High-temperature heat preservation structure of gas turbine exhaust passage

Abstract

The high-temperature heat preservation structure comprises an outer shell of the gas turbine exhaust passage, a heat preservation layer, a heat insulation layer and a lining plate are sequentially laid on the inner side of the outer shell, a fixed supporting connecting piece is fixedly arranged on the inner side of the outer shell and penetrates through the heat preservation layer, and a lining supporting piece is fixedly arranged on the inner side of the lining plate. The lining supporting piece penetrates through the heat insulation layer and is fixedly connected with the supporting connecting piece through a fastening piece. A penetrating hole is formed in the position, corresponding to the lining supporting piece, of the lining plate, and a hole cover plate is connected to the penetrating hole in a sealed mode. According to the structure, no supporting stud or other redundant structural parts penetrate through the inner lining plate to be directly exposed in the high-temperature air channel, direct transfer and loss of heat can be reduced, a better heat preservation effect is achieved, the inner side of the channel is smooth and flat, airflow channel resistance is smaller, a flow field is smoother, and the heat preservation effect is better. And passing of high-speed and high-temperature gas is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas turbine exhaust device, concretely relates to a high temperature heat preservation structure of gas turbine exhaust passage. BACKGROUND

[0002] As an important auxiliary equipment of gas turbine (or gas internal combustion engine), the exhaust system maintains the exhaust pressure to ensure the efficiency of the gas turbine; the exhaust passage is sealed and guides the exhaust direction, expands and depressurizes the high-temperature spiral tail gas and guides the flow to be a certain regular turbulent gas, the gas flow field is smooth, and the pressure loss is low; the heat preservation and insulation make the contact part with the environment safe, reduce the energy loss, and ensure the effective waste heat utilization of the rear end; the emission height and flow rate of the flue gas are controlled to facilitate the diffusion and dilution of the flue gas, so that the gas turbine emission meets the environmental protection requirements.

[0003] Generally, the pipe wall of the exhaust passage includes an outer shell, an inner lining plate, and a heat preservation body sandwiched between the outer shell and the inner lining plate, a bolt for limiting the transition movement of the heat preservation body is usually fixed at one end with the outer shell, penetrates the heat preservation body and the inner lining plate at the other end, and connects a pad plate and a nut on the bolt head outside the inner lining plate, as disclosed in a gas turbine exhaust diffusion section heat preservation process of Chinese invention patent application CN106150644A: a plurality of saddles and bolts are welded on the inner side wall of the gas turbine, the heat preservation body is laid on the inner side wall of the gas turbine, the heat preservation body is clamped by the saddles, and the bolts penetrate the heat preservation body; lubricating oil is applied on the end of the bolt, and a pad plate is sleeved, and then a nut is installed and fixed on the bolt. The above structure has the following problems: one end of the metal bolt is directly exposed in the high-temperature gas flow channel, and the other end is fixed with the outer shell, on the one hand, the metal bolt as the main heat transfer path has high heat loss, which may cause the average temperature of the overall outer shell to be too high, and many high-temperature "hot spots" are formed on the surface of the outer shell, which has safety hazards; on the other hand, the exposed end of the metal bolt is seriously hot corroded, has high requirements for the thermal creep of the material, and has a certain influence on the flow of the gas flow. UTILITY MODEL CONTENTS

[0004] To solve the above problems in the prior art, the utility model provides a high-temperature heat preservation structure of a gas turbine exhaust passage, which has better heat preservation effect and longer service life.

[0005] To achieve the above technical purposes, the utility model adopts the technical scheme of:

[0006] The utility model provides a high temperature heat preservation structure of gas turbine exhaust passage, including the outer casing of exhaust passage, the inside of outer casing is sequentially laid with heat preservation layer, heat insulation layer, inner lining plate, and the inside of outer casing is fixedly provided with fixed support connecting piece, and fixed support connecting piece penetrates heat preservation layer, and the inside of inner lining plate is fixedly provided with inner lining support piece, and inner lining support piece penetrates heat insulation layer, and inner lining support piece is connected fixed support connecting piece through fastener, the position of inner lining support piece is set with the perforation of inner lining plate, and the perforation is sealingly connected with hole cover plate.

[0007] As a preferred technical scheme, the heat preservation layer is made of rock wool, and the heat insulation layer is made of ceramic cotton.

[0008] As a preferred technical scheme, a gasket is arranged between the inner lining support piece and the fixed support connecting piece and between the inner lining support piece and the fastener, and the gasket is a high-temperature-resistant and heat-insulating gasket.

