Steam air preheater

Abstract

The utility model relates to a steam air preheater which comprises a shell, an air inlet cover and an air outlet cover are arranged at the two ends of the shell, a plurality of heat exchange pipes allowing air to flow are arranged in the shell, a plurality of steam pipelines allowing steam to flow are arranged outside the shell, one end of the air inlet cover is communicated with a gas treatment box, and a filter plate is arranged in the gas treatment box. A plurality of filtering holes used for intercepting solid impurities are formed in the filtering plate, when gas penetrates through the filtering holes, the solid impurities in the gas are blocked by the filtering plate, the cleanliness of the gas entering the shell is improved, and therefore the content of the solid impurities in the gas is reduced, and the possibility that the heat exchange effect is poor due to the fact that the impurities adhere to the inner walls of the heat exchange pipes is reduced; the air pre-heater has the effect of improving the heat exchange efficiency of the air pre-heater.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air preheaters, in particular to a steam air preheater. BACKGROUND

[0002] The steam-air preheater is a heat exchange device using steam as a heat source, and its working principle is that steam is introduced into a steam pipeline, the steam releases heat and condensate is discharged from the steam pipeline outlet, and a heated medium (gas) is introduced into a heat exchange pipe by a fan, absorbs heat in the heat exchange pipe, and is discharged after being heated to a specified temperature.

[0003] However, the gas introduced into the heat exchange pipe is generally boiler flue gas or flue gas after waste incineration, and most of these gases contain a large amount of solid impurities. When the gas flows in the heat exchange pipe, the solid impurities adhere to the inner wall of the heat exchange pipe, thereby increasing the wall thickness of the heat exchange pipe and reducing the heat exchange efficiency between the gas and the steam, thereby reducing the heat exchange efficiency of the air preheater, which has obvious defects. CONTENT OF THE UTILITY MODEL

[0004] In order to improve the heat exchange efficiency of the air preheater, the application provides a steam air preheater.

[0005] The steam air preheater provided by the application adopts the following technical scheme:

[0006] The steam air preheater comprises a shell, air inlets and air outlets are arranged at two ends of the shell, a plurality of heat exchange pipes for gas flow are arranged in the shell, a plurality of steam pipelines for steam flow are arranged outside the shell, a gas treatment box is in communication with one end of the air inlet, a filter plate is arranged in the gas treatment box, and a plurality of filter holes for intercepting solid impurities are formed in the filter plate.

[0007] Through the above technical scheme, the gas passes through the filter plate before entering the shell, and the solid impurities in the gas are blocked by the filter plate when the gas passes through the filter holes. The cleanliness of the gas entering the shell is improved, so that the content of the solid impurities in the gas is reduced, and the possibility of poor heat exchange caused by the adhesion of the impurities to the inner wall of the heat exchange pipe is reduced, thereby improving the heat exchange efficiency of the air preheater.

[0008] Optionally, a water collecting tank is in communication with the water outlet of the steam pipeline, a water delivery pipe is arranged on the outer side wall of the water collecting tank, a water pump is arranged on the water delivery pipe, one end of the water delivery pipe extends into the gas treatment box and is in communication with a water outlet pipe, a plurality of spray heads are arranged on the water outlet pipe, and the water outlet direction of the spray heads is arranged towards the filter plate.

[0009] By adopting the technical scheme, the high-temperature steam is condensed into condensed water after heat exchange, the condensed water is gathered in the water collecting tank from the water outlet of the steam pipeline, under the action of the water pump, the condensed water flows into the water outlet pipe and is sprayed from the spray head to the filter plate, when the water flow passes through the filter hole, the water flow flushes out the impurities firmly adhered to the side wall of the filter hole from the filter plate, the possibility of the filter hole being blocked by the impurities is reduced, and then the gas concentration entering the inside of the shell per unit time is improved, and the heat exchange efficiency of the air preheater is improved.

[0010] Optionally, the water outlet pipe is provided with a connecting block, a screw rod is rotatably connected inside the gas treatment box, the connecting block is screw-connected to the screw rod, a motor is arranged on the outer side wall of the gas treatment box, and an output shaft of the motor is fixedly connected to the screw rod.

[0011] By adopting the technical scheme, the operator starts the motor, the screw rod rotates to drive the connecting block to move along the length direction of the screw rod, the connecting block drives the water outlet pipe to move on the surface of the filter plate, and the filter plate is completely cleaned in the movement process of the water outlet pipe.

