JPH08284687A - Gas turbine - Google Patents

Abstract

PURPOSE: To cool moving blades and stationary blades without raising and lowering cooling gas so as to minimize a compressor and so on, by providing a first closing circuit by which the cooling base substance is taken out to the outside of a turbine chamber after it cools the inside of the stationary blades by being passed therethrough, and a second closing circuit by which the cooling base substance is taken out to the outside of the turbine chamber after it cools the inside of the moving blades by being passed therethrough. CONSTITUTION: Cooling air to cool stationary blades is taken out to the outside of a turbine chamber through a pipeline 2 after being supplied from a pipeline 1 to the inside of the gas turbine chamber and passed through an arrow direction so as to sequentially cool respective first to third stage stationary blades. The high temperature cooling air taken out to the outside of the turbine chamber is introduced to an air cooler 3, and the pressure of the high temperature cooling air is raised by a booster pump 4 after being cooled and circulated inside the turbine chamber again. Cooling air to cool moving blades is introduced to the inside of the turbine chamber by being led on one side of a pipeline 5 and a double pipeline 6, passed between an intermediate shaft cover 7 and an air separator 8, and introduced inside the moving blades so as to cool them. After that, the cooling air is taken out from the narrow hole of a disc 9 and utilized for cooling a next stage moving blade.

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 to move and flow into a flow path of cooling air formed in a stationary blade to generate a blade head, blade side, etc. After cooling, the air flows out of the blade and joins with the main gas flow of the gas turbine, or it moves from the intermediate compartment of the compressor, and the air for cooling the stationary blades is extracted outside the compartment and cooled by a cooler before it is boosted by a booster pump. A quasi-closed circuit that cools the moving blades and the stationary blades and then returns them to the discharge vehicle interior again, or does not use air to reduce the amount of air for cooling the moving blades and the stationary blades. For example, steam is cooled by constructing a completely closed circuit that directly cools the moving and stationary blades.

[0003]

As described above, conventionally, the cooling air after cooling the moving and stationary blades of the gas turbine is caused to flow out of the blade and join with the main gas flow. Is unable to collect any cooling air and is totally consumed. Since this consumed amount corresponds to 20% of the compressed air amount, the capacity of the compressor becomes large.

In addition, when the air for cooling the moving and stationary blades is drawn out of the vehicle compartment, cooled and boosted through a cooler, a booster pump, etc., and then returned to the vehicle interior, a complete closed circuit is not formed. It is not always the case that the vanes move out of the cabin again and the vanes are cooled, and the cooling effect is questionable, and it is inevitable that part of the vanes will be consumed by joining the main gas flow.

Further, when steam is cooled by forming a closed circuit for moving the steam and directly passing it through the stator vanes to cool it, oxidation by steam, purging of steam remaining in the cooling passage, leakage of high-pressure steam There are many challenges.

[0006]

A gas turbine according to the present invention is intended to solve the above-mentioned problems, and a first aspect of the invention is to supply a cooling gas into the vehicle compartment, cool it through the vanes, and then take it out of the vehicle compartment. A closed circuit, a second closed circuit that supplies cooling gas into the vehicle compartment, cools it through the moving blades, and then takes it out of the vehicle compartment, and cooling that cools the cooling gas in the first and second closed circuits. It is characterized by a configuration including a container and a booster for pressurizing and circulating.

In the gas turbine according to the present invention, the cooling gas is supplied to the vehicle interior, and the first closed circuit is taken out to the outside of the vehicle after cooling the gas through the stationary vanes and supplying the cooling gas to the vehicle interior. A second closed circuit that is taken out of the vehicle after being cooled through the moving blades, a cooler that cools the cooling gas in the first and second closed circuits, and a booster that circulates by pressurizing the steam; It is characterized in that it is incorporated in a combined plant with a turbine and steam is supplied from the steam turbine to the cooler as a cooling medium.

[0008]

That is, in the gas turbine according to the present invention,
Cooling gas is supplied to the passenger compartment, cooled through the vanes and then taken out of the passenger compartment.First, the cooling gas is supplied to the closed circuit and inside the passenger compartment, cooled through the moving blades, and then taken out of the passenger compartment. The cooling gas inside the second closed circuit is cooled by the cooler, and the booster pressurizes and circulates the cooling gas. Cool the vanes.

Further, in the gas turbine according to the present invention, the cooling gas is supplied to the first closed circuit and to the inside of the vehicle which are taken out of the vehicle after being supplied to the inside of the vehicle by cooling the gas through the vanes. After cooling through the rotor blades and then cooling it to the outside of the passenger compartment, the cooling gas inside the second closed circuit is cooled by the cooler, pressurized by the booster and circulated, and installed in the combined plant with the steam turbine to The steam is supplied to the cooler as a cooling medium, and the cooling gas circulates in the closed circuit to cool the moving blades and the stationary blades without being consumed. Moreover, the thermal efficiency and performance in the combined cycle in which the gas turbine is incorporated are improved.

