JP2003041947A - Gas turbine exhaust silencer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem wherein when exhaust gas passes in a clearance between silencer panels, since the exhaust gas is a turbulent flow, the pressure of the exhaust gas acts on the silencer panels 4d from left to right and from right to left alternately to cause a sound absorbing material 24 to strike on perforated plates 22 on every vibration to the right and left and then fibers of the sound absorbing material to be forced out gradually from holes of the perforated plates 22. SOLUTION: A gas turbine exhaust silencer reduces noise by passing exhaust gas emitted from a gas turbine through a splitter type exhaust silencer with a plurality of juxtaposed silencer panels in a flow direction. The silencer panels 4d are supported in sandwiched form by an upper support part 5 disposed in a given position on a duct ceiling surface of the exhaust silencer. An upper support part 6 on an exhaust silencer duct lower surface is mounted with guide rails 11 having an access opening 11d for the silencer panel and supporting the silencer panel in a longitudinally slidable position. The guide rails 11 are provided with detachable stoppers 14 and 15 for fixing the silencer panel, in given upstream and downstream setting positions along the exhaust gas flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a splitter type exhaust silencer used for reducing noise of a gas turbine exhaust gas.

[0002]

2. Description of the Related Art In recent years, gas turbines have become large in size along with the spotlight of combined cycle power plants, and the amount of exhaust gas has increased accordingly. FIG. 7 is a schematic diagram of an exhaust system of a combined cycle power plant. The high-temperature high-pressure gas introduced into the gas turbine 1 from a combustor (not shown) is exhausted to the exhaust duct 2 after driving the gas turbine 1 and exhaust gas EG. Is introduced into the exhaust heat recovery boiler (HRSG) 3, the thermal energy is recovered in the exhaust heat recovery boiler 3 to lower the temperature, and the heat energy is discharged from the stack (not shown) into the atmosphere.

By the way, since the noise at the gas turbine outlet increases as the capacity of the gas turbine increases, an exhaust silencer 4 is usually installed in the exhaust gas passage between the exhaust duct 2 and the exhaust heat recovery boiler 3. I am trying to reduce it. FIG. 8 is a front view (II-II cross-sectional view of FIG. 7) of the exhaust silencer 4 viewed from the upstream side of the exhaust gas, and FIG. 9 is a cross-sectional view of the exhaust silencer 4 viewed from above (III-III cross-sectional view of FIG. 8). Is. That is, the exhaust silencer 4 has a plurality of silencer panels 4d arranged in parallel in the direction in which the exhaust gas EG flows downward, and the gaps between the silencer panels 4d (about 100 mm).
The exhaust gas EG is made to flow into the. Here, although not shown, the silencer panel 4d is configured such that the sound absorbing material, which is wrapped in two layers with a cloth and a wire net and is subjected to a scattering prevention process, is sandwiched by side plates made of a perforated plate from both sides.

The ceiling surface 4 of the duct 4b of the exhaust silencer 4.
An upper support portion 5 is provided on the bU, and a lower support portion 6 is provided on the bottom surface 4bL of the duct 4b by welding or the like for each silencer panel 4d. Each silencer panel 4d is provided so as to be fitted between the upper support portion 5 and the lower support portion 6 and its position is determined. A plurality of spacers 4c are attached to the silencer panel 4d so that a gap between the silencer panels 4d is maintained.

[0005]

In such an exhaust silencer 4, since the exhaust gas EG flowing from the gas turbine is a turbulent flow, when the exhaust gas EG passes through the gap between the silencer panels 4d, Part of exhaust gas E
G can flow from one side surface of the silencer panel 4d, pass through the sound absorbing material in the silencer panel 4d, and can be blown out to the other side surface. Therefore, the turbulence of the exhaust gas EG causes the exhaust gas EG to move to the left and right of the silencer panel 4d.
Pressure acts on the silencer panel 4d alternately from left to right and from right to left. For this reason, the sound absorbing material inside the silencer panel 4d vibrates and collides with the side plate of the silencer panel 4d, and even if the sound absorbing material of the silencer panel 4d is subjected to the scattering prevention treatment, the sound absorbing material fibers are gradually blown into the holes of the perforated plate. Jumps out of.

