Air preheater

Abstract

The utility model relates to an air preheater which comprises a shell, a rotor and a cleaning device, and a smoke inlet channel for smoke to enter the rotor of the air preheater is defined in the shell; the rotor is rotatably arranged in the shell; the cleaning device comprises a support, a brush, a first rotating shaft and a driving mechanism, the support is installed in the smoke inlet channel, the brush is rotatably connected to the support through the first rotating shaft, bristles of the brush are suitable for making contact with a rotor of the air preheater, the driving mechanism is connected with the first rotating shaft, and the first rotating shaft is driven by the driving mechanism to rotate. And the first rotating shaft is driven to rotate. When smoke dust attached to the rotor needs to be cleaned, the driving mechanism is started to drive the first rotating shaft to rotate, the first rotating shaft drives the brush to rotate, so that the brush rotates relative to the rotor, the bristles of the brush clean the smoke dust on the surface of the rotor, and the smoke dust is prevented from forming hard blocks on the surface of the rotor to cause blockage; the heat exchange performance of the heat exchanger is prevented from being reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of thermal power plants, and in particular to an air preheater. Background Art

[0002] The air preheater of a thermal power plant is usually installed in the tail flue of the boiler. When the flue gas generated by combustion flows through the air preheater, the rotor inside the air preheater rotates so that the heat sink installed on the rotor switches between the flue gas channel and the air channel, so that the flue gas in the flue gas channel and the fresh air in the air channel can exchange heat through the heat sink, thereby achieving the effect of heating the fresh air. The heated fresh air is used to be provided to the combustion chamber of the boiler.

[0003] However, during the use of the air preheater, as the use time increases, the dust in the flue gas will accumulate on the rotor of the preheater. If it is not cleaned in time, the dust adhering to the rotor surface will form hard lumps and cause blockage, thereby reducing the heat exchange efficiency of the preheater and affecting the use of the air preheater. Utility Model Content

[0004] The purpose of the present disclosure is to provide an air preheater which can solve the technical problem that dust adhered to the rotor forms hard lumps.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides an air preheater, which includes a shell, a rotor and a cleaning device, wherein the shell defines a smoke inlet channel for smoke gas to enter the rotor of the air preheater; the rotor is rotatably arranged in the shell; the cleaning device includes a bracket, a brush, a first rotating shaft and a driving mechanism, the bracket is installed in the smoke inlet channel, the brush is rotatably connected to the bracket through the first rotating shaft, the bristles of the brush are suitable for contacting the rotor of the air preheater, and the driving mechanism is connected to the first rotating shaft to drive the first rotating shaft to rotate.

[0006] Optionally, there are multiple brushes and multiple first rotating shafts, each brush is rotatably connected to the bracket via a corresponding first rotating shaft, and the driving mechanism drives multiple first rotating shafts to rotate simultaneously.

[0007] Optionally, the driving mechanism includes a motor, a first external gear, a second external gear and a second rotating shaft, the motor is mounted on the bracket, the output shaft of the motor is transmission connected to the second rotating shaft, the first external gear is mounted on the first rotating shaft, the second external gear is mounted on the second rotating shaft, and the first external gear and the second external gear are meshed with each other.

[0008] Optionally, a plurality of the brushes are evenly arranged around the second rotating shaft.

[0009] Optionally, a support seat is fixed to the inner wall of the housing. The support seat is provided with a support hole, and the first rotating shaft passes through the support hole.

[0010] Optionally, a filter screen plate is detachably installed in the smoke inlet channel, and the filter screen plate is located upstream of the bracket in the smoke inlet channel.

[0011] Optionally, an insertion interface communicating with the inside of the smoke inlet channel is formed in the outer wall of the housing. The filter screen plate is inserted and fixed in the insertion interface. First slots and second slots are arranged in parallel on the inner wall of the housing. The first slots and the second slots are arranged oppositely. Two sides of the filter screen plate are respectively located in the first slots and the second slots.

[0012] Optionally, an air pipe is fixed to the outer wall of the housing. The air pipe communicates with the smoke inlet channel, and one end of the air pipe connected to the air pipe is adapted to be located between the brush and the rotor in the axial direction of the smoke inlet channel.

[0013] Optionally, the housing includes a first housing and a second housing. A locking device is arranged on the first housing. The first housing is detachably locked and fixed to the second housing through the locking device. The first housing defines the smoke inlet channel, and the rotor is arranged in the second housing.

[0014] Optionally, the locking device includes a plurality of fixing seats and a plurality of locking rods. The plurality of fixing seats are distributed on the outer wall of the second housing close to the first housing. The locking rods are threadedly connected to the fixing seats, and the ends of the locking rods are used to abut against the outer wall of the second housing.