[0009] As a preferred technical scheme, the inner lining support piece includes a connecting plate and at least one support plate, the connecting plate is provided with a through hole, the support plate is arranged at one end of the connecting plate, and the support plate is inclined away from the axis of the through hole of the connecting plate, one end of the support plate away from the connecting plate is welded and fixed to the inner lining plate, and the inner lining support piece is integrally formed by bending a sheet metal piece.

[0010] As a preferred technical scheme, one support plate is arranged, and the inner lining support piece is in an L shape.

[0011] As a preferred technical scheme, two support plates are arranged, the two support plates are arranged on opposite sides of the connecting plate, and the inner lining support piece is in a U shape; or four support plates are arranged, the four support plates are arranged circumferentially around the connecting plate, and the inner lining support piece is in a mouth shape.

[0012] As a preferred technical scheme, the fixed support connecting piece includes a support column, an outer thread is arranged in an upper portion of the support column, a first nut is fixedly connected to the upper portion of the support column, a lower support plate is fixedly connected to an upper portion of the first nut, the inner lining support piece is arranged on the lower support plate through the support column, the fastener is a nut, and the nut is adapted to the outer thread of the upper portion of the support column.

[0013] As another preferred technical scheme, the fixed support connecting piece includes a support scallop plate, a lower support plate is fixedly arranged on a top portion of the support scallop plate, a stud is fixedly arranged on the lower support plate, the inner lining support piece is arranged on the lower support plate through the stud, the fastener is a nut, and the nut is adapted to the stud.

[0014] As a preferred technical scheme, the support scallop plate is in a square or trapezoidal plate shape, and a second notch is arranged on a side of the support scallop plate in contact with the outer casing.

[0015] As a preferred technical scheme, the support fan-shaped plate is provided with a bending reinforcing edge.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] The high-temperature heat preservation structure of the gas turbine exhaust passage has the following advantages: the connecting positions of the lining support member and the fixed support connecting member are arranged at the joint of the heat preservation layer and the heat insulation layer, no support stud or other redundant structural member penetrates the lining plate to be directly exposed in the high-temperature gas passage, the direct heat transfer and loss are reduced, better heat preservation effect is achieved, the temperature of the outer shell body is relatively balanced, the safety hidden danger factors around the equipment are reduced, good heat insulation effect is achieved, the inner side of the passage is smooth and flat, the airflow passage resistance is smaller, the flow field is smoother, and the high-speed high-temperature gas is more conducive to passing through.

[0018] The high-temperature heat preservation structure of the gas turbine exhaust passage has the following advantages: the connecting positions of the lining support member and the fixed support connecting member are arranged at the joint of the heat preservation layer and the heat insulation layer, no support stud or other redundant structural member penetrates the lining plate to be directly exposed in the high-temperature gas passage, the direct heat transfer and loss are reduced, better heat preservation effect is achieved, the temperature of the outer shell body is relatively balanced, the safety hidden danger factors around the equipment are reduced, good heat insulation effect is achieved, the inner side of the passage is smooth and flat, the airflow passage resistance is smaller, the flow field is smoother, and the high-speed high-temperature gas is more conducive to passing through.

[0019] The high-temperature heat preservation structure of the gas turbine exhaust passage has the following advantages: the connecting positions of the lining support member and the fixed support connecting member are arranged at the joint of the heat preservation layer and the heat insulation layer, no support stud or other redundant structural member penetrates the lining plate to be directly exposed in the high-temperature gas passage, the direct heat transfer and loss are reduced, better heat preservation effect is achieved, the temperature of the outer shell body is relatively balanced, the safety hidden danger factors around the equipment are reduced, good heat insulation effect is achieved, the inner side of the passage is smooth and flat, the airflow passage resistance is smaller, the flow field is smoother, and the high-speed high-temperature gas is more conducive to passing through. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0021] Figure 1 is a structural schematic view of one embodiment of the utility model;

[0022] Figure 2 is a partial enlarged view of Figure 1 ;

[0023] Figure 3 is a three-dimensional schematic view of the embodiment shown in Figure 1 ;

[0024] Figure 4 is a structural schematic view of another embodiment of the utility model;

[0025] Figure 5 is a partial enlarged view of Figure 4 ;

[0026] Figure 6 is Figure 4 is a sectional view schematic diagram at A-A in the figure;

[0027] Figure 7 is a structure schematic diagram of the inner lining support in the utility model;

[0028] Figure 8 is a structure schematic diagram of the support fan shell board in the utility model.

