JP6183905B2 - Duct and gas turbine provided with the same - Google Patents

Description

  The present invention relates to a duct such as an intake duct and an exhaust duct, and a gas turbine including the same.

  A gas turbine takes in outside air and generates compressed air, a plurality of combustors that generate high-temperature and high-pressure combustion gas by mixing fuel with compressed air and combustion, and combustion generated by each combustor And a turbine that is driven by converting energy of gas into rotational power.

  An intake duct is connected to the compressor, and air is supplied from the intake duct to the compressor. Further, the intake duct is provided with an intake filter and a silencer inside.

  An exhaust duct is connected to the turbine, and high temperature exhaust gas after driving the turbine is led to an exhaust heat recovery boiler or the like through the exhaust duct.

  Such an intake duct and an exhaust duct are provided with interposing members such as a heat insulating material and a sound absorbing material on the surface (inner surface or outer surface) of a duct main body having a cylindrical shape. This interposing member mounting structure and holding structure includes a plate-like pressing member disposed with a gap between the surface of the cylindrical duct body, one end side to the duct body, and the other end side to the pressing member. And a support pin that supports the presser member in a state where a gap is left between the surface of the duct body.

  And it is comprised so that the surface of a duct main body may be coat | covered by interposing interposed members, such as a heat insulating material and a sound absorption material, between a duct main body and a pressing member (for example, patent document 1). reference).

JP 58-13902 A

  However, in the intake duct and the exhaust duct as in Patent Document 1, a plate-like pressing member for holding an interposed member such as a heat insulating material or a sound absorbing material connects one end side to the duct body and the other end side. It installs so that the surface of a duct main body may be coat | covered using the attachment volt | bolt each connected to the pressing member. For this reason, as intake or exhaust air flows through the inside of the duct main body, vibration may propagate to the duct main body and the holding member through the mounting bolt, thereby causing resonance or the like.

  The duct of the present invention is formed in a cylindrical shape, and is interposed between the duct main body through which gas flows, the pressing member disposed away from the surface of the duct main body, and the duct main body and the pressing member. And a plurality of support members extending in the separating direction of the duct main body and the presser member and connecting the duct main body and the presser member, the support member being specified between the duct main body and the presser member therebetween. The area of the cross section perpendicular to the extending direction becomes gradually smaller toward the location.

  According to the above-described configuration, the generated vibration is concentrated on the specific portion of the support member, so that the vibration mode can be made uniform and higher-order components included in the vibration can be reduced.

  Moreover, in the duct of this invention, this specific location may be comprised as an intermediate position in the area | region ranging from the edge inside radial direction in the support member to the edge outside radial direction.

  According to the above-described configuration, both vibration modes are evenly uniform by concentrating the vibration propagating from the inside in the radial direction of the support member and the vibration propagating from the outside at a specific location provided at the intermediate position. And higher-order components of vibration can be reduced.

  Furthermore, the duct of the present invention may be configured to include a plurality of support members that are arranged apart from each other along the direction in which the gas flows.

  According to the above configuration, the vibration mode can be made uniform over the entire extending region of the duct by the plurality of support members, and higher-order components of vibration can be reduced.

  Moreover, in the duct of this invention, it is good also as a structure provided with the connection member to which the some support member was connected mutually adjacently.

  According to the configuration as described above, vibrations in the respective support members can be further reduced by dispersing each other by the connection members.

  Moreover, in the duct of this invention, a connection member is good also as a structure which connects the said specific location of the mutually adjacent support member.

  According to the configuration as described above, the vibration mode of vibration including low-order components concentrated at the specific location can be made uniform by the connecting member.

  Furthermore, in the duct of the present invention, the connecting member may be a damper that attenuates the applied external force.

  According to the configuration as described above, the vibration mode including the low-order component concentrated at the specific location can be made uniform by the damper and can be damped.

  A gas turbine according to the present invention includes any of the ducts described above as an intake duct and / or an exhaust duct.

  ADVANTAGE OF THE INVENTION According to this invention, a duct with little solid propagation sound and a gas turbine can be provided.

It is a figure showing an example of a gas turbine concerning a first embodiment of the present invention. It is a figure which shows sectional drawing in the XX line in FIG. 1 of the duct which concerns on 1st embodiment of this invention. It is a figure which shows the state before the vibration mode of the duct which concerns on 1st embodiment of this invention changes. It is a figure which shows the state before the vibration mode of the duct which concerns on 1st embodiment of this invention changes. It is a figure which shows sectional drawing of the duct which concerns on 2nd embodiment of this invention.

  Hereinafter, with reference to FIG.1 and FIG.2, the duct and gas turbine which concern on one Embodiment of this invention are demonstrated.

  As shown in FIG. 1, the gas turbine A according to the present embodiment includes a compressor 1 that compresses outside air to generate compressed air, and a fuel supplied from a fuel supply source is mixed with the compressed air and burned to burn the combustion gas. And a turbine 3 to which the high-temperature and high-pressure combustion gas generated by the combustor 2 is sent and driven.

