Air pre-heater with ash removal device

Abstract

The air pre-heater comprises an upper heat exchange tube box, a lower heat exchange tube box, a front wall plate and a rear wall plate, a first supporting rod and a second supporting rod are arranged in the lower heat exchange tube box, two transverse support assemblies are arranged on the first supporting rod and the second supporting rod, and a connecting frame is arranged between the two transverse support assemblies. A main shaft is arranged above the transverse support assembly, a comb plate assembly is arranged on the main shaft, the horizontal driving device drives the transverse support assembly to move along the first supporting rod and the second supporting rod, and the comb plate assembly comprises a comb plate mounting seat and an upper comb plate and extends towards the upper heat exchange tube box; and the lower comb plate extends towards the direction of the lower heat exchange tube box. According to the air pre-heater with the ash removal device, the upper comb plate and the lower comb plate are small in stress, small in deformation, thorough in ash removal and long in service life.

Description

Technical Field

[0001] The invention belongs to the technical field of cleaning equipment, and in particular relates to an air preheater with a dust cleaning device. Background Art

[0002] Air preheater is an important equipment in boiler system. Its function on boiler is mainly to improve combustion rate, reduce flue gas emission, reduce pollutant emission, reduce corrosion and scaling, etc. Therefore, in modern boiler system, air preheater is a very important energy-saving and environmental protection equipment.

[0003] The air preheater is located inside the flue. Usually, multiple groups of air preheaters are installed in series in the flue. Each group of air preheaters consists of an upper and lower heat exchange tube box in series. The flue gas generated by the combustion of the boiler is obviously corrosive. When it enters the air preheater, the boiler will adhere to the surface of the air preheater heat exchange tube, which will cumulatively hinder the flow of flue gas, increase the risk of corrosion of the preheater pipe, reduce the heating efficiency, and even block the air duct. Therefore, it is usually necessary to use a cleaning comb to clean the dust accumulated between the pipes. At present, the comb plate of the existing cleaning device is too long. The longer the comb plate, the greater the resistance, which causes the comb plate to deform, and the dust accumulated at both ends cannot be cleaned. During the cleaning process, when the comb plate comes into contact with the dust, the dust accumulated on the surface of the pipe will generate resistance to the comb plate. Since the lower end of the comb plate is suspended, the comb plate will be subjected to bending force, causing it to bend and deform. The longer the comb plate, the more serious the deformation, resulting in the dust accumulated at both ends cannot be cleaned. The longer the comb plate, the greater the impact force it receives, causing the comb plate to twist and deform, increasing the running resistance and damaging the heat exchange tube. During the dust cleaning process, the comb plate will impact or collide with the dust accumulated on the surface of the pipe. These impact forces cause the comb plate to vibrate and strain, resulting in local twisting and deformation. Deformation increases the running resistance and damages the heat exchange tube. The longer the comb plate, the greater the bending moment at the root. The alternating load causes fatigue fracture at the root of the fixed end of the comb plate. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned problem and provide an air preheater with a dust cleaning device.

[0005] To achieve the above-mentioned purpose, the present invention provides an air preheater with a dust cleaning device, comprising an upper heat exchange tube box, a lower heat exchange tube box, a front wall panel and a rear wall panel located between the upper heat exchange tube box and the lower heat exchange tube box and fixedly connected to the upper heat exchange tube box and the lower heat exchange tube box respectively, wherein a first support rod and a second support rod are provided in the lower heat exchange tube box, two transverse support assemblies are provided on the upper sides of the first support rod and the second support rod in parallel with each other, a connecting frame is connected between the two transverse support assemblies, a main shaft is provided above the transverse support assembly, a plurality of comb plate assemblies are provided on the main shaft at intervals, and also includes a horizontal driving device, the horizontal driving device is located on the outer side of the front wall panel and connected to the middle of the transverse support assembly, and is used to drive the transverse support assembly to move along the first support rod and the second support rod, and the comb plate assembly includes:

[0006] A comb plate mounting seat, fixedly connected to the main shaft;

[0007] An upper comb plate, fixedly connected to the comb plate mounting seat, extending toward the upper heat exchange tube box;

[0008] A lower comb plate, fixedly connected to the comb plate mounting seat, extending toward the lower heat exchange tube box;

[0009] The upper comb plate and the lower comb plate have a self-cleaning function, and cleaning saw teeth are arranged on the upper comb plate and the lower comb plate.

[0010] Preferably, the saw teeth of the cleaning saw teeth on the upper comb plate face the comb plate mounting seat, and the saw teeth of the cleaning saw teeth on the lower comb plate face away from the comb plate mounting seat.

