Configurations and methods of carbon capture
AssigneeFluor Technologies Corporation
InventorsSatish Reddy, Sunil Vyas, Jeffrey Scherffius
Life of this patent
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Abstract
An IGCC plant has a precombustion decarbonization unit in which acid gas is removed from a combustion gas before the combustion gas enters a combustion turbine. In one preferred configuration, a sulfur removal unit removes hydrogen sulfide from a feed gas before the desulfurized feed gas enters an autorefrigeration unit in which carbon dioxide is removed. In another preferred configuration, hydrogen sulfide is converted to carbonyl sulfide in a dryer, and the carbonyl sulfide is absorbed in the liquid carbon dioxide that is prepared from the feed gas using autorefrigeration.
Claims5
A method of removing hydrogen sulfide from shifted syngas, comprising:
- dehydrating and cooling the shifted syngas in an amount sufficient to convert the hydrogen sulfide in the shifted syngas to carbonyl sulfide;
- absorbing the carbonyl sulfide from the shifted syngas in an absorber using liquid carbon dioxide to produce a desulfurized syngas and a carbonyl sulfide containing liquid carbon dioxide product;
- feeding the desulfurized syngas into an autorefrigeration unit to form the liquid carbon dioxide from the desulfurized syngas and to further produce a desulfurized and decarbonized syngas;
- using refrigeration content in the desulfurized and decarbonized syngas and the carbonyl. sulfide containing liquid carbon dioxide product in the step of cooling the shifted syngas;
- and
- feeding the desulfurized and decarbonized syngas into a hydrogen pressure swing absorption (PSA) unit to produce a hydrogen product and a carbon dioxide-containing PSA offgas.
Dependencies are inferred from the claim text.