Exhaust system and gas turbine equipped with same

Abstract

An exhaust apparatus includes a first outer diffuser, a second outer diffuser, an exhaust chamber covering an outer peripheral side of the first outer diffuser, an exhaust chamber covering an outer side of the second outer diffuser, a first annular seal device, a second annular seal device, and a third annular seal device. The first annular sealing device is disposed so as to be able to suppress the inflow of exhaust gas between the first outer diffuser and the exhaust chamber, and the second annular sealing device is disposed so as to be able to suppress the inflow of exhaust gas between the second outer diffuser and the exhaust chamber. The third annular sealing device is disposed between the first annular sealing device and the second annular sealing device, and is disposed so as to be able to suppress the flow of the exhaust gas to the first annular sealing device side.

Description

Technical Field

[0001] The present invention relates to an exhaust device forming an exhaust flow path through which exhaust gas passes after a turbine rotor of a gas turbine is rotated, and a gas turbine equipped with the exhaust device.

[0002] This application claims priority based on Japanese Patent Application No. 2024-042420 filed in Japan on March 18, 2024, the contents of which are incorporated herein by reference. Background Art

[0003] A gas turbine includes: a compressor that compresses external air to generate compressed air; a combustor that mixes fuel with the compressed air and burns them to generate combustion gas; a turbine that is driven by the combustion gas; and exhaust equipment. The turbine includes a turbine rotor that can rotate about an axis and a turbine chamber that covers the outer circumference of the turbine rotor. The turbine rotor includes a rotor shaft that extends in the axial direction about the axis and a plurality of blade rows mounted on the rotor shaft. The plurality of blade rows are arranged in the axial direction at intervals from each other. Each of the plurality of blade rows includes a plurality of blades arranged in a circumferential direction relative to the axis.

[0004] Exhaust equipment defines an exhaust flow path for combustion gas, or exhaust gas, that has passed through multiple blade rows of a turbine rotor. This exhaust equipment, as described in Patent Document 1 below, includes a first outer diffuser, a second outer diffuser, an exhaust casing, an exhaust chamber, a first annular seal, and a second annular seal.

[0005] The first outer diffuser is cylindrical with the axis as the center, and defines the radial outer edge of the upstream part of the exhaust flow path. The first outer diffuser covers the outer periphery of the part on the downstream side of the axis where there is no moving blade in the turbine rotor. The exhaust chamber is cylindrical with the axis as the center, and covers the outer periphery of the first outer diffuser. The first outer diffuser and the exhaust chamber are both connected to the end on the downstream side of the axis of the turbine chamber. The second outer diffuser is cylindrical with the axis as the center, and defines the radial outer edge of the downstream part of the exhaust flow path. The exhaust chamber is cylindrical with the axis as the center, and covers the outer periphery of the second outer diffuser. The second outer diffuser is spaced apart from the first outer diffuser on the downstream side of the axis so as to allow thermal expansion of the first outer diffuser in the axial direction.

[0006] The first annular sealing device is provided from the end portion on the downstream side of the axis of the first outer diffuser to the end portion on the downstream side of the axis of the exhaust chamber in such a manner as to suppress the inflow of exhaust gas between the first outer diffuser and the exhaust chamber. That is, the first annular sealing device serves to seal the first outer space between the inner circumference of the exhaust chamber and the outer circumference of the first outer diffuser and the exhaust flow path. The second annular sealing device is provided from the end portion on the upstream side of the axis of the second outer diffuser to the end portion on the upstream side of the axis of the exhaust chamber so as to suppress the inflow of exhaust gas between the second outer diffuser and the exhaust chamber. That is, the second annular sealing device serves to seal the second outer space between the inner circumference of the exhaust chamber and the outer circumference of the second outer diffuser and the exhaust flow path.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: International Publication No. 2013 / 132692 Summary of the Invention

[0010] Problems to be solved by the invention

[0011] In recent years, combustion gas temperatures have increased to improve gas turbine efficiency. Consequently, the potential for thermal damage to the first and second annular seals has increased. If the first annular seal is damaged, high-temperature exhaust gas will flow into the first outer space, significantly reducing the cooling effect of the air in the first outer space on the first outer diffuser, potentially causing thermal damage to the first outer diffuser.

[0012] Therefore, an object of the present disclosure is to provide an exhaust device and a gas turbine equipped with the exhaust device that can suppress the flow of exhaust gas between the inner peripheral side of the exhaust casing and the outer peripheral side of the first outer diffuser, or the flow of exhaust gas between the inner peripheral side of the exhaust chamber and the outer peripheral side of the second outer diffuser.

[0013] Means for solving problems

[0014] An exhaust device according to one embodiment of the invention for achieving the above-mentioned object comprises: a first outer diffuser having a cylindrical shape with an axis as the center, defining a radially outer edge of an upstream portion of an exhaust flow path through which exhaust gas after rotating a turbine rotor passes; a second outer diffuser arranged spaced apart from the first outer diffuser on the downstream side of the axis, one of the upstream side and the downstream side in the axial direction in which the axis extends, and having a cylindrical shape with the axis as the center, defining a radially outer edge of a downstream portion of the exhaust flow path through which exhaust gas passing through the first outer diffuser passes; an exhaust casing having a cylindrical shape with the axis as the center, covering an outer peripheral side of the first outer diffuser; an exhaust chamber having a cylindrical shape with the axis as the center, covering an outer side of the second outer diffuser; a first annular sealing device having an annular shape with the axis as the center; a second annular sealing device having an annular shape with the axis as the center; and a third annular sealing device having an annular shape with the axis as the center. The exhaust chamber comprises: an exhaust chamber main body having a cylindrical shape with the axis as the center, and an exhaust chamber flange extending radially outward relative to the axis from the end portion of the exhaust chamber main body on the downstream side of the axis. The exhaust chamber comprises: an exhaust chamber main body having a cylindrical shape with the axis as the center, and an exhaust chamber flange extending radially outward from the end portion of the exhaust chamber main body on the upstream side of the axis and connected to the exhaust chamber flange. The first annular sealing device is provided on the first outer diffuser in such a manner as to suppress the flow of the exhaust gas into the first outer space between the first outer diffuser and the exhaust chamber main body. The second annular sealing device is provided on the second outer diffuser in such a manner as to suppress the flow of the exhaust gas into the second outer space between the second outer diffuser and the exhaust chamber main body. The third annular sealing device is arranged between the first annular sealing device and the second annular sealing device in the axial direction. The third annular sealing device is provided at the end portion on the downstream side of the axis of the first outer diffuser in a manner capable of suppressing the flow of the exhaust gas toward the first annular sealing device, or is provided at the end portion on the upstream side of the axis of the second outer diffuser in a manner capable of suppressing the flow of the exhaust gas toward the second annular sealing device.

[0015] In this aspect, the first annular sealing device can suppress the inflow of the exhaust gas into the first outer space, and the second annular sealing device can suppress the inflow of the exhaust gas into the second outer space.

[0016] Furthermore, in this embodiment, the third annular sealing device can suppress the flow of exhaust gas toward the first annular sealing device or toward the second annular sealing device. That is, in this embodiment, the first and third annular sealing devices can suppress the flow of exhaust gas into the first outer space, while the second and third annular sealing devices can suppress the flow of exhaust gas into the second outer space.

[0017] If high-temperature exhaust gas flows into the first outer space, the cooling effect of the air in the first outer space on the first outer diffuser will be significantly reduced, and the first outer diffuser may be thermally damaged.

[0018] In this embodiment, even if the third annular sealing device is damaged by the heat of the exhaust gas, the first annular sealing device can still suppress the flow of exhaust gas into the first outer space. Therefore, in this embodiment, thermal damage to the first outer diffuser caused by the flow of high-temperature exhaust gas into the first outer space can be suppressed. Alternatively, in this embodiment, thermal damage to the second outer diffuser caused by the flow of high-temperature exhaust gas into the second outer space can be suppressed for the same reason.

[0019] Some gas turbine-equipped plants include an exhaust heat recovery boiler that generates steam using the heat of exhaust gas discharged from the gas turbine. In this case, the present embodiment can suppress a decrease in the amount of exhaust gas supplied to the exhaust heat recovery boiler due to leakage of exhaust gas from the exhaust flow path.

[0020] A gas turbine as one embodiment of the invention for achieving the above-mentioned purpose comprises: the exhaust equipment of the embodiment; a compressor capable of compressing air to generate compressed air; a combustor capable of burning fuel in the compressed air to generate combustion gas; and a turbine capable of being driven by the combustion gas from the combustor. The turbine comprises: a turbine rotor capable of rotating about the axis; and a turbine chamber covering the outer periphery of the turbine rotor. The turbine rotor comprises: a rotor shaft extending in the axial direction about the axis; and a plurality of moving blade cascades arranged in the axial direction at intervals and mounted on the rotor shaft. The turbine chamber covers the outer periphery of the portion of the turbine rotor where the plurality of moving blade cascades are present. The exhaust chamber of the exhaust equipment is connected to the end of the turbine chamber on the downstream side of the axis.

[0021] Effects of the Invention

[0022] In the present disclosure, it is possible to suppress the inflow of exhaust gas between the inner peripheral side of the exhaust casing and the outer peripheral side of the first outer diffuser, or the inflow of exhaust gas between the inner peripheral side of the exhaust chamber and the outer peripheral side of the second outer diffuser. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cutaway side view of a main portion of a gas turbine according to an embodiment of the present disclosure.

[0024] Figure 2 This is a cross-sectional view of a main part of a gas turbine according to an embodiment of the present disclosure.

[0025] Figure 3 yes Figure 2 An enlarged view of part III in FIG.

[0026] Figure 4 yes Figure 3 An enlarged view of section IV in FIG.

[0027] Figure 5 yes Figure 3 An enlarged view of the V portion.

[0028] Figure 6 It is an explanatory diagram showing a process of arranging spacers according to one embodiment of the present disclosure.

