A boiler waste heat recovery device

Abstract

The utility model discloses a boiler waste heat recovery device, including base, the vertical downward of base center axis, and the bottom end central part of base is connected with the connecting pipe for the smoke of penetration, and the top fixedly connected with the heating cover of base, and the inside of heating cover adopts the openwork structure, and the inner wall fixedly connected with the heating pipe of heating cover, and heating pipe with the inside of heating cover is communicated, and the bottom fixedly connected with the heating bin of heating pipe, and the top penetration of heating bin is connected with the straight pipe, and this device is designed as three -dimensional structure, can directly with the exhaust pipe upper end of boiler connects, reduces the floor space, and the outer wall passes through annular water flow passageway, can reach the role of insulating external environment temperature, keeps the internal heat not from the side wall and loses, and the circulating structure of inside can reduce the speed of water flow circulation, and then utilize direct contact upper layer hot flue gas reaches the recovery effect of last flue gas waste heat, utilizes a plurality of design structures to reach the maximum efficiency of waste heat recovery, makes the use process of equipment more stable.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically to a boiler waste heat recovery device. Background Technology

[0002] A boiler waste heat recovery device is a device that absorbs heat from boiler flue gas. It uses a heat-conducting medium flowing through heat exchange tubes to displace the heat contained in the flue gas and reuse it. However, during heat exchange, particulate matter in the flue gas gradually adheres to the surface of the heat exchange tubes. This thickening of the impurities affects heat exchange and reduces waste heat recovery efficiency.

[0003] Traditional boiler waste heat recovery devices often adopt a square barrel structure, with flue gas inlet and outlet ports at the front and rear ends. The interior of the structure is equipped with multiple longitudinally designed water pipes. The flue gas circulates inside the square barrel structure and comes into contact with the water pipes. The water inside the pipes circulates to achieve the function of waste heat recovery.

[0004] However, traditional boiler waste heat recovery devices often use a horizontal structure connected to the air intake channel. As the flue gas flows through the device, particulate matter in the flue gas tends to accumulate at the bottom due to its weight, while the top of the device is prone to air short-circuiting because it is separated from the main airflow path. After long-term operation, this can easily cause blockage, affecting heat exchange efficiency and equipment stability. At the same time, the horizontal layout of the device results in a large footprint, and the boiler exhaust pipe needs to be designed with multiple sets of pipes to connect to the horizontal waste heat recovery device, which increases the flue gas flow path and makes it easy for heat energy to be lost during the flow process. Utility Model Content

[0005] The technical problem this invention aims to solve is that the flat-lying equipment occupies a large area, and the boiler exhaust pipe requires multiple sets of pipes to be designed to connect the flat-lying waste heat recovery device, which increases the flue gas flow path and makes it easy to lose heat energy during the flow process.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a boiler waste heat recovery device, including a base, the central axis of the base is vertically arranged, a connecting pipe for flue gas inlet is connected through the center of the bottom end of the base, a heating cover is fixedly connected to the top of the base, the interior of the heating cover adopts a hollow structure, a heating pipe is fixedly connected to the inner wall of the heating cover and the heating pipe communicates with the interior of the heating cover, a heating chamber is fixedly connected to the bottom end of the heating pipe, a straight pipe is connected through the top of the heating chamber, a heat exchange cylinder is fixedly connected to the top of the straight pipe, an outer shell is fitted onto the outside of the heat exchange cylinder, and the bottom end of the outer shell is fixedly connected to the top of the heating cover, a top cover is fixedly connected to the top of the outer shell, and a flue gas outlet pipe for exhausting flue gas is provided on the side of the top cover.

[0007] Furthermore, a cold water pipe for water inlet is provided on the side of the heating hood, and a hot water pipe for water outlet is provided on the side of the heat exchange cylinder. The heat exchange cylinder adopts a honeycomb structure in shape, and the interior of the heat exchange cylinder has a hollow structure. The bottom end of the heat exchange cylinder is connected to the top of the straight pipe.

