Power plant waste heat recycling device and working method thereof

Abstract

The invention provides a power plant waste heat recycling device and a working method thereof. The device comprises a heat exchange system, a filtering system, an impurity collecting system and a driving system. Wherein the heat exchange system is connected with the filtering system, and a driving system is arranged in the heat exchange system and used for recycling waste heat in flue gas exhausted by the power plant; the filtering system is arranged at the flue gas input end of the heat exchange system and is used for filtering impurities in the flue gas; the impurity collecting system clings to the filtering system and is used for collecting filtered impurities; the driving system is arranged in the heat exchange system and used for driving water in the heat exchange system to be mixed, and the heat exchange efficiency is improved. Smoke is filtered through the filter plate, the filter plate and the scraper plate are arranged, impurities filtered from one side of the filter plate are removed by controlling reciprocating sliding of the scraper plate, the situation that the smoke cannot pass through due to blockage of the filter plate is avoided, meanwhile, the filtered impurities are stored through the impurity storage box, and centralized cleaning of the impurities is achieved regularly.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization, and in particular to a waste heat recycling device for a power plant and a working method thereof. Background Art

[0002] Power plants generate electricity by burning coal, which generates a lot of waste heat in the process. In order to avoid heat loss, the waste heat needs to be reused. When coal is burned, impurities such as dust are generated. When the heat in the hot air flow is recovered, the impurities will condense in the pipe. As a result, the accumulation over time will cause the pipe wall to thicken, reducing the efficiency of heat recovery.

[0003] Utility model CN217430982U discloses a waste heat recovery device for waste incineration power plants, comprising a water collection frame with a smoke exhaust pipe disposed therein; the smoke exhaust pipes extend through the left and right outer walls of the water collection frame. While this application filters the hot air flow within the smoke exhaust pipe, impurities accumulate on the filter plate over time, causing it to clog and preventing the hot air flow from passing through. Therefore, addressing this issue, designing a waste heat recovery device for power plants has become a pressing issue. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a waste heat recycling device for a power plant, which filters the flue gas through the filter plate by arranging a filter plate and a scraper, and removes impurities filtered on one side of the filter plate by the reciprocating sliding of the scraper, thereby avoiding the clogging of the filter plate and the inability of the flue gas to pass through, thereby solving the problems raised in the above-mentioned background technology.

[0005] The technical means adopted in the present invention are as follows:

[0006] A waste heat recycling device for a power plant, comprising: a heat exchange system, a filtering system, an impurity collection system and a driving system; wherein:

[0007] The heat exchange system is connected to the filtration system and is internally provided with a drive system for recovering waste heat from the flue gas discharged from the power plant;

[0008] The filtering system is provided at one end of the flue gas input of the heat exchange system and is used to filter out impurities in the flue gas;

[0009] The impurity collection system is closely attached to the filtering system and is used to collect the filtered impurities;

[0010] The driving system is arranged inside the heat exchange system and is used to drive the water in the heat exchange system to mix and improve the heat exchange efficiency.

[0011] Furthermore, the heat exchange system includes: a heat exchange box, a branch pipe and a recycling box; wherein:

[0012] The heat exchange box is wrapped around the branch pipe and filled with water to absorb the temperature of the flue gas in the branch pipe and recover the waste heat;

[0013] The branch pipe is arranged inside the heat exchange box and is used to transmit the flue gas generated by combustion power generation;

[0014] The recycling box is connected to the heat exchange box and is filled with water. When the water temperature in the heat exchange box rises and the heat exchange efficiency decreases, the recycling box is used to absorb the heat in the flue gas.

[0015] Furthermore, the filtering system includes: a smoke conveying pipe, a fixing frame, a shaft, a transmission paddle, a filter plate, and the smoke conveying pipe is connected to the heat exchange box and is used to input the smoke into the branch pipe;

[0016] The fixing frame has a bottom fixed to the inner wall of the smoke conveying pipe and a hollow top for fixing the shaft;

[0017] The shaft is fixed to the axis of the smoke conveying pipe through a fixing frame, and one end is connected to fix the transmission paddle;

[0018] The transmission paddle is mounted on the shaft and drives the transmission paddle to rotate when smoke is input into the smoke delivery pipe;

[0019] The filter plate is arranged between the smoke conveying pipe and the heat exchanger and is used to filter out impurities in the smoke.