[0029] Figure 7 It is an explanatory diagram showing a process of arranging a spacer movement inhibitor according to one embodiment of the present disclosure.

[0030] Figure 8 It is an explanatory diagram showing the arrangement process of the third sealing assembly according to one embodiment of the present disclosure.

[0031] Figure 9 It is an explanatory diagram showing the arrangement and shape of the sealing plate groups of each of the plurality of third sealing assemblies of the comparative example.

[0032] Figure 10 It is an explanatory diagram showing the arrangement and shape of the sealing plate groups of each of the plurality of third sealing assemblies according to one embodiment of the present disclosure.

[0033] Figure 11 It is a perspective view of a spacer movement suppressor and a clamp according to a modified example of the present disclosure.

[0034] Figure 12 It is a side view of a spacer movement suppressor according to a modified example of the present disclosure.

[0035] Figure 13 yes Figure 12 Cross-sectional view along line XIII-XIII.

[0036] Figure 14These are explanatory diagrams showing a mounting procedure (part 1) and a removal procedure of a spacer movement suppressing member according to a modified example of the present disclosure.

[0037] Figure 15 yes Figure 14 XV-XV line sectional view.

[0038] Figure 16 This is an explanatory diagram showing a mounting procedure (part 2) of a spacer movement suppressing member according to a modified example of the present disclosure.

[0039] Figure 17 yes Figure 16 Cross-sectional view along line XVII-XVII.

[0040] Description of reference numerals:

[0041] 1: Gas turbine rotor

[0042] 2: Burner

[0043] 6: Intermediate machine room

[0044] 10: Compressor

[0045] 11: Compressor rotor

[0046] 12: Rotor shaft

[0047] 13: Moving blades

[0048] 14: Stationary blades

[0049] 15: Compressor room

[0050] 20: Turbine

[0051] 21: Turbine rotor

[0052] 22: Rotor shaft

[0053] 23: Moving blades

[0054] 24: Stationary blades

[0055] 25: Turbine room

[0056] 26: Bearings

[0057] 27: Bearing box

[0058] 28: Pillar

[0059] 29: Pillar cover

[0060] 30: Exhaust equipment

[0061] 31: First inner diffuser

[0062] 32: Second inner diffuser

[0063] 33: Sealing device

[0064] 40: First outer diffuser

[0065] 41: First outer diffuser body

[0066] 42: First outer diffuser end

[0067] 43: First outer diffuser end surface

[0068] 44: Sealing surface

[0069] 45: Second outer diffuser

[0070] 46: Second outer diffuser body

[0071] 47: Second outer diffuser end

[0072] 48: Second outer diffuser end face

[0073] 49: Sealing surface

[0074] 50: Exhaust room

[0075] 51: Exhaust chamber main body

[0076] 52: Exhaust room flange

[0077] 53: Connection

[0078] 54: Exhaust chamber contact surface

[0079] 55: Avoidance

[0080] 56: Exhaust room avoidance surface

[0081] 56a: Avoidance surface of the first exhaust room

[0082] 56b: Second exhaust room avoidance surface

[0083] 60: Exhaust chamber

[0084] 61: Exhaust chamber body

[0085] 62: Exhaust chamber flange

[0086] 63: Connection

[0087] 64: Exhaust chamber contact surface

[0088] 65: Avoidance Department

[0089] 66: Exhaust chamber avoidance surface

[0090] 66a: First exhaust chamber avoidance surface

[0091] 66b: Second exhaust chamber avoidance surface

[0092] 69: Flange connection bolts

[0093] 70a: First annular sealing device

[0094] 71a: First sealing component

[0095] 72ad: Downstream sealing plate assembly

[0096] 72au: Upstream sealing plate assembly

[0097] 73a: Spacer

[0098] 74a: First outer mounting member

[0099] 75a: First outer pressing plate (or, first member)

[0100] 76a: First outer mounting bolt

[0101] 77a: First inner mounting member

[0102] 78a: First inner pressing plate

[0103] 79a: First inner mounting bolt

[0104] 70b: Second annular sealing device

[0105] 71b: Second sealing component

[0106] 72bd: Downstream sealing plate assembly

[0107] 72bu: Upstream side sealing plate assembly

[0108] 73b: Spacer

[0109] 74b: Second outer mounting piece

[0110] 75b: Second outer pressing plate (or, second member)

[0111] 76b: Second outer mounting bolt

[0112] 76h: Bolt head

[0113] 77b: Second inner mounting piece

[0114] 78b: Second inner pressing plate

[0115] 79b: Second inner mounting bolt

[0116] 80: Third annular sealing device

[0117] 81, 81c: Third sealing component

[0118] 82, 82a, 82b, 82c: Sealing plate assembly

[0119] 83, 83a, 83b: Sealing plate

[0120] 84: Outer frame

[0121] 85: Inner frame

[0122] 86: Outer pin

[0123] 87: Inner pin

[0124] 89: Welding Department

[0125] 90: Spacer

[0126] 91: Outer frame contact surface

[0127] 92: Frame side concave part

[0128] 93; Press plate contact surface

[0129] 94: Press plate side recess

[0130] 95, 100: Spacer movement inhibitor

[0131] 96: Spring

[0132] 97, 101: Spring support frame

[0133] 102: Frame body

[0134] 102p: Component contact surface

[0135] 103: Frame flange

[0136] 98, 105: Spring cover

[0137] 106: Cover body

[0138] 106p: Spacer contact surface

[0139] 107: Cover flange

[0140] 99a, 99b, 110: fixture

[0141] 111: Clamp into fixture

[0142] 112: Finger support rod

[0143] 112h: hole

[0144] 113: First Finger

[0145] 113t: First cone

[0146] 114: Second finger

[0147] 114t: Second cone

[0148] 115: Press Bar

[0149] HG: exhaust gas

[0150] HP: Exhaust flow path

[0151] S1: First outer space

[0152] S2: Second outer space

[0153] S3: Frame-avoidance surface

[0154] Pr: Configure the preset position

[0155] SR: Sealed Plate Array

[0156] Ar: axis

[0157] Ac: Central axis

[0158] Da: Axis direction

[0159] Dau: Upstream side of axis

[0160] Dad: downstream side of the axis

[0161] Dc: circumferential

[0162] Dr: Radial

[0163] Dri: Radial Inner

[0164] Dro: radial outward

[0165] Dac: Center axis. DETAILED DESCRIPTION

[0166] Below, refer to Figures 1 to 10 An embodiment of the gas turbine according to the present invention will be described in detail.

[0167] like Figure 1 As shown, the gas turbine of this embodiment includes: a compressor 10, which can compress external air to generate compressed air; a combustor 2, which can burn fuel from a fuel supply source in compressed air to generate combustion gas; a turbine 20, which can be driven by the combustion gas; and an exhaust device 30.

[0168] The compressor 10 has a compressor rotor 11 that rotates about an axis Ar, a compressor casing 15 that covers the compressor rotor 11, and a plurality of stationary blade cascades 14. The turbine 20 has a turbine rotor 21 that rotates about an axis Ar, a turbine casing 25 that covers the turbine rotor 21, and a plurality of stationary blade cascades 24. It should be noted that, hereinafter, the direction in which the axis Ar extends is referred to as the axial direction Da, the circumferential direction centered on the axis Ar is referred to as simply the circumferential direction Dc, and the direction perpendicular to the axis Ar is referred to as the radial direction Dr. In addition, one side of the axial direction Da is referred to as the axial upstream side Dau, and the opposite side is referred to as the axial downstream side Dad. In addition, the side closer to the axis Ar in the radial direction Dr is referred to as the radial inner side Dri, and the opposite side is referred to as the radial outer side Dro.

[0169] The compressor 10 is arranged on the axial upstream side Dau with respect to the turbine 20 .

[0170] The compressor rotor 11 and the turbine rotor 21 are located on the same axis Ar and are connected to each other to form the gas turbine rotor 1. For example, a generator rotor is connected to the gas turbine rotor 1. The gas turbine further includes an intermediate chamber 6. The intermediate chamber 6 is arranged between the compressor chamber 15 and the turbine chamber 25 in the axial direction Da. The combustor 2 is installed in the intermediate chamber 6. The compressor chamber 15, the intermediate chamber 6, and the turbine chamber 25 are connected to each other.

[0171] The compressor rotor 11 includes a rotor shaft 12 extending along an axial direction Da with the axis Ar as its center, and a plurality of rotor blade rows 13 mounted on the rotor shaft 12. The plurality of rotor blade rows 13 are arranged along the axial direction Da. Each rotor blade row 13 is composed of a plurality of rotor blades arranged along a circumferential direction Dc. One of a plurality of stationary blade rows 14 is arranged on the axial downstream side Dad of each of the plurality of rotor blade rows 13. Each stationary blade row 14 is installed inside the compressor casing 15. Each stationary blade row 14 is composed of a plurality of stationary blades arranged along the circumferential direction Dc.

[0172] The turbine rotor 21 includes a rotor shaft 22 extending in an axial direction Da about the axis Ar, and a plurality of rotor blade cascades 23 mounted on the rotor shaft 22. The plurality of rotor blade cascades 23 are arranged in the axial direction Da. Each rotor blade cascade 23 is composed of a plurality of rotor blades arranged in a circumferential direction Dc. One of a plurality of stationary blade cascades 24 is arranged on the axial upstream side Dau of each of the plurality of rotor blade cascades 23. Each stationary blade cascade 24 is installed inside a turbine housing 25. Each stationary blade cascade 24 is composed of a plurality of stationary blades arranged in a circumferential direction Dc.

[0173] An annular space between the outer circumference of the rotor shaft 22 and the inner circumference of the turbine casing 25 , in which the rotor blade cascade 23 and the stationary blade cascade 24 are arranged in the axial direction Da, constitutes a combustion gas flow path through which the combustion gas from the combustor 2 flows.

