Patent ID: 8807991

Claim:
An oxidant heater internal sector arrangement comprising: a flue gas side consisting of a sector, through which a flue gas stream having a gas pressure, flows away from a boiler having a gas exit as said flue gas stream leaves said gas exit; and a counterflowing combustion oxidant side, said combustion oxidant side being comprised of: at least two secondary combustion oxidant sectors through which an oxygenated secondary combustion oxidant stream flows toward the boiler, said secondary combustion oxidant stream having a gas pressure; and at least three primary combustion oxidant sectors through which a pressurized cold primary combustion oxidant stream flows toward the boiler, said primary combustion oxidant stream having a gas pressure greater than that of said secondary combustion oxidant stream and said flue gas stream; wherein two of said at least three primary combustion oxidant sectors are positioned adjacent to both the flue gas side and to respective ones of said at least two secondary combustion oxidant sectors; and wherein said at least two secondary combustion oxidant sectors are located between the two of said primary combustion oxidant sectors positioned adjacent the flue gas side.