An air preheater with high sealing performance

Abstract

The utility model discloses a kind of air preheaters with stronger sealing performance, belong to air preheater technical field, including base, the base upper fixed installation has several supports, and support upper connection installation has air preheater shell, the rotor element is arranged in the air preheater shell inside, and air preheater shell upper is provided with air duct shell, the upper surface of the rotor element is provided with several baffle, and rotor element contains flue gas inlet, primary air inlet and secondary air inlet, the baffle will several heat storage units of rotor element, the baffle upper is installed with sealing sheet, and sealing sheet is located on the baffle upper and constitutes rotating structure, the sealing sheet upper is provided with sealing strip, and sealing strip is slidably connected in the air duct shell bottom. The air preheater with stronger sealing performance has excellent sealing performance and high wear resistance and deformation resistance, sealing structure prevents air leakage, is suitable for the scene such as coal-fired power plant needing efficient air preheater, can improve power generation efficiency, reduce energy loss.

Description

Technical Field

[0001] This utility model relates to the field of air preheater technology, specifically to an air preheater with strong sealing performance. Background Technology

[0002] Air preheaters in coal-fired power plants are key pieces of equipment in plant operation. Their main function is to utilize the waste heat from the flue gas at the boiler tail end to heat the air needed for combustion. Their structure typically includes heating surfaces and rotating parts. During operation, flue gas and air exchange heat through the heating surfaces, increasing the temperature of the air entering the furnace, improving fuel combustion efficiency, reducing exhaust gas temperature, and minimizing heat loss. This not only increases the power plant's generating efficiency but also reduces coal consumption, contributing to energy conservation and emission reduction in coal-fired power plants and ensuring stable power production. They play an indispensable role in the entire power supply system. However, existing air preheaters still have certain problems in use:

[0003] For example, a rotary air preheater flexible sealing structure with application number 202210205525.3 has the following technical solution: it includes a fixing mechanism, an air preheater central cylinder, and a rotor. The rotor is fixedly sleeved on the outside of the air preheater central cylinder. One end of the air preheater central cylinder is used to connect to the high-temperature flue gas emission port, and the other end is used to discharge flue gas. The rotor is provided with several fan-shaped shells that are symmetrical about the center of the air preheater central cylinder. A radially extending screw is connected inside the fan-shaped shell. A radial sealing part that fits and connects to the inner wall of the fan-shaped shell is movably sleeved on the screw. The screw is exposed outside the fan-shaped shell. A second transmission gear is fixedly sleeved on one side of the air preheater, and a first transmission gear is fixedly sleeved on the outside of the air preheater's central cylinder. The drive motor in the fixed mechanism is connected to the drive gear through the motor shaft. The drive gear meshes with the first transmission gear, and the second transmission gear meshes with the fixed housing. However, in the existing air preheater operating system of coal-fired power plants, the air leakage problem has long restricted the efficient and economical operation of the power plant. The traditional air preheater's air leakage sealing structure design has many shortcomings and the sealing technology is not good. Under long-term high temperature, high pressure and complex airflow scouring, it is easy to wear and deform, resulting in an increase in sealing gap and aggravated air leakage.

[0004] In view of this, in-depth research was conducted on the above issues, which led to the creation of this case.

[0005] To address the aforementioned issues, an innovative design was implemented based on the existing air preheater. Utility Model Content

[0006] The purpose of this invention is to provide an air preheater with strong sealing performance to solve the problems of insufficient sealing effect and easy wear in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An air preheater with strong sealing performance includes a base, several supports fixedly installed on the base, and an air preheater shell connected to the supports. A rotating column is connected to the bottom of the air preheater shell. A rotor element is disposed inside the air preheater shell, and an air duct shell is disposed above the air preheater shell. Several baffles are disposed on the upper surface of the rotor element, and the rotor element includes a flue gas inlet, a primary air inlet, and a secondary air inlet. The baffles divide the rotor element into several heat storage units, and several corrugated plates are disposed inside the heat storage units. A sealing plate is installed above the baffle, and the sealing plate is located above the baffle to form a rotating structure. A sealing strip is disposed above the sealing plate and is slidably connected to the bottom of the air duct shell.