[0174] The exhaust system 30 is located on the axially downstream side Dad of the turbine casing 25. This exhaust system 30 defines an exhaust flow path HP through which exhaust gas HG, the combustion gas, passes after passing through the plurality of moving blade cascades 23 of the turbine rotor 21. This exhaust flow path HP is annular centered on the axis Ar and extends in the axial direction Da.

[0175] like Figure 2 As shown, the exhaust equipment 30 has a first inner diffuser 31, a first outer diffuser 40, a second inner diffuser 32, a second outer diffuser 45, an exhaust chamber 50, an exhaust chamber 60, a first annular sealing device 70a, a second annular sealing device 70b and a third annular sealing device 80.

[0176] The first inner diffuser 31 is cylindrical centered on the axis Ar and defines the radially inner edge Dri of the upstream portion of the exhaust flow path HP. The first inner diffuser 31 covers the outer periphery of the axially downstream portion Dad of the turbine rotor 21 where the rotor blade cascade 23 is not present.

[0177] The first outer diffuser 40 is cylindrical with the axis Ar as the center, and defines the edge of the radially outer side Dro of the upstream part of the exhaust flow path HP. Therefore, the first outer diffuser 40 is arranged on the outer peripheral side of the first inner diffuser 31. The exhaust chamber 50 is cylindrical with the axis Ar as the center, and covers the outer peripheral side of the first outer diffuser 40. The exhaust chamber 50 is connected to the end of the axial downstream side Dad of the turbine chamber 25. In addition, the first outer diffuser 40 is indirectly connected to the end of the axial downstream side Dad of the turbine chamber 25. A first outer space S1 into which cooling air can flow is formed between the inner peripheral side of the exhaust chamber 50 and the outer peripheral side of the first outer diffuser 40.

[0178] Provided on the inner circumference of the first inner diffuser 31 are: a bearing 26 that rotatably supports the portion of the turbine rotor 21 on the downstream side Dad of the axis where the moving blades 23 are not provided; and a bearing box 27 that covers the outer circumference of the bearing 26 and supports the bearing 26. The exhaust chamber 50 and the bearing box 27 are connected by a plurality of struts 28 that pass through the first outer diffuser 40 and the first inner diffuser 31. The plurality of struts 28 are arranged in the circumferential direction Dc at intervals from each other. The exhaust gas HG flows between the plurality of struts 28. Each strut 28 is covered by a strut cover 29 along its extension direction. One end portion of the strut cover 29 in the extension direction is mounted on the first outer diffuser 40, and the other end portion is mounted on the first inner diffuser 31.

[0179] The second inner diffuser 32 is cylindrical, centered on the axis Ar, and defines the radially inner edge Dri of the downstream portion of the exhaust flow path HP. The second inner diffuser 32 is spaced apart from the first inner diffuser 31 on the axial downstream side Dad to accommodate thermal expansion of the first inner diffuser 31 in the axial direction Da. To prevent exhaust gas HG from leaking out of the exhaust flow path HP from between the first inner diffuser 31 and the second inner diffuser 32, a seal 33 is provided between them. The second outer diffuser 45 is cylindrical, centered on the axis Ar, and defines the radially outer edge Dro of the downstream portion of the exhaust flow path HP. Therefore, the second outer diffuser 45 is disposed on the outer periphery of the second inner diffuser 32. The second outer diffuser 45 is spaced apart from the first outer diffuser 40 on the axial downstream side Dad to accommodate thermal expansion of the first outer diffuser 40 in the axial direction Da. The exhaust chamber 60 is cylindrical, centered on the axis Ar, and covers the outer periphery of the second outer diffuser 45. The axial upstream end Dau of the exhaust chamber 60 is connected to the axial downstream end Dad of the exhaust casing 50. A second outer space S2 is defined between the inner periphery of the exhaust chamber 60 and the outer periphery of the second outer diffuser 45.

[0180] The first annular sealing device 70 a , the second annular sealing device 70 b , and the third annular sealing device 80 are all annular in shape with the axis Ar as the center.

[0181] The first annular seal 70a is positioned from the axial downstream end Dad of the first outer diffuser 40 to the axial downstream end Dad of the exhaust casing 50 to prevent the exhaust gas HG from flowing into the first outer space S1 between the first outer diffuser 40 and the exhaust casing 50. Specifically, the first annular seal 70a seals the first outer space S1 from the exhaust passage HP. The second annular seal 70b is positioned from the axial upstream end Dau of the second outer diffuser 45 to the axial upstream end Dau of the exhaust chamber 60 to prevent the exhaust gas HG from flowing into the second outer space S2 between the second outer diffuser 45 and the exhaust chamber 60. Specifically, the second annular seal 70b seals the second outer space S2 from the exhaust passage HP. The third annular seal 80 is positioned between the first and second annular seals 70a and 70b in the axial direction Da to prevent the exhaust gas HG from flowing toward the first annular seal 70a.

[0182] like Figure 3 and Figure 5As shown, the exhaust casing 50 includes an exhaust casing body 51 having a cylindrical shape centered on the axis Ar, and an exhaust casing flange 52 extending radially outward Dro from the end of the exhaust casing body 51 on the axial downstream side Dad. The exhaust casing flange 52 includes a connecting portion 53 having a disk shape centered on the axis Ar, and a relief portion 55 having a disk shape centered on the axis Ar and connected to the inner circumference of the connecting portion 53. The connecting portion 53 includes an exhaust casing contact surface 54 facing the axial downstream side Dad and in contact with the exhaust chamber 60. The relief portion 55 includes an exhaust casing relief surface 56 located radially inward Dri and axially upstream Dau relative to the exhaust casing contact surface 54. The exhaust casing relief surface 56 includes a first exhaust casing relief surface 56a and a second exhaust casing relief surface 56b located radially inward Dri and axially upstream Dau relative to the first exhaust casing relief surface 56a.

[0183] like Figure 3 and Figure 4 As shown, the first outer diffuser 40 includes a first outer diffuser body 41 having a cylindrical shape centered on the axis Ar, and a first outer diffuser end portion 42 provided at the end of the first outer diffuser body 41 on the axial downstream side Dad. The first outer diffuser end portion 42 includes a first outer diffuser end surface 43 located closest to the axial downstream side Dad in the first outer diffuser 40 and facing the axial downstream side Dad, and a seal receiving surface 44 located on the axial upstream side Dau and radially outward Dro relative to the first outer diffuser end surface 43 and facing the axial downstream side Dad.

[0184] like Figure 3 and Figure 5 As shown, the exhaust chamber 60 includes an exhaust chamber body 61 having a cylindrical shape centered on the axis Ar, and an exhaust chamber flange 62 extending radially outward Dro from the end of the exhaust chamber body 61 on the axial upstream side Dau. The exhaust chamber flange 62 includes a connecting portion 63 having a disc shape centered on the axis Ar, and a relief portion 65 having a disc shape centered on the axis Ar and connected to the inner circumference of the connecting portion 63. The connecting portion 63 includes an exhaust chamber contact surface 64 that faces the axial upstream side Dau and contacts the exhaust casing contact surface 54. The connecting portion 63 of the exhaust chamber flange 62 is connected to the connecting portion 53 of the exhaust casing flange 52 by flange connecting bolts 69. The relief portion 65 includes an exhaust chamber relief surface 66 located radially inward Dri and axially downstream Dad relative to the exhaust chamber contact surface 64, and facing the exhaust casing relief surface 56 with a gap in the axial direction Da. The exhaust chamber relief surface 66 includes a first exhaust chamber relief surface 66a and a second exhaust chamber relief surface 66b located radially inward Dri and axially downstream Dad relative to the first exhaust chamber relief surface 66a.

[0185] like Figure 3 and Figure 4 As shown, the second outer diffuser 45 includes a second outer diffuser body 46, which is cylindrical and centered on the axis Ar, and a second outer diffuser end portion 47, which is located at the end of the second outer diffuser body 46 on the axial upstream side Dau. The second outer diffuser end portion 47 includes a second outer diffuser end surface 48, which is located closest to the axial upstream side Dau in the second outer diffuser 45 and faces the axial upstream side Dau; and a seal receiving surface 49, which is located on the axial downstream side Dad and radially outward Dro relative to the second outer diffuser end surface 48 and faces the axial upstream side Dau. As described above, the second outer diffuser 45 is spaced apart from the first outer diffuser 40 on the axial downstream side Dad. Therefore, a gap exists between the first outer diffuser end surface 43 and the second outer diffuser end surface 48 in the axial direction Da.

[0186] The first annular sealing device 70a includes a plurality of first sealing components 71a arranged along the circumferential direction Dc, a plurality of first outer mounting members 74a arranged along the circumferential direction Dc, and a plurality of first inner mounting members 77a arranged along the circumferential direction Dc.

[0187] like Figures 3 to 5 As shown, each of the multiple first seal assemblies 71a includes a downstream seal plate assembly 72ad, an upstream seal plate assembly 72au, and a spacer 73a. Both the downstream seal plate assembly 72ad and the upstream seal plate assembly 72au are bundles of seal plates formed by overlapping seal plates extending in the radial direction Dr and the circumferential direction Dc in the axial direction Da. The downstream seal plate assembly 72ad is located on the downstream side Dad of the upstream seal plate assembly 72au.

[0188] The spacer 73a is disposed between the downstream seal plate assembly 72ad and the upstream seal plate assembly 72au in the axial direction Da, maintaining the spacing between the downstream seal plate assembly 72ad and the upstream seal plate assembly 72au in the axial direction Da. The radially outer side Dro portion of the upstream seal plate assembly 72au of each of the plurality of first seal assemblies 71a contacts the second exhaust casing relief surface 56b of the exhaust casing flange 52. Furthermore, the radially inner side Dri portion of the upstream seal plate assembly 72au of each of the plurality of first seal assemblies 71a contacts the seal receiving surface 44 of the first outer diffuser end portion 42.

