Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Patent
1999-09-23
2000-12-26
Thorpe, Timothy S.
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
F02C 618
Patent
active
061640565
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a combined cycle electric power generating plant composed of a gas turbine plant and a steam turbine plant.
DESCRIPTION OF THE RELATED ART
A combined cycle electric power generating plant is an electric power generating system which is composed of a gas turbine plant and a steam turbine plant. In this system, the gas turbine plant is operated so as to use a high temperature range of thermal energy and the steam turbine plant is operated to use a low temperature range of the thermal energy, so that the thermal energy is efficiently recycled. Therefore, this electric power generating system has attracted much interest recently.
In this combined cycle electric power generating plant, research and development of the plant are directed to raising the temperature of the high temperature area of the gas turbine, as one point for improving the efficiency.
Meanwhile, a cooling system is necessary for the high temperature area, in consideration of the heat resistance of the turbine structure, and air is conventionally used as a coolant of the cooling system.
However, in case of using air as the coolant, power loss is caused by the compression of the air which is used for cooling by the air-compressor of the system, to achieve the required pressure. Furthermore, the energy level of the gas decreases due to a decrease of the average gas temperature, because the air which is used as the coolant for the parts is mixed with the gas at high temperature in a flow line of the turbine. Therefore, even if a high temperature area is formed using air as the coolant, further improvements in the heat efficiency cannot be expected for the reasons as described above.
To overcome the above problems and to achieve further improvements of the heat efficiency, a cooling system using steam as the coolant instead of air has been proposed.
This type of cooling system is disclosed in Japanese Patent Application, First Publication, No. Hei5-163960, for example. However, this cooling system has many problems which have to be overcome in its details, although it discloses the concept of using steam as the coolant.
For example, purging of the air which remains in the steam cooling system and warming-up of the system after the purge are necessary at the start of the gas turbine, and these processes are performed by the steam which is supplied by the auxiliary steam system in the above disclosed Japanese Patent Application.
The steam supplied by the auxiliary steam system in the above mentioned processes is finally exhausted to the outside of the system. However, there is no consideration of the concrete exhaust method of the steam in the above Japanese Patent Application. Thus, the art of the steam cooling is still at the stage of trial and error, and the conventional art which is based on the purging of the drain in the steam cooling system and the warming-up of the system after the purge at the start of the gas turbine remains incomplete.
Furthermore, in the conventional steam cooling system, the steam supplied by the auxiliary steam system is used for purging of the air which remains in the cooling steam system, and after that, the warm-up is performed, as disclosed above. However, no consideration or countermeasures are proposed for noise which is produced by the exhaust of the steam to the outside of the system during the warm-up process.
Namely, the noise produced by the exhaust of the steam cannot be obviated. However, providing a funnel or a silencer or the like to reduce the noise is not preferable in view of space and cost.
SUMMARY OF THE INVENTION
The present invention was conceived in consideration of the above-described problems, and has as its objective the provision of a method to effectively reduce the noise produced by the exhaust of the steam in the warm-up process or the like.
The present invention was achieved to overcome the above-stated problems. A combined cycle electric power generating plant of the present invention is composed of a gas turbine plant and a s
REFERENCES:
patent: 4424668 (1984-01-01), Mukherjee
patent: 5613356 (1997-03-01), Frutschi
patent: 5979156 (1999-11-01), Uematsu et al.
Yamamoto Hiroyuki
Yasuraoka Jun
Gartenberg Ehud
Mitsubishi Heavy Industries Ltd.
Thorpe Timothy S.
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