[0029] Fig. 1 is an outer shell, 2 is a heat preservation layer, 3 is a heat insulation layer, 4 is an inner lining board, 5 is a fixed support connecting piece, 51 is a support stud, 52 is a first nut, 53 is a lower support plate, 54 is a support fan shell board, 541 is a second notch, 542 is a third notch, 543 is a bending reinforcing edge, 55 is a stud, 6 is an inner lining connecting plate, 61 is a connecting plate, 62 is a support plate, 63 is a first notch, 7 is a fastener, 8 is a hole cover plate, 9 is a backing plate. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0031] A high-temperature heat preservation structure of a gas turbine exhaust passage, as shown in Figures 1-6 Fig. 1 is an outer shell, 2 is a heat preservation layer, 3 is a heat insulation layer, 4 is an inner lining board, 5 is a fixed support connecting piece, 51 is a support stud, 52 is a first nut, 53 is a lower support plate, 54 is a support fan shell board, 541 is a second notch, 542 is a third notch, 543 is a bending reinforcing edge, 55 is a stud, 6 is an inner lining connecting plate, 61 is a connecting plate, 62 is a support plate, 63 is a first notch, 7 is a fastener, 8 is a hole cover plate, 9 is a backing plate.

[0032] Preferably, the fixed support connector 5 is welded to the outer shell 1, and the inner lining support 6 is welded to the inner lining plate 4. Further, a pad 9 is provided between the inner lining support 6 and the fixed support connector 5, and between the inner lining support 6 and the fastener 7; the pad 9 is a high-temperature resistant heat-insulating pad. The insulation layer 2 is made of rock wool, and the heat insulation layer 3 is made of ceramic wool.

[0033] Furthermore, the inner lining support 6 as... Figure 7 As shown, the device includes a connecting plate 61 and at least one support plate 62. The connecting plate 61 has a through hole. The support plate 62 is located at one end of the connecting plate 61 and is inclined away from the axis of the through hole in the connecting plate 61. The end of the support plate 62 away from the connecting plate 61 is welded and fixed to the inner lining plate 4. Only one support plate 62 can be provided, in which case the inner lining support 6 is "L"-shaped; two support plates 62 can be provided, with the two support plates 62 located on opposite sides of the connecting plate 61, and the inner lining support 6 is "U"-shaped; four support plates 62 can also be provided, with the four support plates 62 arranged circumferentially around the connecting plate 61, and the inner lining support 6 is "U"-shaped. Preferably, the inner lining support 6 is integrally formed by bending sheet metal. Further, to reduce the weight of the inner lining support 6 and the weld length, a first notch 63 is provided on the side of the support plate 62 that contacts the inner lining plate 4.

[0034] In one specific embodiment, the fixed support connector 5 includes a support column 51 with an external thread at its upper part. A first nut 52 is fixedly connected to the upper part of the support column 51, and a lower support plate 53 is fixedly connected to the upper part of the first nut 52. The connecting plate 61 of the inner lining support 6 passes through the support column 51 and is placed on the lower support plate 53. Preferably, the first nut 52 is spot-welded to the support column 51, and the lower support plate 53 is welded to the support column 51. The fastener 7 is a nut that is compatible with the external nut at the upper part of the support column 51; after installation and tightening, the fastener 7 is spot-welded to the support column 51.

[0035] In another specific embodiment, the fixed support connector 5 includes a supporting scallop plate 54, a lower support plate 53 fixedly mounted on the top of the supporting scallop plate 54, and a stud 55 fixedly mounted on the lower support plate 53. The connecting plate 61 of the inner lining support 6 passes through the stud 55 and is placed on the lower support plate 53. Preferably, the lower support plate 53 is welded to the supporting scallop plate 54, and the stud 55 is spot-welded to the lower support plate 53; the fastener 7 is a nut, which is adapted to the stud 55, and after installation and tightening, the fastener 7 is spot-welded to the stud 55. The supporting scallop plate 54 is as follows: Figure 8As shown, the support scallop plate 54 is in square or trapezoidal plate shape, and is welded and fixed with the outer shell body. Preferably, to reduce the weight of the support scallop plate 54 and the length of the welding seam between the support scallop plate 54 and the outer shell body 1, a second notch 541 is formed on the side of the support scallop plate 54 which is in contact with the outer shell body 1; to avoid the stud 55, a third notch 542 is formed on the side of the support scallop plate 54 which is close to the lower support plate 53. Further, the support scallop plate 54 is provided with a bent reinforcing edge 543 to increase the rigidity of the support scallop plate 54.

[0036] Preferably, the through hole on the connecting plate 61 of the inner lining support 6 is in interference fit with the support column 51 or the stud 55, so that the inner lining support 6 has a certain space for movement to meet the deformation difference requirement of the thermal insulation layer and the heat preservation layer.

