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US 11,635,255 B1Granted
Liquid or supercritical carbon dioxide capture from exhaust gas
AssigneeAxip Energy Services, LP
InventorsRobert Stiles, David Thomas Stiles, Christopher Cory Vail, John Guoynes, Robert Earl Ashley
Life of this patent
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Abstract
Carbon dioxide is recovered from an exhaust gas in the form of liquid carbon dioxide or supercritical carbon dioxide utilizing a rotary separator. Nitrogen gas recovered from the rotary separator can be expanded to provide cooling for carbon dioxide in a closed-loop CO2 power cycle that is used to cool the exhaust gas upstream of the rotary separator. The recovery can power itself and can produce excess electricity from waste heat.
Claims20
A process comprising:
- cooling, in a first heat exchanger, an exhaust gas stream comprising carbon dioxide gas, nitrogen gas, and water vapor to produce a cooled exhaust gas stream comprising the carbon dioxide gas, the nitrogen gas, and liquid water;
- separating the cooled exhaust gas stream into a liquid stream comprising the liquid water and a dehydrated exhaust gas stream comprising the carbon dioxide gas and the nitrogen gas;
- compressing the dehydrated exhaust gas stream to form a compressed exhaust gas stream;
- cooling, in a second heat exchanger, the compressed exhaust gas stream to form a cooled compressed exhaust gas stream;
- expanding, in a first expander, the cooled compressed exhaust gas stream to produce a dense fluid stream comprising the nitrogen gas and a dense carbon dioxide;
- and
- separating, in a rotary separator, the dense fluid stream into a nitrogen product stream comprising the nitrogen gas and a carbon dioxide product stream comprising supercritical carbon dioxide,
- wherein a carbon dioxide outlet pressure of the rotary separator is greater than the critical pressure of carbon dioxide such that the rotary separator emits the supercritical carbon dioxide in the carbon dioxide product stream.
5 more elements
Dependencies are inferred from the claim text.