[0011] Preferably, the transverse bracket assembly comprises a first transverse bracket and a second transverse bracket arranged at intervals, and an end connecting plate fixedly connected to the first transverse bracket and the second transverse bracket;

[0012] A clamping plate is fixedly connected to the first transverse bracket and the second transverse bracket, and a spindle mounting hole is provided on the clamping plate, and the spindle is arranged through the spindle mounting hole;

[0013] The lower side of the card plate is connected to a roller, the outer side of the roller is also provided with an anti-slip guard plate fixedly connected to the card plate, and the anti-slip hanging plate is connected to a track guard plate;

[0014] The connecting frame is fixedly connected between two corresponding clamping plates on two transverse bracket assemblies.

[0015] Preferably, a limit plate is provided on the transverse support assembly, and the lower comb plate is arranged through the limit plate;

[0016] Support guide plates are also provided at both ends of the main shaft, and the support guide plates are supported on the transverse bracket assembly;

[0017] The supporting guide plate is located outside the clamping plate.

[0018] Preferably, the horizontal driving device comprises a horizontal driving cylinder, a cylinder push-pull rod, and a driving connecting shaft;

[0019] The driving connecting shaft passes through the front wall plate and is fixedly connected to the transverse bracket assembly;

[0020] The cylinder push-pull rod and the driving connecting shaft are connected via a coupling structure.

[0021] Preferably, a maintenance manhole is provided on the front wall panel, and a manhole cover is provided at the maintenance manhole.

[0022] The beneficial effects of the present invention are as follows:

[0023] The air preheater with a dust cleaning device of the present invention is arranged by the comb plate assembly, so that the upper comb plate and the lower comb plate are subjected to less force, have less deformation, are thoroughly cleaned, and have a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A perspective view schematically showing an air preheater with a dust cleaning device according to an embodiment of the present invention;

[0025] Figure 2 A schematic diagram showing the structure of an air preheater with a dust cleaning device according to the present invention without the upper and lower tube boxes, the front and rear wall panels;

[0026] Figure 3 Schematic representation Figure 2 Enlarged view of part A in the middle;

[0027] Figure 4 Schematic representation Figure 2 Enlarged view of middle part B;

[0028] Figure 5 A schematic diagram showing a side view of an air preheater with a dust cleaning device according to the present invention without upper and lower tube boxes, front and rear wall panels;

[0029] Figure 6 Schematic representation Figure 5 The enlarged view of the C part in FIG.

[0030] Figure 7 Schematic representation Figure 5 Enlarged view of part D in .

[0031] The meanings of the symbols in the accompanying drawings are as follows:

[0032] a. Upper heat exchange tube box; b. Lower heat exchange tube box; b1. First support rod; b2. Second support rod; 1. Front wall panel; 2. Rear wall panel; 3. Transverse bracket assembly; 4. Connecting frame; 5. Main shaft; 6. Comb plate assembly; 9. Horizontal drive device; 31. First transverse bracket; 32. Second transverse bracket; 33. End connecting plate; 34. Clamping plate; 35. Roller; 36. Anti-slip guard plate; 37. Track guard plate; 61. Comb plate mounting seat; 62. Upper comb plate; 63. Lower comb plate; 38. Limiting plate; 39. Support guide plate; 91. Horizontal drive cylinder; 92. Cylinder push-pull rod; 93. Drive connecting shaft; 11. Manhole cover. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0035] Combination Figure 1-Figure 7 As shown, the present invention provides an air preheater with a dust cleaning device, comprising an upper heat exchange tube box a and a lower heat exchange tube box b, the front and rear ends of the upper heat exchange tube box a and the lower heat exchange tube box b are fixedly connected by a front wall panel 1 and a rear wall panel 2 respectively, and the upper heat exchange tube box a and the lower heat exchange tube box b are provided with a plurality of heat exchange tubes.

[0036] There is an installation height gap between the upper heat exchange tube box a and the lower heat exchange tube box b, and a dust cleaning device is provided between the upper heat exchange tube box a and the lower heat exchange tube box b. Specifically, a first support rod b1 and a second support rod b2 are provided in the lower heat exchange tube box b. According to an embodiment of the present invention, the two heat exchange tubes in the uppermost layer of the heat exchange tubes in the lower heat exchange tube box b can be removed and replaced with the first support rod b1 and the second support rod b2. Two transverse support assemblies 3 are provided on the upper side of the first support rod b1 and the second support rod b2 in parallel with each other, and a connecting frame 4 is connected between the two transverse support assemblies 3. A main shaft 5 is provided above the transverse support assembly 3, and a plurality of comb plate assemblies 6 are provided on the main shaft 5 at intervals. A horizontal driving device 9 is also included, which is located on the outer side of the front wall panel 1 and connected to the middle part of the transverse support assembly 3, and is used to drive the transverse support assembly 3 to move along the first support rod b1 and the second support rod b2.

