Publication of ESR 2 in the International Journal of Hydrogen Energy
ESR 2 at University of Seville, Antonio Escamilla Perejón, together with his supervisors, David Sánchez and Lourdes García-Rodríguez, have published a journal paper in the International Journal of Hydrogen Energy (IJHE), titled “Assessment of power-to-power renewable energy storage based on the smart integration of hydrogen and micro gas turbine technologies”.
Antonio is working on innovative energy storage concepts based on power-to-power solutions using micro-gas turbines. The current publication is aimed at the assessment of power-to-hydrogen-to-power (P2P) energy storage systems as an efficient means to reliably increase the share of renewable energies in the grid. In contrast with most of the works on P2P systems available in literature, focusing more on global techno-economic considerations and disregarding the fundamentals of the technology, the main goal of this analysis is to look into the thermodynamic principles of each process along the value-chain of hydrogen with the aim to characterise the energy balance of this energy storage option. This yields a much more accurate calculation of the round-trip efficiency, figure of merit usually adopted to compare the efficiency of energy storage systems. Additionally, the study is restrained to using micro-gas turbines as a means to produce power from hydrogen. Hence, the P2P system considered here is limited to a maximum power output of around 500 kWe.
The paper is open-source and visible for anyone. Have a look at the interesting study carried out by Antonio.
Abstract: “Power-to-Power is a process whereby the surplus of renewable power is stored as chemical energy in the form of hydrogen. Hydrogen can be used in situ or transported to the consumption node. When power is needed again, hydrogen can be consumed for power generation. Each of these processes incurs energy losses, leading to a certain round-trip efficiency (Energy Out/Energy In). Round-trip efficiency is calculated considering the following processes; water electrolysis for hydrogen production, compressed, liquefied or metal-hydride for hydrogen storage, fuel-cell-electric-truck for hydrogen distribution and micro-gas turbine for hydrogen power generation. The maximum achievable round-trip efficiency is of 29% when considering solid oxide electrolysis along with metal hydride storage. This number goes sharply down when using either alkaline or proton exchange membrane electrolyzers, 22.2% and 21.8% respectively. Round-trip efficiency is further reduced if considering other storage media, such as compressed- or liquefied-H2. However, the aim of the paper is to highlight there is still a large margin to increase Power-to-Power round-trip efficiency, mainly from the hydrogen production and power generation blocks, which could lead to round-trip efficiencies of around 40%–42% in the next decade for Power-to-Power energy storage systems with micro-gas turbines.”
This work has been developed within the framework of the Next Generation of Micro Gas Turbines for High Efficiency, Low Emissions and Fuel Flexibility, NextMGT, which has received funding from the European Union’s Horizon 2020 research and innovation programme under Marie Sklodowska-Curie grant agreement No 861079.
The University of Seville is also gratefully acknowledged for supporting this research through its Internal Research Programme (Plan Propio de Investigación), under contract No 2019/00000359.
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