[0009] Preferably, the upper edge of the baffle is provided with slots at both ends, and the edge of the sealing sheet at the connection position with the baffle is provided with a slot in the middle.

[0010] The above technical solution includes slots at both ends of the upper edge of the baffle and in the middle of the edge of the sealing plate connection position. The slots provide a certain deformation space between the sealing plate and the baffle. During the operation of the air preheater, when subjected to high temperature, high pressure or airflow scouring, these slots can alleviate stress concentration at the connection between the sealing plate and the baffle, reduce wear and deformation caused by excessive stress, and thus extend the service life of the sealing structure.

[0011] Preferably, the outer edge of the baffle is chamfered, and the edge of the rotating part of the sealing sheet is also chamfered.

[0012] By adopting the above technical solution, the chamfers set on the outer edge of the baffle and the rotating edge of the sealing sheet can reduce the resistance of the airflow when it flows through these edges and reduce the scouring effect of the airflow on the edges. This can not only reduce the wear of the sealing sheet and the edge of the baffle, but also optimize the airflow inside the air preheater, improve the heat exchange efficiency, and further enhance the stability of the sealing structure.

[0013] Preferably, the sealing sheet is connected to the groove of the baffle, and a shaft is hinged between the sealing sheet and the baffle.

[0014] Using the above technical solution, the sealing sheet and the baffle are connected by a groove and hinged to the shaft. This connection method allows the sealing sheet to rotate flexibly. During the rotation of the air preheater rotor element, the sealing sheet can adaptively adjust its angle according to the pressure changes and airflow conditions in different areas, better fit the bottom of the air duct shell, enhance the sealing effect, and effectively reduce air leakage.

[0015] Preferably, a torsion spring is fixedly installed at the inside corner of the connection between the sealing sheet and the baffle, and two torsion springs are provided for each group of sealing sheets and baffles.

[0016] With the above technical solution, a torsion spring is installed at the inside corner of the connection between the sealing sheet and the baffle. The torsion spring can provide continuous elastic force to the sealing sheet. When the air preheater is running, even if the sealing sheet is displaced by external force, the torsion spring can quickly restore it to the optimal sealing position, maintain a good sealing state, and further enhance the reliability of the sealing structure.

[0017] Preferably, a sealing strip is fixedly provided on the top surface of the sealing sheet at the horizontal position of rotation, and the sealing strip is in the shape of a semi-cylinder.

[0018] By adopting the above technical solution, the semi-cylindrical sealing strip, fixed on the top surface of the rotating sealing plate, increases the contact area between the sealing strip and the bottom of the air duct housing, resulting in a tighter contact. This more effectively fills the sealing gap, prevents air leakage, significantly improves the sealing effect, and reduces air leakage losses in the air preheater.

[0019] Preferably, the bottom of the air duct housing is provided with a groove, and the sealing strip is slidably connected inside the groove.

[0020] The above technical solution utilizes a groove at the bottom of the duct housing and a sliding connection between the sealing strip and the groove. The groove guides the movement of the sealing strip. During air preheater operation, the rotation of the rotor components drives the sealing sheet and sealing strip to move. The groove ensures stable sliding of the sealing strip, preventing offset or jamming, ensuring the stability and reliability of the seal, and reducing damage caused by long-term friction.

[0021] Compared with the prior art, the beneficial effects of this utility model are: the air preheater has stronger sealing performance.

[0022] 1. Excellent sealing performance: Through the tight fit between the sealing sheet, sealing strip and bottom of the air duct shell, as well as the elastic force of the torsion spring on the sealing sheet, the air leakage during the operation of the air preheater is greatly reduced, effectively improving the heat exchange efficiency of the air preheater, reducing energy loss and improving the power generation efficiency of the power plant.

[0023] 2. High wear resistance and deformation resistance: The design of the slot and chamfer, as well as the reasonable connection structure, alleviates stress concentration and reduces wear caused by airflow scouring. This allows the sealing structure to remain stable under high temperature, high pressure and complex airflow environments. The sliding connection between the sealing strip and the groove reduces deformation and damage, extending the overall service life of the air preheater. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the front view of the present invention.

