Heat energy device for utilizing flue gas waste heat of power plant

Abstract

The invention relates to the technical field of flue gas heat energy recycling, in particular to a power plant flue gas waste heat utilization heat energy device which comprises a boiler body, a smoke outlet pipe is fixedly connected to the top end of the boiler body, a smoke outlet is formed in the other end of the smoke outlet pipe, and the smoke outlet pipe is arranged to be in an L shape; a heat recovery pipe fixedly penetrates through the smoke outlet pipe, a cleaning and drying mechanism and a vibrating mechanism are arranged on the smoke outlet pipe and the heat recovery pipe, and a sweeping mechanism and a knocking mechanism are arranged on the vertical section of the smoke outlet pipe. The cleaning and drying mechanism comprises first threaded rods rotationally penetrating through the two sides, corresponding to the heat recovery pipe, of the smoke outlet pipe, and the spiral directions of the two first threaded rods are the same; the outer wall of the heat recovery pipe can be dried, so that heat of flue gas is recycled more sufficiently, the utilization rate is increased, the cleaned part can be preheated through hot air, waste of the heat of the flue gas can be reduced, and the utilization rate is further increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas heat energy recycling, and particularly relates to a heat energy device for flue gas waste heat utilization of a power plant. BACKGROUND

[0002] The boiler of a power plant is a key equipment of a thermal power plant, and is mainly used for converting chemical energy of fuel into heat energy, and then generating high-temperature and high-pressure steam to provide power for a steam turbine. The flue gas heat energy recycling device, also known as a flue gas economizer or a flue gas heat exchanger, is a device specially designed for recycling heat contained in high-temperature flue gas discharged in industrial production. Through a heat exchange process, the device transfers heat in the flue gas to other media (such as air, water, etc.), thereby realizing heat recycling and reuse.

[0003] In the prior art, circulating water is heated by burning coal in a heat station, and when black flue gas produced during combustion contacts a heat recovery pipe, water droplets are formed on the surface. When the water droplets are cleaned, a blowing method is used for cleaning. When blowing, larger water droplets can be blown down, but water droplets are still contained on the outer wall of the heat recovery pipe. Therefore, cleaning is not thorough, and the contained water droplets also affect heat transfer of the flue gas to the heat recovery pipe, thereby affecting heat energy recycling efficiency. In addition, since the flue gas is black, the blown water droplets fall on the inner wall of the flue gas outlet pipe and evaporate, resulting in formation of dirt on the inner wall of the flue gas outlet pipe, which is not convenient for cleaning. Evaporation of the water droplets consumes heat in the flue gas, thereby causing heat loss and resulting in insufficient heat. In addition, a large amount of smoke dust is contained in the flue gas, and the smoke dust covers the outer wall of the heat recovery pipe and also affects heat transfer efficiency. Therefore, cleaning operation is needed, but the outer wall cannot be completely cleaned during cleaning, and the residual smoke dust also affects subsequent heat transfer efficiency. SUMMARY

[0004] The present application aims to solve the problems in the background art, and provides a heat energy device for flue gas waste heat utilization of a power plant.

[0005] To achieve the above object, the technical scheme adopted by the present application is as follows: a heat energy device for flue gas waste heat utilization of a power plant, comprising a boiler body, wherein the top end of the boiler body is fixedly connected with a flue gas outlet pipe, the other end of the flue gas outlet pipe is provided with a flue gas outlet, the shape of the flue gas outlet pipe is set as L-shaped, a heat recovery pipe is fixedly penetrated through the flue gas outlet pipe, the flue gas outlet pipe and the heat recovery pipe are provided with a cleaning and drying mechanism and a vibration mechanism, and the vertical section of the flue gas outlet pipe is provided with a cleaning mechanism and a knocking mechanism. The cleaning and drying mechanism comprises first threaded rods rotating through both sides of the heat recovery pipes corresponding to the smoke outlet pipe, the two first threaded rods have the same screw direction, the outer walls of the two first threaded rods are threadedly connected with lifting plates, the two lifting plates are fixedly connected with a hollow plate, the heat recovery pipes penetrate through the hollow plate, the hollow plate is used for cleaning water droplets on the outer wall of the heat recovery pipe, and hot air flows through the hollow plate and performs drying treatment on the outer wall of the cleaned heat recovery pipe. The vibration mechanism comprises elastic plates fixedly connected to both sides of the lifting plates corresponding to the two ends of the hollow plate, and a plurality of vibration blocks fixedly connected to both sides of the lifting plates corresponding to the inner wall of the smoke outlet pipe, the lower part of the inner wall of the smoke outlet pipe corresponding to the hollow plate is provided as an inclined surface, and the elastic plates move up and down to hit the vibration blocks, so that the cleaned water droplets are quickly discharged along the inclined surface.

