JP3238299B2 - gas turbine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine applied to a combined cycle and the like.

[0002]

2. Description of the Related Art Conventionally, in order to cool a gas turbine blade, a part of compressed air in a compressor is diverted and moved, and flows through a cooling air flow path formed in a stationary blade to form a blade head, a blade side, and the like. After cooling, the air flows out of the blades to join the main gas flow of the gas turbine, or moves from the compressor's intermediate cabin. The steam and turbine blades are cooled by using a semi-closed circuit that returns to the discharge cabin, or air is not used to reduce the amount of air for cooling the moving and stationary blades. A completely closed circuit that cools by directly passing through the moving and stationary blades is configured to perform steam cooling and the like.

[0003]

As described above, conventionally, the cooling air after cooling the moving and stationary blades of the gas turbine flows out of the blades and joins the main gas flow. Cannot recover the cooling air at all, and the entire amount is consumed. Since this consumed amount corresponds to 20% of the compressed air amount, the capacity of the compressor increases.

Further, when the air for cooling the dynamic and stationary blades is discharged outside the vehicle compartment, cooled and boosted through a cooler, a booster pump, etc., and returned to the vehicle interior again, a complete closed circuit is not formed. It does not always move outside the cabin and the stationary vane is cooled, and there is a doubt about the cooling effect, and it is inevitable that a part of the vane is consumed by merging with the flow of the main gas.

In the case of performing steam cooling by forming a closed circuit for cooling the steam by moving the steam directly into the stationary vanes, oxidation by steam, purging of steam remaining in the cooling passage, and leakage of high-pressure steam are performed. There are many issues.

[0006]

SUMMARY OF THE INVENTION A gas turbine according to the present invention has an object to solve the above-mentioned problems, and has a cooling system for cooling a vehicle.
After supplying gas and cooling through the stator vanes,
The first closed circuit that flows out and the supply of cooling gas to the vehicle interior
Cooling through the rotor blades and then taking it out of the passenger compartment
Circuit and the cooling gas in the first and second closed circuits.
It has a cooler to cool and a booster to pressurize and circulate.
The stationary vane and the cooling blade are not consumed without exhausting the cooling gas.
The blade is cooled.

[0007]

[0008]

That is, in the gas turbine according to the present invention,
Cooling gas was supplied into the cabin and cooled through the stator vanes
For cooling inside the first closed circuit and inside the vehicle, which is later taken out of the vehicle
After supplying gas and cooling through the rotor blades, take it out of the cabin.
The cooler cools the cooling gas in the second closed circuit
The booster is now pressurized and circulated
Cooling gas is exhausted only by circulating in a closed circuit.
The rotor blades and stator blades are cooled without being cooled.

[0009]

[0010]

FIG. 1 is an explanatory view of a gas turbine blade according to one embodiment of the present invention. In the figure, the gas turbine blade according to the present embodiment is a stationary blade and a moving blade of a gas turbine used in a combined cycle and the like. It is used. As shown in the figure, the structure is such that cooling air is circulated through the moving and stationary blades to cool these gas turbine blades, and the passage of the cooling air is communicated with a closed circuit. An air cooler 3 and a booster pump 4 are provided. In the figure, reference numeral 1 denotes a pipe for supplying cooling air for the stationary blades into the cabin of the gas turbine, 2 a pipe for taking out cooling air after cooling the stationary blades to the outside of the cabin, and 5 and 6 for cooling the moving blades. A pipe for guiding air into the vehicle interior and a double pipe, 7 an intermediate shaft cover of the gas turbine, 8 an air separator, 9 a disk, 10 a double pipe 6 passing through the inner diameter of the disk 9 after cooling the rotor blades.
The cooling air that is guided outside the vehicle compartment through the air cooler 3
Is a makeup line for performing makeup by supplementing cooling air from an intermediate stage or a final stage of the compressor of the gas turbine.

