JP6506935B2 - Silencer comprising silencer and gas turbine comprising the same - Google Patents

Description

The present invention relates to a silencer and a gas turbine having the same comprises a silencer.

  In general, a gas turbine is provided with a compressor, a combustion chamber, and a turbine, and the air taken in from an intake duct is compressed by the compressor and then heated by the combustion chamber, and the flow is adjusted by the turbine at the rear. Drive a generator coupled to this turbine.

Conventionally, it is known to provide a noise reduction device for reducing intake noise in the intake duct of such a gas turbine (see Patent Document 1 below).
8 and 9 show an example of a conventional noise reduction device. The conventional silencer shown in FIGS. 8 and 9 has a configuration in which a plurality of sound absorbing panels 202 are disposed in parallel with the gas flow at predetermined intervals in the outer frame 201 (or in the exhaust gas supply duct of the gas turbine). . In each sound absorbing panel 202, the sound absorbing block 204 is inserted in a lattice-shaped support frame 203, and a large number of holes 205a are formed in heat resistant steel plates on both sides of the support frame 202 so as to sandwich the sound absorber block 204. The porous plate 205 provided is mounted, and a flow straightening plate 206 is provided along the edge on the suction side of each sound absorption panel 202 of the support frame 203.

Patent No. 3631998

  However, since the above-mentioned conventional silencer is a splitter structure, its rigidity is low, and depending on the flow velocity, noise due to vibration may be generated.

Such present invention since it is intended to provide a silencer and a gas turbine having the same comprises a silencer which enables to suppress the noise due to the vibration.

Silencer apparatus according to a first invention to solve the problems above SL is
A silencer installed in an intake duct of a gas turbine,
One cylindrical member formed of a perforated plate and formed in a polygonal shape,
Two lid members made of a perforated plate and covering openings at both axial ends of the cylindrical member;
A sound absorbing material stored in a space closed by the cylindrical member and the lid member;
Consists of
The cylindrical member has a cross shape in a cross sectional view formed of four convex portions, and
The lid member is in the shape of a cross, and
The hollow portion of the cylindrical member has a cross shape in cross section,
The convex portion includes a plurality of silencers each including two opposing first surfaces and a second surface connecting the first surfaces .
A plurality of the silencers are superimposed in a direction orthogonal to the axial direction, with the axial direction directed in the gas flow direction ,
The adjacent silencers may be in surface contact with each other on the second surfaces .

Moreover, a gas turbine according to a second invention for solving the above-mentioned problems is:
A noise suppressor according to the first aspect of the invention is provided.

According to the silencer and a gas turbine having the same comprises a silencer according to the present invention described above, it is possible to improve the rigidity of the silencer, thereby silencer itself to reduce the noise due to the vibration.

It is a schematic block diagram which shows the gas turbine which concerns on Example 1 of this invention. It is a perspective view showing an intake silencer concerning Example 1 of the present invention. It is a perspective view showing a silencer concerning Example 1 of the present invention. It is sectional drawing of FIG. It is a perspective view showing an intake silencer concerning Example 2 of the present invention. It is a perspective view showing a silencer concerning Example 2 of the present invention. It is sectional drawing of FIG. It is a perspective view showing an example of the conventional intake silencer. It is a perspective view showing an example of the conventional intake panel.

Hereinafter, details of the silencer and a gas turbine provided with the same comprising a silencer according to the present invention with reference to the drawings.
The present invention is not limited to the following embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

Silencer and for a gas turbine having the same will be described comprising a silencer according to the first embodiment of the present invention with reference to FIGS.

As shown in FIG. 1, in the present embodiment, the gas turbine 1 includes an air compressor 10 for compressing intake air, a combustor 20 for burning fuel and discharging exhaust gas, and exhaust gas discharged from the combustor 20 And a turbine 30 driven by the
An intake duct 40 is connected to the inlet of the air compressor 10, and an intake silencer (muffler) 100 for reducing intake noise is provided inside the intake duct 40.

  As shown in FIG. 2, the intake silencer 100 is configured by arranging a plurality of cylindrical silencers 102 in a rectangular outer frame 101. More specifically, with the axial direction of the silencer 102 directed in the gas flow direction, a plurality of (in FIG. 2, seven horizontal rows and four vertical rows) are overlapped in the direction orthogonal to the axial direction. ing.

  As shown in FIG. 3 and FIG. 4, the silencer 102 is the same octagonal prism outer cylinder 121 made of a porous plate in which a large number of holes 121a are drilled in a heat resistant steel plate (for example, SUS). It has heat resistance as well as a regular octagonal columnar inner cylinder 122 formed of a perforated plate in which a large number of holes 122a are drilled in a steel plate and having an outer diameter smaller than that of the outer cylinder 121 and inserted into the outer cylinder 121. An annular lid made of a perforated plate in which a large number of holes 123a are bored in a steel plate and disposed at both axial ends of the outer cylinder 121 and the inner cylinder 122 to close the space between the outer cylinder 121 and the inner cylinder 122 A lid member 123 and a sound absorbing material 124 housed in a closed space formed by the outer cylinder 121, the inner cylinder 122 and the lid 123 are provided.

