Method and apparatus for optimizing the operation of a turbine system under flexible loads

Patent metadata

Field	Value
Publication number	US-10544739-B2
Application number	US-201615049674-A
Country	US
Kind code	B2
Filing date	Feb 22, 2016
Priority date	Nov 23, 2011
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

A gas turbine system includes a compressor protection subsystem; a hibernation mode subsystem; and a control subsystem that controls the compressor subsystem and the hibernation subsystem. At partial loads on the turbine system, the compressor protection subsystem maintains an air flow through a compressor at an airflow coefficient for the partial load above a minimum flow rate coefficient where aeromechanical stresses occur in the compressor. The air fuel ratio in a combustor is maintained where exhaust gas emission components from the turbine are maintained below a predetermined component emission level while operating at partial loads.

First claim

What is claimed:

1. A gas turbine system comprising:
a compressor;
a combustor;
a turbine;
a compressor protection subsystem;
wherein the compressor protection subsystem comprises a compressor bleed line, an exhaust gas extraction line, and a blending assembly coupled to the compressor bleed line and the exhaust gas extraction line;
a hibernation mode subsystem;
wherein the hibernation mode subsystem comprises a compressor air overboarding line in communication with the compressor bleed line; and
a control subsystem that controls the compressor protection subsystem and the hibernation mode subsystem.

2. The gas turbine system of claim 1 further comprising:
a bleed control valve disposed on the compressor bleed line; and
a recirculation control valve disposed on the exhaust gas extraction line.

3. The gas turbine system of claim 1 further comprising:
a bleed flow sensor disposed on the compressor bleed line;
a recirculation flow sensor disposed on the exhaust gas extraction line.

4. The gas turbine system of claim 1 wherein the blending assembly comprises an eductor.

5. The gas turbine system of claim 1 further comprising:
an attemperation subsystem coupled to the combustor; and
a heat recovery steam generator subsystem coupled to the attemperation subsystem.

6. The gas turbine system of claim 5 wherein the attemperation subsystem comprises:
a working fluid source;
a shaped baffle assembly; and
a plurality of fogger injection nozzles coupled to the working fluid source and disposed in the shaped baffle assembly.

7. The gas turbine system of claim 6 wherein the shaped baffle assembly comprises a plurality of baffles disposed downstream from the fogger injection nozzles.

8. The gas turbine system of claim 1 further comprising:
a turndown subsystem;
wherein the turndown subsystem comprises a heat recovery steam generator in communication with the compressor air overboarding line;
a combined cycle isotherm subsystem comprising at least a fogger nozzle; and
the control subsystem that provides instructions to the turndown subsystem to maintain in airflow through the compressor an inner flow coefficient for the partial load up of a minimum flow rate coefficient where aeromechanical stresses occur in the compressor.

9. The gas turbine system of claim 8 wherein the control subsystem provides instructions to the hibernation mode subsystem to maintain an air fuel ratio in the combustor so that exhaust gas emission components from the turbine are maintained below a predetermined component emission level.

10. The gas turbine system of claim 8 wherein the control subsystem provides instructions to the combined cycle isotherm subsystem to maintain an exhaust gas temperature at an inlet of the heat recovery steam generator below a predetermined maximum inlet temperature.

Assignees

• Gen Electric

Inventors

• Scipio Alston Ilford
• Cocca Michael Anthony
• Freeman Thomas John
• Yarnold Michael Wesley
• Obenhoff Ryan Eric
• Ekanayake Sanji
• Warwick Douglas Corbin
• Klosinski Joseph Philip

Classifications

• F05D2270/3061

  of the working fluid · CPC title

• F02C7/057

  Control or regulation (conjointly with fuel supply control F02C9/50, with nozzle area control F02K1/16) · CPC title

• F05D2220/722

  as part of an integrated gasification combined cycle · CPC title

• F05D2270/313

  Air temperature · CPC title

• F05D2260/601

  using an ejector or a jet pump · CPC title