[0006] Preferably, the cleaning and drying mechanism further comprises notches opened at both sides of the rear end of the horizontal section of the smoke outlet pipe, sealing plates are connected to the inner walls of the two notches through sealing mechanisms, air inlet pipes and air outlet pipes are respectively fixedly penetrated on the two sealing plates, the air inlet pipes and the air outlet pipes are fixedly connected with and communicated with the hollow plate, motors are fixedly connected to both sides of the horizontal section of the smoke outlet pipe corresponding to the heat recovery pipes, and the driving ends of the two motors and the two first threaded rods are respectively fixedly connected.

[0007] Preferably, the sealing mechanism comprises sealing frames fixedly connected to both ends of the notches, sealing strips are arranged on the inner walls of the two groups of sealing frames, and the two groups of sealing strips and the two sealing plates are respectively fixedly connected.

[0008] Preferably, a filter plate is arranged on the inner wall of the vertical section of the smoke outlet pipe, a fixed plate is fixedly connected to the filter plate, the fixed plate penetrates through the smoke outlet pipe, a limiting plate is fixedly connected to the upper part of the fixed plate on the outer wall of the vertical section of the smoke outlet pipe, and the limiting plate and the fixed plate are fixed together through a plurality of first bolts.

[0009] Preferably, the cleaning mechanism comprises sliding grooves opened at both sides of the inner wall of the vertical section of the smoke outlet pipe corresponding to the lower part of the filter plate, cleaning plates are slidingly connected to the inner walls of the two sliding grooves, and brush hairs are fixedly installed on the top ends of the cleaning plates.

[0010] Preferably, the cleaning mechanism further comprises a second threaded rod rotatingly penetrating through the inner wall of one sliding groove, the second threaded rod is threadedly connected with the cleaning plate, and a first belt pulley is fixedly connected to one end of the second threaded rod.

[0011] Preferably, the cleaning mechanism further comprises a transmission shaft I fixedly connected to one side of the bottom end of the first threaded rod, the bottom end of the transmission shaft I is fixedly connected with a first bevel gear, the outer diameter of the first bevel gear is meshingly connected with a second bevel gear, one end of the second bevel gear is fixedly connected with a transmission shaft II, the outer wall of the transmission shaft II is fixedly connected with a second belt pulley near the position of the smoke outlet pipe, and the diameter of the second belt pulley is greater than that of the first belt pulley.

[0012] Preferably, the transmission shaft II is rotatably connected with the smoke outlet pipe, and a supporting rod is rotatably connected to the outer wall of the transmission shaft II near the position of the second bevel gear.

[0013] Preferably, the knocking mechanism comprises a circular block fixedly connected to the other end of the second threaded rod, a plurality of mounting grooves are formed in the outer wall of the circular block, a mounting block is arranged on the inner wall of each mounting groove, each mounting block and the circular block are fixed by a second bolt, an elastic rod is fixedly connected to one end of the outer side of each mounting block, and a knocking ball is fixedly connected to one end of the outer side of each elastic rod.

[0014] Preferably, a vibrating plate is fixedly connected to one side of the circular block corresponding to one end of the smoke outlet pipe, and the knocking ball hits the vibrating plate to generate vibration.

