An air preheating device for a thermal power plant

Abstract

The utility model provides a kind of thermal power plant air preheating device, it is related to air preheater technical field, and it includes: base, two symmetrical supports beams of being fixedly connected with being arranged on base top, top seat is fixedly installed between the top of two support beams, shell is fixedly installed between the opposite side of base and top seat, rotor is equipped in shell interior.This kind of air preheating device is made of corrosion -resistant steel plate by axial sealing sheet, radial sealing sheet and axial three-pronged sealing sheet, radial three-pronged sealing sheet constitutes multiple collaborative sealing structure, forms efficient sealing barrier when rotor rotates, and the pressure difference of sealing place is reduced by half, to greatly reduce air leakage rate, directly improve boiler heat exchange efficiency and reduce fan energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of air preheater technology, specifically an air preheating device for thermal power plants. Background Technology

[0002] In thermal power plants, air preheaters are crucial waste heat recovery devices in boiler systems. Their core function is to utilize the waste heat from the flue gas at the boiler's tail end to heat the combustion air entering the boiler. This process significantly reduces exhaust gas temperature and improves boiler thermal efficiency, thereby effectively enhancing the overall economic efficiency of the power plant. Currently, large thermal power generating units commonly use rotary air preheaters, which offer advantages such as compact structure and large heat exchange area.

[0003] The gaps between the moving and stationary parts of the rotary air preheater can lead to serious air leakage problems under the influence of flue gas pressure difference and air pressure difference. The high air leakage rate not only increases the load and power consumption of the induced draft fan and forced draft fan, but also leads to insufficient air supply to the boiler, affecting combustion efficiency and increasing the exhaust volume, resulting in additional heat loss. Utility Model Content

[0004] The purpose of this application is to provide an air preheating device for thermal power plants to solve the technical problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide an air preheating device for a thermal power plant, comprising: a base, two symmetrically arranged support beams fixedly connected to the top of the base, a top seat fixedly installed between the tops of the two support beams, and a housing fixedly installed between the base and the opposite side of the top seat, wherein a rotor is provided inside the housing;

[0006] The rotor is fixedly connected to a number of equally spaced mounting plates. An axial sealing plate is provided on one side of each mounting plate. An axial three-pronged sealing plate is provided on one side every other axial sealing plate. A matching radial sealing plate is provided on one side of the top of the rotor. A radial three-pronged sealing plate is provided on one side every other radial sealing plate.

[0007] Furthermore, the mounting plate and the rotor are respectively provided with multiple straight grooves, the axial sealing plate and the radial sealing plate are each provided with mounting holes a corresponding to the straight grooves, and the axial three-pronged sealing plate and the radial three-pronged sealing plate are each provided with mounting holes b that are used in conjunction with mounting holes a.

[0008] Furthermore, each of the straight grooves is equipped with bolts, and each bolt is threaded with two nuts.

[0009] Furthermore, a compressed gas injection cylinder a and a high-pressure liquid injection pipe are fixedly installed on the top seat, and a compressed gas injection cylinder b is fixedly installed on the base at the same position as the compressed gas injection cylinder a. Each of the compressed gas injection cylinder a, the high-pressure liquid injection pipe and the compressed gas injection cylinder b is provided with a quick connector at one end.

[0010] Furthermore, the compressed gas injection cylinder b and the compressed gas injection cylinder a are arranged opposite to each other, and the compressed gas injection cylinder a, the high-pressure liquid injection pipe and the compressed gas injection cylinder b are arranged horizontally with the rotor.

[0011] Furthermore, a lower beam is fixedly connected to the top of the base, and an upper beam is connected to the bottom of the top seat.

[0012] Furthermore, a guide bearing is fixedly installed at the bottom of the upper beam, and a push bearing is fixedly installed at the top of the lower beam. The rotor is rotatably connected between the guide bearing and the push bearing.

[0013] The beneficial effects of this utility model are:

[0014] The advantage of this invention is that it forms a multi-layered synergistic sealing structure by using axial sealing plates, radial sealing plates, axial triangular sealing plates, and radial triangular sealing plates made of corrosion-resistant steel plates. This creates a highly efficient sealing barrier when the rotor rotates, reducing the pressure difference at the seal by half, thereby significantly reducing the air leakage rate, directly improving the boiler heat exchange efficiency, and reducing the fan energy consumption. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the rotor structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the mounting plate structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the base structure of this utility model.

