Axial sealing device of air preheater

Abstract

The utility model discloses an axial sealing device of an air preheater, and belongs to the technical field of sealing devices of air preheaters. The air preheater rotor sealing structure comprises an air preheater rotor, fan-shaped bins are arranged in the air preheater rotor, the air preheater rotor sealing structure further comprises bolts, nuts, two outer sealing boxes and axial sealing pieces, the two outer sealing boxes are correspondingly arranged on the two sides of the air preheater rotor respectively, the bolt and the nut are arranged on the outer sealing box on each side and used for adjusting the position of the bolt on the outer sealing box, and the axial sealing pieces are arranged on the two sides of the air preheater rotor. One side of the axial sealing piece is fixedly connected with one end of the bolt, the other side of the axial sealing piece is connected with the air preheater rotor in a sliding mode, one side, between the two outer sealing boxes, of the air preheater rotor is an air side, and the other side, between the two outer sealing boxes, of the air preheater rotor is a smoke side. By means of good sealing, air leakage can be effectively reduced, the energy utilization efficiency is improved, the operation cost is reduced, and meanwhile pollution to the environment is reduced.

Description

Technical Field

[0001] The utility model relates to an axial sealing device for an air preheater, belonging to the technical field of sealing devices for air preheaters. Background Art

[0002] The axial seal of the air preheater is an important part of the air preheater. The axial seal prevents air from leaking into the gap between the outer cylinder of the rotor and the shell of the air preheater, and leaking into the flue gas side to cause air leakage in the air preheater. The axial seal is mainly composed of an axial sealing sheet and an arc plate (axial sealing plate). Three arc-shaped axial sealing plates are installed on the shell of the air preheater corresponding to the arc plate. The arc-shaped axial sealing plates are fixed to the shell of the air preheater through a bracket, an angle plate and an adjustment device. The axial sealing gap can be adjusted through the adjustment device.

[0003] The disadvantages of existing axial seals are: 1. Limited sealing effect: Due to the limitations of structure and operating conditions, it is difficult to completely prevent the leakage of air and flue gas, resulting in reduced thermal efficiency. 2. Wear problem: During operation, the sealing components are prone to wear, which reduces the sealing performance, and the maintenance and replacement costs after wear are high. 3. Poor adaptability: For thermal deformation, vibration and other conditions during the operation of the air preheater, the adaptability of the existing axial seals is weak, and sealing failure is prone to occur. 4. Difficult adjustment: Once the installation is completed, the subsequent adjustment of the sealing gap is more complicated, and it is difficult to achieve accurate and timely optimization. 5. High maintenance cost: In order to maintain a certain sealing effect, frequent inspection and maintenance are required, which increases manpower and material costs. 6. High requirements for installation accuracy: If the accurate axial position and gap control cannot be guaranteed during installation, it will directly affect the sealing effect.

[0004] like Figure 1 As shown, the axial seal of the existing air preheater is that the axial sealing sheet is installed on the rotor. The axial sealing sheet rotates with the rotor and rubs against the arc plate to form a sealing structure. Because the arc plate is fixed in position, it is not easy to adjust the distance from the rotor. Because the arc plate cannot cover the entire circle of the rotor, the width is usually less than 3 meters. In order to achieve the sealing effect, the axial sealing sheet needs to be installed on the entire circle of the rotor. Summary of the invention

[0005] The purpose of the utility model is to solve the problems existing in the prior art and further provide an axial sealing device for an air preheater.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] An axial sealing device for an air preheater comprises an air preheater rotor, a fan-shaped compartment is arranged in the air preheater rotor, bolts, nuts, two outer sealing boxes and axial sealing sheets, the two outer sealing boxes are respectively arranged on both sides of the air preheater rotor, bolts are arranged on the outer sealing box on each side, and the nuts are used to adjust the position of the bolts on the outer sealing boxes, one side of the axial sealing sheet is fixedly connected to one end of the bolt, and the other side of the axial sealing sheet is slidably connected to the air preheater rotor, one side of the air preheater rotor between the two outer sealing boxes is the air side, and the other side of the air preheater rotor between the two outer sealing boxes is the flue gas side.