[0008] Furthermore, the cold water pipe is located at the upper end of the heating cover, the inner wall of the heating cover is provided with heat insulation sheet, and the top of the heat insulation sheet is fixedly connected to the top of the inner wall of the heating cover. There are four sets of heating pipes, and all four sets of heating pipes are designed to be spirally gathered inward. The heating chamber connected to the bottom end of the heating pipe is set as a hemispherical hollow structure, and the heating chamber is located at the top of the connecting pipe.

[0009] Furthermore, several sets of cleaning rods are slidably connected to the top of the top cover. A straight rod is fixedly connected to the top of the cleaning rod via a bracket. A pressure cover is slidably connected to the outside of the straight rod, and the side of the pressure cover is fixedly connected to the side of the outer shell. A piston is fixedly connected to the side of the straight rod, and the piston slides inside the inner wall of the pressure cover. A telescopic spring is provided in the gap between the pressure cover and the piston. An air pipe is connected through the bottom end of the pressure cover, and a cleaning ring is fixedly connected to the end of the air pipe away from the pressure cover.

[0010] Furthermore, the air pipes are configured in two sets, with the cleaning rings connected to the ends of the two sets of air pipes located at the upper and lower ends of the inner side of the heating hood, respectively.

[0011] Furthermore, a cleaning mechanism is fitted around the heating tube, and a second telescopic spring is provided on the side of the cleaning mechanism. A ring plate is fixedly connected to the end of the second telescopic spring away from the heating tube. The side of the ring plate is fixedly connected to the side of the straight rod through a bracket, and a protective cover is fitted around the connection between the straight rod and the second telescopic spring. The side of the protective cover is fixedly connected to the side of the heating cover.

[0012] Furthermore, the cleaning mechanism includes a sleeve, the inner wall of which is slidably connected to the outer side of the heating tube, several sets of rollers are rotatably connected inside the sleeve, and several sets of brushes are fixedly connected to the inner side of the sleeve.

[0013] Furthermore, the top of the top cover is designed to be detachable, and the bottom of the top cover covers the upper end of the heat exchange cylinder.

[0014] The advantages of this utility model compared with the prior art are as follows:

[0015] (1) This device is designed as a three-dimensional structure, which can be directly connected to the upper end of the boiler's flue pipe, reducing the floor space. The outer wall is connected to the inner side of the rising flue gas passage through a ring-shaped water flow path to achieve heat exchange treatment. The outer side of the outer wall is first in contact with the injected cold water, which can isolate the external ambient temperature and prevent the internal heat from being lost from the side. At the same time, the internal circulation structure can slow down the flow of water and retain and heat it. Then, the waste heat of the flue gas is recovered by directly contacting the upper hot flue gas. The multiple design structures achieve the maximum efficiency of waste heat recovery, making the equipment more stable in use.

[0016] (2) This device can clean and scrape the contact surface of flue gas by pressing it with personnel and using the synchronous movement of the internal structure, so that the internal surface of the equipment can be cleaned and the surface of the device can directly contact the flue gas for heat exchange. Compared with the traditional sealed structure that makes it impossible for personnel to clean, the operation process is simple and quick, which facilitates personnel cleaning and maintenance, indirectly increases the service life of the equipment and reduces the operating cost of waste heat recovery for enterprises. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the boiler waste heat recovery device of this utility model.

[0018] Figure 2 This is a schematic diagram of the boiler waste heat recovery device of this utility model from the left side.

[0019] Figure 3 This is a schematic diagram of the overall cross-sectional structure of the boiler waste heat recovery device of this utility model.

[0020] Figure 4 This is a schematic diagram of the boiler waste heat recovery device in the ash removal state.

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the heating cover of the boiler waste heat recovery device of this utility model.

[0022] Figure 6 This is a schematic diagram of the heating tube structure of the boiler waste heat recovery device of this utility model.

