Sustainable LH2 energy cycle
Wybrane pełne teksty z tego czasopisma
Hydrogen energy cycle in a decentralized economy is a subject of discussion and research effort to find justification for usage of liquid hydrogen in conjunction with SOFC and SOEC and superconducting energy storage devices. The renewable energy sources are envisage to provide electricity to split water to H2and O2 using high temperature electrolysis which can be beneficial thanks to the decrease of the energy demand due to the thermodynamics and improved electrochemical kinetics. Additionally O2 and H2 can be effective cryogenic liquids with boiling temperatures of 55K (under lower pressure) and 20K respectively. It is proposed that both gases O2 and H2 can be used in conjunction with recently developed mix gas cryocooler working at very low pressure and providing refrigeration at temperature below inversion temperature of hydrogen (118K). Liquefied hydrogen at temperature of 20K is a very efficient coolant for high temperature superconducting energy storage devices such flywheel and even SMES made from MgB2. The H2 and O2 can be used in SOFC or PFC generating electricity when it is needed. The fact that SOFC is exothermic and SOEC is endothermic, enable realisation of the thermally balanced heat and electricity cycle. It was concluded that combination of the balanced SOFC/SOEC stacks in conjunction with liquefaction of the H2 and O2 products makes the overall LH2energy cycle sustainable and applicable to other modern energy storage devices such as superconducting flywheel.
Bibliogr. 8 poz., rys., wykr.
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