A boiler flue gas waste heat recovery and utilization system

Abstract

The present application discloses a boiler flue gas waste heat recovery and utilization system, which relates to the field of flue gas treatment technology, and includes a smoke pipe, a guide assembly, a filter assembly and a drive assembly, wherein the guide assembly includes a first guide plate, a second guide plate, a third guide plate, a first guide shaft and a second guide shaft, and the cross-sections of the first guide plate, the second guide plate and the third guide plate are all arranged in a "V" shape; the filter assembly includes a first filter part and a second filter part, the first filter part and the second filter part are respectively arranged on both sides of the first guide shaft, and the first filter part and the second filter part are both provided with multiple flexible filter screens; the drive assembly is used to drive the first guide plate and the third guide plate to swing. The boiler flue gas waste heat recovery and utilization system described in the present application can filter and remove impurities in the flue gas, avoid the phenomenon of large-scale attachment of impurities, and improve the flue gas waste heat recovery effect.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas treatment, and in particular to a boiler flue gas waste heat recovery and utilization system. Background Art

[0002] At present, the fuel in the power plant boiler will release heat energy after combustion and exchange heat with water. Then the flue gas generated by the combustion will be discharged from the boiler and enter the flue. After the flue gas is discharged from the boiler, it still carries a part of the waste heat. In the existing technology, heat recovery devices such as heat exchangers are usually used to recycle the waste heat of the flue gas.

[0003] However, when the flue gas flows in the flue, it will carry impurities. After the impurities and the flue gas flow to the heat recovery device together, some of the impurities will adhere to the tube wall of the heat exchange tube in the heat recovery device, which will reduce the heat exchange performance of the heat exchange tube and affect the recovery effect of the flue gas waste heat. Summary of the invention

[0004] To this end, the technical problem to be solved by this application is to improve the problem that when the heat recovery device in the prior art recovers the waste heat of the flue gas, the impurities carried in the flue gas will adhere to the tube wall of the heat exchange tube, thereby reducing the heat exchange performance of the heat exchange tube and affecting the flue gas waste heat recovery effect.

[0005] In order to solve the above technical problems, the present application provides a boiler flue gas waste heat recovery and utilization system, comprising:

[0006] A smoke vent pipe, wherein two ends of the smoke vent pipe are respectively provided with a smoke inlet and a smoke outlet;

[0007] A guide assembly, the guide assembly comprising a first guide plate, a second guide plate, a third guide plate, a first guide shaft and a second guide shaft, the cross-sections of the first guide plate, the second guide plate and the third guide plate are all arranged in a "V" shape, and the first guide plate, the second guide plate and the third guide plate are arranged at intervals in the vertical direction, the first guide plate is hingedly arranged inside the smoke pipe through the first guide shaft, the second guide plate is fixedly connected to the inner wall of the smoke pipe, and the third guide plate is hingedly arranged inside the smoke pipe through the second guide shaft;

[0008] A filter assembly, the filter assembly comprising a first filter portion and a second filter portion, the first filter portion and the second filter portion are respectively arranged on both sides of the first guide shaft, the first filter portion and the second filter portion are both provided with a plurality of flexible filter screens, the plurality of flexible filter screens are correspondingly arranged between the inner wall of the smoke duct and the first guide plate, between the first guide plate and the second guide plate, between the second guide plate and the third guide plate, and between the third guide plate and the inner wall of the smoke duct;

[0009] A driving assembly, the driving assembly comprising an impeller, a first driving gear, a second driving gear, a first return spring and a second return spring, the impeller being arranged inside the smoke-passing pipe, the first driving gear being drivingly connected to the impeller, the first driving gear being an incomplete gear, the first driving gear being used to mesh with the second driving gear, the second driving gear being drivingly arranged with the first guide shaft and the second guide shaft; the two ends of the first return spring being respectively connected to the first guide plate and the second guide plate, the two ends of the second return spring being respectively connected to the third guide plate and the smoke-passing pipe;

[0010] Among them, after the smoke enters the smoke duct, it drives the impeller to rotate. After the first driving gear is meshed with the second driving gear, the impeller drives the first guide plate and the third guide plate to swing; after the first driving gear is disengaged from the second driving gear, the first return spring drives the first guide plate to reset, and the second return spring drives the third guide plate to reset; when the first guide plate and the third guide plate move, they pull the flexible filter to shake.