[0023] Figure 7 This is a schematic diagram of the overall structure of the cleaning mechanism of the boiler waste heat recovery device of this utility model.

[0024] Figure 8 This is a schematic diagram of the cross-sectional structure of the pressure cover of the boiler waste heat recovery device of this utility model.

[0025] As shown in the figure: 1. Base; 2. Connecting pipe; 3. Heating cover; 4. Cold water pipe; 5. Heat insulation sheet; 6. Heating tube; 7. Heating chamber; 8. Straight pipe; 9. Heat exchange cylinder; 10. Hot water pipe; 11. Outer shell; 12. Top cover; 13. Smoke outlet pipe; 14. Cleaning rod; 15. Straight rod; 16. Pressure cover; 17. Piston; 18. Telescopic spring one; 19. Air pipe; 20. Cleaning ring; 21. Cleaning mechanism; 2101. Sleeve; 2102. Roller; 2103. Brush; 22. Telescopic spring two; 23. Ring plate; 24. Protective cover. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] Combined with appendix Figure 1 A boiler waste heat recovery device includes a base 1 with a vertically aligned central axis. The bottom end of the base 1 can be directly connected to the boiler exhaust pipe, and the sides of the base 1 can be fixed by a bracket. A connecting pipe 2 for flue gas inlet is connected through the center of the bottom end of the base 1. The connecting pipe 2 is fixed to the pipe opening of the exhaust pipe by bolts. A heating cover 3 is fixedly connected to the top of the base 1. The interior of the heating cover 3 has a hollow structure, allowing cold water to be received inside and directly contacting the flue gas through the inner wall of the heating cover 3. To achieve primary heat exchange, a heating pipe 6 is fixedly connected to the inner wall of the heating cover 3, and the heating pipe 6 communicates with the interior of the heating cover 3. A heating chamber 7 is fixedly connected to the bottom end of the heating pipe 6. A straight pipe 8 is connected through the top of the heating chamber 7. A heat exchange cylinder 9 is fixedly connected to the top of the straight pipe 8. An outer shell 11 is fitted onto the outside of the heat exchange cylinder 9, and the bottom end of the outer shell 11 is fixedly connected to the top of the heating cover 3. A top cover 12 is fixedly connected to the top of the outer shell 11, and a smoke exhaust pipe 13 is provided on the side of the top cover 12 for exhausting smoke.

[0028] refer to Figure 3 and Figure 4When the device is running, the high-temperature flue gas from the boiler is injected into the base 1 through the connecting pipe 2 and rises. Simultaneously, the cold water pipe 4 injects cold water into the heating hood 3. Subsequently, the meandering water flow inside the heating hood 3 comes into contact with the rising flue gas on the inner side of the heating hood 3, achieving primary heat exchange. Then, the heating hood 3 injects water into the heating chamber 7 through the heating pipe 6. Because the heating pipe 6 is designed with a spiral structure and is located inside the heating hood 3, the outer periphery of the heating pipe 6 can fully contact the rising flue gas to achieve further heating. The purpose is to collect water into the heating chamber 7 through the heating pipe 6. Since the heating chamber 7 is located directly above the connecting pipe 2, the water inside the heating chamber 7 is reheated. Then, the hot water enters the heat exchange cylinder 9 through the straight pipe 8 by water pressure. The flue gas flowing inside the heating hood 3 finally rises and flows through the honeycomb holes inside the heat exchange cylinder 9, and recovers the waste heat of the water inside the heat exchange cylinder 9 for the last time, realizing the function of multiple waste heat recovery and maximizing the recovery of waste heat from the flue gas. Finally, the heat exchange cylinder 9 discharges the hot water after heat exchange through the hot water pipe 10 for recycling.

