Method and system for use with an integrated gasification combined cycle plant

1. A method of operating an integrated gasification combined cycle power generation system, said method comprising:

compressing air in an adiabatic air compressor to produce a compressed heated air stream;

heating a nitrogen stream and a condensate stream using a first portion of the compressed heated air stream to produce a heated nitrogen stream and a cooled compressed air stream;

heating an oxygen stream and the condensate stream using a second portion of the compressed heated air stream; and

channeling the cooled compressed air stream to an air separation unit.

2. A method in accordance with claim 1 further comprising:

producing a medium pressure steam stream using the compressed heated air stream; and

channeling the medium pressure steam stream into a steam cycle.

3. A method in accordance with claim 1 further comprising extracting a compressed air stream from a gas turbine engine, wherein the compressed air stream includes the extracted compressed air.

4. A method in accordance with claim 1 further comprising heating a condensate stream using the compressed heated air stream.

5. A method in accordance with claim 1 further comprising:

heating an oxygen stream using the compressed heated air stream to produce a heated oxygen stream; and

channeling the heated oxygen stream into a gasification unit.

6. A method in accordance with claim 1 further comprising channeling the heated nitrogen stream into a combustor.

7. A method in accordance with claim 1 wherein heating a nitrogen stream using the compressed heated air further comprises:

extracting a secondary air stream from the compressed heated air stream;

heating at least the nitrogen stream using the compressed heated air stream; and

producing at least a medium pressure steam stream using the secondary air stream.

8. A method in accordance with claim 1 further comprising compressing the nitrogen stream before heating the nitrogen stream.

9. A method in accordance with claim 1 , wherein heating a nitrogen stream using the compressed heated air stream further comprises:

producing steam using the second portion of the compressed heated air stream.

10. A method in accordance with claim 9 further comprising:

channeling the heated nitrogen stream into a gas turbine engine to generate power;

channeling the heated oxygen stream into a gasification unit to generate at least syngas; and

channeling the steam into a steam cycle for generating power.