Thermal and mechanical behaviour of oxygen carrier materials for chemical looping combustion in a packed bed reactor

Jacobs, Marijke; Noyen, Jasper Van; Larring, Yngve; McCann, Michael; Pishahang, Mehdi; Amini, Shahriar; Ortiz, Modesto; Galluci, F.; Sint-Annaland, M.V.; Tournigant, D.; Louradour, E.; Snijkers, Frans

doi:10.1016/j.apenergy.2015.04.053

Cited by 19 publications

(15 citation statements)

References 23 publications

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“…In the IRoR model, pseudobrookite was considered to be Fe 2 O 3 + TiO 2 , whereas ilmenite was FeO + TiO 2 ,i nw hich TiO 2 was considered to be an inert material. Therefore,o nly Reactions (5), (7), and (9) were considered, in which Fe 2 O 3 included all ferric materials and FeOi ncluded the ferrous materials.…”

Section: Methodsmentioning

confidence: 99%

“…[25] Because the determination of the changei n the effective diffusion coefficient is out of the scope of this work, as impled ependency of D on the solid conversion was assumed,a sa lso used previously to describe other gas-solid reactions, [26,27] and also other oxygen-carrier reduction and oxidationr eactions. [28] This dependency is included in Equation (7) with the factor containing k x ,w hich is as olid diffusion decay constant. Thek inetic parameters were obtained by fitting the equation parameters of Equation (5) to the experimental data by using alinear least squares method.…”

Section: Kinetic Modelmentioning

confidence: 99%

“…In packed-bed CLC,r elativelyl arge oxygen-carrier particle sizes need to be used to avoid av ery large pressure drop over the beds.T hese particles will be subjectt os evere conditions of temperature (gradients) and pressure.T he material has to cope with mechanical forces due to thermal and chemical expansion. [7] It can be expected that these conditions will introduce changes to the structural, physical, and chemical properties of the oxygen-carrier particles. From am echanical point of view,t he material must be strong enough to support its own weight, also after several (thousands of) cycles.I ft he particlesd isintegrate due to poor mechanical strength, the pressured rop over the bed will increase dramatically,j eopardizing the overall performance of the reactor.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the Reactions Prevailing during Packed‐Bed Chemical Looping Combustion of Syngas using Ilmenite

et al. 2016

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Chemical looping combustion has been identified as a very promising technology for power production with integrated carbon dioxide capture. The objective of this work is to study the kinetics of all reactions that are important in the combustion of syngas in a packed‐bed chemical looping reactor by using ilmenite as an oxygen carrier. The reaction kinetics of reduction, with hydrogen and carbon monoxide, and oxidation, with oxygen, of ilmenite‐based pellets have been determined in a thermogravimetric analyzer. The shrinking core model for a spherical geometry was used to obtain the kinetic parameters by considering mixed control by chemical reactions and diffusion through the product layer for all reaction involved. The reduction rate of ilmenite by hydrogen was at least an order of magnitude higher than that by carbon monoxide (especially at higher particle conversions) and the activation energies were found to be 45 and 30 kJ mol−1 for reduction with hydrogen and carbon monoxide, respectively. For the oxidation reaction, a much lower apparent activation energy of 5 kJ mol−1 was found, which indicated that the temperature did not have an important effect on the oxidation kinetics of ilmenite. In addition, the catalytic activity of ilmenite for water gas shift (WGS) was measured in a micro fixed‐bed reactor. An empirical power‐law model was used to describe the kinetics of the WGS reaction over ilmenite.

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Section: Methodsmentioning

confidence: 99%

Section: Kinetic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetics of the Reactions Prevailing during Packed‐Bed Chemical Looping Combustion of Syngas using Ilmenite

et al. 2016

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“…Particle stability and the modification of metal oxides have been comprehensively investigated by the chemical‐looping research community ,. However, operation conditions and applied reactor concepts differ between chemical‐looping and thermochemical storage applications.…”

Section: Introductionmentioning

confidence: 99%

“…Particle stability and the modification of metal oxides have been comprehensively investigated by the chemicallooping research community. [46,[53][54][55] However, operation conditions and applied reactor concepts differ between chemicallooping and thermochemical storage applications. In CLC, isothermal reaction conditions are mainly applied in O 2 depleted air for the oxidation of metal oxides, and a fuel atmosphere for the reduction of metal oxides.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing Particles of Manganese‐Iron Oxide with Additives for Thermochemical Energy Storage

Preisner¹,

Block²,

Linder³

et al. 2018

Energy Tech

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Manganese‐iron oxide particles are a promising candidate for both chemical‐looping combustion (CLC) and thermochemical energy storage. In CLC, the ability of metal oxides to oxidize fuels in an oxygen‐free atmosphere and re‐oxidize in air is addressed. Whereas, reaction enthalpy is the main focus of thermochemical energy storage for, e. g. concentrated solar power or an industrial process that requires high temperature levels. Sufficient mechanical strength of the particles while they endure chemical, thermal, or mechanical stress is a crucial factor for both concepts. Particle stability is investigated here by adding 20 wt.% of TiO2, ZrO2, or CeO2 as a supportive material to (Mn0.7Fe0.3)2O3. Thermal cyclization and temperature shock tests are conducted in a packed bed reactor to identify chemical stability as well as the effect of chemical and thermal stress. A subsequent particle size distribution analysis is performed to determine the relevant breakage mechanism. Attrition resistance is tested with a customized attrition jet cup to estimate the mechanical strength of particles. It is found that the high tendency of unsupported manganese‐iron oxide particles towards agglomeration can be improved with any of the chosen additives. The particles with CeO2, and especially with ZrO2, as an additive indicate an increase in resistance towards attrition. However, adding TiO2 has a severe negative impact on the chemical reactivity of the manganese‐iron oxide.

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Chemical Looping Processes Using Packed Bed Reactors

Spallina

Gallucci

Annaland

2018

Handbook of Chemical Looping Technology

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Thermal and mechanical behaviour of oxygen carrier materials for chemical looping combustion in a packed bed reactor

Cited by 19 publications

References 23 publications

Kinetics of the Reactions Prevailing during Packed‐Bed Chemical Looping Combustion of Syngas using Ilmenite

Kinetics of the Reactions Prevailing during Packed‐Bed Chemical Looping Combustion of Syngas using Ilmenite

Stabilizing Particles of Manganese‐Iron Oxide with Additives for Thermochemical Energy Storage

Chemical Looping Processes Using Packed Bed Reactors

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