Numerical study on a two-stage Metal Hydride Hydrogen Compression system

Gkanas, Evangelos I.; Grant, David M.; Stuart, Alastair D.; Eastwick, Carol; Book, D. L.; Nayebossadri, Shahrouz; Pickering, Lydia; Walker, Gavin S.

doi:10.1016/j.jallcom.2015.03.123

Cited by 33 publications

(22 citation statements)

References 26 publications

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“…The additional complexity in design of this application that two coupled MH reactors introduce warrants the use of a numerical model [7] in order to predict the overall compressor performance. Once validated, a numerical model will allow the timely optimization of specific system parameters and the incorporation of enhanced heat management techniques leading to the improvement of overall compressor performance.…”

Section: Fig 12 Please Insert Herementioning

confidence: 99%

“…Validation of the numerical model was achieved through comparing the model with the experimental work given in [7]. An electrical external oil heater with a maximum capacity of 27 kW is installed to emulate the "industrial process heat", and the heat transfer to the MH-compressor is facilitated by a heating oil loop using the commercially available oil THERMINOL®LT.…”

Section: Mass and Energy Balance During Multistage Reactor Couplingmentioning

confidence: 99%

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Metal hydride hydrogen compression: recent advances and future prospects

et al. 2016

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OF THE MANUSCRIPTMetal hydride (MH) thermal sorption compression is one of the more important applications of the metal hydrides. The present paper reviews recent advances in the field based on the analysis of the fundamental principles of this technology. The performances when boosting hydrogen pressure, along with two-and three-step compression units are analyzed. The paper includes also a theoretical modeling of a two-stage compressor aimed at both describing the performance of the experimentally studied systems, but, also, on their optimization and design of more advanced MH compressors. Business developments in the field are reviewed for the Norwegian company HYSTORSYS AS and the South African Institute for Advanced Materials Chemistry. Finally, future prospects are outlined presenting the role of the metal hydride compression in the overall development of the hydrogen driven energy systems. The work is based on the analysis of the development of the technology in Europe, USA and South Africa.

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confidence: 99%

Section: Mass and Energy Balance During Multistage Reactor Couplingmentioning

confidence: 99%

Metal hydride hydrogen compression: recent advances and future prospects

et al. 2016

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“…Recent research and development work focused on the design of high-pressure MH-based compression systems, examining the technical performance of the proposed material heat exchanger coupled solutions. Gkanas et al [5] propose the use of a two-stage metal hydride compression system to achieve maximum pressure ratios of 22, with a maximum delivery pressure of 320 bar at 130 • C. The first-stage material is an AB 5 alloy, namely LaNi 5 , while the second-stage material is an AB 2 -type material based on Zr-V-Mn-Nb. Karagiorgis et al [6] investigate the use of MH materials to compress hydrogen, using waste heat available at temperatures in the range 10-80 • C. Maximum compression ratios of about 32 were achieved, compressing hydrogen between 7 bar and 220 bar.…”

Section: Introductionmentioning

confidence: 99%

“…Karagiorgis et al [6] investigate the use of MH materials to compress hydrogen, using waste heat available at temperatures in the range 10-80 • C. Maximum compression ratios of about 32 were achieved, compressing hydrogen between 7 bar and 220 bar. However, the system is comprised of six-stage metal hydride compressors, using AB 5 and AB 2 materials. Galvis et al [7] also analyze the use of a three-stage MH compressor, comprised of AB 2 -type materials (Ti-Zr-Cr-Mn-V), to achieve an overall compression ratio of about 82.…”

Section: Introductionmentioning

confidence: 99%

Techno-Economic Analysis of High-Pressure Metal Hydride Compression Systems

Corgnale¹,

Sulic²

2018

Metals

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Traditional high-pressure mechanical compressors account for over half of the car station's cost, have insufficient reliability, and are not feasible for a large-scale fuel cell market. An alternative technology, employing a two-stage, hybrid system based on electrochemical and metal hydride compression technologies, represents an excellent alternative to conventional compressors. The high-pressure stage, operating at 100-875 bar, is based on a metal hydride thermal system. A techno-economic analysis of the metal hydride system is presented and discussed. A model of the metal hydride system was developed, integrating a lumped parameter mass and energy balance model with an economic model. A novel metal hydride heat exchanger configuration is also presented, based on minichannel heat transfer systems, allowing for effective high-pressure compression. Several metal hydrides were analyzed and screened, demonstrating that one selected material, namely (Ti 0.97 Zr 0.03 ) 1.1 Cr 1.6 Mn 0.4 , is likely the best candidate material to be employed for high-pressure compressors under the specific conditions. System efficiency and costs were assessed based on the properties of currently available materials at industrial levels. Results show that the system can reach pressures on the order of 875 bar with thermal power provided at approximately 150 • C. The system cost is comparable with the current mechanical compressors and can be reduced in several ways as discussed in the paper.

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“…In a previous work [31], the authors described the simulation study of the operation of a two-stage metal hydride hydrogen compression system and studied the combination of different materials. Heat management of the reactors did not go any further than identifying that both reactors had external jackets for the heating/cooling of the hydrides, as the main focus of the study was the understanding the operation of the coupled compressor stages.…”

Section: Introductionmentioning

confidence: 99%

Efficient hydrogen storage in up-scale metal hydride tanks as possible metal hydride compression agents equipped with aluminium extended surfaces

Gkanas

Grant

Khzouz

et al. 2016

International Journal of Hydrogen Energy

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The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractIn the current work, a three-dimensional computational study regarding coupled heat and mass transfer during both the hydrogenation and dehydrogenation process in upscale cylindrical metal hydride reactors is presented, analysed and optimized. Three different heat management scenarios were examined at the degree to which they provide improved system performance. The three scenarios were: 1) Plain embedded cooling/heating tubes, 2) transverse finned tubes and 3) longitudinal finned tubes. A detailed optimization study was presented leading to the selection of the optimized geometries. In addition, two different types of hydrides, LaNi5 and an AB2-type intermetallic were studied as possible candidate materials for using as the first stage alloys in a two-stage metal hydride hydrogen compression system. As extracted from the above results, it is clear that the case of using a vessel equipped with 16 longitudinal finned tubes is the most efficient way to enhance the hydrogenation kinetics when using both LaNi5 and the AB2-alloy as the hydride agents. When using LaNi5 as the operating hydride the case of the vessel equipped with 60 embedded cooling tubes presents the same kinetic behaviour with the case of the vessel equipped with 12 longitudinal finned tubes, so in that way, by using extended surfaces to enhance the heat exchange can reduce the total number of tubes from 60 to 12. For the case of using the AB2-type material as the operating hydride the performance of the extended surfaces is more dominant and more effective comparing to the case of using the embedded tubes, especially for the case of the longitudinal extended surfaces.

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Numerical study on a two-stage Metal Hydride Hydrogen Compression system

Cited by 33 publications

References 26 publications

Metal hydride hydrogen compression: recent advances and future prospects

Metal hydride hydrogen compression: recent advances and future prospects

Techno-Economic Analysis of High-Pressure Metal Hydride Compression Systems

Efficient hydrogen storage in up-scale metal hydride tanks as possible metal hydride compression agents equipped with aluminium extended surfaces

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