When the fibers of the sound absorbing material are scattered in this way, not only the sound absorbing material inside the silencer panel 4d is reduced and the sound absorbing performance is deteriorated, but also the sound absorbing material scattered inside the heat transfer tube inside the exhaust heat recovery boiler 3 is absorbed. Since the material adheres, the heat transfer efficiency in the exhaust heat recovery boiler 3 decreases, and the operating efficiency of the gas turbine 1 decreases due to an increase in pressure loss.
There is a possibility that the power generation efficiency of the combined cycle power plant will be adversely affected.

Further, when the maintenance of the silencer panel 4d is performed due to such scattering of the sound absorbing material, the silencer panel 4d is removed because the gap between the silencer panels 4d is only about 100 mm as described above. You need to do some work. In such a case, in the conventional exhaust silencer 4, the silencer panel 4
After cutting the welded portions of the upper support portion 5 and the lower support portion 6 fixing d, the silencer panels 4d are taken out one by one onto a temporary guide rail newly installed on the upstream side of the exhaust gas EG, The silencer panel 4d and the sound absorbing material therein were maintained on the temporary guide rail. However, cutting the welded portions of the upper support portion 5 and the lower support portion 6 that fix the silencer panel 4d during maintenance in this way has extremely poor maintenance workability.

The present invention has been made in view of these circumstances, and provides a gas turbine exhaust silencer capable of reducing the scattering amount of the sound absorbing material, reducing the cost of the silencer panel, and improving the workability of maintenance. That is the purpose.

[0009]

In order to achieve the object of the above invention, the invention according to claim 1 guides exhaust gas discharged from a gas turbine into a duct, and the exhaust gas flows downward in the duct. In a gas turbine exhaust silencer designed to pass between a plurality of parallel silencer panels to reduce noise, each of the silencer panels,
A guide member provided at a predetermined position on the upper surface of the duct for guiding and supporting the silencer panel from both sides thereof, and provided on the lower surface of the duct, having an inlet / outlet port for the silencer panel and supporting the silencer panel slidably in the longitudinal direction. And a removable stopper provided on the guide rail for fixing the silencer panel at predetermined installation positions upstream and downstream in the exhaust gas flow direction.

The invention according to claim 2 is configured such that a temporary rail is provided so as to be freely attached to the inlet / outlet port of the silencer panel of the guide rail. In the invention according to claim 3, the detachable stopper is fixed together with the guide rail by a penetrating rod which can be inserted and removed laterally in a state of being housed in the groove of the guide rail, and The structure is provided with a fall prevention piece at both ends. According to these inventions, since the silencer panel can be easily taken in and out, the workability of maintenance can be improved.

Further, according to the invention of claim 4, the exhaust gas discharged from the gas turbine is guided into a duct, and the exhaust gas in the duct is passed between silencer panels juxtaposed in the flow-down direction to cause noise. In the gas turbine exhaust silencer designed to be reduced, in each of the silencer panels, one side plate that is in contact with the exhaust gas flow passage is a closing plate and the other side face is a porous plate.

Further, in the invention as set forth in claim 5, the exhaust gas discharged from the gas turbine is guided into the duct, and the exhaust gas in the duct is passed between a plurality of silencer panels juxtaposed in the flow-down direction to cause noise. In the gas turbine exhaust silencer aiming at reduction, each of the silencer panels is provided with a partition plate for partitioning the inside of the silencer panel in a direction intersecting with a flow-down direction of exhaust gas, while forming both side plates thereof with perforated plates. It was

Further, in the invention according to claim 6, the exhaust gas discharged from the gas turbine is introduced into the duct, and the exhaust gas in the duct is passed between silencer panels juxtaposed in the flow-down direction. In a gas turbine exhaust silencer designed to reduce noise, the silencer panel has its interior partitioned in the longitudinal direction and the vertical direction, and a silencer panel in which a sound absorbing material is not enclosed is arranged at a specific position in a part of the partition.