[0025] Figure 2 This is a schematic diagram of the air preheater shell structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the sealing sheet structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the rotating structure of the sealing sheet of this utility model;

[0028] Figure 5 This is a schematic diagram of the bottom structure of the air duct shell of this utility model.

[0029] In the diagram: 1. Base; 2. Bracket; 3. Rotary column; 4. Air preheater housing; 5. Rotor element; 6. Duct housing; 7. Flue gas inlet; 8. Primary air inlet; 9. Secondary air inlet; 10. Heat storage unit; 11. Baffle; 12. Sealing plate; 13. Torsion spring; 14. Sealing strip; 15. Slide groove. Detailed Implementation

[0030] 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.

[0031] Please see Figure 1-5 This utility model provides a technical solution:

[0032] An air preheater with strong sealing performance includes a base 1, several brackets 2 are fixedly installed on the base 1, and an air preheater shell 4 is connected and installed on the brackets 2. A rotating column 3 is connected and installed at the bottom of the air preheater shell 4. A rotor element 5 is arranged inside the air preheater shell 4, and an air duct shell 6 is arranged on the top of the air preheater shell 4. Several baffles 11 are arranged on the upper surface of the rotor element 5, and the rotor element 5 includes a flue gas inlet 7, a primary air inlet 8, and a secondary air inlet 9. The baffles 11 divide the rotor element 5 into several heat storage units 10, and several corrugated plates are arranged inside the heat storage units 10. A sealing plate 12 is installed on the top of the baffle 11, and the sealing plate 12 is located above the baffle 11 to form a rotating structure. A sealing strip 14 is arranged on the top of the sealing plate 12, and the sealing strip 14 is slidably connected to the bottom of the air duct shell 6.

[0033] The baffle 11 has slots at both ends of its upper edge, and the sealing sheet 12 has a slot in the middle of its edge where it connects to the baffle 11. The outer edge of the baffle 11 is chamfered, and the rotating edge of the sealing sheet 12 is also chamfered. The sealing sheet 12 connects to the groove of the baffle 11, and a shaft is hinged between the sealing sheet 12 and the baffle 11. The slots on the baffle 11 and the sealing sheet 12 provide buffer space for thermal expansion and contraction or deformation under stress, preventing damage to the sealing structure due to insufficient expansion and contraction, thus enhancing the sealing structure. In terms of adaptability and reliability under complex working conditions, the chamfered edges of the rotating parts of the baffle 11 and the sealing plate 12 can effectively reduce the impact and wear of the airflow on the edges, reduce the wear rate of the sealing components, extend the service life of the sealing plate 12 and the baffle 11, and thus ensure the long-term stable sealing performance of the air preheater. The sealing plate 12 and the baffle 11 are connected by a groove and a shaft, allowing the sealing plate 12 to rotate flexibly, better fit different positions at the bottom of the air duct shell 6, fill the gaps caused by manufacturing errors or operational deformation, improve the tightness of the seal, and effectively reduce air leakage.

[0034] A torsion spring 13 is fixedly installed at the concave corner of the connection between the sealing plate 12 and the baffle 11, and two torsion springs 13 are provided for each set of sealing plate 12 and baffle 11. The torsion springs 13 at the connection between the sealing plate 12 and the baffle 11 provide continuous rebound force for the sealing plate 12. During the operation of the air preheater, when the sealing plate 12 is subjected to external forces such as airflow disturbance, the torsion springs 13 can quickly reset it, always maintaining a good sealing state and enhancing the stability of the seal.

[0035] A sealing strip 14 is fixedly installed on the top surface of the sealing plate 12 at the horizontal position. The sealing strip 14 is semi-cylindrical. A groove 15 is opened at the bottom of the air duct housing 6, and the sealing strip 14 is slidably connected to the inside of the groove 15. Compared with other shapes, the semi-cylindrical sealing strip 14 on the sealing plate 12 can increase the contact area with the bottom of the air duct housing 6, improve the sealing effectiveness, more effectively prevent air leakage, and improve the heat exchange efficiency of the air preheater. The sliding connection between the groove 15 at the bottom of the air duct housing 6 and the sealing strip 14 provides guidance for the movement of the sealing strip 14, ensuring that the sealing strip 14 slides smoothly during the rotation of the rotor element 5, avoiding its deviation or falling off, and ensuring the continuity and reliability of the sealing effect.

