Steam-water connection pipe sealing structure

Abstract

The utility model relates to a boiler sealing technical field, concretely relates to a steam -water connecting pipe sealing structure, including the support pipe that encloses steam -water connecting pipe outside setting, support pipe one end is sealedly connected with the top fender, and the inner wall of support pipe is close to the one end of top fender and is filled with temperature -resistant sealing filler layer between steam -water connecting pipe, and the inner wall of support pipe is connected with the tubular air bag that encloses steam -water connecting pipe setting away from top fender one end, and tubular air bag is communicated with the air pump for the tubular air bag inflation through gas pipe, to make tubular air bag tubular inner wall and steam -water connecting pipe closely adhere, and gas pipe is equipped with valve, and tubular air bag is communicated with the energy accumulator through the breather pipe, through above -mentioned structure, make the boiler steam -water connecting pipe sealing structure neither influence steam -water connecting pipe's expansion, and also can make up the cracking of expansion difference and the elasticity of thermal insulation cotton and the problem of ash leakage produced by poor, greatly promoted the sealing performance between steam -water connecting pipe and boiler top fender.

Description

Technical Field

[0001] This utility model relates to the field of boiler sealing technology, specifically to a sealing structure for a steam-water connection pipe. Background Technology

[0002] The top of a power plant boiler typically houses high-temperature components such as headers, steam-water connection pipes, and pipe panels, and is equipped with a boiler top sealing system. To prevent heat loss from the boiler top pipes and headers, and to prevent problems such as ash leakage and environmental pollution caused by poor primary sealing, the boiler top pipes and headers, which are difficult to insulate individually, are completely covered to form a large cover-like secondary seal. This entire system constitutes the boiler top liner, a large metal sealing plate installed on the boiler top and an important component of the boiler.

[0003] The steam-water connection pipe needs to extend from the top liner to the outside of the boiler. However, to allow for free expansion of the pipe, welding seals cannot be used where the pipe penetrates the liner. This leads to severe ash and hot gas leakage at this point, causing pollution to the surrounding environment and equipment, and requiring frequent and extensive manual cleaning. Furthermore, the leaked dust contains high-temperature heat, causing boiler heat loss. The light sulfides in the dust easily caking in humid, rainy environments, corroding surrounding equipment, reducing its performance and lifespan, and significantly increasing maintenance costs. Therefore, current technology typically uses insulation cotton to seal the connection between the steam-water pipe and the top liner. However, the sealing effect of insulation cotton is poor and fails to meet sealing requirements. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing structure for a steam-water connection pipe, which solves the problem that in the prior art, insulation cotton is usually filled between the steam-water connection pipe and the top protective plate for sealing, but the sealing effect of the insulation cotton is poor and it is difficult to meet the sealing requirements.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A sealing structure for a steam-water connection pipe includes a support pipe surrounding the outside of the steam-water connection pipe. One end of the support pipe is sealed to a top protective plate. A heat-resistant sealing filler layer is filled between the inner wall of the support pipe near the top protective plate and the steam-water connection pipe. A tubular airbag surrounding the steam-water connection pipe is connected to the inner wall of the support pipe away from the top protective plate. The tubular airbag is connected to an air pump for inflating the tubular airbag through an air supply pipe, so that the tubular inner wall of the tubular airbag is tightly fitted to the steam-water connection pipe. A valve is provided on the air supply pipe. An accumulator is connected to the tubular airbag through a vent pipe.

[0006] A further technical solution is that an elastic heat insulation layer is attached to the outer side of the steam-water connection pipe inside the support pipe.

[0007] A further technical solution is to use a flexible ceramic fiber blanket layer as the elastic insulation layer.

[0008] A further technical solution is to have a protective ring surrounding the end of the support tube furthest from the top protective plate.

[0009] A further technical solution is that the inner diameter of the protective ring is larger than the outer diameter of the steam-water connection pipe, and the inner diameter of the protective ring is smaller than the inner diameter of the support pipe.

[0010] A further technical solution is to use a graphite-nickel wire sealing filler layer as the temperature-resistant sealing filler layer.

[0011] Compared with the prior art, the beneficial effects of this utility model are: In this invention, the high-temperature resistant sealing packing layer not only ensures good sealing performance but also reduces the direct heat transfer from the boiler top plate to the gas bladder, thereby slowing down the aging and damage of the tubular gas bladder. By setting up the tubular gas bladder and accumulator, when the steam-water connection pipe heats up and expands, it compresses the tubular gas bladder, and the gas in the tubular gas bladder flows into the accumulator for storage. When the steam-water connection pipe cools down and contracts, it no longer compresses the tubular gas bladder. At this time, the accumulator releases the stored gas into the tubular gas bladder, causing the tubular gas bladder to expand. This ensures that the tubular inner wall of the gas bladder is always sealed against the surface of the steam-water connection pipe, further guaranteeing the sealing performance between the steam-water connection pipe and the top plate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a sealing structure for a steam-water connection pipe according to the present invention.

[0013] Figure 2 This is a cross-sectional view of a sealing structure for a steam-water connection pipe according to the present invention.

[0014] Icons: 1-Soda / water connection pipe, 2-Support pipe, 3-Heat-resistant sealing filler layer, 4-Tube-type airbag, 5-Gas delivery pipe, 6-Vent pipe, 7-Elastic heat insulation layer, 8-Protective ring, 9-Top protective plate. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] All electrical components involved in this application are prior art. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies can be connected by wires. According to the actual situation, a suitable controller can be selected to meet the control requirements. For specific connections and control sequences, please refer to the description below. The electrical connection between each electrical component is completed in the order of operation. The detailed connection methods are well known in the art. The following mainly introduces the working principle and process, and will not describe the electrical control.

