DSpace Repository :: Browsing by Subject "HIDROGENO"

Browsing by Subject "HIDROGENO"

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Análisis de prefactibilidad de una planta productora de hidrógeno
(2020) Crozzoli, Piero; Gullo, Francisco; Milanesi, Julieta; Sánchez Barros, Agustina; Trivellini, Luciano; Mascarenhas, Juan Martín
"El presente documento tiene como propósito el análisis de prefactibilidad del desarrollo y puesta en marcha de una planta productora de hidrógeno verde. Producido mediante electrólisis y alimentado por fuentes renovables, se presenta como una alternativa ecológica para la generación y almacenamiento de energía renovable, siendo un pilar fundamental para la descarbonización y la sustentabilidad mundial."
Catalytic cleaning process for high pressure electrolyzers
(2017) Dijk, Nicolás van; Jordan, Thomas; Grune, Joachim
"The on growing global energy demand and the increasing need to reduce greenhouse gas emissions in order to avoid the worst case scenarios of global warming, forces to introduce cleaner and more sustainable technologies and practices into all sector of the economy. Therefore, electricity produced by renewable sources is continuously increasing in the energy matrix worldwide. One drawback of the renewable energies is the generation intermittency. This issue positions hydrogen as one of the main characters to store the surplus energy and blend the uctuations by producing and storing it at high pressure. Hydrogen can be produced by splitting water using an electrolyzer. Moreover, in order to increase the power-to-gas eficiency, high pressure electrolyzer are being developed. Gas cross contamination in high pressure electrolyzers is a burden that needs to be tackled in Gas order to avoid unwanted ignition events. Therefore, a cleaning process needs to be implemented. In this master thesis a catalytic cleaning process is tested with an existent experimental set up. Tests are performed with pressures up to 90 bar and the behavior of the catalytic material is assessed. Results show v 10% efciency increase with pressure increase along the pressure range tested. It is found that pressure range is bounded due to experimental set-up limitations and modifications to the test facility are proposed."
CFD simulation of a hydrogen explosion experiment in an ISO container
(2017) Weber, Philipp; Schulenberg, Thomas; Jordan, Thomas; Kotchourko, Alexei
"The EU project HySEA is dedicated to explosion risk reduction by deflagration venting of industrial hydrogen installations. In 20-foot ISO containers, several experiments have been conducted to provide data for combustion model improvement and validation. The first experimental campaign included a blindprediction study concerning two lean premixed configurations. The hydrogen research group of IKET submitted a model prediction based on the in-house code COM3D. The experimental results were not matched. Therefore, the objective of this thesis was to improve the predictability of the CFD code by carrying out post-blind simulations. Over the course of this work, the roles of thermodiffusive instability and the turbulent flame speed model in the process of flame acceleration were analyzed and clarified. As a consequence, the numerical model for the transition from laminar to turbulent flame speed was developed and implemented in the COM3D code. Validating simulations demonstrated satisfactory agreement compared to the experimental results. This represents a first step toward extending the applicability of the code to a wider range of combustion scenarios."
Estudio de la expansión de hidruros metálicos
(2018) Adorno, Ramiro; Cosentino, Santiago; Lauretta, Juan Ricardo
"El presente trabajo tiene como objetivo estudiar la expansión volumétrica del hidruro metálico desde una perspectiva beneficiosa, como una fuente generadora de fuerza y trabajo. Durante el presente informe se presentará la metodología experimental utilizada para erogar la fuerza y el trabajo generado durante el proceso de expansión volumétrica de dicho metal por la absorción de hidrógeno"
Experimental determination of single bubble behavior in a high-pressure optical alkaline electrolyzer
(2017) Estruga, Pablo José María; Jordan, Thomas
"The participation of renewable energy in the energetic matrix is increasing continuously and the electrical energy storage technologies will be crucial in the future energy sector scenario. With this technologies, it is possible to regulate the fluctuating electrical energy generation that renewable energy sources present. Under the “Power to gas” concept, hydrogen can be generated with the surplus of those sources (e.g. solar and wind power). Thus, it is essential to increase the efficiency of the storage technologies. The generation of hydrogen by means of high pressure electrolysis is presented as a possible solution. This master thesis was done within the cooperation program between the Institute of Nuclear and Energy Technologies (IKET) and the Instituto Tecnológico de Buenos Aires (ITBA). Experiments were performed with an alkaline high-pressure experimental electrolyzer, where pressure was rise up to 180bar. It was studied the case of single bubbles behavior, focusing on the typical diameters and rise velocities of hydrogen and oxygen bubbles. The obtained results were compared with a bubbles swarm behavior, where clear differences were observed. To achieve the single bubble generation, a new electrode was design and an electrical pulsed signals was applied as power supply."