[0189] The first outer mounting member 74a includes a first outer pressing plate 75a that presses the radially outer portion Dro of the first seal assembly 71a against the second exhaust casing relief surface 56b of the exhaust casing flange 52, and a first outer mounting bolt 76a that mounts the first outer pressing plate 75a to the exhaust casing flange 52. The first outer pressing plate 75a contacts the radially outer portion Dro of the first seal assembly 71a and the first exhaust casing relief surface 56a of the exhaust casing flange 52. The radially outer portion Dro of the first seal assembly 71a is sandwiched between the first outer pressing plate 75a and the second exhaust casing relief surface 56b of the exhaust casing flange 52. The first outer mounting bolt 76a penetrates the portion of the first outer pressing plate 75a that contacts the first exhaust casing relief surface 56a in the axial direction Da and is screwed into the exhaust casing flange 52. The first outer mounting bolt 76a does not penetrate the first seal assembly 71a in the axial direction Da. Therefore, the radially outer side Dro portion of the first seal assembly 71a sandwiched between the first outer pressing plate 75a and the second exhaust casing relief surface 56b of the exhaust casing flange 52 can move in the radial direction Dr. Therefore, the first seal assembly 71a of this embodiment allows thermal expansion in the radial direction Dr.

[0190] The first inner mounting member 77a includes a first inner pressing plate 78a for pressing the radially inner portion Dri of the first seal assembly 71a against the seal receiving surface 44 of the first outer diffuser end portion 42, and a first inner mounting bolt 79a for mounting the first inner pressing plate 78a to the first outer diffuser end portion 42. The first inner mounting bolt 79a penetrates the first inner pressing plate 78a and the radially inner portion Dri of the first seal assembly 71a along the axial direction Da and is screwed into the first outer diffuser end portion 42.

[0191] As described above, in this embodiment, the first outer pressing plate 75a is secured to the exhaust casing flange 52 using first outer mounting bolts 76a that penetrate along the axial direction Da through the portion of the first outer pressing plate 75a that contacts the first exhaust casing relief surface 56a. Furthermore, in this embodiment, the first inner pressing plate 78a and the first seal assembly 71a are secured to the first outer diffuser end portion 42 using first inner mounting bolts 79a that penetrate along the axial direction Da through the radially inner portion Dri of the first inner pressing plate 78a and the first seal assembly 71a. Therefore, in this embodiment, when installing the first annular seal 70a, space must be secured to allow the first outer mounting bolts 76a and the first inner mounting bolts 79a to move along the axial direction Da. Therefore, in this embodiment, when installing and removing the first annular seal 70a to the target position, the exhaust chamber 60 is separated from the exhaust casing 50 to ensure this space.

[0192] The second annular sealing device 70 b includes a plurality of second sealing assemblies 71 b arranged along the circumferential direction Dc, a plurality of second outer mounting members 74 b arranged along the circumferential direction Dc, and a plurality of second inner mounting members 77 b arranged along the circumferential direction Dc.

[0193] Each of the multiple second sealing assemblies 71b includes a downstream sealing plate group 72bd, an upstream sealing plate group 72bu, and a spacer 73b. Both the downstream sealing plate group 72bd and the upstream sealing plate group 72bu are bundles of sealing plates formed by overlapping multiple sealing plates extending in the radial direction Dr and the circumferential direction Dc in the axial direction Da. The downstream sealing plate group 72bd is located on the downstream side Dad of the upstream sealing plate group 72bu. The spacer 73b is positioned between the downstream sealing plate group 72bd and the upstream sealing plate group 72bu in the axial direction Da to maintain the gap between the downstream sealing plate group 72bd and the upstream sealing plate group 72bu in the axial direction Da. The radially outer side Dro of the downstream sealing plate group 72bd of each of the multiple second sealing assemblies 71b contacts the second exhaust chamber avoidance surface 66b of the exhaust chamber flange 62. Furthermore, a portion of the radially inner side Dri of the downstream seal plate group 72bd of each of the plurality of second seal assemblies 71b is in contact with the seal receiving surface 49 of the second outer diffuser end portion 47 .

[0194] The second outer mounting member 74b includes a second outer pressing plate 75b that presses the radially outer portion Dro of the second seal assembly 71b against the second exhaust chamber relief surface 66b of the exhaust chamber flange 62, and a second outer mounting bolt 76b that mounts the second outer pressing plate 75b to the exhaust chamber flange 62. The second outer pressing plate 75b contacts the radially outer portion Dro of the second seal assembly 71b and the first exhaust chamber relief surface 66a of the exhaust chamber flange 62. The radially outer portion Dro of the second seal assembly 71b is sandwiched between the second outer pressing plate 75b and the second exhaust chamber relief surface 66b of the exhaust chamber flange 62. The second outer mounting bolt 76b penetrates the portion of the second outer pressing plate 75b that contacts the first exhaust chamber relief surface 66a and the exhaust chamber flange 62 in the axial direction Da. The second outer mounting bolt 76b does not penetrate the second seal assembly 71b in the axial direction Da. Therefore, the radially outer side Dro portion of the second seal assembly 71b sandwiched between the second outer pressing plate 75b and the second exhaust chamber relief surface 66b of the exhaust chamber flange 62 can move in the radial direction Dr. Therefore, the second seal assembly 71b of this embodiment allows thermal expansion in the radial direction Dr.

[0195] The second inner mounting member 77b includes a second inner pressing plate 78b for pressing a radially inner portion Dri of the second seal assembly 71b against the seal receiving surface 49 of the second outer diffuser end portion 47, and a second inner mounting bolt 79b for mounting the second inner pressing plate 78b to the second outer diffuser end portion 47. The second inner mounting bolt 79b penetrates the second inner pressing plate 78b and the radially inner portion Dri of the second seal assembly 71b along the axial direction Da and is screwed into the second outer diffuser end portion 47.

[0196] As described above, in this embodiment, the second outer pressing plate 75b is fixed to the exhaust chamber flange 62 using the second outer mounting bolts 76b that penetrate the portion of the second outer pressing plate 75b that contacts the first exhaust chamber relief surface 66a in the axial direction Da. Furthermore, in this embodiment, the second inner pressing plate 78b and the portion of the second seal assembly 71b on the radially inner side Dri are fixed to the second outer diffuser end portion 47 using the second inner mounting bolts 79b that penetrate the portion of the second inner pressing plate 78b and the portion of the second seal assembly 71b on the radially inner side Dri.

[0197] Therefore, in this embodiment, when installing the second annular seal device 70b, it is necessary to ensure space for the second outer mounting bolts 76b and the second inner mounting bolts 79b to move along the axial direction Da. Therefore, in this embodiment, when installing the second annular seal device 70b at the target position and when removing the second annular seal device 70b from the target position, the exhaust chamber 60 and the exhaust casing 50 are separated to ensure this space.

[0198] like Figures 3 to 5 As shown, the third annular sealing device 80 includes a plurality of third sealing assemblies 81 arranged along the circumferential direction Dc, a plurality of spacers 90 arranged along the circumferential direction Dc, and a plurality of spacer movement inhibitors 95 arranged along the circumferential direction Dc.

[0199] Each of the plurality of third seal assemblies 81 includes a seal plate assembly 82, an outer frame 84 supporting the radially outer edge Dro of the seal plate assembly 82, an inner frame 85 supporting the radially inner edge Dri of the seal plate assembly 82, outer pins 86 for attaching the radially outer portion Dro of the seal plate assembly 82 to the outer frame 84, and inner pins 87 for attaching the radially inner portion Dri of the seal plate assembly 82 to the inner frame 85. The seal plate assembly 82 is a bundle of seal plates 83 formed by overlapping a plurality of seal plates 83 extending in the radial direction Dr and the circumferential direction Dc in the axial direction Da. The outer pins 86 penetrate the radially outer portion Dro of the seal plate assembly 82 and the outer frame 84 and are welded to the outer frame 84. The inner pins 87 penetrate the radially outer portion Dro of the seal plate assembly 82 and the inner frame 85 and are welded to the inner frame 85. The outer frame 84 is connected to the first outer pressure plate 75a from the axial downstream side Dad. In addition, the inner frame 85 is in contact with the first outer diffuser end surface 43 and is joined to the first outer diffuser end surface 43 by welding. Figure 4 As shown, a weld portion 89 exists between the inner frame 85 and the first outer diffuser end surface 43 .

[0200] like Figure 5 As shown, the spacer 90 is positioned between the outer frame 84 of the third seal assembly 81 and the exhaust chamber relief surface 66 of the exhaust chamber flange 62, i.e., between the frame and relief surface S3. This spacer restricts movement of the outer frame 84 along the axial direction Da while allowing movement of the outer frame 84 in the radial direction Dr. Therefore, the third seal assembly 81 of this embodiment allows for thermal expansion in the radial direction Dr. Specifically, the spacer 90 is positioned between the outer frame 84 of the third seal assembly 81 and the second outer pressure plate 75b, which is mounted to the exhaust chamber relief surface 66 of the exhaust chamber flange 62 via the second outer mounting bolts 76b. The spacer 90 includes an outer frame contact surface 91 that contacts the outer frame 84 toward the axial upstream side Dau; a frame-side recess 92 that is recessed from the outer frame contact surface 91 toward the axial downstream side Dad; a press plate contact surface 93 that contacts the second outer press plate 75b toward the axial downstream side Dad; and a press plate-side recess 94 that is recessed from the press plate contact surface 93 toward the axial upstream side Dau. The width in the axial direction Da between the outer frame contact surface 91 and the press plate contact surface 93 of the spacer 90 is substantially the same as the distance in the axial direction Da between the outer frame 84 of the third seal assembly 81 and the second outer press plate 75b. Therefore, the outer frame 84 of the third seal assembly 81 is clamped between the first outer press plate 75a and the spacer 90 located on the axial upstream side of the second outer press plate 75b, thereby restricting movement in the axial direction Da. The bolt heads 76 h of the second outer mounting bolts 76 b for mounting the second outer pressing plate 75 b on the exhaust chamber relief surface 66 of the exhaust chamber flange 62 enter the pressing plate side recesses 94 of the spacer 90 .

