Investigations on thermochemical energy storage based on technical grade manganese-iron oxide in a lab-scale packed bed reactor

Wokon, Michael; Kohzer, Andreas; Linder, Marc

doi:10.1016/j.solener.2017.05.034

Cited by 74 publications

(51 citation statements)

References 31 publications

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“…However, agglomeration and particle stability problems occur after a number of redox reactions of (Mn 0.75 Fe 0.25 ) 2 O 3 granules in a packed bed reactor. [34] Under chemical looping conditions, similar problems with manganese-iron-oxide particles in a fluidized bed reactor have been reported. [43] A reactor concept with moving particles, such as a reactor with a moving bed or a fluidized bed, induces even greater stress on the particles than a packed bed.…”

Section: Introductionmentioning

confidence: 71%

“…A stoichiometric weight change caused by the redox reaction of 3.340 to 3.378 % with the Mn‐cation content (Mn/Mn+Fe) x between 0 and 1 can theoretically be achieved. However, agglomeration and particle stability problems occur after a number of redox reactions of (Mn 0.75 Fe 0.25 ) 2 O 3 granules in a packed bed reactor . Under chemical looping conditions, similar problems with manganese‐iron‐oxide particles in a fluidized bed reactor have been reported .…”

Section: Introductionmentioning

confidence: 99%

“…So far, solar receivers for the reduction of metal oxide particles by direct solar radiation apply rotary kiln,, gravity‐driven particle receivers, or packed bed reactors . A fluidized bed reactor and packed bed reactors, were investigated for reactors that are able to oxidize metal oxide particles and extract heat to a working fluid. A further development of the packed bed to a moving bed as a reactor concept for continuous heat extraction combines two main advantages.…”

Section: Introductionmentioning

confidence: 99%

“…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 . In contrast, in the thermochemical storage concept, the reduction in O 2 ‐depleted air and oxidation in air are initiated thermally by exceeding the equilibrium temperature or by changing the partial pressure of O 2 under isothermal conditions . Particle size may vary depending on the applied reactor concept.…”

Section: Introductionmentioning

confidence: 99%

“…[2] In contrast, in the thermochemical storage concept, the reduction in O 2depleted air and oxidation in air are initiated thermally by exceeding the equilibrium temperature or by changing the partial pressure of O 2 under isothermal conditions. [34] Particle size may vary depending on the applied reactor concept. For these reasons, it remains uncertain if the findings from particle stability investigations under chemical-looping conditions can be applied to thermochemical storage applications.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Preisner¹,

Block²,

Linder³

et al. 2018

Energy Tech

View full text Add to dashboard Cite

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Reticulated Porous Perovskite Structures for Thermochemical Solar Energy Storage

Pein

Matzel

Oliveira

et al. 2022

Advanced Energy Materials

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In contrast to photovoltaics and wind turbines where solar/wind energy is converted directly to electrical power needing immediate supply to the grid, heat can be stored for long periods and supplied on demand. Through this inherent capability, CSP plants can play a crucial role on our transition from our current fossil fuels-based energy system to one based to a large extent on fluctuating power from renewable energy sources, being able to supply cost-effective, baseload and peak-load electricity and stabilizing the power grids. The approach set forth herein is targeted on increasing the storage density of air-operated CSP plants by hybridizing sensible with thermochemical storage of solar heat within the same storage unit volume, through the exploitation of reversible reduction-oxidation reactions of air in direct contact with porous ceramic structures made entirely of earth-abundant, inexpensive, nontoxic metal oxides. This approach is entirely compatible with the "modularity" and thus straightforward scalability of current state-of-the-art regenerative sensible heat storage/recovery systems that are manufactured from similar, yet chemically inert inexpensive porous structures like bricks and honeycombs.Historically, coupling redox (reduction-oxidation) chemistries operating on the transition between the oxidized (MeO x ) and the reduced state (MeO x-δ ) of a metal oxide exhibiting multiple The inherent capability of concentrated solar power (CSP) plants for sensible thermal energy storage ensures their continuous operation and is considered their most crucial competitive edge versus other renewable energy sources. The storage density of air-operated CSP plants can be significantly increased by hybridizing sensible with thermochemical storage of solar heat, exploiting reversible air-solid oxide reduction-oxidation reactions. Thermochemical storage-relevant-protocols testing of in-house manufactured lab-scale reticulated porous ceramic foams made entirely of CaMnO 3 perovskite reveals fully reversible reduction-oxidation in up to 46 cycles between 300 and 1100 °C under air, without any deterioration of the foams' structural integrity and exploitable endothermic/exothermic heat effects between 890 and 920 °C linked to an orthorhombic-to-cubic phase transition. Dilatometry experiments with CaMnO 3 bars under identical cyclic conditions demonstrate the correlation of this phase transition to an increase in the thermal expansion coefficient but nevertheless, complete recovery of the initial specimen dimensions upon completion of a full heat-up/cooldown redox cycle. The possibility of shaping into sturdy reticulated porous ceramic structures which exhibit complete dimensional reversibility upon cyclic redox operation, combined with the low cost, earth abundance and environmentally benign character of the constituting elements, render such perovskite compositions extremely attractive for the manufacture of large-scale porous structured objects for exploitation in various thermochemical processes.

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Iron as Recyclable Metal Fuel: Unraveling Oxidation Behavior and Cyclization Effects Through Thermogravimetric Analysis, Wide‐Angle X‐ray Scattering and Mössbauer Spectroscopy

Kuhn,

Knapp,

Deutschmann

et al. 2024

ChemSusChem

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The carbon‐free chemical storage and release of renewable energy is an important task to drastically reduce CO2 emissions. The high specific energy density of iron and its recyclability makes it a promising storage material. Energy release by oxidation with air can be realized by the combustion of micron‐sized iron powders in retro‐fitted coal fired power plants and in fixed‐bed reactors under milder conditions. An experimental parameter study of iron powder oxidation with air was conducted based on thermogravimetric analysis in combination with wide‐angle X‐ray scattering and Mössbauer spectroscopy. In agreement with literature the oxidation was found to consist of a very fast initial oxidation of the outer particle layer followed by much slower oxidation due to diffusion of iron ions through the Fe2O3/Fe3O4 layer being the ratelimiting step. Scanning electron microscopy analysis of the iron particle before and after oxidation reveal a strong particle morphology transformation. This impact on the reaction was studied by cyclization experiments. Up to 10 oxidation‐reduction cycles show that both, oxidation and reduction rates, increase strongly with cycling due to increased porosity.

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Investigations on thermochemical energy storage based on technical grade manganese-iron oxide in a lab-scale packed bed reactor

Cited by 74 publications

References 31 publications

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

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

Reticulated Porous Perovskite Structures for Thermochemical Solar Energy Storage

Iron as Recyclable Metal Fuel: Unraveling Oxidation Behavior and Cyclization Effects Through Thermogravimetric Analysis, Wide‐Angle X‐ray Scattering and Mössbauer Spectroscopy

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