KR20170007871A - Gas turbine comprising an exhaust hood provided with an air guide member - Google Patents

Gas turbine comprising an exhaust hood provided with an air guide member Download PDF

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Publication number
KR20170007871A
KR20170007871A KR1020150092190A KR20150092190A KR20170007871A KR 20170007871 A KR20170007871 A KR 20170007871A KR 1020150092190 A KR1020150092190 A KR 1020150092190A KR 20150092190 A KR20150092190 A KR 20150092190A KR 20170007871 A KR20170007871 A KR 20170007871A
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KR
South Korea
Prior art keywords
exhaust hood
gas turbine
donut
air induction
induction member
Prior art date
Application number
KR1020150092190A
Other languages
Korean (ko)
Inventor
권기범
Original Assignee
두산중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 두산중공업 주식회사 filed Critical 두산중공업 주식회사
Priority to KR1020150092190A priority Critical patent/KR20170007871A/en
Publication of KR20170007871A publication Critical patent/KR20170007871A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30—Exhaust heads, chambers, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
    • F02C9/16—Control of working fluid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/32—Application in turbines in gas turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Abstract

The present invention relates to a gas turbine including an exhaust hood provided with an air induction member. More particularly, the present invention relates to a gas turbine including an air induction member in an exhaust hood located at a rear end of a last stage blade among a plurality of turbine blades of a gas turbine A gas turbine including an exhaust hood provided with an air induction member for improving exhaust efficiency by reducing a flow loss caused by a speed of a strong swirl component generated at a rear stage of a last stage blade, The structure described above prevents the flow loss from occurring due to the swirl speed, and it is possible to induce the flow for discharging the exhaust gas more stably than the prior art. As a result, it is possible to efficiently discharge the combustion gas and the exhaust gas, thereby enhancing the overall efficiency of the generator and reducing the fluid load generated inside the generator.

Description

[0001] The present invention relates to a gas turbine including an exhaust hood provided with an air induction member,

The present invention relates to a gas turbine including an exhaust hood provided with an air induction member. More particularly, the present invention relates to a gas turbine including an air induction member in an exhaust hood located at a rear end of a last stage blade among a plurality of turbine blades of a gas turbine A gas turbine including an exhaust hood provided with an air induction member for improving exhaust efficiency by reducing a flow loss caused by a speed of a strong swirl component generated at a rear stage of a last stage blade, .

Turbine generators, commonly used in gas turbine power generation, operate on the principle of burning fuel through compressed air to generate powerful energy and using it to operate the turbine.

Here, the combustion gas that completes the combustion in the combustor and transfers the power to operate the plurality of turbine blades is finally exhausted to the outside of the generator via the exhaust hood.

The high-temperature and high-pressure combustion gas passes through the last stage blade and enters the exhaust hood. The combustion gas is advanced and discharged in a direction opposite to the structure of the exhaust hood and the advance direction of the combustion gas. There is a problem that a strong swirl occurs and a flow loss occurs due to the swirl speed.

Therefore, in providing the structure of the exhaust hood of the turbine generator, it is required to install additional air induction members and improve the shape thereof so that the flow loss does not occur due to the speed of swirl that occurs.

Korean Patent Publication No. 2014-0056024 (Published May 2014, 2014)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an exhaust hood which is located at the rear end of a last stage blade, And to provide a gas turbine including an additional air induction member.

According to an aspect of the present invention, there is provided a turbine blades, including a combustor, a plurality of turbine blades provided at an outlet of the combustor, and a turbine blade disposed at a downstream end of a last stage blade of the plurality of turbine blades A gas turbine including an exhaust hood and an air induction member provided inside the exhaust hood may be provided.

The air induction member may include a donut-shaped guide portion and a plurality of fin-shaped supports.

In addition, it is preferable that the donut-shaped guide portion is inclined at one side of the donut-shaped guide portion in the direction of the last-stage blade with a predetermined inclination.

Alternatively, the donut-shaped guiding portion may be formed such that the donut-shaped guiding portion in the direction of the stage blade has a curved cross-section.

In addition, it is preferable that the supporting portion is constituted by at least five or more, and the supporting portions are arranged in the circumferential direction at regular intervals on one surface of the guide portion.

The donut-shaped guide portion may be formed by welding an outer surface of the guide portion to the exhaust hood in a welding manner, and the support portion may be formed by welding one end of the support portion to the exhaust hood in a welding manner, It is possible.

