Industrial boiler flue gas waste heat recycling device

Abstract

The utility model relates to the technical field of industrial boilers, in particular to an industrial boiler flue gas waste heat recycling device which comprises a recycling tank body, a water inlet pipe is fixedly connected to the middle side of the top of the recycling tank body, a dust collecting hopper is arranged at the bottom of the recycling tank body, and five connecting pipes are annularly and fixedly connected to the outer wall of the bottom end of the water inlet pipe at equal intervals. A transmission assembly is arranged on the top side of the recycling tank body, a rotating assembly is arranged on the middle side in the recycling tank body, and circulating water pipelines are arranged on the upper side and the lower side of the rotating assembly. According to the device, the annular supporting plate, the annular rack, the bearing block, the movable connecting block, the scraping pad, the rotating assembly and the transmission assembly are matched, so that the outer wall of the water storage pipe can be automatically dedusted, manual cleaning is not needed, and the situation that dust particles in smoke entering the recycling tank body are adhered and accumulated on the surface of the water storage pipe after long-term use is avoided; therefore, the heating efficiency of the internal water is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial boilers, in particular to a device for recovering and utilizing waste heat from flue gas of an industrial boiler. Background Art

[0002] There are two types of industrial boiler products. One is steam, which is used for power generation or gas supply. For example, fertilizer plants can use steam vaporization to synthesize fertilizers with coal as raw material. This is a typical industrial boiler. Most industrial boilers are still coal-fired, and gas-fired ones are generally waste heat boilers used to recover waste heat. The most common industrial boiler is the circulating fluidized bed boiler. Industrial boilers are important thermal power equipment. my country is the country with the largest production and use of boilers in the world today. For a long time in the future, coal-fired industrial boilers will still be the leading product in my country.

[0003] During the use of industrial boilers, the flue gas generated contains a large amount of heat energy. Usually, a special boiler flue gas waste heat recovery device is used to further reuse the generated flue gas heat energy. It can generally be used to connect water pipes in the recovery device, and use the heat energy contained in the flue gas to heat the water in the water pipe, so that the heated water can be used in daily life, so that the heat energy in the flue gas can be effectively reused. However, after long-term flue gas heating use in the recovery device, a large amount of dust is easily adhered and accumulated on the outer wall of the water pipe, which may reduce the heating efficiency in the later stage. There are many pipes and they are located inside the device, and it is impossible to clean the pipe wall manually. Therefore, in response to the above problems, we provide a new industrial boiler flue gas waste heat recovery device. Utility Model Content

[0004] The purpose of the utility model is to provide an industrial boiler flue gas waste heat recovery device to solve the problem that a large amount of dust is easily adhered and accumulated on the outer wall of a water pipe after long-term flue gas heating in a recovery device, which may reduce the subsequent heating efficiency and make manual cleaning more troublesome.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An industrial boiler flue gas waste heat recovery and utilization device comprises a recovery tank body, a water inlet pipe is fixedly connected to the top middle side of the recovery tank body, an ash collecting hopper is arranged at the bottom of the recovery tank body, five connecting pipes are fixedly connected to the outer wall of the bottom end of the water inlet pipe in an annular manner at equal intervals, a transmission assembly is arranged on the top side of the recovery tank body, a rotating assembly is arranged on the inner middle side of the recovery tank body, and an annular water pipe is arranged on the upper and lower sides of the rotating assembly, one end of the five connecting pipes away from the water inlet pipe is fixedly connected to the inner side surface of the annular water pipe on the upper side, and the inner wall of the recovery tank body is provided with a transmission assembly. The side is rotatably connected to an annular support plate, the inner side surface of the annular support plate is fixedly connected to an annular rack, the bottom surface of the annular support plate is fixedly connected to a receiving block, the inward side of the receiving block is slidably connected to a movable block, the outer wall of the movable block away from the receiving block is fixedly connected to a scraper pad, a drain pipe is fixedly connected to the lower part of the rear outer wall of the recovery tank body, one end of the drain pipe is fixedly connected to the outer wall of the ring water pipe on the lower side, a smoking pipe is fixedly connected to the lower part of the front outer wall of the recovery tank body, and a smoke exhaust pipe is fixedly connected to the upper part of the rear outer wall of the recovery tank body.

