An air preheater

Abstract

The application relates to an air preheater, which comprises a preheater body, which is connected with an inlet flue pipe, an outlet flue pipe, an air inlet pipe and an air outlet pipe; a filter plate is detachably connected in the inlet flue pipe; a connecting port is arranged on the inner wall of one end of the inlet flue pipe, and the filter plate is inserted into the inlet flue pipe through the connecting port. When impurities are adhered to the surface of the filter plate and need to be cleaned, the filter plate can be directly pulled out from the inlet flue pipe through the connecting port for cleaning or replacement, so that the downtime is reduced, the work efficiency is improved, and the maintenance convenience is improved.

Description

Technical Field

[0001] This application relates to the field of heat exchangers, and more particularly to an air preheater. Background Technology

[0002] In the combustion system of a thermal power plant boiler, preheated air must be continuously introduced into the boiler to ensure complete combustion of fuel. As a key heat exchange device, the air preheater utilizes the waste heat of the flue gas at the boiler tail to preheat the intake air, which can significantly improve combustion efficiency and reduce energy consumption.

[0003] Traditional air preheaters are typically tubular or finned-tube type. Flue gas is blown onto the outer surface of the air ducts inside the preheater, transferring heat from the flue gas to the air within the ducts for preheating. Air preheaters usually contain filter plates to trap impurities such as ash and unburned particles from the flue gas, preventing blockage of the heat exchange elements. These filter plates are usually rigidly connected to the inner wall of the duct using welding or bolting.

[0004] Regarding the aforementioned technologies, when impurities accumulate on the surface of the filter plate, leading to increased flow resistance, it is necessary to stop the machine and remove some pipes for cleaning. This makes cleaning the filter plate inconvenient and affects work efficiency. Utility Model Content

[0005] To facilitate the cleaning of the filter plate and improve work efficiency, this application provides an air preheater.

[0006] The air preheater provided in this application adopts the following technical solution:

[0007] An air preheater includes a preheater body, which is connected to a flue gas inlet pipe, a flue gas outlet pipe, an air inlet pipe, and an air outlet pipe. A filter plate is detachably connected inside the flue gas inlet pipe. A connection port is provided on the inner wall of one end of the flue gas inlet pipe for the filter plate to pass through. The filter plate is inserted into the flue gas inlet pipe through the connection port.

[0008] By adopting the above technical solution, when impurities adhere to the surface of the filter plate and need to be cleaned, the operator can directly pull the filter plate out of the flue pipe through the connection port for cleaning or replacement, reducing downtime, improving work efficiency, and enhancing maintenance convenience.

[0009] Optionally, an installation ring is detachably connected inside the flue pipe, the filter plate is connected to the inner wall of the installation ring, the connection port is used for the installation ring to pass through, and an opening and closing component is connected to the end of the installation ring away from the preheater body, the opening and closing component is used to open or open one end of the installation ring.

[0010] By adopting the above technical solution, when disassembling the filter plate, the opening at one end of the mounting ring is closed by the opening and closing component. After the opening at one end of the mounting ring is closed, the entire mounting ring is removed from the flue pipe. This reduces the possibility of impurities on the filter plate falling into the flue pipe during the movement of the filter plate, thus facilitating the cleaning of impurities.

[0011] Optionally, a connecting plate is connected to one end of the mounting ring. The connecting plate is used to cover the connection port and is detachably connected to the smoke inlet pipe.

[0012] By adopting the above technical solution, a connecting plate is added to cover the connection port, thereby improving the overall sealing performance of the device and reducing the possibility of flue gas being discharged through the gap between the inner wall of the connection port and the mounting ring.

[0013] Optionally, the opening and closing assembly includes a baffle and a connector. The connecting plate has a first channel for the baffle to pass through, and the inner wall of the mounting ring near the connecting plate has a second channel for the baffle to pass through. The first channel and the second channel are connected. The baffle is detachably connected to the mounting ring via the connector. The connecting plate is detachably connected to a sealing block, which is used to seal the first channel and the second channel when the preheater body is in operation.

[0014] By adopting the above technical solution, when disassembling the filter plate, the baffle is moved, passing through the first channel and the second channel, and one end of the baffle contacts the inner wall of the mounting ring, thereby closing the opening at one end of the mounting ring. This facilitates the closure of the opening at one end of the mounting ring. When the preheater body is in operation, the baffle is removed from the mounting ring and moved away from the flue gas inlet pipe, thereby facilitating the passage of flue gas through the filter plate. The sealing block is installed on the connecting plate to seal the first channel and the second channel, thereby improving the overall sealing performance of the device and reducing the possibility of flue gas being discharged through the first and second channels.

