or other processes is released into the atmosphere without capture. Chemical looping combustion (CLC) is a two-step combustion technology for power and heat generation with inherent CO 2 capture, using either gaseous fuels or solid and liquid fuels. A previous review focused on CLC of solid fuels or CLC of all types of fuels but did not give an in-depth and specific discussion of gaseous fuel CLC systems. China is one of the largest consumers of NG, coal, and crude oil in the world, and it is essential to develop an alternative technology to take the place of gaseous fuel (e.g., NG) combustion. This Review summarizes recent research and development work on CLC using gaseous fuels, including a technological and economic assessment, types of oxygen carriers (OCs), reactor types, coke formation and OCs poisoning, efficiency and exergy analyses, and model development based on a literature survey. The plant efficiency of NG-CLC can be up to 52−60% (LHV), including CO 2 compression, based on calculations and simulations, which is about 3−5% more efficient than a NG combined cycle with CO 2 capture. Ni-based materials have been widely developed and applied for NG-CLC because of its fast kinetics for methane conversion. CuO−Cu 2 O/Cu, Mn 3 O 4 −MnO, and Fe 2 O 3 −Fe 3 O 4 are typical OCs with high selectivity toward CO 2 and H 2 O. The operating conditions are closely dependent on reactor configurations, hydrodynamics, mass and heat balances, and characteristics of the OCs in the system. CLC and other CO 2 capture technologies are also compared in the present Review, which has rarely been investigated previously. From simulation and process analysis, a conceptual design of a NG-CLC power plant of thermal input 655 MW th is conducted to clarify its technological advantages and economic benefits compared to other power generation processes. The air reactor, fuel reactor, and OCs do not impose significant economic barriers for scale-up and commercialization of CLC.

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Influence of the regeneration conditions on the performances and the microstructure modifications of NiO/NiAl 2 O 4 for chemical looping combustion

Cited by 18 publications

References 62 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

CO₂ Capture with Chemical Looping Combustion of Gaseous Fuels: An Overview

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Influence of the regeneration conditions on the performances and the microstructure modifications of NiO/NiAl 2 O 4 for chemical looping combustion

Cited by 18 publications

References 62 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

CO2 Capture with Chemical Looping Combustion of Gaseous Fuels: An Overview

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CO₂ Capture with Chemical Looping Combustion of Gaseous Fuels: An Overview