Expansion joint for desulfurization flue of thermal power plant

Abstract

The utility model relates to the technical field of thermal power plant equipment, and discloses a thermal power plant desulfurization flue expansion joint which comprises flues and an expansion joint body, the flues are fixedly installed at the two ends of the expansion joint body respectively, a fixing cylinder is arranged on the inner wall of the expansion joint body, and a sealing heat insulation layer is arranged between the fixing cylinder and the inner wall of the expansion joint body. The temperature difference compensation device is used for adjusting temperature difference compensation between the expansion joint and the flue. The second sealing ring is matched with the sealant and the flange structure, double sealing of the joint between the expansion joint and the interior and exterior of the flue is achieved, the design of the first heat insulation layer and the second heat insulation layer is combined, the internal temperature difference between the expansion joint and the flue can be prevented from being too large, and therefore condensation of substances such as water vapor and sulfuric acid steam is prevented, sticky substances are reduced, and the ash deposition speed is reduced. Therefore, the service life of the expansion joint is prolonged, the maintenance cost is reduced, and stable operation of a desulfurization flue system is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of thermal power plant equipment technology, specifically to an expansion joint for desulfurization flue gas ducts in thermal power plants. Background Technology

[0002] Currently, most existing desulfurization flue gas expansion joint devices use flange structures to fix them to the desulfurization flue gas, and apply sealant and anti-corrosion coating at the connection to improve the sealing performance of the expansion joint, so as to better extend its service life.

[0003] However, this method of applying sealant to the connection between the expansion joint and the desulfurization flue after installation does not adequately protect the internal connection of the expansion joint. During use, due to factors such as gap adsorption and temperature fluctuations, a relatively large amount of ash accumulates at this point as the flue gas passes through. Furthermore, since this ash layer often contains unburned corrosive substances, its accumulation at the connection between the expansion joint and the desulfurization flue accelerates corrosion at this point. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an expansion joint for desulfurization flue gas ducts in thermal power plants, which solves the problems mentioned in the background.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An expansion joint for desulfurization flue gas in a thermal power plant includes a flue gas and an expansion joint. Flue gas is fixedly installed at both ends of the expansion joint. A fixed cylinder is provided on the inner wall of the expansion joint. A sealing and heat insulation layer is provided between the fixed cylinder and the inner wall of the expansion joint for adjusting the temperature difference compensation between the expansion joint and the flue gas.

[0007] Optionally, the sealing and heat insulation layer includes a heat insulation layer one fixedly installed at the gap between the expansion joint and the fixed cylinder. A sealing ring one is fixedly installed on both sides of the heat insulation layer one. A heat insulation layer two is fixedly installed on the side of each of the two sealing rings one away from the heat insulation layer one. A sealing ring two is fixedly installed on the side of each of the two heat insulation layers two away from the sealing rings one. A dust removal component is detachably installed on the inner wall of the fixed cylinder for cleaning the accumulated dust on the inner wall of the fixed cylinder.

[0008] Optionally, the first heat insulation layer is located inside the expansion joint, the first sealing ring is located at the edge of the inner side of the expansion joint, and the second sealing ring is fixedly installed at the edge of the fixed cylinder.

[0009] Optionally, the dust removal assembly includes a mounting ring detachably installed on the inner wall of the fixed cylinder. A fixing rod is provided in the middle of the mounting ring. A connecting bracket is installed between the fixing rod and the mounting ring. A rotating block is rotatably installed at the bottom of the fixing rod. Multiple rotating blades are fixedly installed on the outer periphery of the rotating block. A connecting rod is fixedly installed on the lower surface of one of the rotating blades. A cleaning strip is fixedly installed at the end of the connecting rod away from the rotating blade.

[0010] Optionally, the cleaning strip is made of a high-temperature resistant, deformable, flexible material, and a counterweight is fixedly installed at the bottom of the cleaning strip away from the connecting rod. The weight of the cleaning strip is less than the weight of the counterweight, and the cleaning strip is perpendicular to the inner wall of the fixed cylinder when stationary.