  The turbine 3 includes a metal casing 4 and a turbine rotor 5 that rotates in the casing 4, and the turbine rotor 5 is connected to a generator (not shown) that generates power by rotating the turbine rotor 5, for example. . The turbine rotor 5 of the present embodiment is, for example, a multistage rotor blade type turbine rotor, and includes a rotor body 6 formed by stacking a plurality of rotor disks and a plurality of rotor blades 7 extending radially from each rotor disk. Furthermore, a plurality of stationary blades 8 extending from the inner peripheral surface of the casing 4 in a direction approaching the rotor main body 6 are provided on the upstream side of the moving blades 7 of each stage.

  On the other hand, the plurality of combustors 2 are disposed in a metal casing 4 of the turbine 3 and are disposed at equal intervals in the circumferential direction around the rotation axis O <b> 1 of the turbine rotor 5.

  In addition, an intake duct (duct) 10 is connected to the compressor 1, and air is supplied from the intake duct 10 to the compressor 1. Furthermore, the intake duct 10 of this embodiment is provided with an intake filter 11 and a silencer 12 inside.

  Further, an exhaust duct (duct) 13 is connected to the turbine 3, and the high-temperature exhaust gas after driving the turbine 3 (the turbine rotor 5) is led out to the exhaust heat recovery boiler through the exhaust duct 13. Yes.

  As shown in FIGS. 1 and 2, the intake duct 10 and the exhaust duct 13 cover the surface 15b (15a) on the surface (the inner surface 15a and / or the outer surface 15b) of the cylindrical duct body 15. Thus, an interposition member 16 such as a heat insulating material or a sound absorbing material is attached. Here, in the intake duct 10, the interposed member 16 is provided on the outer surface 15 b side of the duct body 15, and in the exhaust duct 13, the interposed member 16 is provided on the inner surface 15 a side of the duct body 15. Further, as the interposing member 16 such as a heat insulating material or a sound absorbing material, a well-known heat insulating material such as glass wool or urethane foam or a sound absorbing material is used.

  The interposition member 16 as described above is attached to the duct body 15 by a pressing member 17 and a support member 18. The pressing member 17 is a cylindrical member that is formed along the shape of the surface of the duct main body 15 while the surface thereof has a flat plate shape. The support member 18 is an annular member in external view, and the dimension in the direction of the rotation axis O1 is smaller than the other part at the specific part 18a located in the extending direction in the radial direction. More specifically, the cross-sectional area perpendicular to the extending direction of the support member 18 is gradually reduced from the duct body 15 and the pressing member 17 toward the specific portion 18a. In the present embodiment, the specific portion 18a is set at an intermediate position in a region extending from the radially outer edge 18b to the radially inner edge 18c of the support member 18.

  The holding member 17 is held at a position separated from the surface 15b (15a) of the duct body 15 by the support member 18 as described above. More specifically, the holding member 17 is fixed to the radially inner edge 18 c of the support member 18, and the radially outer edge 18 b of the support member 18 is fixed to the surface 15 b (15 a) of the duct body 15. Is done. At this time, a cylindrical space is formed between the pressing member 17 and the surface 15b (15a) of the duct body 15. The interposition member 16 is interposed between the pressing member 17 and the surface 15b (15a) of the duct body 15 so as to fill the space.

  The support member 18 is fixed to the duct body 15 so as not to drop off by fixing means (not shown) such as a bolt. Similarly, the pressing member 17 is fixed to the support member 18 by fixing means such as a bolt.

  When the turbine 3 configured as described above is put into an operating state, vibration occurs throughout the turbine 3 due to rotation of the compressor 1 and the turbine rotor 5, combustion in the combustor 2, and the like. This vibration eventually propagates to the duct body 15 and causes noise with intake and exhaust. In particular, the vibration generated by the pressing member 17 provided on the surface 15b (15a) of the duct body 15 reaches the duct body 15 through the support member 18 and causes so-called solid propagation sound.

  Here, if the support member 18 is formed so as to have a uniform dimension from the radially inner side to the radially outer side, the vibration is easily propagated, so that the intake sound and the intake sound are high-frequency components (high-order components). Vibration including a random vibration mode composed of a low-frequency component (low-order component) propagates to the duct body 15 (see FIG. 3A).

  However, as described above, in the present embodiment, the cross-sectional area is set to be smaller as it goes from the radial end edge of the support member 18 toward the specific portion 18a at the radial intermediate position. According to this, the vibration generated in the pressing member 17 is concentrated on the specific portion 18a, so that the vibration mode becomes uniform (see FIG. 3B) and the higher order components are reduced. Therefore, the solid propagation sound generated in the duct body 15 is reduced.