Each of the outer cylinder 121 and the inner cylinder 122 is formed by bending one or a plurality of perforated plates with a sheet metal and fixing the same in a cylindrical shape by welding. Further, the outer cylinder 121 and the lid 123, and the inner cylinder 122 and the lid 123 are also fixed by welding. The welding process is to be performed at the non-opened part of the perforated plate.
Further, the sound absorbing material 124 is a ceramic plate or the like formed by sintering or pressing glass wool or ceramic particles.

  Hereinafter, a method of assembling the above-described intake silencer 100 will be described. The intake silencer 100 according to the present embodiment is not installed in the intake duct 40 in a state where the outer frame 101 and the silencer 102 are assembled in advance, but a plurality of pieces carried apart in the intake duct 40. The silencers 102 are vertically and horizontally disposed and fixed. Here, the outer frame 101 and the silencer 102 are fixed by welding. Adjacent silencers 102 are arranged so as to be in surface contact, and are connected by a U-shaped fixing block 103 as shown in FIG.

  The fixing block 103 is formed in accordance with the shape of the silencer 102, provided at least at the gas inlet and at the gas outlet of the silencer 102 to connect the adjacent silencers 102 with each other. In other words, adjacent silencers 102 are not continuously fixed in the gas flow direction, but are in a partially connected state. This is because it is not necessary to completely fix the silencer 102 in the gas flow direction because the flow velocity of the gas is low in the intake duct 40.

  In the gas turbine 1 configured as described above, air taken in from the air intake duct 40 is reduced in air intake noise through the air intake silencer 100 and is guided to the air compressor 10. The air introduced to the air compressor 10 is compressed by the air compressor 10 and becomes high temperature / high pressure air (hereinafter referred to as compressed air). Then, the turbine 30 is driven by the high temperature and high pressure combustion gas generated by supplying fuel to the compressed air in the combustor 20, and a generator (not shown) connected to the turbine is driven.

At this time, in the present embodiment, the rigidity of the porous plate constituting the silencer 102 shown in FIGS. 8 and 9 is the conventional one shown in FIG. 8 and FIG. 9 by forming the intake silencer 100 with a plurality of silencers 102 formed cylindrically. 10 times higher than the structure of. By thus improving the rigidity of the silencer 102, the vibration noise is reduced compared to the prior art even when the porous plate constituting the silencer 102 vibrates due to the flow velocity of air flowing into the intake duct 40. Is possible.
Further, according to the present embodiment, since the silencer 102 is not cylindrical but is a polygonal cylindrical tube, the adjacent silencers 102 can be brought into surface contact with each other when the plurality of silencers 102 are overlapped, so assembly is possible. Also has the advantage of being easier.

  In the present embodiment, an example is shown in which the shape of the silencer 102 is a cylinder having a regular octagonal prism shape, but the shape of the silencer 102 is not limited to a regular octagonal prism, but may be a polygonal prism. However, if the outer peripheral shape is a cylinder having an even number of prisms, it is easy to bring the adjacent silencers 102 into surface contact and easier to assemble than the cylinder having an odd number of prisms, which is preferable. In addition, for example, when the shape of the silencer is a cylinder of a hexagonal column, and it is necessary to abut and fix the refracted portions, for example, when the silencers are superimposed in a lattice shape in a direction orthogonal to the axial direction The outer peripheral surfaces may be fixed by L-shaped fixing blocks. In this case, the L-shaped fixing block may be formed in accordance with the shape of the silencer and a plurality of L-shaped fixing blocks may be attached in the gas flow direction.

  Further, the shape of the holes 121a, 122a, 123a of the porous plate is not limited to a circle, and may be a polygon, and the distribution of the holes 121a, 122a, 123a of the porous plate may be the same aperture ratio on all surfaces, or different aperture ratios. Good.

  In the present embodiment, the silencers 102 have the same shape, but they do not have to have the same shape, and different shapes can be used as long as adjacent silencers can be fixed by the fixing block. I don't care. However, the same shape has an advantage of simplifying the manufacturing process.

Further, although the example in which the silencers 102 are arranged at equal intervals in the vertical and horizontal directions is shown in the present embodiment, the arrangement of the silencers 102 does not have to be equal intervals, and the intervals may be different.
Further, although the example in which the silencer 102 is disposed in the outer frame 101 is shown in the present embodiment, it goes without saying that the silencer 102 may be disposed directly in the intake duct 40.

Hereinafter, silencer and for a gas turbine having the same will be described comprising a silencer according to a second embodiment of the present invention with reference to FIGS. 5-7. The present embodiment is different from the above-described first embodiment in the structure of the intake silencer 100. The other structure is the same as the structure shown in FIG. 1 and described above. In the following, members having the same functions as the members shown in FIG. 1 and described above are denoted by the same reference numerals, and overlapping descriptions are omitted. The explanation will focus on points.