[0201] As described above, the second outer pressing plate 75b, serving as the second member, is positioned between the frame and the relief surface S3. This second outer pressing plate 75b is immovably positioned relative to the exhaust chamber 60. The spacer movement inhibitor 95 increases the friction between the second outer pressing plate 75b and the spacer 90, thereby inhibiting movement of the spacer 90 in the radial direction Dr and the axial direction Da. This spacer movement inhibitor 95 includes a spring 96 that generates a spring force in the axial direction Da; a spring support frame 97 that covers the end of the spring 96 on the upstream side Dau and contacts the first outer pressing plate (first member) 75a; and a spring cover 98 that covers the end of the spring 96 on the downstream side Dad and contacts the spacer 90. The spring support frame 97 contacts the first outer pressing plate (first member) 75a from the downstream side Dad. The front end of the spring cover 98 enters the frame-side recess 92 of the spacer 90 and contacts the bottom surface of the frame-side recess 92. Therefore, the spacer 90 is pressed toward the axial downstream side Dad by the spring 96 via the spring cover 98 , thereby increasing the frictional force between the spacer 90 and the second outer pressing plate (second member) 75 b .

[0202] Next, refer to Figures 6 to 8 The procedure for mounting the third annular seal device 80 described above will be described.

[0203] Before installing the third annular sealing device 80, Figure 6 As shown, the exhaust casing flange 52 and the exhaust chamber flange 62 are connected by flange connecting bolts 69. A first annular sealing device 70a is provided from the end portion on the axial downstream side Dad of the first outer diffuser 40 to the end portion on the axial downstream side Dad of the exhaust casing 50. A second annular sealing device 70b is provided from the end portion on the axial upstream side Dau of the second outer diffuser 45 to the end portion on the axial upstream side Dau of the exhaust chamber 60.

[0204] First, the spacer 90 is positioned between the first outer pressing plate 75a and the second outer pressing plate 75b. The spacer 90 is then positioned so that the bolt heads 76h of the second outer mounting bolts 76b, which attach the second outer pressing plate 75b to the exhaust chamber relief surface 66 of the exhaust chamber flange 62, enter the pressing plate-side recesses 94 of the spacer 90. During the placement of the spacer 90, the jig 99a is used to move the spacer 90 from the radially inner side Dri of the first and second outer diffusers 40 and 45, through between the first and second outer diffuser end surfaces 43 and 48, and into between the first and second outer diffuser end surfaces.

[0205] If only the bolt head 76h of the second outer mounting bolt 76b enters the pressing plate side recess 94 of the spacer 90, the spacer 90 is likely to fall. Figure 7As shown in FIG. 1 , a spacer movement suppressor 95 is disposed between the spacer 90 and the first outer pressing plate 75a. Figure 5 As shown, the spacer movement inhibitor 95 is arranged so that the spring support frame 97 of the spacer movement inhibitor 95 contacts the first outer pressing plate 75a, and the front end portion of the spring cover 98 of the spacer movement inhibitor 95 enters the frame-side recess 92 of the spacer 90 and contacts the bottom surface of the frame-side recess 92. During the arrangement of the spacer movement inhibitor 95, the jig 99b is used to move the spacer movement inhibitor 95 from the radially inner side Dri of the first outer diffuser 40 and the second outer diffuser 45, through between the first outer diffuser end surface 43 and the second outer diffuser end surface 48, and then to between the spacer 90 and the first outer pressing plate 75a.

[0206] The arrangement of the spacer movement suppressing member 95 increases the frictional force between the second outer pressing plate 75 b and the spacer 90 , thereby suppressing the movement of the spacer 90 in the radial direction Dr and the axial direction Da.

[0207] Therefore, the spacer 90 can be prevented from falling.

[0208] However, as a method of suppressing the movement of the spacer 90 in the radial direction Dr and the axial direction Da, there is a method of using a bolt that penetrates the spacer 90 in the axial direction Da. If this method is adopted, when the exhaust chamber contact surface 54 of the exhaust chamber flange 52 is in contact with the exhaust chamber contact surface 64 of the exhaust chamber flange 62, the bolt cannot be moved in the axial direction Da between the frame and the avoidance surface S3. Therefore, when this method is adopted, the exhaust chamber 60 needs to be separated from the exhaust chamber 50. However, in this embodiment, instead of using bolts, the friction between the spacer 90 and the second outer pressing plate 75b as a component is increased by the spacer movement suppressor 95, thereby suppressing the movement of the spacer 90 in the radial direction Dr and the axial direction Da. Therefore, even when the exhaust chamber 60 is connected to the exhaust chamber 50, the spacer 90 and the spacer movement suppressor 95 can be arranged.

[0209] Next, if Figure 8 and Figure 3 As shown, the third seal assembly 81 is arranged such that the outer frame 84 of the third seal assembly 81 is located between the first outer pressure plate 75a and the spacer 90, and the inner frame 85 of the third seal assembly 81 is opposed to the first outer diffuser end surface 43. During the arrangement of the third seal assembly 81, the third seal assembly 81 is moved radially outward Dro such that the outer frame 84 of the third seal assembly 81 passes from the radially inner side Dri of the first outer diffuser 40 and the second outer diffuser 45, passes between the first outer diffuser end surface 43 and the second outer diffuser end surface 48, and reaches between the spacer 90 and the first outer pressure plate 75a.

[0210] However, if Figure 9 As shown, when the sealing plate groups 82c of the plurality of third sealing assemblies 81c are arranged along the circumferential direction Dc to form an annular sealing plate group array SR centered on the axis Ar, the circumferential length Dc of the outer edge of the annular sealing plate group array SR is longer than the circumferential length Dc of the inner edge of the annular sealing plate group array SR. Therefore, for all of the sealing plate groups 82c in each of the plurality of third sealing assemblies 81c, the circumferential length Dc of the outer edge of the sealing plate group 82c is longer than the circumferential length Dc of the inner edge of the annular sealing plate group 82c.

[0211] In this case, as described above, even if multiple third seal assemblies 81c are sequentially arranged, the last arranged third seal assembly 81c cannot be moved radially outward Dro to be arranged at the target position. This is because, with respect to the planned arrangement position Pr of the last third seal assembly 81c among the already arranged third seal assemblies 81c, the distance d1 in the circumferential direction Dc between the inner edge of the sealing plate assembly 82c of the third seal assembly 81c arranged on one side in the circumferential direction Dc and the inner edge of the sealing plate assembly 82c of the third seal assembly 81c arranged on the other side in the circumferential direction Dc is smaller than the dimension d2 in the circumferential direction Dc of the outer edge of the sealing plate assembly 82c of the last third seal assembly 81c.

[0212] Therefore, in order to sequentially move the plurality of third seal assemblies 81 radially outward Dro and arrange all of the plurality of third seal assemblies 81 at the target position, the circumferential length Dc of the outer edge of each seal plate 83 of the seal plate group 82 constituting at least a portion of the third seal assemblies 81 must be the same as the circumferential length Dc of the inner edge thereof. In this case, the circumferential length Dc of the outer edge of each seal plate 83 of the seal plate group 82 constituting the third seal assemblies 81 other than at least a portion of the third seal assemblies 81 must be longer than the circumferential length Dc of the inner edge thereof.

[0213] In this embodiment, as described above, Figure 10 As shown, the outer edge circumferential length Dc of each sealing plate 83b of the sealing plate group 82b of the plurality of third sealing assemblies 81b constituting a portion of the plurality of third sealing assemblies 81 is the same as the inner edge circumferential length Dc. Furthermore, the outer edge circumferential length Dc of each sealing plate 83a of the sealing plate group 82a of the plurality of third sealing assemblies 81a constituting the remaining third sealing assemblies 81 is longer than the inner edge circumferential length Dc. Therefore, in this embodiment, all third sealing assemblies 81 can be sequentially moved radially outward Dro, allowing all third sealing assemblies 81 to be positioned at the desired location.

[0214] At the end of the configuration of the third sealing assembly 81, as in the case of using Figure 4 As described above, the inner frame 85 of the third seal assembly 81 is joined to the first outer diffuser end surface 43 by welding.

[0215] As a method of restricting the relative movement of the inner frame 85 of the third seal assembly 81 with respect to the end portion of the first outer diffuser 40 , there is a method of using bolts that penetrate the inner frame 85 in the axial direction Da.

[0216] If this method is used, the bolts cannot be moved along the axial direction Da while the exhaust casing contact surface 54 of the exhaust casing flange 52 is in contact with the exhaust casing contact surface 64 of the exhaust casing flange 62. Therefore, when this method is used, the exhaust casing 60 must be separated from the exhaust casing 50. However, in this embodiment, the inner frame 85 is fixed to the end of the first outer diffuser 40 by welding rather than using bolts. Therefore, even when the exhaust casing 60 and the exhaust casing 50 are connected, the inner frame 85 can be fixed to the end of the first outer diffuser 40.

[0217] With the above, the installation of the third annular sealing device 80 is completed.

[0218] As described above, in this embodiment, the first annular sealing device 70 a can suppress the inflow of the exhaust gas HG into the first outer space S1 , and the second annular sealing device 70 b can suppress the inflow of the exhaust gas HG into the second outer space S2 .

[0219] Furthermore, in this embodiment, the third annular seal 80 can suppress the exhaust gas HG from flowing toward the first annular seal 70a. That is, in this embodiment, both the first annular seal 70a and the third annular seal 80 can suppress the exhaust gas HG from flowing into the first outer space S1.

[0220] If high-temperature exhaust gas HG flows into the first outer space S1 , the cooling effect of the air in the first outer space S1 on the first outer diffuser 40 is significantly reduced, and the first outer diffuser 40 may be thermally damaged.

