Browsing by Author "Sánchez-Laínez, Javier"
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Item Enabling the injection of hydrogen in high-pressure gas grids: Investigation of the impact on materials and equipment(2024-01-02) Sánchez-Laínez, Javier; Cerezo, Alberto; Storch de Gracia, Ma Dolores; Aragón, Jorge; Fernandez, Ekain; Madina, Virginia; Gil, Vanesa; TECNOLOGÍA DE MEMBRANAS E INTENSIFICACIÓN DE PROCESOS; TECNOLOGÍAS DE HIDRÓGENO; MATERIALES PARA CONDICIONES EXTREMASGreen hydrogen is a renewable gas that can help to reach the goal of decarbonizing the energy sector. The use of the natural gas grid for seasonal storage and transport of hydrogen needs previous assessment of its tolerance, ensuring safe and viable operation. In this work, the tolerance of the most typical material pipelines and key elements of high-pressure gas grids to the transport of 20 mol% hydrogen blends at 80 barg has been investigated at pilot scale. For this, the experimental campaign carried out at a testing platform replicating a high-pressure gas grid lasted 3000 h. The tightness of different kind of valves led to hydrogen losses below 1 Nml·h−1. No embrittlement or other kind of damage was found on these valves or the different parts of the equipment (regulator, flowmeter) tested. C-ring, 4pb and CT-WOL specimens have been prepared from carbon steel pipes (API5L Gr X42 to X70), showing no damage after exposure to hydrogen. H2/CH4 deblending has also been successfully achieved using Pd-based membrane technology, obtaining a high-purity separated streams.Item Green Preparation of Thin Films of Polybenzimidazole on Flat and Hollow Fiber Supports: Application to Hydrogen Separation(2021-02-05) Sánchez-Laínez, Javier; Etxeberria-Benavides, Miren; David, Oana; Téllez, Carlos; Coronas, Joaquín; TECNOLOGÍA DE MEMBRANAS E INTENSIFICACIÓN DE PROCESOSThis work shows the preparation of thin films, with thickness from 70 nm to 1 μm, of meta-polybenzimidazole (m-PBI) on polyimide P84 supports. Ethanolic solutions of m-PBI were used to coat flat and hollow fiber supports of asymmetric P84 with m-PBI in a process where the coating and drying was performed at room temperature. A solution of NaOH in EtOH allowed the dissolution of the m-PBI powder, providing the perfect coating solution to build thin films of m-PBI without damaging the polymeric support. It also meant a green alternative, avoiding the use of toxic solvents, such as dimethylacetamide. The resulting membranes have been tested for the separation of H2 mixtures at high temperature at different setups to allow checking their reproducibility. With 100 nm thickness the membranes showed their best gas separation performance. For flat membranes at 180 °C and 3 bar feed pressure a H2 permeance of 48.5 GPU was obtained, with respective H2/CO2 and H2/N2 selectivities of 33.3 and 55.8. Besides, the hollow fibers under a feed pressure of 6 bar and tested at the same temperature showed near 90 GPU of H2 with a H2/CO2 selectivity of 13.5 in the one-fiber module and over 39 GPU of H2 with a H2/CO2 selectivity of 20.2 in the five-fiber module. Finally, the stability of the membranes was proved for 22 days at 180 °C.Item INJECTION OF HYDROGEN INTO HIGH PRESSURE NATURAL GAS GRIDS: INVESTIGATION OF THE IMPACT ON MATERIALS AND EQUIPMENT AT RELEVANT ENVIRONMENT(International Association for Hydrogen Energy, IAHE, 2022) Gil, Vanesa; Sánchez-Laínez, Javier; Cerezo-Alarcón, Alberto; de Gracia, María Dolores Storch; Fernandez, Ekain; Madina, Virginia; Dincer, Ibrahim; Colpan, Can Ozgur; Ezan, Mehmet Akif; TECNOLOGÍAS DE HIDRÓGENO; MATERIALES PARA CONDICIONES EXTREMASThis work addresses the potential of hydrogen injection into the transmission high pressure natural gas grid as way to decarbonise the gas system and gas uses. To achieve this potential, knowledge gaps have to be covered considering the current know-how on how different concentrations of hydrogen gas could affect the infrastructure and its components. The activities are developed within the frame of HIGGS (FCH 2JU funded project, No. 875091). An R&D platform working at high pressure has been developed in HIGGS to achieve advance the knowledge on operation of hydrogen admixtures in the high-pressure natural gas grid, simulating the operational conditions from selected equipment, gas quality, etc. The admixture levels consider various hydrogen concentrations until reaching pure hydrogen. So far, the impact of H2/NG blends with up to 20 %vol H2 on steels and equipment has been studied through a mechanical and chemical characterization after been exposed to the blend. Membrane technology has also been tested for hydrogen recovery, using a Pd-based membrane prototype installed in the platform.