Hydrogen Production

Voitic, Gernot; Pichler, Birgit Elvira; Basile, Angelo; Iulianelli, Adolfo; Malli, Karin; Bock, Sebastian; Hacker, Viktor

doi:10.1016/b978-0-12-811459-9.00010-4

Cited by 21 publications

(15 citation statements)

References 53 publications

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“…Steam reforming of gaseous hydrocarbons is perceived as an efficient method to supply fuel for fuel cells. However, it is costlier to assemble, a well-rounded steam methane reforming can generate hydrogen cost-efficiently than auto thermal reforming [19], [20]. The demerits of steam reforming are it decreases carbon dioxide emanations, eradicates carbon monoxide emissions in contrast to flaring of conventional fuels because of amplified efficiency as well as fuel cell features and it may be exorbitant at lesser proportions required for fuel cells [18].…”

Section: Co + H2o Co2 + H2mentioning

confidence: 99%

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Modelling Production of Renewable Energy from Water Splitting High Thermal Electrolysis Processes

Ebuehi

Abhulimen

Adebesin

2021

EJERS

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Recently, fuel gas from water has become the center of attention because it is a renewable source of energy and eco-friendly. In this study, the hydrogen gas simulated was obtained from the high-temperature water splitting electrolysis model, because it is more efficient than the low-temperature water splitting electrolysis process. It also releases oxygen as a byproduct. The high-temperature electrolysis model is made up of three loops: primary high-temperature helium loop, secondary helium loop, and high-temperature electrolysis loop. Hydrogen gave a temperature of 27.20C, a pressure of 49.5 bars, and a molar flow of 84.02MMSCFD. The hydrogen gas from a high-temperature electrolysis model is simulated with a CO2 gas stream to produce methane and water, also releasing unreacted carbon dioxide and hydrogen. Key parameters such as molar entropy, molar enthalpy, heat flow, and cost flow were evaluated by Aspen HYSYS V8.8. The simulation model used for this work is the Sabatier Process Model. In this model, Continuous stirred tank, Converter, Equilibrium, Gibbs, Plug flow reactors were used to generate methane. The Converter reactor gave the highest yield of methane gas with a mole fraction of 0.2390. Key benchmarks, including temperature, heat flow, cost flow, cost factor were varied to see how they can affect methane gas and other products.

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Section: Co + H2o Co2 + H2mentioning

confidence: 99%

“…Voitic et al [19] debated the need to use hydrogen as a fuel for transport and power generation. They established new technologies for efficient production of hydrogen, removal of impurities, and separation processes.…”

Section: Literature Reviewmentioning

confidence: 99%

Modelling Production of Renewable Energy from Water Splitting High Thermal Electrolysis Processes

Ebuehi

Abhulimen

Adebesin

2021

EJERS

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“…In this paper, a case study for a pipeline with a nominal pressure of 40 bar and recompression after a pressure drop of 20 bar is conducted. H 2 is generated at pressure levels between 1 -80 bar [5]. The pipeline pressure is in a range between 30 bar to 100 bar [6] and hence an initial pressurisation after generation can be necessary.…”

Section: Introductionmentioning

confidence: 99%

Challenges of compressing hydrogen for pipeline transportation with centrifugal-compressors

Schuster¹,

Dohmen²,

Brillert³

2020

Proceedings of Global Power &Amp; Propulsion Society

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In this paper, the challenges of compressing hydrogen (H 2) for transportation mainly in pipelines utilizing centrifugalcompressors are outlined. The focus is on a continuously increasing H 2 fraction in existing natural gas pipeline networks. Thereby, this paper raises consciousness for a new research area. Based on basic thermodynamic analysis, mean-line and computational fluid dynamics (CFD), the challenges and required measures to reach pressure ratios in a single-stage similar to compressors for heavier gas molecules are highlighted. Furthermore, all results are compared to CH 4. Increasing the rotational speed or, at least partially, using counter rotating rotors emerges as possible solutions. Thereby, an economically implementation is possible and brings H 2 one step closer to a storage option for energy converted from renewable sources. As a case study, a singlestage centrifugal-compressor for re-compression in pipelines is designed and analysed with 3D CFD. The operation of the compressor in conjunction with the pipeline is investigated. In conclusion, a pipeline equipped with centrifugal-compressors using variable speed control can deliver constant heating power for pure CH 4 and pure H 2. To achieve the required circumferential speeds, advanced materials are necessary and future research and development activities have to focus on the application of such materials to centrifugal-compressors. NOMENCLATURE a Speed of sound c Velocity in stationary frame cr Counter rotating rotor h Enthalpy ∆h s Isentropic enthalpy change ∆h stg Actual enthalpy change in a stage M Molar mass p Pressure R m Universal molar gas constant T Temperature u Circumferential velocity v spec. volume w Velocity in relative frame w t Work γ Isentropic exponent φ i Volume fraction of component i ϕ Through-flow coefficient ψ h Enthalpy coefficient

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“…Furthermore, the growing interest in hydrogen is due to its potentiality in solving two major challenges: achieving the energy independence while minimizing the environmental impact. Unfortunately, there are four critical aspects needing development before hydrogen economy could be realistically pursued [8]:…”

Section: Introductionmentioning

confidence: 99%

“…the environmental impact. Unfortunately, there are four critical aspects needing development before hydrogen economy could be realistically pursued [8]:…”

mentioning

confidence: 99%

Progress in Modeling of Silica-Based Membranes and Membrane Reactors for Hydrogen Production and Purification

2019

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Hydrogen is seen as the new energy carrier for sustainable energy systems of the future. Meanwhile, proton exchange membrane fuel cell (PEMFC) stacks are considered the most promising alternative to the internal combustion engines for a number of transportation applications. Nevertheless, PEMFCs need high-grade hydrogen, which is difficultly stored and transported. To solve these issues, generating hydrogen using membrane reactor (MR) systems has gained great attention. In recent years, the role of silica membranes and MRs for hydrogen production and separation attracted particular interest, and a consistent literature is addressed in this field. Although most of the scientific publications focus on silica MRs from an experimental point of view, this review describes the progress done in the last two decades in terms of the theoretical approach to simulate silica MR performances in the field of hydrogen generation. Furthermore, future trends and current challenges about silica membrane and MR applications are also discussed.

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Hydrogen Production

Cited by 21 publications

References 53 publications

Modelling Production of Renewable Energy from Water Splitting High Thermal Electrolysis Processes

Modelling Production of Renewable Energy from Water Splitting High Thermal Electrolysis Processes

Challenges of compressing hydrogen for pipeline transportation with centrifugal-compressors

Progress in Modeling of Silica-Based Membranes and Membrane Reactors for Hydrogen Production and Purification

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