JP2003293790A - Stack and gas turbine equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stack capable of withstanding a high temperature without using an expensive material such as a heat resisting steel. <P>SOLUTION: In this stack 11 capable of withstanding a high temperature without using an insulation and an expensive material such as a heat resisting steel, an outer tube 13 is disposed on the outside of a tubular body 12, a cooling fan 15 to force-feed air is installed between the body 12 and the outer tube 13, and air is circulated to a cooling passage 14 by the cooling fan 15 for cooling the air. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chimney that emits high-temperature exhaust gas from a gas turbine and a gas turbine facility equipped with this chimney.

[0002]

2. Description of the Related Art From the viewpoint of effective use of energy resources and economic efficiency, power generation facilities (power generation plants) are being improved in efficiency in addition to simple cycles. One of them is a turbine power plant (combined power plant) that combines a gas turbine and a steam turbine. In the combined cycle power plant, the high-temperature exhaust gas from the gas turbine is sent to the exhaust heat recovery boiler, steam is generated in the exhaust heat recovery boiler via the superheater unit, and the generated steam is sent to the steam turbine and sent to the steam turbine. I am supposed to work.

In an integrated power plant, when the exhaust heat recovery boiler and the steam turbine are inspected, the gas turbine may be operated independently to continue power generation, and the flow of exhaust gas to the exhaust heat recovery boiler is cut off. The exhaust gas from the gas turbine is then discharged from the chimney. Since the exhaust gas of the gas turbine has a high temperature (for example, 600 ° C or higher), the chimney is configured to withstand the high temperature.

A conventional chimney for discharging exhaust gas from a gas turbine has a structure in which an insulation is attached to the inside of a steel body to endure high temperatures, and an outside of the body of heat-resistant steel (chromium, molybdenum steel, etc.). It has a structure that can withstand high temperatures by forming air passages and cooling by natural convection.

[0005]

In the conventional chimney which discharges the exhaust gas of the gas turbine, the high temperature exhaust gas is dealt with by attaching insulation or using a heat-resistant steel body. Expensive materials such as aeration and heat resistant steel are required, and the height is 40m or more.
Since the length is 80 m, the current cost is high. There are also power plants equipped with a plurality of gas turbines, and a plurality of chimneys are installed for each gas turbine, which further increases the cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a chimney capable of cooling a steel material and withstanding high temperatures at low cost, and a gas turbine facility equipped with this chimney.

[0007]

The structure of the present invention for achieving the above object is a chimney for discharging exhaust gas of a gas turbine, in which an outer cylinder is arranged outside a cylindrical main body and A feature is that a cooling fan for pushing air is provided between the outer cylinders, and the air is circulated between the main body and the outer cylinder by the cooling fan.

Further, the structure of the present invention for achieving the above object is a chimney for discharging exhaust gas of a gas turbine, in which an outer cylinder is arranged outside a cylindrical main body, and the upper end of the main body is provided. A ring member is rotatably provided, a vane member arranged inside the main body is attached to the ring member, a fin arranged outside the main body is attached to the ring member, and the ring member is rotated by the exhaust air through the vane member. The fins cause air flow between the main body and the outer cylinder.

The main body is made of steel, and the outer cylinder is made of stainless steel or aluminum.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a power plant (gas turbine equipment) equipped with a chimney according to a first embodiment of the present invention.
The schematic configuration of the main part of FIG.

As shown in the figure, the gas turbine 4 is provided with a compressor 1 and a combustor 2, and the compressor 1 and the gas turbine 4 are coaxially provided. Air is supplied to the compressor 1, and the compressed air compressed by the compressor 1 is converted into combustion gas by the combustor 2 and expanded by the gas turbine 4.

The high-temperature exhaust gas that has finished its work in the gas turbine 4 is sent from the exhaust gas passage 5 to the exhaust heat recovery boiler 6.

A cutoff means 7 is provided in the exhaust gas passage 5, and a chimney 11 for discharging high-temperature exhaust gas that has finished work in the gas turbine 4 has a silencer 12 in the exhaust gas passage 5 upstream of the cutoff means 7. It is provided through.

