Air preheater with ash cleaning function

Abstract

The application relates to an air preheater with ash removal function, which comprises an air preheater body, a cleaning disc, a driving member and a gas expansion member, a plurality of vertical flue pipes are uniformly arranged in the air preheater body, the cleaning disc is slidably connected in the air preheater body in the vertical direction, a plurality of cleaning holes are formed in the cleaning disc, the cleaning holes are used for passing the flue pipes, rubber rings are arranged in the cleaning holes, the gas expansion member is used for inflating the space between the rubber rings and the cleaning holes and making the rubber rings adhere to the surfaces of the flue pipes, and the driving member is used for driving the cleaning disc to move. The application has the effect of removing the dust on the surfaces of the flue pipes without damaging the surfaces of the flue pipes.

Description

Technical Field

[0001] This application relates to the field of air preheaters, and more particularly to an air preheater with a dust removal function. Background Technology

[0002] Air preheaters are energy-saving auxiliary equipment commonly used in industrial boilers, power plant boilers and other thermal equipment. They utilize the waste heat of the high-temperature flue gas discharged from the tail end of the boiler to preheat the cold air entering the boiler furnace. The preheated air is then sent into the furnace to participate in combustion, thus realizing the function of waste heat recovery and improving fuel efficiency.

[0003] Currently, Chinese utility model patent CN220567288U discloses an air preheater with good anti-clogging effect, including a preheater body. Multiple flue pipes are fixed between the upper and lower sides of the preheater body's inner cavity. A cleaning mechanism is provided on the upper surface of the preheater body, including a cleaning plate movable relative to the flue pipes, which abuts against the surface of the flue pipes. A dust suction mechanism is provided on the lower surface of the preheater body, including a housing fixed to the lower surface of the preheater body. A filter screen is fixed to the inner wall of the housing. The dust suction mechanism also includes multiple first suction pipes fixed to the lower surface of the preheater body's inner cavity. Two fans and four support legs are fixed to the lower surface of the housing. This patent effectively reduces dust adhesion to the flue pipes.

[0004] Because dust adheres to the surface of the flue, and the cleaning plate needs to remove the dust from the surface of the flue, the cleaning plate needs to move relative to the flue, which can easily cause scratches on the surface of the flue and greatly shorten the service life of the flue. Utility Model Content

[0005] In order to remove dust from the surface of the flue without damaging the surface of the flue, this application provides an air preheater with a dust removal function.

[0006] This application provides an air preheater with a dust removal function, which adopts the following technical solution: An air preheater with a dust removal function includes an air preheater body, a cleaning disc, a drive component, and an expansion component. Several vertical flue pipes are evenly arranged inside the air preheater body. The cleaning disc is slidably connected to the air preheater body in a vertical direction. Several cleaning holes are opened on the cleaning disc for the flue pipes to pass through. A rubber ring is placed inside the cleaning hole. The expansion component is used to inflate the space between the rubber ring and the cleaning hole and make the rubber ring fit against the surface of the flue pipe. The drive component is used to drive the cleaning disc to move.

[0007] By adopting the above technical solution, a cleaning disc with cleaning holes and a rubber ring is set in the air preheater body. The rubber ring is made to fit the surface of the flue pipe with the expansion component, and the cleaning disc is moved by the drive component. This can not only efficiently remove the dust adsorbed on the surface of the flue pipe, but also avoid scratching the flue pipe with the flexible contact of the rubber ring, thus ensuring the service life of the flue pipe. At the same time, it can achieve both the dust removal function and equipment protection.

[0008] Optionally, the rubber ring is made of fluororubber.

[0009] By adopting the above technical solution, using fluororubber rubber rings, which utilize the high temperature resistance, wear resistance, and corrosion resistance of fluororubber, the high-temperature working environment of the air preheater is adapted to extend the service life of the rubber rings and ensure the stability of the fit to the flue and the continuity of the cleaning effect during the dust removal process.

