Heat insulation device for nonmetal expansion joint of gas turbine

Abstract

The utility model discloses a gas turbine nonmetal expansion joint heat insulation device which comprises a frame, the frame is of a columnar structure with the upper end and the lower end extending horizontally, the top of the frame is covered with a skin, an inner protection plate is arranged at the bottom of the frame, and the inner protection plate and the horizontal plane of the bottom of the frame are fixed through a pull rod set. By changing the connection mode of the non-metal expansion joint and the arrangement of internal heat preservation, the heat insulation device with multi-direction thermal expansion compensation, large compensation amount and good sealing performance is obtained, expansion between an outlet of a gas turbine and an inlet of a waste heat boiler is free, noise elimination and vibration reduction are achieved, connection welding seam cracking and smoke leakage are avoided, and the service life of the gas turbine is prolonged. Meanwhile, good heat preservation and heat insulation effects can be always kept between the expansion joint and the inner wall and the outer wall of the flue, and the over-temperature phenomenon of a flue outlet of a gas turbine and the exterior of the expansion joint body is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion joint insulation, in particular to a non-metal expansion joint insulation device for a combustion engine. Background Art

[0002] The connection between the gas turbine outlet and the waste heat boiler inlet of the gas turbine power plant adopts non-metallic expansion joints for transition. This area is subjected to high temperature of 600-620℃ for a long time, and the compensation amount in three-dimensional direction is large. Due to frequent start and stop, it is easy to cause cracks in the connection weld between the gas turbine outlet and the waste heat boiler inlet, and cause a large gap between the inner protective plate and the insulation layer. At present, the non-metallic expansion joints of the flue configured by the gas turbine adopt the conventional layer-by-layer insulation layer and screw fixing method in the design of internal insulation. This arrangement has the characteristics of low cost and convenient production.

[0003] However, in actual operation, since the insulation layer is fixed on the slender screw, there is constant pulling between the screw and the insulation layer during the long-term compression and stretching process, causing the flocculent insulation layer to be gradually torn and shifted. After the gap increases, the high-temperature flue gas can easily pass through the gap, and then rise and pass outward along the circumference of the flue, causing the outer wall of the flue to overheat. At present, the surface of the gas turbine flue and non-metallic expansion joints generally have overheating imagination, and long-term overheating will cause great damage to the supporting structure strength of the flue and expansion joint, seriously affecting the safe and reliable operation of the unit. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model solves the problem that the connection weld between the gas turbine outlet and the waste heat boiler inlet is prone to cracking and smoke leakage due to insufficient expansion freedom.

[0005] A non-metallic expansion joint insulation device for a fuel engine comprises a frame, which is a columnar structure with upper and lower ends extending horizontally, the top of the frame is covered with a skin, an inner guard plate is arranged at the bottom of the frame, the inner guard plate is fixed to the horizontal plane of the bottom of the frame by a tie rod group, and the interior of the frame is filled with thermal insulation cotton.

[0006] Furthermore, ribs are provided on both sides of the frame.

[0007] Furthermore, the skin is fixed to the frame by skin bolts, and a pressure plate is provided between the skin bolts and the skin.

[0008] Furthermore, a guide plate is circumferentially arranged on the inner side of the bottom of the frame, and a thermal insulation pillow is fixedly arranged on the upper end of the guide plate.

[0009] Furthermore, vertical plates are arranged at both ends of the horizontal plane at the bottom of the frame, one end is vertically facing the skin, and the other end is vertically facing the inner guard plate. A sealing gasket is fixed on the vertical plate by a sealing gasket bolt, and the sealing gasket is arranged on the outside of the frame.

[0010] Furthermore, an inclined step protrusion is arranged at the center of the inner guard plate, and a hole is dug inside the starting end of the protrusion.

[0011] The beneficial effects of the utility model are as follows: the present application changes the connection mode of the non-metallic expansion joint and the arrangement of the internal insulation, thereby obtaining an insulation device with multi-directional thermal expansion compensation, large compensation amount and good sealing performance, so that the expansion between the gas turbine outlet and the waste heat boiler inlet is free, noise reduction and vibration reduction are achieved, and the cracking of the connecting weld and the smoke leakage are avoided. At the same time, the inner and outer walls of the expansion joint and the flue are always kept in good thermal insulation, which solves the overheating phenomenon of the gas turbine flue outlet and the outside of the expansion joint body, and avoids the inner insulation layer from being constantly pulled between the screw and the inner insulation layer during the long-term compression and stretching process, causing the flocculent inner insulation layer to be gradually torn and shifted. After the gap is enlarged, the high-temperature smoke can easily pass through the gap, and then rise and pass outward along the circumference of the flue, eventually causing the outer wall of the flue to overheat. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of a non-metallic expansion joint insulation device for a gas turbine;

[0013] Figure 2 It is a top view of a non-metallic expansion joint insulation device for a gas turbine.

[0014] In the figure: 1-skin bolts, 2-insulation cotton, 3-skin, 4-pressure plate, 5-frame, 6-sealing gasket, 7-sealing gasket bolts, 8-guide plate, 9-insulation pillow, 10-pull rod group, 11-inner guard plate, 12-rib plate. DETAILED DESCRIPTION

[0015] The following is an explanation of the implementation of the present invention by specific specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to the implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details will be included in the following description. The present utility model can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present utility model, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. It should be noted that in this specification, similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures.