The chimney 11 is constructed by arranging an outer cylinder 13 made of stainless steel or aluminum on the outside of a cylindrical main body 12 made of steel. A cooling air passage 14 is provided between the main body 12 and the outer cylinder 13. Has been formed. A cooling fan 15 for pushing cooling air into the cooling air passage 14 is provided below the chimney 11, and when hot exhaust gas is sent to the chimney 11, air is forcibly forced from the cooling fan 15 into the cooling air passage 14. Sent.

In the power plant having the chimney 11 having the above structure, the shut-off means 7 is opened during normal operation, and the high-temperature exhaust gas from the gas turbine 4 is sent to the exhaust heat recovery boiler 6. When the exhaust gas heat recovery boiler and the steam turbine side are inspected, when the gas turbine 4 is operated independently to continue power generation, the shut-off means 7 is closed and the hot exhaust gas is transferred to the chimney 11
Emitted from. When the high-temperature exhaust gas is discharged from the chimney 11, the cooling fan 15 sends air to the cooling air passage 14 to cool the chimney 11. When the high-temperature exhaust gas is discharged from the chimney 11, the cooling fan 15 sends air to the cooling air passage 14 for cooling, so that even the inexpensive steel main body 12 withstands sufficiently high temperatures. It can be the chimney 11.

In the power generation plant described above, the chimney 11 that can withstand high temperatures can be constructed without using expensive materials such as insulation and heat resistant steel, and the cost can be significantly reduced.

A second embodiment of the present invention will be described with reference to FIGS.

FIG. 2 is a schematic configuration of a main part of a power plant (gas turbine equipment) having a chimney according to a second embodiment of the present invention, FIG. 3 is a perspective view of the top of the chimney, and FIG. The view taken along the line IV-IV in FIG. 3 is shown. The same members as those shown in FIG. 1 are designated by the same reference numerals, and duplicate description is omitted.

As shown in FIG. 2, a chimney 21 is provided in the exhaust gas passage 5 on the upstream side of the shut-off means 7 through the silencer 12 for discharging the high-temperature exhaust gas that has finished working in the turbine 4. The chimney 21 is a tubular body 2 made of steel.
An outer cylinder 23 made of stainless steel is arranged outside of 2, and a cooling air passage 24 is formed between the main body 22 and the outer cylinder 23.

As shown in FIGS. 2 to 4, a ring member 25 is rotatably supported on the main body 22 at the upper end of the chimney 21. That is, as shown in FIG. 4, the ring member 25 has a U-shaped cross section in a state of straddling the upper end of the main body 22,
A bearing member 28 is provided between the upper end of the main body 22 and the ring member 25.
Is intervening. The ring member 25 is provided with blade members 26 arranged inside the main body 22, and the ring member 25 is provided with fins 27 arranged outside the main body 22 (on the cooling air passage 24 side). When the high-temperature exhaust gas is sent to the chimney 21, the exhaust gas rotates the ring member 25 via the blade member 26, and the fins 27 generate a suction force in the cooling air passage 24 to generate the main body 22 and the outer cylinder 23.
There is a flow of air between.

In the combined cycle power plant having the chimney 21 having the above-described structure, the high-temperature exhaust gas from the turbine 4 is sent to the exhaust heat recovery boiler 6 when the shut-off means 7 is opened during normal operation. When operating the turbine 4 independently to continue power generation when inspecting the exhaust heat recovery boiler or steam turbine side,
The shut-off means 7 is closed and the hot exhaust gas is discharged from the chimney 21. When the high-temperature exhaust gas is discharged from the chimney 21, the ring member 25 is rotated by the exhaust gas via the blade members 26, and the fins 27 generate a suction force in the cooling air passage 24 to cause the main body 22 and the outer cylinder 23. A flow of air is generated during this period, and the chimney 21 is cooled.

When the hot exhaust gas is discharged from the chimney 11, the rotation of the ring member 25 sucks the air in the cooling air passage 24 to allow the air to flow and thus cool the steel body 22. However, it is possible to make the chimney 21 sufficiently resistant to high temperatures. Also,
No power is required to circulate the cooling air.

