Abstrakt
Oxy combustion is the most promising technology for carbon dioxide,
originated from thermal power plants, capture and storage. The oxygen in
sufficient quantities can be separated from air in cryogenic
installations. Even the state-of-art air separation units are
characterized by high energy demands decreasing net efficiency of thermal
power plant by at least 7%. This efficiency decrease can be mitigated by
the use of waste nitrogen, e.g., as the medium for lignite drying. It is
also possible to store energy in liquefied gases and recover it by liquid
pressurization, warm-up to ambient temperature and expansion. Exergetic
efficiency of the proposed energy accumulator may reach 85%.
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