[0016] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate quantity restrictions, but indicate the existence of at least one. Words such as "set", "connected", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances. The directions or positional relationships indicated by “upper”, “lower”, “left”, “right”, “inner”, “bottom”, etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.

[0017] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0018] In this embodiment, as shown in the attached Figure 1~2 As shown, a non-metallic expansion joint insulation device for a fuel engine includes a frame 5, which is a columnar structure extending horizontally at both ends. The top of the frame 5 is covered with a skin 3, and an inner guard plate 11 is arranged at the bottom of the frame 5. The inner guard plate 11 is fixed to the horizontal plane of the bottom of the frame 5 by a tie rod group 10. The frame 5 is also filled with thermal insulation cotton 2, and the thermal insulation cotton 2 can be selected from aluminum silicate felt. A stainless steel wire mesh is synchronously arranged on the inner side of the thermal insulation cotton 2 for fixing it in the horizontal direction, and the stainless steel wire mesh is fixedly connected to the frame 5.

[0019] Furthermore, ribs 12 are provided on both sides of the frame 5 .

[0020] Furthermore, the skin 3 is fixed to the frame 5 by means of the skin bolts 1 , and a pressure plate 4 is provided between the skin bolts 3 and the skin 3 .

[0021] Furthermore, a guide plate 8 is circumferentially arranged on the inner side of the bottom of the frame 5, and a thermal insulation pillow 9 is fixedly arranged on the upper end of the guide plate 8.

[0022] Furthermore, vertical flat plates are provided at both ends of the bottom horizontal plane of the frame 5, one end is vertically facing the skin 3, and the other end is vertically facing the inner guard plate 11. A sealing gasket 6 is fixed on the vertical flat plate by a sealing gasket bolt 7, and the sealing gasket 6 is arranged on the outside of the frame 5.

[0023] Furthermore, an inclined step protrusion is provided at the center of the inner guard plate 11, and a hole is dug inside the starting end of the protrusion.

[0024] The specific working principle of this application is as follows:

[0025] The setting of the pull rod group 10 is conducive to fixing the thermal insulation cotton 2 and the frame 5, and synchronously stretching and displacing them to avoid tearing and improve the thermal insulation effect; the setting of the stainless steel wire mesh is conducive to the overall fixation of the thermal insulation cotton 2 and improves the fixing strength of the thermal insulation cotton 2 on the pull rod group 10.

[0026] The beneficial effects of the utility model are as follows: the present application changes the connection mode of the non-metallic expansion joint and the arrangement of the internal insulation, thereby obtaining an insulation device with multi-directional thermal expansion compensation, large compensation amount and good sealing performance, so that the expansion between the gas turbine outlet and the waste heat boiler inlet is free, noise reduction and vibration reduction are achieved, and the cracking of the connecting weld and the smoke leakage are avoided. At the same time, the inner and outer walls of the expansion joint and the flue are always kept in good thermal insulation, which solves the overheating phenomenon of the gas turbine flue outlet and the outside of the expansion joint body, and avoids the inner insulation layer from being constantly pulled between the screw and the inner insulation layer during the long-term compression and stretching process, causing the flocculent inner insulation layer to be gradually torn and shifted. After the gap is enlarged, the high-temperature smoke can easily pass through the gap, and then rise and pass outward along the circumference of the flue, eventually causing the outer wall of the flue to overheat.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A non-metallic expansion joint insulation device for a gas turbine, characterized in that: The invention comprises a frame (5), wherein the frame (5) is a columnar structure with upper and lower ends extending horizontally, the top of the frame (5) is covered with a skin (3), the bottom of the frame (5) is provided with an inner protective plate (11), the inner protective plate (11) and the horizontal plane of the bottom of the frame (5) are fixed by a tie rod group (10), and the interior of the frame (5) is filled with thermal insulation cotton (2).

2. A non-metallic expansion joint insulation device for a gas turbine according to claim 1, characterized in that: It also includes rib plates (12) arranged on both sides of the frame (5).

3. A non-metallic expansion joint insulation device for a gas turbine according to claim 2, characterized in that: The invention also includes a skin (3) being fixed to a frame (5) via skin bolts (1), and a pressure plate (4) being provided between the skin bolts (1) and the skin (3).

4. A non-metallic expansion joint insulation device for a gas turbine according to claim 1, characterized in that: The frame (5) further comprises a flow guide plate (8) provided in an annular direction on the inner side of the bottom thereof, and a heat preservation pillow (9) is fixedly provided on the upper end of the flow guide plate (8).

5. A non-metallic expansion joint insulation device for a gas turbine according to claim 1, characterized in that: It also includes vertical flat plates arranged at both ends of the bottom horizontal surface of the frame (5), one end of which is vertically oriented toward the skin (3) and the other end of which is vertically oriented toward the inner guard plate (11), and a sealing gasket (6) is fixed to the vertical flat plate by a sealing gasket bolt (7), and the sealing gasket (6) is arranged on the outer side of the frame (5).

6. A non-metallic expansion joint insulation device for a gas turbine according to claim 1, characterized in that: An inclined step protrusion is provided at the center of the inner guard plate (11), and a hole is dug inside the starting end of the protrusion.

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