CN219473723U - Air preheater - Google Patents
Air preheater Download PDFInfo
- Publication number
- CN219473723U CN219473723U CN202320429176.3U CN202320429176U CN219473723U CN 219473723 U CN219473723 U CN 219473723U CN 202320429176 U CN202320429176 U CN 202320429176U CN 219473723 U CN219473723 U CN 219473723U
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- pipeline
- flue
- air
- hot end
- air duct
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses an air preheater, which relates to the field of air preheaters, and comprises: the air preheater comprises an air preheater rotor, a flue and an air duct which are arranged in parallel, and a hot end sector plate; the air preheater rotor is respectively connected with and penetrates through the flue and the air duct, the hot end sector plate is arranged in the air duct and is positioned at the downstream side of the air preheater rotor, and the air preheater further comprises a pipeline; the pipeline is communicated with the flue and the air duct, a first port of the pipeline is arranged close to the surface of the hot end sector plate facing the downstream side of the air duct, and a second port of the pipeline is arranged in the flue. The flue and the air duct are connected through the pipeline, and pressure difference is generated between the flue and the hot end sector plate due to different pressures, so that fly ash in the cavity of the hot end sector plate can be sucked into the pipeline to reach the flue, and normal operation of the hot end sector plate is ensured.
Description
Technical Field
The utility model relates to the field of air preheaters, in particular to an air preheater.
Background
In the use of the rotary air preheater, fly ash can be carried when the air inlet is in air, and is blown into the inner cavity of the sector plate through the static seal of the hot end of the air preheater and the clearance of the fan-shaped tail part, so that the fly ash is accumulated, the fan-shaped plate at the hot end is blocked or even the fan-shaped plate loses the regulation effect along with the load regulation, the air leakage rate is increased, the current of the air preheater is increased, and the hot end sealing piece of the air preheater is seriously worn.
Disclosure of Invention
The utility model aims to overcome the defect that fly ash is blown into an air inlet in the use process of a rotary air preheater in the prior art, so that the accumulation of the fly ash affects the work of a hot end sector plate.
The utility model solves the technical problems by the following technical scheme:
an air preheater, comprising: the air preheater comprises an air preheater rotor, a flue and an air duct which are arranged in parallel, and a hot end sector plate; the air preheater rotor is respectively connected with and penetrates through the flue and the air duct, the hot end sector plate is arranged in the air duct and is positioned at the downstream side of the air duct of the air preheater rotor, and the air preheater further comprises a pipeline; the pipeline is communicated with the flue and the air duct, a first port of the pipeline is arranged close to the surface of the hot end sector plate facing the downstream side of the air duct, and a second port of the pipeline is arranged in the flue.
In the scheme, the structure is adopted, the flue is connected with the hearth outlet, a negative pressure environment is arranged in the flue, and positive pressure environments are arranged at the air flue and the inner cavity of the hot end sector plate. The flue and the air duct are connected with each other through the pipeline, and a pressure difference of about 17000Pa can be generated between the flue and the air duct due to positive and negative pressure differences of two ends. The inside of the air duct is positive pressure, the inside of the air duct is negative pressure, and gas in the air duct can be sucked into the air duct through the pipeline. The first port of the pipeline is close to the surface of the hot end sector plate facing the downstream side of the air duct, so that fly ash on the surface of the hot end sector plate can be sucked into the pipeline under the action of pressure difference. The fly ash reaches the inside of the flue through the pipeline, so that the cleaning effect on the fly ash on the surface of the hot end sector plate and the inner cavity is realized.
Preferably, the air preheater further comprises a dust collector disposed in the flue and on the downstream side of the second port.
In this scheme, adopt foretell structural style, the flying dust on hot end sector plate surface passes through the pipeline reaches the flue, dust collector sets up in the flue can realize getting into the fly ash in the flue is collected. The downstream side of the second port can realize that the fly ash is collected after leaving the pipeline and then blown downstream, so that the fly ash is prevented from staying in the pipeline.
Preferably, the part of the pipeline located in the air duct is integrally formed in the pipe wall of the air duct.
In the scheme, the structure is adopted, so that the tightness and the strength of the pipeline inside the air duct can be ensured. The pipeline inside the air duct is not beneficial to replacement, and fly ash on the surface of the hot end sector plate needs to be absorbed, so that the integrated pipeline reduces the possibility of faults and improves the efficiency of absorbing the fly ash on the surface of the hot end sector plate.
