Turbine system with exhaust gas recirculation, separation and extraction

A system, comprising:

• a turbine combustor, comprising:
• a housing;
• a liner defining a combustion chamber;
• a flow sleeve disposed about the liner, wherein the flow sleeve comprises a forward portion, an intermediate sleeve portion, and an aft portion;
• a first volume disposed in a head end of the turbine combustor proximate to the forward portion of the flow sleeve, wherein the first volume is configured to receive a combustion fluid and to provide the combustion fluid to the combustion chamber;
• a second volume disposed between the liner and both the intermediate sleeve portion and the aft portion of the flow sleeve, wherein the second volume is configured to receive a first flow of recirculated combustion products and to direct the first flow of recirculated combustion products along the liner to cool the liner, and at least some of the first flow of recirculated combustion products are directed out of the turbine combustor via an extraction conduit;
• a third volume disposed between an inner wall of the intermediate sleeve portion of the flow sleeve and the housing, wherein the third volume is configured to receive a second flow of recirculated combustion products and to direct the second flow of recirculated combustion products toward the extraction conduit;
• and
• a fourth volume disposed between the aft portion of the flow sleeve and the housing, wherein the third volume is configured to receive at least some of the first flow of recirculated combustion products from the second volume via a plurality of first openings of the inner wall of the intermediate sleeve portion, to receive the second flow of recirculated combustion products from the fourth volume via a plurality of second openings of an outer wall of the intermediate sleeve portion, and to direct the at least some of the first flow of recirculated combustion products and the second flow of recirculated combustion products into the extraction conduit.

A method, comprising:

• combusting an oxidant-fuel mixture in a combustion chamber of a turbine combustor to generate combustion products;
• compressing, via a recirculating fluid compressor, at least some of the combustion products generated by the turbine combustor to generate compressed combustion products;
• directing a first flow of the compressed combustion products into a second volume defined between a liner and a flow sleeve of the turbine combustor;
• cooling the liner using the first flow of the compressed combustion products;
• directing a first portion of the first flow of the compressed combustion products into the combustion chamber;
• directing a second portion of the first flow of the compressed combustion products out of the turbine combustor via an extraction conduit;
• directing a second flow of the compressed combustion products into a fourth volume defined between the flow sleeve of the turbine combustor and a housing of the turbine combustor;
• and
• directing the second flow of the compressed combustion products from the fourth volume out of the turbine combustor via the extraction conduit.