[0037] The air preheater with a dust cleaning device of the present invention can drive the transverse support assembly 3 to move along the first support rod b1 and the second support rod b2 through the operation of the horizontal drive device 9. Since the connecting frame 4 connects the two groups of transverse support assemblies 3 together, the two groups of transverse support assemblies 3 can be moved synchronously along the first support rod b1 and the second support rod b2, thereby realizing the translation of the comb plate assembly 6 between the heat exchanger tubes and achieving the dust cleaning operation.

[0038] According to one embodiment of the present invention, the transverse bracket assembly 3 includes a first transverse bracket 31 and a second transverse bracket 32 ​​that are spaced apart, and an end connecting plate 33 that is fixedly connected to the first transverse bracket 31 and the second transverse bracket 32. The end connecting plate 33 is located at both ends of the first transverse bracket 31 and the second transverse bracket 32, and forms a frame structure with the first transverse bracket 31 and the second transverse bracket 32.

[0039] In this embodiment, a clamping plate 34 is fixedly connected to the first transverse bracket 31 and the second transverse bracket 32, and a spindle mounting hole is provided on the clamping plate 34, and the spindle 5 is arranged through the spindle mounting hole to realize the fixed connection between the spindle and the clamping plate 34. The lower side of the clamping plate 34 is connected to a roller 35, and an anti-slip guard plate 36 is also provided on the outer side of the roller 35 and fixedly connected to the clamping plate 34, and a track guard plate 37 is connected to the anti-slip hanging plate 36; the connecting frame 4 is fixedly connected between the two corresponding clamping plates 34 on the two transverse bracket assemblies 2. An oblique bracket is also provided between the connecting frame 4 and the transverse bracket assembly 3 to increase the structural strength.

[0040] Combination Figure 4 As shown, the comb plate assembly 6 of the present invention includes a comb plate mounting seat 61, an upper comb plate 62 and a lower comb plate 63. The comb plate mounting seat 61 is fixedly connected to the main shaft 5, and the upper comb plate 62 is fixedly connected to the comb plate mounting seat 61 and extends toward the upper heat exchange tube box a. The lower comb plate 63 is fixedly connected to the comb plate mounting seat 61 and extends toward the lower heat exchange tube box b. The upper comb plate 62 and the lower comb plate 63 have a self-cleaning function, and cleaning serrations are provided on the upper comb plate 62 and the lower comb plate 63. The serrations of the cleaning serrations on the upper comb plate 62 face the comb plate mounting seat 61, and the serrations of the cleaning serrations on the lower comb plate 63 face away from the comb plate mounting seat 61.

[0041] In this embodiment, a limit plate 38 is provided on the transverse support assembly 3, and the lower comb plate 63 is arranged through the limit plate 38. Support guide plates 39 are also provided at both ends of the main shaft 5, and the support guide plates 39 are supported on the transverse support assembly 3, and the support guide plates 39 are located outside the clamping plate 34.

[0042] In the air preheater cleaning operation, the longer the tooth plate, the greater the resistance, causing the comb plate to deform, and the dust accumulated at both ends cannot be cleaned. During the cleaning process, when the comb plate comes into contact with the dust, the dust accumulated on the pipe surface will produce resistance to the comb plate. Since the lower end of the comb plate is suspended, the comb plate will be subjected to bending force, causing it to bend and deform. The longer the comb plate, the more serious the deformation, resulting in the dust accumulated at both ends cannot be cleaned. The longer the comb plate, the greater the impact force, causing the comb plate to twist and deform, increasing the running resistance and damaging the heat exchange tube. During the cleaning process, the comb plate will impact or collide with the dust accumulated on the surface of the pipe. These impact forces cause the comb plate to vibrate and strain, resulting in local twisting and deformation. Deformation increases the running resistance and damages the heat exchange tube. The longer the comb plate, the greater the bending moment at the root, and the alternating load causes fatigue fracture at the root of the fixed end of the comb plate.

[0043] The air preheater with a dust cleaning device of the present invention is provided with the comb plate assembly, so that the upper comb plate 62 and the lower comb plate 63 are subjected to less force, have less deformation, are thoroughly cleaned, and have a long service life.

