Transient reversible solid oxide cell reactor operation – Experimentally validated modeling and analysis

Srikanth, Sneha; Heddrich, Marc P.; Gupta, Sanchit; Friedrich, K. Andreas

doi:10.1016/j.apenergy.2018.09.186

Cited by 47 publications

(26 citation statements)

References 44 publications

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“…Along the cell length, gas channels within the fuel electrode and air electrode compartment distribute the media in co-flow condition. More details about the stack configuration with modeling and experimental results of the temperature distribution along and across the stack and its repeating units can be found elsewhere [24][25][26]. During the experiments the oxygen electrodes of each stack were flushed with 1 slpm per cell air to prevent the accumulation of pure oxygen with its corrosive characteristic in the outlet pipes of the testing facility.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Long‐term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co‐electrolysis Mode

2020

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In this study three identically constructed ten-layer stacks with electrolyte supported cells were tested in exothermic steam and co-electrolysis mode at elevated pressures of 1.4 and 8 bar. Investigations during constant-current operation at a current density of-0.5 A cm-2 and a reactant conversion of 70% over 1,000-2,000 h were carried out. The inlet gas composition for steam electrolysis was 90/10 (H 2 O/H 2) and 63.7/31.3/3.3/1.7 (H 2 O/CO 2 /H 2 /CO) for co-electrolysis operation. All stacks showed highly similar resistances at the beginning of the tests indicating a high level of accuracy and repeatability during manufacturing. The stack operated in steam electrolysis mode at 1.4 bar showed comparably low degradation of 8 mV kh-1 cell-1 , whereas the stack operated at 8 bar showed an approximately four times higher degradation. The third stack was operated in co-electrolysis mode at 1.4 and 8 bar and showed noticeably higher degradation rates than during steam electrolysis mode. The predominant increase of the ohmic resistance during operation was identified to be mainly responsible for the observed degradation of all three stacks, whereas the increase of the polarization resistances played a subordinate role. Within the post-test analysis, noticeably high nickel depletion was observed for the stack operated at the highest pressure in steam electrolysis mode. Furthermore, partial delamination of electrodes was observed. The degradation is discussed with relation to phenomena and experimental parameters during operation.

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Section: Methodsmentioning

confidence: 99%

Investigation of the Long‐term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co‐electrolysis Mode

2020

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“…Ohmic loss accounts for the voltage drop due to resistance to charge transport [18], including the electric charge transport and the ionic current of O 2through the electrolyte layer. The resistance due to ions traveling through the electrolyte dominates the total ohmic loss, and the resistance for electrons to travel through the electrodes is neglected in our model [17].…”

Section: Iiiohmic Lossmentioning

confidence: 99%

“…They concluded that the overall cell performance can be improved by increasing the operating pressure or temperature. Based on a 1D transient reversible SOC model, Srikanth et al [18] proposed a strategy for the optimization of inlet work medium temperature to reduce the temperature variation rate during mode switching transient processes. Zheng et al [19] presented a 1D dynamic model of a tubular SOC in radius direction.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modeling and parameter analysis study on reversible solid oxide cells during mode switching transient processes

et al. 2020

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“…The chemical reactor models for methanation reactors were implemented assuming chemical equilibrium using the “RGIBBS” model in Aspen Plus. Finally, the validated 1‐D rSOC reactor model was used for system simulation, and for further details, refer to Srikanth et al . The 1‐D rSOC reactor models the global electrochemical reaction using the Butler–Volmer kinetic models.…”

Section: Process System Analysismentioning

confidence: 99%

“…showed that implementing a detailed reactor model, as compared with a 0‐D model, in process system simulations significantly altered the system performance and certain operation points were deemed unfeasible. This is especially critical for an rSOC system where the SOC reactor will have to function in both operation modes …”

Section: Introductionmentioning

confidence: 99%

Electricity Arbitration and Sector Coupling with an Experimentally Validated Reversible Solid Oxide Cell Reactor System Connected to the Natural Gas Grid

2020

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Chemical energy storage offers an attractive solution for the arbitration of intermittent renewable electricity due to its higher energy storage capacity and storage duration. Reversible solid oxide cell (rSOC) reactor systems can efficiently operate in electrolysis operation to convert electrical energy to chemical energy or in fuel cell mode to convert chemical energy back to electrical energy. Natural gas is widely used in the chemical industry as a source of energy and hydrogen. Hence, storing electrical energy in the form of synthetic natural gas can couple electricity arbitration with chemical process industries. A methane‐based rSOC system concept for the purpose of energy storage and sector coupling is investigated. A process system analysis is performed based on an experimental study of a commercially available rSOC reactor. A validated rSOC reactor model is used to identify optimal system operating conditions. The proposed system concept achieves a chemical to electrical energy conversion efficiency of 57% and electrical to chemical energy conversion efficiency of 93% based on first law and lower heating value. A net electrical storage efficiency of 53% can be achieved.

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Transient reversible solid oxide cell reactor operation – Experimentally validated modeling and analysis

Cited by 47 publications

References 44 publications

Investigation of the Long‐term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co‐electrolysis Mode

Investigation of the Long‐term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co‐electrolysis Mode

Dynamic modeling and parameter analysis study on reversible solid oxide cells during mode switching transient processes

Electricity Arbitration and Sector Coupling with an Experimentally Validated Reversible Solid Oxide Cell Reactor System Connected to the Natural Gas Grid

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