[0015] Compared with the prior art, the present application has the following beneficial effects: 1. The cleaning and drying mechanism can clean the water droplets on the heat recovery pipe through the hollow plate, and the hot air is sent into the hollow plate through the air inlet pipe, so that the part that has been cleaned of water droplets can be dried, thereby avoiding the residual water on the outer wall of the heat recovery pipe, fully recycling the heat of the flue gas, improving the utilization rate, and preheating the cleaned part through the hot air, thereby reducing the waste of flue gas heat and further improving the utilization rate. 2. The vibration mechanism can make the cleaned water droplets flow faster along the inclined surface, thereby preventing the water droplets from staying in the smoke outlet pipe for too long, avoiding the use of flue gas heat, reducing heat loss, fully utilizing flue gas heat, and avoiding the evaporation of water droplets on the inner wall of the smoke outlet pipe to form dirt, which avoids cleaning. 3. The cleaning mechanism can clean the dust attached to the filter plate, prevent the filter plate from being blocked by dust, and avoid affecting the flow of flue gas, and the flue gas after filtration can avoid the attachment of dust when acting on the heat recovery pipe, thereby more efficiently utilizing the heat of the flue gas. 4. The set-in tapping mechanism can cause the vibrating plate to vibrate by tapping the ball, thus shaking off the dust attached to the filter plate, thereby further ensuring the flow of flue gas. The elastic rod used can be disassembled and replaced to prevent the elastic rod from aging and losing its elasticity, which would affect the subsequent tapping effect. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of a thermal energy device for utilizing waste heat from power plant flue gas according to the present invention. Figure 2 This invention relates to a thermal energy device for utilizing waste heat from flue gas in power plants. Figure 1 Enlarged view of point A in the middle; Figure 3 This is a bottom view of the flue gas outlet pipe of a thermal energy device for utilizing waste heat from power plant flue gas according to the present invention. Figure 4 This invention relates to a thermal energy device for utilizing waste heat from flue gas in power plants. Figure 3 Enlarged view at point B in the middle; Figure 5 This invention relates to a thermal energy device for utilizing waste heat from flue gas in power plants. Figure 3 Enlarged view at point C; Figure 6 This is a cross-sectional view of the vertical section of the flue gas outlet pipe of a thermal energy device for utilizing waste heat from power plant flue gas according to the present invention. Figure 7 This invention relates to a thermal energy device for utilizing waste heat from flue gas in power plants. Figure 6 Enlarged view at point D; Figure 8 This is a vertical sectional view of the horizontal section of the flue gas outlet pipe of a thermal energy device for utilizing waste heat from power plant flue gas according to the present invention. Figure 9 This is a vertical sectional view of the flue gas outlet pipe of a thermal energy device for utilizing waste heat from power plant flue gas according to the present invention. Figure 10 This is a structural diagram of a circular block of a thermal energy device for utilizing waste heat from flue gas in a power plant, according to the present invention. Figure 11 This is a partial structural exploded view of a thermal energy device for utilizing waste heat from power plant flue gas according to the present invention.

[0017] In the figure: 1, boiler body; 2, smoke outlet pipe; 3, smoke outlet; 4, heat recovery pipe; 5, first threaded rod; 6, lifting plate; 7, hollow plate; 8, elastic plate; 9, vibration block; 10, sealing plate; 11, air inlet pipe; 12, air outlet pipe; 13, motor; 14, sealing frame; 15, sealing strip; 16, filter plate; 17, fixed plate; 18, limiting plate; 19, sliding groove; 20, cleaning plate; 21, brush; 22, second threaded rod; 23, first belt pulley; 24, transmission shaft one; 25, first bevel gear; 26, second bevel gear; 27, transmission shaft two; 28, second belt pulley; 29, support rod; 30, round block; 31, mounting groove; 32, mounting block; 33, elastic rod; 34, knocking ball; 35, vibrating plate. DETAILED DESCRIPTION

[0018] The following description is used to disclose the present application so that those skilled in the art can implement the present application. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art.