[0021] Figure 6 For the present utility model Figure 3 Enlarged view of point A in the middle.

[0022] The following are the labeling elements in the figure:

[0023] 1. Base; 11. Support beam; 12. Top seat; 13. Housing; 14. Rotor; 2. Mounting plate; 21. Axial sealing plate; 22. Axial three-pronged sealing plate; 23. Radial sealing plate; 24. Radial three-pronged sealing plate; 3. Straight groove; 31. Mounting hole a; 32. Mounting hole b; 33. Bolt; 34. Nut; 4. Compressed gas injection tube a; 41. High-pressure liquid injection pipe; 42. Compressed gas injection tube b; 43. Quick connector; 5. Lower beam; 51. Upper beam; 52. Guide bearing; 53. Push bearing. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] As attached Figures 1 to 6 The air preheating device for a thermal power plant shown includes: a base 1, two symmetrically arranged support beams 11 fixedly connected to the top of the base 1, a top seat 12 fixedly installed between the tops of the two support beams 11, and a housing 13 fixedly installed between the base 1 and the opposite side of the top seat 12, with a rotor 14 inside the housing 13.

[0027] A number of equally spaced mounting plates 2 are fixedly connected to the outside of the rotor 14. An axial sealing plate 21 is provided on one side of the mounting plate 2. An axial three-pronged sealing plate 22 is provided on one side every other axial sealing plate 21. A matching radial sealing plate 23 is provided on one side of the top of the rotor 14. A radial three-pronged sealing plate 24 is provided on one side every other radial sealing plate 23.

[0028] When the rotor 14 rotates, the mounting plate 2 drives the axial sealing plate 21 and the radial sealing plate 23 to rotate together. The axial sealing plate 21 and the radial sealing plate 23 seal the axial and radial connections with the housing 13. In addition, the axial three-pronged sealing plate 22 and the radial three-pronged sealing plate 24 form a seal, which can reduce the pressure difference at the seal by half, thereby reducing air leakage. The axial sealing plate 21, the axial three-pronged sealing plate 22, the radial sealing plate 23 and the radial three-pronged sealing plate 24 are all made of corrosion-resistant steel plate.

[0029] In a preferred embodiment, the mounting plate 2 and the rotor 14 are respectively provided with a plurality of straight grooves 3. The axial sealing plate 21 and the radial sealing plate 23 are each provided with mounting holes a31 corresponding to the straight grooves 3. The axial triangular sealing plate 22 and the radial triangular sealing plate 24 are each provided with mounting holes b32 that are used in conjunction with the mounting holes a31. Bolts 33 are provided inside the straight grooves 3, and two nuts 34 are threadedly connected to each bolt 33.

[0030] Furthermore, when it is necessary to adjust the distance between the axial sealing plate 21 and the radial sealing plate 23 and the housing 13, first tighten the two nuts 34 to release the fixation of the axial sealing plate 21 and the radial sealing plate 23. Then adjust the position of the axial sealing plate 21 and the radial sealing plate 23, which will drive the bolt 33 to move along the straight groove 3. At the same time, it will also drive the axial three-pronged sealing plate 22 and the radial three-pronged sealing plate 24 to move together. After the adjustment is completed, tighten the nuts 34 to fix them. The axial three-pronged sealing plate 22 and the radial three-pronged sealing plate 24 are separated by the nuts 34, so that there is a gap between the axial sealing plate 21 and the radial sealing plate 23.

[0031] As attached Figures 1 to 6 As shown, a compressed gas injection cylinder a4 and a high-pressure liquid injection pipe 41 are fixedly installed on the top seat 12. A compressed gas injection cylinder b42 is fixedly installed on the base 1 at the same position as the compressed gas injection cylinder a4. One end of the compressed gas injection cylinder a4, the high-pressure liquid injection pipe 41 and the compressed gas injection cylinder b42 are all provided with quick connectors 43. The compressed gas injection cylinder b42 and the compressed gas injection cylinder a4 are arranged opposite to each other, and the compressed gas injection cylinder a4, the high-pressure liquid injection pipe 41 and the compressed gas injection cylinder b42 are arranged horizontally with the rotor 14.