According to these inventions, not only the scattering phenomenon of the sound absorbing material can be suppressed and the deterioration of the sound absorbing performance can be suppressed, but also the sound absorbing material 6 adheres to the heat transfer pipe inside the exhaust heat recovery boiler 3. It is possible to suppress a decrease in operating efficiency of the gas turbine 1 due to a decrease in heat transfer efficiency and an increase in pressure loss.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The gas turbine exhaust silencer according to the present invention also has an exhaust duct 2 for a gas turbine as shown in FIG.
Between the heat recovery steam generator 3 and the exhaust heat recovery boiler 3, and a plurality of silencer panels 4d as shown in FIG. 9 are arranged inside the exhaust heat recovery boiler 3 along the flow of exhaust gas so that the intervals between the silencer panels 4d are constant. It will be.

(First Embodiment) FIGS. 1, 2, and 3 show a gas turbine exhaust silencer according to a first embodiment of the present invention when each silencer panel is arranged in a duct. 1A and 1B show a mounting structure of the upper and lower parts of the above, and FIG.
2B is a plan view of the upstream upper side, FIG. 2 is a mounting perspective view of the lower side, and FIG. 3A is a plan view of the lower side showing a relative positional relationship between the lower panel support and the positioning piece, And FIG.3 (b) is a figure which shows a guide rail among the top views of a lower part. 1, FIG. 2, and FIG. 3, common reference numerals are given to common configurations, and the same configurations as those in FIGS. 7 to 9 are given the same reference numerals, and detailed description thereof is omitted. .

In FIG. 1, reference numerals 51 and 52 denote upper support portions provided on the ceiling surface of an exhaust silencer duct (not shown) upstream and downstream of the exhaust gas EG flow. These upper support parts 51, 52 are two sets of upper panel support bases 71a, 71b and 72 fixed by welding or the like along the flow direction of the exhaust gas EG.
a, 72b and these two sets of upper panel support bases 71a, 7a
Upper guide members 81a, 81b, 82a, and 82b welded to the lower surfaces of 1b, 72a, and 72b, respectively.
It consists of and.

The opposing guide members 81a, 81a,
81b and 82a, 82b respectively sandwich the bull nose 4d1 and the current plate 4d2 near the silencer panel 4d from the side surface. Each guide member 81a,
81b, 82a and 82b are composed of two support plates and a reinforcing plate provided between these support plates and contacting each support plate at a substantially right angle, and support the silencer panels 4d arranged on both sides. Supported by a plate
It is possible to guide you. That is, the guide members 81a, 81b, 82a, and 82b
Installs a plurality of silencer panels 4d at equal intervals in the direction perpendicular to the exhaust gas flow EG with respect to the flow direction of the exhaust gas EG, and plays a role of preventing overturning when the silencer panel is extracted during maintenance. The guide member 8
A gap is secured between 1a and 81b and between 82a and 82b in consideration of heat expansion of the silencer panel 4d.

2 and 3 (a) and 3 (b),
91a, 91b, 92a, 92b, 93a, and 93
Reference numeral b denotes a pair of lower panel supports which are fixed to the bottom surface of an exhaust silencer duct (not shown) by welding at the upstream portion, the downstream portion, and the central portion in the flow direction of the exhaust gas EG.

Then, each pair of lower panel support bases 91
a, 91b, 92a, 92b, and 93a, 93b, lower panel support bases 91a, 91b, and 92a, 9 excluding intermediate lower panel support bases 93a, 93b.
Positioning piece 101 for guide rail 11 which will be described later in 2b
a, 101b, and 102a, 102b are fixed by welding.

