Exhaust gas recirculation type combined plant

• US 20020043063A1
• Filed: 09/06/2001
• Published: 04/18/2002
• Est. Priority Date: 06/27/1997
• Status: Active Grant

• Current Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Masaki Kataoka, Motoaki Utamura, Takaaki Kuwahara
• Inventors: Kataoka, Masaki, Utamura, Motoaki, Kuwahara, Takaaki
• Granted Patent: US 6,598,402 B2
• Time in Patent Office: Days
• US Class Current: 60/39.182
• CPC Class Codes: F02C 3/305 Increasing the power, speed, torque or efficiency of a gas turbine or the thrust of a turbojet engine by injecting or adding water, steam or other fluids F01K21/04 takes precedence
• CPC Class Codes: F02C 3/34 with recycling of part of the working fluid, i.e. semi-closed cycles with combustion products in the closed part of the cycle
• CPC Class Codes: F02C 6/18 using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants using waste heat as source of energy for refrigeration plants F25B27/02; using the waste heat of a gasturbine for steam generation or in a steam cycle see F01K23/10
• CPC Class Codes: F02C 7/08 Heating air supply before combustion, e.g. by exhaust gases
• CPC Class Codes: F02C 9/18 by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages F02C3/113 takes precedence
• CPC Class Codes: Y02E 20/16 Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Abstract

Widening a partial load operation range of an exhaust gas recovery type combined cycle plant in which a gas turbine and steam turbine are combined and further improving heat efficiency.

Suppressing a temperature of internal gas in the compressor when recirculating gas turbine exhaust gas at partial load operation time and then returning to the compressor so as to increase exhaust gas recirculation amount. The partial load operation range can be widened and further the heat efficiency can be improved.

Claims

1. An exhaust gas recirculation type gas turbine apparatus comprising:

a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combustion chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine; and

a spray unit for introducing liquid droplets into an interior of said compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows so as to vaporize the introduced liquid droplet during a flow in in compressor.

11. An exhaust gas recirculation type gas turbine apparatus according to claim 1 further comprising a control unit for controlling a spray amount of droplet from sad spray unit depending on a humidity of air supplied to the compressor.

13. An exhaust gas recirculation type gas turbine apparatus according to claim 12 wherein said carbon dioxide gas removing means is disposed between a diverging portion of said recirculation path of said gas turbine exhaust gas path and an emitting portion for emitting said gas turbine exhaust gas to the air.

14. An exhaust gas recirculation type gas turbine apparatus according to claim 12 wherein said carbon dioxide gas removing means is disposed between said gas turbine of said gas turbine exhaust gas path and a diverging portion of said recirculating path.

15. An exhaust gas recirculation type gas turbine apparatus according to claim 12 wherein said carbon dioxide gas removing means is disposed on said recirculatirg path.

2. An exhaust gas recirculation type gas turbine apparatus comprising:

a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combustion chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine; and

a spray unit for spraying liquid droplets over air supplied to said compressor and gas turbine exhaust gas passing through said recirculation path so as to introduce the liquid droplets into the compressor in which said air and said gas turbine exhaust gas flow so that said introduced liquid droplets are vaporized during a flow in said compressor.

3. An exhaust gas recirculation type gas turbine apparatus comprising a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combustion chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine; and

a spray unit for spraying liquid droplets having an average diameter of 30 μ

m or below so as to introduce the liquid droplets into the compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows, and said spray unit being disposed at the upstream of said compressor.

4. An exhaust gas recirculation type gas turbine apparatus comprising, a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combination chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine;

a spray unit for introducing liquid droplets into an interior of said compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows so as to vaporize the introduced liquid droplet during a flow in said compressor; and

a spray amount control unit for controlling a spray amount of said liquid droplets corresponding to said recirculation amount.