[0011] Preferably, the filter assembly further comprises a support rod, both ends of which are in contact with the inner wall of the smoke duct, and the shaft of the support rod is fixedly connected to the flexible filter screen.

[0012] Preferably, the drive assembly includes a first bevel gear set, and the impeller is connected to the first drive gear through the first bevel gear set; the second drive gear is connected to the first guide shaft and the second guide shaft through a belt drive or a chain drive.

[0013] Preferably, it also includes a collecting component, which includes four collecting boxes, wherein two of the collecting boxes are arranged on the side of the first filter portion facing the smoke inlet, and the two collecting boxes are respectively connected to the second guide plate and the inner wall of the smoke duct; the remaining two collecting boxes are arranged on the side of the second filter portion facing the smoke inlet, and the remaining two collecting boxes are respectively connected to the second guide plate and the inner wall of the smoke duct; the first guide plate and the third guide plate are both provided with collecting ports.

[0014] Preferably, the collection component further comprises:

[0015] Four collecting covers, each of which is slidably connected to the top of each collecting box;

[0016] A first collecting drive unit, the first collecting drive unit is used to drive two collecting covers located on one side of the first filter unit, the first collecting drive unit includes a first connecting rod, a third driving gear, a second bevel gear set, a first reciprocating screw, a first guide slider and a first guide slide bar, the two ends of the first connecting rod are respectively connected to the two collecting covers located on one side of the first filter unit, the third driving gear is used to mesh with the first driving gear, the third driving gear is connected to the first reciprocating screw through the second bevel gear set, the first reciprocating screw is connected to a collecting cover, the first reciprocating screw is used to drive the collecting cover to reciprocate, the first guide slide bar is connected to the collecting cover, the first guide slide bar is slidably connected to the first guide slide bar, and the first guide slide bar is connected to the inner wall of the smoke passage;

[0017] The second collecting drive unit, the second collecting drive unit is used to drive the two collecting covers located on one side of the second filter unit, the second collecting drive unit includes a second connecting rod, a driven shaft, a third bevel gear set, a second reciprocating screw, a second guide slider and a second guide slide bar, the two ends of the second connecting rod are respectively connected to the two collecting covers located on one side of the second filter unit, the driven shaft and the axle of the third driving gear are connected by belt transmission, the driven shaft and the second reciprocating screw are connected by the third bevel gear set, the second reciprocating screw is connected to a collecting cover, the second reciprocating screw is used to drive the collecting cover to reciprocate, the second guide slide bar is connected to the collecting cover, the second guide slide bar is slidably connected to the second guide slide bar, and the second guide slide bar is connected to the inner wall of the smoke duct.

[0018] Preferably, a discharge port is provided on the smoke vent pipe, the discharge port is communicated with the inner cavity of the collecting box, and a discharge cover is covered at the discharge port.

[0019] Preferably, it further comprises a protective cover, which is connected to the outer wall of the smoke duct and is arranged on the outer side of the driving assembly.

[0020] Preferably, it further comprises a heat exchanger, and the heat exchanger is communicated with the smoke outlet of the smoke duct.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] The boiler flue gas waste heat recovery and utilization system described in the present application is provided with a smoke pipe and a filter assembly. When the boiler flue gas waste heat recovery and utilization system is working, the flexible filter mesh in the filter assembly can filter and remove impurities in the flue gas, thereby reducing the amount of impurities entering the subsequent heat recovery device, avoiding the adhesion of impurities, and improving the flue gas waste heat recovery effect.

[0023] The boiler flue gas waste heat recovery and utilization system described in the present application is configured with a guide component and a drive component, so that the flexible filter screen can be automatically cleaned to avoid a large amount of impurities adhering to the flexible filter screen, thereby ensuring the filtering effect of the flexible filter screen; wherein, after the flue gas enters the smoke duct, the impeller is driven to rotate, and through the first drive gear set as an incomplete gear, when the first drive gear is meshed with the second drive gear, the impeller drives the first guide plate and the third guide plate to swing; when the first drive gear is disengaged from the second drive gear, the first return spring drives the first guide plate to return to its original position, and the second return spring drives the third guide plate to return to its original position; the first drive gear is set as an incomplete gear, and the second drive gear is meshed with the second drive gear. When the first guide plate and the third guide plate move, they will pull the flexible filter to shake, thereby shaking off impurities attached to the flexible filter, achieving an automatic cleaning effect; by setting the first guide plate, the second guide plate and the third guide plate with a "V"-shaped cross-section, when the flexible filter of the first filter part is elongated and deformed, the flexible filter of the second filter part corresponding to the position of the flue gas flow channel shrinks and adapts inwardly, and when the flexible filter of the first filter part shrinks and adapts inwardly, the flexible filter of the second filter part corresponding to the position of the flue gas flow channel is elongated and deformed, thereby ensuring the filtering effect at the same time when cleaning multiple flexible filter screens in the first filter part and the second filter part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the present application easier to understand, the present application is further described in detail below based on the specific embodiments of the present application and in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 It is a structural schematic diagram of a boiler flue gas waste heat recovery and utilization system in a preferred embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of the structure of the smoke pipe;