[0010] Optionally, the cleaning disc has a cavity, and the inner wall of the cleaning hole has a plurality of connecting holes distributed circumferentially along the axis of the cleaning hole. The connecting holes communicate with the cavity, and the inflator is used to change the air pressure inside the cavity.

[0011] By adopting the above technical solution, by opening a cavity in the cleaning disc and setting circumferentially distributed connecting holes on the inner side wall of the cleaning hole that communicate with the cavity, when the air inflator inflates the cavity, the air pressure can be evenly transmitted to all parts of the rubber ring, making the rubber ring fit more tightly and evenly with the surface of the flue, improving the comprehensiveness and thoroughness of dust removal, and avoiding the situation of incomplete local cleaning.

[0012] Optionally, the inflatable component includes an inflatable strip and an adjusting bolt. The cleaning disc has an opening on one side wall. The inflatable strip is slidably connected to the opening of the cleaning disc along the opening direction. The length direction of the adjusting bolt is parallel to the sliding direction of the inflatable strip. One end of the adjusting bolt is rotatably connected to the cleaning disc. The inflatable strip is threadedly connected to the adjusting bolt.

[0013] By adopting the above technical solution, the air expansion component consists of an air expansion strip and an adjusting bolt. By rotating the adjusting bolt, the air expansion strip can be moved to precisely adjust the air pressure in the cavity of the cleaning disc, thereby controlling the adhesion between the rubber ring and the flue. This not only adjusts the cleaning intensity according to the degree of dust adhesion, but also avoids excessive movement resistance or damage to the rubber ring caused by excessive tightness, thus improving the flexibility and reliability of use.

[0014] Optionally, both sides of the rubber ring are provided with a fitting ring, which is coaxially arranged with the rubber ring. The fitting ring is used to fit the end face of the cleaning disc, and the cleaning disc is provided with a limiting member to prevent the fitting ring from detaching from the cleaning disc.

[0015] By adopting the above technical solution, fitting rings are set on both sides of the rubber ring, which, together with the limiting components on the cleaning disc, can effectively limit the displacement of the rubber ring in the cleaning hole, prevent the rubber ring from shifting or falling off when the cleaning disc moves to clean the ash, ensure the stable fit between the rubber ring and the flue, and ensure the smooth progress of the ash cleaning process.

[0016] Optionally, the limiting component includes a limiting ring and an abutting ring. The limiting ring is coaxially arranged with the cleaning hole and is disposed on the cleaning disc. The abutting ring is coaxially arranged with the limiting ring. The outer side wall of the abutting ring is threadedly connected to the inner side wall of the limiting ring. The abutting ring is used to fit the end face of the ring away from the cleaning disc.

[0017] By adopting the above technical solution, the limiting ring and the abutment ring are connected by threads. The abutment ring fits into the fitting ring of the rubber ring, which can not only stabilize the limiting rubber ring, but also make it easy to replace the worn rubber ring by disassembling the abutment ring, reducing maintenance difficulty and cost. At the same time, the threaded connection structure ensures the firmness of the limit and avoids loosening during the dust cleaning process.

[0018] Optionally, a slot is provided on the end face of the abutment ring to facilitate the tightening of the bolt.

[0019] By adopting the above technical solution, a slot is opened on the end face of the abutment ring, providing a convenient force point for tightening the bolts, making it easy for operators to quickly disassemble and install the abutment ring, improving the efficiency of rubber ring replacement and equipment maintenance, and reducing the impact on other parts of the equipment during maintenance.

[0020] Optionally, the driving component includes a driving screw and a driving motor. The length direction of the driving screw is parallel to the sliding direction of the cleaning disc. The driving screw is rotatably connected to the air preheater body, and the cleaning disc is threadedly connected to the driving screw. The driving motor is used to drive the driving screw to rotate.