5. An exhaust gas recirculation type gas turbine apparatus comprising a compressor for compressing air;

a combustion chamber for burning compressor air exhausted from said compressor and fuel;

a gas turbine driver by gas turbine exhaust gas from said combustion chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine;

a spray unit for introducing liquid droplets into an interior of said compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows so as to vaporize the introduced liquid droplet during a flow in said compressor; and

a spray amount control unit for controlling a spray amount of said liquid droplets corresponding to a change in load of the gas turbine apparatus.

6. An exhaust gas recirculation type gas turbine apparatus comprising:

a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combustion chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine;

a spray unit for introducing liquid droplets into an interior of said compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows so as to vaporize the introduced liquid droplet during a flow in said compressor; and

a spray amount control unit for controlling a spray amount of said liquid droplets corresponding to a change in the temperature of mixing gas to be introduced into said compressor.

7. An exhaust gas recirculation type gas turbine comprising:

a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combustion chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine;

a spray unit for introducing liquid droplets into an interior of said compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows so as to vaporize the introduced liquid droplet during a flow in said compressor; and

a control unit for controlling said recirculation amount and a spray amount of said liquid droplets corresponding to the load so as to suppress a change in the combustion temperature of the combustion chamber under a gas turbine load of within the range of 50%-80%.

8. An exhaust gas recirculation type combined cycle plant apparatus comprising:

a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combustion chamber;

an exhaust heat recovery boiler 4 for recovering heat of the exhaust gas from the gas turbine 3 so as to generate steam by heat exchange with supplied water;

a steam turbine 5 which is driven by the steam generated by the exhaust heat recovery boiler 4;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine;

a spray unit for introducing liquid droplets into an interior of said compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows so as to vaporize the introduced liquid droplet during a flow in said compressor; and

a control unit for controlling said spray amount in a combined cycle plan;

load within the range of 50%-80% so that the recirculation amount is continuously increased as the load decreases.

9. An exhaust gas recirculation type gas turbine apparatus comprising:

a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combustion chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a spray unit for introducing liquid droplets into an interior of said compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows so as to vaporize the introduced liquid droplet during a flow in said compressor;

a temperature detector for detecting a temperature of air supplied to the compressor; and

a control unit for controlling so that in the case of a first temperature region in which said detected temperature is set, said recirculation is executed and spray of droplets from said spray unit is stopped, in the case of a second temperature region which is higher than said first temperature region, said recirculation is executed and the spray of droplets from said spray unit is executed and in the case of a third temperature region which is higher than said second temperature region, said recirculation is stopped and the spray of droplets from said spray unit is executed.

10. An exhaust gas recirculation type gas turbine apparatus comprising:

a compressor for compressing air;

a combustion chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said combustion chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;

a spray unit for introducing liquid droplets into an interior of said compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows so as to vaporize the introduced liquid droplet during a flow in said compressor;

a temperature detector for detecting a temperature of air supplied to the compressor; and

a control unit for controlling so that in the case of a first temperature region in which said detected temperature is set, said recirculation is executed and spray of droplets from said spray unit is stopped, in the case of a second temperature region which is higher than said first temperature region, said recirculation is stopped and the spray of droplets from said spray unit is stopped and in the case of a third temperature region which is higher than said second temperature region, said recirculation is stopped and the spray of droplets from said spray unit is executed.

12. An exhaust gas recirculation type gas turbine apparatus comprising:

a compressor for compressing air;

a gas turbine chamber for burning compression air exhausted from said compressor and fuel;

a gas turbine driven by gas turbine exhaust gas from said gas turbine chamber;

a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor; and

a carbon dioxide gas removing unit installed in a flow path of gas turbine exhaust gas for reducing the concentration of carbon dioxide gas in the gas turbine exhaust gas discharged after air containing the recirculated exhaust gas is introduced to said gas turbine chamber.

16. An operation method of exhaust gas recirculation type gas turbine apparatus comprising the steps of:

compressing air in a compressor;

burning the compressed air and fuel;

driving a gas turbine with gas turbine exhaust gas from said combustion chamber;

recirculating a part of said gas turbine exhaust gas to an intake of said compressor through a recirculation path;

adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in the load of said gas turbine; and

introducing liquid droplets into the compressor in which mixing gas comprising gas turbine exhaust gas passing through said recirculation path and air flows by spraying the liquid droplets from a spray unit so that the introduced liquid droplets are vaporized during a flow in said compressor.