[0020] Furthermore, the filtering system further comprises: a guide member, a scraper, a baffle, a guide rail groove and a slide rod; wherein:

[0021] One end of the guide is connected to the tail of the shaft, and the other end is fixedly connected to the slide bar.

[0022] The scraper is closely attached to the filter plate on one side and fixed with a baffle on the other side for scraping off the flue gas impurities filtered out from the filter plate surface;

[0023] The baffle is mounted on the scraper on one side and has a guide rail groove fixed on the other side. The baffle is wider than the scraper and is used to block the smoke from blowing away impurities.

[0024] The guide rail groove is a long strip guide rail; one end of the slide rod is fixedly connected to the guide member, and the other end is slidably installed in the guide rail groove for controlling the movement of the scraper and the baffle.

[0025] Furthermore, the impurity collection system includes: a feed door, a first spring, a support member, a second spring, a material cleaning member, a storage box and a bottom plate; wherein:

[0026] The feed door is hinged inside the smoke conveying pipe and is opened and closed by a first spring. The support member is hinged to the inner wall of the smoke conveying pipe by a second spring, and a cleaning member is fixedly installed inside. The length of the cleaning member is equal to the length of the scraper.

[0027] The storage box is connected to the bottom of the smoke conveying pipe and is used for collecting filtered impurities; the bottom plate is slidably arranged at the bottom of the storage box and is used for regularly emptying the impurities in the storage box.

[0028] Furthermore, the drive system includes: a reciprocating screw, a transmission member, a limit rod, a flow-pushing plate, a motor, a pulley and a belt; wherein:

[0029] The reciprocating screw is connected to the pulley at one end and fixed to the inner wall of the heat exchange box at the other end; the transmission member is provided with two holes, the first hole is sleeved on the reciprocating screw, and the second hole is sleeved on the limit rod, and the two ends of the limit rod are respectively fixed to the inner wall of the heat exchange box, and the reciprocating screw is parallel to the limit rod; the push plate is fixed below the second hole to mix the water temperature in the heat exchange box evenly;

[0030] The motor is installed on one side of the heat exchange box connected to the recycling box to drive the pulley to rotate; the belt is arranged on the outside of the pulley to drive the reciprocating screw rod and the transmission part to move.

[0031] The present invention also provides a method for operating a waste heat recycling device for a power plant, the specific steps of which include:

[0032] S1. After the flue gas generated by combustion and power generation in the power plant enters the flue pipe, it drives the transmission paddle to rotate, which in turn drives the shaft, guide and slide bar to move. The slide bar slides in the guide groove, which in turn drives the scraper and baffle to reciprocate. The scraper is close to the filter plate to collect the filtered impurities;

[0033] S2. The filtered flue gas enters the branch pipe and absorbs the heat in the flue gas through the water in the heat exchange box. The motor drives the push plate to make reciprocating motion to mix the water temperature in the heat exchange box evenly.

[0034] S3. When the water temperature in the heat exchange box rises, the heat exchange efficiency decreases, and the residual heat of the flue gas in the branch pipe is absorbed by the recovery box;

[0035] S4. When the feed door is not in contact with the scraper, it is in a closed state under the action of the first spring to prevent impurities in the storage box from floating out. When the scraper pushes the feed door, the feed door flips over, the first spring contracts, and after the scraper enters the feed door, the baffle overlaps with the cleaning piece. The cleaning piece scrapes the impurities on the surface of the scraper and baffle and collects them into the storage box. The impurities in the storage box are cleaned regularly by opening the bottom plate.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] The present invention provides a power plant waste heat recycling device and a working method thereof, which filters flue gas through a filter plate, and provides a filter plate and a scraper. The scraper removes impurities filtered on one side of the filter plate by reciprocating sliding, thereby avoiding the phenomenon that the filter plate is blocked and the flue gas cannot pass through. At the same time, the impurities are stored in a storage box to achieve centralized cleaning of the impurities.

[0038] The present invention provides a power plant waste heat recycling device and a working method thereof. By setting a transmission part and a push plate, a starting motor is used to drive a pulley and a reciprocating screw to rotate, so that the transmission part can slide back and forth inside the heat exchange box, thereby pushing the water in the heat exchange box through the sliding rod, causing the water in the heat exchange box to roll, and then making the water temperature at various positions in the heat exchange box at an average temperature, thereby avoiding the phenomenon of local temperature rise of the water in the heat exchange box causing a decrease in heat exchange efficiency.