[0008] The diameter of the bolt is 48mm.

[0009] The thickness of the iron plate of the outer sealing box is 10mm.

[0010] Twelve axial sealing sheets are respectively installed on each outer sealing box.

[0011] Beneficial effects of the utility model:

[0012] 1. The effective sealing area of ​​the original axial sealing is the overlapped position of the arc plate and the axial sealing sheet. After the axial sealing of the utility model, the sealing area is the same as that of the prior art, but the number of sealing sheets at the original arc plate position is increased, the spacing between the sealing sheets is reduced, and the overall sealing effect is better.

[0013] 2. Since the axial sealing sheet is not installed on the rotor but at the original arc plate position, the axial sealing sheet can be extended up and down to directly connect the cold and hot end fan plates, eliminating air leakage between the original fan plate and the arc plate.

[0014] 3. Reduce costs: The original single air preheater has 48 axial sealing pieces, while the utility model only needs 24 pieces; the original curved plate is eliminated. The original curved plate processing and manufacturing usually requires the use of wear-resistant and high-temperature resistant materials. When installing, it is necessary to ensure that its position is accurate and it cooperates well with other components to achieve an effective sealing effect. During operation, it is necessary to regularly check the wear and deformation of the curved plate, and repair or replace it in time, which has high use and maintenance costs;

[0015] 4. Increase equipment stability: The original arc plate is difficult to adjust and easy to get stuck; now long screws are used to directly adjust the sealing position of the axial sealing plate, which can adjust the sealing gap more finely and simply, thereby improving the safety of equipment operation.

[0016] The significance of the utility model axial seal:

[0017] 1. Improve thermal efficiency: Reducing air leakage can enable more heat to be effectively utilized, thereby improving the heat exchange efficiency of the air preheater and further improving the energy efficiency of the entire system.

[0018] 2. Energy saving: Improved sealing performance can reduce energy consumption, make more effective use of fuel, achieve energy saving, and help reduce the energy costs of enterprises.

[0019] 3. Increase equipment operation stability: Good sealing can reduce pressure and temperature fluctuations caused by air leakage, reduce the instability of equipment operation, and reduce the probability of failure.

[0020] 4. Extend the service life of equipment: reduce low-temperature corrosion and wear caused by air leakage, reduce damage to equipment, thereby extending the service life of the air preheater and reducing the frequency of equipment maintenance and replacement.

[0021] 5. Reduce environmental pollution: Improve combustion efficiency, make fuel burn more completely, reduce the emission of harmful gases, and reduce environmental pollution.

[0022] 6. Improve economic benefits: By saving energy, reducing maintenance costs and improving equipment operating efficiency, it can bring significant economic benefits to the enterprise and enhance the company's market competitiveness.

[0023] 7. Complying with the requirements of energy conservation and emission reduction will help enterprises achieve sustainable development and establish a good social image. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the structure of the axial sealing device of the existing air preheater.

[0025] Figure 2 It is a structural schematic diagram of the axial sealing device of the air preheater of the utility model.

[0026] Figure 3 for Figure 2 AA section view.

[0027] Figure 4 for Figure 2 (Upper right corner) A partial enlargement of the image.

[0028] The reference numerals in the figure are: 1 for a bolt, 2 for a nut, 3 for an outer sealing box, 4 for an axial sealing plate, 5 for an air preheater rotor, 6 for a fan-shaped compartment, 7 for an air side (wind side), 8 for a flue gas side, and 11 for an arc plate. DETAILED DESCRIPTION

[0029] The utility model will be further described in detail below in conjunction with the accompanying drawings: This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method is given, but the protection scope of the utility model is not limited to the following embodiments.