[0036] Working principle:

[0037] In use, the high-temperature flue gas at the tail of the boiler enters the heat storage unit 10 of the rotor element 5 from top to bottom through the flue gas inlet 7. The corrugated plate inside the heat storage unit 10 absorbs the heat from the flue gas. At the same time, primary air enters from bottom to top through the primary air inlet 8 and secondary air enters from bottom to top through the secondary air inlet 9. As the rotor element 5 rotates, the heat storage unit 10, having absorbed heat, gradually rotates to the primary and secondary air areas. The heated primary air is sent to the coal mill through the air duct to heat and transport pulverized coal, and the heated secondary air is sent to the burner through the air duct to enter the furnace. It assists in the combustion of pulverized coal, thereby achieving the recycling of heat. In this process, the rotor element 5 is driven to rotate by the rotating column 3. A gear is set on the outside of the rotating column 3. The gear meshes with the gear driven by the external drive motor. The rotor element 5 drives the baffle 11 to rotate counterclockwise. The sealing plate 12 above the baffle 11 rotates with the rotor element 5. Under the action of the torsion spring 13, the sealing plate 12 only rotates and folds to one side, always maintaining a tendency to be tightly fitted to the bottom of the air duct shell 6. When the sealing plate 12 rotates, (as shown in the instruction manual) Figure 3 The image shows the initial position of the sealing sheet 12. After the sealing sheet 12 touches the bottom of the air duct housing 6, as per the instruction manual... Figure 4 (Forming a counterclockwise rotating structure), the sealing strip 14 on its top surface always faces upward and slides in the groove 15 at the bottom of the air duct housing 6 to ensure the stability of the seal. Due to the special connection structure between the sealing strip 12 and the baffle 11 and the design of the slot and chamfer, it can adapt to high temperature, high pressure and airflow scouring, effectively reduce air leakage and ensure the efficient operation of the air preheater.

[0038] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0039] 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. An air preheater with strong sealing performance, comprising a base (1), wherein a plurality of supports (2) are fixedly installed on the base (1), and an air preheater housing (4) is connected and installed on the supports (2), a rotating column (3) is connected and installed at the bottom of the air preheater housing (4), a rotor element (5) is provided inside the air preheater housing (4), and an air duct housing (6) is provided on the top of the air preheater housing (4), characterized in that: The rotor element (5) has several baffles (11) on its upper surface, and the rotor element (5) includes a flue gas inlet (7), a primary air inlet (8) and a secondary air inlet (9). The baffles (11) divide the rotor element (5) into several heat storage units (10), and several corrugated plates are provided inside the heat storage units (10). A sealing plate (12) is installed above the baffles (11), and the sealing plate (12) is located above the baffles (11) to form a rotating structure. A sealing strip (14) is provided above the sealing plate (12), and the sealing strip (14) is slidably connected to the bottom of the air duct shell (6).

2. The air preheater with strong sealing performance according to claim 1, characterized in that: The baffle (11) has slots at both ends of its upper edge, and the sealing sheet (12) has a slot in the middle of the edge where it connects with the baffle (11).

3. An air preheater with strong sealing performance according to claim 2, characterized in that: The outer edge of the baffle (11) is chamfered, and the edge of the rotating part of the sealing sheet (12) is chamfered.

4. An air preheater with strong sealing performance according to claim 3, characterized in that: The sealing sheet (12) is connected to the groove of the baffle (11), and a shaft is hinged between the sealing sheet (12) and the baffle (11).

5. An air preheater with strong sealing performance according to claim 4, characterized in that: A torsion spring (13) is fixedly installed at the inside corner of the connection between the sealing sheet (12) and the baffle (11), and two torsion springs (13) are provided for each group of sealing sheets (12) and baffles (11).

6. An air preheater with strong sealing performance according to claim 1, characterized in that: A sealing strip (14) is fixedly provided on the top surface of the sealing sheet (12) at the horizontal position of rotation, and the sealing strip (14) is a semi-cylinder.

7. An air preheater with strong sealing performance according to claim 1, characterized in that: The bottom of the air duct housing (6) is provided with a groove (15), and the sealing strip (14) is slidably connected to the inside of the groove (15).

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