Preferably, the part of the pipeline located in the air duct is fixed on the pipe wall of the air duct.
In this scheme, adopt foretell structural style, the wind channel is inside the pipeline through with the pipe wall of wind channel is fixed, can realize making the pipeline can not produce in the wind channel is inside rocks. The first port can be fixedly close to the surface of the hot end sector plate facing the downstream side, and fly ash on the surface of the hot end sector plate is sucked in through the pipeline, so that the hot end sector plate is prevented from being blocked due to accumulation of the fly ash.
Preferably, the first port of the conduit is suspended and secured within the air duct.
In this scheme, adopt above-mentioned structural style, hang the first port of pipeline fixed in the wind channel, can realize in the wind channel first port through hang fixed keep close to the hot end sector plate the surface of wind channel downstream side. And enabling fly ash on the surface of the hot end sector plate to be sucked into the pipeline by the first port which is close to the fly ash, and completing cleaning of the surface of the hot end sector plate. And the hot end sector plate is prevented from being blocked due to accumulation of fly ash so as to be failed.
Preferably, the air preheater further comprises an expansion joint, and the expansion joint is arranged on the pipeline.
In the scheme, the structure is adopted, and the temperature in the flue is increased in the use process of the pipeline due to the fact that the temperature generated by the burner is high, so that the pipeline is expanded. The expansion joint has deformation capability, and the expansion energy in the pipeline can be deformed along with the temperature change of the pipeline by arranging the expansion energy on the pipeline, so that the normal operation of the pipeline is protected, and the pipeline is prevented from being broken due to temperature difference.
Preferably, the expansion joint is arranged at a part of the pipeline between the air duct and the flue.
In the scheme, the structure is adopted, so that the pipeline between the air duct and the flue can be subjected to temperature difference change along with the use of the pipeline, and the pipeline is expanded and deformed. The temperature of the pipeline part close to the air duct and the flue is similar to the temperature of the flue and the air duct, and the pipeline is not easy to expand due to temperature change caused by the communication of the pipeline.
Preferably, the air preheater further comprises a gate valve, and the gate valve is arranged on the pipeline.
In this scheme, adopt foretell structural style, the gate valve plays the switching effect to the pipeline. When dust collection is needed, the gate valve of the pipeline is opened, and the pipeline enables the flue to be communicated with the air duct to generate negative pressure difference, so that fly ash is sucked from the air duct to the flue. When the air preheater does not work, no huge pressure difference exists between the flue and the air duct, and the effect of closing the pipeline is achieved by the gate valve on the pipeline in order to prevent the gas in the flue and the gas in the air duct from being mixed.
Preferably, the gate valve is disposed at a portion of the pipeline between the air duct and the flue.
In the scheme, the structure is adopted, the pipeline between the air duct and the flue is not arranged in the pipe, and the gate valve switch can be conveniently operated. The flue with pipeline in the wind channel is unfavorable for the switching operation of gate valve, and the gate valve is along with long-time use needs to be changed, the flue with pipeline space between the wind channel is great be favorable to the change of gate valve.
Preferably, the air preheater comprises a plurality of said lines.
In this aspect, in the above-described structural form, the plurality of pipes may be provided so as to be positioned close to the surface of the hot end sector plate facing the downstream side. The area of the hot end sector plate is larger, the hot end sector plate can be comprehensively cleaned through the multipoint arrangement of a plurality of pipelines, and the phenomenon that the hot end sector plate cannot work normally due to movement blocking caused by accumulation of fly ash is avoided.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the utility model.
The utility model has the positive progress effects that: the flue and the air duct are connected by using the pipeline, and the gas in the air duct flows to the flue by utilizing the pressure difference generated by the temperature difference between the flue and the air duct. Fly ash on the surface of the hot end sector plate is absorbed through the flowing of the gas, so that the fly ash is prevented from accumulating on the surface of the hot end sector plate, and the normal operation of the hot end sector plate is ensured.
Drawings
Fig. 1 is a schematic structural view of an air preheater according to an embodiment of the present utility model.
Reference numerals illustrate:
pipeline 1
Hot end sector plate 2
Air duct 3
Second air inlet 4
Flue 5
Air preheater rotor 6
Expansion joint 12
Gate valve 13
Detailed Description
The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.
