Heat preservation sealing structure for high-temperature through-wall pipe of waste heat boiler

Abstract

The utility model relates to a heat preservation sealing structure of a high-temperature through-wall pipe of a waste heat boiler, and belongs to the technical field of boiler equipment. The through-wall pipe penetrates through the flue wall body, the expansion joint is arranged on the outer side of the flue wall body and arranged on the through-wall pipe in a sleeved mode, the flue wall body comprises a flue protection plate, an inner protection plate and a heat preservation layer between the flue protection plate and the inner protection plate, one end of the expansion joint is fixedly connected with the flue protection plate in a sealed mode, and the other end of the expansion joint is fixedly connected with the through-wall pipe in a sealed mode. One end of the wall bushing is fixedly connected with the flue protection plate in a sealing manner, the other end of the wall bushing is fixedly connected with the inner protection plate in a sealing manner, a gap between the inner wall of the wall bushing and the outer wall of the wall bushing is filled with a thermal insulation material, and the sealing element is connected between the wall bushing and the inner protection plate in a flexible connection manner. By improving the heat preservation sealing structure of the through-wall pipe, the heat preservation sealing effect of the flue through-wall part is effectively improved, and the safety risk during operation of a boiler is reduced.

Description

Technical Field

[0001] This utility model relates to a heat preservation and sealing structure for a high-temperature through-wall pipe of a waste heat boiler, belonging to the technical field of boiler equipment. Background Technology

[0002] Gas turbine waste heat boilers are generally multi-pressure working fluid systems with complex piping layouts. They typically require pipes connecting to the heating surface to extend through the boiler flue. To prevent flue gas leakage and heat loss, the insulation and sealing structure at the pipe penetration points needs to be designed. Existing pipe penetration insulation and sealing structures include... Figure 1 As shown: the through-wall pipe 2 passes through the inner protective plate 12, the insulation layer 13, and the flue duct protective plate 11. On the inner side of the flue, a sliding cover plate 901 and a clamping plate 902 are installed on the inner protective plate 12. The sliding cover plate 901 covers the gap between the through-wall pipe 2 and the inner protective plate 12 and is fixed by the clamping plate 902. The through-wall pipe 2 passes through the sliding cover plate 901 and forms a sliding connection with it. The through-wall pipe 2 can slide along the inner protective plate 12 within the range defined by the clamping plate 902. On the outer side of the flue, the through-wall pipe 2 is wrapped with insulation material and an expansion joint 5 is installed. One end of the expansion joint 5 is sealed to the flue duct protective plate 11 and the other end is sealed to the through-wall pipe 2. The remaining pipe sections of the through-wall pipe 2 are wrapped with insulation material and an outer protective plate.

[0003] The aforementioned thermal insulation and sealing structure mainly achieves thermal insulation and sealing by installing a sliding cover plate on one side inside the furnace and an expansion joint 5 on the other side outside the furnace, thus meeting the thermal expansion displacement requirements of the through-wall pipe 2. However, due to unfavorable factors such as high temperatures of flue gas and medium inside the furnace and large thermal expansion displacement of the pipe, this structure has the following defects in actual use:

[0004] 1. The relative sliding between the through-wall pipe 2 and the sliding cover plate 9 is prone to jamming, which causes the inner protective plate 12 to be torn or even fall off under stress. The flue gas directly washes over the insulation layer 13, resulting in the loss of insulation material in the flue and failure of the insulation effect.

[0005] Second, when the boiler is frequently started and stopped and the thermal expansion displacement of the through-wall pipe 2 is large, the insulation layer 13 forms a local cavity due to the compression of the through-wall pipe 2. High-temperature flue gas passes through the cavity and comes into contact with the flue liner 11, causing local overheating, which not only affects the structural safety of the flue, but also brings risks to personnel safety. Summary of the Invention

[0006] This utility model mainly addresses the technical problems existing in the prior art, such as the easy damage caused by the thermal expansion displacement of the flue through the wall pipe and the easy occurrence of local overheating. It provides a heat preservation and sealing structure for the high-temperature through-wall pipe of the waste heat boiler that can better meet the requirements of thermal expansion displacement of the through-wall pipe.