[0019] As Figures 1-11 shown in a power plant flue gas waste heat utilization heat energy device, including boiler body 1, boiler body 1 top fixedly connected with smoke outlet pipe 2, the other end of smoke outlet pipe 2 is provided with smoke outlet 3, the shape of smoke outlet pipe 2 is set as L-shaped, the smoke outlet pipe 2 is fixedly penetrated with heat recovery pipe 4, the heat recovery pipe 4 is set as S-shaped, by injecting condensate into the heat recovery pipe 4 and heating the condensate in the heat recovery pipe 4, the cleaning and drying mechanism and the vibration mechanism are arranged on the smoke outlet pipe 2 and the heat recovery pipe 4, the cleaning mechanism and the knocking mechanism are arranged on the vertical section of the smoke outlet pipe 2, the cleaning and drying mechanism can be heated and dried when cleaning the water droplets on the heat recovery pipe 4, ensuring the dryness of the cleaning part, so that the heat in the flue gas can be better utilized, the vibration mechanism can make the cleaned water droplets flow out of the smoke outlet pipe 2 quickly, reducing the loss of heat, the cleaning mechanism can clean the bottom end of the filter plate 16, preventing the filter plate 16 from being blocked, and the knocking mechanism can clean the filter plate 16 again, improving the filtering effect and reducing the attachment of dust on the heat recovery pipe 4; As Figure 8 , Figure 9As shown, the cleaning and drying mechanism comprises two first threaded rods 5 rotating through the two sides of the heat recovery pipe 4 corresponding to the smoke outlet pipe 2, the two first threaded rods 5 have the same screw direction, the outer walls of the two first threaded rods 5 are both threadedly connected with a lifting plate 6, the two lifting plates 6 are fixedly connected with a hollow plate 7, the heat recovery pipe 4 penetrates through the hollow plate 7, the hollow plate 7 is used for cleaning the water droplets on the outer wall of the heat recovery pipe 4, hot air flows through the hollow plate 7 and the outer wall of the heat recovery pipe 4 is dried after cleaning, and the two first threaded rods 5 rotate synchronously, so that the lifting plate 6 moves up and down, and a sealing bearing is connected between the first threaded rod 5 and the smoke outlet pipe 2. As shown in Figure 8 , Figure 9 As shown, the vibration mechanism comprises a plurality of elastic plates 8 fixedly connected on the two ends of the hollow plate 7 corresponding to the two sides of the lifting plate 6, and a plurality of vibration blocks 9 fixedly connected on the inner wall of the smoke outlet pipe 2 corresponding to the two sides of the lifting plate 6, the inner wall of the smoke outlet pipe 2 corresponding to the lower part of the hollow plate 7 is provided as an inclined surface, and the water droplets cleaned by the elastic plate 8 are quickly discharged along the inclined surface when the elastic plate 8 moves up and down and hits the vibration block 9.

[0020] As shown in Figure 1 , Figure 2 , Figure 6 , Figure 8 As shown, the cleaning and drying mechanism further comprises notches opened on both sides of the rear end of the horizontal section of the smoke outlet pipe 2, the inner walls of the two notches are both connected with a sealing plate 10 through a sealing mechanism, the two sealing plates 10 are respectively fixedly penetrated with an air inlet pipe 11 and an air outlet pipe 12, the air inlet pipe 11 and the air outlet pipe 12 are both fixedly connected with and communicated with the hollow plate 7, the top end of the horizontal section of the smoke outlet pipe 2 corresponding to the two sides of the heat recovery pipe 4 is fixedly connected with a motor 13, and the driving ends of the two motors 13 are respectively fixedly connected with the two first threaded rods 5. The notches can make the sealing plate 10 move up and down, and the sealing plate 10 moves up and down with the air inlet pipe 11 and the air outlet pipe 12, in order to ensure the sealing effect at the moving position, the sealing mechanism is used to prevent the smoke from flowing out of the connection, to ensure the full use of the smoke, and through the synchronous controller to control the two motors 13, so that the motor 13 rotates synchronously, and the rotating speed of the two first threaded rods 5 is consistent.

[0021] As shown in Figure 1 , Figure 2 The sealing mechanism comprises a sealing frame 14 fixedly connected on both ends of the notch, the inner walls of the two groups of sealing frames 14 are both provided with a sealing strip 15, and the two groups of sealing strips 15 and the two sealing plates 10 are respectively fixedly connected. The sealing frame 14 and the sealing strip 15 in the sealing mechanism are both made of high-temperature-resistant ceramic material, so as to prevent damage during use and prolong the service life.

[0022] As shown in Figure 6 , Figure 11As shown, the inner wall of the vertical section of the smoke outlet pipe 2 is provided with a filter plate 16, and the filter plate 16 is fixedly connected with a fixed plate 17, the fixed plate 17 penetrates the smoke outlet pipe 2, and the outer wall of the vertical section of the smoke outlet pipe 2 is fixedly connected with a limiting plate 18 above the fixed plate 17, and the limiting plate 18 and the fixed plate 17 are fixed together by a plurality of first bolts. A placing groove for placing the filter plate 16 is formed on the inner wall of the smoke outlet pipe 2 away from the fixed plate 17, so that the filter plate 16 can be limited, and then the fixed plate 17 can be installed and fixed by the limiting plate 18 and the first bolts, and can be disassembled and replaced, so as to ensure the filtering effect.