[0015] Through the above technical solutions, when it is necessary to clean the soot attached to the rotor, the driving mechanism is started to drive the first rotating shaft to rotate. The first rotating shaft drives the brush to rotate, so that the brush rotates relative to the rotor. The bristles of the brush clean the soot on the surface of the rotor, preventing the soot from forming hard lumps on the surface of the rotor and causing blockage, and avoiding the decline of the heat exchange performance of the heat exchanger. The cleaned soot enters the downstream of the air preheater along the flow direction of the flue gas through the rotor of the air preheater under the action of the flue gas.

[0016] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0018] Figure 1It is a partial sectional structure schematic diagram of an air preheater provided by an exemplary embodiment of the present disclosure;

[0019] Figure 2 is Figure 1 a partially enlarged view;

[0020] Figure 3 It is a structure schematic diagram of an insertion interface provided by an exemplary embodiment of the present disclosure;

[0021] Figure 4 It is a structure schematic diagram of a bracket provided by an exemplary embodiment of the present disclosure.

[0022] Description of reference numerals

[0023] 100 - housing; 101 - insertion interface; 102 - first slot; 103 - second slot; 110 - first housing; 120 - second housing; 130 - flue gas inlet channel;

[0024] 200 - rotor;

[0025] 300 - cleaning device; 310 - bracket; 320 - brush; 330 - first rotating shaft; 340 - driving mechanism; 341 - driving motor; 342 - first external gear; 343 - second external gear; 344 - second rotating shaft;

[0026] 400 - support seat;

[0027] 500 - filter screen plate;

[0028] 600 - air pipe;

[0029] 700 - locking device; 710 - fixing seat; 720 - locking rod. Detailed implementation manners

[0030] The following will describe the detailed implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only for explaining and understanding the present disclosure, and are not used to limit the present disclosure.

[0031] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by terms such as "upstream" and "downstream" is defined based on the flow direction of the flue gas (the flue gas will flow from upstream to downstream). It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present disclosure. In addition, the terms "inside" and "outside" refer to the inside and outside of the corresponding structural contour. In addition, terms such as "first" and "second" are only used to distinguish one element from another, and do not have sequence and importance.

[0032] In the description of the present disclosure, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "connected", "coupled", and "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0033] The present disclosure provides an air preheater, which can solve the technical problem that the dust on the rotor of the existing air preheater cannot be processed in time.

[0034] As Figures 1 to 4 shown, the air preheater includes a housing 100, a rotor 200, and a cleaning device 300. A flue gas inlet passage 130 for the flue gas to enter the rotor 200 of the air preheater is defined inside the housing 100. The rotor 200 is rotatably arranged in the housing 100. The cleaning device 300 includes a bracket 310, a brush 320, a first rotating shaft 330, and a driving mechanism 340. The bracket 310 is installed in the flue gas inlet passage 130. The brush 320 is rotatably connected to the bracket 310 through the first rotating shaft 330. The bristles of the brush 320 are adapted to contact the rotor 200 of the air preheater. The driving mechanism 340 is connected to the first rotating shaft 330 to drive the first rotating shaft 330 to rotate.

[0035] Through the above technical solution, when it is necessary to clean the soot attached to the rotor 200, the driving mechanism 340 is started to drive the first rotating shaft 330 to rotate. The first rotating shaft 330 drives the brush 320 to rotate, so that the brush 320 rotates relative to the rotor 200. The bristles of the brush 320 clean the soot on the surface of the rotor 200, preventing the soot from forming hard lumps on the surface of the rotor 200 and causing blockage, and avoiding the decline of the heat exchange performance of the heat exchanger. The cleaned soot enters the downstream of the air preheater through the rotor 200 of the air preheater along the flow direction of the flue gas under the action of the flue gas.

[0036] It should be noted that the air preheater usually further includes a flue gas outlet passage (not shown in the drawings) for the flue gas to leave the air preheater, an air inlet passage (not shown in the drawings) for the air to enter the air preheater, and an air outlet passage (not shown in the drawings) for the air to leave the air preheater.

[0037] In some alternative embodiments, the number of the brushes 320 and the first rotating shafts 330 is multiple. Each brush 320 is rotatably connected to the bracket 310 through a corresponding first rotating shaft 330. The driving mechanism 340 drives the multiple first rotating shafts 330 to rotate simultaneously. The multiple brushes 320 can clean different positions of the rotor 200 at the same time, improving the cleaning efficiency of the rotor 200.

