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by pfdietz
933 days ago
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The proposal I've heard for using CO2 to make e-fuels for grid storage would work like this: 1) Electrolyze water to H2 and O2.
2) Store the O2 (either as compressed gas or LOX).
3) Use the H2 with CO2 to make hydrocarbons or other fuels (methanol?).
4) The fuel is eventually burned in Allam cycle turbines, using the stored oxygen to burn the fuel in compressed CO2 (oxyfuel combustion). The produced CO2 of combustion comes off with water and is easily separated for storage for use in step (3). This still has storage (oxygen, CO2, and the produced fuel) but these may be easier than storing hydrogen in locations without suitable geology. |
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