[0021] By adopting the above technical solution, the driving component uses a drive screw and a drive motor. The drive motor drives the drive screw to rotate, which in turn drives the threaded cleaning disc to slide smoothly. It can accurately control the moving speed and stroke of the cleaning disc, ensuring that the dust removal process is stable and controllable, avoiding jamming or shaking during movement, and ensuring the uniformity of dust removal when the rubber ring contacts the flue. At the same time, the motor drive method has a high degree of automation, reducing the intensity of manual operation and improving the efficiency and convenience of dust removal operations.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The cleaning disc features a cleaning hole with a rubber ring. The expansion component allows the rubber ring to flexibly fit the flue. When the drive component moves the cleaning disc, it can thoroughly remove dust from the surface of the flue, reduce scratches on the flue, significantly extend the service life of the flue, and ensure that the waste heat recovery efficiency is not affected by dust accumulation. 2. The air pressure transmission structure through the cavity and circumferential connecting holes allows the rubber ring to fit more evenly with the flue, avoiding dead corners for cleaning. With the help of the combination of the expansion strip and the adjusting bolt, the bonding force of the rubber ring can be precisely adjusted according to the dust adhesion. 3. The fitting ring, limiting ring, and abutment ring can effectively fix the rubber ring and facilitate its disassembly and replacement. The slot on the abutment ring further simplifies the abutment ring disassembly and assembly process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an air preheater with a dust removal function.

[0024] Figure 2 yes Figure 1 A schematic diagram of the drive component.

[0025] Figure 3 yes Figure 2 Structural view of the cleaning disk.

[0026] Figure 4 yes Figure 3 The enlarged view at point A in the middle is used to show the structure of the limiting component.

[0027] Reference numerals: 1. Air preheater body; 11. Flue pipe; 2. Cleaning disc; 21. Cleaning hole; 22. Cavity; 23. Connecting hole; 3. Driving component; 31. Driving screw; 32. Driving motor; 4. Inflating component; 41. Inflating strip; 42. Adjusting bolt; 5. Rubber ring; 51. Fitting ring; 6. Limiting component; 61. Limiting ring; 62. Abutting ring; 63. Slotted groove. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail.

[0029] This application discloses an air preheater with a dust removal function. (Refer to...) Figure 1 and Figure 2 An air preheater with a dust removal function includes an air preheater body 1, a cleaning disc 2, a drive component 3, and an expansion component 4. The air preheater body 1 is square tubular, and a plurality of flue pipes 11 are evenly arranged inside the air preheater body 1. The flue pipes 11 are vertically arranged, and the two ends of the flue pipes 11 abut against the upper end face and the lower end face of the inner side wall of the air preheater body 1, respectively. The cleaning disc 2 is horizontally arranged. The drive component 3 includes a drive screw 31 and a drive motor 32. The drive screw 31 is vertically arranged and rotatably connected to the air preheater body 1. The cleaning disc 2 is threadedly connected to the drive screw 31. The drive motor 32 is fixedly arranged on the air preheater body 1, and the output end of the drive motor 32 is fixedly connected to the drive screw 31.

[0030] refer to Figure 3 and Figure 4 The cleaning disc 2 has several cleaning holes 21, which correspond to several smoke pipes 11. The cleaning holes 21 are fitted onto the corresponding smoke pipes 11. A rubber ring 5 is provided on the cleaning hole 21. The rubber ring 5 is made of fluororubber. The expansion component 4 is used to drive the inner side wall of the rubber ring 5 to fit against the surface of the smoke pipe 11. The driving component 3 is used to drive the cleaning disc 2 to move in the vertical direction.

[0031] refer to Figure 3 and Figure 4 The cleaning disc 2 has a cavity 22 inside. Several connecting holes 23 are formed on the inner wall of the cleaning hole 21. These connecting holes 23 are evenly distributed circumferentially along the axis of the cleaning hole 21 and extend radially along the cleaning hole 21. The connecting holes 23 communicate with the cavity 22. The rubber ring 5 has an arched cross-section, which covers the connecting holes 23. Both sides of the rubber ring 5 are provided with fitting rings 51 made of fluororubber. The fitting rings 51 are coaxially arranged with the rubber ring 5 and abut against the end face of the cleaning disc 2. Above, a limiting member 6 is provided on the cleaning tray 2 to restrict the contact ring 51 from disengaging from the cleaning tray 2. The limiting member 6 includes a limiting ring 61 and an abutment ring 62. The limiting ring 61 is coaxially arranged with the cleaning tray 2 and is fixedly arranged on the end face of the cleaning tray 2. The abutment ring 62 is coaxially arranged with the limiting ring 61. The outer side wall of the abutment ring 62 is threaded to the inner side wall of the limiting ring 61. A slot 63 is provided on the end face of the abutment ring 62 away from the contact ring 51 to facilitate the turning of a flathead screwdriver. The end of the abutment ring 62 away from the slot 63 is used to press against the contact ring 51.