  In the present embodiment, the specific portion 18a is configured as an intermediate position in a region extending from the radially inner end edge to the radially outer end edge of the support member 18.

  According to such a configuration, both vibration modes are evenly distributed by concentrating the vibration propagating from the inner side in the radial direction of the support member 18 and the vibration propagating from the outer side on the specific portion 18a provided at the intermediate position. It can be made uniform, and higher-order components of vibration can be reduced.

  In the present embodiment, the plurality of support members 18 are arranged apart from each other along the direction in which the gas flows.

  According to this, the support members 18 are arranged in the direction in which the gas flows, that is, in the entire region in which the duct body 15 extends. Therefore, solid propagation sound can be reduced over the entire region where the duct body 15 extends.

  Moreover, in this embodiment, the connection member has connected each specific location in several support members. According to such a configuration, it is possible to make the vibration mode of vibration including low-order components concentrated at the specific location uniform by the connecting member. Therefore, solid propagation sound can be reduced more effectively.

  Furthermore, in the duct of the present invention, a damper that attenuates an external force is employed as the connecting member. According to such a configuration, the vibration mode including the low-order component concentrated at the specific location can be made uniform by the damper and can be damped. Therefore, solid propagation sound can be reduced more effectively.

  As mentioned above, although one embodiment of the duct concerning the present invention and a gas turbine provided with this was explained, the present invention is not limited to the above-mentioned embodiment, and can be changed suitably in the range which does not deviate from the meaning. .

  For example, in the present embodiment, the duct 10 (13) is illustrated and described as being the intake duct 10 (exhaust duct 13) provided in the gas turbine A, but the duct according to the present invention is a gas turbine. The exhaust duct 13 of A may be used, and it is of course applicable not only to the gas turbine A but also to ducts provided in all facilities.

Next, a second embodiment of the present invention will be described with reference to FIG. In addition, about the member similar to 1st embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 4, on the surface 15b (15a) of the duct main body 15 according to the present embodiment, a presser member 17, a support member 18, and an intervening therebetween, as in the first embodiment. A member 16 is provided. Further, the plurality of support members 18 adjacent to each other are connected to each other by a connection member 21. The connection member 21 includes a pair of connection bodies 19 and a damper 20 having both ends connected to the connection bodies 19. Further, the pair of connecting bodies 19 and 19 and the damper 20 are connected to each other in the same straight line. The pair of connecting members 19, 19 are rod-shaped members formed of metal or the like, and the axial direction thereof is directed to the same direction as the axial direction of the duct main body 15, so that the radial intermediate position of the support member 18 (specific location) 18a). The damper 20 is a well-known member provided between the pair of connecting members 19 and 19 and has a function of attenuating external force applied from the outside. As described above, the connecting member 21 connects the mutually opposing surfaces of the plurality of adjacent support members 18 in the circumferential direction of the duct body 15.

  According to the above configuration, the vibration propagated from the presser plate 17 to the support member 18 is attenuated by the damper 20 after being propagated to the pair of connecting members 19 and 19. As a result, vibrations that do not include higher-order components concentrated at the radial intermediate position (specific portion 18a) of the support member 18, that is, vibrations mainly composed of lower-order components are attenuated.

  Therefore, according to the present embodiment, vibration generated in the duct body 15 reduces not only high-order components but also low-order components. Thereby, the solid propagation sound resulting from a vibration is suppressed.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Combustor 3 Turbine 4 Casing 5 Turbine rotor 6 Rotor main body 7 Rotor blade 8 Stator blade 10 Intake duct (duct)
11 Intake filter 12 Silencer 13 Exhaust duct (duct)
15 Duct body 15a Inner surface (surface)
15b External surface (surface)
16 Intervening member 17 Holding member 18 Supporting member 19 Connecting member 20 Damper A Gas turbine O1 Rotating axis of turbine rotor

Claims (7)

A duct body that is formed in a cylindrical shape and in which a gas flows;
A holding member disposed away from the surface of the duct body;
An interposition member interposed between the duct body and the pressing member;
A plurality of support members extending in the separating direction of the duct body and the pressing member, and connecting the duct body and the pressing member;
With
The support member is a duct in which an area of a cross section perpendicular to the extending direction gradually decreases from the duct body and the pressing member toward a specific portion between them.   2. The duct according to claim 1, wherein the specific portion is an intermediate position in a region extending from a radially inner edge to a radially outer edge of the support member.   The duct according to claim 1, further comprising a plurality of the support members arranged apart from each other along a direction in which the gas flows.   The duct according to claim 3, further comprising a connection member in which the plurality of support members are connected adjacent to each other.   The duct according to claim 4, wherein the connection member connects the specific portions of the support members adjacent to each other.   The duct according to claim 4 or 5, wherein the connecting member is a damper that attenuates an applied external force.   A gas turbine comprising the duct according to any one of claims 1 to 6 as an intake duct and / or an exhaust duct.

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