[0007] Furthermore, a plurality of springs are arranged inside the receiving block, one end of each spring is connected to the outer wall of the movable receiving block, and the other end of each spring is connected to the inner wall of the receiving block.

[0008] Furthermore, the transmission assembly includes five rotating parts, the top of the rotating parts is rotatably connected to the inner top side surface of the recovery tank body, the bottom ends of the rotating parts are fixedly connected to spur gears, the five spur gears are meshed with the annular rack for transmission, an L-shaped bracket is fixedly connected to one side of the top of the recovery tank body, one end of the L-shaped bracket is fixedly connected to a motor, and the driving end of the motor is fixedly connected to the top of one of the rotating parts through a connecting part.

[0009] Furthermore, the rotating assembly includes a water storage pipe, both ends of the water storage pipe are fixedly connected with connecting ring frames, the two connecting ring frames are respectively rotatably connected to the opposite sides of the two ring water pipes, the top surface of the upper connecting ring frame is annularly fixedly connected with a plurality of coupling rods, the top end of the coupling rod is fixedly connected with a connecting rotating column, the lower part of the outer wall of the connecting rotating column is rotatably connected to the inner top side surface of the upper ring water pipe, the top end of the connecting rotating column is fixedly connected to the middle side of the bottom surface of the spur gear, the scraper pad contacts the adjacent water storage pipe, the lower side of the inner wall of the recovery tank body 1 is fixedly connected with a fixing block 13, one end of the fixing block 13 is fixedly connected to the outer wall of the ring water pipe 9.

[0010] Furthermore, a valve is installed on the outer wall of the drain pipe, a pump body is installed on the outer wall of the water inlet pipe, the bottom end of the pump body is fixedly connected to the top of the recovery tank body, the end of the smoke exhaust pipe away from the recovery tank body is fixedly connected to a suction fan, and the upper end of the suction fan is fixedly connected to a smoke exhaust hopper.

[0011] Furthermore, the top surface of the ash hopper is slidably inserted into the bottom inner side surface of the recovery tank body, and mounting plates are fixedly connected on both sides of the upper outer wall of the ash hopper and both sides of the lower outer wall of the recovery tank body, and two mounting holes are provided inside the mounting plates, and a fixed ring frame is fixedly connected to the middle part of the outer wall of the recovery tank body, and four supporting legs are fixedly connected to the outer wall of the fixed ring frame in an equidistant manner in a ring.

[0012] Furthermore, a sealing cover is sleeved on the bottom of the ash collecting hopper, and a long screw is screwed and connected between the ash collecting hopper and the interior of the sealing cover.

[0013] The utility model has the following beneficial effects:

[0014] In the utility model, through the coordinated arrangement of the recovery tank body, the water inlet pipe, the connecting pipe, the drain pipe, the smoking pipe and the smoke exhaust pipe, the waste heat of the boiler flue gas can be recycled and utilized, thereby ensuring the reuse of resources. By utilizing the coordination of the annular support plate, the annular rack, the receiving block, the movable connection block, the scraper pad, the rotating assembly and the transmission assembly, the outer wall of the water storage pipe can be automatically cleaned without manual cleaning, thereby avoiding the phenomenon that after long-term use, the dust particles in the flue gas entering the recovery tank body adhere to and accumulate on the surface of the water storage pipe, thereby reducing the heating efficiency of the internal water. Through the coordinated arrangement of the annular support plate, the annular rack and the rotating assembly, the receiving block drives the scraper pad to revolve through the movable connection block, and the water storage pipe can also rotate on its own, so that the dust accumulation on the surface of the water storage pipe is cleaned more comprehensively, thereby further improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 This is a three-dimensional diagram of an industrial boiler flue gas waste heat recovery and utilization device proposed by the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of a recovery tank body of an industrial boiler flue gas waste heat recovery and utilization device proposed by the utility model;

[0018] Figure 3 It is a schematic diagram of the position of the spur gears of an industrial boiler flue gas waste heat recovery and utilization device proposed by the utility model;

[0019] Figure 4 It is a cross-sectional schematic diagram of a water-circulating pipeline of an industrial boiler flue gas waste heat recovery and utilization device proposed by the utility model;

[0020] Figure 5 The utility model is a schematic diagram of the position of a coupling rod of an industrial boiler flue gas waste heat recovery and utilization device.