Then, the positioning pieces 101a, 101
The guide rail 11 having a channel-shaped (concave) cross section shown in FIG. 3B is housed from above between b and between 102a and 102b. The guide rail 11 is the panel support base 9
1a, 91b, 93a, 93b, 92a, 92b is simply placed without welding. Since the position in the longitudinal direction is not fixed in this state, both sides of the guide rail 11 are provided on the upstream side and the downstream side, respectively. A total of four protrusions 12a, 12b and 13a, 13b, one pair each, are fixed by welding or the like, and the protrusions 12a, 12b and 13a, 13 are fixed.
b is sandwiched between the upstream positioning piece 101a and the downstream positioning piece 102a and between 101b and 102b. It should be noted that a structure is provided between these positioning pieces and the protrusions so as to secure a gap in consideration of expansion of the guide rail 11.

The guide rail 11 has silencer panels 4d on the upstream side and the downstream side of the exhaust gas EG, respectively.
The upstream stopper 14 and the downstream stopper 15 for sandwiching and fixing the exhaust gas at a predetermined position are attached to the side surface of the guide rail 11 itself from the upstream side to the downstream side of the exhaust gas 11a. , Groove 11b
And a hole 11c are provided. And the upstream stopper 1
The reference numeral 4 is formed in such a size that it fits into the channel of the guide rail 11, and has a hole 14a at a position facing the hole 11a of the guide rail 11.

The upstream stopper 14 is fixed to the guide rail 11 by inserting a round penetrating rod 16 into the hole 11a of the guide rail and the hole 14a of the upstream stopper 14. Reference numeral 17 is a split pin that functions as a piece for preventing the penetrating rod 16 from falling out, which is inserted into holes formed at both ends of the penetrating rod 16.

On the other hand, the size of the downstream stopper 15 is also formed so as to fit in the channel of the guide rail 1, and holes 15a and 15b are formed at positions facing the groove 11b and the hole 11c, respectively. The downstream stopper 15 is fixed to the guide rail 11 by passing the round penetrating rod 18 through these grooves and holes. Numeral 19 is a split pin that functions as a fall-out preventing piece.

Further, a case where the silencer panel 4d is installed in the exhaust silencer configured as described above will be described with reference to FIGS. When installing the silencer panel 4d in the exhaust silencer duct, the silencer panel 4d should be installed with the downstream stopper 15 attached to the guide rail 11.
d is inserted into the channel from the panel inlet / outlet port 11d on the upstream side of the channel of the guide rail 11, and is moved using a hydraulic jack (not shown) or the like until the lower edge of the silencer panel 4d on the side of the straightening plate 4d hits the downstream stopper 15. After that, the upstream stopper 14 is attached.

As a result, the silencer panel 4d is guided upward in the longitudinal direction between the guides 81a and 81b and between the guides 81a and 81b, and in the state where the lower part is fitted in the channel and the movement in the width direction is suppressed. The positioning in the longitudinal direction is completed by 14 and the downstream stopper 15, and the final fixed state is achieved.

By the way, when pulling out the silencer panel 4d at the time of maintenance, first, the guide rail 1 is used.
The temporary rail 20 is firmly fixed to the panel inlet / outlet port 11d of 1 by welding or the like, the split pin 117 is further pulled out, and the penetrating rod 16 is pulled out, and the silencer panel 4d can be moved on the guide rail 11 to the upstream side of the gas flow. Leave it in a good state.

Next, a belt such as a nylon sling (not shown) is wound around the silencer panel 4d, and a chain or chain block (not shown) is hung between the belt and the metal fitting 21 fixed to the tip of the temporary rail 20 by welding or the like. When the chain block is operated by operating the chain block, the silencer panel 4d is pulled out to the temporary rail 20 while moving in the channel of the guide rail 11. In this state, the worker can access both sides of the silencer panel 4d, so that the maintenance work can be easily performed. Note that 30a and 30b are panel support bases for temporary rails, and 31a and 31b are panel support bases 30.
The positioning piece is fixed to the a and 30b strips by welding or the like. Here, the panel support base 3 for these temporary rails
If the 0a, 30b and the positioning pieces 31a, 31b are fixed in advance in the duct on the upstream side of the exhaust silencer by welding or the like, the efficiency of positioning the temporary rail 20 during maintenance can be improved.

