Boiler flue gas waste heat recycling device

Abstract

The invention discloses a boiler flue gas waste heat recycling device, and particularly relates to the technical field of waste heat recovery, the boiler flue gas waste heat recycling device comprises an induced draft fan, one end of the induced draft fan is connected with a smoke guide pipe, one end of the smoke guide pipe is connected with the top of a boiler body, the other end of the induced draft fan is connected with a transmission pipe, and the bottom end of the transmission pipe is vertically welded with a smoke transmission pipe; the induced draft fan is used for conveying flue gas and changing the flue gas conveying speed; the transmission unit is mounted at one end of the transmission pipe, and the transmission unit is used for converting flue gas power at different speeds into mechanical power; one side of the waste heat recovery box is connected with the smoke conveying pipe, and a heat conduction box used for containing a coal mine is installed in the waste heat recovery box; the stirring assembly is rotationally mounted on the waste heat recovery box; one end of the cleaning assembly is connected and matched with the movable end plate, and the other end of the cleaning assembly is arranged at the bottom of the heat conduction box; and the plugging assembly is mounted in the slag collecting box. The flue gas waste heat recovery system has the advantage that the flue gas waste heat recovery efficiency and the recovery utilization rate can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and more specifically, to a boiler flue gas waste heat recovery and utilization device. 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.

[0003] When the boiler is in use, the flue gas contains a large amount of heat. The existing waste heat recovery device still has a low heat recovery rate for the flue gas, and in the process of heat recovery, a large amount of electricity is still required to ensure the operation of the device, resulting in increased energy consumption.

[0004] Therefore, a boiler flue gas waste heat recovery and utilization device is proposed. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a boiler flue gas waste heat recovery and utilization device to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a boiler flue gas waste heat recovery and utilization device, comprising: An induced draft fan, one end of which is connected to a smoke guide pipe, one end of which is connected to the top of the furnace body, and the other end of which is connected to a transmission pipe, a smoke conveying pipe is vertically welded to the bottom of the transmission pipe, and the induced draft fan is used to convey smoke and change the smoke conveying speed; A transmission unit, the transmission unit is installed at one end of the transmission pipe, the transmission unit is used to convert the flue gas power of different speeds into mechanical power, the transmission unit includes a fixed cover, a damper, a fixed end plate, a fixed rod, a connecting rod, a stopper, a spring and a movable end plate, the fixed cover is screwed and fixed to the end of the transmission pipe, a damper is arranged on one side of the fixed cover, a fixed end plate is installed on the fixed end of the damper, a connecting rod is coaxially arranged on the movable end of the damper, one end of the connecting rod is connected to a stopper slidably connected to the transmission pipe, a spring is sleeved on the connecting rod between the stopper and the fixed cover, a movable end plate is arranged on the movable end of the damper, a fixed end plate is arranged on the fixed end of the damper, two fixed rods are installed on the fixed cover, and the two fixed rods are connected to the fixed end plate together; A waste heat recovery box, one side of which is connected to the smoke conveying pipe, a heat conduction box for holding coal is installed in the waste heat recovery box, one side of which is provided with a box door, a filter box is provided at the top of the waste heat recovery box, an exhaust pipe is provided at the top of the filter box, and a slag collecting box is provided at the bottom of the waste heat recovery box; A stirring assembly, wherein the stirring assembly is rotatably mounted on the waste heat recovery box, one end of the stirring assembly extends into the heat conduction box, and the other end of the stirring assembly is connected and matched with the movable end plate. The stirring assembly is used to stir the coal in the heat conduction box to improve the uniformity of the coal recovery of flue gas waste heat; A cleaning component, one end of which is connected to the movable end plate, and the other end of which is arranged at the bottom of the heat conduction box. The cleaning component is used to clean the smoke and dust on the outer surface of the heat conduction box to improve the efficiency of flue gas waste heat recovery; A plugging component is installed in the slag collecting box, and is used to prevent the flue gas entering the waste heat recovery box from overflowing, thereby improving the flue gas waste heat recovery rate.