[0021] Legend:

[0022] 1. Recovery tank; 2. Water inlet pipe; 3. Transmission assembly; 31. Rotating part; 32. Spur gear; 33. Motor; 34. L-shaped bracket; 4. Connecting pipe; 5. Annular support plate; 51. Annular rack; 6. Acceptor block; 61. Spring; 7. Movable joint block; 71. Scraper pad; 8. Rotating assembly; 81. Water storage pipe; 82. Connecting rotating column; 83. Engaging rod; 84. Connecting ring frame; 9. Drain pipe; 10. Smoke pipe; 11. Smoke exhaust pipe; 12. Circular water pipe; 13. Fixed block; 14. Ash hopper; 15. Closing cover; 16. Pump body; 17. Suction fan; 18. Smoke exhaust pipe; 19. Mounting plate; 20. Fixed ring frame; 21. Support leg; 22. Valve; 23. Long screw. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Reference Figure 1-5 As shown, an embodiment of the utility model is provided: an industrial boiler flue gas waste heat recovery and utilization device, comprising a recovery tank body 1, a water inlet pipe 2 is fixedly connected to the top middle side of the recovery tank body 1, a dust collecting hopper 14 is arranged at the bottom of the recovery tank body 1, five connecting pipes 4 are fixedly connected to the outer wall of the bottom end of the water inlet pipe 2 in an annular manner at equal intervals, a transmission component 3 is arranged on the top side of the recovery tank body 1, a rotating component 8 is arranged on the inner middle side of the recovery tank body 1, and a ring water pipeline 12 is arranged on the upper and lower sides of the rotating component 8, one end of the five connecting pipes 4 away from the water inlet pipe 2 is fixedly connected to the inner side surface of the upper ring water pipeline 12, and an annular support plate 5 is rotatably connected to the upper side of the inner wall of the recovery tank body 1, and the inner side of the annular support plate 5 The surface is fixedly connected with an annular rack 51, the bottom surface of the annular support plate 5 is fixedly connected with a receiving block 6, a plurality of springs 61 are arranged inside the receiving block 6, one end of the spring 61 is connected to the outer wall of the movable connecting block 7, the other end of the spring 61 is connected to the inner wall of the receiving block 6, the inner side of the receiving block 6 is slidably connected with the movable connecting block 7, the outer wall of the movable connecting block 7 away from the receiving block 6 is fixedly connected with a scraper pad 71, a drain pipe 9 is fixedly connected to the lower part of the rear outer wall of the recovery tank body 1, one end of the drain pipe 9 is fixedly connected to the outer wall of the lower side ring water pipe 12, a smoking pipe 10 is fixedly connected to the lower part of the front outer wall of the recovery tank body 1, and a smoke exhaust pipe 11 is fixedly connected to the upper part of the rear outer wall of the recovery tank body 1.

[0025] Specifically, the water inlet pipe 2 is used to connect to an external cold water tank, the ash hopper 14 is used to catch the scraped ash, the five connecting pipes 4 are used to transport the water in the water inlet pipe 2, the transmission assembly 3 is used to drive the receiving block 6, so that the receiving block 6 can drive the movable joint 7 and the scraper pad 71 to rotate, the ring water pipe 12 is used to connect the rotating assembly 8, the smoke pipe 10 is used to inhale the smoke generated by the boiler, and the smoke exhaust pipe 11 is used to exhaust the used smoke, and the spring 61 is set to make the scraper pad 71 on the movable joint 7 close to the rotating assembly 8.

[0026] A valve 22 is installed on the outer wall of the drain pipe 9, a pump body 16 is installed on the outer wall of the water inlet pipe 2, the bottom end of the pump body 16 is fixedly connected to the top of the recovery tank body 1, and the end of the smoke exhaust pipe 11 away from the recovery tank body 1 is fixedly connected to a suction fan 17, and the upper end of the suction fan 17 is fixedly connected to a smoke exhaust hopper 18.

