Optimization of a hybrid solar-fossil fuel plant: Solar steam reforming of methane in a combined cycle

Sheu, Elysia J.; Mitsos, Alexander

doi:10.1016/j.energy.2013.01.027

Cited by 53 publications

(20 citation statements)

References 11 publications

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“…There has been much work on the solar reformer system, but less so on the hybrid system analyses. Moreover, while there have been many studies on steam/dry reformers (either system level or specific reformer component studies) [11,12,13,14,15,16,3,17], there has not been as much work done on redox reformers. For specifically redox type reformers, there has been an experimental study on a solar reformer combines Zn production methane reforming [18].…”

Section: + H 2 O(v) → Mo + H 2 (Exothermic or Endothermic)mentioning

confidence: 99%

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Redox reforming based, integrated solar-natural gas plants: Reforming and thermodynamic cycle efficiency

Sheu

Ghoniem

2014

International Journal of Hydrogen Energy

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As demand for energy continues to rise, the concern over the increase in emissions grows, prompting much interest in using renewable energy resources such as solar energy. However, there are numerous issues with using solar energy including intermittancy and the need for storage. A potential solution is the concept of hybrid solar-fossil fuel power generation. Previous work has shown that utilizing solar reforming in conventional power cycles has higher performance compared to other integration methods. Most previous studies have focused on steam or dry reforming and on specific component analysis rather than a systems level analysis. In this article, a system analysis of a hybrid cycle utilizing redox reforming is presented.Important cycle design and operation parameters such as the oxidation temperature and reformer operating pressure are identified and their effect on both the reformer and cycle performance is discussed. Simulation results show that increasing oxidation temperature can improve reformer and cycle efficiency. Also shown is that increasing the amount of reforming water leads to a higher reformer efficiency, but can be detrimental to cycle efficiency depending on how the reforming water is utilized.

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Section: + H 2 O(v) → Mo + H 2 (Exothermic or Endothermic)mentioning

confidence: 99%

“…Comparison among these different hybridization schemes has shown that solar reforming utilizes the solar energy more efficiently [3]. In addition, solar reforming is also a storage mechanism because it stores the solar energy in the form of a chemical fuel [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Redox reforming based, integrated solar-natural gas plants: Reforming and thermodynamic cycle efficiency

Sheu

Ghoniem

2014

International Journal of Hydrogen Energy

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“…With the hybrid operation, intermittency concerns are eliminated as fuel can be used when solar is not available, and in particular, when solar reforming is used as the hybridization method, a viable storage option is obtained through the use of solar fuels [2]. Moreover, analysis of solar reforming hybrid cycles has shown that the hybridization can improve the solar energy system performance [3].…”

Section: Introductionmentioning

confidence: 99%

“…System level studies have also been performed for steam and redox reformer hybrid cycles [2,3,18]. Specifically for the redox reformer hybrid cycle, the previous analysis done was for a reformer utilizing steam in the oxidation step [18].…”

Section: Introductionmentioning

confidence: 99%

Dry redox reforming hybrid power cycle: Performance analysis and comparison to steam redox reforming

Sheu

Mokheimer

Ghoniem

2015

International Journal of Hydrogen Energy

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There has been much interest in the use of renewable resources for power generation as the world's energy demand and the concern over the rise in emissions increases. In the near term, however, renewable sources such as solar energy are expected to provide a small fraction of the world's energy demand due to intermittancy and storage problems. A potential solution is the use of hybrid solar-fossil fuel power generation.Previous work has shown the potential of steam redox reforming for hybridization.However, this type of reforming requires some water consumption (which may be infeasible in certain locations) as not all the water can be recovered through recy-cling. An alternative is to utilize dry (or CO 2 ) redox reforming. In this paper, a system analysis for a CO 2 redox reforming hybrid cycle and comparison of cycle and reformer performance between a CO 2 redox reformer and steam redox reformer hybrid cycle are presented. The effect of important operating parameters such as pressure, amount of reforming CO 2 , and the oxidation temperature on the reformer and cycle performance are discussed. Simulation results show that increasing the oxidation temperature or the amount of reforming CO 2 leads to higher reformer and * Corresponding Author: ghoniem@mit.edu, Tel: +1 6172532295, Fax: +1 6172535981 Preprint submitted to International Journal of Hydrogen EnergyOctober 24, 2014 cycle efficiencies. In addition, the comparison between the CO 2 and steam redox reformer hybrid cycles shows that the CO 2 cycle has the potential to have better overall performance.

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“…Recently, solar reforming systems, such as methanol, methane, and natural gas, have been investigated [1][2][3][4][5][6][7]. We examine a system using the heat obtained from a small sunlight solar collector to reform bioethanol into a vapor FBSR (fuel cell system with bioethanol solar reforming system).…”

Section: Introductionmentioning

confidence: 99%

A simulation study of a bioethanol‐solar‐reforming system for proton‐exchange membrane fuel cell home cogeneration system

Obara

2014

Energy Science & Engineering

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The energy supply characteristic of a proton-exchange membrane fuel cell for houses is strongly influenced in a hydrogen supply unit. Therefore, a bioethanol reforming system (FBSR) with a sunlight heat source is developed as a potential fuel supply system for distributed fuel cells. However, the temperature distribution of a catalyst layer in the reactor is not stable under conditions of unstable solar radiation and unstable outside air temperature; as a result, it is thought that the inversion ratio (the percentage of hydrogen obtained from ethanol) of a reforming reaction will decrease. In this paper, heat transmission analysis was used in the catalyst layer of the reformer of FBSR, and the fundamental performance of FBSR was investigated. Fluctuations of the solar insolation over a short period of time affect the hydrogen-generating rate of FBSR. Moreover, the amount of hydrogen production of FBSR was simulated using meteorological data from a day in March and a day in August in a cold region (Sapporo in Japan). In this research, the relation between the collected area of a solar collector and the energy supply to an individual house was obtained.

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Optimization of a hybrid solar-fossil fuel plant: Solar steam reforming of methane in a combined cycle

Cited by 53 publications

References 11 publications

Redox reforming based, integrated solar-natural gas plants: Reforming and thermodynamic cycle efficiency

Redox reforming based, integrated solar-natural gas plants: Reforming and thermodynamic cycle efficiency

Dry redox reforming hybrid power cycle: Performance analysis and comparison to steam redox reforming

A simulation study of a bioethanol‐solar‐reforming system for proton‐exchange membrane fuel cell home cogeneration system

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