Sealing structure for through-wall pipeline of waste heat boiler

Abstract

The utility model relates to a waste heat boiler through-wall pipeline sealing structure, and belongs to the technical field of waste heat boiler flue through-wall pipeline expansion and sealing. According to the technical scheme, a flexible heat preservation and insulation layer (8) is arranged on a through-wall pipe (9), an upper metal pipe frame (2) is fixed to an outer furnace wallboard (6), a lower metal pipe frame (4) is fixed to the through-wall pipe (9), and the upper metal pipe frame (2) and the lower metal pipe frame (4) respectively press the flexible heat preservation and insulation layer (8); the non-metal flexible sealing material (3) is wound on the upper metal pipe frame (2) and the lower metal pipe frame (4), and the non-metal flexible sealing material (3) is connected and sealed together through the metal bolt sealing piece (7) after being wound; and the nonmetal flexible sealing material (3) is fastened on the upper metal pipe frame (2) and the lower metal pipe frame (4) by the upper metal clamp (1) and the lower metal clamp (5). The utility model has the beneficial effects of preventing smoke leakage, reducing heat dissipation damage and avoiding expansion deformation of the pipeline.

Description

Technical Field

[0001] The utility model relates to a sealing structure for a waste heat boiler through-the-wall pipeline, belonging to the technical field of expansion and sealing of a waste heat boiler flue through-the-wall pipeline. Background Art

[0002] Combined cycle power generation units have the advantages of high thermal efficiency, flexible regulation, fast start-up speed, low emission indicators, and the ability to extract steam for external supply. These advantages ensure their rapid development and application in industrial enterprises.

[0003] The waste heat boiler supporting the combined cycle generator set is a double-pressure self-deoxygenating, horizontal, non-supplementary, natural circulation gas turbine waste heat boiler. The flue gas temperature discharged by the gas turbine is about 530℃, and the flue gas pressure is 4-5KPa. It enters the boiler flue from the side wall of the waste heat boiler, exchanges heat with the high and low pressure heat exchange tube screens in turn, and is discharged through the chimney. The boiler adopts a frame structure, and the boiler furnace wall is welded and assembled as a whole. The heat exchange tube groups are arranged in the flue inside the boiler furnace wall, and the high and low pressure drums and steam manifolds are placed outside the boiler furnace wall. Therefore, pipes of different diameters are arranged through the furnace wall. At present, a bellows metal expansion joint must be installed at the junction of the through-wall pipe and the outer furnace wall to prevent the flue gas from leaking out while ensuring the thermal expansion of the pipe. One end of the metal expansion joint is welded to the outer wall, and the other end is welded to the through-wall pipe. The bellows and the pipe are filled with insulation material for heat insulation and arranged outside the furnace wall.

[0004] During the operation of the unit, it was found that the heat insulation material and the wall-penetrating pipe sealing structure of the waste heat boiler furnace top were damaged due to steam release, boiler pipe leakage, water leakage in rainy season and other factors, resulting in air leakage and overheating of the furnace top. Overheating not only increases the heat dissipation loss of the boiler, but also causes the outer furnace wall of the boiler to expand and deform, or even tear and leak, which has a serious impact on the load-bearing support structure and electrical instrument lines, threatening the safe operation of the unit. Because the furnace bottom wall-penetrating pipe seal is arranged at the lowest point of the furnace bottom, and the two ends of the bellows expansion joint are welded and sealed, when the pipe screen in the furnace leaks, a large amount of water accumulates at the seal of the furnace bottom wall-penetrating pipe. The sulfide in the flue gas combines with water, causing acid corrosion of the wall-penetrating pipe at the seal of the furnace bottom bellows, making the pipe thinner and leaking difficult to detect. Due to the installation characteristics of the bellows sealing device, when the insulation materials at the furnace bottom and furnace roof are replaced, the original through-wall pipe sealing device must be destructively removed when checking for leaks in the through-wall pipes at the furnace bottom. The construction is difficult and the cost of replacing the bellows sealing device is high. There is an urgent need for a new through-wall pipe sealing structure to meet the safety integrity of the boiler through-wall pipes. Utility Model Content

[0005] The utility model aims to provide a sealing structure for a waste heat boiler through-wall pipe to prevent smoke leakage, reduce heat dissipation damage, avoid pipe expansion and deformation, and solve the problems existing in the background technology.