[0012] Optionally, the gas treatment box is provided with a mounting frame, the filter plate is slidingly arranged in the mounting frame, the gas treatment box is provided with a dust shaking assembly, the dust shaking assembly comprises a connecting plate arranged on the filter plate, one side of the connecting plate is provided with a cam, the cam abuts against the connecting plate, the mounting frame is provided with a spring, one end of the spring is connected to the inner side wall of the mounting frame, and the other end of the spring is connected to the filter plate, and the gas treatment box is provided with a driving assembly for driving the cam to rotate.

[0013] By adopting the technical scheme, under the driving of the driving assembly, the cam rotates, when the protruding part of the cam contacts the connecting plate, the connecting plate drives the filter plate to move towards the direction of the spring, when the protruding part of the cam is away from the first baffle, the spring drives the filter plate to move away from the direction of the spring, thereby realizing the left-right movement of the filter plate in the gas treatment box, making the filter plate vibrate, and making the impurities not firmly adsorbed on the filter plate fall into the bottom of the gas treatment box, thereby reducing the possibility of the filter hole and the filter plate being blocked by impurities, avoiding the impurities not firmly adsorbed being brought into the inside of the shell when the gas passes through the filter hole, thereby further reducing the content of the impurities in the gas, and improving the heat exchange efficiency of the air preheater.

[0014] Optionally, the driving assembly comprises a first bevel gear fixedly connected to the screw rod, a second bevel gear is meshingly arranged on the first bevel gear, and the second bevel gear is fixedly connected to the rotating shaft of the cam.

[0015] By adopting the above technical solution, when the operator starts the motor, the screw rotates, driving the first bevel gear to rotate, and the first bevel gear drives the second bevel gear to rotate, thereby realizing the rotation of the cam and thus realizing the operation of the ash-shocking assembly.

[0016] Optionally, a filter plate is provided below the outlet of the steam pipe, and the filter plate is slidably disposed in the water collection tank.

[0017] By adopting the above technical solution, the filter plate in the water collection tank can effectively filter impurities in the condensate, reducing the impurity content of the condensate used to clean the filter plate, thereby ensuring the cleaning effect of the condensate on the filter plate and avoiding the accumulation of impurities on the filter plate.

[0018] Optionally, the outer wall of the water collection tank has an opening, the inner wall of the water collection tank has a groove communicating with the opening, the side wall opposite the filter plate has a protrusion that slides with the groove, and the filter plate has a handle.

[0019] By adopting the above technical solution, when there are too many impurities on the filter plate, the operator can pull the handle to remove the filter plate from the water collection tank for cleaning or replacement, thereby avoiding the situation where the filter plate is blocked and the amount of condensate stored is reduced, and ensuring the cleaning effect of condensate on the filter plate.

[0020] Optionally, the bottom surface of the gas treatment box is provided with a drainage groove, and the gas treatment box is provided with a dust collection box that communicates with the drainage groove.

[0021] By adopting the above technical solution, the setting of the diversion channel and the ash collection box facilitates the centralized collection and treatment of particulate impurities shaken off and washed out, avoiding the accumulation of impurities at the bottom of the gas treatment box and affecting the subsequent air intake.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. This application sets up a filter plate, which can filter the gas. Solid impurities in the gas are blocked by the filter holes, and the cleanliness of the gas entering the shell is improved, thereby reducing the content of solid impurities in the gas. The possibility of impurities adhering to the inner wall of the heat exchange tube and causing poor heat exchange effect is reduced, thereby improving the heat exchange efficiency of the air preheater.

[0024] 2. This application, by setting up a water pump, a water collection tank, a water outlet pipe, a nozzle, and a screw, allows the condensate from the high-temperature steam to be sprayed from the nozzle onto the filter plate under the pumping action of the water pump. Under the action of the screw, the water outlet pipe moves along the surface of the filter plate. After being washed by the condensate, the filter plate is less likely to be blocked by impurities, thereby increasing the gas concentration entering the shell per unit time and improving the heat exchange efficiency of the air preheater.

[0025] 3. This application sets up a drive component and a dust-shock component. The drive component drives the dust-shock component to work, so that the impurities that are not firmly adsorbed on the filter plate are shaken off and fall into the bottom of the gas treatment box. This avoids the gas from carrying the impurities that are not firmly adsorbed into the shell when passing through the filter holes, thereby reducing the impurity content in the gas and improving the heat exchange efficiency of the air preheater. Attached Figure Description

[0026] Figure 1 This is a structural diagram of this application.

[0027] Figure 2 This is a cross-sectional view of the gas processing box in an embodiment of this application.

