Gas turbine

• US 6,260,350 B1
• Filed: 06/29/1998
• Issued: 07/17/2001
• Est. Priority Date: 06/30/1997
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Hirose, Fumiyuki, Takehara, Isao, Murata, Hidetaro, Horii, Nobuyuki, Utamura, Motoaki, Sasada, Tetsuo, Kuwahara, Takaaki, Katoh, Yasuhiro
• Primary Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US09/106,077
• Time in Patent Office: 1,114 Days
• Field of Search: 60/393, 60/395.3
• US Class Current: 60/39.3
• CPC Class Codes: F02C 7/1435 by water injection
• CPC Class Codes: Y02E 20/16 Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Abstract

A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.

Claims

1. A gas turbine having a compressor for compressing air supplied thereto and discharging compressed air, a combustor for combusting the compressed air from said compressor and a fuel and a gas turbine to be driven by a combustion gas from said combustor, comprising:

a water injection unit, arranged at an upstream side of said compressor and constructed so that water droplets are sprayed into the air to be supplied to said compressor to lower the temperature of the air to be supplied into said compressor to a temperature lower than atmospheric temperature and the sprayed water droplets introduced into said compressor with the air having been lowered in temperature are evaporated during passage through said compressor;

a first detection unit for detecting the humidity of air to be supplied to said compressor;

a second detection unit for detecting the humidity of air discharged from said compressor; and

a controlling unit for calculating, from a difference between a humidity detected by said first detection unit and a humidity detected by said second detection unit, a quantity of water droplets to be sprayed and evaporated, which cool air to be introduced into said compressor and are introduced into said compressor, during flow of said water droplets through said compressor and controlling a quantity of water to be sprayed from said water injection unit on the basis of a result of the calculation.

2. A gas turbine having a compressor for compressing air supplied thereto and discharging compressed air, a combustor for combusting the compressed gas from said compressor and a fuel and a gas turbine to be driven by a combustion gas from said combustor, comprising:

a water injection unit, arranged at an upstream side of said compressor and constructed so that water droplets are sprayed into the air to be supplied to said compressor to lower the temperature of the air to be supplied into said compressor to a temperature lower than atmospheric temperature and the sprayed water droplets introduced into said compressor with the air having been lowered in temperature are evaporated during passage through said compressor;

a first detection unit for detecting the humidity of air on the upstream side of said injection unit;

a second detection unit for detecting the humidity of air discharged from said compressor;

a third detection unit arranged between said water injection unit and an inlet of said compressor, and detecting the humidity of the air into which water droplets are sprayed from said water injection unit; and

a controller unit for calculating, from a difference between the humidity detected by said second detection unit and the humidity detected by said third detection unit, a quantity of water droplets to be sprayed and evaporated, which cool air to be introduced into said compressor and are introduced into said compressor, during flow of said water droplets through said compressor and controlling the amount of water droplets to be sprayed from said water injection unit on the basis of a result of the calculation.

3. A gas turbine having a compressor for compressing air supplied thereto and discharging compressed air, a combustor for combusting the compressed gas from said compressor and a fuel and a gas turbine to be driven by a combustion gas from said combustor, comprising:

a water injection unit, arranged at an upstream side of said compressor and constructed so that water droplets are sprayeed into the air to be supplied to said compressor to lower the temperature of the air to be supplied into said compressor to a temperature lower than atmospheric temperature and the sprayed water droplets introduced into said compressor with the air having been lowered in temperature are evaporated during passage through said compressor;

a temperature detection unit at an upstream side of said water injection unit, for detecting the temperature of air to be supplied to said compressor;

a first detection unit for detecting the humidity of air at an upstream side of said injection unit;

a second detection unit for detecting the humidity of air discharged from said compressor;

a third detection unit arranged between said injection unit and an inlet of said compressor, for detecting the air into which water droplets are sprayed from said water injection unit; and

a controlling unit for calculating, from a difference between the humidity detected by said second detection unit and the humidity detected by said third detection unit, a quantity of water droplets to be sprayed and evaporated, which cool air to be introduced into said compressor and are introduced into said compressor, during flow of said water droplets through said compressor, and controlling the quantity of water droplets to be sprayed from said water injection unit so as to come within a limit value termined by the temperature and humidity of atmospheric air and affecting operation of said combustor by a quantity of humidity of the air into which water droplets have been sprayed by said water injection unit.