Experimental set-up for bubble behaviour in a high pressure alkaline electrolyte
(2016) Frey, Félix; Jordan, Thomas; Orbaiz, Pedro
"The increase in the proportion of renewable energy in the energy matrix and associated unpredictable electricity surpluses, the need for efficient forms of energy storage raises. Due to high energy density and transportability, hydrogen plays an important role as energy storage. After the production of hydrogen by electrolysis a significant percentage of the stored energy is used for the compression of the hydrogen gas. Higher efficiencies are reached by high pressure electrolysis, because subsequently compression of the hydrogen gas is not necessary. In the course of a cooperation between the Institute of Nuclear and Energy Technologies (IKET) and the Instituto Tecnológico de Buenos Aires (ITBA), a high pressure elec-trolyser Experiment has been developed at ITBA. The particularity about this device besides the high working pressure, are glass windows in the taps in order to be able to analyse the behaviour of the gas bubbles. Experiments for the investigation of the bubble behaviour have been performed at IKET. This master thesis describes the development of the project, from the design and construction of the electrolyser at ITBA, to the execution of first series of experiments at IKET. First conclusions about the bubble behaviour are presented".
Feasibility study of hydrogen fueled internal combustion hybrid bus operating under real traffic urban conditions in Buenos Aires, Argentina
(2018-12-18) Britz, Sven; Orbaiz, Pedro
"This thesis evaluates the technical, economic and environmental performance of a hydrogen fueled hybrid bus, which uses an internal combustion engine as a power unit. Results are compared to those of a conventional diesel bus and to those of two commercially available hydrogen fuel cell buses. The performance of the different vehicles, under real driving conditions, is evaluated using validated models of these on the Autonomie simulation platform. On the other hand, the life-cycle GHG emissions of the buses are estimated with hydrogen being produced from different primary sources. Whilst the first scenario assumes that hydrogen is produced from natural gas via steam methane reforming, the other three assumes electrolytic production using different electricity production mixes. Finally the total cost of ownership of each hybrid bus is calculated and compared to that of the conventional bus. Results show that all hydrogen buses have a considerable lower energy consumption than that of the conventional vehicle. This is manly due to the use of the hybrid powertrain architecture. When comparing the different hydrogen buses, as expected, the fuel cell vehicles result in a higher efficiency than the internal combustion engine vehicles, but in a considerable higher cost, making the use of internal combustion engines a more cost effective way to reduce GHG emissions. The life cycle emission analysis shows that the environmental performance of all hydrogen vehicles is highly dependent on the carbon intensity of the hydrogen production. Overall, whilst fuel cells are more efficient than ICEs, the considerable lower cost of ICEs makes the H2ICE hybrid bus a more cost effective way of reducing GHG emissions."
H2 purity control of high-pressure alkaline electrolyzers
(2021-06) David, Martín Rafael; Bianchi, Fernando D.; Ocampo-Martínez, Carlos; Sánchez-Peña, Ricardo
"This paper proposes a control strategy that mitigates the cross contamination of H2 and O2 in a high-pressure alkaline electrolyzer, which consequently increases the supplied gases purity. In order to reduce the diffusion of gases through the membrane, the controller establishes the opening of two outlet valves based on the pressure of the system and the difference in liquid level between both separation chambers. Therefore, a multiple input - multiple output optimal controller is designed here. For this purpose, an available high-fidelity model was simplified in order to obtain a control-oriented model. The proposed controller was evaluated in simulation using the high-fidelity nonlinear model in a wide operating range and was compared with a pair of decoupled PI controllers. The resulting impurity of gases was below 1% in all cases."
