About Methanol ultimate energy storage method
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6 FAQs about [Methanol ultimate energy storage method]
Could methanol be an alternative to hydrogen storage?
Methanol as ULDES could offer an alternative to hydrogen storage. A concept for methanol storage with carbon cycling from Baak et al. 8 is sketched in Figure 1 with all inputs and outputs. Methanol can be synthesized from electrolytic hydrogen and carbon oxides (so called “e-methanol”).
How is methanol stored?
Methanol is stored as a liquid at ambient temperature and pressure, oxygen is stored as a liquid at - 183 ∘ C, and carbon dioxide is stored as a liquid at 7 bar and - 50 ∘ C; only hydrogen is stored as a gas (at 250 bar) while it is buffered before going into the methanol synthesis. Figure inspired by Baak et al. 8
Can methanol be used as a cyclic energy source?
Upcycling carbon dioxide (CO 2) and intermittently generated renewable hydrogen to stored products such as methanol (MeOH) allows the cyclic use of carbon and addresses the challenges of storage energy density, size and transportability as well as responsiveness to energy production and demand better than most storage alternatives.
Does methanol storage reduce the cost of electricity?
The annualized cost of methanol was minimized for a grid-connected and a stand-alone case study considering current and future (2030) unit cost scenarios. The optimization results confirm that storage, especially hydrogen storage, is particularly beneficial when the electricity price is high and highly fluctuating.
Is methanol a cost-effective solution?
Since using the methanol system is still 29%–43% lower in cost than using aboveground pressure vessels for hydrogen, it presents the most cost-effective solution of those studied here where salt deposits are not accessible. The round-trip efficiency for hydrogen storage at 38% is higher than for methanol storage with carbon cycling at 35%.
How efficient is methanol storage with carbon cycling?
A study on methanol storage with carbon cycling that only considered a static calculation (without time series) found a round-trip efficiency of 30.1% and a LCOS of 240 €/ MWh el. 8 Our round-trip efficiency is higher at 35% because we assume a higher efficiency for the Allam turbine (66% versus 60%) and for the methanol synthesis (83% versus 79%).
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