Patent ID: 8356992

Claim:
A method of capturing carbon dioxide in a combustion process comprising the steps of: (a) providing a primary fuel and an oxygen enriched carbon dioxide stream to a primary fuel combustion reactor where the primary fuel and the oxygen enriched carbon dioxide stream are combusted to produce heat and a primary flue gas stream including water and a carbon dioxide stream; (b) splitting the primary flue gas stream into a first flue gas portion and a second flue gas portion; (c) supplying the second flue gas portion, a decomposition fuel and an oxidized metal oxide sorbent to a decomposition reactor where the oxidized metal oxide sorbent is decomposed to a reduced metal oxide sorbent and oxygen, and the decomposition fuel is combusted with a portion of the oxygen to produce a secondary flue gas stream including the oxygen enriched carbon dioxide stream to be used in step (a); (d) transferring the reduced metal oxide sorbent to an oxidation reactor where, in the presence of air, the reduced metal oxide sorbent is re-oxidized into the oxidized metal oxide sorbent to be used in step (c); and (e) capturing carbon dioxide from the first flue gas portion.