As described above, according to the first embodiment, the upper portion of the exhaust silencer duct having the shape sandwiching the silencer panel 4d from both sides is provided on the ceiling portion, and the weight of the silencer panel 4d is provided on the bottom surface of the duct. Since a guide rail 11 having a channel shape (concave shape) in cross section for supporting the guide rail 11 is provided, and the guide rail 11 is detachably provided with an upstream stopper 14 and a downstream stopper 15 in the pull-out direction of the silencer panel 4d. The temporary rail 20 is fixed to the upstream stopper 14
And by removing the downstream stopper 15, the silencer panel 4d can be easily pulled out,
Maintenance work can be easily performed.

In the illustrated embodiment, the case where the silencer panel 4d is pulled out to the upstream side of the exhaust gas has been described, but a temporary rail may be attached to the downstream side and pulled out to the downstream side.

(Second Embodiment) Next, the second embodiment of the present invention will be described.
The embodiment will be described with reference to FIGS. 4 to 6.
FIG. 4 is a diagram showing an example of the silencer panel 4d of the present embodiment, in which the silencer panel 4d is formed by the exhaust gas EG.
This is for preventing the sound absorbing material in d from vibrating left and right in the silencer panel 4d, which is a so-called flapping phenomenon. And in this example, the silencer panel 4
In d, one side plate is formed of a perforated plate 22, the other side plate is formed of a closing plate 23 having no holes, and a sound absorbing material 24 is enclosed in a space formed by these side plates.

As described above, when the silencer panel 4d is the silencer panel 4d having a structure in which the blocking plate 23 having no holes is attached to one side of the silencer panel 4d, the exhaust gas EG does not pass through the silencer panel 4d. Even if the pressure of the exhaust gas EG is alternately applied from the left to the right and from the right to the left of the silencer panel 4d due to the turbulence of the gas EG, the sound absorbing material 24 does not vibrate left and right and collide with the perforated plate 22. It is possible to prevent the material 24 from scattering.

In the example of FIG. 4 described above, in order to make the exhaust gas EG not pass through the silencer panel 4d, one side surface is the porous plate 22 and the other surface is the closing plate 23. As described above, the structure may be such that both surfaces are constituted by the perforated plates 22, the inner space is partitioned by the partition plate 25 into two spaces in the direction orthogonal to the flow direction of the exhaust gas, and the sound absorbing material 24 is enclosed in these two spaces. good.
5A is a sectional view when the silencer panel 4d is cut horizontally, and FIG. 5B is a sectional view of the sound absorbing material 24. In FIG. 5 (b), 24a is a sound absorbing material body, and 24b.
Is a cross, and 24c is a wire mesh.

Also in this case, similarly to the embodiment of FIG. 4, even if the pressure of the exhaust gas EG is alternately applied from the left to the right and from the right to the left of the silencer panel 4d due to the disturbance of the exhaust gas EG, the exhaust gas EG Does not pass through the silencer panel 4d, the sound absorbing material 24 does not vibrate left and right to collide with the perforated plate 22, and the sound absorbing material 24 can be prevented from scattering.

(Third Embodiment) Analysis by the inventors has revealed that the uppermost row, the lower portion, and the upper portion of the exhaust gas flow of the silencer panel 4d are easily scattered.
If the silencer panel 4d located at such a liable place is not filled with the sound absorbing material 24 in advance, when constructing the exhaust silencer 4, not only the cost can be suppressed but also the sound absorbing Since the silencer panel 4d in which the material 24 is not enclosed is provided, the exhaust silencer 4 that can be easily maintained can be constructed.