[0006] The technical solution of the utility model is:

[0007] A sealing structure for a through-wall pipe of a waste heat boiler comprises an upper metal clamp, an upper metal pipe rack, a non-metallic flexible sealing material, a lower metal pipe rack, a lower metal clamp, an outer furnace wall panel, a metal bolt seal, a flexible thermal insulation layer and a through-wall pipe, wherein the flexible thermal insulation layer is arranged on the through-wall pipe, the upper metal pipe rack is fixed on the outer furnace wall panel, the lower metal pipe rack is fixed on the through-wall pipe, the upper metal pipe rack and the lower metal pipe rack respectively press the flexible thermal insulation layer; the non-metallic flexible sealing material is wound around the upper metal pipe rack and the lower metal pipe rack, and after the non-metallic flexible sealing material is wound, it is connected and sealed together through a metal bolt seal; the upper metal clamp and the lower metal clamp fasten the non-metallic flexible sealing material to the upper metal pipe rack and the lower metal pipe rack.

[0008] The metal bolt seal comprises a metal bolt seal substrate, a fixing bolt and a metal bolt seal clamping plate. After the non-metallic flexible sealing material is wound, the two ends overlap between the metal bolt seal substrate and the metal bolt seal clamping plate and are fixed together by the fixing bolt.

[0009] The upper metal clamp is composed of two steel strips, the two ends of the two steel strips are connected together by bolts, and the two steel strips fasten the upper end of the non-metallic flexible sealing material to the upper metal pipe rack. The structure of the lower metal clamp is the same as that of the upper metal clamp.

[0010] The flexible thermal insulation layer is externally wrapped and fastened with glass fiber cloth.

[0011] The upper metal pipe rack and the lower metal pipe rack are both circular racks.

[0012] The beneficial effects of the utility model are as follows: the sealing structure has good expansion absorption capacity and sealing effect, and corresponding expansion seals can be made according to the diameters of different wall-penetrating pipes. It has a simple structure, low production cost, simple maintenance and disassembly operations, and is convenient for inspection, leak detection and replacement of insulation materials, while also being able to effectively improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is the front view of the metal clamp of the utility model;

[0015] Figure 3 This is a side view of the metal clamp of the utility model;

[0016] Figure 4 This is a schematic diagram of the metal bolt seal of the utility model;

[0017] In the figure: metal clamp 1, upper metal pipe rack 2, non-metallic flexible sealing material 3, lower metal pipe rack 4, lower metal clamp 5, outer furnace wall panel 6, metal bolt seal 7, flexible thermal insulation layer 8, wall pipe 9, metal clamp bolt hole 10, left half metal clamp 11, right half metal clamp 12, right half metal clamp fixing bolt reserved hole 13, metal bolt seal base plate 14, fixing bolt 15, metal bolt seal clamp plate 16. DETAILED DESCRIPTION

[0018] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0019] See attached Figure 1-4 A sealing structure for a waste heat boiler through-wall pipe comprises an upper metal clamp 1, an upper metal pipe rack 2, a non-metallic flexible sealing material 3, a lower metal pipe rack 4, a lower metal clamp 5, an outer furnace wall panel 6, a metal bolt seal 7, a flexible thermal insulation layer 8 and a through-wall pipe 9, wherein the flexible thermal insulation layer 8 is arranged on the through-wall pipe 9, the upper metal pipe rack 2 is fixed on the outer furnace wall panel 6, the lower metal pipe rack 4 is fixed on the through-wall pipe 9, the upper metal pipe rack 2 and the lower metal pipe rack 4 respectively press the flexible thermal insulation layer 8; the non-metallic flexible sealing material 3 is wound around the upper metal pipe rack 2 and the lower metal pipe rack 4, and the non-metallic flexible sealing material 3 is connected and sealed together through the metal bolt seal 7 after being wound; the upper metal clamp 1 and the lower metal clamp 5 fasten the non-metallic flexible sealing material 3 to the upper metal pipe rack 2 and the lower metal pipe rack 4.

