Hierarchical modeling of solid oxide cells and stacks producing syngas via H2O/CO2 Co-electrolysis for industrial applications

Banerjee, Aayan; Wang, Yuqing; Diercks, Justus S.; Deutschmann, Olaf

doi:10.1016/j.apenergy.2018.08.122

Cited by 73 publications

(48 citation statements)

References 67 publications

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“…The popularity of steady-state models could translate the early development stage of most CO2 transformation technologies which are still not commercial. This would suggest algae production [206][207][208][209][210][211], CO2 hydrogenation to methanol [212] and SOEC [213] are promising CO2 transformation technologies since they are being optimized in dynamic mode and take into consideration operational disturbances. Nevertheless, very few of these models were validated in dynamic mode [207,211,212].…”

Section: Current Status Of Modelling Co2 Transformation Technologiesmentioning

confidence: 99%

“…It was observed from Table 4 that very limited studies carried out process optimisation [208,212,213,215]. Most studies performed process analysis at system or component level by varying operating parameters, for example, temperature, pressure, flowrate and feed composition to evaluate their effects on the conversion and production efficiency.…”

Section: Process Analysis and Process Optimisationmentioning

confidence: 99%

See 1 more Smart Citation

Transformation technologies for CO2 utilisation: Current status, challenges and future prospects

Kamkeng

Wang

et al. 2021

Chemical Engineering Journal

293

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Section: Current Status Of Modelling Co2 Transformation Technologiesmentioning

confidence: 99%

Section: Process Analysis and Process Optimisationmentioning

confidence: 99%

Transformation technologies for CO2 utilisation: Current status, challenges and future prospects

Kamkeng

Wang

et al. 2021

Chemical Engineering Journal

293

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“…The appropriate heat demand can be supplied from external sources or, in the case of power-to-methane, from the exothermal methanation process that can be operated at temperatures of 250-700 • C (Götz et al, 2016;Rönsch et al, 2016). Additionally, SOEL technology provides the ability to perform co-electrolysis of H 2 O and CO 2 , thus allowing for the generation of a suitable syngas composition for the downstream methanation process (Banerjee et al, 2018;Biswas et al, 2020). These synergies allow to significantly increase the overall system efficiencies by a high thermal integration of the electrolysis and the methanation process (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Techno-Economic Assessment of Thermally Integrated Co-Electrolysis and Methanation for Industrial Closed Carbon Cycles

2021

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Energy-intensive industries still produce high amounts of non-renewable CO2 emissions. These emissions cannot easily be fully omitted in the short- and mid-term by electrification or switching to renewable energy carriers, as they either are of inevitable origin (e.g., mineral carbon in cement production) or require a long-term transition of well-established process chains (e.g., metal ore reduction). Therefore, carbon capture and utilization (CCU) has been widely discussed as an option to reduce net CO2 emissions. In this context, the production of synthetic natural gas (SNG) through power-to-methane (PtM) process is expected to possess considerable value in future energy systems. Considering current low-temperature electrolysis technologies that exhibit electric efficiencies of 60–70%el, LHV and methanation with a caloric efficiency of 82.5%LHV, the conventional PtM route is inefficient. However, overall efficiencies of >80%el, LHV could be achieved using co-electrolysis of steam and CO2 in combination with thermal integration of waste heat from methanation. The present study investigates the techno-economic performance of such a thermally integrated system in the context of different application scenarios that allow for the establishment of a closed carbon cycle. Considering potential technological learning and scaling effects, the assessments reveal that compared to that of decoupled low-temperature systems, SNG generation cost of <10 c€/kWh could be achieved. Additional benefits arise from the direct utilization of by-products oxygen in the investigated processes. With the ability to integrate renewable electricity sources such as wind or solar power in addition to grid supply, the system can also provide grid balancing services while minimizing operational costs. Therefore, the implementation of highly-efficient power-to-gas systems for CCU applications is identified as a valuable option to reduce net carbon emissions for hard-to-abate sectors. However, for mid-term economic viability over fossils intensifying of regulatory measures (e.g., CO2 prices) and the intense use of synergies is considered mandatory.

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“…Up to this point, only steam and hydrogen were supplied to the fuel channels, so that thermocatalytic surface chemistry did not occur. Next, a symmetric gas mixture containing 25 % H 2 O/25 % H 2 /25 % CO 2 /25 % CO was considered, so that the rSOC stack firstly produced syngas via co‐electrolysis below TNV at 1.3 V, and then provided electrical power in fuel cell mode at 0.7 V. In this case, individual potential balances at the electrode‐electrolyte interfaces are set up for the two electrochemical H 2 O and CO 2 evolution/reduction pathways . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The simulation code is part of the DETCHEM software package . A detailed description of the applied model and the computational procedure was previously reported and can be found elsewhere .…”

Section: Model Descriptionmentioning

confidence: 99%

Dynamic Modeling of Reversible Solid Oxide Cells

Wehrle

Wang

Banerjee

et al. 2019

Chemie Ingenieur Technik

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Reversible solid oxide cells (rSOCs) are highly efficient devices, which allow either the generation of electric power or the storage of energy via fuel production. In this paper, the characteristics of the mode switch are investigated by applying a dynamic 3D stack model. The responses of temperature, current density, and species mole fractions regarding a switch from storage (SOEC) to generation mode (SOFC) are examined in detail. Additionally, the impact of using excess air and continuous voltage variations to limit temperature gradients and fluctuations during the mode switch are analyzed.

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Hierarchical modeling of solid oxide cells and stacks producing syngas via H2O/CO2 Co-electrolysis for industrial applications

Cited by 73 publications

References 67 publications

Transformation technologies for CO2 utilisation: Current status, challenges and future prospects

Transformation technologies for CO2 utilisation: Current status, challenges and future prospects

Techno-Economic Assessment of Thermally Integrated Co-Electrolysis and Methanation for Industrial Closed Carbon Cycles

Dynamic Modeling of Reversible Solid Oxide Cells

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