JP2003184573A - Gas turbine system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized gas turbine which is made compact, has excellent energy efficiency, and improves the environments around the gas turbine. <P>SOLUTION: Annular diffusers 4 are disposed on an output side outer periphery of a compressor 1. One ends of a number of fishtail members 5 are connected to outer peripheries of the diffusers 4 so that the members radially extend to cover the gas turbine 3. The other ends of the fishtail members are connected to a tubular recuperator 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine system including a combination of a small gas turbine and a recuperator.

[0002]

2. Description of the Related Art Conventionally, in a small-sized gas turbine having an output of 500 kW or less, a recuperator (regeneration heat exchanger) used in a large-sized gas turbine has been omitted because of a demand for downsizing and cost reduction. However, in micro gas turbine power generation, there are many examples of using a recuperator for improving efficiency. In this case, heat radiation from the recuperator itself is prevented by surrounding it with a heat insulating material. Similarly, heat radiation from the gas turbine was also prevented by surrounding it with a heat insulating material.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a small-sized gas turbine which is low in cost, compact in size, has high thermal efficiency, and has a good environment around the gas turbine.

[0004]

The gas turbine system of the present invention comprises a charge air (10) from a compressor (1).
However, in the gas turbine system in which the gas turbine (3) is supplied through the recuperator (2), the recuperator (2) is arranged coaxially with the dregs turbine (3), and the whole is formed into a tubular shape, An annular diffuser (4) is arranged on the outer circumference of the output part of the compressor (1), and one end of a large number of fish tails (5) each of which is made of a pipe are connected to each other on the outer circumference of the diffuser (4). ,
They extend radially so as to cover the gas turbine (3), and the other end is connected to the recuperator (2) (claim 1).

In the above structure, the respective fishtails (5) are extended to the outside so that the outer circumference of the recuperator (2) is covered, and the respective fishtails (5) are extended.
The other end of (5) can be communicated with the axial end of the recuperator (2) (claim 2).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory sectional view of a gas turbine system of the present invention, FIG. 2 is a partially cutaway schematic view of a recuperator 2 used in the system, and FIG.
3 is a schematic sectional view taken along the line III-III of FIG. 4 is a left side view of FIG. 1, and FIG. 5 is a plan view of the same. In this gas turbine system, as shown in FIG. 1, the compressor 1 and the gas turbine 3 are integrally formed by a casing, and the rotary shaft 6 of the gas turbine 3 and that of the compressor 1 are integrated. A rotary blade 24 and a rotary blade 7 are attached to the outer circumference of the rotary shaft 6, respectively. Further, the gas turbine 3 is provided with fixed blades 8 on the inner surface of its casing.

A diffuser 4 is provided on the outlet side of the charge air 10 of the compressor 1. The diffuser 4 converts the kinetic energy of the fluid into pressure energy, and is formed in an annular shape on the outer periphery of the compressor 1.
Fixed guide vanes or a large number of holes are formed radially. One end of the fishtail 5 is connected to each of the multiple openings of the diffuser 4, and the fishtail 5 extends radially so as to cover the gas turbine 3 and extends in the axial direction as shown in FIGS. The outer end of the recuperator 2 is covered and the other end communicates with the end of the recuperator 2.

The recuperator 2 is formed in a tubular shape as a whole, and as shown in FIGS. 2 and 3, a charge air passage 17 is formed on one side between a number of stacked metal plates, and an exhaust gas flow is formed on the other side. A path 18 is formed. Then, the exhaust gas 9 flows through the exhaust gas flow path 18, and the charge air 10 flows through the charge air flow path 17. The charge air 10 heated by the exhaust gas 9 is guided to the combustor 11 in FIG. 1, and the combustion gas thereof is guided to the gas turbine 3 to drive it.

In FIG. 3, each plate of the recuperator 2 is formed in an annular shape, and an intermediate portion in the axial direction of the recuperator 2 has a corrugated portion which is bent obliquely with respect to the axis line. The corrugations are made to intersect and a gas flow path is formed between them. The recuperator 2 is not limited to this example, of course. The fishtail 5 is formed in a pipe shape and guides the charge air 10 from the diffuser 4 to the recuperator 2. And many fishtails 5
The outer circumference of the gas turbine 3 and the recuperator 2
The outer periphery of is covered.