The gas turbine including the exhaust hood provided with the air induction member of the present invention as described above prevents the flow loss from occurring due to the swirl speed generated through the air induction member additionally provided in the exhaust hood, It is possible to induce a more stable discharge flow of exhaust gas.

In conclusion, this can lead to efficient discharge of combustion gases and exhaust gases, which can increase the overall efficiency of the turbine generator and result in a reduction of the fluid load inside the turbine generator.

1 is a side sectional view of a gas turbine rear end portion including an exhaust hood provided with an air induction member showing an embodiment of the present invention.
2 is a side cross-sectional view of a gas turbine rear end portion including an exhaust hood provided with an air induction member showing an embodiment of the present invention.
3 is a side cross-sectional view of a gas turbine rear end portion including an exhaust hood provided with an air induction member showing an embodiment of the present invention.
4 is a front view of an air induction member and a plurality of supporters showing one embodiment of the present invention.
5 is a side sectional view showing a plurality of air induction members and a plurality of embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected,""coupled," or "connected. &Quot;

A plurality of turbine blades 20 provided at an outlet of the combustor 10 and an exhaust hood 30 located at a downstream end of a last stage blade 21 of the plurality of turbine blades 20, And an air induction member 40 provided inside the exhaust hood 30 may be provided.

Fig. 1 shows a gas turbine 1 including an exhaust hood 30 provided with the air induction member 40. Fig.

The combustors 10 are generally arranged in a circumferential direction at regular intervals in the gas turbine 1, and a combustion gas outlet (not shown) is provided at the rear end of the combustor 10 to discharge a combustion gas or an exhaust gas do.

The high-temperature, high-pressure combustion gas discharged from the combustion gas outlet (not shown) is drawn toward a plurality of turbine blades 20 connected to the combustion gas outlet.

A plurality of turbine blades 20 having an airfoil shape in section are rotated by the high-temperature, high-pressure combustion gas and rotate the rotor (not shown) to produce electric power.

In this case, since the combustion gas passing through the plurality of turbine blades 20 has fulfilled its role, the exhaust gas is discharged through the combustor cover from the last stage turbine blade 21 to the inlet of the combustor 10 .

Therefore, an apparatus for rotating the direction of the high-pressure combustion gas and forming a stable flow must be provided in the exhaust hood 30. [

According to the present invention, the air induction member 41 is provided inside the exhaust hood 30 so that the traveling direction of the combustion gas introduced into the exhaust hood 30 at high pressure is naturally transmitted to the plurality of turbine blades 20 and the combustor 10) outer space.

Therefore, by providing the air induction member 40 inside the exhaust hood, the flow loss is prevented from occurring due to the swirl speed generated, and compared with the conventional art, Flow induction is possible. In conclusion, this can contribute to efficient discharge of combustion gas and exhaust gas, which can enhance the overall efficiency of the generator and result in a reduction of the fluid load occurring inside the generator.

The air induction member 40 may be provided with a donut-shaped induction portion 41 and a plurality of fin-shaped support portions 42.

The above-described air induction member 40 may have a specific shape to enable formation of a more efficient flow.

1, the air induction member 40 may include an induction unit 41 and a support unit 42. The induction unit 41 typically has a donut shape and supports the support unit 42, Can have a function of stably supporting the donut-shaped guide portion 41 with the shape of a pin.

In this case, the donut-shaped induction portion 41 may be provided with a donut-shaped induction portion 41 inclined at a predetermined angle with respect to the direction of the last stage blade 21 have.

In order to allow the combustion gas to be discharged on the outer surfaces of the combustor 10 and the turbine blade 20 more efficiently than the shape of the guide portion 41 provided in a straight line shape, A donut shape in the form of a donut, and a shape in which a cross section does not form a straight line having the same axis.

2, the air guide member 40 and the guide (not shown) inside the exhaust hood 30 are arranged in a donut shape having a slope of an angle a.

This configuration is advantageous in that the combustion gas can be discharged on the outer surface of the combustor 10 and the turbine blade 20 more efficiently than the shape of the guide portion 41 provided in a straight line shape having the same axis in cross section, (1) there is an effect of reducing the overall flow load.

The donut-shaped guiding portion 41 may be provided with a gas turbine 1 having a donut-shaped guiding portion 41 curved in a curved shape in the direction of the last stage blade 21 .