[0027] Figure 3 It is a schematic diagram of the structure of the diversion component and the filtering component;

[0028] Figure 4 It is a structural diagram of the drive component and the collection component.

[0029] Description of the accompanying drawings: 1. Smoke pipe; 11. Smoke inlet; 12. Smoke outlet; 13. Discharge port; 14. Discharge cover; 2. Guide assembly; 21. First guide plate; 22. Second guide plate; 23. Third guide plate; 24. First guide shaft; 25. Second guide shaft; 26. Collecting port; 3. Filter assembly; 31. First filter section; 32. Second filter section; 33. Flexible filter screen; 34. Support rod; 4. Drive assembly; 41. Impeller; 42. First drive gear; 43. Second drive gear; 44. First return spring; 45. Second return spring Spring; 46, first bevel gear set; 5, collection assembly; 51, collection box; 52, collection cover; 53, first collection drive unit; 531, first connecting rod; 532, third drive gear; 533, second bevel gear set; 534, first reciprocating screw; 535, first guide slider; 536, first guide slide; 54, second collection drive unit; 541, second connecting rod; 542, driven shaft; 543, third bevel gear set; 544, second reciprocating screw; 545, second guide slider; 546, second guide slide; 6, protective cover; 7, heat exchanger. DETAILED DESCRIPTION

[0030] The present application is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present application and implement it, but the embodiments are not intended to limit the present application.

[0031] Reference Figures 1 to 4 As shown, the present application discloses a boiler flue gas waste heat recovery and utilization system, comprising:

[0032] A smoke vent 1, with a smoke inlet 11 and a smoke outlet 12 respectively formed at both ends of the smoke vent 1;

[0033] A guide assembly 2, the guide assembly 2 includes a first guide plate 21, a second guide plate 22, a third guide plate 23, a first guide shaft 24 and a second guide shaft 25, the cross-sections of the first guide plate 21, the second guide plate 22 and the third guide plate 23 are all arranged in a "V" shape, and the first guide plate 21, the second guide plate 22 and the third guide plate 23 are arranged at intervals in the vertical direction, the first guide plate 21 is hingedly arranged inside the smoke pipe 1 through the first guide shaft 24, the second guide plate 22 is fixedly connected to the inner wall of the smoke pipe 1, and the third guide plate 23 is hingedly arranged inside the smoke pipe 1 through the second guide shaft 25;

[0034] The filter assembly 3 includes a first filter portion 31 and a second filter portion 32, which are respectively arranged on both sides of the first guide shaft 24, and the first filter portion 31 and the second filter portion 32 are both provided with a plurality of flexible filter screens 33, which are correspondingly arranged between the inner wall of the smoke-passing pipe 1 and the first guide plate 21, between the first guide plate 21 and the second guide plate 22, between the second guide plate 22 and the third guide plate 23, and between the third guide plate 23 and the inner wall of the smoke-passing pipe 1;

[0035] The driving assembly 4 includes an impeller 41, a first driving gear 42, a second driving gear 43, a first return spring 44 and a second return spring 45. The impeller 41 is arranged inside the smoke pipe 1. The first driving gear 42 is connected to the impeller 41 in a transmission manner. The first driving gear 42 is an incomplete gear. The first driving gear 42 is used to mesh with the second driving gear 43. The second driving gear 43 is connected to the first guide shaft 24 and the second guide shaft 25 in a transmission manner. The two ends of the first return spring 44 are respectively connected to the first guide plate 21 and the second guide plate 22. The two ends of the second return spring 45 are respectively connected to the third guide plate 23 and the smoke pipe 1.