[0027] Specifically, the valve 22 and the drain pipe 9 are used to control the outflow of water, the pump body 16 is used to draw water in the cold water tank into the water inlet pipe 2, and the suction fan 17 is set to suck out the used smoke in the recovery tank 1.

[0028] The top surface of the ash hopper 14 is slidably inserted into the bottom inner side of the recovery tank body 1, and mounting plates 19 are fixedly connected to the upper sides of the outer wall of the ash hopper 14 and the lower sides of the outer wall of the recovery tank body 1. Two mounting holes are provided inside the mounting plates 19. A fixed ring frame 20 is fixedly connected to the middle of the outer wall of the recovery tank body 1, and four supporting legs 21 are fixedly connected to the outer wall of the fixed ring frame 20 in an equidistant manner. A closing cover 15 is sleeved on the bottom of the ash hopper 14, and a long screw 23 is screwed into the interior of the ash hopper 14 and the closing cover 15.

[0029] Specifically, the scraped dust can be rolled up by the ash hopper 14, and the ash can be emptied later by removing the long screw 23 on the closing cover 15. The ash hopper 14 can be further disassembled through the mounting plate 19, so that it is convenient for the staff to check the inside of the recovery tank body 1, and it is also convenient to clean the ash hopper 14 after long-term use. The operation is relatively simple. The recovery tank body 1 is supported and fixed as a whole by the setting of the fixed ring frame 20 supporting legs 21.

[0030] The transmission assembly 3 includes five rotating members 31, the top of the rotating member 31 is rotatably connected to the inner top side surface of the recovery tank body 1, the bottom end of the rotating member 31 is fixedly connected to a spur gear 32, and the five spur gears 32 are all meshed with the annular rack 51. An L-shaped bracket 34 is fixedly connected to one side of the top of the recovery tank body 1, and one end of the L-shaped bracket 34 is fixedly connected to a motor 33. The driving end of the motor 33 is fixedly connected to the top of one of the rotating members 31 through a connecting member.

[0031] Specifically, the motor 33 is used to drive one of the rotating members 31 to rotate through the connecting member, so that the spur gear 32 connected to the rotating member 31 rotates, and the rotation of the spur gear 32 cooperates with the setting of the annular rack 51 to drive the annular support plate 5 to rotate, so that the annular support plate 5 drives the receiving block 6, the movable joint block 7 and the scraper pad 71 provided at the bottom to revolve around the annular water pipe 12, and the rotation of the annular support plate 5 causes the other four spur gears 32 meshing with the annular rack 51 to rotate.

[0032] The rotating assembly 8 includes a water storage pipe 81, both ends of which are fixedly connected with connecting ring frames 84, and the two connecting ring frames 84 are respectively rotatably connected to the opposite sides of the two ring water pipes 12, and the top surface of the upper connecting ring frame 84 is annularly fixedly connected with a plurality of coupling rods 83, and the top end of the coupling rod 83 is fixedly connected with a connecting rotating column 82, and the lower part of the outer wall of the connecting rotating column 82 is rotatably connected to the inner top side surface of the upper ring water pipe 12, and the top end of the connecting rotating column 82 is fixedly connected to the middle side of the bottom surface of the spur gear 32, and the scraper pad 71 contacts the adjacent water storage pipe 81, and a fixed block 13 is fixedly connected to one side of the lower inner wall of the recovery tank body 1, and one end of the fixed block 13 is fixedly connected to the outer wall of the ring water pipe 12.