[0015] Optionally, the connecting plate has a rotating groove at the end away from the mounting ring. The connecting component includes a rotating rod, a spring, and a locking block. The length direction of the rotating rod is consistent with the depth direction of the first channel. One end of the rotating rod is rotatably connected to a baffle and is rotatably connected within the rotating groove. An mounting groove is formed on the inner wall of the rotating groove, and the length direction of the mounting groove is consistent with the radial direction of the rotating rod. One end of the spring is connected to the inner wall of the mounting groove, and the other end of the spring is connected to the locking block. The locking block slides and engages with the inner wall of the mounting groove. A locking groove is formed on the periphery of the rotating rod. The spring is used to drive the locking block to move and drive the locking block to insert into the locking groove. The locking block is inserted into the rotating rod through the locking groove. A first guide surface is provided on one end of the locking block along the periphery of the rotating rod. The first guide surface is used to guide the locking block away from the locking groove.

[0016] By adopting the above technical solution, when disassembling the filter plate, the baffle is moved so that it passes through the first channel and the second channel, and drives the baffle to close one end of the mounting ring opening. When the baffle closes one end of the mounting ring opening, the rotating rod is located in the rotating groove, and the locking groove is connected to the mounting groove. The spring pushes the locking block to move and drives the locking block to insert into the locking groove, so that the rotating rod is stably connected to the mounting ring. After the filter plate is disassembled, the rotating rod is rotated, and the first guide surface contacts the inner wall of the locking groove. Under the guidance of the first guide surface, the locking block is embedded in the mounting groove and moves away from the locking groove, so as to facilitate the removal of the rotating rod from the rotating groove and the removal of the baffle from the mounting ring, thus facilitating the disassembly and assembly of the baffle.

[0017] Optionally, a limiting block is connected to the outer wall of the mounting ring, and a limiting groove is provided on the inner wall of one side of the smoke inlet pipe for the limiting block to be inserted. The length direction of the limiting groove is consistent with the depth direction of the connection port, and the limiting block slides and fits in the limiting groove along the depth direction of the connection port.

[0018] By adopting the above technical solution, when installing the installation ring, the installation ring enters the smoke inlet pipe through the connection port. When the installation ring is inserted into the smoke inlet pipe, the limiting block slides and engages in the limiting groove. The limiting block slides and engages with the inner wall of the limiting groove, thereby limiting the movement direction of the installation ring and making the installation ring move stably in the predetermined direction.

[0019] Optionally, an insert block is connected to the outer wall of the end of the mounting ring away from the connecting plate, and a slot is provided on the inner wall of the end of the smoke inlet pipe away from the connecting port. The depth direction of the slot is consistent with the depth direction of the connecting port. The insert block is inserted into the inner wall of the smoke inlet pipe through the slot. A sealing layer is connected to the inner wall of the slot, and the sealing layer is in contact with the insert block.

[0020] By adopting the above technical solution, when the mounting ring is installed in the flue gas inlet pipe, the insert is placed in the slot and the insert is pressed against the sealing layer, thereby reducing the gap between the mounting ring and the inner wall of the flue gas inlet pipe, and reducing the situation where flue gas directly enters the preheater body through the gap between the mounting ring and the inner wall of the flue gas inlet pipe.

[0021] Optionally, a handle is attached to the end of the connecting plate away from the mounting ring.

[0022] By adopting the above technical solution, a handle is added to facilitate the removal of the installation ring from the smoke inlet pipe by the operator when disassembling the installation ring.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When impurities adhere to the surface of the filter plate and need to be cleaned, the operator can directly pull the filter plate out of the flue pipe through the connection port for cleaning or replacement, reducing downtime, improving work efficiency, and enhancing maintenance convenience.

[0025] 2. When disassembling the filter plate, close one end of the mounting ring opening using the opening and closing assembly. After closing one end of the mounting ring opening, remove the entire mounting ring from the flue pipe. This reduces the chance of impurities on the filter plate falling into the flue pipe during the filter plate movement, thus facilitating the cleaning of impurities.

[0026] 3. When disassembling the filter plate, move the baffle through the first channel and the second channel, so that one end of the baffle contacts the inner wall of the mounting ring, thereby closing the opening at one end of the mounting ring, which facilitates the closure of the opening at one end of the mounting ring. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of this embodiment.

