Power plants – Combustion products used as motive fluid – Combustion products generator
Reexamination Certificate
2000-04-17
2001-10-16
Freay, Charles G. (Department: 3746)
Power plants
Combustion products used as motive fluid
Combustion products generator
Reexamination Certificate
active
06301897
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a gas turbine suction air-cooling system for cooling the air to be drawn into a gas turbine.
2. Description of the Related Art
Generally, a gas turbine suction air-cooling coil is formed as a single line, and therefore chilled water of a single temperature is supplied to the suction air-cooling coil so as to cool the suction air.
Such a construction is disclosed, for example, in Japanese Patent Unexamined Publication No. 2-78736.
Recently, in view of an advantage that waste heat of a gas turbine can be used as a drive source, countermeasures for dealing with a power consumption peak in the summer season, and the protection of the earth environment, absorption chillers have been more and more used as a source of supply of chilled water for cooling suction air in order to enhance the efficiency of the gas turbine. However, an absorption chiller uses water as a heating medium therein, and the operation in the chiller is effected at a pressure below the atmospheric pressure, and therefore, generally, the absorption chiller is larger in size than a mechanical-type chiller, and therefore has been required to be formed into a compact design, and also a higher efficiency of the overall system has been required. Furthermore, an air cooler itself has been eagerly required to have a compact design.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a gas turbine suction air cooling system which has a compact design, and achieves a high efficiency.
According to one aspect of the present invention, there is provided a gas turbine suction air cooling system comprising a gas turbine, a suction air cooler for cooling the outside air to be drawn into the gas turbine, an air-cooling coil for feeding chilled water so as to cool the outside air drawn into the suction air cooler, and absorption chillers for feeding the chilled water to the air-cooling coil; in which
the air-cooling coil is divided into a plurality of coil lines; and the air-cooling coil line, disposed closest to the outside air, is connected to the absorption chiller for feeding the chilled water of highest temperature, whereas the other air-cooling coil line, disposed closest to the gas turbine, is connected to that absorption chiller for feeding the chilled water of lowest temperature.
According to another aspect of the invention, there is provided a gas turbine suction air cooling system comprising a gas turbine, a suction air cooler for cooling the outside air to be drawn into the gas turbine, an air-cooling coil for feeding chilled water so as to cool the outside air drawn into the suction air cooler, absorption chillers for feeding the chilled water to the air-cooling coil, and means for feeding chilled water to absorbers and condensers of the absorption chillers; in which
the air-cooling coil is divided into a plurality of air-cooling coil lines; and the air-cooling coil line, disposed closest to the outside air, is connected to the absorption chiller for feeding the chilled water of highest temperature, whereas the other air-cooling coil line, disposed closest to the gas turbine, is connected to that absorption chiller for feeding the chilled water of lowest temperature; and the chilled water is caused to flow in series to the absorption chiller for feeding the chilled water of the lowest temperature and the absorption chiller for feeding the chilled water of the highest temperature.
According to a further aspect of the invention, there is provided a gas turbine suction air cooling system comprising a gas turbine, a suction air cooler for cooling the outside air to be drawn into the gas turbine, an air-cooling coil for feeding chilled water so as to cool the outside air drawn into the suction air cooler, absorption chillers for feeding the chilled water to the air-cooling coil, and means for feeding chilled water to absorbers and condensers of the absorption chillers; in which
the air-cooling coil is divided into a plurality of air-cooling coil lines; and the air-cooling coil line, disposed closest to the outside air, is connected to that absorption chiller for feeding the chilled water of highest temperature, whereas the other air-cooling coil line, disposed closest to the gas turbine, is connected to the absorption chiller for feeding the chilled water of lowest temperature; and the chilled water is caused to flow in parallel to the absorption chiller for feeding the chilled water of the lowest temperature and the absorption chiller for feeding the chilled water of the highest temperature.
With the above construction, the following operation is achieved.
The gas turbine suction air-cooling coil is divided into a plurality of (for example, two) coil lines, and the absorption chiller for supplying higher-temperature cooling chilled water (for example, of 9° C.) is connected to the coil line disposed close to the outside air, whereas the absorption chiller for supplying lower-temperature cooling chilled water (for example, of 6° C.) is connected to the coil line disposed close to the suction air of the gas turbine. With this construction, an evaporation temperature within an evaporator of the absorption chiller (which feeds the higher-temperature chilled water), connected to the coil line disposed close to the outside air, is higher than an evaporation temperature of an evaporator of the absorption chiller (which feeds the lower-temperature chilled water) connected to the coil line disposed close to the suction air of the gas turbine, and therefore a temperature difference, required for absorbing heat, is smaller in the former absorption chiller. Therefore, the former absorption chiller can be made smaller in size and higher in efficiency than the latter absorption chiller connected to the coil disposed close to the suction air of the gas turbine.
The suction air-cooling coil is divided into a plurality of coil lines, and the cooling chilled water of higher temperature is fed to the coil line disposed at the air inlet side (i.e, the higher-temperature side) whereas the cooling chilled water of lower temperature is fed to the coil line disposed at the air outlet side (i.e., the lower-temperature side), and by doing so, the heat exchange between the air and the cooling chilled water can be effected in a counterflow manner, and therefore the overall construction of the cooling coil can be made small.
In the present invention, a predetermined amount of air is cooled to a predetermined temperature, using the suction air-cooling coil and the chiller each of which is divided into not less than two, and with this construction, the suction air cooling system of the invention can be reduced in overall construction, and can achieve a higher efficiency as compared with the type of system in which one coil and one chiller are used.
REFERENCES:
patent: 5444971 (1995-08-01), Hollenberger
patent: WO 97/09578 (1997-03-01), None
Antonelli Terry Stout & Kraus LLP
Freay Charles G.
Gartenberg Ehud
Hitachi , Ltd.
LandOfFree
Gas turbine suction air-cooling system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas turbine suction air-cooling system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas turbine suction air-cooling system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2570428