As shown in fig. 1, the air preheater in the present embodiment comprises an air preheater rotor 6, a flue 5 and an air duct 3 which are arranged in parallel, and a hot end sector plate 2; the air preheater rotor 6 is respectively connected with and penetrates through the flue 5 and the air duct 3, the hot end sector plate 2 is arranged in the air duct 3 and is positioned at the downstream side of the air preheater rotor 6, and the air preheater further comprises a pipeline 1; the pipeline 1 is communicated with the flue 5 and the air duct 3, a first port of the pipeline 1 is arranged close to the surface of the hot end sector plate 2 facing the downstream side, and a second port of the pipeline 1 is arranged in the flue 5. Both "upstream side" and "downstream side" are defined herein in terms of the direction of fluid flow in the tunnel 3 and the flue 5. As shown in fig. 1, the directions indicated by solid arrows in the drawing are the directions of fluid flow in the air duct 3 and the flue 5 of the present embodiment. The downstream side of the air duct 3 is an air outlet, and the upstream side of the air duct 3 is an air inlet. The line 1 is a DN150 line, the DN150 line ensuring that the diameter of the line 1 is such that fly ash can enter the line 1 and does not cause clogging of the line 1.
In this embodiment, the flue 5 is connected to the burner, and the high-temperature flue gas generated in the combustion process of the burner is discharged into the flue 5, and a negative pressure of about 4000Pa exists inside the flue 5. The air duct 3 is internally provided with external air sucked by the air duct 3 and the second air inlet 4, and under the action of a fan, positive pressure of about 13000Pa exists in the air duct 3. There is thus a pressure difference of about 17000Pa between the flue 5 and the tunnel 3. The internal temperature of the air duct 3 is low and positive pressure, and the internal temperature of the air duct 5 is high and negative pressure. The gas can flow from the positive pressure to the negative pressure, and the gas in the air duct 3 can be sucked into the flue 5 through the pipeline 1 under the action of pressure difference. The first port of the pipe 1 is close to the downstream facing surface of the hot end sector plate 2. The first port is close to and faces the surface of the hot end sector plate 2, so that fly ash on the surface of the hot end sector plate 2 can be sucked into the pipeline 1 together with the gas in the air channel 3 under the action of pressure difference. The fly ash flows along with the flowing gas to reach the inside of the flue 5 through the pipeline 1, so that the cleaning effect on the fly ash on the surface of the hot end sector plate 2 is realized. The fly ash accumulation on the surface of the hot end sector plate 2 and the inner cavity is avoided, so that the hot end sector plate 2 can work normally.
The air preheater further comprises a dust collector arranged in the flue 5 and downstream of the second port. The dust collector can be a pulse bag type dust collector, an electric bag type dust collector or an electric dust collector.
In this embodiment, fly ash on the surface of the hot end sector plate 2 accompanies the gas flowing due to the pressure difference through the duct 1 to the flue 5. The dust collector is arranged in the flue 5 and can collect the fly ash entering the flue 5, and the fly ash sucked into the flue 5 is prevented from scattering everywhere by the collection of the dust collector, so that the fly ash can be collected intensively, and secondary pollution to the flue 5 is avoided. The downstream side of the second port enables the collection of fly ash by the dust collector after the fly ash leaves the duct 1, avoiding the fly ash from staying inside the duct 1 or the backflow of fly ash in the flue 5 when the burner is not heating, so that the fly ash passing through the duct 1 can all enter the dust collector.
In this embodiment, the portion of the pipeline 1 located in the air duct 3 is integrally formed inside the pipe wall of the air duct 3. The pipe wall forms a pipeline 1 inside.
The strength of the integrated pipeline 1 is improved, the integrated pipeline 1 has stronger durability, and the risk of damage of the pipeline 1 caused by secondary connection is avoided. The sealing performance and strength of the pipeline 1 inside the air duct 3 can be guaranteed, the pipeline 1 inside the air duct 3 needs to collect fly ash on the surface of the hot end sector plate 2, and the fly ash on the surface of the hot end sector plate 2 enters the pipeline 1 together with gas. Because the inner space of the air duct 3 is narrow, the pipeline 1 in the air duct 3 is not convenient to replace, and fly ash on the surface of the hot end sector plate 2 is required to be absorbed, the integrated pipeline 1 reduces the possibility of faults, improves the efficiency of absorbing the fly ash on the surface of the hot end sector plate 2, reduces the maintenance frequency of the pipeline 1 in the air duct 3, and prolongs the service life of the air preheater.