[0028] Figure 3 This is an exploded view of the water collection tank and the filter plate in an embodiment of this application.

[0029] Figure 4 This is a cross-sectional view of the mounting frame in an embodiment of this application.

[0030] Figure 5 This is an embodiment of the present application. Figure 2 Enlarged view of point A in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Base; 2. Housing; 21. Air inlet hood; 22. Air outlet hood; 23. Steam pipe; 3. Gas handling box; 31. Slide groove; 32. Motor; 33. Drainage groove; 34. Ash collection box; 35. Mounting frame; 4. Filter plate; 41. Filter hole; 5. Water collection tank; 51. Opening; 52. Groove; 6. Water supply pipe; 61. Water pump; 7. Water outlet pipe; 71. Nozzle; 72. Connecting block; 8. Screw; 9. Water filter plate; 91. Raised strip; 92. Handle; 10. Ash removal assembly; 101. Cam; 102. Connecting plate; 103. Spring; 11. Drive assembly; 111. First bevel gear; 112. Second bevel gear. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0033] This application discloses a steam-air preheater.

[0034] Reference Figure 1A steam-air preheater includes a base 1, on which a shell 2 is fixedly connected. An air inlet hood 21 is fixedly connected to one end of the shell 2, and an air outlet hood 22 is fixedly connected to the other end. Multiple heat exchange tubes (not shown in the figure) are installed inside the shell 2. Multiple steam pipes 23 connected to the shell 2 are installed on the upper and lower sides of the outer surface of the shell 2. A gas processing box 3 is fixedly connected to the end of the air inlet hood 21 away from the shell 2. A filter plate 4 is provided inside the gas processing box 3. The filter plate 4 has multiple filter holes 41 for intercepting solid impurities.

[0035] When the preheater is working, gas enters the interior from the air inlet of the gas handling box 3. As the gas passes through the filter holes 41 on the filter plate 4, solid impurities in the gas are blocked on the side of the filter plate 4 near the air inlet. The filtered gas exchanges heat with the high-temperature steam in the steam pipe 23 in the heat exchange tube of the shell 2. After the gas is heated to the specified temperature, it is discharged from the air outlet hood 22. The high-temperature steam condenses into condensate and is discharged from the water outlet of the steam pipe 23. In the entire heat exchange process, because the gas passes through the filter plate 4, the content of solid impurities in the gas is reduced, and the possibility of particulate impurities adhering to the inner wall of the heat exchange tube and causing poor heat exchange effect is reduced, thereby improving the heat exchange efficiency of the air preheater.

[0036] Reference Figure 1 and Figure 2 A water collection tank 5 is fixedly installed on the base 1. The water collection tank 5 is connected to the outlet of the steam pipe 23. When the high-temperature steam condenses into condensate, the condensate flows along the steam pipe 23 and eventually collects in the water collection tank 5. A water supply pipe 6 is installed on the outer wall of the water collection tank 5. A water pump 61 is installed on the water supply pipe 6. One end of the water supply pipe 6 passes through the side wall of the gas treatment box 3 and extends into the interior. The end of the water supply pipe 6 is connected to an outlet pipe 7. The length direction of the outlet pipe 7 is perpendicular to the flow direction of the gas. Multiple nozzles 71 are evenly distributed on the outlet pipe 7. The water outlet direction of the nozzles 71 is set towards the filter plate 4.

[0037] Under the action of water pump 61, condensate flows along water supply pipe 6 to water outlet pipe 7 and is sprayed from nozzle 71 onto filter plate 4. When the water flows through filter hole 41, the water flow washes out the impurities that are firmly attached to the filter hole 41 from the filter plate 4, thereby reducing the possibility of the filter hole 41 being blocked by firmly attached impurities, thereby increasing the gas concentration entering the shell 2 per unit time and improving the heat exchange efficiency of the air preheater.

[0038] Reference Figure 1 and 2The water outlet pipe 7 is slidably installed inside the gas treatment box 3. Connecting blocks 72 are fixedly installed at both the upper and lower ends of the water outlet pipe 7. The top of the gas treatment box 3 is rotatably connected to the screw 8. The connecting block 72 near the screw 8 is threadedly connected to the screw 8. The bottom of the gas treatment box 3 is provided with a sliding groove 31. The connecting block 72 near the sliding groove 31 is slidably connected inside the sliding groove 31. A motor 32 is fixedly installed on the outer wall of the gas treatment box 3. The output shaft of the motor 32 extends into the gas treatment box 3 and is fixedly connected to the screw 8.

