Advanced humid air gas turbine system

Patent metadata

Field	Value
Publication number	US-9677471-B2
Application number	US-201414537155-A
Country	US
Kind code	B2
Filing date	Nov 10, 2014
Priority date	Nov 11, 2013
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

One of the objects of the invention is to provide a water-saving type advanced humid air gas turbine system (AHAT) that can decrease the amount of makeup water to be supplied from the outside, by reducing the amount of water consumed when the gas turbine system is starting up, shut down, or subjected to load rejection. The gas turbine system includes a compressor, the compressed air header for generating humidified combustion air, a combustor for generating combustion gas, and the turbine. When the gas turbine system is starting up, shut down or subjected to load rejection, steam coming from the heat recovery steam generator is recovered by blocking the first steam system and making the second steam system communicate with the heat recovery steam generator.

First claim

What is claimed is:

1. An advanced humid air gas turbine system comprising:
a gas turbine system that includes a compressor for compressing air,
a compressed air header for mixing high-pressure air introduced from the compressor with steam to generate humidified combustion air,
a combustor for mixing combustion air from the compressed air header with fuel to generate combustion gas, and
a turbine driven by the combustion gas that is generated by the combustor;
a heat recovery steam generator for generating steam by use of exhaust gas from the turbine;
a water recovery system disposed on a downstream side of the heat recovery steam generator,
the water recovery system recovering moisture contained in the exhaust gas;
a first steam system comprising: a first steam line from the heat recovery steam generator, to the compressed air header; and
a second steam system for supplying steam to mix with an exhaust gas flow within the heat recovery steam generator comprising: a second steam line that is in fluid communication with the first steam line and the exhaust gas flow within the heat recovery steam generator,
wherein when the gas turbine system is starting up,
shut down, or subjected to load rejection, steam coming from the heat recovery steam generator is recovered by blocking the first steam system and making the second steam system communicate with the heat recovery steam generator.

2. The advanced humid air gas turbine system according to claim 1 ,
wherein the heat recovery steam generator has a box-shaped casing, the casing having at a bottom portion thereof an inclined structure where inclination descends from upstream side toward downstream side of a flow of exhaust gas from the turbine, and
wherein a drain exhaust system is provided at a most-downstream-side portion of the bottom portion of the casing.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Takahashi Yoshitaka
• Sato Kazuhiko
• Takeda Yasushi

Classifications

• F02C3/30

  Adding water, steam or other fluids {for influencing combustion, e.g. to obtain cleaner exhaust gases (F02C7/141, F02C7/30, F01D21/00, F01K21/04, F23D11/10 take precedence)} · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F01K17/06

  Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant · CPC title

• F01K13/02

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

• F01K3/22

  Controlling, e.g. starting, stopping (F01K7/00, F01K13/02 take precedence) · CPC title