[0011] Optionally, three rotating blades are provided, and the three rotating blades are arranged in an array with the center of the rotating block as the reference.

[0012] This utility model provides an expansion joint for desulfurization flue gas ducts in thermal power plants, which has the following advantages compared with the prior art:

[0013] By using sealing ring two in conjunction with sealant and flange structure, a double seal is achieved at the connection between the expansion joint and the inside and outside of the flue. In addition, the design of insulation layer one and insulation layer two can avoid excessive internal temperature difference between the expansion joint and the flue, thereby preventing the condensation of water vapor, sulfuric acid vapor and other substances, reducing the formation of sticky substances, slowing down the ash accumulation rate, extending the service life of the expansion joint, reducing maintenance costs, and ensuring the stable operation of the desulfurization flue system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the sealing and heat insulation layer of this utility model;

[0016] Figure 3 This is a cross-sectional view of the fixing cylinder of this utility model;

[0017] Figure 4 This utility model Figure 3 A magnified structural diagram of point A in the middle.

[0018] In the diagram: 1. Flue; 2. Expansion joint; 3. Fixed cylinder; 4. Insulation layer one; 5. Sealing ring one; 6. Insulation layer two; 7. Sealing ring two; 8. Mounting ring; 9. Fixed rod; 10. Connecting bracket; 11. Rotating block; 12. Rotating blade; 13. Connecting rod; 14. Cleaning strip; 15. Counterweight. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 and Figure 2 This utility model provides a technical solution: an expansion joint for desulfurization flue gas in thermal power plants, including a flue gas 1 and an expansion joint 2. Flue gas 1 is fixedly installed at both ends of the expansion joint 2. A fixing cylinder 3 is provided on the inner wall of the expansion joint 2. A sealing and heat insulation layer is provided between the fixing cylinder 3 and the inner wall of the expansion joint 2 for adjusting the temperature difference compensation between the expansion joint 2 and the flue gas 1.

[0021] Furthermore, the sealing and heat insulation layer includes a heat insulation layer 4 fixedly installed at the gap between the expansion joint 2 and the fixed cylinder 3. A sealing ring 5 is fixedly installed on both sides of the heat insulation layer 4. A heat insulation layer 6 is fixedly installed on the side of the two sealing rings 5 ​​away from the heat insulation layer 4. A sealing ring 7 is fixedly installed on the side of the two heat insulation layers 6 away from the sealing rings 5. A dust removal component is detachably installed on the inner wall of the fixed cylinder 3 for cleaning the accumulated dust on the inner wall of the fixed cylinder 3.

[0022] Furthermore, the insulation layer 4 is located inside the expansion joint 2, the sealing ring 5 is located at the edge of the inner side of the expansion joint 2, and the sealing ring 7 is fixedly installed at the edge of the fixed cylinder 3.

[0023] In this embodiment, sealant can be applied to the outer periphery of the sealing ring 2 7 beforehand. Then, the two sealing rings 2 7 on the expansion joint 2 are inserted into the flue 1 respectively. After keeping the position between the expansion joint 2 and the flue 1 in a vertical direction, the two can be fixed by the flange structure at the connection between the expansion joint 2 and the flue 1. Sealant is then applied to the connection between the expansion joint 2 and the outside of the flue 1. By inserting the sealing ring 2 7 into the flue 1 and using the sealant to adhere to the inner wall of the flue 1, the internal connection between the expansion joint 2 and the flue 1 can be sealed. Furthermore, the design of the heat insulation layer 1 4 and the heat insulation layer 2 6 can prevent the temperature difference between the inside of the expansion joint 2 and the inside of the flue 1 from being too large, thereby preventing water vapor, sulfuric acid vapor, etc. in the flue gas from condensing on its surface, reducing the situation where the flue gas forms a sticky substance with the condensed substance when passing through the expansion joint 2, and reducing the ash accumulation rate.