[0039] After the operator starts the motor 32, the screw 8 rotates, thereby driving the connecting block 72 to move along the length of the screw 8. The connecting block 72 carries the water outlet pipe 7 and moves on the surface of the filter plate 4. During the movement of the water outlet pipe 7, the filter plate 4 is thoroughly cleaned.

[0040] Reference Figure 2 The bottom surface of the gas treatment box 3 is provided with a diversion groove 33, which is located on the side of the filter plate 4 near the air inlet of the gas treatment box 3. A dust collection box 34 that is connected to the diversion groove 33 is slidably provided on the bottom surface of the gas treatment box 3.

[0041] Guided by the diversion channel 33, the impurities on the filter plate 4 are washed by the condensate and then collected in the ash collection box 34. The operator can pull out the ash collection box 34 to collect and process the washed-off impurities, so as to avoid the accumulation of impurities at the bottom of the gas treatment box 3 and affect the subsequent air intake.

[0042] Reference Figure 3 An opening 51 is provided on the outer side wall of the water collection tank 5. A filter plate 9 is slidably connected in the opening 51. A groove 52 communicating with the opening 51 is provided on the opposite side wall of the water collection tank 5. A protrusion 91 corresponding to the groove 52 is fixedly connected to the opposite outer side wall of the filter plate 9. The protrusion 91 is slidably connected in the groove 52. A handle 92 is fixedly connected to one end of the filter plate 9.

[0043] The filter plate 9 in the water collection tank 5 can effectively filter impurities in the condensate, reducing the impurity content of the condensate used to clean the filter plate 4, thus ensuring the cleaning effect of the condensate on the filter plate 4 and preventing the accumulation of impurities on the filter plate 4. When there are too many impurities on the filter plate 9, the operator can pull the handle 92 to pull the filter plate 9 out of the water collection tank 5 for cleaning or replacement, thus avoiding the situation where the filter plate 9 is blocked and the condensate storage volume is reduced, and ensuring the cleaning effect of the condensate on the filter plate 4.

[0044] Reference Figure 4 and Figure 5A mounting frame 35 is fixedly connected inside the gas treatment box 3. The filter plate 4 is slidably disposed inside the mounting frame 35. A dust-removing assembly 10 is disposed inside the gas treatment box 3. Specifically, the dust-removing assembly 10 includes a cam 101 rotatably disposed inside the gas treatment box 3. One end of the cam 101 abuts against a connecting plate 102. The connecting plate 102 is fixedly mounted on the filter plate 4. A plurality of springs 103 are disposed inside the mounting frame 35. One end of the spring 103 is fixedly connected to the inner wall of the mounting frame 35, and the other end is fixedly connected to the filter plate 4.

[0045] The gas handling box 3 is equipped with a drive assembly 11. Specifically, the drive assembly 11 includes a first bevel gear 111 fixedly connected to the screw 8, a second bevel gear 112 meshing on the first bevel gear 111, and the second bevel gear 112 fixedly connected to the rotation shaft of the cam 101.

[0046] Initially, the protruding end of cam 101 abuts against connecting plate 102, and spring 103 is compressed. When the operator starts motor 32, screw 8 rotates, driving first bevel gear 111 to rotate, which in turn drives second bevel gear 112 to rotate, thus realizing the rotation of cam 101. When the protruding end of cam 101 moves away from connecting plate 102, under the elastic force of spring 103, filter plate 4 moves away from spring 103. When the protruding end of cam 101 rotates again to abut against connecting plate 102... When the filter plate 4 moves toward the direction of the spring 103 and compresses the spring 103, the filter plate 4 moves left and right within the mounting frame 35. During the movement, the filter plate 4 itself vibrates, causing the impurities that are not firmly adsorbed on the filter plate 4 to be shaken off and fall into the bottom of the gas treatment box 3. This reduces the possibility of impurities accumulating on the filter holes 41 and prevents the gas from carrying the impurities that are not firmly adsorbed into the interior of the shell 2 when passing through the filter holes 41. This further reduces the impurity content in the gas and improves the heat exchange efficiency of the air preheater.

[0047] The implementation principle of a steam-air preheater according to an embodiment of this application is as follows: When the preheater is working, gas enters the interior from the air inlet of the gas handling box 3. When the gas passes through the filter holes 41 on the filter plate 4, solid impurities in the gas are blocked on the side of the filter plate 4 near the air inlet. The filtered gas exchanges heat with the high-temperature steam in the steam pipe 23 in the heat exchange tube of the shell 2. After the gas is heated to a specified temperature, it is discharged from the air outlet hood 22. The high-temperature steam condenses into condensate and is discharged from the water outlet of the steam pipe 23. In the entire heat exchange process, because the gas passes through the filter plate 4, the content of solid impurities in the gas becomes lower, and the possibility of particulate impurities adhering to the inner wall of the heat exchange tube and causing poor heat exchange effect is reduced, thereby improving the heat exchange efficiency of the air preheater.