[0029] refer to Figure 1 The device is designed as a three-dimensional structure, which can be directly connected to the upper end of the boiler's flue gas pipe, reducing the floor space. The heating hood 3 uses a meandering water flow path to allow the inner side of the heating hood 3 to directly contact the side wall of the rising flue gas channel for heat exchange. The outer side of the outer wall, because it first comes into contact with the injected cold water, can achieve the function of isolating the external ambient temperature and preventing the internal heat from being lost from the outer side of the heating hood 3. At the same time, the circulation structure composed of the internal heating pipe 6, heating chamber 7 and straight pipe 8 can reduce the water flow speed and retain and heat it. Then, by directly contacting the upper hot flue gas, the final waste heat of the flue gas is recovered. The use of multiple sets of design structures achieves the maximum efficiency of waste heat recovery, making the operation of the equipment more stable.

[0030] refer to Figure 4 In a specific implementation of this utility model, a cold water pipe 4 for water inlet is provided on the side of the heating cover 3, and a hot water pipe 10 for water outlet is provided on the side of the heat exchange cylinder 9, so as to realize the circulation of water in the whole device and realize the heat exchange of water to the flue gas. The heat exchange cylinder 9 adopts a honeycomb structure. The honeycomb holes inside the heat exchange cylinder 9 provide a passage for the rising airflow and increase the contact area between the water and the hot flue gas inside the heat exchange cylinder 9, thereby improving the heat exchange efficiency at the top of the rising airflow. The interior of the heat exchange cylinder 9 is a hollow structure, and the bottom end of the heat exchange cylinder 9 is connected to the top of the straight pipe 8.

[0031] refer to Figure 5In a specific implementation of this utility model, the cold water pipe 4 is located at the upper end of the heating cover 3. The inner wall of the heating cover 3 is provided with a heat insulation sheet 5, and the top of the heat insulation sheet 5 is fixedly connected to the top of the inner wall of the heating cover 3. The heat insulation sheet 5 is made of heat insulation material to ensure that the hot water inside the heating cover 3 will not directly contact the outside of the heating cover 3 and cause heat loss. There are four sets of heating pipes 6. All four sets of heating pipes 6 are designed in a spiral inward convergence shape to extend the path length of water flow in the heating pipes 6 and increase the water's full contact with the rising flue gas during the flow of water in the heating pipes 6, thereby achieving the effect of heat exchange. The heating chamber 7 connected to the bottom end of the heating pipe 6 is set as a hemispherical hollow structure, and the heating chamber 7 is located at the upper end of the connecting pipe 2, so that the high-heat flue gas entering the upper end of the connecting pipe 2 directly heats the body of the heating chamber 7, thereby achieving the effect of rapidly heating the internal temperature of the heating chamber 7.

[0032] refer to Figure 5 and Figure 6 During the heating process, after cold water enters the interior of the heating hood 3, due to the blocking effect of the heat insulation sheet 5, the cold water poured into the heating hood 3 by the cold water pipe 4 will form a meandering flow inside the heating hood 3. The water inside the heating hood 3 will directly contact the periphery of the flue gas for heat exchange. The heat insulation sheet 5 on the outside of the heating hood 3 achieves the function of blocking and heat preservation. Subsequently, the spiral structure of the heating pipe 6 can form a vortex in the water flow poured into the heating chamber 7, increasing the water flow time inside the heating chamber 7 and achieving the effect of retention. Since the bottom of the heating chamber 7 is directly above the connecting pipe 2, the water in the heating chamber 7 can fully contact the newly entered rising flue gas during the retention process, achieving a full heating process.