[0038] As Figure 1 , Figure 2 and Figure 4 shown, in some alternative embodiments, the drive mechanism 340 includes a motor, a first external gear 342, a second external gear 343, and a second rotating shaft 344. The motor is mounted on the bracket 310, and the output shaft of the motor is drivingly connected to the second rotating shaft 344. The first external gear 342 is sleeved on the first rotating shaft 330, and the second external gear 343 is sleeved on the second rotating shaft 344. The first external gear 342 meshes with the second external gear 343. When the output shaft of the motor drives the second rotating shaft 344 to rotate, it drives the second external gear 343 to rotate. The second external gear 343 drives the first external gear 342 to rotate through meshing, and then drives the first rotating shaft 330 to rotate, achieving the purpose of driving the brush 320 to rotate and clean the surface of the rotor 200.

[0039] It should be noted that when the number of the brushes 320 and the first rotating shafts 330 is multiple, a first external gear 342 is provided on each first rotating shaft 330. Moreover, the meshing mode between the first external gear 342 and the second external gear 343 can be either to provide a single second external gear 343 on the second rotating shaft 344 and mesh all the first external gears 342 with the same second external gear 343 simultaneously, or to provide multiple external gears on the second rotating shaft 344 and mesh each first external gear 342 with a single second external gear 343 separately. The present disclosure does not make specific limitations on this.

[0040] As Figure 1 and Figure 2 shown, in the present disclosure, a single second external gear 343 is provided on the second rotating shaft 344, and all the first external gears 342 are meshed with the same second external gear 343 simultaneously. This can reduce the number of second external gears 343, shorten the length of the second rotating shaft 344, and is beneficial to reducing the volume of the drive mechanism 340.

[0041] In some alternative embodiments, multiple brushes 320 are evenly arranged around the second rotating shaft 344. The brushes 320 evenly arranged around the second rotating shaft 344 can further improve the cleaning effect on the rotor 200.

[0042] As Figure 1 and Figure 2 shown, in some alternative embodiments, a support seat 400 is fixed to the inner wall of the housing 100. The support seat 400 is provided with a support hole, and the first rotating shaft 330 passes through the support hole. The provision of the support seat 400 can provide a supporting force for the first rotating shaft 330 to prevent the first rotating shaft 330 from bending and deforming after long-term use, resulting in a reduced contact area between the brush 320 and the rotor 200.

[0043] It should be noted that the support base 400 can be arranged at the position between the bracket 310 and the rotating shaft.

[0044] Optionally, a dust-proof bearing can be installed between the support hole and the first rotating shaft 330 to reduce the friction force between the support hole and the first rotating shaft 330.

[0045] In some alternative embodiments, a filter screen plate 500 is detachably installed in the smoke inlet passage 130, and the filter screen plate 500 is located upstream of the bracket 310 in the smoke inlet passage 130. Setting the filter screen plate 500 can preliminarily filter the dust in the flue gas, so as to reduce the amount of dust attached to the rotor 200 and lower the cleaning difficulty of the rotor 200. At the same time, after the filter screen has been used for a period of time, the filter screen can be disassembled for replacement or cleaning to maintain the filtering performance of the filter screen.

[0046] In order to facilitate the disassembly and installation of the filter screen plate 500, in some alternative embodiments, as Figures 1 to 3 shown, an insertion port 101 communicating with the inside of the smoke inlet passage 130 is formed on the outer wall of the housing 100, and the filter screen plate 500 is inserted and fixed in the insertion port 101. First slots 102 and second slots 103 parallel to each other are provided on the inner wall of the housing 100. The first slots 102 and the second slots 103 are arranged oppositely, and both sides of the filter screen plate 500 are respectively located in the first slots 102 and the second slots 103. The filter screen plate 500 can be inserted into the smoke inlet passage 130 or taken out from the smoke inlet passage 130 through the insertion port 101. Moreover, the first slots 102 and the second slots 103 provided on the inner wall of the housing 100 can respectively guide and support the opposite sides of the filter screen plate 500, which can not only facilitate the movement of the filter screen plate 500, but also reduce the deformation of the filter screen plate 500.

[0047] It should be noted that the filter screen plate 500 has a mesh structure with mesh holes in the middle and a frame fixed around the periphery. After the filter screen plate 500 is inserted into the smoke inlet passage from the insertion port 101, one side frame of the filter screen plate 500 can be hermetically connected to the insertion port 101 or one side frame of the filter screen plate 500 can be hermetically connected to the insertion port 101 through a sealing structure to prevent the flue gas from escaping from the insertion port 101.

[0048] As Figure 1 and Figure 2As shown, in some alternative embodiments, an air pipe 600 is fixed to the outer wall of the housing 100. The air pipe 600 communicates with the smoke inlet channel 130, and one end of the air pipe 600 connected to the air pipe 600 is axially located between the brush 320 and the rotor 200 in the smoke inlet channel 130. The air pipe 600 is used to introduce high-pressure gas into the smoke inlet channel 130. By the action of the high-pressure gas between the brush 320 and the rotor 200, the dust attached to the brush 320 can be cleaned, and the cleaning effect of the brush 320 on the rotor 200 can be improved.