[0036] Among them, after the smoke enters the smoke duct 1, it drives the impeller 41 to rotate. After the first driving gear 42 is engaged with the second driving gear 43, the impeller 41 drives the first guide plate 21 and the third guide plate 23 to swing; after the first driving gear 42 is disengaged from the second driving gear 43, the first return spring 44 drives the first guide plate 21 to reset, and the second return spring 45 drives the third guide plate 23 to reset; when the first guide plate 21 and the third guide plate 23 move, they pull the flexible filter screen 33 to shake.

[0037] The boiler flue gas waste heat recovery and utilization system is provided with a smoke pipe 1 and a filter assembly 3. The flexible filter 33 in the filter assembly 3 can filter and remove impurities in the flue gas, thereby reducing the amount of impurities entering the subsequent heat recovery device, avoiding the phenomenon of large amounts of impurities adhering, and improving the flue gas waste heat recovery effect.

[0038] The boiler flue gas waste heat recovery and utilization system is provided with a guide component 2 and a drive component 4, so that the flexible filter screen 33 can be automatically cleaned, thereby preventing a large amount of impurities from adhering to the flexible filter screen 33, and ensuring the filtering effect of the flexible filter screen 33; wherein, after the flue gas enters the smoke pipe 1, the impeller 41 is driven to rotate, and through the first driving gear 42 set as an incomplete gear, when the first driving gear 42 is meshed with the second driving gear 43, the impeller 41 drives the first guide plate 21 and the third guide plate 23 to swing; when the first driving gear 42 is disengaged from the second driving gear 43, the first return spring 44 drives the first guide plate 21 to return, and the second return spring 45 drives the third guide plate 23 to return; the first guide When the flow plate 21 and the third guide plate 23 move, they will pull the flexible filter screen 33 to shake, thereby shaking off impurities attached to the flexible filter screen 33, and achieving an automatic cleaning effect; by setting the first guide plate 21, the second guide plate 22 and the third guide plate 23 with a "V"-shaped cross-section, when the flexible filter screen 33 of the first filter part 31 is elongated and deformed, the flexible filter screen 33 of the second filter part 32 corresponding to the position of the flue gas flow channel shrinks and adapts inwardly; when the flexible filter screen 33 of the first filter part 31 shrinks and adapts inwardly, the flexible filter screen 33 of the second filter part 32 corresponding to the position of the flue gas flow channel is elongated and deformed, so that when cleaning multiple flexible filter screens 33 in the first filter part 31 and the second filter part 32, the filtering effect is guaranteed at the same time.

[0039] In the present embodiment, specifically, the impeller 41 drives the first driving gear 42 to rotate. When the first driving gear 42 and the second driving gear 43 are meshed, the second driving gear 43 rotates and drives the first guide shaft 24 to rotate. The first guide shaft 24 drives the first guide plate 21 to move. The first guide plate 21 swings toward the side of the smoke inlet 11 in a direction away from the second guide plate 22. The first guide plate 21 swings toward the side of the smoke outlet 12 in a direction close to the second guide plate 22. The first return spring 44 is deformed. At this time, at the position of the first filter portion 31, the soft space between the inner wall of the smoke passage 1 and the first guide plate 21 The flexible filter screen 33 is retracted and adapted, and at the position of the second filter part 32 located in the same flue gas flow passage, the flexible filter screen 33 between the inner wall of the smoke duct 1 and the first guide plate 21 is stretched and deformed, and the flexible filter screen 33 of the first filter part 31 plays a role in ensuring filtration; similarly, at the position of the first filter part 31, the flexible filter screen 33 between the first guide plate 21 and the second guide plate 22 is stretched and deformed, and at the position of the second filter part 32 located in the same flue gas flow passage, the flexible filter screen 33 between the first guide plate 21 and the second guide plate 22 is stretched and adapted, and the flexible filter screen 33 of the second filter part 32 plays a role in ensuring filtration. When the first driving gear 42 is disengaged from the second driving gear 43, the first reset spring 44 drives the first guide plate 21 to reset. When the first guide plate 21 is quickly reset, the flexible filter 33 between the inner wall of the smoke pipe 1 and the first guide plate 21 and the flexible filter 33 between the first guide plate 21 and the second guide plate 22 shake, thereby shaking off impurities attached to the flexible filter 33, and realizing automatic cleaning of the flexible filter 33 on both sides of the first guide plate 21. At the same time, the third guide plate 23 performs the same movement as the first guide plate 21, thereby realizing automatic cleaning of the flexible filter 33 on both sides of the third guide plate 23.