[0007] Preferably, a conical groove is arranged at the bottom end of the waste heat recovery box, a notch is arranged at the bottom of the conical groove, and a blocking component is installed at the bottom end of the notch.

[0008] Preferably, the slag collecting box has a slag leakage opening at the top, and receiving grooves are arranged on both sides of the top of the slag leakage opening, and a plugging component is installed in each of the receiving grooves, and a slag collecting groove is arranged at the bottom of the slag leakage opening.

[0009] Preferably, the blocking assembly comprises an electric push rod and a blocking plate, the electric push rod is installed on the outside of the slag collecting box, and the telescopic end of the electric push rod is connected to the blocking plate which is slidably connected to the receiving groove.

[0010] Preferably, both ends of the movable end plate are provided with mounting holes, and each mounting hole is respectively connected and matched with one end of the stirring component and the cleaning component.

[0011] Preferably, the stirring assembly includes a first sleeve, a first screw, a rotating rod and a stirring plate. The first sleeve is installed in a mounting hole opened at the top of the movable end plate. The first sleeve is connected and cooperated with the first screw. The end of the first screw is connected to a rotating rod rotatably connected to the waste heat recovery box. The stirring plate in the heat conduction box is installed on the rotating rod.

[0012] Preferably, the cleaning assembly includes a second sleeve, a second screw, a third screw, a third sleeve, a cleaning scraper, a guide block and a guide rod. The second sleeve is installed in a mounting hole opened at the bottom of the movable end plate. The second sleeve is fitted with a second screw. The end of the second screw is connected to a third screw rotatably connected to a waste heat recovery box. The third screw is sleeved with a third sleeve. The third sleeve is fixedly connected to a cleaning scraper slidably connected to the outer surface of the heat conduction box. Two guide blocks are symmetrically installed at the bottom end of the cleaning scraper, and each of the guide blocks is slidably connected to a guide rod connected to the inner wall of the waste heat recovery box.

[0013] Preferably, the pitch of the second screw is smaller than the pitch of the third screw.

[0014] A bracket is installed at the bottom end of the furnace body, and an induced draft fan is supported on the bracket on one side of the furnace body.

[0015] Technical effects and advantages of the present invention: 1. By sealing the notch at the bottom of the conical groove through the sealing component, the incoming flue gas can be prevented from overflowing from the bottom of the notch, thereby improving the flue gas waste heat recovery rate. At the same time, through the setting of the conical groove, the smoke can slide down conveniently. When the notch is opened by the sealing component, the accumulated smoke can be discharged easily, thereby improving the convenience of smoke waste residue recovery.

[0016] 2. By extending and retracting the electric push rod, the sealing plate can be dragged to move, so as to control the connection and closing of the slag leakage port and the slot. When the slag leakage port and the slot are closed, the smoke can be prevented from overflowing. When the slag leakage port and the slot are connected, it is convenient to clean the accumulated smoke and waste slag.

[0017] 3. By moving the movable end plate back and forth, the first sliding sleeve is pulled to move, so that the first screw drives the rotating rod to rotate synchronously, so that the stirring plate stirs the coal in the heat transfer box, so that the coal can evenly absorb the waste heat of the flue gas and improve the uniformity of waste heat recovery.

[0018] 4. By moving the movable end plate back and forth, the second sleeve is pulled to move, so that the second screw rotates synchronously with the third screw, and the pitch of the second screw is smaller than the pitch of the third screw, so that the distance of the third sleeve moving back and forth is greater than the distance of the second sleeve moving. When the third sleeve moves back and forth, the cleaning scraper can clean the smoke and dust attached to the outer surface of the heat transfer box under the guidance of the guide rod to avoid the adhesion of smoke and dust and reduce the thermal efficiency of the heat transfer box. By improving the thermal efficiency of the heat transfer box, the heat absorption efficiency of the coal mine in the heat transfer box is improved, thereby improving the efficiency of recovering the waste heat from the flue gas, and at the same time, improving the waste heat recovery rate of the flue gas.