[0221] In this embodiment, even if the third annular seal 80 is damaged by the heat of the exhaust gas HG, the first annular seal 70a can still suppress the inflow of the exhaust gas HG into the first outer space S1. Therefore, in this embodiment, thermal damage to the first outer diffuser 40 caused by the inflow of high-temperature exhaust gas HG into the first outer space S1 can be suppressed.

[0222] Some gas turbine-equipped plants include an exhaust heat recovery boiler that utilizes the heat of exhaust gas HG discharged from the gas turbine to generate steam. In this case, the present embodiment can suppress a decrease in the amount of exhaust gas HG supplied to the exhaust heat recovery boiler due to leakage of exhaust gas HG from the exhaust flow path HP.

[0223] Furthermore, in this embodiment, the components constituting the third annular seal device 80 can be moved from the radially inner side Dri of the first outer diffuser 40 and the second outer diffuser 45 to the radially outer side Dro between the first outer diffuser end surface 43 and the second outer diffuser end surface 48, thereby positioning the components constituting the third annular seal device 80 at a target position. Therefore, in this embodiment, even when the exhaust chamber 60 and the exhaust casing 50 are connected, the third annular seal device 80 can be installed at the target position and removed from the target position.

[0224] "Modification of the spacer movement suppressor"

[0225] like Figures 11 to 13 As shown, the spacer movement suppressor 100 of this modification also includes a spring 96 , a spring support frame 101 , and a spring cover 105 , similar to the spacer movement suppressor 95 of the above embodiment.

[0226] The spring support frame 101 in this modified example includes a frame body 102 that covers the end portion on the axial upstream side Dau of the spring 96, and a frame flange 103. The frame body 102 has a member contact surface 102p that contacts the outer pressing plate 75a, which is the first member. The frame flange 103 is located closer to the axial downstream side Dad than the member contact surface 102p and protrudes from the frame body 102 in the circumferential direction Dc.

[0227] The spring cover 105 includes a cover body 106 that covers the end portion of the spring 96 on the downstream side Dad of the axis, and a cover flange 107. The cover body 106 has a spacer contact surface 106p that contacts the spacer 90. The cover flange 107 is located farther upstream Dau than the spacer contact surface 106p and protrudes from the cover body 106 in the circumferential direction Dc. The cover flange 107 is spaced apart from the frame flange 103 in the axial direction Da.

[0228] When the spacer movement suppressor 100 of this modified example is arranged between the spacer 90 and the first outer pressing plate 75 a , a jig 110 is used. The jig 110 includes a clamping jig 111 and a pressing rod 115 .

[0229] The clamping jig 111 includes a finger support rod 112, a first finger 113, and a second finger 114 disposed at the distal end of the finger support rod 112. The finger support rod 112 has a hole 112h formed therein, extending along the central axial direction Dac, along which the central axis Ac of the finger support rod 112 extends. The first finger 113 and the second finger 114 extend along either central axial direction Dac. The first finger 113 and the second finger 114 face each other with a gap in the radial direction relative to the central axis Ac. A first tapered surface 113t is formed at the distal end of the first finger 113. This first tapered surface 113t is inclined relative to the central axial direction Dac, gradually moving away from the second finger 114 as it moves away from the finger support rod 112. A second tapered surface 114t is formed at the distal end of the second finger 114. The second tapered surface 114 t is inclined with respect to the central axial direction Dac so as to gradually move away from the first finger 113 as it moves toward a side farther from the finger support rod 112 in the central axial direction Dac.

[0230] The pressing rod 115 is a rod that can be inserted into a hole 112 h formed in the finger support rod 112 of the clamping jig 111 .

[0231] Next, use Figure 14 and Figure 15 The following describes the steps for installing the spacer movement suppressor 100 using the above-described jig 110. First, the spring 96 is positioned between the spring support frame 101 and the spring cover 105, with the spring support frame 101 and the spring cover 105 covering the spring 96. Next, the frame flange 103 of the spring support frame 101 and the cover flange 107 of the spring cover 105 are inserted between the first finger 113 and the second finger 114 of the clamping jig 111, narrowing the gap between the frame flange 103 and the cover flange 107. As a result, the gap between the component contact surface 102p of the spring support frame 101 and the spacer contact surface 106p of the spring cover 105 is narrowed. The clamping jig 111 is then operated to insert the spacer movement suppressor 100, attached to the clamping jig 111, between the spacer 90 and the first outer pressing plate 75a.

[0232] After the spacer movement inhibitor 100 is inserted between the spacer 90 and the first outer pressing plate 75a, as shown in FIG. Figure 16 and Figure 17 As shown, the pressing rod 115 is made to protrude from the hole 112h of the finger support rod 112 toward the radially outer side Dro, while the clamping jig 111 is pulled toward the radially inner side Dri.

[0233] As a result, the spacer movement suppressor 100 is supported by the pressure rod 115, and the position of the spacer movement suppressor 100 in the radial direction Dr remains unchanged, while the frame flange 103 and the cover flange 107 are separated from between the first finger 113 and the second finger 114 of the clamp 111. Consequently, the spring 96 of the spacer movement suppressor 100 increases the gap between the frame flange 103 and the cover flange 107, as well as the gap between the component contact surface 102p of the spring support frame 101 and the spacer contact surface 106p of the spring cover 105. Furthermore, the component contact surface 102p of the spring support frame 101 is in close contact with the outer pressing plate 75a, and the spacer contact surface 106p of the spring cover 105 is in close contact with the spacer 90.

[0234] As described above, the installation of the spacer movement suppressing member 100 is completed.

[0235] Next, using the above clamp 110, use Figure 14 and Figure 15 The procedure for removing the spacer movement suppressor 100 is described below. A clamping jig 111 is installed on the spacer movement suppressor 100, located between the spacer 90 and the first outer pressing plate 75a. At this point, the clamping jig 111 is moved radially outward Dro so that the first and second fingers 113, 114 of the clamping jig 111 reach between the spacer 90 and the first outer pressing plate 75a. During this operation, the frame flange 103 contacts the first tapered surface 113t of the first finger 113, and the cover flange 107 contacts the second tapered surface 114t of the second finger 114. As the clamping jig 111 is further moved radially outward Dro, the frame flange 103, which is in contact with the first tapered surface 113t of the first finger 113, is pressed by the first tapered surface 113t and gradually moves toward the cover flange 107 (the axial downstream side Dad). Furthermore, the cover flange 107, which is in contact with the second tapered surface 114t of the second finger 114, is pressed by the second tapered surface 114t and gradually moves toward the spring support frame 101 (the axial upstream side Dau). Specifically, the gap between the frame flange 103 and the cover flange 107, as well as the gap between the component contact surface 102p of the spring support frame 101 and the spacer contact surface 106p of the spring cover 105, gradually decreases.

[0236] When the frame flange 103 of the spring support frame 101 and the cover flange 107 of the spring cover 105 are completely inserted between the first finger 113 and the second finger 114 of the clamping jig 111, the spacer contact surface 106p of the cover flange 107 is completely separated from the spacer 90. Then, the finger support rod 112 is operated to pull the spacer movement suppressor 100 attached to the clamping jig 111 out from between the spacer 90 and the first outer pressing plate 75a toward the radially inner side Dri.

[0237] With the above, the removal of the spacer movement suppressing member 100 is completed.

[0238] As described above, by using the spacer movement suppressing tool 100 and the jig 110 according to this modification, the spacer movement suppressing tool 100 can be easily arranged and removed.

[0239] "Other modifications"

[0240] In the above embodiment, after the spacer 90 is disposed between the first outer pressing plate 75a and the second outer pressing plate 75b, the outer frame 84 of the third sealing assembly 81 is positioned between the spacer 90 and the first outer pressing plate 75a. During this period, until the inner frame 85 of the third sealing assembly 81 is welded to the first outer diffuser end portion 42, the spacer movement inhibitors 95 and 100 are used to inhibit movement of the spacer 90. However, during this period, if careful work is performed to prevent the spacer 90 from moving, or if a jig is used to restrain the spacer 90 during this period, the spacer movement inhibitor 95 may not be used.

[0241] In addition, in the above embodiment, the third annular sealing device 80 is provided at the end portion of the first outer diffuser 40 on the axial downstream side Dad so as to suppress the exhaust gas HG from flowing toward the first annular sealing device 70a. However, the third annular sealing device 80 may also be provided at the end portion of the second outer diffuser 45 on the axial upstream side Dau so as to suppress the flow of the exhaust gas HG toward the second annular sealing device 70b. In this case, the two sealing devices, the second annular sealing device 70b and the third annular sealing device 80, can suppress the flow of the exhaust gas HG into the second outer space S2. Therefore, in this case, thermal damage to the second outer diffuser 45 caused by the flow of high-temperature exhaust gas HG into the second outer space S2 can be suppressed.

[0242] The present disclosure is not limited to the embodiment and modifications described above, and various additions, changes, substitutions, and partial deletions are possible without departing from the conceptual idea and gist of the present invention as defined in the claims and their equivalents.

[0243] Postscript

[0244] The exhaust equipment in the above-mentioned embodiment and modified examples can be understood as follows.