[0007] The present invention addresses the aforementioned technical problems primarily through the following technical solution: The present invention includes a flue wall, a through-wall pipe penetrating the flue wall, and an expansion joint fitted onto the through-wall pipe on the outside of the flue wall. The flue wall includes a flue liner, an inner liner, and an insulation layer between them. One end of the expansion joint is sealed and fixedly connected to the flue liner, while the other end is sealed and fixedly connected to the through-wall pipe. The invention is characterized by further including a through-wall sleeve installed in the flue wall for the through-wall pipe to pass through, and a sealing element covering the gap between the through-wall sleeve and the through-wall pipe on the inside of the flue wall. One end of the through-wall sleeve is sealed and fixedly connected to the flue liner, while the other end is sealed and fixedly connected to the inner liner. The gap between the inner wall of the through-wall sleeve and the outer wall of the through-wall pipe is filled with insulation material. The sealing element is connected between the through-wall pipe and the inner liner in a flexible connection manner, and the sealing element is made of high-temperature resistant fiber cloth.

[0008] Preferably, the expansion joint is wrapped with an external insulation layer.

[0009] Preferably, the outer side of the external insulation layer is covered with an annular protective plate, which is fixedly connected to the flue duct protective plate.

[0010] Preferably, the annular liner includes a first liner section fixedly connected to the flue liner and a second liner section flexibly connected to the first liner section via a connector. The second liner section is flexibly connected to the second liner section via an annular seal, and the connector is made of high-temperature resistant fiber cloth.

[0011] Preferably, the expansion joint is sealed and fixed to the through-wall pipe via a flange.

[0012] This utility model has a simple structure and the following advantages:

[0013] In this invention, a through-wall sleeve is installed at the wall penetration point of the flue to protect the inner lining plate and insulation layer of the flue from the thermal expansion displacement of the through-wall pipe, making the insulation structure of the flue stable and reliable and preventing local overheating of the flue wall. The gap between the through-wall sleeve and the through-wall pipe is filled with insulation material, which can effectively reduce the heat loss of the working fluid inside the through-wall pipe. A sealing element is set on the inner side of the flue wall to block the flue gas and prevent the flue gas from entering the gap between the through-wall sleeve and the through-wall pipe. The sealing element is a flexible connection between the through-wall pipe and the inner lining plate, which allows the through-wall pipe to release its thermal expansion displacement relatively smoothly on the inner side of the flue wall. The sealing element is made of high-temperature resistant fiber cloth to meet the requirements of high temperature resistance and flexible connection.

[0014] Furthermore, wrapping the outer wall of the expansion joint with an external insulation layer can insulate the area around the expansion joint and reduce heat loss of the working fluid inside the through-wall pipe.

[0015] Furthermore, by covering the outer insulation layer with a ring-shaped protective plate, the service life of the outer insulation layer can be improved.

[0016] Furthermore, in the annular liner, the first liner is fixed to the flue liner, and the second liner is flexibly connected to the first liner. The second liner and the outer insulation layer can move together with the expansion joint, thereby avoiding the expansion joint from pulling on the outer insulation layer and the annular liner during expansion and contraction, which would cause damage to the outer insulation layer and the annular liner.

[0017] Therefore, by improving the insulation and sealing structure of the through-wall pipe, this utility model effectively improves the insulation and sealing effect of the flue through-wall part and reduces the safety risks during boiler operation. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of existing technology.

[0019] Appendix Figure 2 This is a schematic diagram of a preferred embodiment of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. Flue wall; 11. Flue liner; 12. Inner liner; 13. Insulation layer; 2. Through-wall pipe; 3. Through-wall sleeve; 4. Sealing element; 5. Expansion joint; 6. Outer insulation layer; 7. Annular liner; 71. First liner; 72. Second liner; 73. Connector; 8. Flange; 901. Sliding cover; 902. Clamping plate. Detailed Implementation

[0021] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0022] Example 1: As shown in the attached document Figure 2 As shown, this utility model includes a flue wall 1, a through-wall pipe 2 penetrating the flue wall 1, a through-wall sleeve 3 and a sealing element 4 fitted onto the through-wall pipe 2, and an expansion joint 5 fitted onto the through-wall pipe 2 on the outside of the flue wall 1.

[0023] The flue wall 1 includes a flue liner 11, an inner liner 12, and an insulation layer 13 between the two;

[0024] One end of the through-wall sleeve 3 is sealed and fixedly connected to the flue duct liner 11, while the other end is sealed and fixedly connected to the inner liner 12. The gap between the inner wall of the through-wall sleeve 3 and the outer wall of the through-wall pipe 2 is filled with thermal insulation material.