[0039] Based on the above reasons, the present invention can be widely promoted in the field of waste heat utilization technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 It is a structural diagram of the power plant waste heat recycling device in the present invention.

[0042] Figure 2 for Figure 1 Enlarged view of the structure of part A in the middle.

[0043] Figure 3 for Figure 1 Enlarged view of the structure of part B in the middle.

[0044] Figure 4 for Figure 1 Enlarged view of the structure of part C in the middle.

[0045] Figure 5 It is a side view of the power plant waste heat recycling device in the present invention.

[0046] In the figure: 1. heat exchange box; 2. branch pipe; 3. smoke conveying pipe; 4. fixing frame; 5. shaft; 6. transmission paddle; 7. guide member; 8. filter plate; 9. scraper; 10. baffle; 11. guide rail groove; 12. slide bar; 13. feed door; 14. reciprocating screw; 15. transmission member; 15-1. first hole position; 15-2. second hole position; 16. limit rod; 17. push plate; 18. motor; 19. pulley; 20. belt; 21. recycling box; 22. first spring; 23. support member; 24. second spring; 25. material cleaning member; 26. storage box; 27. bottom plate. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0051] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0054] like Figure 1As shown, the present invention provides a waste heat recycling device for a power plant, comprising: a heat exchange system, a filtering system, an impurity collection system and a driving system; wherein:

[0055] The heat exchange system is connected to the filtration system and is internally provided with a drive system for recovering waste heat from the flue gas discharged from the power plant;

[0056] The filtering system is provided at one end of the flue gas input of the heat exchange system and is used to filter out impurities in the flue gas;

[0057] The impurity collection system is closely attached to the filtering system and is used to collect the filtered impurities;

[0058] The driving system is arranged inside the heat exchange system and is used to drive the water in the heat exchange system to mix and improve the heat exchange efficiency.

[0059] In specific implementation, as a preferred embodiment of the present invention, the heat exchange system includes: a heat exchange box 1, a branch pipe 2 and a recycling box 21; wherein:

[0060] The heat exchange box 1 is wrapped around the branch pipe 2 and filled with water to absorb the temperature of the flue gas in the branch pipe 2 and recover the waste heat;

[0061] The branch pipe 2 is provided inside the heat exchange box 1 and is used to transmit the flue gas generated by combustion power generation;

[0062] The recycling box 21 is connected to the heat exchange box 1 and is filled with water. When the water temperature in the heat exchange box 1 increases and the heat exchange efficiency decreases, the recycling box 21 is used to absorb the heat in the flue gas.

[0063] In specific implementation, as a preferred embodiment of the present invention, the filtering system includes: a smoke conveying pipe 3, a fixing frame 4, a shaft 5, a transmission paddle 6, a filter plate 8,

[0064] The smoke delivery pipe 3 is connected to the heat exchange box 1 and is used to input the smoke into the branch pipe 2;

[0065] The fixing frame 4 has its bottom fixed to the inner wall of the smoke pipe 3 and its top is hollow for fixing the shaft 5;

[0066] The shaft 5 is fixed to the axis of the smoke pipe 3 through the fixing frame 4, and one end is connected to fix the transmission paddle 6;

[0067] The transmission paddle 6 is mounted on the shaft 5. When smoke enters the smoke delivery pipe 3, the transmission paddle 6 is driven to rotate.

[0068] The filter plate 8 is arranged between the smoke conveying pipe 3 and the heat exchanger 1 to filter out impurities in the smoke.

[0069] In specific implementation, as a preferred embodiment of the present invention, the filtering system further includes: a guide member 7, a scraper 9, a baffle 10, a guide rail groove 11 and a slide rod 12; wherein:

[0070] The guide member 7 has one end connected to the tail of the shaft 5 and the other end fixedly connected to the slide bar 12.

[0071] The scraper 9 is closely attached to the filter plate 8 on one side, and a baffle 10 is fixedly installed on the other side for scraping off the flue gas impurities filtered out from the surface of the filter plate 8;

[0072] The baffle 10 is mounted on the scraper 9 on one side and is fixed with a guide rail 11 on the other side. The baffle 10 is wider than the scraper 9 and is used to block the smoke from blowing away impurities.

[0073] The guide rail groove 11 is a long strip guide rail; the slide rod 12 is fixedly connected to the guide member 7 at one end and slidably installed in the guide rail groove 11 at the other end for controlling the movement of the scraper 9 and the baffle 10.

