Dynamic modelling of an oxygen mixed conducting membrane and model reduction for control

Colombo, Konrad Eichhorn; Imsland, Lars; Bolland, Olav; Hovland, Svein

doi:10.1016/j.memsci.2009.02.035

Cited by 13 publications

(4 citation statements)

References 37 publications

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“…[20][21][22] The strong temperature and oxygen activity dependence of the transport properties of different mixed conductors, does not allow for a material independent model of the electrochemical and thermomechanical behaviour of an oxygen membrane. 23 In the present study we consider the possibility of using Ce 0.9 Gd 0.1 O 1.95-d (CGO10) as an OPM at high temperatures, where the electronic conductivity of doped ceria becomes too large for use of the material as an electrolyte in a solid oxide fuel cell required to deliver power at high efficiency. 2 A dynamic model of an OPM monolith, based on energy and mass conservation, was recently published for the case of La 2 NiO 4þd .…”

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confidence: 99%

“…2 A dynamic model of an OPM monolith, based on energy and mass conservation, was recently published for the case of La 2 NiO 4þd . 23 In the present study we consider the possibility of using Ce 0.9 Gd 0.1 O 1.95-d (CGO10) as an OPM at high temperatures, where the electronic conductivity of doped ceria becomes too large for use of the material as an electrolyte in a solid oxide fuel cell required to deliver power at high efficiency.…”

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confidence: 99%

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Oxygen Permeation in Thin, Dense Ce0.9Gd0.1O1.95-δ Membranes I. Model Study

Chatzichristodoulou

Søgaard

Hendriksen

2011

J. Electrochem. Soc.

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A model of a supported planar Ce 0.9 Gd 0.1 O 1.95-d oxygen membrane in a plug-flow setup was constructed and a sensitivity analysis of its performance under varying operating conditions and membrane parameters was performed. The model takes into account the driving force losses at the catalysts at the feed and permeate side of the membrane, related to the gaseous oxygen reduction and fuel oxidation, respectively, as well as the gas conversion and gas diffusion resistances in the porous support structure at the permeate side. The temperature and oxygen activity dependence of the oxide ionic and electronic conductivity and the oxygen nonstoichiometry of Ce 0.9 Gd 0.1 O 1.95-d were described based on literature data. The performance of the membrane was characterised by the delivered oxygen flux and the membrane voltage. The dependence of the performance on the various membrane and operating parameters was analyzed by a separation of the various losses. The chemical expansion of Ce 0.9 Gd 0.1 O 1.95-d under operation was estimated from the calculated oxygen activity and nonstoichiometry profiles inside the membrane.

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confidence: 99%

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confidence: 99%

Oxygen Permeation in Thin, Dense Ce0.9Gd0.1O1.95-δ Membranes I. Model Study

Chatzichristodoulou

Søgaard

Hendriksen

2011

J. Electrochem. Soc.

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“…The time scales of the monolithic membrane modules and HXs were analyzed previously with respect to energy, mass, and species conservation, respectively. The temperature of the membrane modules reaches steady-state within minutes . The membrane reactor and pipes were assumed to be coated with a high-performance insulation material that prevents large heat losses.…”

Section: System Time Scalesmentioning

confidence: 99%

“…The temperature of the membrane modules reaches steady-state within minutes. 70 The membrane reactor and pipes were assumed to be coated with a high-performance insulation material that prevents large heat losses. Consequently, steady-state is reached after several hours.…”

Section: System Time Scalesmentioning

confidence: 99%

Simulation of an Oxygen Membrane-Based Gas Turbine Power Plant: Dynamic Regimes with Operational and Material Constraints

Colombo¹,

Хартон²,

Bolland³

2010

Energy Fuels

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This paper investigates the transient behavior of a natural gas-fired power plant for CO2 capture that incorporates mixed-conducting membranes for integrated air separation. The membranes are part of a reactor system that replaces the combustor in a conventional gas turbine power plant. A highly concentrated CO2 stream can then be produced. The membrane modules and heat exchangers in the membrane reactor were based on spatially distributed parameter models. For the turbomachinery components, performance maps were implemented. Operational and material constraints were emphasized to avoid process conditions that could lead to instability and extensive stresses. Two load-control strategies were considered for the power plant with a gas turbine operating at constant rotational speed. In the first load-control strategy, variable guide vanes in the gas turbine compressor were used to manipulate the mass flow of air entering the gas turbine compressor. This degree of freedom was used to control the turbine exit temperature. In the second load-control strategy, variable guide vanes were not used, and the turbine exit temperature was allowed to vary. For both load-control strategies, the mean solid-wall temperature of the membrane modules was maintained close to the design value. Simulation reveals that the membrane-based gas turbine power plant exhibits rather slow dynamics; fast load following was hence difficult while maintaining stable operation. Comparing the two load-control strategies, load reduction with variable air flow rate and controlled turbine exit temperature was found to be superior because of the considerably higher and faster load reduction capability, increased stability of the catalytic combustors in the membrane reactor, and higher power plant efficiencies.

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Modeling of steam permeation through the high temperature proton‐Conducting ceramic membranes

et al. 2018

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The BaCeO3‐based perovskite oxide can be applied as a steam‐permeable membrane due to their noticeable mixed oxygen ion and proton conducting properties. In this article, a transient model of the steam permeation through the BaCe0.9Y0.1O3‐δ perovskite membrane at elevated temperatures has been developed with the Poisson–Nernst–Planck equations for analyzing the steam permeation process, in which the distribution of charged defects in the membrane is carefully considered. The effects of the operating temperature, the membrane thickness, the steam partial pressure, and the electric potential difference between two membrane sides during the steam permeation have been simulated and discussed. The modeling results indicate there exists a maximum value of the spontaneous electric potential difference with the temperature rise and the external electric potential can obviously increase the steam flux. The model is validated using the experimental results from literature under steady state operational conditions. © 2018 American Institute of Chemical Engineers AIChE J, 65: 777–782, 2019

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Dynamic modelling of an oxygen mixed conducting membrane and model reduction for control

Cited by 13 publications

References 37 publications

Oxygen Permeation in Thin, Dense Ce0.9Gd0.1O1.95-δ Membranes I. Model Study

Oxygen Permeation in Thin, Dense Ce0.9Gd0.1O1.95-δ Membranes I. Model Study

Simulation of an Oxygen Membrane-Based Gas Turbine Power Plant: Dynamic Regimes with Operational and Material Constraints

Modeling of steam permeation through the high temperature proton‐Conducting ceramic membranes

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