Although gaps are formed between the fishtails 5 in the examples of FIGS. 4 and 5, in order to fill the gaps and improve the heat insulating effect, as shown in FIG. It is also possible for the edges of the cross-section of 5 to be displaced in the radial direction so as to overlap one another. In the example of FIG. 8, the fishtails 5 are displaced in the radial direction so that they do not interfere with each other even if they are thermally expanded. Next, the exhaust gas 9 is the exhaust gas passage in the recuperator 2.
It flows through 18 and is guided from the exhaust gas tank 13 to an exhaust heat recovery device or the like.

Next, FIGS. 6 and 7 show a second embodiment of the present invention. This example is different from the first embodiment in that a plurality of recuperators 2 are arranged in an annular shape, The other end of the fishtail 5 is connected to the recuperator 2. In this example, the fishtail 5 does not cover the outer circumference of the recuperator 2 but covers only the outer circumference of the gas turbine 3. 6 and 7, each of the recuperators 2 has a rectangular cross section, and a triangular gap is formed between the adjacent recuperators 2. In order to reduce this triangular gap, the tank portion and the core portion of the recuperator 2 may be formed in an inverted trapezoidal cross section. Thereby, most of the triangular gaps can be filled, and the heat insulating effect is improved.

[0012]

In the gas turbine system of the present invention, one end of a large number of fish tails 5 each made of a pipe is connected to the outer periphery of the annular diffuser 4 and is radially extended so as to cover the gas turbine 3. Since the other end is connected to the recuperator 2, the fishtail 5 covers the gas turbine 3 and the fishtail 5
Reflects or absorbs radiant heat from the fishtail 5
The internal charge air 10 can be heated to improve the thermal efficiency, and the external environment around the gas turbine 3 can be favorably maintained.

Further, in the above structure, in the case where the fishtail 5 extends to the outside of the recuperator 2 so as to cover the outer periphery thereof, the fishtail 5 reflects or absorbs the radiant heat from the recuperator 2, and The thermal efficiency can be improved and the surrounding environment can be better maintained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of a gas turbine system of the present invention.

FIG. 2 is a partially cutaway explanatory view of a recuperator 2 used in the system.

3 is a schematic sectional view taken along the line III-III of FIG.

FIG. 4 is a left side view of FIG.

5 is a plan view of FIG.

FIG. 6 is a left side view of a gas turbine system showing a second embodiment of the present invention, which corresponds to the example of FIG. 4.

FIG. 7 is an explanatory diagram of a gas turbine system showing the second embodiment.

FIG. 8 is an explanatory cross-sectional view showing another embodiment of the fishtail of the gas turbine system of the present invention.

[Explanation of symbols]

1 compressor 2 Recuperator 3 gas turbine 4 diffuser 5 fishtail 6 rotation axes 7 rotors 8 fixed wing 9 exhaust gas 10 Charge air 11 Combustor 12 Charge air tank 13 Exhaust gas tank 15 Charge air inlet 16 Charge air outlet 17 Charge air flow path 18 Exhaust gas flow path 19 manifold 20 holes 21 outer cylinder 22 Inner cylinder 23 Side lid 24 rotors

Claims (2)

[Claims] 1. Charge air (1) from a compressor (1)
(0) is supplied to the gas turbine (3) via the recuperator (2), the recuperator (2) is arranged coaxially with the gas turbine (3), and is formed into a tubular shape as a whole. A circular diffuser around the output of the compressor (1)
A large number of fish tails, each of which is a pipe, is located on the outer circumference of the diffuser (4) and is spaced from each other.
(5) One end is connected and they are connected to the gas turbine.
A gas turbine system that extends radially to cover (3) and has its other end connected to the recuperator (2). 2. The recuperator according to claim 1, wherein each said fishtail (5) is said recuperator.
(2) A gas turbine system that extends to cover the outer periphery of (2) and has the other end of each fishtail (5) communicated with the axial end of the recuperator (2).