[0032] Specifically: When cleaning the dust on the rotor 14, the external high-pressure gas delivery pipe is connected to the compressed gas injection cylinders a4 and b42 via quick connector 43, and the high-pressure liquid delivery pipe is connected to the high-pressure liquid injection pipe 41 via quick connector 43. After opening the valve of the control switch, compressed gas is sprayed out from the compressed gas injection cylinders a4 and b42. The opposing compressed gas blows the dust off the rotor 14. Combined with the high-pressure liquid flushing of the rotor 14, the dust is washed off and dust is suppressed, causing the dust to fall downwards.

[0033] In a preferred embodiment, a lower beam 5 is fixedly connected to the top of the base 1, an upper beam 51 is connected to the bottom of the top seat 12, a guide bearing 52 is fixedly installed at the bottom of the upper beam 51, a push bearing 53 is fixedly installed at the top of the lower beam 5, and the rotor 14 is rotatably connected between the guide bearing 52 and the push bearing 53.

[0034] Furthermore, the rotor 14 is supported by the upper beam 51 and the lower beam 5. The guide bearing 52 is a double-row radial spherical roller bearing, with the inner ring fixed on the upper shaft sleeve and the outer ring fixed on the guide bearing housing. The upper shaft sleeve is held in place by a locking disc. The entire upper shaft sleeve and guide bearing housing move accordingly with the thermal expansion of the preheater main shaft. The guide bearing housing can move axially within the guide bearing housing. The thrust bearing 53 is a thrust radial spherical roller bearing, with the inner ring fixed to the lower shaft by a coaxial positioning plate and the outer ring resting on the thrust bearing housing. The thrust bearing housing is supported on the bottom plate of the lower beam by upper and lower pads.

[0035] All electrical components mentioned in the text are electrically connected to the main controller and power supply. The main controller can be a conventional known device such as a computer that performs control functions, and the existing publicly available power connection technologies are not described in detail in the text.

[0036] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An air preheating device for a thermal power plant, characterized in that, include: The base (1) has two symmetrically arranged support beams (11) fixedly connected to its top. A top seat (12) is fixedly installed between the tops of the two support beams (11). A housing (13) is fixedly installed between the base (1) and the top seat (12) on opposite sides. A rotor (14) is provided inside the housing (13). The rotor (14) is fixedly connected to a number of equally spaced mounting plates (2). An axial sealing plate (21) is provided on one side of the mounting plate (2). An axial triangular sealing plate (22) is provided on one side of each axial sealing plate (21). A matching radial sealing plate (23) is provided on one side of the top of the rotor (14). A radial triangular sealing plate (24) is provided on one side of each radial sealing plate (23).

2. The air preheating device for thermal power plants according to claim 1, characterized in that, The mounting plate (2) and the rotor (14) are respectively provided with a plurality of straight grooves (3). The axial sealing plate (21) and the radial sealing plate (23) are each provided with mounting holes a (31) corresponding to the straight grooves (3). The axial triangular sealing plate (22) and the radial triangular sealing plate (24) are each provided with mounting holes b (32) that are used in conjunction with mounting holes a (31).

3. The air preheating device for thermal power plants according to claim 2, characterized in that, Each of the straight grooves (3) is equipped with bolts (33), and each bolt (33) is threaded with two nuts (34).

4. The air preheating device for thermal power plants according to claim 1, characterized in that, A compressed gas injection cylinder a (4) and a high-pressure liquid injection pipe (41) are fixedly installed on the top seat (12). A compressed gas injection cylinder b (42) is fixedly installed on the base (1) at the same position as the compressed gas injection cylinder a (4). A quick connector (43) is provided at one end of the compressed gas injection cylinder a (4), the high-pressure liquid injection pipe (41) and the compressed gas injection cylinder b (42).

5. The air preheating device for thermal power plants according to claim 4, characterized in that, The compressed gas injection cylinder b (42) and the compressed gas injection cylinder a (4) are arranged opposite to each other, and the compressed gas injection cylinder a (4), the high-pressure liquid injection pipe (41) and the compressed gas injection cylinder b (42) are arranged horizontally with the rotor (14).

6. The air preheating device for thermal power plants according to claim 1, characterized in that, The base (1) is fixedly connected to the top of the lower beam (5), and the top seat (12) is connected to the bottom of the upper beam (51).

7. The air preheating device for thermal power plants according to claim 6, characterized in that, The bottom of the upper beam (51) is fixedly installed with a guide bearing (52), and the top of the lower beam (5) is fixedly installed with a push bearing (53). The rotor (14) is rotatably connected between the guide bearing (52) and the push bearing (53).

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