Exergy analysis of an integrated solid oxide electrolysis cell-methanation reactor for renewable energy storage

Luo, Yu; Wu, Xiao‐Yu; Ghoniem, Ahmed F.; Cai, Ningsheng

doi:10.1016/j.apenergy.2018.02.022

Cited by 69 publications

(36 citation statements)

References 41 publications

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“…Jensen et al found that P2M using pressurized SOECs can offer a storage cost of approximately 3 ￠ kW −1 h −1 , which is comparable to pumped hydroenergy and better than other storage technologies. Additionally, P2M using SOECs can integrate H 2 O/CO 2 coelectrolysis and methanation into one compact reactor, in which the heat released from methanation can be utilized in situ by the endothermic electrolysis process . As a result, SOECs have a lower thermal neutral voltage (TNV) when used for direct P2M.…”

Section: Introductionmentioning

confidence: 99%

“…Thermodynamic analysis reveals that pressurization is also beneficial for improving the efficiency of P2M using SOECs . However, direct P2M using a pressurized tubular SOEC was only studied using numerical simulation . In this study, we built a pressurized tubular SOEC test setup to experimentally demonstrate direct P2M in pressurized operation.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, P2M using SOECs can integrate H 2 O/CO 2 coelectrolysis and methanation into one compact reactor, in which the heat released from methanation can be utilized in situ by the endothermic electrolysis process. [11][12][13] As a result, SOECs have a lower thermal neutral voltage (TNV) when used for direct P2M. The TNV is considered an optimal operating voltage from the perspective of thermal management.…”

Section: Introductionmentioning

confidence: 99%

“…11 However, direct P2M using a pressurized tubular SOEC was only studied using numerical simulation. 5,12,13,22 In this study, we built a pressurized tubular SOEC test setup to experimentally demonstrate direct P2M in pressurized operation. To improve the overall efficiency and economic feasibility, we fed an inlet gas stream containing reduced H 2 content into our self-designed test setup to achieve high-yield methane production.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pressurized tubular solid oxide H₂O/CO₂ coelectrolysis cell for direct power‐to‐methane

Luo

Chen

et al. 2020

AIChE Journal

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To improve the energy‐to‐CH4 efficiency and enhance renewable power utilization, we investigate direct Power‐to‐Methane at low inlet H2 content (25 vol%) in solid oxide electrolysis cell (SOEC). The synergy of the pressurized operation and the electricity input effectively enhances CH4 yield by one‐order of magnitude from 2.8% to 28.7% and the CO2‐to‐CH4 ratio from 4.4% to 39.5% in the H2‐reduced case, where the ratio of H2 consumption to total energy consumption decreases to 41% and the energy‐to‐CH4 efficiency increases to 53%. We develop a multiphysics tubular SOEC model to understand the intrinsic coupling between electrochemistry and heterogeneous catalytic chemistry. From the perspective of performance enhancement, geometry optimization, and thermal design, inhibiting CH4 production in the inlet gas‐controlled zone and promoting CH4 production synergistically in both the electrochemistry‐controlled zone and the temperature‐controlled zone is the key to improve the energy‐to‐CH4 efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pressurized tubular solid oxide H₂O/CO₂ coelectrolysis cell for direct power‐to‐methane

Luo

Chen

et al. 2020

AIChE Journal

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“…Reference [27] investigated the impacts of recirculation rate and steam utilization on HTE system efficiency based on a previously validated simulation model of a reversible solid oxide cell plant. Reference [28] performed a simulation-based steady-state analysis of the overall thermal-to-hydrogen efficiency and the overall syngas production efficiency of an HTE system coupled with a nuclear reactor.Reference [29] evaluated the exergy efficiency of a simulated HTE system, and also discussed its dependence on operating conditions such as feedstock composition ratio, operating pressure, temperature and steam flow rate. Reference [30] employed a multi-objective optimization framework to maximize the system efficiency of an HTE simulation model, and depicted the correlation between the optimal efficiency and the current density, pressure, anode/cathode feed rates, etc.…”