[0019] 5. The induced draft power is changed through the circulation of the induced draft fan, the flue gas flow rate is changed, and the transmission unit is used to convert it to provide power for the stirring component and the cleaning component. No additional driving equipment is needed, thereby reducing the use of additional electric energy and reducing electricity costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal structure of the waste heat recovery box of the present invention.

[0022] Figure 3 It is a schematic diagram of the connection structure between the transmission unit, the stirring assembly and the cleaning assembly of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the transmission unit of the present invention.

[0024] Figure 5 It is a schematic diagram of the connection structure of the stirring assembly of the present invention.

[0025] Figure 6 It is a schematic diagram of the connection structure of the cleaning component of the present invention.

[0026] Figure 7 It is a schematic structural diagram of the blocking component of the present invention.

[0027] The reference numerals are: 1, bracket; 2, furnace body; 3, smoke guide pipe; 4, induced draft fan; 5, transmission pipe; 6, smoke delivery pipe; 7, transmission unit; 701, fixed cover; 702, damper; 703, fixed end plate; 704, fixed rod; 705, connecting rod; 706, stopper; 707, spring; 708, movable end plate; 8, stirring assembly; 801, first sliding sleeve; 802, first screw; 803, rotating rod; 804, stirring plate ; 9. Cleaning assembly; 901. Second sleeve; 902. Second screw; 903. Third screw; 904. Third sleeve; 905. Cleaning scraper; 906. Guide block; 907. Guide rod; 10. Waste heat recovery box; 11. Box door; 12. Filter box; 13. Exhaust pipe; 14. Slag collecting box; 15. Sealing assembly; 1501. Electric push rod; 1502. Sealing plate; 16. Heat transfer box; 17. Storage tank; 18. Slag collecting tank. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] As attached Figure 1-7 A boiler flue gas waste heat recovery and utilization device shown includes: An induced draft fan 4, one end of which is connected to a smoke guide pipe 3, one end of which is connected to the top of the furnace body 2, and the other end of which is connected to a transmission pipe 5, a smoke conveying pipe 6 is vertically welded to the bottom of the transmission pipe 5, and the induced draft fan 4 is used to convey smoke and change the smoke conveying speed; The transmission unit 7 is installed at one end of the transmission pipe 5. The transmission unit 7 is used to convert the flue gas power of different speeds into mechanical power. The transmission unit 7 includes a fixed cover 701, a damper 702, a fixed end plate 703, a fixed rod 704, a connecting rod 705, a stopper 706, a spring 707 and a movable end plate 708. The fixed cover 701 is screwed and fixed to the end of the transmission pipe 5. A damper 702 is provided on one side of the fixed cover 701. The fixed end of the damper 702 is provided with a fixed end plate 70 3. A connecting rod 705 is coaxially arranged at the movable end of the damper 702, one end of the connecting rod 705 is connected to a stopper 706 slidably connected to the transmission pipe 5, a spring 707 is sleeved on the connecting rod 705 between the stopper 706 and the fixed cover 701, a movable end plate 708 is arranged at the movable end of the damper 702, a fixed end plate 703 is arranged at the fixed end of the damper 702, two fixed rods 704 are installed on the fixed cover 701, and the two fixed rods 704 are connected to the fixed end plate 703; A waste heat recovery box 10, one side of which is connected to the smoke conveying pipe 6, a heat conduction box 16 for containing coal is installed in the waste heat recovery box 10, one side of which is provided with a box door 11, a filter box 12 is provided at the top of the waste heat recovery box 10, an exhaust pipe 13 is provided at the top of the filter box 12, and a slag collecting box 14 is provided at the bottom of the waste heat recovery box 10; A stirring assembly 8, wherein the stirring assembly 8 is rotatably mounted on the waste heat recovery box 10, one end of the stirring assembly 8 extends into the heat conduction box 16, and the other end of the stirring assembly 8 is connected and matched with the movable end plate 708, and the stirring assembly 8 is used to stir the coal in the heat conduction box 16 to improve the uniformity of the coal recovery of flue gas waste heat; A cleaning component 9, one end of which is connected to the movable end plate 708, and the other end of which is arranged at the bottom of the heat conduction box 16. The cleaning component 9 is used to clean the smoke and dust on the outer surface of the heat conduction box 16 to improve the efficiency of flue gas waste heat recovery; The plugging component 15 is installed in the slag collecting box 14. The plugging component 15 is used to prevent the flue gas entering the waste heat recovery box 10 from overflowing, thereby improving the waste heat recovery rate of the flue gas.