[0033] refer to Figure 4 and Figure 8 In a specific implementation of this invention, a plurality of cleaning rods 14 are slidably connected to the top of the top cover 12, and the cleaning rods 14 are located at the top of the honeycomb holes inside the heat exchange cylinder 9. The cross-sectional diameter of the cleaning rods 14 is equal to the cross-sectional diameter of the honeycomb holes inside the heat exchange cylinder 9. A straight rod 15 is fixedly connected to the top of the cleaning rods 14 by a bracket, and a handle is provided on the side of the straight rod 15 for easy gripping and pressing of the straight rod 15, causing the cleaning rods 14 and the straight rod 15 to move down together. A pressure cover 16 is slidably connected to the outside of the straight rod 15, and the side of the pressure cover 16 is connected to the side of the outer shell 11. The straight rod 15 is fixedly connected to the pressure cover 16. The contact part between the straight rod 15 and the pressure cover 16 can be designed to be airtight. A piston 17 is fixedly connected to the side of the straight rod 15 and slides inside the pressure cover 16. A telescopic spring 18 is provided in the gap between the pressure cover 16 and the piston 17. An air pipe 19 is connected through the bottom end of the pressure cover 16, and a cleaning ring 20 is fixedly connected to the end of the air pipe 19 away from the pressure cover 16. A ventilation hole is opened on the inner side of the cleaning ring 20. The upper set of cleaning rings 20 is designed at the bottom end of the heat exchange cylinder 9, and the lower set of cleaning rings 20 is designed on the periphery of the heating chamber 7.

[0034] refer to Figure 4 and Figure 8 When personnel periodically clean the dust inside the device, they hold the side handle of the straight rod 15 and move the cleaning rod 14 and the straight rod 15 downwards together. During the downward movement of the top cover 12, it can be aligned and inserted into the honeycomb holes inside the heat exchange cylinder 9 to clean the honeycomb holes. At the same time, the downward movement of the straight rod 15 moves the piston 17 inside the pressure shroud 16 downwards together. At this time, the internal pressure of the pressure shroud 16 increases due to the downward movement of the piston 17, and airflow is discharged from the end of the air pipe 19. The air pipe 19 and the cleaning ring 20 are designed as two sets. The upper set of cleaning rings 20 is designed to blow air to clean the bottom of the heat exchange cylinder 9, and the lower set of cleaning rings 20 is designed to clean the bottom of the heating chamber 7, realizing a rapid dust cleaning process. The operation process is simple and fast.

[0035] In a specific implementation of this utility model, the air pipe 19 is configured as two sets, and the cleaning rings 20 connected to the ends of the two sets of air pipes 19 are respectively located at the upper and lower ends of the inner side of the heating cover 3. The upper end of the inner side of the heating cover 3 is respectively located at the bottom of the heat exchange cylinder 9 and the periphery of the heating chamber 7, ensuring that the cleaning rings 20 can make corresponding contact during the process of exhausting gas, thereby achieving the cleaning process.

[0036] In a specific implementation of this utility model, a cleaning mechanism 21 is fitted onto the outside of the heating tube 6. A second telescopic spring 22 is provided on the side of the cleaning mechanism 21. A ring plate 23 is fixedly connected to the end of the second telescopic spring 22 away from the heating tube 6. The side of the ring plate 23 is fixedly connected to the side of the straight rod 15 through a bracket. A protective cover 24 is fitted onto the connection part between the straight rod 15 and the second telescopic spring 22. The side of the protective cover 24 is fixedly connected to the side of the heating cover 3. When the bottom end of the straight rod 15 moves down, it drives the connected second telescopic spring 22 to move down. The second telescopic spring 22 achieves the cleaning process as it slides on the inner surface of the heating cover 3, ensuring that the inner surface of the heating cover 3 is cleaned without direct contact.

[0037] refer to Figure 4 and Figure 6 During the cleaning process, because the extension spring 22 is directly connected to the end of the straight rod 15 during its downward movement, the extension spring 22 does not have a self-rotation process inside the heating cover 3. Furthermore, when the cleaning mechanism 21 is fitted onto the outside of the heating tube 6, the extension spring 22 will be stretched due to the spiral structure. When the ring plate 23 is reset, the tension of the extension spring 22 and the elasticity of the extension spring 18 ensure that the extension spring 22 automatically moves upward after moving down to the lowest point, thus achieving the process of cleaning the inner wall of the heating cover 3 again.

