Modeling and performance optimization of a solid oxide electrolysis system for hydrogen production

AlZahrani, Abdullah A.; Dinçer, İbrahim

doi:10.1016/j.apenergy.2018.04.124

Cited by 83 publications

(21 citation statements)

References 41 publications

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“…12,[14][15][16] Various schemes of syngas supply (including water gas, ammonia and urea, biomass, and coal gas) are also investigated to evaluate the syngas conversion in SOFCs and SOECs. [17][18][19][20][21][22] Most work is focused on the system level without considering multiphysics transport processes coupled with chemical or electrochemical reactions at the cell or electrode level.…”

Section: The Scheme Of the Gas Supply In Dual-modementioning

confidence: 99%

“…This observation indicates that the electrochemical reaction and water‐gas shift (WGS) reaction occur simultaneously in the fuel electrode with syngas . Various schemes of syngas supply (including water gas, ammonia and urea, biomass, and coal gas) are also investigated to evaluate the syngas conversion in SOFCs and SOECs . Most work is focused on the system level without considering multiphysics transport processes coupled with chemical or electrochemical reactions at the cell or electrode level.…”

Section: Introductionmentioning

confidence: 99%

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CFD modeling and performance comparison of solid oxide fuel cell and electrolysis cell fueled with syngas

et al. 2018

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Summary Reversible solid oxide fuel cells (rSOFCs) may be applied to store and generate electrical energy in a reversible mode. This technique is promising to balance the conflict between intermittent power supply and demand in a sustainable way. One of the limitations of the development of rSOFCs is the high cost of storage and usage of pure H2, which may be solved by employing syngas as the fuel. The performance of rSOFCs depends on the development of bifunctional materials, cell design, and operation optimization, which are often investigated and predicted by the cost‐effective approach of mathematical modeling. However, the modeling of dual‐mode rSOFCs involving co‐redox reactions with syngas is not well developed. In this study, a two‐dimensional (2D) single‐channel model of an rSOFC is developed. The novelty of this model is that the multiphysics transport processes are fully coupled and solved with the reversible water‐gas shift reaction with syngas and the electrochemical reactions. The effects of the operating conditions and design parameters (eg, electrode thickness) are considered, with the aim of providing guidelines to optimize the design and operation of reversible cells. It is concluded that the thickness of the electrode has a larger impact on the water‐gas shift reaction than on the electrochemical reaction in both the gas diffusion and reaction regions. The C/H element ratio of syngas has a negative correlation with power output, but the distributions of current and gas species may be improved in both modes. A higher operating temperature improves the performance in both modes but has a more substantial effect in the electrolysis mode. The specific design and operating schemes favored in different modes should be balanced in the reversible mode.

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Section: The Scheme Of the Gas Supply In Dual-modementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CFD modeling and performance comparison of solid oxide fuel cell and electrolysis cell fueled with syngas

et al. 2018

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“…In the thermal analysis of the hydrogen production system, less published studies were related to the conventional exergy analysis. AlZahrani et al [26] made an assessment of the thermodynamic performance of an HTSE system in both exothermic and endothermic modes by exergy analysis. However, conventional exergy analysis merely gives the amount of exergy destruction while it has no significance in the improvement of the system performance.…”

Section: Introductionmentioning

confidence: 99%

Assessment of thermodynamic performance of a 20 kW high‐temperature electrolysis system using advanced exergy analysis

Xiao

Guan

et al. 2021

Fuel Cells

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The thermal efficiency of the high-temperature solid oxide electrolysis cell system for steam electrolysis has drawn extensive concern in the energy conversion field. This work presents a thermodynamic investigation of a high-temperature steam electrolysis system by conventional and advanced exergy analyses. A steady-state simulation of a 20 kW high-temperature steam electrolysis system is performed for system performance analysis. The thermal inefficiency of each component in the system is revealed by conventional exergy analysis. The predictions show the system exergy efficiency is 49.98%, H 2 -compressor has the largest exergy destruction (6773.6 W, 39.16% of the total exergy destruction). Through advanced exergy analysis, the impacts of the interactions among components and the technical limitation with each component are considered. The results indicate the H 2 -compressor has the highest exergy saving potential owing to the largest avoidable exergy destruction (1935 W), followed by the stack and vapor generator. Thus, the solid oxide electrolysis cell stack, H 2 -compressor, and vapor generator have tremendous potential in energy conservation. Advanced exergy analysis also indicates the interactions among components have less influence on the exergy destruction which means most measures toward improving hightemperature steam electrolysis systems should be taken to improving each component itself rather than interconnections among components.

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“…The anode and cathode concentration voltage losses (V conc,an and V conc,ca ) are presented for OSOFC and HSOFC. 39 OSOFC:…”

mentioning

confidence: 99%

“…where P H 2 ,an and P H 2 O,an are the partial pressures of hydrogen gas and steam at the anode side, respectively, and P O 2 ,ca is the partial pressure of oxygen gas at the cathode side. P TPB H 2 ,an , P TPB H 2 O,an , and P TPB O 2 ,ca are the partial pressures of hydrogen, steam, and oxygen at the three-phase boundary, 39 respectively, which can be expressed as follows:…”

mentioning

confidence: 99%

Combined systems based on OSOFC/HSOFC: Comparative analysis and multi‐objective optimization of power and emission

Mojaver

Khalilarya

Chitsaz

2020

Intl J of Energy Research

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An integrated system, including a biomass gasifier, a solid oxide fuel cell, heat pipes, and an organic Rankine cycle, was modeled and validated. The system performance was assessed in two different cases based on: (a) oxygen-ion conducting electrolyte and (b) proton-conducting electrolyte solid oxide fuel cells. At low current densities, the system based on proton-conducting electrolyte cell presented larger values of power. In contrast, the system based on oxygenion conducting electrolyte cell had a better performance from power viewpoint at high current densities. This phenomenon was similar for energy and exergy efficiencies and emission. The comparative analysis revealed that the system based on oxygen-ion conducting electrolyte cell had higher power output than the system based on proton-conducting electrolyte cell (204.2 kW against 178.7 kW) at their optimum conditions, while the system based on protonconducting electrolyte cell presented lower emission (996.5 kg/MW h against 1560.7 kg/MW h). The TOPSIS method was utilized to solve the multi-criteria decision-making problem. The results indicated that the system based on proton-conducting electrolyte cell had a better performance than the system based on oxygen-ion conducting electrolyte cell.

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Modeling and performance optimization of a solid oxide electrolysis system for hydrogen production

Cited by 83 publications

References 41 publications

CFD modeling and performance comparison of solid oxide fuel cell and electrolysis cell fueled with syngas

CFD modeling and performance comparison of solid oxide fuel cell and electrolysis cell fueled with syngas

Assessment of thermodynamic performance of a 20 kW high‐temperature electrolysis system using advanced exergy analysis

Combined systems based on OSOFC/HSOFC: Comparative analysis and multi‐objective optimization of power and emission

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