[0023] As shown in Figure 6 , Figure 7 , the cleaning mechanism includes a chute 19 formed on both sides of the inner wall of the vertical section of the smoke outlet pipe 2 below the filter plate 16, and a cleaning plate 20 is slidably connected in the inner wall of the chute 19, and a brush 21 is fixedly installed at the top end of the cleaning plate 20. The cleaning plate 20 can slide in the chute 19, so that the brush 21 can move, and the filter plate 16 can be cleaned by the brush 21, so as to ensure the filtering performance of the filter plate 16, so that the smoke without dust can pass through, and the dust is prevented from adhering to the outer wall of the heat recovery pipe 4, so as to ensure the heat exchange efficiency.

[0024] As shown in Figure 7 , the cleaning mechanism further includes a second threaded rod 22 rotatably penetrating the inner wall of one side of the chute 19, and the second threaded rod 22 is threadedly connected with the cleaning plate 20, and one end of the second threaded rod 22 is fixedly connected with a first belt pulley 23. The threaded rod of the second threaded rod 22 can move the cleaning plate 20, so as to complete the cleaning operation.

[0025] As shown in Figure 3 , Figure 4 , Figure 5 , the cleaning mechanism further includes a transmission shaft one 24 fixedly connected to the bottom end of the first threaded rod 5 on one side, a first bevel gear 25 fixedly connected to the bottom end of the transmission shaft one 24, a second bevel gear 26 meshingly connected to the outer diameter of the first bevel gear 25, a transmission shaft two 27 fixedly connected to one end of the second bevel gear 26, and a second belt pulley 28 fixedly connected to the outer wall of the transmission shaft two 27 close to the smoke outlet pipe 2, and the diameter of the second belt pulley 28 is greater than that of the first belt pulley 23. The first threaded rod 5 rotates with the transmission shaft one 24, so that the first bevel gear 25 and the second bevel gear 26 can rotate, and the second bevel gear 26 rotates with the transmission shaft two 27, so that the second belt pulley 28 can rotate, and the second belt pulley 28 rotates with the first belt pulley 23 through the belt. Since the diameter of the second belt pulley 28 is greater than that of the first belt pulley 23, when the lifting plate 6 rises to the top, the cleaning plate 20 can move from one side to the other side, and the cleaning operation is completed.

[0026] As shown in Figure 5As shown, the second drive shaft 27 and the smoke outlet pipe 2 are rotatably connected. A support rod 29 is rotatably connected to the outer wall of the second drive shaft 27 near the second bevel gear 26. The support rod 29 is fixedly connected to the smoke outlet pipe 2. The second drive shaft 27 can be limited by the smoke outlet pipe 2 and the support rod 29.

[0027] like Figure 10 As shown, the striking mechanism includes a circular block 30 fixedly connected to the other end of the second threaded rod 22. The outer wall of the circular block 30 is provided with multiple mounting grooves 31. Each mounting groove 31 has a mounting block 32 on its inner wall. Each mounting block 32 and the circular block 30 are fixedly connected by a second bolt. An elastic rod 33 is fixedly connected to one outer end of each mounting block 32. A striking ball 34 is fixedly connected to one outer end of each elastic rod 33. A vibrating plate 35 is fixedly connected to one side of the smoke pipe 2 corresponding to the side of the circular block 30. The striking ball 34 strikes the vibrating plate 35 to generate vibration. The elastic rod 33 can be disassembled and replaced through the mounting slot 31 and mounting block 32, thereby preventing the elastic rod 33 from aging and losing its elasticity, which would affect the subsequent striking effect. The second threaded rod 22 rotates the circular block 30. Since the elastic rod 33 can be bent, it can strike the vibrating plate 35 through the striking ball 34. When the vibrating plate 35 vibrates, it will be transmitted to the filter plate 16 through the smoke outlet pipe 2. Therefore, the smoke dust attached to the bottom of the filter plate 16 can be vibrated and cleaned, ensuring the filtering effect of the filter plate 16, and thus making full use of the heat in the flue gas.