[0049] As Figure 1 shown, in some alternative embodiments, as Figure 1 shown, the housing 100 includes a first housing 110 and a second housing 120. A locking device 700 is provided on the first housing 110. The first housing 110 is detachably locked and fixed to the second housing 120 through the locking device 700. The first housing 110 defines the smoke inlet channel 130, and the rotor 200 is arranged in the second housing 120. Detachably connecting the first housing 110 and the second housing 120 through the locking device 700 can realize the replacement of the brush 320.

[0050] Regarding the specific structure of the locking device 700, in some alternative embodiments, the locking device 700 includes a plurality of fixing seats 710 and a plurality of locking rods 720. The plurality of fixing seats 710 are distributed on the outer wall of the second housing 120 close to the first housing 110. The locking rods 720 are threadedly connected to the fixing seats 710, and the ends of the locking rods 720 are used to connect to the outer wall of the second housing 120.

[0051] During installation, the end face of the first housing 110 is attached to the end face of the second housing 120, and then by turning the locking rod 720, the end of the locking rod 720 is connected to the outer wall of the second housing 120 to realize the fixation of the first housing 110 and the second housing 120.

[0052] It should be noted that the end of the locking rod 720 can realize the fixation of the first housing 110 and the second housing 120 by abutting against the outer wall of the second housing 120, and the end of the locking rod 720 can also realize the fixation of the first housing 110 and the second housing 120 by being threadedly connected to the outer wall of the second housing 120.

[0053] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0054] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0055] In addition, any combination can be made between various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. An air preheater, characterized in that: include: A shell, wherein the shell defines a smoke inlet passage for smoke to enter the rotor of the air preheater; A rotor rotatably disposed in the housing; A cleaning device, the cleaning device comprising a bracket, a brush, a first rotating shaft and a driving mechanism, the bracket being installed in the smoke inlet channel, the brush being rotatably connected to the bracket via the first rotating shaft, the bristles of the brush being suitable for contacting with the rotor of the air preheater, and the driving mechanism being connected to the first rotating shaft to drive the first rotating shaft to rotate.

2. The air preheater according to claim 1, characterized in that: There are multiple brushes and multiple first rotating shafts, each brush is rotatably connected to the bracket via a corresponding first rotating shaft, and the driving mechanism drives multiple first rotating shafts to rotate simultaneously.

3. The air preheater according to claim 1 or 2, characterized in that: The driving mechanism includes a motor, a first external gear, a second external gear and a second rotating shaft. The motor is installed on the bracket. The output shaft of the motor is transmission-connected to the second rotating shaft. The first external gear is sleeved on the first rotating shaft, and the second external gear is sleeved on the second rotating shaft. The first external gear and the second external gear are meshed with each other.

4. The air preheater according to claim 3, characterized in that: The plurality of brushes are evenly arranged around the second rotating shaft.

5. The air preheater according to claim 1 or 2, characterized in that: A support seat is fixed to the inner wall of the shell, the support seat is provided with a support hole, and the first rotating shaft is passed through the support hole.

6. The air preheater according to claim 1, characterized in that: A filter screen plate is detachably mounted in the smoke inlet passage, and the filter screen plate is located upstream of the bracket in the smoke inlet passage.

7. The air preheater according to claim 6, characterized in that: The outer wall of the shell is provided with a plug interface connected to the smoke inlet channel, and the filter screen is plugged into and fixed in the plug interface. The inner wall of the shell is provided with a first slot and a second slot parallel to each other, and the first slot and the second slot are arranged opposite to each other. Both sides of the filter screen are respectively located in the first slot and the second slot.

8. The air preheater according to claim 1, characterized in that: An air pipe is fixed to the outer wall of the shell, the air pipe is communicated with the smoke inlet channel, and one end of the air pipe connected to the air pipe is suitable for being located between the brush and the rotor in the axial direction of the smoke inlet channel.

9. The air preheater according to claim 1, characterized in that: The shell includes a first shell and a second shell. The first shell is provided with a locking device. The first shell is detachably locked and fixed to the second shell by the locking device. The first shell defines the smoke inlet channel. The rotor is arranged in the second shell.

10. The air preheater according to claim 9, characterized in that: The locking device includes a plurality of fixing seats and a plurality of locking rods. The plurality of fixing seats are distributed on the outer wall of the second shell close to the first shell. The locking rods are threadedly connected to the fixing seats. The ends of the locking rods are used to abut the outer wall of the second shell.

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