[0245] (1) The exhaust equipment of the first option has:

[0246] The first outer diffuser 40 is cylindrical with the axis Ar as the center, and defines the edge of the radially outer side Dro of the upstream side portion of the exhaust flow path HP through which the exhaust gas HG rotated by the turbine rotor 21 passes; the second outer diffuser 45 is arranged with an interval between the axial upstream side Dau and the axial downstream side Dad in the axial direction Da extending from the axis Ar relative to the first outer diffuser 40, and is cylindrical with the axis Ar as the center, and defines the edge of the radially outer side Dro of the upstream side portion of the exhaust flow path HP through which the exhaust gas HG passed after passing through the first outer diffuser 40 passes. The exhaust casing 50 includes an exhaust casing body 51 having a cylindrical shape centered on the axis Ar and radially outwardly extending from an end portion of the exhaust casing body 51 on the downstream side of the exhaust flow path HP and covering the outer periphery of the first outer diffuser 40; an exhaust chamber 60 having a cylindrical shape centered on the axis Ar and covering the outer side of the second outer diffuser 45; a first annular sealing device 70a having an annular shape centered on the axis Ar; a second annular sealing device 70b having an annular shape centered on the axis Ar; and a third annular sealing device 80 having an annular shape centered on the axis Ar. The exhaust casing 50 includes an exhaust casing body 51 having a cylindrical shape centered on the axis Ar and an exhaust casing flange 52 extending from an end portion of the exhaust casing body 51 on the downstream side of the axis Dad to a radially outward direction Dro relative to the axis Ar. The exhaust chamber 60 includes an exhaust chamber body 61 having a cylindrical shape centered on the axis Ar, and an exhaust chamber flange 62 that expands from an end portion of the exhaust chamber body 61 on the axial upstream side Dau toward the radially outward side Dro and is connected to the exhaust casing flange 52. The first annular seal 70a is provided on the first outer diffuser 40 to inhibit the exhaust gas HG from flowing into the first outer space S1 between the first outer diffuser 40 and the exhaust casing body 51. The second annular seal 70b is provided on the second outer diffuser 45 to inhibit the exhaust gas HG from flowing into the second outer space S2 between the second outer diffuser 45 and the exhaust chamber body 61. The third annular seal 80 is disposed between the first annular seal 70a and the second annular seal 70b in the axial direction Da. The third annular sealing device 80 is arranged at the end of the axial downstream side Dad of the first outer diffuser 40 in a manner that can suppress the flow of the exhaust gas HG toward the side of the first annular sealing device 70a, or is arranged at the end of the axial upstream side Dau of the second outer diffuser 45 in a manner that can suppress the flow of the exhaust gas HG toward the side of the second annular sealing device 70b.

[0247] In this embodiment, the first annular sealing device 70 a can suppress the inflow of the exhaust gas HG into the first outer space S1 , and the second annular sealing device 70 b can suppress the inflow of the exhaust gas HG into the second outer space S2 .

[0248] Furthermore, in this embodiment, the third annular seal 80 can suppress the flow of exhaust gas HG toward the first annular seal 70a or the flow of exhaust gas HG toward the second annular seal 70b. That is, in this embodiment, the first annular seal 70a and the third annular seal 80 can suppress the flow of exhaust gas HG into the first outer space S1, while the second annular seal 70b and the third annular seal 80 can suppress the flow of exhaust gas HG into the second outer space S2.

[0249] If high-temperature exhaust gas HG flows into the first outer space S1 , the cooling effect of the air in the first outer space S1 on the first outer diffuser 40 is significantly reduced, and the first outer diffuser 40 may be thermally damaged.

[0250] In this embodiment, even if the third annular seal 80 is damaged by the heat of the exhaust gas HG, the first annular seal 70a can still prevent the exhaust gas HG from flowing into the first outer space S1. Therefore, in this embodiment, thermal damage to the first outer diffuser 40 caused by the flow of high-temperature exhaust gas HG into the first outer space S1 can be suppressed. Alternatively, in this embodiment, thermal damage to the second outer diffuser 45 caused by the flow of high-temperature exhaust gas HG into the second outer space S2 can be suppressed for similar reasons.

[0251] Some gas turbine-equipped plants include an exhaust heat recovery boiler that utilizes the heat of exhaust gas HG discharged from the gas turbine to generate steam. In this case, the present embodiment can suppress a decrease in the amount of exhaust gas HG supplied to the exhaust heat recovery boiler due to leakage of exhaust gas HG from the exhaust flow path HP.

[0252] (2) The exhaust device of the second embodiment is based on the exhaust device 30 of the first embodiment, and the third annular sealing device 80 includes a plurality of third sealing assemblies 81 arranged in the circumferential direction Dc relative to the axis Ar. Each of the plurality of third sealing assemblies 81 includes: a sealing plate 83 extending in the radial direction Dr relative to the axis Ar and in the circumferential direction Dc; an inner frame 85 supporting an edge of the sealing plate 83 on the radially inner side Dri relative to the axis Ar; and an outer frame 84 supporting an edge of the sealing plate 83 on the radially outer side Dro.

[0253] (3) The exhaust device of the third embodiment is based on the exhaust device 30 of the second embodiment, wherein the third annular seal 80 is provided at the end portion on the axial upstream side Dau of the second outer diffuser 45 so as to suppress the flow of the exhaust gas HG toward the second annular seal 70b. The exhaust casing flange 52 includes a connection portion 53 having an exhaust casing contact surface 54 that contacts the exhaust casing flange 62, and a relief portion 55 having an exhaust casing relief surface 56 located radially inward Dri of the exhaust casing contact surface 54 and closer to the axial upstream side Dau. The exhaust casing flange 62 includes a connection portion 63 having an exhaust casing contact surface 64 that contacts the exhaust casing contact surface 54, and a relief portion 65 having an exhaust casing relief surface 66 located radially inward Dri and closer to the axial downstream side Dad of the exhaust casing contact surface 64 and facing the exhaust casing relief surface 56 at a distance in the axial direction Da. The outer frame 84 of each of the plurality of third sealing assemblies 81 is disposed between the exhaust casing relief surface 56 and the exhaust chamber relief surface 66 so as to be movable in the radial direction Dr.

[0254] In this embodiment, thermal expansion of the third sealing assembly 81 in the radial direction Dr can be allowed.

[0255] (4) The exhaust device of the fourth scheme is based on the exhaust device 30 of the third scheme, and the third annular sealing device 80 has a spacer 90. The spacer 90 is arranged between the outer frame 84 of each of the multiple third sealing components 81 and the exhaust chamber avoidance surface 66, that is, between the frame and the avoidance surface S3, to limit the movement of the outer frame 84 of each of the multiple third sealing components 81 along the axial direction Da, and on the other hand, allow the outer frame 84 to move in the radial direction Dr.

[0256] In this embodiment, the movement of the outer frame 84 in the radial direction Dr is allowed, and the movement of the outer frame 84 in the axial direction Da is restricted.

[0257] (5) The exhaust device of the fifth embodiment is the exhaust device 30 of the fourth embodiment, wherein the second annular sealing device 70b includes a second member 75b, which is disposed between the frame and the avoidance surface S3 and is configured to be immovable relative to the exhaust chamber 60. The third annular sealing device 80 includes spacer movement inhibitors 95 and 100, which increase the friction between the spacer 90 and the second member 75b to inhibit movement of the spacer 90 in the radial direction Dr and the axial direction Da.

[0258] In this embodiment, the spacer movement suppressing members 95 and 100 can suppress the movement of the spacer 90 in the radial direction Dr and the axial direction Da, and thus the movement of the spacer 90 can be suppressed from the frame-avoidance surface S3.

[0259] However, as a method of suppressing the movement of the spacer 90 in the radial direction Dr and the axial direction Da, there is a method of using a bolt that penetrates the spacer 90 in the axial direction Da. If this method is adopted, when the exhaust casing contact surface 54 of the exhaust casing flange 52 is in contact with the exhaust chamber contact surface 64 of the exhaust chamber flange 62, the bolt cannot be moved in the axial direction Da between the frame and the avoidance surface S3. Therefore, when this method is adopted, the exhaust chamber 60 needs to be separated from the exhaust casing 50. However, in this solution, bolts are not used, and the friction between the spacer 90 and the component is increased by the spacer movement suppressing members 95 and 100 to suppress the movement of the spacer 90 in the radial direction Dr and the axial direction Da. Therefore, even when the exhaust casing 50 is connected to the exhaust chamber 60, the spacer 90 and the spacer movement suppressing members 95 and 100 can be arranged.

[0260] (6) The exhaust device of the sixth aspect is the exhaust device 30 of the fifth aspect, wherein the first annular sealing device 70a includes a first member 75a that is opposed to the spacer 90 at a distance in the axial direction Da and is arranged to be immovable relative to the exhaust casing 50. The spacer movement suppressor 95, 100 includes a spring 96 that generates a spring force in the axial direction Da; a spring support frame 97, 101 that covers an end portion of the spring 96 on one side Dau in the axial direction Da and contacts the first member 75a; and a spring cover 98, 105 that covers an end portion of the spring 96 on the other side Dad in the axial direction Da and contacts the spacer 90.

[0261] (7) The exhaust device of the seventh embodiment is based on the exhaust device 30 of the sixth embodiment, wherein the spring support frame 101 includes: a frame body 102 that covers the end portion of the spring 96 on the one side Dau in the axial direction Da; and a frame flange 103. The frame body 102 has a member contact surface 102p that contacts the first member 75a. The frame flange 103 is located closer to the other side Dad in the axial direction Da than the member contact surface 102p and protrudes from the frame body 102 in the circumferential direction Dc. The spring cover 105 includes a cover body 106 that covers the end portion of the spring 96 on the other side Dad in the axial direction Da and a cover flange 107. The cover body 106 has a spacer contact surface 106p that contacts the spacer 90. The cover flange 107 is located closer to the one side Dau in the axial direction Da than the spacer contact surface 106p and protrudes from the cover body 106 in the circumferential direction Dc. The cover flange 107 faces the frame flange 103 with a gap therebetween in the axial direction Da.

[0262] In this embodiment, the jig 110 is used to reduce the gap between the frame flange 103 and the cover flange 107, and reduce the gap between the component contact surface 102p of the spring support frame 101 and the spacer contact surface 106p of the spring cover 105, thereby facilitating the installation and removal of the spacer movement inhibitor 100.

[0263] (8) The exhaust device according to the eighth aspect is the exhaust device 30 according to the sixth or seventh aspect, wherein the spacer 90 is provided with a recess 92 that is recessed in the axial direction Da and into which a portion of the spring covers 98 and 105 enters.

[0264] In this embodiment, since a portion of the spring covers 98 and 105 of the spacer movement suppressors 95 and 100 enters the recess 92 of the spacer 90 , relative movement of the spacer 90 in the radial direction Dr and the circumferential direction Dc with respect to the spacer movement suppressors 95 and 100 can be suppressed.