[0028] Working principle: First, the synchronous controller controls the motor 13, causing it to run synchronously and rotate the first threaded rod 5 synchronously. Since the two first threaded rods 5 have the same spiral direction, the thread effect of the first threaded rods 5 can make the lifting plate 6 rise synchronously. The lifting plate 6 will then carry the hollow plate 7 upward to clean the water droplets on the outer wall of the heat recovery pipe 4. During cleaning, hot air is injected into the hollow plate 7 through the air inlet pipe 11. The hot air can evaporate the moisture remaining on the outer wall of the heat recovery pipe 4, ensuring the dryness of the outer wall of the heat recovery pipe 4. Therefore, the flue gas can be fully utilized. The heat in the tube can be preheated by hot air to reduce heat waste. When the hollow plate 7 rises, it carries the elastic plate 8 up synchronously. Since the elastic plate 8 is elastic, it will deform. Therefore, when it enters the next interval, the elastic plate 8 will reset and hit the next vibrating block 9, thus generating vibration. The vibration will make the cleaned water droplets flow quickly along the inclined surface and be discharged through the exhaust port 3. Therefore, the time of water droplets in the exhaust pipe 2 can be reduced, thus preventing the water droplets from evaporating and consuming heat in the exhaust pipe 2, thereby avoiding heat loss. Further, the first threaded rod 5 on one side rotates with the transmission shaft 24 and the first bevel gear 25, the first bevel gear 25 rotates with the second bevel gear 26, the second bevel gear 26 rotates with the transmission shaft 27 and the second pulley 28, the second pulley 28 rotates with the first pulley 23 through the belt, since the diameter of the second pulley 28 is larger than that of the first pulley 23, the first pulley 23 is in an accelerated state, therefore the rotating speed of the second threaded rod 22 is greater than that of the transmission shaft 27, through the threaded effect of the second threaded rod 22, the cleaning plate 20 can be moved, when the lifting plate 6 rises to the top, the cleaning plate 20 moves to both sides of the chute 19, thereby the cleaning of the filter plate 16 can be completed, the filtering effect of the filter plate 16 is ensured, at the same time, the second threaded rod 22 rotates with the circular block 30, the circular block 30 rotates with the mounting block 32, the elastic rod 33 and the knocking ball 34, since the elastic rod 33 has elasticity and can be deformed, the vibration plate 35 can be knocked and vibrated, thereby the smoke dust on the filter plate 16 can be further shaken down, the cleaning operation of the filter plate 16 is completed, and the smoke gas can be continuously filtered, the smoke gas without smoke dust is passed, the smoke dust is avoided to cover on the heat recovery pipe 4, thereby the heat transfer efficiency of the heat recovery pipe 4 can be further improved, the elastic rod 33 is arranged to be detachable, therefore the aging elastic rod 33 can be replaced, the subsequent knocking operation is avoided to be affected.

[0029] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only the principles of the present application, various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A thermal energy device for utilizing waste heat from flue gas in a power plant, comprising a boiler body (1), characterized in that: The top of the boiler body (1) is fixedly connected to a flue pipe (2), and the other end of the flue pipe (2) is provided with a flue outlet (3). The flue pipe (2) is L-shaped, and a heat recovery pipe (4) is fixedly passed through the flue pipe (2). A cleaning and drying mechanism and a vibration mechanism are provided on the flue pipe (2) and the heat recovery pipe (4). A sweeping mechanism and a knocking mechanism are provided on the vertical section of the flue pipe (2). The cleaning and drying mechanism includes a first threaded rod (5) that rotates through both sides of the heat recovery pipe (4) corresponding to the smoke outlet pipe (2). The two first threaded rods (5) have the same spiral direction. The outer walls of the two first threaded rods (5) are threaded with lifting plates (6). A hollow plate (7) is fixedly connected between the two lifting plates (6). The heat recovery pipe (4) passes through the hollow plate (7). The hollow plate (7) is used to clean the water droplets on the outer wall of the heat recovery pipe (4). Hot air circulates inside the hollow plate (7) and dries the outer wall of the cleaned heat recovery pipe (4). The vibration mechanism includes elastic plates (8) fixedly connected to both ends of the hollow plate (7) corresponding to the two sides of the lifting plate (6), and multiple vibration blocks (9) fixedly connected to both sides of the inner wall of the smoke outlet pipe (2) corresponding to the two sides of the lifting plate (6). The inner wall of the smoke outlet pipe (2) is set as an inclined surface below the hollow plate (7). When the elastic plate (8) moves up and down to hit the vibration block (9), the water droplets that are cleaned are quickly discharged along the inclined surface.