  As shown in FIG. 5, in the present embodiment, the intake silencer 100 is configured by disposing a plurality of cylindrical silencers 104 in a rectangular outer frame 101. More specifically, with the axial direction of the silencer 104 directed in the gas flow direction, a plurality of the silencers 104 (five rows in the horizontal direction and three stages in the vertical direction in FIG. 2) are overlapped in the direction orthogonal to the axial direction. ing.

  As shown in FIGS. 6 and 7, the silencer 104 is a cross-sectionally cross-shaped cylindrical body 141 formed of a porous plate in which a large number of holes 141a are drilled in a heat-resistant steel plate (for example, SUS). In a closed space formed by a cover 142 covering the openings at both ends in the axial direction of the cylindrical body 141, and a closed space formed by the cylindrical body 141 and the cover 142. It consists of the sound absorbing material 143 accommodated. In other words, the hollow portion of the silencer 104 has a cross shape, and the sound absorbing material 143 is accommodated in the hollow portion and closed by the lid 142.

The cylindrical body 141 is formed by bending one or a plurality of perforated plates with a sheet metal and fixing the same in a cylindrical shape by welding. The cylindrical body 141 and the lid 142 are also fixed by welding. The welding process is to be performed at the non-opened part of the perforated plate.
The sound absorbing material 143 is, for example, a ceramic plate formed by sintering or pressing glass wool or ceramic particles.

Hereinafter, a method of assembling the above-described intake silencer 100 will be described. The intake silencer 100 according to the present embodiment is not installed in the intake duct 40 in a state where the outer frame 101 and the silencer 104 are assembled in advance, but a plurality of pieces carried apart in the intake duct 40. The silencer 104 is vertically and horizontally disposed in the outer frame 101 and fixed by installation.
The outer frame 101 and the silencer 104 are fixed by welding. Adjacent silencers 104 are arranged so as to be in surface contact, and are connected by a U-shaped fixing block 105 as shown in FIG.

  The fixing block 105 is formed in accordance with the shape of the silencer 104, provided at least at the gas inlet and at the gas outlet of the silencer 104 to connect adjacent silencers 104 with each other. In other words, the adjacent silencers 104 are not continuously fixed in the gas flow direction, but only partially connected. This is because it is not necessary to completely fix the silencer 104 in the gas flow direction because the flow velocity of the gas is low in the intake duct 40.

  Also in the intake silencer 100 according to the above-described embodiment, the rigidity of the porous plate constituting the silencer 104 is obtained by overlapping the plurality of cylindrical silencers 104 similarly to the above-described embodiment 1. It becomes possible to make it 10 times or more higher than the conventional structure shown in FIGS. 8 and 9 and described above. And, by improving the rigidity of the silencer 104, even if the porous plate vibrates due to the flow velocity of the air flowing into the intake duct 40, it is possible to significantly reduce the vibration noise compared to the conventional case. . Furthermore, since the silencer 104 is not cylindrical but has a cross-shaped cylinder, adjacent silencers 104 can be brought into surface contact when superposing a plurality of silencers 104, so that assembly becomes easy.

  The shape of the holes 141a and 142a of the porous plate is not limited to a circle, and may be a polygon, and the distribution of the holes 141a and 142a of the porous plate may be the same aperture ratio or different aperture ratios on all surfaces.

Further, although the example in which the silencers 104 are arranged at equal intervals in the vertical and horizontal directions is shown in the present embodiment, the arrangement of the silencers 104 does not have to be equal intervals, and the intervals may be different.
Further, although the example in which the silencer 104 is disposed in the outer frame 101 is shown in this embodiment, it goes without saying that the silencer 104 may be disposed directly in the intake duct 40.

  The present invention is suitably applied to a silencer, a silencer including the same, and a gas turbine including the silencer.

1 gas turbine 10 air compressor 20 combustor 30 turbine 40 intake duct 100 intake silencer (muffler)
DESCRIPTION OF SYMBOLS 101 Outer frame 102, 104 silencer 103, 105 Fixing block 121 Outer cylinder 121a, 122a, 123a, 141a, 142a hole 122 inner cylinder 123, 142 lid 124, 143 sound absorbing material 141 cylinder 143 sound absorbing material

Claims (2)

A silencer installed in an intake duct of a gas turbine,
One cylindrical member formed of a perforated plate and formed in a polygonal shape,
Two lid members made of a perforated plate and covering openings at both axial ends of the cylindrical member;
A sound absorbing material stored in a space closed by the cylindrical member and the lid member;
Consists of
The cylindrical member has a cross shape in a cross sectional view formed of four convex portions, and
The lid member is in the shape of a cross, and
The hollow portion of the cylindrical member has a cross shape in cross section,
The convex portion includes a plurality of silencers each including two opposing first surfaces and a second surface connecting the first surfaces .
A plurality of the silencers are superimposed in a direction orthogonal to the axial direction, with the axial direction directed in the gas flow direction ,
The silencer according to any one of the preceding claims, wherein the adjacent silencers make surface contact with each other on the second surfaces . A gas turbine comprising the silencer according to claim 1 .

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