Patent ID: 7621973

Claim:
A gasification system comprising: a pressure vessel comprising a partial oxidation reactor configured to direct products of partial oxidation to an outlet passage, said products of partial oxidation comprising fuel gas, unburned carbon, and carbon dioxide; and a carbon dioxide recycle system configured to recover carbon dioxide by separating carbon dioxide from the products of partial oxidation and to inject the recovered carbon dioxide into the pressure vessel as a moderator; wherein the pressure vessel further comprises: a secondary reaction chamber coupled in flow communication with said partial oxidation reactor said secondary reaction chamber circumscribes said partial oxidation reactor such that said secondary reaction chamber receives the flow of the products of partial oxidation discharged from said partial oxidation reactor; a moderator injection header coupled in flow communication with said carbon dioxide recycle system for channeling a flow of moderator into said secondary reaction chamber; and a fallout zone in flow communication with the secondary reaction chamber, the fallout zone configured to facilitate separation of solid products of partial oxidation from gaseous products of partial oxidation.