[0037] The utility model discloses a fixing support connecting piece and an inner lining support are arranged in the heat preservation layer and the heat insulation layer, and the connecting position of the two is arranged at the joint of the heat preservation layer and the heat insulation layer. There is no support stud or other redundant structural member passing through the inner lining plate to be directly exposed in the high-temperature gas passage. The utility model can reduce the direct heat transfer and loss, achieve better heat preservation effect, make the temperature of the outer shell body relatively low, reduce the safety hidden trouble factors around the equipment, have good heat insulation effect, be favorable to the utilization of waste heat, better apply in the high-temperature flue gas passage, make the airflow passage resistance smaller, the flow field more smooth, the inner side of the passage smooth and flat, low flow resistance, and be more favorable to the high-speed high-temperature gas passing.

[0038] Of course, the utility model also can have other various embodiments, and those skilled in the art can make various corresponding changes and deformation according to the utility model without departing from the spirit and essence of the utility model. However, these corresponding changes and deformation should all belong to the protection scope of the claims attached to the utility model.

Claims

1. A high-temperature heat-insulating structure for an exhaust passage of a combustion engine, comprising an outer casing (1) of the exhaust passage, characterized by: The inner side of the outer shell (1) is sequentially paved with a heat preservation layer (2), a heat insulation layer (3) and an inner lining plate (4), the inner side of the outer shell (1) is fixedly provided with a fixed support connecting piece (5), the fixed support connecting piece (5) penetrates the heat preservation layer (2), the inner side of the inner lining plate (4) is fixedly provided with an inner lining support piece (6), the inner lining support piece (6) penetrates the heat insulation layer (3), and the inner lining support piece (6) is connected with the fixed support connecting piece (5) through a fastener (7); the inner lining plate (4) is provided with a through hole at a position corresponding to the inner lining support piece (6), and the through hole is sealingly connected with a hole cover plate (8).

2. The high-temperature heat retaining structure of the exhaust passage of the combustion engine according to claim 1, characterized in that: The heat preservation layer (2) is made of rock wool, and the heat insulation layer (3) is made of ceramic cotton.

3. The high-temperature heat retaining structure of the exhaust passage of the combustion engine according to claim 1, characterized in that: A gasket (9) is arranged between the inner lining support piece (6) and the fixed support connecting piece (5) and between the inner lining support piece (6) and the fastener (7), and the gasket (9) is a high-temperature-resistant heat insulation gasket.

4. The high-temperature heat retaining structure of the exhaust passage of the combustion engine according to claim 1, characterized in that: The inner lining support piece (6) comprises a connecting plate (61) and at least one support plate (62), the connecting plate (61) is provided with a through hole, the support plate (62) is arranged at one end of the connecting plate (61), the support plate (62) is inclined away from the axis direction of the through hole of the connecting plate (61), one end of the support plate (62) away from the connecting plate (61) is welded and fixed with the inner lining plate (4), and the inner lining support piece (6) is integrally formed by bending a sheet metal piece.

5. The high-temperature heat retaining structure of the exhaust passage of the combustion engine according to claim 4, characterized in that: The support plate (62) is provided with one, and the inner lining support piece (6) is in an "L" shape.

6. The high-temperature thermal insulation structure of the exhaust passage of the combustion engine according to claim 4, characterized in that: The support plate (62) is provided with two, the two support plates (62) are arranged on opposite sides of the connecting plate (61), and the inner lining support piece (6) is in a "U" shape; or the support plate (62) is provided with four, the four support plates (62) are arranged in a circumferential direction of the connecting plate (61), and the inner lining support piece (6) is in a "mouth" shape.

7. The high-temperature thermal insulation structure of the exhaust passage of the combustion engine according to claim 1, characterized in that: The fixed support connecting piece (5) comprises a support column (51), the middle upper portion of the support column (51) is provided with an external thread, the middle upper portion of the support column (51) is fixedly connected with a first nut (52), the upper portion of the first nut (52) is fixedly connected with a lower support plate (53), the inner lining support piece (6) is arranged on the lower support plate (53) through the support column (51), the fastener (7) is a nut, and the nut is matched with the external thread of the upper portion of the support column (51).

8. The high-temperature thermal insulation structure of the exhaust passage of the combustion engine according to claim 1, characterized in that: The fixed support connecting piece (5) comprises a support scallop plate (54), the top of the support scallop plate (54) is fixedly provided with the lower support plate (53), the lower support plate (53) is fixedly provided with a stud (55), the inner lining support piece (6) is arranged on the lower support plate (53) through the stud (55), the fastener (7) is a nut, and the nut is matched with the stud (55).

9. The high-temperature thermal insulation structure of the exhaust passage of the combustion engine according to claim 8, characterized in that: The support scallop plate (54) is in a square or trapezoidal plate shape, and a second notch (541) is arranged on the side of the support scallop plate (54) in contact with the outer shell (1).

10. The high-temperature thermal insulation structure of an exhaust passage of a combustion engine according to claim 9, characterized in that: The support scallop plate (54) is provided with a bent reinforcing edge (543).

Images