FIG. 6 is a view showing a sound absorbing material enclosed state of the silencer panel adopted in the third embodiment of the present invention. In FIG. 6, in order to facilitate understanding of the invention, the perforated plate and the like are omitted and only the arrangement state of the sound absorbing material 24 is shown. As an example, 15 silencer panels (# 1 to #
(15) are shown juxtaposed. Each silencer panel according to the present embodiment has a partition (not shown) inside thereof, and these partitions are partitioned into a number of sections in the longitudinal direction and the vertical direction. Here, in the example of FIG. 6, it is divided into four (A to D) sections in the longitudinal direction and 11 (1 to 11) sections in the vertical direction. Each of these compartments has a structure in which a sound absorbing material can be independently enclosed. The shaded area in FIG. 6 is filled with the sound absorbing material, and the non-hatched area is provided with the sound absorbing material. Not as a void.

Here, FIG. 6A is a perspective view showing the arrangement of the entire sound absorbing material, and FIG. 6B is # 1 or # in FIG. 6A.
15 is a side view showing the sound absorbing material arrangement of the silencer panel, FIG. 6 (c) is a side view showing the sound absorbing material arrangement of the silencer panel # 2 or # 14, and FIG. 6 (d) is # 3 to # 1.
It is a side view which shows the sound absorbing material arrangement of the silencer panel up to 3.

As shown in FIG. 6, the silencer panel 4
For each of the d, by constructing the entire silencer panel without enclosing the sound absorbing material 24 from the beginning in the section of the sound absorbing material 24 where the sound absorbing material is particularly likely to scatter, an exhaust silencer with less scattering of the sound absorbing material is configured. can do.

[0039]

As described above, in the first embodiment of the present invention, an upper guide having a shape sandwiching a silencer panel from both sides is provided on the upper surface of the duct, and a guide rail for supporting the weight of the silencer panel is provided on the lower surface of the duct. In the operating state of the gas turbine, an upstream stopper and a downstream stopper for positioning the silencer panel 4d in the longitudinal direction are detachably provided on this guide rail. When performing maintenance work, a temporary rail is attached to the guide rail. I fixed it.

As a result, at the time of maintenance, by removing the upstream stopper or the downstream stopper,
The silencer panel can be easily pulled out to the temporary rail, and the extremely narrow work inside the exhaust duct 2 such as cutting the welded parts of the upper and lower stoppers, installing the guide rail, installing the work scaffold, etc., which was required in the prior art. It is possible to avoid work in places where it is difficult to perform maintenance, and it is possible to greatly reduce the cost and work time for maintenance work.

Further, according to the second and third embodiments of the present invention, the sound absorbing material 21 is disposed at a place where the sound absorbing material 24 is largely scattered.
Partition plate 25 inside the silencer panel 4d without enclosing
Since the silencer panel 4d has a structure in which the sound absorbing member 24 is installed or a structure in which the closing plate 25 is attached to one side, the sound absorbing material 24 does not scatter, so that a stable sound absorbing effect can be maintained and the silencer panel can be used for a long period of time. Can be used.

[Brief description of drawings]

FIG. 1 is a view showing a silencer panel upper mounting structure of an exhaust silencer showing a first embodiment of the present invention,
(A) is a perspective view and (b) is a plan view.

FIG. 2 is a perspective view showing a silencer panel lower part mounting structure of the exhaust silencer showing the first embodiment of the invention.

FIG. 3 is a plan view showing a silencer panel lower mounting structure of the exhaust silencer showing the first embodiment of the present invention, and FIG. 3 (a) is a plan view showing a relative positional relationship between a lower panel support and a positioning piece. , (B) is a plan view of the guide rail 10.

FIG. 4 is a sectional view showing an example of a silencer panel adopted in the second embodiment of the present invention.