[0030] During specific implementation, smoke is generated by combustion in the furnace body 2, and the induced draft fan 4 introduces the smoke from the smoke guide pipe 3 into the transmission pipe 5 by cyclically changing the induced draft power, so that the flow rate of the smoke entering the transmission pipe 5 is continuously cyclically changed, thereby generating thrusts of different strengths on the stopper 706, so that the stopper 706 moves back and forth under the cooperation of the spring 707 and the damper 702, which can not only cushion the noise, but also avoid the change of the impact of the smoke on the turning point due to the direct turning connection between the smoke delivery pipe 6 and the transmission pipe 5, which easily causes the inner wall of the pipe at the turning point to become thinner due to long-term scouring, thereby increasing the service life of the pipe and reducing the vibration of the pipe due to the impact of the smoke; When the damper 702 is cushioning and the stopper 706 moves back and forth, the fixed end plate 703 connected to the damper 702 remains in position, while the movable end plate 708 moves back and forth. At the same time, the smoke enters the waste heat recovery box 10 from the smoke conveying pipe 6, and the heat carried by the smoke heats the heat transfer box 16. Therefore, when the movable end plate 708 moves back and forth, the stirring component 8 and the cleaning component 9 are operated, so that the stirring component 8 stirs the coal in the heat transfer box 16, so that the coal can be heated evenly, and the uniformity of smoke recovery is improved. At the same time, the temperature difference can be avoided to improve the heat absorption efficiency of the coal. When the cleaning component 9 is in operation, the smoke dust attached to the outer surface of the heat transfer box 16 can be cleaned to keep the outer surface of the heat transfer box 16 clean, thereby improving the thermal conductivity and the waste heat recovery efficiency. When the flue gas enters the waste heat recovery box 10, the two sealing components 15 seal the bottom of the waste heat recovery box 10 to prevent the flue gas from directly overflowing from the bottom of the waste heat recovery box 10, thereby ensuring that the flue gas is in contact with the heat transfer box 16, improving the waste heat recovery rate of the flue gas and avoiding heat waste.

[0031] A conical groove is arranged at the bottom of the waste heat recovery box 10 , a notch is arranged at the bottom of the conical groove, and a plugging component 15 is installed at the bottom of the notch.

[0032] During specific implementation, the notch at the bottom of the conical groove is sealed by the sealing component 15, which can prevent the incoming flue gas from overflowing from the bottom of the notch, thereby improving the flue gas waste heat recovery rate. At the same time, through the setting of the conical groove, the smoke can easily slide down. When the notch is opened by the sealing component 15, the accumulated smoke can be discharged easily, thereby improving the convenience of smoke waste residue recovery.

[0033] The slag collecting box 14 has a slag leakage opening at the top, and receiving grooves 17 are arranged on both sides of the top of the slag leakage opening. A plugging assembly 15 is installed in each of the receiving grooves 17 . A slag collecting groove 18 is arranged at the bottom of the slag leakage opening.

[0034] The blocking assembly 15 includes an electric push rod 1501 and a blocking plate 1502 . The electric push rod 1501 is installed on the outside of the slag collecting box 14 . The telescopic end of the electric push rod 1501 is connected to the blocking plate 1502 slidably connected to the receiving groove 17 .

[0035] During specific implementation, the electric push rod 1501 is extended and retracted to drag the sealing plate 1502 to move, thereby controlling the connection and closing of the slag leakage port and the slot. When the slag leakage port and the slot are closed, smoke overflow can be avoided. When the slag leakage port and the slot are connected, it is convenient to clean the accumulated smoke and waste.

[0036] Both ends of the movable end plate 708 are provided with mounting holes, and each mounting hole is connected to and matched with one end of the stirring component 8 and the cleaning component 9 respectively.