[0028] Figure 2 This is a side view of this embodiment.

[0029] Figure 3 This is the embodiment. Figure 2 Partial sectional view along the AA direction.

[0030] Figure 4 This is the embodiment. Figure 2 Sectional view along the BB direction.

[0031] Figure 5 This is the embodiment. Figure 4 Enlarged view of section C.

[0032] Figure 6 This is the embodiment. Figure 3 Enlarged view of section D.

[0033] Figure 7 This is a cross-sectional structural diagram of this embodiment, used to illustrate the connector.

[0034] Figure 8 This is the embodiment. Figure 7 Enlarged view of section E in the middle.

[0035] Figure 9 This is a partial cross-sectional view of the embodiment in operation, used to show the sealing block.

[0036] Explanation of reference numerals in the attached drawings: 100, preheater body; 110, flue gas inlet pipe; 111, limiting groove; 112, slot; 113, sealing layer; 114, annular groove; 120, flue gas outlet pipe; 130, air inlet pipe; 140, air outlet pipe; 150, connection port; 200, mounting ring; 210, limiting block; 220, insertion block; 230, second channel; 300, connecting plate; 310, handle; 320, first channel; 330, rotating groove; 331, mounting groove; 400, opening and closing assembly; 410, baffle; 411, support plate; 420, connector; 421, rotating rod; 422, spring; 423, locking block; 424, locking groove; 425, first guide surface; 426, second guide surface; 500, sealing block; 510, first plate; 600, filter plate. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0038] This application discloses an air preheater. (Refer to...) Figure 1 , Figure 2 and Figure 3 An air preheater includes a preheater body 100, which is connected to an inlet pipe 110, an outlet pipe 120, an air inlet pipe 130, and an air outlet pipe 140. A filter plate 600 is detachably connected inside the inlet pipe 110. The filter plate 600 is detachably connected to the inlet pipe 110 to facilitate cleaning and replacement of the filter plate 600.

[0039] Reference Figure 3 and Figure 4 The filter plate 600 is connected to the inner wall of the smoke inlet pipe 110 via a mounting ring 200. The mounting ring 200 is square-ring-shaped, and the filter plate 600 is connected to the inner wall of the mounting ring 200. An annular groove 114 is formed on the inner wall of the smoke inlet pipe 110, communicating with a connection port 150. The mounting ring 200 is inserted into the smoke inlet pipe through the annular groove 114. When the mounting ring 200 is positioned within the annular groove 114, its inner wall is flush with the inner wall of the smoke inlet pipe 110. A connection port 150 is formed on the inner wall of one end of the smoke inlet pipe 110, allowing the mounting ring 200 to pass through. The filter plate 600 is inserted into the smoke inlet pipe 110 through the connection port 150.

[0040] Reference Figure 3A connecting plate 300 is attached to the outer wall of the mounting ring 200 near the connection port 150. The length of the connecting plate 300 is aligned with the length of the connection port 150. The connecting plate 300 covers the connection port 150. The end of the connecting plate 300 near the mounting ring 200 contacts the outer wall of the smoke inlet pipe 110. The connecting plate 300 is detachably connected to the smoke inlet pipe 110 by bolts, which pass through the connecting plate 300 and are threaded into the smoke inlet pipe 110. A handle 310 is attached to the end of the connecting plate 300 away from the mounting ring 200.

[0041] Reference Figure 4 and Figure 5 The top and bottom outer walls of the mounting ring 200 are connected to limit blocks 210. The inner walls of the ring groove 114 on both sides are provided with limit grooves 111 for the limit blocks 210 to be inserted. The length direction of the limit grooves 111 is consistent with the depth direction of the connection port 150. Each limit block 210 slides along the depth direction of the connection port 150 and engages with the inner wall of each limit groove 111.

[0042] Reference Figure 3 and Figure 4 An insert 220 is connected to the outer wall of the mounting ring 200 at the end away from the connecting plate 300. The length direction of the insert 220 is consistent with the length direction of the connecting port 150, and a slot 112 is formed on the inner wall of the ring groove 114 at the end away from the connecting port 150. The length direction of the slot 112 is consistent with the length direction of the insert 220, and the depth direction of the slot 112 is consistent with the depth direction of the connecting port 150. The insert 220 is inserted into the inner wall of the smoke inlet pipe 110 through the slot 112. A sealing layer 113, made of rubber, is connected to the inner wall of the slot 112, and the sealing layer 113 is in contact with the insert 220.