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confidence: 99%

Optimization of hydrogen yield of a high-temperature electrolysis system with coordinated temperature and feed factors at various loading conditions: A model-based study

et al. 2018

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High-temperature electrolysis (HTE) is a promising technology for achieving high-efficiency power-to-gas, which mitigates the renewable curtailment while promoting decarbonization by transforming wind or solar energy into fuels. Different from low-temperature electrolysis, a considerable amount of the input energy is consumed by auxiliary equipment in an HTE system for maintaining the temperature, so the studies on systematic energy description and parameter optimization of HTE are essentially required. A few published studies investigated HTE's systematic optimization based on simulation, yet there is not a commonly used analytical optimization model which is more suitable for integration with power grid. To fill in this blank, a concise analytical operation model is proposed in this paper to coordinate the necessary power consumptions of auxiliaries under various loading conditions of an HTE system. First, this paper develops a comprehensive energy flow model for an HTE system based on the fundamentals extracted from the existing work, providing a quantitative description of the impacts of condition parameters, including the temperature and the feedstock flow rates. A concise operation model is then analytically proposed to search for the optimal operating states that maximize the hydrogen yield while meeting the desired system loading power by coordinating the temperature, the feedstock flows and the electrolysis current. The evaluation of system performance and the consideration of constraints caused by energy balances and necessary stack requirements are both included. In addition, analytical optimality conditions are obtained to locate the optimal operating states without performing nonlinear programming by further investigating the optimization method. In the case study, a numerical case of an HTE system is employed to validate the proposed operation model and optimization method, 1 arXiv:1810.06439v1 [physics.app-ph]

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Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Chen

Feldhoff

Weidenkaff

et al. 2021

Adv Funct Materials

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Mixed ionic-electronic conducting (MIEC) membranes have gained growing interest recently for various promising environmental and energy applications, such as H 2 and O 2 production, CO 2 reduction, O 2 and H 2 separation, CO 2 separation, membrane reactors for production of chemicals, cathode development for solid oxide fuel cells, solar-driven evaporation and energy-saving regeneration as well as electrolyzer cells for powerto-X technologies. The purpose of this roadmap, written by international specialists in their fields, is to present a snapshot of the state-of-the-art, and provide opinions on the future challenges and opportunities in this complex multidisciplinary research field. As the fundamentals of using MIEC membranes for various applications become increasingly challenging tasks, particularly in view of the growing interdisciplinary nature of this field, a better understanding of the underlying physical and chemical processes is also crucial to enable the career advancement of the next generation of researchers. As an integrated and combined article, it is hoped that this roadmap, covering all these aspects, will be informative to support further progress in academics as well as in the industry-oriented research toward commercialization of MIEC membranes for different applications.

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Exergy analysis of an integrated solid oxide electrolysis cell-methanation reactor for renewable energy storage

Cited by 69 publications

References 41 publications

Pressurized tubular solid oxide H₂O/CO₂ coelectrolysis cell for direct power‐to‐methane

Pressurized tubular solid oxide H₂O/CO₂ coelectrolysis cell for direct power‐to‐methane

Optimization of hydrogen yield of a high-temperature electrolysis system with coordinated temperature and feed factors at various loading conditions: A model-based study

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

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Exergy analysis of an integrated solid oxide electrolysis cell-methanation reactor for renewable energy storage

Cited by 69 publications

References 41 publications

Pressurized tubular solid oxide H2O/CO2 coelectrolysis cell for direct power‐to‐methane

Pressurized tubular solid oxide H2O/CO2 coelectrolysis cell for direct power‐to‐methane

Optimization of hydrogen yield of a high-temperature electrolysis system with coordinated temperature and feed factors at various loading conditions: A model-based study

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Contact Info

Product

Resources

About

Pressurized tubular solid oxide H₂O/CO₂ coelectrolysis cell for direct power‐to‐methane

Pressurized tubular solid oxide H₂O/CO₂ coelectrolysis cell for direct power‐to‐methane