[0020] In this embodiment, refer to the attached Figure 1-4 The sealing structure of the through-wall pipe of the waste heat boiler comprises an upper metal pipe rack 2 fixed to the outer furnace wall plate 6, a lower metal pipe rack 4 fixed to the through-wall pipe 9, an upper metal clamp 1 and a lower metal clamp 5 for fixing the non-metallic flexible sealing material 3, a metal bolt seal 7 for pressing and sealing the non-metallic flexible sealing material 3, and a flexible thermal insulation layer 8 on the through-wall pipe 9, wherein:

[0021] The non-metallic flexible sealing material 3 is a non-metallic fabric skin, such as a fluororubber skin or a composite high-temperature resistant skin; the flexible thermal insulation layer 8 is a composite silicate fiber wool, asbestos board or rock wool.

[0022] The non-metallic flexible sealing material 3 is wound around the upper metal pipe rack 2 and the lower metal pipe rack 4 of the same pipe diameter to form a tube shape. After winding, holes are left at the overlapping places of the two ends of the non-metallic flexible sealing material 3 and are sealed and fixed by metal bolt seals 7.

[0023] See attached Figure 4The metal bolt seal 7 includes a metal bolt seal substrate 14, a fixing bolt 15 and a metal bolt seal clamp 16. After the non-metallic flexible sealing material 3 is wrapped, both ends overlap between the metal bolt seal substrate 14 and the metal bolt seal clamp 16, and are fixed together by the fixing bolt 15.

[0024] When the through-wall pipe 9 expands due to heat, this sealing method has two axial displacement points. The non-metallic flexible sealing material 3 can be displaced axially along the through-wall pipe 9, and the upper metal clamp 1 and the lower metal clamp 5 can be displaced axially on the upper metal pipe rack 2 and the lower metal pipe rack 4. Figure 1 shown.

[0025] The flexible thermal insulation layer 8 is wrapped and fastened with glass fiber cloth on the outside, and has thermal insulation and sealing functions. This layer is fixed by the upper metal pipe rack 2 and the lower metal pipe rack 4, and can adapt to the frequent expansion and contraction of the pipeline. Due to the shape characteristics of the upper metal pipe rack 2 and the lower metal pipe rack 4, the axial and longitudinal fixation can prevent the thermal insulation layer from deformation and falling off, which can effectively improve the thermal insulation performance and sealing effect, and at the same time enhance the durability of the thermal insulation layer.

[0026] See attached Figure 2 , 3 The upper metal clamp 1 is the same as the lower metal clamp 5. The main body is composed of two steel strips, and angle steels are welded on both sides of the steel strips. One side of the angle steel is welded to the steel strip, and the other side is punched for bolt holes. During the welding process, it should be noted that the angle steel should not be welded at the end of the steel strip, but a portion of the reserved length should be left. In this way, when the upper metal clamp 1 and the lower metal clamp 5 are fixed, a part of the steel strip can be pressed together, thereby improving the fixing effect and sealing performance of the upper metal clamp 1 and the lower metal clamp 5. Through the cooperation of the angle steel and the steel strip, sufficient strength and stability can be provided. At the same time, through the design of the reserved length, it can better adapt to various changes in the actual installation environment. When there is an error between the actual installation size and the design size, the reserved length of the steel strip can be used to adapt to this error, providing better fixing and sealing effects.

[0027] The installation and disassembly process of the waste heat boiler wall pipe sealing structure is as follows:

[0028] (1) When installing the wall-penetrating pipe seal, first calculate the installation position and distance of the upper metal pipe rack 2 and the lower metal pipe rack 4, insulate and fix the wall-penetrating pipe 9 with the flexible thermal insulation layer 8, calculate the distance between the inner and outer pipe diameters of the upper metal pipe rack 2 and the lower metal pipe rack 4 and the wall-penetrating pipe 9, ensure the thickness of the thermal insulation layer and press and fill it tightly, and weld the upper metal pipe rack 2 around the flexible thermal insulation layer 8 and fix it on the outer furnace wall panel 6, and at the same time weld the lower metal pipe rack 4 around the flexible thermal insulation layer 8 and fix it on the wall-penetrating pipe 9;