[0265] (9) The exhaust device of the ninth embodiment is the exhaust device 30 of any one of the third to eighth embodiments, wherein the inner frame 85 of each of the plurality of third sealing assemblies 81 is fixed to the end portion of the first outer diffuser 40 on the axial downstream side Dad by welding.

[0266] As a method of restricting the relative movement of the inner frame 85 of the third seal assembly 81 with respect to the end portion of the first outer diffuser 40 , there is a method of using bolts that penetrate the inner frame 85 in the axial direction Da.

[0267] If this method is used, the bolts cannot be moved along the axial direction Da while the exhaust casing contact surface 54 of the exhaust casing flange 52 is in contact with the exhaust casing contact surface 64 of the exhaust casing flange 62. Therefore, using this method requires separating the exhaust casing 60 from the exhaust casing 50. However, in this embodiment, the inner frame 85 is fixed to the end of the first outer diffuser 40 by welding, rather than using bolts. Therefore, even when the exhaust casing 60 is connected to the exhaust casing 50, the inner frame 85 can be fixed to the end of the first outer diffuser 40.

[0268] (10) The exhaust device of the tenth embodiment is the exhaust device 30 of any one of the second to ninth embodiments, wherein, for the sealing plate 83b of at least one of the plurality of third sealing assemblies 81, the length of the circumferential direction Dc of the edge of the radially outer side Dro is the same as the length of the circumferential direction Dc of the edge of the radially inner side Dri. For the sealing plates 83a of the third sealing assemblies 81 other than the at least one third sealing assemblies 81 among the plurality of third sealing assemblies 81, the length of the circumferential direction Dc of the edge of the radially outer side Dro is longer than the length of the circumferential direction Dc of the edge of the radially inner side Dri.

[0269] In this embodiment, even when the exhaust chamber 60 is connected to the exhaust casing 50, all the third sealing assemblies 81 can be moved from the radially inner side Dri to the radially outer side Dro of the first outer diffuser 40 and the second outer diffuser 45 and arranged at the target position.

[0270] The gas turbines according to the above-mentioned embodiment and modified examples can be understood as follows, for example.

[0271] (11) The gas turbine of the eleventh option shall have:

[0272] The exhaust equipment 30 of any one of the first to tenth embodiments includes a compressor 10 capable of compressing air to generate compressed air; a combustor 2 capable of burning fuel in the compressed air to generate combustion gas; and a turbine 20 capable of being driven by the combustion gas from the combustor 2. The turbine 20 includes a turbine rotor 21 capable of rotating about the axis Ar; and a turbine casing 25 covering the outer circumference of the turbine rotor 21. The turbine rotor 21 includes a rotor shaft 22 capable of extending in the axial direction Da about the axis Ar; and a plurality of blade cascades 23 arranged at intervals along the axial direction Da and attached to the rotor shaft 22. The turbine casing 25 covers the outer circumference of the portion of the turbine rotor 21 where the plurality of blade cascades 23 are located. The exhaust casing 50 of the exhaust equipment 30 is connected to the end of the turbine casing 25 on the downstream side Dad of the axial direction.

Claims

1. An exhaust device, wherein: The exhaust equipment includes: a first outer diffuser having a cylindrical shape centered on the axis and defining a radially outer edge of an upstream portion of an exhaust flow path through which exhaust gas, after rotating the turbine rotor, passes; a second outer diffuser disposed spaced apart from the first outer diffuser on the downstream side of the axial upstream side and the axial downstream side in the axial direction in which the axis extends, the second outer diffuser being cylindrical with the axis as the center and defining a radially outer edge of a downstream side portion of the exhaust flow path through which the exhaust gas passing through the first outer diffuser passes; an exhaust casing having a cylindrical shape centered on the axis and covering an outer peripheral side of the first outer diffuser; an exhaust chamber having a cylindrical shape centered on the axis and covering an outer side of the second outer diffuser; a first annular sealing device, which is annular with the axis as the center; a second annular sealing device, which is annular with the axis as the center; and The third annular sealing device is annular with the axis as the center. The exhaust casing comprises: an exhaust casing body having a cylindrical shape with the axis as the center; and an exhaust casing flange extending from an end portion of the exhaust casing body on the downstream side of the axis toward the radially outer side relative to the axis. The exhaust chamber comprises: an exhaust chamber body having a cylindrical shape with the axis as the center; and an exhaust chamber flange extending from an end portion of the exhaust chamber body on the upstream side of the axis toward the radially outer side and connected to the exhaust chamber flange. The first annular sealing device is provided on the first outer diffuser so as to suppress the exhaust gas from flowing into the first outer space between the first outer diffuser and the exhaust casing main body. The second annular sealing device is provided on the second outer diffuser so as to suppress the exhaust gas from flowing into the second outer space between the second outer diffuser and the exhaust chamber main body. The third annular sealing device is arranged between the first annular sealing device and the second annular sealing device in the axial direction. The third annular sealing device is provided at the end portion on the downstream side of the axis of the first outer diffuser in a manner capable of suppressing the flow of the exhaust gas toward the side of the first annular sealing device, or the third annular sealing device is provided at the end portion on the upstream side of the axis of the second outer diffuser in a manner capable of suppressing the flow of the exhaust gas toward the side of the second annular sealing device.

2. The exhaust device according to claim 1, wherein The third annular sealing device has a plurality of third sealing components arranged in a circumferential direction relative to the axis. Each of the plurality of third sealing assemblies comprises: a sealing plate extending in the radial direction and the circumferential direction relative to the axis; an inner frame supporting the radial inner edge of the sealing plate relative to the axis; and an outer frame supporting the radial outer edge of the sealing plate.

3. The exhaust device according to claim 2, wherein: The third annular sealing device is provided at the end portion of the second outer diffuser on the downstream side of the axis so as to suppress the exhaust gas from flowing toward the second annular sealing device. The exhaust chamber flange includes: a connecting portion having an exhaust chamber contact surface in contact with the exhaust chamber flange; and a relief portion having an exhaust chamber relief surface located radially inward and axially upstream of the exhaust chamber contact surface. The exhaust chamber flange includes: a connecting portion having an exhaust chamber contact surface in contact with the exhaust chamber contact surface; and an escape portion having an exhaust chamber escape surface located radially inward and axially downstream of the exhaust chamber contact surface and opposed to the exhaust chamber escape surface at a distance in the axial direction. The outer frame of each of the plurality of third sealing assemblies is disposed between the exhaust chamber escape surface and the exhaust chamber escape surface so as to be movable in the radial direction.

4. The exhaust device according to claim 3, wherein: The third annular sealing device has a spacer, which is arranged between the outer frame of each of the multiple third sealing components and the exhaust chamber avoidance surface, that is, between the frame-avoidance surface, to limit the movement of the outer frame of each of the multiple third sealing components in the axial direction, and on the other hand, allow the outer frame to move in the radial direction.

5. The exhaust device according to claim 4, wherein: The second annular sealing device has a second member, which is arranged between the frame and the avoidance surface and is set to be unable to move relative to the exhaust chamber. The third annular seal device includes a spacer movement suppressor that increases friction between the spacer and the second member to suppress movement of the spacer in the radial direction and the axial direction.

6. The exhaust device according to claim 5, wherein: The first annular sealing device includes a first member that is opposed to the spacer at a distance in the axial direction and is arranged to be immovable relative to the exhaust casing. The spacer movement inhibitor includes: a spring that generates elastic force in the axial direction; a spring support frame that covers the end of the spring on one side (axial upstream side) in the axial direction and contacts the first member; and a spring cover that covers the end of the spring on the other side in the axial direction and contacts the spacer.

7. The exhaust device according to claim 6, wherein: The spring support frame includes: a frame body covering the end portion on the one side in the axial direction of the spring; and a frame flange. The frame body has a member contact surface that contacts the first member. The frame flange is located on the other side of the member contact surface in the axial direction and protrudes from the frame body in the circumferential direction. The spring cover includes: a cover body covering the other end portion of the spring in the axial direction; and a cover flange. The cover body has a spacer contact surface that contacts the spacer. The cover flange is located on the one side in the axial direction relative to the spacer contact surface and protrudes from the cover body in the circumferential direction. The cover flange faces the frame flange with a gap therebetween in the axial direction.

8. The exhaust device according to claim 6, wherein: The spacer is formed with a recessed portion that is recessed along the axial direction and into which a portion of the spring cover enters.

9. The exhaust device according to any one of claims 3 to 8, wherein: The inner frame of each of the plurality of third sealing assemblies is fixed to an end portion on the downstream side of the axis of the first outer diffuser by welding.

10. The exhaust device according to any one of claims 2 to 8, wherein: For the sealing plate of at least one third sealing assembly among the plurality of third sealing assemblies, the circumferential length of the radially outer edge is the same as the circumferential length of the radially inner edge. For the sealing plates of the other third sealing assemblies except the at least one third sealing assembly among the plurality of third sealing assemblies, the circumferential length of the radially outer edge is longer than the circumferential length of the radially inner edge.

11. A gas turbine, wherein: The gas turbine comprises: The exhaust device according to any one of claims 1 to 8; a compressor capable of compressing air to generate compressed air; a burner capable of burning fuel in the compressed air to generate combustion gas; as well as a turbine capable of being driven by said combustion gases from said combustor, The turbine includes: a turbine rotor rotatable about the axis; and a turbine chamber covering the outer circumference of the turbine rotor. The turbine rotor includes: a rotor shaft extending in the axial direction with the axis as the center; and a plurality of rotor blades arranged in the axial direction at intervals and mounted on the rotor shaft. The turbine chamber covers the outer periphery of a portion of the turbine rotor where the plurality of moving blade cascades are located. The exhaust casing of the exhaust equipment is connected to an end portion of the turbine casing on the downstream side of the axis.

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