[0024] Please see Figure 3 and Figure 4The present invention provides a technical solution: further, the dust removal component includes a mounting ring 8 detachably installed on the inner wall of the fixed cylinder 3, a fixing rod 9 is provided in the middle of the mounting ring 8, a connecting bracket 10 is installed between the fixing rod 9 and the mounting ring 8, a rotating block 11 is rotatably installed at the bottom of the fixing rod 9, a plurality of rotating blades 12 are fixedly installed on the outer periphery of the rotating block 11, a connecting rod 13 is fixedly installed on the lower surface of one of the rotating blades 12, and a cleaning strip 14 is fixedly installed at the end of the connecting rod 13 away from the rotating blade 12.

[0025] In this embodiment, when the expansion joint 2 is in a vertically installed state, the cleaning strip 14 will be vertically downward under the influence of the gravity of the counterweight 15. When the desulfurization flue is working, the flue gas acts upward on the surface of the rotating blade 12. The rotating blade 12 generates a torque to push it to rotate under the action of the airflow, thereby driving the cleaning strip 14 on the surface of the connecting rod 13 on the rotating blade 12 to rotate. Under the action of centrifugal force, the cleaning strip 14 will spirally rotate with the running direction of the rotating blade 12, so that the flexible material of the cleaning strip 14 and the inner wall of the fixed cylinder 3 are in continuous contact during the movement, and the scraping action of the spiral motion effectively peels off the ash particles.

[0026] Furthermore, the cleaning strip 14 is made of a high-temperature resistant, deformable, flexible material. A counterweight 15 is fixedly installed at the bottom of the cleaning strip 14 away from the connecting rod 13. The weight of the cleaning strip 14 is less than the weight of the counterweight 15. When the cleaning strip 14 is stationary, it is perpendicular to the inner wall of the fixed cylinder 3. When the desulfurization flue stops running, the cleaning strip 14 will return to a vertical downward state under the influence of the counterweight 15. It can also gravity-dislodge and clean the ash adhering to its surface. At the same time, the downward state of the counterweight 15 can keep the cleaning strip 14 in a stretched shape, preparing it for the cleaning operation when it is started up again.

[0027] Furthermore, there are three rotating blades 12, which are arranged in an array with the center of the rotating block 11 as the reference.

[0028] Working principle: When using the expansion joint for the desulfurization flue of this thermal power plant, sealant can be applied to the outer circumference of the sealing ring 7 beforehand. Then, the two sealing rings 7 on both ends of the expansion joint 2 are inserted into the flue 1 respectively. After ensuring that the position between the expansion joint 2 and the flue 1 is vertical, they can be fixed together by the flange structure at the connection between the expansion joint 2 and the flue 1. After applying sealant to the connection between the expansion joint 2 and the outside of the flue 1, the sealing ring 7 is inserted into the flue 1 and adhered to the inner wall of the flue 1 by the sealant. This method can seal the interior of the expansion joint 2 and the flue 1. The joints are sealed, and the design of insulation layer 4 and insulation layer 6 can prevent the temperature difference between the inside of expansion joint 2 and the inside of flue 1 from being too large. This prevents water vapor, sulfuric acid vapor, etc. in the flue gas from condensing on its surface, reduces the formation of sticky substances when the flue gas passes through expansion joint 2, reduces the ash accumulation rate, and thus effectively extends the service life of expansion joint 2. It also reduces the frequency and cost of maintenance caused by excessive ash accumulation, while ensuring the stability and smooth operation of the desulfurization flue system, enabling the entire thermal power plant desulfurization process to operate more efficiently and continuously.