[0040] In this embodiment, preferably, the filter assembly 3 further includes a support rod 34 , both ends of the support rod 34 are in contact with the inner wall of the smoke duct 1 , and the shaft of the support rod 34 is fixedly connected to the flexible filter screen 33 .

[0041] By providing the support rod 34, the support rod 34 is used to open the flexible filter screen 33 to prevent the two sides of the flexible filter screen 33 from being separated from the inner wall of the smoke passage 1, thereby ensuring the filtering effect.

[0042] In this embodiment, preferably, the driving assembly 4 includes a first bevel gear set 46, and the impeller 41 is connected to the first driving gear 42 through the first bevel gear set 46; the second driving gear 43 is connected to the first guide shaft 24 and the second guide shaft 25 through a belt drive or a chain drive. Specifically, in this embodiment, the second driving gear 43, the first guide shaft 24, and the second guide shaft 25 are connected through a belt drive.

[0043] In the present embodiment, preferably, the boiler flue gas waste heat recovery and utilization system also includes a collecting component 5, the collecting component 5 includes four collecting boxes 51, wherein two collecting boxes 51 are arranged on the side of the first filter part 31 facing the smoke inlet 11, and the two collecting boxes 51 are respectively connected to the second guide plate 22 and the inner wall of the smoke duct 1; the remaining two collecting boxes 51 are arranged on the side of the second filter part 32 facing the smoke inlet 11, and the remaining two collecting boxes 51 are respectively connected to the second guide plate 22 and the inner wall of the smoke duct 1; the first guide plate 21 and the third guide plate 23 are both provided with collecting ports 26.

[0044] By setting up the collection box 51, when the flexible filter 33 shakes, impurities can fall into the collection box 51. The collection box 51 is respectively arranged on the inner wall of the second guide plate 22 and the smoke pipe 1, which reduces the height and difficulty of collecting the impurities, and is conducive to collecting impurities dropped on multiple flexible filters 33 at the same time.

[0045] In this embodiment, preferably, the collecting component 5 further includes:

[0046] Four collecting covers 52, each collecting cover 52 is correspondingly slidably connected to the top of each collecting box 51;

[0047] The first collecting driving part 53 is used to drive the two collecting covers 52 located on one side of the first filtering part 31. The first collecting driving part 53 includes a first connecting rod 531, a third driving gear 532, a second bevel gear set 533, a first reciprocating screw 534, a first guide slider 535 and a first guide slide bar 536. The two ends of the first connecting rod 531 are respectively connected to the two collecting covers 52 located on one side of the first filtering part 31. The third driving gear 532 is used to mesh with the first driving gear 42. The third driving gear 532 is connected to the first reciprocating screw 534 through the second bevel gear set 533. The first reciprocating screw 534 is connected to a collecting cover 52. The first reciprocating screw 534 is used to drive the collecting cover 52 to reciprocate. The first guide slider 535 is connected to the collecting cover 52. The first guide slide bar 536 is slidably connected to the first guide slider 535. The first guide slide bar 536 is connected to the inner wall of the smoke passage 1.

[0048] The second collecting driving part 54 is used to drive the two collecting covers 52 located on one side of the second filter part 32. The second collecting driving part 54 includes a second connecting rod 541, a driven shaft 542, a third bevel gear set 543, a second reciprocating screw 544, a second guide slider 545 and a second guide slide 546. The two ends of the second connecting rod 541 are respectively connected to the two collecting covers 52 located on one side of the second filter part 32. The driven shaft 542 and the axle of the third driving gear 532 are connected by belt transmission. The driven shaft 542 and the second reciprocating screw 544 are connected by the third bevel gear set 543. The second reciprocating screw 544 is connected to a collecting cover 52. The second reciprocating screw 544 is used to drive the collecting cover 52 to reciprocate. The second guide slider 545 is connected to the collecting cover 52. The second guide slide 546 is slidably connected to the second guide slider 545. The second guide slide 546 is connected to the inner wall of the smoke pipe 1.

[0049] By providing the collection cover 52, the collection effect of the collection box 51 on impurities is improved. The first collection drive unit 53 can drive the two collection covers 52 located on one side of the first filter unit 31, and the second collection drive unit 54 can drive the two collection covers 52 located on one side of the second filter unit 32, thereby realizing automatic opening and closing of the collection cover 52.

