Gas turbine and operating method thereof

• US 9,255,490 B2
• Filed: 09/24/2009
• Issued: 02/09/2016
• Est. Priority Date: 10/08/2008
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.), Tohoku Electric Power Company Incorporated
• Original Assignee: Mitsubishi Heavy Industries, Ltd., Tohoku Electric Power Company Incorporated
• Inventors: Mizukami, Satoshi, Ishiguro, Tatsuo, Masada, Junichiro, Takata, Kazumasa, Fukunaga, Yuya, Takahashi, Hiroki, Satoh, Masaki, Nishimura, Yoshiaki, Oogai, Norio, Hasegawa, Souji, Hayashi, Masato
• Primary Examiner(s): SUTHERLAND, STEVEN M
• Application Number:
  US13/056,064
• Publication Number:
  US 20110138818A1
• Time in Patent Office: 2,329 Days
• Field of Search: 607/82, 607/83, 607/85, 607/95, 608/06, 60/398.3, 607/78, 607/86
• US Class Current: 1/1
• CPC Class Codes: F01D 11/24 by selectively cooling-heating stator or rotor components
• 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: F02C 7/08 Heating air supply before combustion, e.g. by exhaust gases
• CPC Class Codes: F02C 7/12 Cooling of plants of component parts, see the relevant subclasses, e.g. F01D; cooling of engines in general F01P
• CPC Class Codes: F02C 7/18 the medium being gaseous, e.g. air F02C7/125 takes precedence
• CPC Class Codes: F05D 2260/205 Cooling fluid recirculation, i.e. after cooling one or more components is the cooling fluid recovered and used elsewhere for other purposes
• CPC Class Codes: F05D 2260/608 Aeration, ventilation, dehumidification or moisture removal of closed spaces

Abstract

Provided is a gas turbine capable of achieving high-speed startup of the gas turbine through quick operation control of an ACC system during startup of the gas turbine, improving the cooling efficiency of turbine stationary components, and quickly carrying out an operation required for cat back prevention during shutdown of the gas turbine. Included are a pressurizing device (40) connected to a branching channel (42) branching from the discharge side of a compressor (11) and capable of carrying out an operation for introducing and pressurizing air independently from the compressor (11); a temperature-control-medium supply channel (43) that guides compressed air pressurized at the pressuring device (40) to a turbine-cooling-medium channel (50) provided in stationary components of a turbine (13); and a temperature-control-medium return channel (44) that guides the compressed air that has passed through the turbine-cooling-medium channel (50) to the discharge side of the compressor (11) such that the flows are combined, and the pressurizing device (40) is operated at startup of the gas turbine and in preparation immediately before startup to carry out temperature-raising and cooling by letting the compressed air flow in the turbine-cooling-medium channel (50). The pressurizing device (40) is operated during shutdown of the gas turbine to exhaust the high-temperature gas remaining in the turbine (13).

Claims

1. A startup operating method for a gas turbine that supplies combustion gas generated by supplying fuel to a combustor where the fuel is combusted with compressed air compressed at a compressor to a turbine to acquire rotational power and that has an active clearance control ACC system, the method, which is carried out at startup of the gas turbine and in preparation immediately before startup, comprising:

a step in which pressurizing means, which is connected to a branching channel branching from a discharge-side channel of the compressor and capable of operating independently from the compressor, introduces and pressurizes a temperature-control medium;

a step in which the pressurized temperature-control medium pressurized at the pressurizing means is supplied to a turbine-cooling-medium channel provided in a stationary component of the turbine to raise the temperature of the stationary component with the pressurized temperature-control medium passing through the turbine-cooling-medium channel; and

a step in which the pressurized temperature-control medium is guided from the turbine-cooling-medium channel to the discharge-side channel such that the flows are combined.

2. The startup operating method for a gas turbine according to claim 1, wherein the pressurized temperature-control medium is guided to a blade ring of the turbine.