[0010]

1 is an explanatory view of a gas turbine blade according to an 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 gas turbine of this blade is a combined cycle in which gas turbine equipment and steam turbine equipment are combined. in use. As shown in the figure, in order to cool these gas turbine blades, the structure is such that the cooling air circulates through the moving and stationary blades, and the passage of this cooling air is connected to a closed circuit. An air cooler 3 and a booster pump 4 are provided. In the figure, reference numeral 1 is a pipe for supplying the cooling air for the stationary blades into the vehicle interior of the gas turbine, 2 is a piping for taking out the cooling air after cooling the stationary blades to the outside of the vehicle compartment, and 5 and 6 are for cooling the moving blades. Piping and double piping for introducing air into the vehicle compartment, 7 is an intermediate shaft cover of the gas turbine, 8 is an air separator, 9 is a disk, and 10 is a double piping that passes through the inner diameter of the disk 9 after cooling the moving blades.
The air for cooling that is guided to the outside of the vehicle through the air cooler 3
Reference numeral 11 is a makeup line for replenishing the cooling air from the intermediate stage or the final stage of the compressor of the gas turbine to make up makeup.

Cooling air for cooling the stationary vanes is supplied from the pipe 1 into the vehicle interior of the gas turbine to sequentially cool the stationary vanes of the first stage, the second stage and the third stage in the directions shown by the arrows, and then the pipes. It passes through 2 and is taken out of the passenger compartment. The high-temperature cooling air taken out of the passenger compartment is introduced into the air cooler 3 and supplied with the relatively low-temperature steam 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, it is boosted by the booster pump 4 and circulates in the vehicle interior again.

The cooling air for cooling the moving blades is provided by the pipe 5.
And is guided to one side of the double pipe 6 in the direction of the arrow in the vehicle compartment, enters the intermediate shaft cover 7, passes between the intermediate shaft cover 7 and the air separator 8, and passes through the narrow hole of the disc 9. Enter the rotor blade to cool the rotor blade. The cooling air, which has cooled the moving blades, again exits from the narrow holes of the disk 9 and cools through the moving blades of the next and next steps, and then passes through the inner diameter of the disk 9 in the direction indicated by the arrow to form the double pipe 6 Is guided to the outside of the vehicle compartment through the other side of the air conditioner, passes through the pipe 10, and enters the air cooler 3 for cooling.

As described above, the flow of the cooling air circulates in a completely closed circuit to cool the stationary blades, so that the cooling air is not consumed and is cooled from the makeup line 11 during makeup. All you need to do is fill the air for use. In addition,
The makeup line 11 is supplied with compressed air as cooling air from the middle stage or the final stage of the compressor and is replenished.

Conventionally, the cooling air after cooling the moving and stationary blades of the gas turbine is caused to flow out of the blade and join with the main gas flow. In this case, the cooling air can be completely recovered. No, all is consumed. Since this consumed amount corresponds to 20% of the compressed air amount, the capacity of the compressor becomes large. In addition, the air for moving and stationary blade cooling is drawn out of the passenger compartment and cooled and boosted through a cooler and a booster pump.
When it is returned to the passenger compartment, a complete closed circuit is not formed, so it does not always come out of the passenger compartment to move, and the vanes are not always cooled.There is a doubt about the cooling effect and it joins the main gas flow. It is inevitable that some of them will be consumed. Further, when steam is cooled by forming a closed circuit for cooling the steam by moving the steam directly through the stator vanes, oxidation by steam, purging of steam remaining in the cooling passage, leakage of high-pressure steam, etc. There are challenges. On the other hand, in this gas turbine blade, in order to eliminate these drawbacks, a passage for cooling air in the moving and stationary blades is formed so as to circulate inside the blade without communicating with the outside of the blade, and this passage is formed. An air cooler 3 and a booster pump 4 which use steam or another fluid as a cooling medium are provided in this closed circuit for moving and cooling the stationary blades by communicating with a closed circuit for supplying and collecting cooling air. Therefore, by circulating the cooling air in a completely closed circuit, the cooling air can be moved and the stationary blades can be cooled without exhaustion of the cooling air, and the cooling method by air cooling can be utilized as it is. Also, many problems such as oxidation that occur when steam is moved and cooled by directly passing through the stationary blade are not caused. Further, the question of the cooling effect in the quasi-closed circuit and the problem such as partial exhaustion are solved. Further, since the cooling air circulates only in the closed circuit and is not consumed, 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 in the closed circuit and cools the moving blades and the stationary blades without being consumed. It is possible to reduce the capacity of a compressor that supplies gas.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Piping 2 Piping 3 Air Cooler 4 Booster Pump 5 Piping 6 Duplex Piping 7 Intermediate Shaft Cover 8 Air Separator 9 Disk 10 Piping 11 Makeup Line

Claims (2)

[Claims] 1. A first closed circuit for supplying a cooling gas into a vehicle compartment, cooling the gas through the inside of the vanes, and then taking the air out of the vehicle compartment,
A second closed circuit that supplies cooling gas into the vehicle compartment and cools it through the moving blades and then takes it out of the vehicle compartment; and a cooler that cools the cooling gas in the first and second closed circuits. A gas turbine having a booster for circulating the gas turbine. 2. The steam turbine is incorporated into a combined plant, and steam is supplied from the steam turbine to the cooler as a cooling medium.
The gas turbine described in 1.