[0029] It is worth mentioning that, although the expansion joint 2 and the flue 1 are insulated to prevent excessive temperature difference and steam condensation, the expansion joint 2 inevitably accumulates relatively more ash due to temperature fluctuations and other factors when the flue gas passes through it. Therefore, the cleaning strip 14 can be designed to clean the ash accumulated on the inner wall of the expansion joint 2 when it is installed vertically. When the expansion joint 2 is installed vertically, the cleaning strip 14 will be vertically downward under the influence of the weight of the counterweight 15. When the desulfurization flue is working, the flue gas acts upward on the surface of the rotating blade 12. The rotating blade 12 generates a torque to push it to rotate under the action of the airflow, thereby driving the cleaning strip 14 on the surface of the connecting rod 13 on the rotating blade 12 to rotate. Under the action of centrifugal force, the cleaning strip 14 will rotate with the rotating blade 12. The cleaning strip 14 rotates in a spiral direction, allowing the flexible material of the cleaning strip 14 to continuously contact the inner wall of the fixed cylinder 3. Through the scraping action of the spiral motion, the accumulated ash particles are effectively removed. The rotating blade 12 drives the cleaning strip 14 to rotate for cleaning. Because the whole system is lightweight, it is easy for the flue gas to drive the cleaning strip 14 on the rotating blade 12. In addition, when the desulfurization flue stops operating, the cleaning strip 14 will return to a vertical downward position under the influence of the counterweight 15, and the accumulated ash on its surface can also be gravity-driven off and cleaned. At the same time, the downward position of the counterweight 15 can keep the cleaning strip 14 in an extended shape, preparing it for the cleaning operation when it starts up again. This forms an automated ash cleaning cycle mechanism, reduces the frequency of manual intervention, and improves the operation and maintenance convenience of the desulfurization flue system.

[0030] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermal power plant desulfurization flue expansion joint, comprising a flue (1) and an expansion joint (2), both ends of the expansion joint (2) are fixedly installed with the flue (1), characterized in that: The inner wall of the expansion joint (2) is provided with a fixed cylinder (3), and a sealing and heat insulation layer is provided between the fixed cylinder (3) and the inner wall of the expansion joint (2) for adjusting the temperature difference compensation between the expansion joint (2) and the flue (1).

2. The power plant desulphurization stack expansion joint of claim 1, wherein: The sealing and heat insulation layer includes a heat insulation layer one (4) fixedly installed at the gap between the expansion joint (2) and the fixed cylinder (3). A sealing ring one (5) is fixedly installed on both sides of the heat insulation layer one (4). A heat insulation layer two (6) is fixedly installed on the side of the two sealing rings one (5) away from the heat insulation layer one (4). A sealing ring two (7) is fixedly installed on the side of the two heat insulation layers two (6) away from the sealing rings one (5). A dust removal component is detachably installed on the inner wall of the fixed cylinder (3) for cleaning the dust accumulated on the inner wall of the fixed cylinder (3).

3. The power plant desulphurization stack expansion joint of claim 2, wherein: The first heat insulation layer (4) is located inside the expansion joint (2), the first sealing ring (5) is located at the edge of the inner side of the expansion joint (2), and the second sealing ring (7) is fixedly installed at the edge of the fixed cylinder (3).

4. The power plant desulfurization stack expansion joint of claim 2, wherein: The dust removal assembly includes a mounting ring (8) that is detachably installed on the inner wall of the fixed cylinder (3). A fixing rod (9) is provided in the middle of the mounting ring (8). A connecting bracket (10) is installed between the fixing rod (9) and the mounting ring (8). A rotating block (11) is rotatably installed at the bottom of the fixing rod (9). Multiple rotating blades (12) are fixedly installed on the outer periphery of the rotating block (11). A connecting rod (13) is fixedly installed on the lower surface of one of the rotating blades (12). A cleaning strip (14) is fixedly installed at the end of the connecting rod (13) away from the rotating blade (12).

5. The power plant desulfurization stack expansion joint of claim 4, wherein: The cleaning strip (14) is made of a high-temperature resistant, deformable, flexible material. A counterweight (15) is fixedly installed at the bottom of the cleaning strip (14) away from the connecting rod (13). The weight of the cleaning strip (14) is less than the weight of the counterweight (15). The cleaning strip (14) is perpendicular to the inner wall of the fixed cylinder (3) when it is stationary.

6. The power plant desulfurization stack expansion joint of claim 4, wherein: There are three rotating blades (12), and the three rotating blades (12) are arranged in an array with the center of the rotating block (11) as the reference.

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