Combined cycle plant, control device thereof, and operation method thereof

Patent metadata

Field	Value
Publication number	US-11274600-B2
Application number	US-201916678517-A
Country	US
Kind code	B2
Filing date	Nov 8, 2019
Priority date	Nov 12, 2018
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A control device causes a combined cycle plant to perform a first operation section, a second operation section, and a third operation section. In the first operation section, a first gas turbine unit and a steam turbine are driven without driving an auxiliary combustion device. The control device causes the plant to perform the second operation section in which the first gas turbine unit, the auxiliary combustion device, and the steam turbine are driven when a required output equal to or greater than a maximum output in the first operation section is received. The control device causes the plant to perform the third operation section in which the first gas turbine unit, the second gas turbine unit, and the steam turbine are driven without driving an auxiliary combustion device when a required output equal to or greater than a maximum output in the second operation section is received.

First claim

What is claimed is:

1. An operation method of a combined cycle plant comprising:
a first gas turbine unit including a first gas turbine and a first heat recovery steam generator which is configured to generate steam using heat of an exhaust gas of the first gas turbine;
a steam turbine which is configured to be driven by steam generated from the first heat recovery steam generator;
an auxiliary combustion device which is configured to burn fuel in a steam generator frame of the first heat recovery steam generator to increase an amount of generated steam so that an output of the steam turbine is increased; and
a second gas turbine unit including a second gas turbine and a second heat recovery steam generator which is configured to generate steam using heat of an exhaust gas of the second gas turbine,
the operation method of the combined cycle plant executing:
a first operation section in which the first gas turbine unit is driven without driving the auxiliary combustion device, or the first gas turbine unit and the steam turbine are driven without driving the auxiliary combustion device;
a second operation section in which the first gas turbine unit, the auxiliary combustion device, and the steam turbine are driven when a required output that is equal to or greater than a maximum output in the first operation section is received; and
a third operation section in which the first gas turbine unit, the second gas turbine unit, and the steam turbine are driven without driving the auxiliary combustion device when a required output that is equal to or greater than a maximum output in the second operation section is received.

2. The operation method of the combined cycle plant according to claim 1 , wherein any one of performance of an alternative second operation section in which the first gas turbine unit, the second gas turbine unit, and the steam turbine are driven without driving the auxiliary combustion device, and performance of the second operation section is selectable when a required output that is equal to or greater than a maximum output in the first operation section is received.

3. The operation method of the combined cycle plant according to claim 2 , wherein an indication that any one of the alternative second operation section and the second operation section is executable is displayed when a required output that is equal to or greater than a maximum output in the first operation section is received.

4. The operation method of the combined cycle plant according to claim 3 , wherein a plant efficiency when the alternative second operation section is performed and a plant efficiency when the second operation section is performed are displayed.

5. A control device of a combined cycle plant including:
a first gas turbine unit including a first gas turbine and a first heat recovery steam generator which is configured to generate steam using heat of an exhaust gas of the first gas turbine;
a steam turbine which is configured to be driven by steam generated from the first heat recovery steam generator;
an auxiliary combustion device which is configured to burn fuel in a steam generator frame of the first heat recovery steam generator to increase an amount of generated steam so that an output of the steam turbine is increased; and
a second gas turbine unit including a second gas turbine and a second heat recovery steam generator which is configured to generate steam using heat of an exhaust gas of the second gas turbine,
the control device of the combined cycle plant comprising a control unit which controls the first gas turbine unit, the steam turbine, the auxiliary combustion device, and the second gas turbine unit such that they are able to perform:
a first operation section in which the first gas turbine unit is driven without driving the auxiliary combustion device, or the first gas turbine unit and the steam turbine are driven without driving the auxiliary combustion device;
a second operation section in which the first gas turbine unit, the auxiliary combustion device, and the steam turbine are driven when a required output that is equal to or greater than a maximum output in the first operation section is received; and
a third operation section in which the first gas turbine unit, the second gas turbine unit, and the steam turbine are driven without driving the auxiliary combustion device when a required output that is equal to or greater than a maximum output in the second operation section is received.

6. The control device of the combined cycle plant according to claim 5 , further comprising a receiving unit which receives any one selection between an alternative second operation section in which the first gas turbine unit, the second gas turbine unit, and the steam turbine are driven without driving the auxiliary combustion device, and the second operation section, and causes the control unit to perform the received operation section when a required output that is equal to or greater than a maximum output in the first operation section is received.

7. The control device of the combined cycle plant according to claim 6 , further comprising a display unit which displays an indication that any one of the alternative second operation section and the second operation section is executable when a required output that is equal to or greater than a maximum output in the first operation section is received.

8. The control device of the combined cycle plant according to claim 7 , wherein the display unit displays a plant efficiency when the alternative second operation section is performed and a plant efficiency when the second operation section is performed.

9. A combined cycle plant comprising:
the control device of the combined cycle plant according to claim 5 ;
the first gas turbine unit;
the steam turbine;
the auxiliary combustion device; and
the second gas turbine unit.

Assignees

• Mitsubishi Hitachi Power Sys Ltd
• Mitsubishi Power Ltd

Inventors

• Tsukuda Yuya
• Shirahama Yasuhiro

Classifications

• F02C9/42 Primary

  specially adapted for the control of two or more plants simultaneously · CPC title

• F02N9/04

  the pressure fluid being generated otherwise, e.g. by compressing air · CPC title

• F01K13/02

  Controlling, e.g. stopping or starting · CPC title

• F22B1/1815

  using the exhaust gases of gas-turbines · CPC title

• F02C6/18 Primary

  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 title