In other embodiments, the portion of the conduit 1 located within the air chute 3 is secured to the wall of the air chute 3. Pipeline 1 inside wind channel 3 passes through welded mode and the pipe wall fixed connection in wind channel 3, and welded mode can make pipeline 1 more firm with the connection in wind channel 3, can select pipeline 1 and the hookup location in wind channel 3 as required during the welding. The pipeline 1 does not shake inside the air duct 3. So that the first port can be fixed close to the downstream facing surface of the hot end sector plate 2. When the first port is close to the surface of the hot end sector plate 2, fly ash on the surface of the hot end sector plate 2 is affected by the pressure difference, and the following gas is sucked into the pipeline 1, so that fly ash is prevented from scattering everywhere. When the pipeline 1 shakes in the air duct 3, the pipeline 1 is easy to deviate, so that fly ash cannot accurately enter the pipeline 1. Fly ash on the surface of the hot end sector plate 2 is sucked through the pipeline 1, so that the fault of the hot end sector plate 2 caused by the blocking of the hot end sector plate 2 due to the accumulation of the fly ash is avoided. And the pipeline 1 is internally provided with a pipeline for circulating gas and fly ash, and the welding mode can ensure the fixing reliability and the tightness to avoid the gas leakage.
In other embodiments, the first port of the conduit 1 is suspended and secured within the air chute 3. A fixed support in welded connection is arranged in the air duct 3, and the fixed pipeline 1 is suspended through the fixed support. When the pipeline 1 is suspended and fixed, the position of the first port of the pipeline 1 can be adjusted, so that the first port of the pipeline 1 is close to the surface of the hot end sector plate 2 facing the downstream side, fly ash collection on the surface of the hot end sector plate 2 is realized, and the convenience for adjusting the position of the first port of the pipeline 1 is improved. So that the first port of the pipe 1 can be kept close to the surface of the hot end sector plate 2 facing the downstream side, avoiding the hot end sector plate 2 from malfunctioning due to the accumulation of fly ash.
As shown in fig. 1, the air preheater further comprises an expansion joint 12, and the expansion joint 12 is arranged on the pipeline 1.
In this embodiment, the pipe 1 expands during use due to the elevated temperature in the flue 5 caused by the elevated air temperature generated by the burner. The expansion joint 12 has a deformability capable of expanding and deforming with a temperature rise, and the expansion joint 12 is provided in the pipe 1, so that the expansion joint 12 in the pipe 1 can expand and contract with a temperature change of the pipe 1. The expansion and contraction of other pipeline parts of the pipeline 1 along with temperature change are avoided, and the normal operation of the pipeline 1 is protected, so that the pipeline 1 is prevented from being damaged due to deformation and cracking of the pipeline 1 caused by temperature difference. The expansion joint 12 can use a circular double-ripple expansion joint, and the circular double-ripple expansion joint mainly utilizes the elastic expansion function of the circular double-ripple expansion joint to compensate the deformation of a pipeline caused by thermal deformation, mechanical deformation and various mechanical vibrations, has good heat resistance and lower cost, and effectively reduces the use and manufacturing cost of the air preheater.
As shown in fig. 1, an expansion joint 12 is provided at a portion of the pipe 1 between the air duct 3 and the flue 5.
In this embodiment, the pipeline 1 between the air duct 3 and the flue 5 generates a temperature change along with the air flow inside the pipeline 1, so that the pipeline 1 is deformed in a telescopic manner. The temperature of the part of the pipeline 1 close to the air duct 3 and the air duct 5 is similar to the temperature of the air duct 5 and the air duct 3, and the expansion of the pipeline 1 is not easy to be caused by the change of the temperature caused by the communication of the pipeline 1. The expansion joint 12 is arranged between the air duct 3 and the flue 5, so that the deformation part of the pipeline 1 is protected by the expansion joint 12, and the pipeline 1 is prevented from being damaged in the use process.
As shown in fig. 1, the air preheater further comprises a gate valve 13, and the gate valve 13 is disposed on the pipeline 1.
