Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Patent
1999-04-29
2000-10-10
Freay, Charles G.
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
60730, F02C 600
Patent
active
061288950
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP98/02801 filed Jun. 24, 1998.
TECHNICAL FIELD
The present invention relates to a device for steam cooling the combustor of a gas turbine which, in a combined plant in which a gas turbine and a steam turbine are combined, is capable of accurately controlling the temperature of the steam at planned temperatures even during periods of load change.
BACKGROUND ART
FIG. 7 is a schematic diagram of a plant having a gas turbine combustor which is subjected to steam cooling, in a combined plant in which a gas turbine and a steam turbine are combined. In the figure, a combustion gas 7, which is created as a result of power generation in gas turbine 1 and is discharged, is supplied to the boiler 4, and in boiler 4, steam 9 is generated by this high-temperature combustion gas 7 from the gas turbine 1, and the exhaust gas 50 is discharged to the atmosphere from smokestack 51. The steam 9, which is generated in the boiler 4, is supplied to steam turbine 5, and this turns a power generator, so that electric power is obtained. The cooling of the combustor of gas turbine 1 is conducted by extracting a portion of the steam produced by boiler 4 and conveying this steam 40 to the combustor, and the steam heated during this cooling process as recovered steam 41 is then reused by being returned to steam turbine 5.
Next, the control of the steam cooling for the gas turbine combustor in a combined plant having the structure described above will be explained.
FIG. 6 is a schematic flow diagram of a steamcooling system for gas turbine combustors in a conventional combined plant. In the figure, controller 2 controls the flow of the steam, while combustion gas from the gas turbine 1 is led to the boiler 4, which generates steam. Furthermore, this steam-cooling system is provided with an auxiliary steam source 3, a steam turbine 5, and a condenser 6. Steam recovery valve 11 is provided in the recovered steam flow path 61 from the outlet of the combustor of gas turbine 1. Furthermore, steam valve 12 is provided in extracted steam flow path 62 from the boiler 4 to the inlet of the combustor of gas turbine 1. Auxiliary steam valve 13 is provided in flow path 63 in order to introduce the steam from the auxiliary steam source 3 into the flow path 62 leading to the inlet of the combustor of gas turbine 1. The opening and closing of these valves 11 through 13 is controlled by the controller 2.
Furthermore, a temperature sensor 21, which detects the temperature of the steam flowing through the auxiliary steam flow path 63, a temperature sensor 22, which detects the temperature of the steam flowing into the inlet of the combustor of gas turbine 1, and a temperature sensor 31, which measures the temperature of the steam at the outlet of the combustor of gas turbine 1, are provided in the system, and the detected values detected by these temperature sensors are input into controller 2. In addition to the parts described above, an actual plant would be provided with a drain exhaust system, opening and closing valves, flow rate and pressure adjustment valves, pressure detectors, and the like; however, as these are not required for an explanation of the technological background of the present invention, an explanation thereof will be omitted here.
In a control system such as that described above, prior to supplying steam to the combustor of the gas turbine 1, the warming of the piping systems, and the discharge of the drain during operation, are conducted; however, those systems are omitted from the figures. Prior to starting, the auxiliary steam valve 13 is first opened, and auxiliary steam is allowed to flow into the auxiliary steam flow path 63 from auxiliary steam source 3, and this flows through the combustor of gas turbine 1 via flow path 62, and is discharged via a flush pipe which is not depicted in the figure, so that a warming up is conducted. Next, gas turbine 1 is started, and after a predetermined period of time, the auxiliary steam valve 13 is closed, while steam valve 12 and steam recovery val
REFERENCES:
patent: 4476674 (1984-10-01), Berman
patent: 5428950 (1995-07-01), Tomlinson et al.
patent: 5918466 (1999-07-01), Cloyd et al.
patent: 6003298 (1999-12-01), Horner
Hashimoto Yasuhiro
Kita Yoshinori
Takahama Masayuki
Tanaka Tomoka
Freay Charles G.
Mitsubishi Heavy Industries Ltd.
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