Gas turbine cooling system, gas turbine facility including the same, and control device and control method of gas turbine cooling system

Patent metadata

Field	Value
Publication number	US-2018372000-A1
Application number	US-201615777767-A
Country	US
Kind code	A1
Filing date	Dec 6, 2016
Priority date	Dec 24, 2015
Publication date	Dec 27, 2018
Grant date	—

Abstract

A gas turbine cooling system includes: a cooling air line that guides compressed air; a cooler that cools the compressed air; a flow rate adjuster that adjusts the flow rate of the cooling air; and a control device. The control device includes: a load change determination unit that determines whether a load indicated by a load command of the gas turbine has changed; a first command generation section that generates a first command indicating such an operation amount of the flow rate adjuster as allows the flow rate of the cooling air to meet a target flow rate; and a second command generation section that, when it is determined that the load indicated by the load command has changed, generates a second command indicating such an operation amount of the flow rate adjuster as allows a change-adapted flow rate higher than the target flow rate to be met.

First claim

1 . A control device of a gas turbine cooling system including:
a cooling air line that guides compressed air compressed by an air compressor of a gas turbine to a hot part coming in contact with combustion gas in the gas turbine; a cooler that cools the compressed air in the cooling air line to produce cooling air; a booster that pressurizes the cooling air in the cooling air line; and a flow rate adjuster that adjusts a flow rate of the cooling air supplied to the hot part through the cooling air line, the control device comprising: a reception unit that receives a load command indicating a load on the gas turbine; a load change determination unit that determines whether the load indicated by the load command received by the reception unit has changed; a first command generation section that generates a first command indicating such an operation amount of the flow rate adjuster as allows the flow rate of the cooling air supplied to the hot part to meet a target flow rate that is determined according to an operation state of the gas turbine; a second command generation section that, when the load change determination unit determines that the load indicated by the load command has changed, generates a second command indicating such an operation amount of the flow rate adjuster as allows a change-adapted flow rate higher than the target flow rate to be met; and a command output unit that outputs a flow rate adjuster command based on the second command to the flow rate adjuster when the second command generation section is generating the second command, and outputs a flow rate adjuster command based on the first command to the flow rate adjuster when the second command generation section is not generating the second command.

2 . The control device of a gas turbine cooling system according to claim 1 , wherein the change-adapted flow rate is higher than the target flow rate by a predetermined percentage.

3 . The control device of a gas turbine cooling system according to claim 1 , wherein the second command generation section generates, as the second command, a command indicating such a feedforward target operation amount of the flow rate adjuster as allows the change-adapted flow rate to be met.

4 . The control device of a gas turbine cooling system according to claim 1 , wherein the second command generation section generates, as the second command, a command indicating a feedback operation amount of the flow rate adjuster that is determined so as to reduce a deviation between a target value related to the change-adapted flow rate and a current flow rate of the cooling air.

5 . The control device of a gas turbine cooling system according to claim 1 , wherein, after the load change determination unit determines that the load indicated by the load command has changed, the second command generation section stops generating the second command when the load change determination unit determines that the change in the load indicated by the load command has ended.

6 . The control device of a gas turbine cooling system according to claim 1 , wherein, after the load change determination unit determines that the load indicated by the load command has changed, the second command generation section stops generating the second command when the change in the load indicated by the load command is determined to have ended and a predetermined second command stop condition is satisfied.

7 . The control device of a gas turbine cooling system according to claim 1 , wherein
the gas turbine cooling system includes a cooling amount adjuster that adjusts an amount of cooling to which the compressed air is subjected by the cooler, and the control device further comprises: a third command generation section that generates a third command indicating such an operation amount of the cooling amount adjuster as allows a temperature of the cooling air to meet a target temperature; a fourth command generation section that, when the load change determination unit determines that the load indicated by the load command has changed, generates a fourth command indicating such an operation amount of the cooling amount adjuster as allows the temperature of the cooling air to meet a change-adapted temperature lower than the target temperature; and a command output unit that outputs a cooling amount adjuster command based on the fourth command to the cooling amount adjuster when the fourth command generation section is generating the fourth command, and outputs a cooling amount adjuster command based on the third command to the cooling amount adjuster when the fourth command generation section is not generating the fourth command.

8 . The control device of a gas turbine cooling system according to claim 7 , wherein the change-adapted temperature is lower than the target temperature by a predetermined percentage.

9 . The control device of a gas turbine cooling system according to claim 7 , wherein the fourth command generation section generates, as the fourth command, a command indicating such a feedforward target operation amount of the cooling amount adjuster as allows the change-adapted temperature to be met.

10 . The control device of a gas turbine cooling system according to claim 7 , wherein the fourth command generation section generates, as the fourth command, a command indicating a feedback operation amount of the cooling amount adjuster that is determined so as to reduce a deviation between a target value of the change-adapted temperature and a current temperature of the cooling air.

11 . The control device of a gas turbine cooling system according to claim 7 , wherein, after the load change determination unit determines that the load indicated by the load command has changed, the fourth command generation section stops generating the fourth command when the load change determination unit determines that the change in the load indicated by the load command has ended.

12 . The control device of a gas turbine cooling system according to claim 7 , wherein, after the load change determination unit determines that the load indicated by the load command has changed, the fourth command generation section stops generating the fourth command when the load change determination unit determines that the change in the load indicated by the load command has ended and a predetermined fourth command stop condition is satisfied.

13 . A gas turbine cooling system comprising:
the control device of a gas turbine cooling system according to claim 1 ; the cooling air line; the cooler; the booster; and the flow rate adjuster, wherein the flow rate adjuster is an intake valve that is provided in an intake air line of the cooling air line located on a side of the air compressor from the booster, and that adjusts a flow rate of the cooling air flowing through the intake air line.

14 . A gas turbine cooling system comprising:
the control device of a gas turbine cooling system according to claim 1 ; the cooling air line; the cooler; the booster; and the flow rate adjuster, wherein the cooling air line has an intake air line that guides compressed air compressed by the air compressor to the booster, a discharge line that guides air pressurized by the booster to the hot part, and a return line that returns air flowing through the discharge line to the intake air line, and the flow rate adjuster is a return valve that adjusts a flow rate of the air flowing through the return line.

15 . A gas turbine cooling system comprising:
the control device of a gas turbine cooling system according to claim 1 ; the cooling air line; the cooler;

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Fujii Satoko
• Yabe Tetsuya
• Higashi Kazuya

Classifications

• F05D2270/331

  Mechanical loads · CPC title

• F02C9/18 Primary

  by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages {(F02C3/113 takes precedence)} · CPC title

• F05D2270/335

  Output power or torque · CPC title

• F05D2260/213

  by the provision of a heat exchanger within the cooling circuit · CPC title

• F02C7/185 Primary

  Cooling means for reducing the temperature of the cooling air or gas · CPC title