[0025] The sealing element 4 is installed inside the flue wall 1 and one end is fixedly and sealed to the through-wall pipe 2, while the other end is fixedly and sealed to the inner protective plate 12. The sealing element 4 is made of high-temperature resistant fiber cloth.

[0026] One end of the expansion joint 5 is sealed and fixedly connected to the flue liner 11, while the other end is sealed and fixedly connected to the through-wall pipe 2 via the flange 8. The outer wall of the expansion joint 5 is wrapped with an external insulation layer 6, and the gap between the expansion joint 5 and the through-wall pipe 2 is filled with insulation material.

[0027] The outer insulation layer 6 is covered with a ring-shaped protective plate 7 on the outside;

[0028] The annular guard plate 7 includes a first guard plate 71 fixedly connected to the flue guard plate 11, and a second guard plate 72 flexibly connected to the first guard plate 71 via a connector 73. The connector 73 is made of high-temperature resistant fiber cloth.

[0029] When this utility model is applied to the flue of a waste heat boiler, a wall sleeve 3 is installed at the wall penetration point of the wall penetration pipe 2. The wall sleeve 3 can be sealed and fixed to the inner protective plate 12 and the flue protective plate 11 by welding or flange connection.

[0030] Expansion joint 5 can be sealed and fixed to flue liner 11 by welding or flange connection;

[0031] The sealing element 4 and the connecting element 73 are made of high-temperature resistant fiber cloth and are sealed and fixed by clamps or aluminum foil tape.

[0032] Of course, the above-described drawings and embodiments are only for explaining and illustrating this utility model, and should not be construed as undue limitation of this utility model. All technical solutions obtained by those skilled in the art through equivalent adjustments and variations based on this utility model fall within the protection scope of this utility model.

Claims

1. A heat preservation sealing structure of a high-temperature penetration tube of a waste heat boiler, comprising a flue wall (1), a penetration tube (2) penetrating through the flue wall (1), and an expansion joint (5) sleeved on the penetration tube (2) outside the flue wall (1), wherein the flue wall (1) comprises a flue shield (11), an inner shield (12), and a heat preservation layer (13) between the flue shield (11) and the inner shield (12), one end of the expansion joint (5) is sealingly and fixedly connected with the flue shield (11), and the other end is sealingly and fixedly connected with the penetration tube (2), characterized in that, The flue wall (1) further comprises a through-wall sleeve (3) for the through-wall pipe (2) to pass through, and a sealing member (4) covering the gap between the through-wall sleeve (3) and the through-wall pipe (2) on the inner side of the flue wall (1), one end of the through-wall sleeve (3) is sealingly and fixedly connected with the flue guard plate (11), and the other end is sealingly and fixedly connected with the inner guard plate (12), the gap between the inner wall of the through-wall sleeve (3) and the outer wall of the through-wall pipe (2) is filled with thermal insulation material, the sealing member (4) is connected between the through-wall pipe (2) and the inner guard plate (12) in a flexible manner, and the sealing member (4) is made of high-temperature-resistant fiber cloth.

2. The heat preservation sealing structure of high temperature penetration tube of waste heat boiler according to claim 1, characterized in that, The outer wall of the expansion joint (5) is wrapped with an outer thermal insulation layer (6).

3. A heat preservation sealing structure of a high-temperature penetration tube of a waste heat boiler according to claim 2, characterized in that, The outer side of the outer thermal insulation layer (6) is covered with an annular guard plate (7), and the annular guard plate (7) is connected with the flue guard plate (11).

4. A heat preservation sealing structure of a high temperature penetration tube of a waste heat boiler according to claim 3, characterized in that, The annular guard plate (7) comprises a first section guard plate (71) fixedly connected with the flue guard plate (11) and a second section guard plate (72) flexibly connected with the first section guard plate (71) through a connecting member (73), and the connecting member (73) is made of high-temperature-resistant fiber cloth.

5. A heat preservation sealing structure of high temperature penetration tube of waste heat boiler according to claim 1 or 2 or 3 or 4, characterized in that, The expansion joint (5) is sealingly and fixedly connected with the through-wall pipe (2) through a flange (8).

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