[0043] Reference Figure 3 and Figure 6An opening / closing assembly 400 is connected to the end of the mounting ring 200 away from the preheater body 100. The opening / closing assembly 400 is used to open or close the opening at one end of the mounting ring 200. The opening / closing assembly 400 includes a baffle 410 and a connector 420. The connecting plate 300 has a first channel 320 for the baffle 410 to pass through. The inner wall of the mounting ring 200 near the connecting plate 300 has a second channel 230 for the baffle 410 to pass through. The depth direction of the first channel 320 is consistent with the depth direction of the connection port 150, and the depth direction of the second channel 230 is consistent with the depth direction of the connection port 150. The first channel 320 and the second channel 230 are connected. The baffle 410 slides and fits within the mounting ring 200, the first channel 320, and the second channel 230 along the depth direction of the connection port 150. When the baffle 410 is located within the mounting ring 200, all sides of the baffle 410 are in contact with the inner wall of the mounting ring 200. When disassembling the filter plate 600, the opening at one end of the mounting ring 200 is closed by the baffle 410, thereby reducing the possibility of impurities on the surface of the filter plate 600 falling into the flue pipe 110 during disassembly, and facilitating the cleaning of impurities.

[0044] Reference Figure 3 and Figure 6 A support plate 411 is connected to one end of the baffle 410 near the connecting plate 300. The length direction of the support plate 411 is consistent with the length direction of the connecting plate 300, and the end of the support plate 411 near the baffle 410 is in contact with the connecting plate 300. The support plate 411 is detachably connected to the connecting plate 300 via a connector 420.

[0045] Reference Figure 6 and Figure 7 The connecting plate 300 has a rotating groove 330 at the end away from the mounting ring 200. The length direction of the rotating groove 330 is consistent with the depth direction of the connecting port 150. The connecting piece 420 includes a rotating rod 421, a spring 422, and a locking block 423. The length direction of the rotating rod 421 is consistent with the depth direction of the rotating groove 330. One end of the rotating rod 421 passes through and is rotatably connected to the baffle 410 along the length direction of the rotating rod 421. The rotating rod 421 is rotatably connected in the rotating groove 330.

[0046] Reference Figure 6 and Figure 8An installation groove 331 is formed on the inner wall of the rotating groove 330. The length direction of the installation groove 331 is consistent with the radial direction of the rotating rod 421. The length direction of the spring 422 is consistent with the length direction of the installation groove 331. One end of the spring 422 is connected to the inner wall of the installation groove 331, and the other end is connected to the locking block 423. The locking block 423 slides along the length direction of the installation groove 331 and is fitted into the inner wall of the installation groove 331. A locking groove 424 is formed on the circumference of the rotating rod 421, and the locking block 423 is inserted into the rotating rod 421 through the locking groove 424. A first guide surface 425 is provided on one end of the locking block 423 along the circumference of the rotating rod 421. The first guide surface 425 is inclined and is used to guide the locking block 423 away from the locking groove 424. A second guide surface 426 is provided on the end of the locking block 423 near the connecting plate 300. The second guide surface 426 is inclined and facilitates the insertion of the rotating rod 421 into the rotating groove 330. The locking block 423 is inserted into the rotating rod 421 through the locking groove 424, which facilitates the installation and removal of the baffle 410.

[0047] Reference Figure 9 A sealing block 500 is detachably connected to the connecting plate 300. The sealing block 500 is inserted into the connecting plate 300 and the mounting ring 200 through a first channel 320 and a second channel 230. A first plate 510 is connected to the end of the sealing block 500 away from the mounting ring 200. The first plate 510 is detachably connected to the connecting plate 300 by bolts, which pass through the first plate 510 and are threadedly connected to the connecting plate 300. When the preheater body 100 is in operation, the sealing block 500 is connected to the connecting plate 300.