In the above-described power plant, the chimney 21 can be constructed without using expensive materials such as insulation and heat-resistant steel, and without requiring power for circulating the cooling air. Can be significantly reduced.

[0024]

The chimney of the present invention is a chimney that discharges the exhaust gas of a gas turbine, and has a cooling fan in which an outer cylinder is arranged outside the cylindrical main body and air is pushed between the main body and the outer cylinder. Since it is provided and air is circulated between the main body and the outer cylinder by the cooling fan, cooling is performed by sending air by the cooling fan, without using expensive materials such as insulation and heat resistant steel. A chimney having a structure that can withstand high temperatures can be constructed. As a result, it is possible to significantly reduce the cost.

The chimney of the present invention is a chimney that discharges the exhaust gas of a gas turbine, in which an outer cylinder is arranged outside a cylindrical main body, and a ring member is rotatably provided at the upper end of the main body. , The blade member arranged inside the main body is attached to the ring member, the fin arranged outside the main body is attached to the ring member, and the ring member is rotated by the exhaust gas through the blade member, so that the fin and the outside Since an air flow is generated between the cylinders, the ring member rotates via the blade member to generate an air flow for cooling, and an expensive material such as insulation or heat resistant steel is used. It is possible to configure a chimney having a structure that withstands high temperatures without requiring power for circulating the cooling air. As a result, it is possible to significantly reduce the cost.

Since the main body is made of steel and the outer cylinder is made of stainless steel or aluminum, the material cost of the chimney can be reduced.

The gas turbine equipment of the present invention comprises a gas turbine comprising a compressor and a turbine, an exhaust heat recovery boiler for generating steam by the exhaust gas of the gas turbine, and a steam turbine equipment operated by the steam of the exhaust heat recovery boiler. ,
The chimney according to any one of claims 1 to 3, which is provided in the exhaust gas passage from the gas turbine to the exhaust heat recovery boiler and discharges the exhaust gas of the gas turbine,
The turbine equipment can be provided with a chimney having a structure capable of withstanding high temperatures without using expensive materials. As a result,
It is possible to significantly reduce the cost.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a main part of a combined cycle power generation plant (gas turbine facility) including a chimney according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a main part of a combined cycle power generation plant (gas turbine equipment) including a chimney according to a second embodiment of the present invention.

FIG. 3 is a perspective view of the top of the chimney.

FIG. 4 is a view taken along the line IV-IV in FIG.

[Explanation of symbols]

1 compressor 2 Combustor 4 gas turbine 5 Exhaust gas passage 6 Exhaust heat recovery boiler 11,21 chimney 12,22 body 13,23 Outer cylinder 14,24 Cooling passage 15 Cooling fan 25 Ring member 26 blade members 27 fins 28 Bearing member

Claims (4)

[Claims] 1. A chimney that emits exhaust gas from a gas turbine, wherein an outer cylinder is arranged outside a cylindrical main body, and a cooling fan for pushing air is provided between the main body and the outer cylinder, and the main body is cooled by the cooling fan. A chimney characterized by allowing air to flow between the outer cylinder and the outer cylinder. 2. A chimney for discharging exhaust gas of a gas turbine, wherein an outer cylinder is arranged outside a cylindrical main body, a ring member is rotatably provided at an upper end portion of the main body, and the ring member is arranged inside the main body. Attached to the ring member, the fins arranged outside the main body are attached to the ring member, and the ring member is rotated by the exhaust air through the blade member so that the fins cause an air flow between the main body and the outer cylinder. A chimney characterized by causing. 3. The chimney according to claim 1 or 2, wherein the main body is made of steel and the outer cylinder is made of stainless steel or aluminum. 4. A gas turbine comprising a compressor and a turbine, an exhaust heat recovery boiler for generating steam by the exhaust gas of the gas turbine, a steam turbine facility operated by the steam of the exhaust heat recovery boiler, and an exhaust heat from the gas turbine. A gas turbine facility comprising the chimney according to any one of claims 1 to 3, which is provided in an exhaust gas passage to a recovery boiler and discharges exhaust gas of a gas turbine.