Manufacturing method of pressurized sealing system suitable for rotary air preheater

1. Rotor; 21. Radial sealing plate; 22. Axial sealing plate; 31. Pipeline; 32. Pressurizing parts; 33. Branch pipe; 34. First groove; 35. Second groove; 36. Sealing bellows; 37 , Entrance regulating door; 4. Seals; 5. Entrance flue.

detailed description

22. The technical solution of the present utility model will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

23. In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", " The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, It is constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

24. In the description of the utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or Is detachable connection, or integrally

Connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present utility model can be understood under specific circumstances.

25. As shown in Figures 1 and 2, a pressurized sealing system suitable for a rotary air preheater. The rotary air preheater includes a rotor 1, a sealing plate arranged on the outer side of the rotor 1, and a sealing plate arranged on the sealing plate. Pressure sealing system on the top. The rotor 1 has a plurality of airflow channels, including a flue gas side channel, an air side channel, etc., and the rotor 1 rotates along its own axis.

26. A sealing plate is arranged between adjacent airflow channels, and there is a gap between the sealing plate and the rotor 1, and a sealing element 4 is provided on the rotor 1. The height of the sealing element 4 is not greater than the height of the gap, and the sealing element 4 is used for In order to assist in sealing the gap between the rotor 1 and the sealing plate, to prevent the air flow channels on both sides of the sealing plate from leaking from each other, the sealing member 4 may not be provided. The sealing plate includes a radial sealing plate 21 arranged on the radial surface of the rotor 1 and an axial sealing plate 22 arranged on the axial surface of the rotor 1. The radial sealing plate 21 and the axial sealing plate 22 can be integrally formed In this embodiment, the radial sealing plate 21 is a fan-shaped plate, the upper and lower sides of the rotor 1 are provided with radial sealing plates 21, and the axial sealing plate 22 is provided on the shaft of the rotor 1. To the outside.

27. The pressurized sealing system includes a pipe 31, a pressurizing component 32 arranged on the pipe 31, a groove opened on the sealing plate, and a sealing bellows 36 arranged on the sealing plate. The groove is opened on the side of the sealing plate facing the rotor 1 Above, the sealing bellows 36 is arranged on the side of the sealing plate facing away from the rotor 1. The radial sealing plate 21 and the axial sealing plate 22 are both provided with grooves and provided with a sealing bellows 36. The sealing bellows 36 communicates with the groove. One end of the pipe 31 communicates with the inlet flue 5 of the rotary air preheater, the other end of the pipe 31 communicates with the tank through a sealed bellows 36, and the other end of the pipe 31 is sealed with the sealed bellows 36. In this embodiment, the supercharging component 32 is a supercharging fan.

28. Both the radial sealing plate 21 and the axial sealing plate 22 are provided with one or more grooves. By opening multiple grooves to form multiple air curtains, the sealing effect can be improved. Each groove is provided with one or more A sealed bellows 36, the other end of the pipe 31 is connected with a plurality of branch pipes 33, each sealed bellows 36 is connected to a branch pipe 33 in a sealing manner, the other end of the pipe 31 is connected to the radial sealing plate 21 and the axial sealing plate 22 through the branch pipe 33 The upper slots are connected. There is only one pipe 31 and only one pressurizing component 32. The flue gas in the inlet flue 5 of the rotary air preheater is pressurized through one pressurizing component 32 and transported to each groove to make the sealing plate An air curtain is formed between the rotor and the rotor 1, and the air curtain is used to prevent air leakage between adjacent airflow channels. There is no mechanical contact seal in the air curtain seal, which will not produce serious mechanical contact friction, and reduce the occurrence of wear and fall. Generally, the rotor 1 is placed horizontally and rotates on a horizontal plane. The upper and lower sides of the rotor 1 are provided with radial seal plates 21. However, due to the flow direction of the air flow, the gap between the lower side of the rotor 1 and the radial seal plate 21 on the lower side is There is less air leakage, so there is no need to install a pressurized sealing system.

29. As shown in Figure 2, the grooves on the radial sealing plate 21 extend in the radial direction of the rotor 1, and the grooves on the axial sealing plate 22 extend in the axial direction of the rotor 1. The groove on the radial sealing plate 21 includes a first groove 34 and a second groove 35, and the groove on the axial sealing plate 22 includes a first groove 34 and a second groove 35. Wherein, the first grooves 34 on the respective sealing plates are all located in the middle of the respective sealing plates, and the second grooves 35 on the respective sealing plates are closer to the flue gas side channel of the rotor 1 than the first grooves 34 on the same sealing plate. The pressure on the flue gas side is lower, and it is closer to the flue gas side to prevent air leakage more effectively. The first groove 34 on the radial seal plate 21 and the first groove 34 on the axial seal plate 22 may or may not communicate with each other. The second groove 35 on the radial seal plate 21 and the first groove 34 on the axial seal plate 22 The second grooves 35 may also communicate with each other or may not communicate with each other.

30. When the pressure of the pressurized flue gas of the pressurized sealing system is 3kpa higher than the primary air pressure, a groove is opened on one sealing plate, reducing the primary air leakage rate by about 50%; two grooves are opened on one sealing plate, and the primary air leakage is achieved. The percentage reduction rate can reach more than 70%, and the percentage reduction rate of secondary air leakage can reach more than 80%. The gas sealing effect of the pressurized flue gas is significantly improved. add

When the first groove 34 and the second groove 35 are opened at the same time when the pressure sealing system is opened, the air leakage rate of the air preheater can be reduced to a very low level (1.5%~4.5%) in theory, and the air leakage rate can generally be reduced by 3%~4% , And can increase the average temperature of the hot end of the air by 5℃~9℃, and the effect of energy saving and consumption reduction is remarkable; and because the leakage rate of the primary air is reduced, the effective utilization rate of the primary fan is increased, the margin of the primary fan is increased, and the adjustment margin is enlarged.

31. As shown in Figure 1, the sealing system also includes an entrance regulating door 37. The entrance regulating door 37 is located between the pressurizing component 32 and the entrance flue 5 of the rotary air preheater. The entrance regulating door 37 is electrically controlled. The amount of flue gas delivered to the supercharging component 32 is adjusted according to actual conditions.

32. The working principle of this embodiment is described in detail below:

33. Utilize the flue gas introduced from the inlet flue 5 of the boiler air preheater, pressurized by the pressurizing component 32, and drive into the first groove 34 and the second groove 35 of the pressurized sealing system, in the radial sealing plate 21, A sealing air curtain is formed between the axial sealing plate 22 and the rotor 1 to prevent the positive pressure air from leaking to the flue gas side. Without high flue gas pressure, it can reduce air leakage by more than 70%, greatly reduce the air leakage rate of the air preheater, and the sealing effect is very significant.

34. The above embodiments are only to illustrate the technical concept and features of the utility model, and their purpose is to allow those familiar with the technology to understand the content of the utility model and implement them accordingly, and should not limit the scope of protection of the utility model. . All equivalent changes or modifications made in accordance with the spirit of the utility model shall be covered by the protection scope of the utility model.

Please contact us at zhang@pride-cnc.com