[0074] In specific implementation, as a preferred embodiment of the present invention, the impurity collection system includes: a feed door 13, a first spring 22, a support member 23, a second spring 24, a cleaning member 25, a storage box 26 and a bottom plate 27; wherein:

[0075] The feed door 13 is hinged inside the smoke delivery pipe 3 and is opened and closed by a first spring 22. The support member 23 is hinged to the inner wall of the smoke delivery pipe 3 by a second spring 24, and a cleaning member 25 is fixedly installed inside. The length of the cleaning member 25 is equal to the length of the scraper 9.

[0076] The storage box 26 is connected to the bottom of the smoke conveying pipe 3 and is used to collect filtered impurities; the bottom plate 27 is slidably arranged at the bottom of the storage box 26 and is used to regularly empty the impurities in the storage box 26.

[0077] When implementing, Figure 4As shown, when the smoke flows in the smoke conveying pipe 3, it will impact the transmission paddle 6, causing the transmission paddle 6 to rotate. When the transmission paddle 6 rotates, it will drive the guide member 7 to rotate through the shaft 5, and then drive the slide bar 12 to slide on the inner side of the guide groove 11, thereby causing the guide groove 11 to slide back and forth, and then the impurities filtered on one side of the filter plate 8 are scraped off from the surface of the filter plate 8 by the scraper 9. At the same time, the transverse length of the baffle 10 is gradually increased from top to bottom, and the baffle 10 is L-shaped to wrap the scraper 9 inside, so that when the impurities above the filter plate 8 are scraped off and fall, they will fall on the bottom of the baffle 10 perpendicular to the top of the transverse plate of the filter plate 8, and at the same time, the baffle 10 forms a blockage for the airflow, thereby preventing the impurities from leaving the surface of the filter plate 8 and being blown away by the airflow, thereby facilitating the concentration of impurities. When the scraper 9 moves to one side of the feed door 1, the scraper 9 will push the feed door 13 The scraper 9 is pushed to turn over, and the first spring 22 is contracted, so that the scraper 9 enters one side of the feed door 13. At the same time, when the baffle 10 coincides with the cleaning member 25, the cleaning member 25 will contact the side of the baffle 10 where the scraper 9 is installed, thereby scraping the impurities on one side of the baffle 10 from the surface of the baffle 10 and falling into the interior of the storage box 26. At the same time, when the scraper 9 contacts the cleaning member 25, the scraper 9 will push the cleaning member 25 to prompt the support member 23 to turn over, so that the cleaning member 25 scrapes one side of the scraper 9, so that the impurities scraped by the scraper 9 enter the storage box 26, avoiding impurities remaining on the surface of the scraper 9. By making the scraper 9 repeat the above movement, the impurities filtered by the filter plate 8 are promptly removed, avoiding the accumulation of impurities. At the same time, the bottom plate 27 can be separated from the storage box 26 by pulling out the bottom plate 27, so that the impurities can be removed in a centralized manner.

[0078] In specific implementation, as a preferred embodiment of the present invention, the drive system includes: a reciprocating screw 14, a transmission member 15, a limit rod 16, a flow-pushing plate 17, a motor 18, a pulley 19 and a belt 20; wherein:

[0079] The reciprocating screw 14 has one end connected to the pulley 19 and the other end fixed to the inner wall of the heat exchange box 1; the transmission member 15 is provided with two holes, the first hole 15-1 is sleeved on the reciprocating screw 14, and the second hole 15-2 is sleeved on the limit rod 16, and the two ends of the limit rod 16 are respectively fixed to the inner wall of the heat exchange box 1, and the reciprocating screw 14 and the limit rod 16 are parallel in position; the push plate 17 is fixed below the second hole 15-2 and is used to mix the water temperature in the heat exchange box 1 evenly;

[0080] The motor 18 is installed on the side of the heat exchange box 1 connected to the recycling box 21, driving the pulley 19 to rotate; the belt 20 is arranged on the outside of the pulley 19, for driving the reciprocating screw 14 and the transmission member 15 to move.

