Advanced humid air gas turbine system

• US 9,677,471 B2
• Filed: 11/10/2014
• Issued: 06/13/2017
• Est. Priority Date: 11/11/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Takahashi, Yoshitaka, Sato, Kazuhiko, Takeda, Yasushi
• Primary Examiner(s): Sung, Gerald L
• Assistant Examiner(s): THOMAS, KYLE ROBERT
• Application Number:
  US14/537,155
• Publication Number:
  US 20150128559A1
• Time in Patent Office: 946 Days
• CPC Class Codes: F01D 19/00 Starting of machines or engines; Regulating, controlling, or safety means in connection therewith warming-up before starting F01D25/10; turning or inching gear F01D25/34
• CPC Class Codes: F01D 19/02 dependent on temperature of component parts, e.g. of turbine-casing
• CPC Class Codes: F01D 21/00 Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
• CPC Class Codes: F01D 21/12 responsive to temperature
• CPC Class Codes: F01D 21/14 responsive to other specific conditions
• CPC Class Codes: F01K 11/00 Plants characterised by the engines being structurally combined with boilers or condensers
• CPC Class Codes: F01K 13/02 Controlling, e.g. stopping or starting
• CPC Class Codes: F01K 17/04 for specific purposes other than heating F01K17/06 takes precedence
• CPC Class Codes: F01K 17/06 Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
• CPC Class Codes: F01K 19/00 Regenerating or otherwise treating steam exhausted from steam engine plant F01K3/006 takes precedence plants characterised by use of means for storing steam in an alkali to increase steam pressure F01K5/00; returning condensate to boiler F22D
• CPC Class Codes: F01K 23/10 with exhaust fluid of one cycle heating the fluid in another cycle F01K17/025 takes precedence
• CPC Class Codes: F01K 3/22 Controlling, e.g. starting, stopping F01K7/00, F01K13/02 take precedence
• CPC Class Codes: F02C 3/04 having a turbine driving a compressor power transmission arrangements F02C7/36; control of working fluid flow F02C9/16
• CPC Class Codes: F02C 3/30 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 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 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: F05D 2210/12 gaseous, i.e. compressible
• CPC Class Codes: F05D 2210/20 Properties
• CPC Class Codes: F05D 2220/32 in gas turbines

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.

Claims

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.