[0038] refer to Figure 8To ensure that the connection between the telescopic spring 22 and the straight rod 15 is maintained during the up-and-down movement of the heating cover 3, a channel for the up-and-down movement is provided inside the heating cover 3, and the outside of the channel is covered by a protective cover 24 to prevent smoke from being discharged from the channel of the heating cover 3. The protective cover 24 is made of heat-resistant rubber.

[0039] In a specific implementation of this utility model, the cleaning mechanism 21 includes a sleeve 2101. The inner wall of the sleeve 2101 is slidably connected to the outer side of the heating tube 6. Several sets of rollers 2102 are rotatably connected inside the sleeve 2101, and several sets of brushes 2103 are fixedly connected to the inner side of the sleeve 2101. When the sleeve 2101 moves down together with the ring plate 23 and the second telescopic spring 22, the design of the rollers 2102 makes the sliding of the sleeve 2101 on the outer side of the heating tube 6 smoother. At the same time, the designed brushes 2103 can further clean the surface of the heating tube 6.

[0040] In a specific implementation of this utility model, the top of the top cover 12 is configured as a detachable structure, and the bottom of the top cover 12 covers the upper end of the heat exchange cylinder 9. When the rising flue gas passes through the heat exchange cylinder 9 for heat exchange, a small amount of impurities in the flue gas will adhere to the top of the top cover 12. Personnel can disassemble the top cover 12 to achieve the cleaning effect on the inner wall of the top cover 12.

[0041] The working principle of this utility model is as follows: When the device is running, the high-temperature flue gas from the boiler will be injected into the interior of the base 1 through the connecting pipe 2 and rise. Simultaneously, the cold water pipe 4 will inject cold water into the interior of the heating hood 3. Subsequently, the meandering water flow inside the heating hood 3 will come into contact with the rising flue gas inside the heating hood 3, achieving the function of primary heat exchange. Then, the heating hood 3 will inject water into the interior of the heating chamber 7 through the heating pipe 6. Because the heating pipe 6 is set with a spiral structure and is located inside the heating hood 3, the outer side of the heating pipe 6 can fully contact the rising flue gas to achieve the purpose of further heating. Then, the heating pipe 6 will collect the water into the interior of the heating chamber 7. Because the heating chamber 7 is located at the top of the connecting pipe 2, it achieves the purpose of reheating. Then, the hot water will enter the interior of the heat exchange cylinder 9 through the straight pipe 8 by water pressure. The flue gas flowing inside the heating hood 3 will finally rise and flow through the honeycomb holes inside the heat exchange cylinder 9, achieving the final waste heat recovery of the water inside the heat exchange cylinder 9, realizing the function of multiple waste heat recovery, and maximizing the recovery of flue gas waste heat. Finally, the heat exchange cylinder 9 will discharge the heat-exchanged hot water through the hot water pipe 10.

[0042] When personnel periodically clean the dust inside the device, they hold the side handle of the straight rod 15 and move the cleaning rod 14 and the straight rod 15 downwards together. During the downward movement of the top cover 12, it can be aligned and inserted into the honeycomb holes inside the heat exchange cylinder 9 to clean the honeycomb holes. At the same time, the downward movement of the straight rod 15 moves the piston 17 inside the pressure shroud 16 downwards together. At this time, the internal pressure of the pressure shroud 16 increases due to the downward movement of the piston 17, and airflow is discharged from the end of the air pipe 19. The air pipe 19 and the cleaning ring 20 are designed as two sets. The upper set of cleaning rings 20 is designed to blow air to clean the bottom of the heat exchange cylinder 9, and the lower set of cleaning rings 20 is designed to clean the bottom of the heating chamber 7, realizing a rapid dust removal process.