2. The thermal energy device for utilizing waste heat from power plant flue gas according to claim 1, characterized in that: The cleaning and drying mechanism also includes notches on both sides of the rear end of the horizontal section of the smoke outlet pipe (2). The inner walls of the two notches are connected to sealing plates (10) by sealing mechanisms. An air inlet pipe (11) and an air outlet pipe (12) are fixedly connected to the two sealing plates (10). The air inlet pipe (11) and the air outlet pipe (12) are fixedly connected to and communicate with the hollow plate (7). Motors (13) are fixedly connected to both sides of the top of the horizontal section of the smoke outlet pipe (2) corresponding to the heat recovery pipe (4). The driving ends of the two motors (13) and the two first threaded rods (5) are fixedly connected respectively.

3. A thermal energy device for utilizing waste heat from power plant flue gas according to claim 2, characterized in that: The sealing mechanism includes sealing frames (14) fixedly connected to both ends of the notch. The inner walls of the two sets of sealing frames (14) are provided with sealing strips (15). The two sets of sealing strips (15) and two sealing plates (10) are fixedly connected respectively.

4. A thermal energy device for utilizing waste heat from power plant flue gas according to claim 1, characterized in that: A filter plate (16) is provided on the inner wall of the vertical section of the smoke outlet pipe (2). A fixing plate (17) is fixedly connected to the filter plate (16). The fixing plate (17) passes through the smoke outlet pipe (2). A limiting plate (18) is fixedly connected above the fixing plate (17) on the outer wall of the vertical section of the smoke outlet pipe (2). The limiting plate (18) and the fixing plate (17) are fixed together by multiple first bolts.

5. A thermal energy device for utilizing waste heat from power plant flue gas according to claim 4, characterized in that: The cleaning mechanism includes grooves (19) on both sides of the inner wall of the vertical section of the smoke outlet pipe (2) corresponding to the filter plates (16) below. The inner walls of the two grooves (19) are slidably connected to cleaning plates (20), and brush bristles (21) are fixedly installed on the top of the cleaning plates (20).

6. A thermal energy device for utilizing waste heat from power plant flue gas according to claim 1, characterized in that: The cleaning mechanism also includes a second threaded rod (22) that rotates through the inner wall of a side groove (19). The second threaded rod (22) is threadedly connected to the cleaning plate (20), and a first pulley (23) is fixedly connected to one end of the second threaded rod (22).

7. A thermal energy device for utilizing waste heat from power plant flue gas according to claim 6, characterized in that: The cleaning mechanism also includes a drive shaft (24) fixedly connected to the bottom end of the first threaded rod (5) on one side. A first bevel gear (25) is fixedly connected to the bottom end of the drive shaft (24). A second bevel gear (26) is meshed with the outer diameter of the first bevel gear (25). A drive shaft (27) is fixedly connected to one end of the second bevel gear (26). A second pulley (28) is fixedly connected to the outer wall of the drive shaft (27) near the smoke outlet pipe (2). The diameter of the second pulley (28) is larger than the diameter of the first pulley (23).

8. A thermal energy device for utilizing waste heat from power plant flue gas according to claim 7, characterized in that: The second drive shaft (27) and the smoke outlet pipe (2) are rotatably connected. A support rod (29) is rotatably connected to the outer wall of the second drive shaft (27) near the second bevel gear (26). The support rod (29) and the smoke outlet pipe (2) are fixedly connected.

9. A thermal energy device for utilizing waste heat from power plant flue gas according to claim 6, characterized in that: The striking mechanism includes a circular block (30) fixedly connected to the other end of the second threaded rod (22). The outer wall of the circular block (30) is provided with a plurality of mounting grooves (31). Each mounting groove (31) is provided with a mounting block (32) on its inner wall. Each mounting block (32) and the circular block (30) are fixedly connected by a second bolt. An elastic rod (33) is fixedly connected to one end of the outer side of each mounting block (32). A striking ball (34) is fixedly connected to one end of the outer side of each elastic rod (33).

10. A thermal energy device for utilizing waste heat from power plant flue gas according to claim 9, characterized in that: A vibrating plate (35) is fixedly connected to one end of the smoke outlet pipe (2) corresponding to one side of the circular block (30), and the striking ball (34) vibrates by striking the vibrating plate (35).

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