Cooling air for cooling the stationary blades is supplied from a pipe 1 into the interior of the gas turbine, passes through the one-stage, two-stage, and three-stage stationary blades in the direction indicated by the arrows, and is sequentially cooled. 2 and is taken out of the cabin. The high-temperature cooling air taken out of the cabin is introduced into the air cooler 3 and supplied with relatively low-temperature steam supplied from the steam turbine equipment in the combined cycle, or other air, water, or the like.
After being cooled by a fluid such as seawater, the pressure is increased by the booster pump 4 and circulates again in the vehicle interior.

The cooling air for cooling the moving blades is
And is guided into one side of the double pipe 6 into the vehicle interior in the direction of the arrow, enters the intermediate shaft cover 7, passes between the intermediate shaft cover 7 and the air separator 8, and passes through the small hole of the disk 9. Enter inside the moving blade to cool the moving blade. The cooling air that has cooled the moving blades again exits through the small holes of the disk 9 and passes through the next and subsequent stages of the moving blades to be cooled, passes through the inner diameter of the disk 9 in the direction indicated by the arrow, and passes through the double pipe 6. Is passed through the other side to the outside of the passenger compartment, enters the air cooler 3 through the pipe 10, and is cooled.

As described above, the flow of the cooling air circulates in a completely closed circuit, moves and cools the stationary blades, so that the cooling air is not consumed and the cooling air flows from the makeup line 11 at the time of makeup. It is only necessary to fill the working air. In addition,
Compressed air is supplied to the make-up line 11 as cooling air from an intermediate stage or a final stage of the compressor, and is supplemented.

Conventionally, the cooling air after cooling the moving and stationary blades of the gas turbine flows out of the blades and joins the main gas flow. In this case, the cooling air can be completely recovered. And the whole amount is consumed. Since this consumed amount corresponds to 20% of the compressed air amount, the capacity of the compressor increases. Also, the air for cooling the moving and stationary blades is taken out of the cabin and cooled and boosted through a cooler, booster pump, etc.
When returning to the cabin again, a complete closed circuit is not formed, so it does not always move out of the cabin and move, and the stator vanes are not necessarily cooled. It is inevitable that some parts will be consumed. In addition, when forming a closed circuit that cools steam by moving it directly into the stationary vanes and performing steam cooling, there are many problems such as oxidation by steam, purging of steam remaining in the cooling flow path, leakage of high-pressure steam, etc. There are issues. On the other hand, in the present gas turbine blade, in order to eliminate these drawbacks, the passage of the cooling air in the moving and stationary blades is formed so as to circulate in the blade without communicating with the outside of the blade. The moving and stationary blades are cooled by communicating with a closed circuit that supplies and recovers cooling air, and an air cooler 3 and a booster pump 4 that use steam or another fluid as a cooling medium are provided in the closed circuit. Since the cooling air circulates in a complete closed circuit, the cooling air can be moved without cooling air consumption and the stationary blades can be cooled, and the cooling method by air cooling can be used. In addition, many problems such as oxidation that occur when steam is cooled by moving the steam directly into the stationary vanes are not caused. In addition, the problem of the cooling effect in the semi-closed circuit and the problem that a part thereof is consumed can be solved. Further, the cooling air circulates only in the closed circuit and is not consumed, so that the thermal efficiency and performance in the combined cycle are improved.

[0015]

The gas turbine according to the present invention is constructed as described above, and the cooling gas circulates through the closed circuit and cools the moving blades and the stationary blades without being consumed. The capacity of a compressor or the like for supplying gas can be reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram of cooling air in a gas turbine blade according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Piping 3 Air cooler 4 Booster pump 5 Piping 6 Double piping 7 Intermediate shaft cover 8 Air separator 9 Disk 10 Piping 11 Makeup line

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02C 7/18

Claims (1)

(57) [Claims] 1. A cooling gas is supplied into a vehicle cabin and the inside of a vane is
A first closed circuit that is taken out of the cabin after cooling through
Cooling gas was supplied into the cabin and cooled through the rotor blades
A second closed circuit that is later taken out of the cabin;
A cooler and pressurizer for cooling the cooling gas in the second closed circuit
And a booster for circulating the cooling gas.
A gas turbine characterized in that the stationary blade and the moving blade are cooled without being worn .