[0081] like Figure 1 As shown, during implementation, the motor 18 is started to make the pulley 19 drive the reciprocating screw 14 to rotate, and at the same time the limit rod 16 limits the transmission member 15, so that the transmission member 15 can slide back and forth inside the heat exchange box 1. When the transmission member 15 moves, it will simultaneously drive the flow-pushing plate 17 to slide inside the heat exchange box 1, thereby pushing the water in the heat exchange box 1, causing the water in the heat exchange box 1 to roll, so that the water temperature at each position in the heat exchange box 1 is at an average temperature, avoiding the phenomenon that the heat exchange efficiency is reduced due to local heating of the water in the heat exchange box 1, and at the same time, the flow-pushing plate 17 on the other side can be driven to move by the pulley 19 and the belt 20, thereby working at the same time to speed up the efficiency of averaging the water temperature.

[0082] The present invention also includes a method for operating a waste heat recycling device for a power plant, the specific steps of which include:

[0083] S1. After the flue gas generated by combustion and power generation in the power plant enters the smoke conveying pipe 3, it drives the transmission paddle 6 to rotate. The transmission paddle 6 in turn drives the shaft 5, the guide member 7 and the slide bar 12 to move. The slide bar 12 slides in the guide groove 11, and then drives the scraper 9 and the baffle 10 to reciprocate. The scraper 9 is close to the filter plate 8 to collect the filtered impurities.

[0084] S2, the filtered flue gas enters the branch pipe 2, and the water in the heat exchange box 1 absorbs the heat in the flue gas. The motor 18 drives the flow plate to make reciprocating motion to mix the water temperature in the heat exchange box 1 evenly;

[0085] S3: When the water temperature in the heat exchange box 1 increases, the heat exchange efficiency decreases, and the residual heat of the flue gas in the branch pipe 2 is absorbed by the recovery box 21;

[0086] S4. When the feed door 13 is not in contact with the scraper 9, it is in a closed state under the action of the first spring 22 to prevent impurities in the storage box 26 from floating out. When the scraper 9 pushes the feed door 13, the feed door 13 flips over, the first spring 22 contracts, and after the scraper 9 enters the feed door 13, the baffle 10 overlaps with the cleaning piece 25. The cleaning piece 25 scrapes the impurities on the surface of the scraper 9 and the baffle 10 and collects them in the storage box 26. The impurities in the storage box 26 are cleaned regularly by opening the bottom plate 27.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste heat recycling device for a power plant, characterized in that: include: Heat exchange system, filtration system, impurity collection system and drive system; among which: The heat exchange system is connected to the filtering system and is internally provided with a driving system for recovering waste heat from flue gas discharged from the power plant; The filtering system is arranged at one end of the flue gas input of the heat exchange system and is used to filter out impurities in the flue gas; The impurity collection system is closely attached to the filtering system and is used to collect the filtered impurities; The driving system is arranged inside the heat exchange system and is used to drive the water mixing in the heat exchange system to improve the heat exchange efficiency.

2. The power plant waste heat recycling device according to claim 1, characterized in that: The heat exchange system comprises: a heat exchange box (1), a branch pipe (2) and a recovery box (21); wherein: The heat exchange box (1) is wrapped around the branch pipe (2), and the heat exchange box (1) is filled with water to absorb the temperature of the flue gas in the branch pipe (2) and recover the waste heat; The branch pipe (2) is arranged inside the heat exchange box (1) and is used to transmit the flue gas generated by combustion power generation; The recycling box (21) is connected to the heat exchange box (1). The recycling box (21) is filled with water. When the water temperature in the heat exchange box (1) increases and the heat exchange efficiency decreases, the recycling box (21) is used to absorb the heat in the flue gas.

3. The power plant waste heat recycling device according to claim 1, characterized in that: The filtering system comprises: a smoke conveying pipe (3), a fixing frame (4), a shaft (5), a transmission paddle (6), a filter plate (8), The smoke delivery pipe (3) is connected to the heat exchange box (1) and is used to deliver smoke into the branch pipe (2); The fixing frame (4) has a bottom fixed to the inner wall of the smoke conveying pipe (3) and a hollow top for fixing the shaft rod (5); The shaft (5) is fixed to the axis of the smoke conveying pipe (3) through a fixing frame (4), and one end is connected to fix a transmission paddle (6); The transmission paddle (6) is mounted on the shaft (5), and when smoke is input into the smoke delivery pipe (3), the transmission paddle (6) is driven to rotate; The filter plate (8) is arranged between the smoke conveying pipe (3) and the heat exchanger (1) and is used to filter out impurities in the smoke.