[0050] In this embodiment, specifically, the impeller 41 rotates to drive the first drive gear 42 to rotate. When the first drive gear 42 rotates, the first drive gear 42 first meshes with the second drive gear 43, thereby driving the first guide plate 21 and the second guide plate 22 to move; then the first drive gear 42 meshes with the third drive gear 532, the third drive gear 532 rotates, and through the transmission of the second bevel gear set 533, drives the first reciprocating screw 534 to rotate, and the first reciprocating screw 534 drives the collection cover 52 to move to open the collection box. 51 is opened, and the cooperation of the first guide slider 535 and the first guide slide bar 536 improves the sliding reliability of the collection cover 52; then the first drive gear 42 is disengaged from the second drive gear 43, the first guide plate 21 and the third guide plate 23 are reset, and the impurities are shaken off the flexible filter screen 33 and fall into the collection box 51. Finally, the collection cover 52 moves in the opposite direction under the control of the first reciprocating screw 534 until the collection cover 52 is closed on the top of the collection box 51, and the first drive gear 42 is disengaged from the third drive gear 532. Specifically, the movement process of the second collection drive unit 54 is similar to the movement process of the first collection drive unit 53, which will not be repeated here.

[0051] In this embodiment, preferably, two first drive gears 42 can be coaxially arranged, and the two first drive gears 42 are respectively used to mesh with the second drive gear 43 and the third drive gear 532, so as to facilitate the layout and improve the transmission stability.

[0052] In this embodiment, preferably, a discharge port 13 is provided on the smoke passage 1 , the discharge port 13 is communicated with the inner cavity of the collection box 51 , and a discharge cover 14 is covered at the discharge port 13 .

[0053] By providing the discharge port 13 and the discharge cover 14 , it is convenient to discharge the impurities collected in the collection box 51 from the discharge port 13 , thereby reducing the difficulty of operation.

[0054] In this embodiment, preferably, the boiler flue gas waste heat recovery and utilization system further includes a protective cover 6 , which is connected to the outer wall of the smoke pipe 1 , and the protective cover 6 is arranged on the outer side of the driving component 4 .

[0055] By providing the protective cover 6, the protective cover 6 plays a role in protecting the drive assembly 4, reducing the risk of damage to the drive assembly 4 and improving the reliability of system operation.

[0056] In this embodiment, preferably, the boiler flue gas waste heat recovery and utilization system further includes a heat exchanger 7 , and the heat exchanger 7 is connected to the smoke outlet 12 of the smoke duct 1 .

[0057] After the flue gas flows through the smoke pipe 1, impurities in the flue gas are blocked and filtered by the filter assembly 3. The filtered flue gas is passed from the smoke outlet 12 to the heat exchanger 7 to enter the waste heat recovery, which reduces the influence of impurities adhesion and improves the recovery effect of flue gas waste heat.

[0058] The implementation principle of the embodiment of the present application is: when the boiler flue gas waste heat recovery and utilization system is in operation, the filter component 3 filters the flue gas entering the smoke duct 1, thereby reducing the content of impurities in the flue gas; after the flue gas enters the smoke duct 1, the impeller 41 is driven to rotate, and the impeller 41 drives the first guide plate 21 and the third guide plate 23 to shake, thereby shaking off impurities attached to the flexible filter screen 33, and the collection component 5 collects the fallen impurities; the filtered flue gas flows into the heat exchanger 7, thereby realizing efficient recovery and utilization of the flue gas waste heat.