[0017] Example 1 Reference Figure 1 , Figure 2 This utility model discloses a sealing structure for a steam-water connection pipe, including a support pipe 2 surrounding the outer side of the steam-water connection pipe 1. One end of the support pipe 2 is sealed to a top protective plate 9. A heat-resistant sealing filler layer 3 is filled between the inner wall of the end of the support pipe 2 near the top protective plate 9 and the steam-water connection pipe 1. A tubular airbag 4 surrounding the steam-water connection pipe 1 is connected to the inner wall of the end of the support pipe 2 away from the top protective plate 9. The tubular airbag 4 is connected to an air pump for inflating the tubular airbag 4 through an air supply pipe 5, so that the tubular inner wall of the tubular airbag 4 is tightly fitted to the steam-water connection pipe 1. A valve is provided on the air supply pipe 5. The tubular airbag 4 is connected to an accumulator through a vent pipe 6. The accumulator and the air pump can be installed in appropriate positions according to actual conditions.

[0018] In this embodiment, the heat-resistant sealing packing layer 3, while ensuring good sealing performance, also reduces the direct heat transfer from the boiler top plate 9 to the gas bladder, thereby slowing down the aging and damage of the tubular gas bladder 4. The tubular gas bladder 4 is inflated by an air pump, causing its tubular inner wall to fit against the steam-water connection pipe 1. By setting up the tubular gas bladder 4 and the accumulator, when the steam-water connection pipe 1 heats up and expands, it compresses the tubular gas bladder 4, causing the gas in the tubular gas bladder 4 to flow into the accumulator for storage. When the steam-water connection pipe 1 cools down and contracts... When the pressure on the tubular air bladder 4 is stopped, the accumulator releases the stored gas into the tubular air bladder 4, causing it to expand. This ensures that the inner wall of the tubular air bladder 4 remains sealed against the surface of the steam-water connection pipe 1, further guaranteeing the seal between the steam-water connection pipe 1 and the top cover plate 9. Through this structure, the sealing structure of the boiler steam-water connection pipe 1 does not affect the expansion of the steam-water connection pipe 1, and it can also compensate for the cracking and ash leakage problems caused by the expansion difference and the poor resilience of the insulation cotton, greatly improving the sealing performance between the steam-water connection pipe 1 and the boiler top cover plate 9.

[0019] The ability to control the inflation pressure of the tubular airbag 4 when inflating it with an air pump is common knowledge to those skilled in the art.

[0020] Example 2 Based on Example 1, referring to Figure 1 , Figure 2 An elastic heat insulation layer 7 is attached to the outer side of the soda-water connection pipe 1 inside the support pipe 2. By setting the elastic heat insulation layer 7, the temperature on the soda-water connection pipe 1 can be prevented from being directly conducted to the tubular airbag 4, thus slowing down the aging and damage of the tubular airbag 4.

[0021] Specifically, the elastic insulation layer 7 is a ceramic fiber flexible blanket layer; the ceramic fiber flexible blanket layer can be wrapped around the outer periphery of the steam-water connection pipe 1. In this way, while ensuring that the elastic insulation layer 7 has good resilience, it can also make the elastic insulation layer 7 have high temperature resistance and heat insulation. Moreover, the elastic insulation layer 7 can still maintain good tensile strength, toughness and fiber structure during long-term use, which can ensure the reliability of the elastic insulation layer 7.

[0022] Example 3 Based on Example 1, referring to Figure 1 , Figure 2 A protective ring 8 is provided at the end of the support tube 2 away from the top protective plate 9. By setting the protective ring 8, the tubular airbag 4 can be partially blocked, preventing the end of the tubular airbag 4 from being directly exposed to the outside.

[0023] Specifically, the inner diameter of the protective ring 8 is larger than the outer diameter of the steam-water connection pipe 1, and the inner diameter of the protective ring 8 is smaller than the inner diameter of the support pipe 2.

[0024] Example 4 Based on Example 1, the heat-resistant sealing filler layer 3 is a graphite nickel wire sealing filler layer.

[0025] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A sealing structure for a steam-water connection pipe, comprising a support pipe (2) surrounding the outside of a steam-water connection pipe (1), one end of the support pipe (2) being sealed to a top protective plate (9), characterized in that: A heat-resistant sealing filler layer (3) is filled between the inner wall of the support tube (2) near the top guard plate (9) and the steam-water connection tube (1). A tubular airbag (4) is connected to the inner wall of the support tube (2) away from the top guard plate (9) and surrounds the steam-water connection tube (1). The tubular airbag (4) is connected to an air pump for inflating the tubular airbag (4) through an air supply pipe (5) so that the tubular inner wall of the tubular airbag (4) is tightly fitted with the steam-water connection tube (1). A valve is provided on the air supply pipe (5). An accumulator is connected to the tubular airbag (4) through a vent pipe (6).

2. The sealing structure for a steam-water connection pipe according to claim 1, characterized in that: The steam-water connection pipe (1) is placed inside the support pipe (2) and has an elastic heat insulation layer (7) attached to its outer side.

3. The sealing structure for a steam-water connection pipe according to claim 2, characterized in that: The elastic insulation layer (7) is a ceramic fiber flexible blanket layer.

4. The sealing structure for a steam-water connection pipe according to claim 1, characterized in that: A protective ring (8) is provided at one end of the support tube (2) away from the top protective plate (9).

5. The sealing structure for a steam-water connection pipe according to claim 4, characterized in that: The inner diameter of the protective ring (8) is larger than the outer diameter of the steam-water connecting pipe (1), and the inner diameter of the protective ring (8) is smaller than the inner diameter of the support pipe (2).

6. The sealing structure for a steam-water connection pipe according to claim 1, characterized in that: The heat-resistant sealing filler layer (3) is a graphite nickel wire sealing filler layer.

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