4. The power plant waste heat recycling device according to claim 1, characterized in that: The filtering system further comprises: a guide member (7), a scraper (9), a baffle (10), a guide rail groove (11) and a slide rod (12); wherein: The guide member (7) has one end connected to the tail of the shaft (5) and the other end fixedly connected to the slide bar (12). The scraper (9) has one side in close contact with the filter plate (8) and a baffle (10) fixedly mounted on the other side for scraping off impurities in the flue gas filtered out from the surface of the filter plate (8); The baffle (10) is mounted on the scraper (9) on one side and is fixed with a guide rail groove (11) on the other side. The baffle (10) is wider than the scraper (9) and is used to prevent the smoke from blowing away impurities. The guide rail groove (11) is a long strip guide rail; one end of the slide bar (12) is fixedly connected to the guide member (7) and the other end is slidably installed in the guide rail groove (11) for controlling the movement of the scraper (9) and the baffle (10).

5. The power plant waste heat recycling device according to claim 1, characterized in that: The impurity collection system comprises: a feed door (13), a first spring (22), a support member (23), a second spring (24), a material cleaning member (25), a storage box (26) and a bottom plate (27); wherein: The feed door (13) is hinged inside the smoke conveying pipe (3) and is controlled to open and close by a first spring (22). The support member (23) is hinged to the inner wall of the smoke conveying pipe (3) by a second spring (24), and a cleaning member (25) is fixedly installed inside the support member (23). The length of the cleaning member (25) is equal to the length of the scraper (9). The impurity storage box (26) is connected to the bottom of the smoke conveying pipe (3) and is used to collect filtered impurities; the bottom plate (27) is slidably arranged at the bottom of the impurity storage box (26) and is used to regularly empty the impurities in the impurity storage box (26).

6. The power plant waste heat recycling device according to claim 1, characterized in that: The driving system comprises: a reciprocating screw (14), a transmission member (15), a limit rod (16), a flow-pushing plate (17), a motor (18), a pulley (19) and a belt (20); wherein: The reciprocating screw (14) has one end connected to the pulley (19) and the other end fixed to the inner wall of the heat exchange box (1); the transmission member (15) is provided with two holes, the first hole (15-1) is sleeved on the reciprocating screw (14), and the second hole (15-2) is sleeved on the limit rod (16), the two ends of the limit rod (16) are respectively fixed to the inner wall of the heat exchange box (1), and the reciprocating screw (14) and the limit rod (16) are parallel in position; the push plate (17) is fixed below the second hole (15-2) and is used to mix the water temperature in the heat exchange box (1) evenly; The motor (18) is installed on one side of the heat exchange box (1) connected to the recycling box (21), driving the pulley (19) to rotate; the belt (20) is arranged on the outside of the pulley (19) to drive the reciprocating screw (14) and the transmission member (15) to move.

7. A method for operating the waste heat recycling device of a power plant according to any one of claims 1 to 6, characterized in that: The specific steps include: S1. After the flue gas generated by combustion and power generation in a power plant enters the flue gas conveying pipe (3), it drives the transmission paddle (6) to rotate, and the transmission paddle (6) drives the shaft (5), the guide member (7) and the slide bar (12) to move in turn. The slide bar (12) slides in the guide groove (11), thereby driving the scraper (9) and the baffle (10) to reciprocate. The scraper (9) is closely attached to the filter plate (8) to collect the impurities filtered out; S2, the filtered flue gas enters the branch pipe (2), and the water in the heat exchange box (1) absorbs the heat in the flue gas. The motor (18) drives the flow-pushing plate to make reciprocating motion, so as to mix the water temperature in the heat exchange box (1) uniformly. S3, when the water temperature in the heat exchange box (1) increases, the heat exchange efficiency decreases, and the residual heat of the flue gas in the branch pipe (2) is absorbed by the recovery box (21); S4, when the feed door (13) is not in contact with the scraper (9), it is in a closed state under the action of the first spring (22) to prevent impurities in the storage box (26) from floating out. When the scraper (9) pushes the feed door (13), the feed door (13) turns over, the first spring (22) contracts, and after the scraper (9) enters the feed door (13), the baffle (10) overlaps with the cleaning member (25). The cleaning member (25) scrapes off the impurities on the surfaces of the scraper (9) and the baffle (10) and collects them in the storage box (26). The impurities in the storage box (26) are cleaned regularly by opening the bottom plate (27).

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