17. An operation method of exhaust gas recirculation type gas turbine apparatus comprising the steps of:

compressing air in a compressor;

burning the compressed air and fuel;

driving a gas turbine with gas turbine exhaust gas from said combustion chamber;

recirculating a part of said exhaust gas to an intake of said compressor through a recirculation path;

adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in the load on said gas turbine;

controlling said recirculation amount corresponding to the load so as to suppress a change in the combustion temperature of the combustion chamber in a gas turbine load within the range of 50%-80%; and

introducing liquid droplets into the compressor so as to suppress a rise of the temperature of the compression air at an exit of the compressor.

18. An operation method of exhaust gas recirculation type combined cycle plant comprising the steps of:

compressing air in a compressor;

burning the compressed air and fuel;

driving a gas turbine with gas turbine exhaust gas from said combustion chamber;

an exhaust heat recovery boiler for recovering hear of the exhaust gas from the gas turbine 3 so as to generate steam by heat exchange with supplied water;

a steam turbine 5 which is driven by the steam generated by the exhaust heat recovery boiler 4;

recirculating a part of said gas turbine exhaust gas to an intake of said compressor through a recirculation path;

adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in the load of said gas turbine;

controlling said recirculation amount corresponding to the load so as to suppress a change in the combustion temperature of the combustion chamber in a combined cycle plant load within the range of 50%-80%; and

controlling said spray amount of the liquid droplets to be vaporized during a flow in said compressor so that the recirculation amount is continuously increased as the load decreases.

19. A running method of an exhaust gas recirculation type turbine apparatus comprising the steps of:

compressing air by a compressor;

burning the compressed air and fuel in a combustion chamber;

driving a gas turbine by gas turbine exhaust gas from said combustion chamber;

recirculating a part of said exhaust gas to an intake of said compressor through a recirculation path;

spraying liguid droplets from a spray unit to introduce the liquid droplets into the compressor in which mixing gas comprising gas turbine exhaust gas and air flows through said recirculation path so as to vaporize the introduced liquid droplet during a flow in said compressor;

detecting a temperature of air supplied to the compressor; and

controlling so that in the case of a first temperature region in which said detected temperature is set, said recirculation is executed and said spray is stopped, in the case of a second temperature region which is higher than said first temperature region, said recirculation is executed and said spray is executed and in the case of a third temperature region which is higher than said second temperature region, said recirculation is stopped and said spray is executed.

20. A running method of an exhaust gas recirculation type turbine apparatus comprising the steps of:

compressing air by a compressor;

burning the compressed air and fuel in a combustion chamber;

driving a gas turbine by gas turbine exhaust gas from said combustion chamber, recirculating a part of said exhaust gas to an intake of said compressor through a recirculation path;

spraying liquid droplets from a spray unit to introduce the liquid droplets into the compressor in which mixing gas comprising gas turbine exhaust gas and air flows through said recirculation path so as to vaporize the introduced liquid droplet during a flow in said compressor;

detecting a temperature of air supplied to the compressor; and

controlling so that in the case of a first temperature region in which said detected temperature is set, said recirculation is executed and said spray is stopped, in the case of a second temperature region which is higher than said first temperature region, said recirculation is stopped and said spray is stopped and in the case of a third temperature region which is higher than said second temperature region, said recirculation is stopped and said spray is executed.

21. An operation method of exhaust gas recirculation type combined cycle plant comprising the steps of:

compressing air in a compressor;

burning the compressed air and fuel in a gas turbine chamber;

driving a gas turbine with gas turbine exhaust gas from said gas turbine chamber;

recirculating a part of said gas turbine exhaust gas to an intake of said compressor through a recirculating path; and

burning fuel with air containing said gas turbine exhaust gas recirculated in said gas turbine chamber so as to reduce the concentration of carbon dioxide gas in gas turbine exhaust gas discharged after the burning.