[0044] like Figure 2 As shown, according to one embodiment of the invention, the horizontal drive device 9 of the present invention includes a horizontal drive cylinder 91, a cylinder push-pull rod 92, and a drive connecting shaft 93. The drive connecting shaft 93 passes through the front wall plate 1 and is fixedly connected to the horizontal support assembly 3. The cylinder push-pull rod 92 and the drive connecting shaft 93 are connected by a coupling structure.

[0045] The air preheater with a dust cleaning device of the present invention can maintain a constant thrust after encountering an obstacle during cleaning, and will not cause damage to the equipment being pushed at the rear end.

[0046] like Figure 1 As shown, the front wall plate 1 of the present invention is provided with a maintenance manhole, and the maintenance manhole is provided with a manhole cover plate 11; the location where the maintenance manhole is opened corresponds to the location where the vertical reset device 8 is provided. Such a setting facilitates the maintenance of the whole machine.

[0047] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air preheater with a dust cleaning device, comprising an upper heat exchange tube box (a), a lower heat exchange tube box (b), a front wall plate (1) and a rear wall plate (2) located between the upper heat exchange tube box (a) and the lower heat exchange tube box (b) and fixedly connected to the upper heat exchange tube box (a) and the lower heat exchange tube box (b), respectively; a first support rod (b1) and a second support rod (b2) are provided in the lower heat exchange tube box (b); two transverse support groups are provided on the upper sides of the first support rod (b1) and the second support rod (b2) in parallel with each other The invention relates to a device for supporting a plurality of horizontal support assemblies (3), wherein a connecting frame (4) is connected between two horizontal support assemblies (3), a main shaft (5) is provided above the horizontal support assemblies (3), and a plurality of comb plate assemblies (6) are provided on the main shaft (5) at intervals, and further comprising a horizontal driving device (9), wherein the horizontal driving device (9) is located on the outside of the front wall plate (1) and connected to the middle of the horizontal support assemblies (3), and is used for driving the horizontal support assemblies (3) to move along the first support rod (b1) and the second support rod (b2), and is characterized in that: The comb plate assembly (6) comprises: A comb plate mounting seat (61) fixedly connected to the main shaft (5); An upper comb plate (62) is fixedly connected to the comb plate mounting seat (61) and extends toward the upper heat exchange tube box (a); A lower comb plate (63) is fixedly connected to the comb plate mounting seat (61) and extends toward the lower heat exchange tube box (b); The upper comb tooth plate (62) and the lower comb tooth plate (63) have a self-cleaning function, and cleaning saw teeth are provided on the upper comb tooth plate (62) and the lower comb tooth plate (63).

2. The air preheater with a cleaning device according to claim 1, characterized in that: The cleaning teeth on the upper comb plate (62) face the comb plate mounting seat (61), and the cleaning teeth on the lower comb plate (63) face away from the comb plate mounting seat (61).

3. The air preheater with a dust cleaning device according to claim 2, characterized in that: The transverse bracket assembly (3) comprises a first transverse bracket (31) and a second transverse bracket (32) which are arranged at intervals, and an end connecting plate (33) which is fixedly connected to the first transverse bracket (31) and the second transverse bracket (32); A clamping plate (34) is fixedly connected to the first transverse bracket (31) and the second transverse bracket (32); a main shaft mounting hole is provided on the clamping plate (34); and the main shaft (5) is arranged through the main shaft mounting hole; The lower side of the card plate (34) is connected to a roller (35), and an anti-slip guard plate (36) is provided on the outer side of the roller (35) and is fixedly connected to the card plate (34), and a track guard plate (37) is connected to the anti-slip hanging plate (36); The connecting frame (4) is fixedly connected between two corresponding clamping plates (34) on the two transverse support assemblies (2).

4. The air preheater with a dust cleaning device according to claim 3, characterized in that: The transverse support assembly (3) is provided with a limiting plate (38), and the lower comb plate (63) is arranged through the limiting plate (38); Support guide plates (39) are also provided at both ends of the main shaft (5), and the support guide plates (39) are supported on the transverse support assembly (3); The supporting guide plate (39) is located outside the clamping plate (34).

5. The air preheater with a dust cleaning device according to claim 1, characterized in that: The horizontal driving device (9) comprises a horizontal driving cylinder (91), a cylinder push-pull rod (92), and a driving connecting shaft (93); The driving connection shaft (93) passes through the front wall plate (1) and is fixedly connected to the transverse support assembly (3); The cylinder push-pull rod (92) and the driving connection shaft (93) are connected via a coupling structure.

6. The air preheater with a dust cleaning device according to claim 1, characterized in that: The front wall panel (1) is provided with a maintenance manhole, and the maintenance manhole is provided with a manhole cover plate (11).

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