[0048] The implementation principle of an air preheater according to an embodiment of this application is as follows: During use, flue gas enters the preheater body 100 through the flue gas inlet pipe 110. The filter plate 600 filters the flue gas to reduce impurities in the flue gas. When impurities adhere to the filter plate 600, the sealing block 500 is removed from the first channel 320 and the second channel 230, and the baffle 410 is inserted into the first channel 320 and the second channel 230. The periphery of the baffle 410 contacts the inner wall of the mounting ring 200, so that the baffle 410 closes one end opening of the mounting ring 200. At the same time, the rotating rod 421 is inserted into the rotating groove 330, and the locking block 423 is close to the locking groove 424. The spring 422 drives the locking block 423 to move and insert into the locking groove 424, so that the rotating rod 421 is stably connected to the connecting plate 300. After the baffle 410 closes one end of the mounting ring 200, the connecting plate 300 is removed from the side wall of the flue pipe 110 and the mounting ring 200 is removed from the flue pipe 110. This facilitates the cleaning and replacement of the filter plate 600. When removing the filter plate 600, the baffle 410 closes the opening at one end of the mounting ring 200 to reduce the pollution caused by impurities falling into the flue pipe 110 and facilitate the cleaning of impurities.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An air preheater, comprising a preheater body (100), wherein the preheater body (100) is connected to a flue gas inlet pipe (110), a flue gas outlet pipe (120), an air inlet pipe (130), and an air outlet pipe (140), characterized in that: A filter plate (600) is detachably connected inside the smoke inlet pipe (110). A connection port (150) is provided on the inner wall of one end of the smoke inlet pipe (110). The connection port (150) is used for the filter plate (600) to pass through. The filter plate (600) is inserted into the smoke inlet pipe (110) through the connection port (150).

2. An air preheater according to claim 1, characterized in that: An installation ring (200) is detachably connected inside the flue gas inlet pipe (110). The filter plate (600) is connected to the inner wall of the installation ring (200). The connection port (150) is used for the installation ring (200) to pass through. An opening and closing assembly (400) is connected to the end of the installation ring (200) away from the preheater body (100). The opening and closing assembly (400) is used to open or open one end of the installation ring (200).

3. An air preheater according to claim 2, characterized in that: One end of the mounting ring (200) is connected to a connecting plate (300), the connecting plate (300) is used to cover the connection port (150), and the connecting plate (300) is detachably connected to the smoke inlet pipe (110).

4. An air preheater according to claim 3, characterized in that: The opening and closing assembly (400) includes a baffle (410) and a connector (420). The connecting plate (300) has a first channel (320) for the baffle (410) to pass through. The mounting ring (200) has a second channel (230) for the baffle (410) to pass through on the inner wall of one end near the connecting plate (300). The first channel (320) and the second channel (230) are connected. The baffle (410) is detachably connected to the mounting ring (200) through the connector (420). The connecting plate (300) is detachably connected to a sealing block (500). The sealing block (500) is used to seal the first channel (320) and the second channel (230) when the preheater body (100) is in operation.

5. An air preheater according to claim 4, characterized in that: The connecting plate (300) has a rotating groove (330) at the end away from the mounting ring (200). The connecting piece (420) includes a rotating rod (421), a spring (422), and a locking block (423). The length direction of the rotating rod (421) is consistent with the depth direction of the first channel (320). One end of the rotating rod (421) is rotatably connected to the baffle (410), and the rotating rod (421) is rotatably connected inside the rotating groove (330). The inner wall of the rotating groove (330) has an installation groove (331). The length direction of the installation groove (331) is consistent with the radial direction of the rotating rod (421). One end of the spring (422) is connected to the installation groove (331). The spring (422) is connected to the locking block (423) at one end. The locking block (423) slides and fits into the inner wall of the mounting groove (331). The rotating rod (421) has a locking groove (424) on its periphery. The spring (422) is used to drive the locking block (423) to move and drive the locking block (423) to insert into the locking groove (424). The locking block (423) is inserted into the rotating rod (421) through the locking groove (424). The locking block (423) has a first guide surface (425) at one end of the periphery of the rotating rod (421). The first guide surface (425) is used to guide the locking block (423) away from the locking groove (424).

6. An air preheater according to claim 2, characterized in that: The outer wall of the mounting ring (200) is connected to a limiting block (210). The inner wall of one side of the smoke inlet pipe (110) is provided with a limiting groove (111) for the limiting block (210) to be inserted. The length direction of the limiting groove (111) is consistent with the depth direction of the connection port (150). The limiting block (210) slides along the depth direction of the connection port (150) and fits into the limiting groove (111).

7. An air preheater according to claim 2, characterized in that: The mounting ring (200) is connected to a plug (220) on the outer wall of the end away from the connecting plate (300). The smoke inlet pipe (110) is provided with a slot (112) on the inner wall of the end away from the connecting port (150). The depth direction of the slot (112) is consistent with the depth direction of the connecting port (150). The plug (220) is inserted into the inner wall of the smoke inlet pipe (110) through the slot (112).

8. An air preheater according to claim 3, characterized in that: A handle (310) is connected to the end of the connecting plate (300) away from the mounting ring (200).

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