[0029] (2) Pass the fixing bolt 15 of the metal bolt seal substrate 14 through the hole at one end of the non-metallic flexible sealing material 3, and ensure that the upper end of the non-metallic flexible sealing material 3 is aligned with the upper metal pipe rack 2 fixed to the outer furnace wall panel 6, and the lower end is aligned with the lower metal pipe rack 4 on the through-wall pipe 9; wrap the non-metallic flexible sealing material 3 around the upper metal pipe rack 2 and the lower metal pipe rack 4 to seal; pass the fixing bolt 15 of the metal bolt seal substrate 14 through the hole at the other end to form a tubular surrounding structure, then use the upper metal clamp 1 to fix the upper end of the non-metallic flexible sealing material 3, pass the right half metal clamp fixing bolt reserved hole 13 through the fixing bolt 15 of the metal bolt seal substrate 14, and fix the lower end of the non-metallic flexible sealing material 3 with the lower metal clamp 5, and the sealing and fixing of the upper and lower ends of the non-metallic flexible sealing material 3 are completed;

[0030] (3) The metal bolt seal clamping plate 16 is passed through the fixing bolts 15 of the metal bolt seal base plate 14 and fixed and clamped with nuts to ensure that the overlapping part of the non-metallic flexible sealing material 3 is sealed and fixed, thereby completing the installation of the wall-penetrating pipe seal.

[0031] When disassembling the wall-penetrating pipe seal, you can remove the nut on the fixing bolt 15, take off the metal bolt seal clamp 16, remove and remove the upper metal clamp 1 and the lower metal clamp 5, then remove the non-metallic flexible sealing material 3, and finally remove the metal bolt seal substrate 14 to complete the disassembly of the wall-penetrating pipe seal.

Claims

1. A sealing structure for a waste heat boiler through-wall pipe, characterized in that: The invention comprises an upper metal clamp (1), an upper metal pipe rack (2), a non-metallic flexible sealing material (3), a lower metal pipe rack (4), a lower metal clamp (5), an outer furnace wall panel (6), a metal bolt sealing member (7), a flexible thermal insulation layer (8) and a wall-penetrating pipe (9); the flexible thermal insulation layer (8) is arranged on the wall-penetrating pipe (9); the upper metal pipe rack (2) is fixed on the outer furnace wall panel (6); the lower metal pipe rack (4) is fixed on the wall-penetrating pipe (9); the upper metal pipe rack (2) and the lower metal pipe rack (4) respectively press the flexible thermal insulation layer (8); the non-metallic flexible sealing material (3) is wound around the upper metal pipe rack (2) and the lower metal pipe rack (4); after the non-metallic flexible sealing material (3) is wound, they are connected and sealed together by the metal bolt sealing member (7); the upper metal clamp (1) and the lower metal clamp (5) fasten the non-metallic flexible sealing material (3) to the upper metal pipe rack (2) and the lower metal pipe rack (4).

2. The sealing structure of a waste heat boiler wall-penetrating pipe according to claim 1, characterized in that: The metal bolt seal (7) comprises a metal bolt seal substrate (14), a fixing bolt (15) and a metal bolt seal clamp (16); the non-metallic flexible sealing material (3) is wound such that its two ends overlap between the metal bolt seal substrate (14) and the metal bolt seal clamp (16) and are fixedly connected together by the fixing bolt (15).

3. The sealing structure of a waste heat boiler wall-penetrating pipe according to claim 1, characterized in that: The upper metal clamp (1) is composed of two steel strips, the two ends of which are connected together by bolts. The two steel strips fasten the upper end of the non-metallic flexible sealing material (3) to the upper metal pipe rack (2). The structure of the lower metal clamp (5) is the same as that of the upper metal clamp (1).

4. The sealing structure of a waste heat boiler wall-penetrating pipe according to claim 1, characterized in that: The flexible thermal insulation layer (8) is externally wrapped and fastened with glass cloth.

5. The sealing structure of a waste heat boiler wall-penetrating pipe according to claim 1, characterized in that: The upper metal pipe rack (2) and the lower metal pipe rack (4) are both circular racks.

Images