[0048] When condensate accumulates inside the water collection tank 5, the water pump 61 and motor 32 are started. The condensate is sprayed from the nozzle 71 of the outlet pipe 7 through the water supply pipe 6 onto the filter plate 4. Driven by the motor 32, the screw 8 rotates, causing the outlet pipe 7 to move along the surface of the filter plate 4, thus achieving a thorough rinsing of the filter plate 4. At the same time, the rotation of the screw 8 also drives the first bevel gear 111 to rotate, which in turn drives the second bevel gear 112 to rotate. The second bevel gear 112 drives the cam 101 to rotate. The cam 101, in conjunction with the reset action of the spring 103, enables the filter plate 4 to move left and right within the mounting frame 35. During the movement, impurities adhering to the filter plate 4 are shaken off. The impurities shaken off and washed away are finally collected in the dust collection box 34. When there are too many impurities in the dust collection box 34, the operator can remove the dust collection box 34 to remove the 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. A steam-air preheater, comprising a shell (2), both ends of which are provided with an air inlet hood (21) and an air outlet hood (22), the inside of the shell (2) is provided with a plurality of heat exchange pipes for gas flow, and the outside of the shell (2) is provided with a plurality of steam pipes (23) for steam flow, characterized in that, One end of the air inlet cover (21) is provided with a gas treatment box (3), the gas treatment box (3) is provided with a filter plate (4), a plurality of filter holes (41) for intercepting solid impurities are formed in the filter plate (4).

2. A steam-air preheater according to claim 1, characterised in that The water outlet of the steam pipeline (23) is provided with a water collecting tank (5), the outer side wall of the water collecting tank (5) is provided with a water conveying pipe (6), the water conveying pipe (6) is provided with a water pump (61), one end of the water conveying pipe (6) extends into the gas treatment box (3) and is provided with a water outlet pipe (7), the water outlet pipe (7) is provided with a plurality of spray heads (71), and the water outlet direction of the spray heads (71) is arranged towards the filter plate (4).

3. A steam-air preheater according to claim 2, characterised in that The water outlet pipe (7) is provided with a connecting block (72), the screw rod (8) is rotatably connected in the gas treatment box (3), the connecting block (72) is screw-connected on the screw rod (8), the outer side wall of the gas treatment box (3) is provided with a motor (32), and the output shaft of the motor (32) is fixedly connected with the screw rod (8).

4. A steam-air preheater according to claim 3, characterised in that The gas treatment box (3) is provided with a mounting frame (35), the filter plate (4) is slidably arranged in the mounting frame (35), the gas treatment box (3) is provided with a dust shaking assembly (10), the dust shaking assembly (10) comprises a connecting plate (102) arranged on the filter plate (4), one side of the connecting plate (102) is provided with a cam (101), the cam (101) abuts against the connecting plate (102), the mounting frame (35) is provided with a spring (103), one end of the spring (103) is connected to the inner side wall of the mounting frame (35), and the other end of the spring (103) is connected to the filter plate (4), and the gas treatment box (3) is provided with a driving assembly (11) for driving the cam (101) to rotate.

5. A steam-air preheater according to claim 4, characterised in that The driving assembly (11) comprises a first bevel gear (111) fixedly connected to the screw rod (8), the first bevel gear (111) is provided with a second bevel gear (112) in meshing, and the second bevel gear (112) is fixedly connected to the rotating shaft of the cam (101).

6. A vapour air preheater according to claim 5, characterised in that The water outlet of the steam pipeline (23) is provided with a filter plate (9), and the filter plate (9) is slidably arranged in the water collecting tank (5).

7. A vapour air preheater according to claim 6, characterised in that An opening (51) is formed in the outer side wall of the water collecting tank (5), a groove (52) in communication with the opening (51) is formed in the inner side wall of the water collecting tank (5), a convex strip (91) in sliding fit with the groove (52) is arranged on the side wall opposite to the filter plate (9), and a handle (92) is arranged on the filter plate (9).

8. A steam-air preheater according to claim 1, characterized in that The bottom surface of the gas treatment box (3) is provided with a drainage groove (33), and the gas treatment box (3) is provided with a dust collecting box (34) in communication with the drainage groove (33).

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