Gas turbine system using supplemental compressed air to cool

1. A gas turbine system comprising:

a compressing portion;

a combustor generating a combustion operation by using first compressed air coming from the compressing portion;

a turbine portion generating power by using a combustion gas coming from the combustor;

a heat recoverer recovering a heat from a discharge gas of the turbine portion;

a compressed air supplier providing second compressed air to which the heat recovered by the heat recoverer is transferred; and

a branching unit allowing the second compressed air that has received the heat from the heat recoverer to branch off to a first duct line connected to the combustor and a second duct line connected to the turbine portion,

wherein the compressing portion comprises a plurality of compressing stages, and the turbine portion comprises a plurality of expansion stages, and the plurality of compressing stages and the plurality of expansion stages are connected by using cooling duct lines, and the cooling duct lines are connected to respective connection duct lines,

wherein one end of the first duct line is directly connected to the branching unit, and the other end of the first duct line is directly connected to the combustor, and

wherein one end of the second duct line is directly connected to the branching unit, and the second duct line is directly connected to the respective connection duct lines, and

wherein at least a portion of the second compressed air to which the heat has been transferred is supplied to at least one of the combustor or the turbine portion.

2. The gas turbine system of claim 1 , wherein the second compressed air to which the heat has been transferred is transferred to at least a portion of the plurality of expansion stages.

3. The gas turbine system of claim 1 , wherein valves are respectively installed to the connection duct lines.

4. The gas turbine system of claim 1 , wherein the heat recoverer comprises a stack to which the discharge gas is discharged, and a heat exchanger exchanging heat with the second compressed air is disposed on the stack.

5. The gas turbine system of claim 1 , wherein the heat recoverer comprises a heat recovery steam generator.

6. The gas turbine system of claim 5 , comprising:

a regenerative heat exchanger transferring heat to the second compressed air by using steam generated by the heat recovery steam generator.

7. The gas turbine system of claim 1 , wherein the compressed air supplier is driven by using power generated by the turbine portion.

8. The gas turbine system of claim 7 , further comprising:

a clutch controlling transfer of power which is generated by the turbine portion and transferred to the compressed air supplier.

9. The gas turbine system of claim 1 , wherein the compressed air supplier is driven by power generated by a power generating unit.

10. The gas turbine system of claim 1 , wherein the compressed air supplier comprises a plurality of compressors.

11. The gas turbine system of claim 1 , wherein the compressed air supplier comprises a compressed air storage unit in which the second compressed air is stored.

12. The gas turbine system of claim 1 , comprising:

a generator performing electricity generation by using power generated by the turbine portion.

13. The gas turbine system of claim 1 , wherein the compressing portion, the combustor, the turbine portion, and the heat recoverer are disposed in plural.

14. A gas turbine system comprising:

a compressing portion;

a combustor generating a combustion operation by using first compressed air coming from the compressing portion;

a turbine portion generating power by using a combustion gas coming from the combustor;

a heat recoverer recovering a heat from a discharge gas of the turbine portion and comprising a heat recovery steam generator;

a compressed air supplier providing second compressed air to which the heat recovered by the heat recoverer is transferred; and

a branching unit allowing the second compressed air that has received the heat from the heat recoverer to branch off to a first duct line connected to the combustor and a second duct line connected to the turbine portion,

wherein the compressing portion comprises a plurality of compressing stages, and the turbine portion comprises a plurality of expansion stages, and the plurality of compressing stages and the plurality of expansion stages are connected by using cooling duct lines, and the cooling duct lines are connected to respective connection duct lines,

wherein one end of the first duct line is directly connected to the branching unit, and the other end of the first duct line is directly connected to the combustor, and

wherein one end of the second duct line is directly connected to the branching unit, and the second duct line is directly connected to the respective connection duct lines, and

wherein at least a portion of the second compressed air to which the heat has been transferred is supplied to the combustor.

15. A gas turbine system comprising:

a compressing portion;

a combustor generating a combustion operation by using first compressed air coming from the compressing portion;

a turbine portion generating power by using a combustion gas coming from the combustor;

a heat recoverer recovering a heat from a discharge gas of the turbine portion and comprising a heat recovery steam generator;

a compressed air supplier providing second compressed air to which the heat recovered by the heat recoverer is transferred; and

a branching unit allowing the second compressed air that has received the heat from the heat recoverer to branch off to a first duct line connected to the combustor and a second duct line connected to the turbine portion,

wherein the compressing portion comprises a plurality of compressing stages, and the turbine portion comprises a plurality of expansion stages, and the plurality of compressing stages and the plurality of expansion stages are connected by using cooling duct lines, and the cooling duct lines are connected to respective connection duct lines,

wherein one end of the first duct line is directly connected to the branching unit, and the other end of the first duct line is directly connected to the combustor, and wherein one end of the second duct line is directly connected to the branching unit, and the second duct line is directly connected to the respective connection duct lines, and

wherein at least a portion of the second compressed air to which the heat has been transferred is supplied to the turbine portion.