[0033] Specifically, by utilizing the rotation of the five spur gears 32, the connecting rotating column 82 connected to the spur gear 32 drives the water storage pipe 81 to rotate by means of the engagement rod 83 and the cooperation with the upper connecting ring frame 84. The revolution of the scraper pad 71 and the cooperation with the rotation of the water storage pipe 81 can achieve comprehensive scraping of the dust accumulated on the surface of the water storage pipe 81, thereby ensuring a better cleaning effect. The ratio of the diameter of the circular trajectory of the scraper pad 71 during rotation to the annular support plate 5 is greater than the ratio of the diameter of the water storage pipe 81 to the spur gear 32. The diameter of the water storage pipe 81 is relatively smaller than the diameter of the spur gear 32. The circular rotation trajectory of the scraper pad 71 is not much different from the diameter of the annular support plate 5. Therefore, when the spur gear 32 rotates while shifting the annular rack 51 in the annular support plate 5, the scraper pad 71 can be quickly displaced relative to the surface of the water storage pipe 81, so that the scraper pad 71 can clean the surface of the water storage pipe 81.

[0034] Working principle: When in use, the pump body 16 and the water inlet pipe 2 are used to cooperate with each other, and the water in the water tank enters the water ring pipe 12 and the water storage pipe 81 through the connecting pipe 4, and then the smoke generated by the boiler is sucked into the recovery tank 1 through the smoking pipe 10, and then the heat energy contained in the smoke is used to heat the water in the water storage pipe 81. The heated water then flows into the hot water tank through the cooperation of the drain pipe 9 and the valve 22. In use, by starting the motor 33, the driving end of the motor 33 drives the water connected through the connecting piece The rotating member 31 is used to drive a spur gear 32 at the bottom thereof to rotate. The rotation of the spur gear 32 cooperates with the setting of the annular rack 51 on the annular support plate 5, so that when the annular support plate 5 rotates, the annular rack 51 drives the other four spur gears 32 to rotate. The rotation of the annular support plate 5 drives the scraper pad 71 on the movable joint block 7 in the receiving block 6 connected at the bottom to revolve around the five water storage pipes 81. While the scraper pad 71 revolves, the scraper pad 71 is rotated by the spur gear 32. The connecting rotating column 82 connected to the gear 32 drives the water storage pipe 81 at the bottom of the coupling rod 83 to rotate, so that the scraper pad 71 can clean up one-third of the dust on the surface of the water storage pipe 81 when it rotates one circle, and the scraper pad 71 can clean up the dust on the other one-third of the surface of the water storage pipe 81 when it rotates one circle again. Therefore, after the scraper pad 71 rotates three circles, it can be used in conjunction with the rotation of the water storage pipe 81 to completely scrape off the dust on the surface of the water storage pipe 81. The ratio of the diameter of the circular trajectory of the scraper pad 71 when it rotates to the annular support plate 5 is greater than that of the water storage pipe 81 and the positive The diameter of the gear 32 is relatively smaller than that of the water pipe 81, and the diameter of the spur gear 32 is relatively smaller. The circular rotation trajectory of the scraper pad 71 is not much different from the diameter of the annular support plate 5. Therefore, when the spur gear 32 rotates while shifting the annular rack 51 in the annular support plate 5, the scraper pad 71 can be quickly displaced relative to the surface of the water pipe 81, so that the scraper pad 71 can scrape the surface of the water pipe 81, and the scraped ash falls into the ash hopper 14. Later, the closing cover 15 is removed by the long screw 23 to discharge the ash in the ash hopper 14.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above contents are merely examples and explanations of the present utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. An industrial boiler flue gas waste heat recovery and utilization device, comprising a recovery tank (1), It is characterized in that A water inlet pipe (2) is fixedly connected to the middle side of the top of the recovery tank body (1), a dust collecting hopper (14) is arranged at the bottom of the recovery tank body (1), five connecting pipes (4) are equidistantly and annularly fixedly connected to the outer wall of the bottom end of the water inlet pipe (2), a transmission assembly (3) is arranged on the top side of the recovery tank body (1), a rotating assembly (8) is arranged on the middle side of the interior of the recovery tank body (1), and a water ring pipe (12) is arranged on the upper and lower sides of the rotating assembly (8), one end of the five connecting pipes (4) away from the water inlet pipe (2) is fixedly connected to the inner side surface of the water ring pipe (12) on the upper side, an annular support plate (5) is rotatably connected to the upper side of the inner wall of the recovery tank body (1), and the The inner side surface of the annular support plate (5) is fixedly connected to an annular rack (51), the bottom surface of the annular support plate (5) is fixedly connected to a receiving block (6), the inner side of the receiving block (6) is slidably connected to a movable receiving block (7), the outer wall of the movable receiving block (7) away from the receiving block (6) is fixedly connected to a scraper pad (71), the lower part of the rear outer wall of the recovery tank body (1) is fixedly connected to a drain pipe (9), one end of the drain pipe (9) is fixedly connected to the outer wall of the lower ring water pipe (12), the lower part of the front outer wall of the recovery tank body (1) is fixedly connected to a smoking pipe (10), and the upper part of the rear outer wall of the recovery tank body (1) is fixedly connected to a smoke exhaust pipe (11).