[0032] refer to Figure 2 and Figure 3 The inflatable component 4 includes an inflatable strip 41 and an adjusting bolt 42. An opening is provided on one side wall of the cleaning disc 2 and communicates with the cavity 22. The inflatable strip 41 is horizontally arranged and blocks the opening of the cleaning disc 2. The inflatable strip 41 slides along the opening direction of the opening of the cleaning disc 2 and is connected to the cleaning disc 2. The length direction of the adjusting bolt 42 is parallel to the sliding direction of the inflatable strip 41. One end of the adjusting bolt 42 is rotatably connected to the cleaning disc 2. The inflatable strip 41 is threadedly connected to the adjusting bolt 42. The inflatable strip 41 is used to change the air pressure in the cavity 22 of the cleaning disc 2.

[0033] The implementation principle of an air preheater with a dust removal function in this application embodiment is as follows: After the equipment is stopped and the temperature of the flue pipe 11 drops to a safe range, the contact state between the cleaning disc 2 and the flue pipe 11 is first adjusted by the expansion component 4: The operator rotates the adjusting bolt 42 of the expansion component 4. Since one end of the adjusting bolt 42 is rotatably connected to the cleaning disc 2 and the other end is threadedly engaged with the expansion strip 41 that seals the opening of the cleaning disc 2, the rotation of the adjusting bolt 42 will drive the expansion strip 41 to slide along the opening direction of the cleaning disc 2, thereby changing the volume and air pressure of the cavity 22 inside the cleaning disc 2.

[0034] The air pressure inside the cavity 22 is transmitted to the rubber ring 5 through the circumferentially distributed connecting holes 23 on the inner wall of the cleaning hole 21. Since the cross-section of the rubber ring 5 is arched and covers the connecting holes 23, the air pressure will push the inner wall of the rubber ring 5 to bulge towards the flue pipe 11 until it fits tightly against the surface of the flue pipe 11, forming a flexible wrapping cleaning contact structure. This ensures that the dust attached to the surface of the flue pipe 11 can be effectively scraped off during subsequent cleaning, and the flexible material of the rubber ring 5 avoids scratching the flue pipe 11 caused by traditional hard contact cleaning.

[0035] After the rubber ring 5 is stably attached to the flue pipe 11, the drive unit 3 is activated to drive the cleaning disc 2 to move vertically along the flue pipe 11: the drive motor 32 outputs power to drive the drive screw 31 fixedly connected to it to rotate. Since the cleaning disc 2 is threadedly connected to the drive screw 31, and the cleaning disc 2 is sleeved on the flue pipe 11 through the cleaning hole 21, the rotation of the screw will be converted into the smooth sliding of the cleaning disc 2 in the vertical direction. During the movement of the cleaning disc 2, the rubber ring 5 that adheres to the flue pipe 11 continuously applies a uniform cleaning force to the dust on the surface of the flue pipe 11, peeling the dust off the surface of the flue pipe 11. At the same time, the fluororubber bonding rings 51 on both sides of the rubber ring 5 remain stable under the action of the limiting member 6. The limiting ring 61 of the limiting member 6 is fixed to the end face of the cleaning disc 2, and the abutting ring 62 is connected to the inner side wall of the limiting ring 61 through the threaded connection of the outer side wall, tightly pressing the bonding ring 51 against the end face of the cleaning disc 2, preventing the rubber ring 5 from shifting or falling off when the cleaning disc 2 moves, ensuring that the cleaning path is consistent with the axis of the flue pipe 11, and achieving uniform dust removal along the entire length of the flue pipe 11.