[0059] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A boiler flue gas waste heat recovery and utilization system, characterized in that: include: A smoke vent pipe, wherein two ends of the smoke vent pipe are respectively provided with a smoke inlet and a smoke outlet; A guide assembly, the guide assembly comprising a first guide plate, a second guide plate, a third guide plate, a first guide shaft and a second guide shaft, the cross-sections of the first guide plate, the second guide plate and the third guide plate are all arranged in a "V" shape, and the first guide plate, the second guide plate and the third guide plate are arranged at intervals in the vertical direction, the first guide plate is hingedly arranged inside the smoke pipe through the first guide shaft, the second guide plate is fixedly connected to the inner wall of the smoke pipe, and the third guide plate is hingedly arranged inside the smoke pipe through the second guide shaft; A filter assembly, the filter assembly comprising a first filter portion and a second filter portion, the first filter portion and the second filter portion are respectively arranged on both sides of the first guide shaft, the first filter portion and the second filter portion are both provided with a plurality of flexible filter screens, the plurality of flexible filter screens are correspondingly arranged between the inner wall of the smoke duct and the first guide plate, between the first guide plate and the second guide plate, between the second guide plate and the third guide plate, and between the third guide plate and the inner wall of the smoke duct; A driving assembly, the driving assembly includes an impeller, a first driving gear, a second driving gear, a first return spring and a second return spring, the impeller is arranged inside the smoke duct, the first driving gear is drivingly connected to the impeller, the first driving gear is an incomplete gear, the first driving gear is used to mesh with the second driving gear, and the second driving gear is drivingly arranged with the first guide shaft and the second guide shaft; the two ends of the first return spring are respectively connected to the first guide plate and the second guide plate, and the two ends of the second return spring are respectively connected to the third guide plate and the smoke duct.

2. The boiler flue gas waste heat recovery system according to claim 1 is characterized in that: The filter assembly further comprises a support rod, both ends of which are in contact with the inner wall of the smoke duct, and the rod body of the support rod is fixedly connected with the flexible filter screen.

3. The boiler flue gas waste heat recovery and utilization system according to claim 1 is characterized in that: The driving assembly includes a first bevel gear set, and the impeller is connected to the first driving gear through the first bevel gear set; the second driving gear is connected to the first guide shaft and the second guide shaft through a belt drive or a chain drive.

4. The boiler flue gas waste heat recovery system according to claim 1 is characterized in that: It also includes a collecting component, which includes four collecting boxes, two of which are arranged on the side of the first filter part facing the smoke inlet, and the two collecting boxes are respectively connected to the second guide plate and the inner wall of the smoke duct; the remaining two collecting boxes are arranged on the side of the second filter part facing the smoke inlet, and the remaining two collecting boxes are respectively connected to the second guide plate and the inner wall of the smoke duct; the first guide plate and the third guide plate are both provided with collecting ports.

5. The boiler flue gas waste heat recovery system according to claim 4 is characterized in that: The collection component also includes: Four collecting covers, each of which is slidably connected to the top of each collecting box; A first collecting drive unit, the first collecting drive unit is used to drive two collecting covers located on one side of the first filter unit, the first collecting drive unit includes a first connecting rod, a third driving gear, a second bevel gear set, a first reciprocating screw, a first guide slider and a first guide slide bar, the two ends of the first connecting rod are respectively connected to the two collecting covers located on one side of the first filter unit, the third driving gear is used to mesh with the first driving gear, the third driving gear is connected to the first reciprocating screw through the second bevel gear set, the first reciprocating screw is connected to a collecting cover, the first reciprocating screw is used to drive the collecting cover to reciprocate, the first guide slide bar is connected to the collecting cover, the first guide slide bar is slidably connected to the first guide slide bar, and the first guide slide bar is connected to the inner wall of the smoke passage; The second collecting drive unit, the second collecting drive unit is used to drive the two collecting covers located on one side of the second filter unit, the second collecting drive unit includes a second connecting rod, a driven shaft, a third bevel gear set, a second reciprocating screw, a second guide slider and a second guide slide bar, the two ends of the second connecting rod are respectively connected to the two collecting covers located on one side of the second filter unit, the driven shaft and the axle of the third driving gear are connected by belt transmission, the driven shaft and the second reciprocating screw are connected by the third bevel gear set, the second reciprocating screw is connected to a collecting cover, the second reciprocating screw is used to drive the collecting cover to reciprocate, the second guide slide bar is connected to the collecting cover, the second guide slide bar is slidably connected to the second guide slide bar, and the second guide slide bar is connected to the inner wall of the smoke duct.

6. The boiler flue gas waste heat recovery system according to claim 4 is characterized in that: The smoke passage pipe is provided with a discharge port, the discharge port is communicated with the inner cavity of the collecting box, and the discharge port is covered with a discharge cover.

7. The boiler flue gas waste heat recovery system according to claim 1 is characterized in that: It also includes a protective cover, which is connected to the outer wall of the smoke duct and is arranged on the outer side of the driving component.

8. The boiler flue gas waste heat recovery system according to claim 1 is characterized in that: It also includes a heat exchanger, which is communicated with the smoke outlet of the smoke duct.

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