2. The industrial boiler flue gas waste heat recovery and utilization device according to claim 1, It is characterized in that A plurality of springs (61) are arranged inside the receiving block (6), one end of the spring (61) is connected to the outer wall of the movable receiving block (7), and the other end of the spring (61) is connected to the inner wall of the receiving block (6).

3. The industrial boiler flue gas waste heat recovery and utilization device according to claim 1, It is characterized in that The transmission assembly (3) comprises five rotating members (31), the top of each rotating member (31) is rotatably connected to the inner top side surface of the recovery tank body (1), the bottom of each rotating member (31) is fixedly connected to a spur gear (32), and the five spur gears (32) are meshingly driven with the annular rack (51), an L-shaped bracket (34) is fixedly connected to one side of the top of the recovery tank body (1), one end of the L-shaped bracket (34) is fixedly connected to a motor (33), and the driving end of the motor (33) is fixedly connected to the top of one of the rotating members (31) via a connecting member.

4. The industrial boiler flue gas waste heat recovery and utilization device according to claim 3, It is characterized in that The rotating assembly (8) comprises a water storage pipe (81), both ends of which are fixedly connected to connecting ring frames (84), the two connecting ring frames (84) are respectively rotatably connected to the opposite sides of the two water ring pipes (12), the top surface of the upper connecting ring frame (84) is annularly fixedly connected to a plurality of engaging rods (83), the top end of the engaging rods (83) is fixedly connected to a connecting rotating column (82), the lower part of the outer wall of the connecting rotating column (82) is rotatably connected to the inner top side surface of the upper water ring pipe (12), the top end of the connecting rotating column (82) is fixedly connected to the middle side of the bottom surface of the spur gear (32), the scraper pad (71) contacts the adjacent water storage pipe (81), the lower side of the inner wall of the recovery tank body (1) is fixedly connected to a fixing block (13), one end of the fixing block (13) is fixedly connected to the outer wall of the water ring pipe (12).

5. The industrial boiler flue gas waste heat recovery and utilization device according to claim 1, It is characterized in that A valve (22) is installed on the outer wall of the drainage pipe (9), a pump body (16) is installed on the outer wall of the water inlet pipe (2), the bottom end of the pump body (16) is fixedly connected to the top of the recovery tank body (1), the end of the smoke exhaust pipe (11) away from the recovery tank body (1) is fixedly connected to a suction fan (17), and the upper end of the suction fan (17) is fixedly connected to a smoke exhaust hopper (18).

6. The industrial boiler flue gas waste heat recovery and utilization device according to claim 1, It is characterized in that The top surface of the ash hopper (14) is slidably inserted into the bottom inner side surface of the recovery tank body (1); the upper two sides of the outer wall of the ash hopper (14) and the lower two sides of the outer wall of the recovery tank body (1) are fixedly connected with mounting plates (19); two mounting holes are provided inside the mounting plates (19); a fixed ring frame (20) is fixedly connected to the middle of the outer wall of the recovery tank body (1); and four support legs (21) are fixedly connected to the outer wall of the fixed ring frame (20) in an annular manner and equidistantly.

7. The industrial boiler flue gas waste heat recovery and utilization device according to claim 6, It is characterized in that The bottom of the ash collecting hopper (14) is sleeved with a closing cover (15), and a long screw (23) is screwed and connected to the inside of the ash collecting hopper (14) and the closing cover (15).

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