[0036] After the dust removal operation is completed, the adjusting bolt 42 is rotated in the opposite direction, which causes the air expansion strip 41 to slide away from the cavity 22 of the cleaning disc 2. The air pressure in the cavity 22 decreases, and the rubber ring 5 returns to its original shape under its own elasticity, and disengages from the surface of the flue 11. Then, the drive motor 32 is started in the opposite direction, which drives the cleaning disc 2 to reset to the initial position, completing the single-stop dust removal process.

[0037] 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 with a dust removal function, characterized in that: The device includes an air preheater body (1), a cleaning disc (2), a drive unit (3), and an inflator (4). The air preheater body (1) is evenly provided with several vertical flue pipes (11). The cleaning disc (2) is slidably connected to the air preheater body (1) in the vertical direction. The cleaning disc (2) is provided with several cleaning holes (21). The cleaning holes (21) are for the flue pipes (11) to pass through. A rubber ring (5) is provided in the cleaning hole (21). The inflator (4) is used to inflate the rubber ring (5) and the cleaning hole (21) and make the rubber ring (5) fit against the surface of the flue pipe (11). The drive unit (3) is used to drive the cleaning disc (2) to move.

2. An air preheater with a dust removal function according to claim 1, characterized in that: The rubber ring (5) is made of fluororubber.

3. An air preheater with a dust removal function according to claim 1, characterized in that: The cleaning disc (2) has a cavity (22) inside, and the inner sidewall of the cleaning hole (21) has a number of connecting holes (23). The connecting holes (23) are distributed circumferentially along the axis of the cleaning hole (21). The connecting holes (23) are connected to the cavity (22). The air expansion component (4) is used to change the air pressure inside the cavity (22).

4. An air preheater with a dust removal function according to claim 3, characterized in that: The inflatable component (4) includes an inflatable strip (41) and an adjusting bolt (42). The cleaning disc (2) has an opening on one side wall. The inflatable strip (41) slides along the opening of the cleaning disc (2) and is connected to the opening of the cleaning disc (2). The length direction of the adjusting bolt (42) is parallel to the sliding direction of the inflatable strip (41). One end of the adjusting bolt (42) is rotatably connected to the cleaning disc (2). The inflatable strip (41) is threaded onto the adjusting bolt (42).

5. An air preheater with a dust removal function according to claim 1, characterized in that: Both sides of the rubber ring (5) are provided with a fitting ring (51). The fitting ring (51) is coaxially arranged with the rubber ring (5). The fitting ring (51) is used to fit the end face of the cleaning disc (2). The cleaning disc (2) is provided with a limiting member (6) to prevent the fitting ring (51) from leaving the cleaning disc (2).

6. An air preheater with a dust removal function according to claim 5, characterized in that: The limiting member (6) includes a limiting ring (61) and an abutting ring (62). The limiting ring (61) is coaxially arranged with the cleaning hole (21) and is disposed on the cleaning disc (2). The abutting ring (62) is coaxially arranged with the limiting ring (61). The outer side wall of the abutting ring (62) is threadedly connected to the inner side wall of the limiting ring (61). The abutting ring (62) is used to fit the end face of the ring (51) away from the cleaning disc (2).

7. An air preheater with a dust removal function according to claim 6, characterized in that: The end face of the abutment ring (62) is provided with a slot (63) to facilitate the screwing of the bolt.

8. An air preheater with a dust removal function according to claim 1, characterized in that: The driving component (3) includes a driving screw (31) and a driving motor (32). The length direction of the driving screw (31) is parallel to the sliding direction of the cleaning disc (2). The driving screw (31) is rotatably connected to the air preheater body (1). The cleaning disc (2) is threadedly connected to the driving screw (31). The driving motor (32) is used to drive the driving screw (31) to rotate.

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