FIG. 5 is a diagram showing another example of the silencer panel adopted in the second embodiment of the present invention, in which (a) is a sectional view,
(B) is sectional drawing of a sound absorbing material.

6A and 6B are views showing a sound absorbing material enclosing state of a silencer panel adopted in a third embodiment of the present invention, in which FIG. 6A is an overall perspective view, and FIGS. Side view.

FIG. 7 is a schematic diagram of an exhaust system of a combined cycle system.

FIG. 8 is a front view of a conventional exhaust silencer.

FIG. 9 is a cross-sectional view of a conventional exhaust silencer seen from above.

[Explanation of symbols]

1 ... Gas turbine, 2 ... Exhaust duct, 3 ... Exhaust heat recovery boiler, 4 ... Exhaust silencer 4bu ... Duct ceiling plate, 4bl
... Duct bottom surface, 4c ... Spacer, 4d ... Silencer panel, 5, 51, 52 ... Upper supporting portion, 6 ... Lower supporting portion, 1
0 ... Positioning piece, 11 ... Guide rail, 14 ... Upstream stopper, 15 ... Downstream stopper, 16, 18 ... Penetrating rod,
17, 19 ... Fall-out preventing piece, 20 ... Temporary rail, 21 ... Chain block mounting metal fitting, 22 ... Perforated plate, 23 ... Closure plate, 24 ... Sound absorbing material, 25 ... Partition plate, 71 ... Upper support panel, 81 ... Guide Member, 91 ... Lower support panel.

Claims (6)

[Claims] 1. A gas turbine exhaust silencer for reducing noise by guiding exhaust gas discharged from a gas turbine into a duct and passing it between a plurality of silencer panels juxtaposed in a downward direction of the exhaust gas in the duct. Each of the silencer panels is provided at a predetermined position on the upper surface of the duct, has a guide member that guides and supports the silencer panel from both sides thereof, and has a lower surface of the duct that has an inlet / outlet port for the silencer panel and the silencer panel. Positioned by a guide rail that slidably supports in the longitudinal direction, and a detachable stopper that is provided on the guide rail and that fixes the silencer panel at predetermined installation positions upstream and downstream in the exhaust gas flow direction. A gas turbine exhaust silencer characterized by the following. 2. The gas turbine exhaust silencer according to claim 1, wherein a temporary rail is provided so as to be freely attached to the inlet / outlet port of the silencer panel of the guide rail. 3. The detachable stopper is fixed together with the guide rail in a state of being housed in the groove of the guide rail by a penetrating rod that can be inserted and removed from the lateral direction,
The gas turbine exhaust silencer according to claim 1, wherein the through-rods are provided with drop-out prevention pieces at both ends. 4. A gas turbine exhaust silencer for reducing noise by guiding exhaust gas discharged from a gas turbine into a duct and passing it between a plurality of silencer panels juxtaposed in a downward direction of the exhaust gas in the duct. A gas turbine exhaust silencer, wherein each of the silencer panels has a side plate that is in contact with the exhaust gas flow passage and has a closing plate, and the other side face is a porous plate. 5. A gas turbine exhaust silencer for reducing noise by guiding exhaust gas discharged from a gas turbine into a duct and passing it between a plurality of silencer panels juxtaposed in a downward direction of the exhaust gas in the duct. Each of the silencer panels is provided with a partition plate for partitioning the inside of the silencer panel in a direction intersecting with a flow direction of exhaust gas, while forming both side plates of the silencer panel with perforated plates. Silencer. 6. A gas turbine exhaust silencer for reducing noise by guiding exhaust gas discharged from a gas turbine into a duct and passing it between a plurality of silencer panels juxtaposed in a downward direction of the exhaust gas in the duct. A gas turbine exhaust silencer characterized in that the silencer panel is divided into a longitudinal direction and an up-down direction inside, and a silencer panel not enclosing a sound absorbing material is arranged in a specific position in a part of the section. .