It is possible to construct the guide portion 41 having a shape in which the above-mentioned cross section does not form a straight line having the same axis but it is constituted by inclining the end portion of the donut-shaped guide portion 41 in the direction of the last stage blade 21, There is an effect of reducing the flow load of the entire gas turbine 1 in that the combustion gas can be discharged on the outer surfaces of the combustor 10 and the turbine blade 20 efficiently along the curved section of the curved section do.

Referring to FIG. 3, it can be seen that the donut-shaped guiding portion 41 has a curved cross-section of the donut-shaped guiding portion 41 in the direction of the last-stage blade 21.

In the guide portion 41 and the support portion 42 described above, the support portions 42 are formed of at least five or more, and are arranged in a circumferential direction at regular intervals on one surface of the guide portion 41 The gas turbine 1 can be constructed.

In this case, it is preferable that the plurality of support portions 42 are formed in five or more in consideration of the structure and other stability of the exhaust hood 30 provided at the rear end of the gas turbine 1, It is preferable that the respective support portions 42 are arranged in the circumferential direction at regular intervals on one surface of the guide portion 41. [

4 and 5, a plurality of support portions 42 arranged in a circumferential direction at regular intervals on one surface of the donut-shaped guide portion 41 can be identified.

The donut-shaped guide portion 41 is connected to the guide portion 41 at one end thereof in a welding manner and at the other end thereof is connected to one surface of the guide portion 41 in a bolt- 41 are coupled to the exhaust hood 30 in a welded manner.

The first support portion 42 is coupled to the exhaust hood 30 in a welded manner and the other end of the support portion is fixed to one face of the guide portion 41 while adjusting the engagement position of the guide portion So that the support portion and the guide portion can be welded together first and then combined with the exhaust hood to overcome tangents and errors.

The donut-shaped guiding portion 41 is connected to the guiding portion 41 at one end thereof in a welding manner, and the other end thereof is coupled to one surface of the guiding portion 41 in a bolt- Is welded to the exhaust hood 30, so that it is possible to assemble and fasten the structure more stably and quickly than in the case where it is joined by other methods.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: Gas Turbine
10: Combustor
20: a plurality of turbine blades
21: Last stage blade
30: Exhaust hood
40: air induction member
41:
42: Support

Claims (6)

A combustor (10);
A plurality of turbine blades 20 provided at an outlet of the combustor 10;
An exhaust hood 30 located at a rear end of a last stage blade 21 of the plurality of turbine blades 20; And
An air induction member 40 provided inside the exhaust hood 30;
(1). The method according to claim 1,
The air induction member 40 includes a donut-shaped induction portion 41; And
A plurality of fin-shaped supports 42;
(1). ≪ / RTI > 3. The method of claim 2,
Wherein the donut-shaped induction part (41) is inclined at one side of the donut-shaped induction part (41) in a direction of the last stage blade (21) with a predetermined inclination. 3. The method of claim 2,
Wherein the donut-shaped guiding portion (41) is curved in an end-face of the donut-shaped guiding portion (41) in the direction of the last-stage blade (21). 5. The method according to any one of claims 2 to 4,
The gas turbine (1) according to claim 1 or 2, wherein the supporting portion (42) comprises at least five or more supporting portions (42), and the supporting portions (42) are arranged in a circumferential direction at regular intervals on one surface of the guide portion (41). 6. The method of claim 5,
One end of the support portion 42 is welded to the exhaust hood 30 and the other end of the support portion 42 is coupled to one surface of the guide portion 41 in a bolt manner. And the outer surface is welded to the exhaust hood (30).
KR1020150092190A 2015-06-29 2015-06-29 Gas turbine comprising an exhaust hood provided with an air guide member KR20170007871A (en)

Priority Applications (1)

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KR1020150092190A KR20170007871A (en) 2015-06-29 2015-06-29 Gas turbine comprising an exhaust hood provided with an air guide member

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150092190A KR20170007871A (en) 2015-06-29 2015-06-29 Gas turbine comprising an exhaust hood provided with an air guide member

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140056024A (en) 2012-10-29 2014-05-09 제너럴 일렉트릭 캄파니 Turbine exhaust hood and related method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140056024A (en) 2012-10-29 2014-05-09 제너럴 일렉트릭 캄파니 Turbine exhaust hood and related method

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