[0030] like Figure 2 to Figure 4As shown, an axial sealing device of an air preheater in this embodiment is composed of a bolt 1, a nut 2, two outer sealing boxes 3, an axial sealing sheet 4, an air preheater rotor 5 and a fan-shaped compartment 6. The two outer sealing boxes 3 are correspondingly arranged on both sides of the air preheater rotor 5. The outer sealing box 3 on each side is provided with a bolt 1. The nut 2 is used to adjust the position of the bolt 1 on the outer sealing box 3. One side of the axial sealing sheet 4 is welded and fixed to one end of the bolt 1, and the other side of the axial sealing sheet 4 is slidingly connected (frictionally connected) to the air preheater rotor 5. One side of the air preheater rotor 5 between the two outer sealing boxes 3 is an air side 7, and the other side of the air preheater rotor 5 between the two outer sealing boxes 3 is a flue gas side 8. A fan-shaped compartment 6 is provided in the air preheater rotor 5.

[0031] In this embodiment:

[0032] Bolt 1: A long bolt (diameter 48 mm) is used to adjust the position of the sealing piece 4.

[0033] Nut 2: Fix nut 2 on the bolts 1 on both sides of the iron plate of the outer sealing box 3, and adjust the position of the sealing sheet 4 through the long bolts.

[0034] Outer sealing box 3: Use 10mm thick iron plate to weld into a square box at the position of the original arc plate 11 to facilitate bolt adjustment of the sealing piece position.

[0035] Axial sealing piece 4: The axial sealing piece 4 is made of carbon steel and installed (welded) on one end of the bolt 1.

[0036] Air preheater rotor 5: usually cylindrical, composed of multiple compartments. Heat transfer elements, such as corrugated plates or flat plates, are installed in these compartments. When working, the rotor rotates slowly, so that the heat transfer elements alternately pass through the flue gas side and the air side, thereby achieving heat exchange between the flue gas and the air (the air preheater rotor is a prior art).

[0037] Sector-shaped cells 6: The (rotary) air preheater rotor 5 is divided into several sector-shaped cells, which are called compartments. The compartments are filled with heat storage plates made of corrugated metal sheets. In a rotary air preheater, when the rotor rotates slowly, the heat storage plates in the compartments alternately pass through the flue gas side and the air side, thereby achieving heat exchange between the flue gas and the air (sector-shaped cells are prior art).

[0038] Air side 7 (wind side): The wind side of the air preheater generally refers to the side where the air circulates. In a rotary air preheater, the wind side can be divided into the primary air side and the secondary air side.

[0039] Flue gas side 8: The flue gas side of the air preheater refers to the side through which the medium flowing is flue gas.

[0040] In this embodiment, the axial sealing sheet is installed at the original arc plate position to separate the smoke side and the air side of the rotor. Twelve axial sealing sheets 4 are installed on each outer sealing box 3. The position of the sealing sheet is adjusted by long bolts, and the axial sealing sheets can be adjusted individually.

[0041] The above are only preferred specific embodiments of the present invention. These specific embodiments are different implementations based on the overall concept of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An axial sealing device for an air preheater, comprising an air preheater rotor (5), wherein a fan-shaped compartment (6) is provided inside the air preheater rotor (5), characterized in that: It also includes bolts (1), nuts (2), two outer sealing boxes (3) and an axial sealing sheet (4); the two outer sealing boxes (3) are respectively arranged on both sides of the air preheater rotor (5); a bolt (1) is arranged on the outer sealing box (3) on each side; the nut (2) is used to adjust the position of the bolt (1) on the outer sealing box (3); one side of the axial sealing sheet (4) is fixedly connected to one end of the bolt (1); the other side of the axial sealing sheet (4) is slidably connected to the air preheater rotor (5); one side of the air preheater rotor (5) between the two outer sealing boxes (3) is an air side (7); and the other side of the air preheater rotor (5) between the two outer sealing boxes (3) is a flue gas side (8).

2. The axial sealing device of the air preheater according to claim 1, characterized in that: The diameter of the bolt (1) is 48 mm.

3. The axial sealing device of the air preheater according to claim 1, characterized in that: The thickness of the iron plate of the outer sealing box (3) is 10 mm.

4. The axial sealing device of the air preheater according to claim 1, characterized in that: Twelve axial sealing sheets (4) are respectively installed on each outer sealing box (3).

Images