Sistemas eólicos de generación de energía con almacenamiento en hidrógeno: análisis de la tecnología y perspectiva de mercado en la Argentina
(2008) Tuccillo, Julián I.; Lauretta, Juan Ricardo
"En el trabajo se expone el concepto de generación distribuida de energía con sistemas que combinan aerogeneración y producción de hidrógeno mediante electrólisis de agua. Se estudia el dimensionamiento óptimo de estos sistemas, y su implementación en la Argentina en términos de factibilidad tecnológica y económico-financiera. Para dicho análisis se proyectan tres posibles modelos de negocio, pensando en un usuario o grupo de usuarios responsables de la propia generación de energía. A los fines de resolver las cuestiones de análisis, se desarrolla un modelo matemático de optimización que contempla los beneficios financieros sujetos a las restricciones de mercado, de inversión en recursos y a la demanda satisfecha. El modelo se construye en el programa MS Excel, y pretende ser una herramienta versátil para la toma de decisiones frente a las cambiantes situaciones tecnológicas y de mercado que se presenten a lo largo del tiempo. Finalmente, como conclusión se discuten las perspectivas de inserción tecnológica de estas energías renovables de la mano de un cambio cultural global."
Use of energy surplus from local renewable sources, to produce electrolytic hydrogen for electricity generation at isolated places in Argentina
(2018-09-17) Oettinger, Sebastián Federico; De Bernardez, Leopoldo
"The aim of this project is to study the use of energy surplus from local renewable sources at isolated places in Argentina, to produce electrolytical hydrogen as clean fuel for electricity generation. Furthermore, the hydrogen production is seen as a storage technology to attenuate intermittent power supplies to microgrids. Significant knowledge, concerning Hydrogen production, storage and combustión, is available in Argentina at lab-prototype stage. Although experimental research is still required, this work is an approach to the utilization of the existing technology. Mostly, micro-grids depend on expensive energy generation, as gas turbines or diesel engines that have to work out of their optimal operating point. As case study, it is considered the city of Río Grande, placed at the province of Tierra del Fuego in Argentina, because it is not connected to the national grid and shows excellent wind conditions. Together with Río Grande, there are other micro-grids in the region, which could benefit from the incorporation of energy storage technologies and rely on renewable energy. The analysis of Río Grande’s energy situation, as well as the potential use of wind energy and Hydrogen storage, have shown synergies to reduce energy costs and emissions. Although a general solution was not reached, a scenario is shown in which the hydrogen production and the storage capacity are optimal to offer insight into the problematic and serve as reference for further investigations."
Wind energy in Argentine Patagonia: shortening the distance between the source and the consumers
(2019-08) Greco Coppi, Martín Nicolás; Nietsch, Thomas
"This work presents a holistic analysis of the utilization of the wind source in Argentine Patagonia, focusing on the problem of the distance between this resource and the sinks. Even though the possibility of utilizing the wind energy locally is studied, the resource is so big that bulk energy transport methods are fundamental to properly profit from it. Four methods for transporting bulk long distance energy from wind parks in the Argentine Patagonian to the sources of big demand, i.e. big cities, are analyzed. The results show that high voltage direct current lines are the cheapest solution for the transport problem. Other solutions involving hydrogen also appear very interesting for utilizing Patagonian wind energy. Especially if the future conditions evolve favorable to hydrogen technologies, injecting hydrogen in natural gas pipelines in the short term, constructing hydrogen pipelines for the mid term and shipping liquid hydrogen for exportation in the long term, would prove profitable. All the analyzed methods would generate a reduction in greenhouse gas emissions and provide earnings to Argentina in exchange currency."

Browsing by Subject "HIDROGENO"

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