In the present embodiment, the gate valve 13 can function as a switch for the piping 1. When dust collection is needed, the gate valve 13 of the pipeline 1 is opened, the pipeline 1 is communicated with the air flue 5 and the air flue 3, the pressure difference is generated by means of the temperature difference between the air flue 5 and the air flue 3, and fly ash is sucked from the air flue 3 to the air flue 5 through the flowing of gas. When the air preheater does not work, no huge pressure difference exists between the flue 5 and the air duct 3, and in order to avoid mixing of gas in the flue 5 and gas in the air duct 3, the gate valve 13 on the pipeline 1 is used for closing the pipeline 1, so that communication between the air duct 3 and the flue 5 can not occur. The gate valve can be a flat gate valve or a blade gate valve.
As shown in fig. 1, the gate valve 13 is provided at a portion of the duct 1 between the air duct 3 and the flue 5.
In this embodiment, the pipeline 1 can be closed without being communicated when the air preheater is not in operation, and the pipeline 1 is opened when the air preheater is in operation so that the air duct 3 is connected with the flue 5. The pipeline 1 between the air duct 3 and the flue 5 is not in the pipe, so that the operation of conveniently opening and closing the gate valve 13 can be realized. The duct 5 and the duct 1 in the duct 3 do not facilitate the opening and closing operations of the gate valve 13 and thus the installation of the gate valve 13. The gate valve 13 is easy to leak air with long-time use, and the gate valve 13 needs to be replaced, so that the large space of the pipeline 1 between the flue 5 and the air duct 3 is beneficial to the replacement of the gate valve 13.
As shown in fig. 1, the air preheater comprises a plurality of lines 1. In the present embodiment, 3 lines are provided, but the present utility model is not limited thereto, and a person skilled in the art may set the number of lines as needed.
By arranging the pipelines 1, a plurality of first ports of the pipelines 1 are close to different parts of the surface of the hot end sector plate 2 facing the downstream side, and because the area of the hot end sector plate 2 is large, fly ash on the hot end sector plate 2 is generally unevenly distributed, dust collection on the surface fly ash of the hot end sector plate 2 can be realized from a plurality of points through arranging the pipelines 1, and dust collection blind areas are avoided. The fly ash on the surface of the hot end sector plate 2 can enter the pipeline 1 as much as possible, and the phenomenon that the hot end sector plate 2 cannot work normally due to blocking of the movement of the hot end sector plate 2 caused by accumulation of the fly ash is avoided.
While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.
Claims (10)
1. An air preheater, comprising: the air preheater comprises an air preheater rotor, a flue and an air duct which are arranged in parallel, and a hot end sector plate; the air preheater rotor is respectively connected with and penetrates through the flue and the air duct, and the hot end sector plate is arranged in the air duct and positioned at the downstream side of the air preheater rotor;
the pipeline is communicated with the flue and the air duct, a first port of the pipeline is arranged close to the surface of the hot end sector plate facing the downstream side of the air duct, and a second port of the pipeline is arranged in the flue.
2. The air preheater as set forth in claim 1, further comprising a dust collector disposed within said flue and downstream of said second port.
3. The air preheater as set forth in claim 1, wherein the portion of said conduit located within said air chute is integrally formed within the wall of said air chute.
4. The air preheater as set forth in claim 1, wherein the portion of said conduit located within said air chute is secured to the wall of said air chute.
5. The air preheater as set forth in claim 1, wherein the first port of the conduit is suspended and secured within the duct.
6. The air preheater as set forth in claim 1, further comprising an expansion joint disposed on said conduit.
7. The air preheater as set forth in claim 6, wherein said expansion joint is disposed in a portion of said conduit between said air chute and said flue.
8. The air preheater as set forth in claim 1, further comprising a gate valve disposed on said conduit.
9. The air preheater as set forth in claim 8, wherein said gate valve is disposed in a portion of said conduit between said air chute and said flue.
10. The air preheater as set forth in claim 1, wherein said air preheater comprises a plurality of said lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320429176.3U CN219473723U (en) | 2023-03-08 | 2023-03-08 | Air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320429176.3U CN219473723U (en) | 2023-03-08 | 2023-03-08 | Air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219473723U true CN219473723U (en) | 2023-08-04 |
Family
ID=87434610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320429176.3U Active CN219473723U (en) | 2023-03-08 | 2023-03-08 | Air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219473723U (en) |
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2023
- 2023-03-08 CN CN202320429176.3U patent/CN219473723U/en active Active
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