[0043] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A boiler waste heat recovery device, comprising a base (1), wherein the central axis of the base (1) is vertically arranged, characterized in that: A connecting pipe (2) for smoke inlet is connected through the center of the bottom end of the base (1). A heating cover (3) is fixedly connected to the top of the base (1). The interior of the heating cover (3) adopts a hollow structure. A heating pipe (6) is fixedly connected to the inner wall of the heating cover (3), and the heating pipe (6) communicates with the interior of the heating cover (3). A heating chamber (7) is fixedly connected to the bottom end of the heating pipe (6). A straight pipe (8) is connected through the top of the heating chamber (7). A heat exchange cylinder (9) is fixedly connected to the top of the straight pipe (8). An outer shell (11) is fitted onto the outside of the heat exchange cylinder (9), and the bottom end of the outer shell (11) is fixedly connected to the top of the heating cover (3). A top cover (12) is fixedly connected to the top of the outer shell (11). A smoke outlet pipe (13) for smoke exhaust is provided on the side of the top cover (12).

2. The boiler waste heat recovery device according to claim 1, characterized in that: The heating cover (3) is provided with a cold water pipe (4) for water inlet on the side, and the heat exchange cylinder (9) is provided with a hot water pipe (10) for water outlet on the side. The heat exchange cylinder (9) has a honeycomb structure in its outer shape and a hollow structure inside. The bottom end of the heat exchange cylinder (9) is connected to the top of the straight pipe (8).

3. The boiler waste heat recovery device according to claim 2, characterized in that: The cold water pipe (4) is located at the upper end of the heating cover (3). The inner wall of the heating cover (3) is provided with a heat insulation sheet (5), and the top of the heat insulation sheet (5) is fixedly connected to the top of the inner wall of the heating cover (3). There are four sets of heating pipes (6). All four sets of heating pipes (6) are designed to be spirally gathered inward. The heating chamber (7) connected to the bottom end of the heating pipe (6) is set as a hemispherical hollow structure, and the heating chamber (7) is located at the top of the connecting pipe (2).

4. The boiler waste heat recovery device according to claim 1, characterized in that: The top of the top cover (12) is slidably connected to several sets of cleaning rods (14). The top of the cleaning rods (14) is fixedly connected to a straight rod (15) by a bracket. The outside of the straight rod (15) is slidably connected to a pressure cover (16), and the side of the pressure cover (16) is fixedly connected to the side of the outer shell (11). The side of the straight rod (15) is fixedly connected to a piston (17), and the piston (17) slides inside the inner wall of the pressure cover (16). A telescopic spring (18) is provided in the gap between the pressure cover (16) and the piston (17). An air pipe (19) is connected through the bottom end of the pressure cover (16), and a cleaning ring (20) is fixedly connected to the end of the air pipe (19) away from the pressure cover (16).

5. The boiler waste heat recovery device according to claim 4, characterized in that: The air pipe (19) is configured in two sets, and the cleaning rings (20) connected to the ends of the two sets of air pipes (19) are respectively located at the upper and lower ends inside the heating cover (3).

6. The boiler waste heat recovery device according to claim 4, characterized in that: A cleaning mechanism (21) is fitted around the heating tube (6). A second telescopic spring (22) is provided on the side of the cleaning mechanism (21). A ring plate (23) is fixedly connected to the end of the second telescopic spring (22) away from the heating tube (6). The side of the ring plate (23) is fixedly connected to the side of the straight rod (15) through a bracket. A protective cover (24) is fitted around the connection between the straight rod (15) and the second telescopic spring (22). The side of the protective cover (24) is fixedly connected to the side of the heating cover (3).

7. The boiler waste heat recovery device according to claim 6, characterized in that: The cleaning mechanism (21) includes a sleeve (2101), the inner wall of which is slidably connected to the outer side of the heating tube (6), a number of rollers (2102) are rotatably connected inside the sleeve (2101), and a number of brushes (2103) are fixedly connected to the inner side of the sleeve (2101).

8. The boiler waste heat recovery device according to claim 1, characterized in that: The top of the top cover (12) is configured as a detachable structure, and the bottom of the top cover (12) covers the upper end of the heat exchange cylinder (9).

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