[0037] The stirring assembly 8 includes a first sleeve 801, a first screw 802, a rotating rod 803 and a stirring plate 804. The first sleeve 801 is installed in a mounting hole opened at the top of the movable end plate 708. The first sleeve 801 is connected and cooperated with the first screw 802. The end of the first screw 802 is connected to a rotating rod 803 that is rotatably connected to the waste heat recovery box 10. The rotating rod 803 is installed with a stirring plate 804 in the heat conduction box 16.

[0038] During specific implementation, the movable end plate 708 moves back and forth, pulling the first sleeve 801 to move, so that the first screw 802 drives the rotating rod 803 to rotate synchronously, so that the stirring plate 804 stirs the coal in the heat transfer box 16, so that the coal can evenly absorb the waste heat of the flue gas, thereby improving the uniformity of waste heat recovery.

[0039] The cleaning assembly 9 includes a second sleeve 901, a second screw 902, a third screw 903, a third sleeve 904, a cleaning scraper 905, a guide block 906 and a guide rod 907. The second sleeve 901 is installed in a mounting hole opened at the bottom of the movable end plate 708. The second sleeve 901 is cooperated with the second screw 902. The end of the second screw 902 is connected to the third screw 903 rotatably connected to the waste heat recovery box 10. The third screw 903 is sleeved with the third sleeve 904. The third sleeve 904 is fixedly connected to the cleaning scraper 905 slidably connected to the outer surface of the heat conduction box 16. Two guide blocks 906 are symmetrically installed at the bottom of the cleaning scraper 905. Each of the guide blocks 906 is slidably connected to a guide rod 907 connected to the inner wall of the waste heat recovery box 10.

[0040] The pitch of the second screw 902 is smaller than the pitch of the third screw 903 .

[0041] During specific implementation, the movable end plate 708 moves back and forth to pull the second sleeve 901 to move, so that the second screw 902 rotates synchronously with the third screw 903, and the pitch of the second screw 902 is smaller than the pitch of the third screw 903, so that the distance of the third sleeve 904 moving back and forth is greater than the distance of the second sleeve 901 moving. Therefore, when the third sleeve 904 moves back and forth, the cleaning scraper 905 can clean the smoke and dust attached to the outer surface of the heat transfer box 16 under the guidance of the guide rod 907 to avoid the adhesion of smoke and dust to reduce the thermal conductivity efficiency of the heat transfer box 16, thereby improving the thermal conductivity efficiency of the heat transfer box 16 and improving the heat absorption efficiency of the coal mine in the heat transfer box 16, thereby improving the efficiency of recovering the waste heat from the flue gas and at the same time, improving the waste heat recovery rate of the flue gas.

[0042] A bracket 1 is installed at the bottom end of the furnace body 2, and an induced draft fan 4 is supported on the bracket 1 on one side of the furnace body 2. The induced draft fan 4 is supported by the bracket 1, so that the stability of the installation of the induced draft fan 4 can be improved.

[0043] Finally, a few points should be explained: First, in the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A boiler flue gas waste heat recovery and utilization device, characterized in that: include: An induced draft fan (4), one end of the induced draft fan (4) is connected to a smoke guide pipe (3), one end of the smoke guide pipe (3) is connected to the top of the furnace body (2), the other end of the induced draft fan (4) is connected to a transmission pipe (5), a smoke conveying pipe (6) is vertically welded to the bottom end of the transmission pipe (5), and the induced draft fan (4) is used to convey smoke and change the smoke conveying speed; A transmission unit (7), the transmission unit (7) being mounted on one end of a transmission pipe (5), the transmission unit (7) being used to convert flue gas power of different speeds into mechanical power, the transmission unit (7) comprising a fixed cover (701), a damper (702), a fixed end plate (703), a fixed rod (704), a connecting rod (705), a stopper (706), a spring (707) and a movable end plate (708), the fixed cover (701) being screwed and fixed to the end of the transmission pipe (5), the damper (702) being arranged on one side of the fixed cover (701), and the fixed end of the damper (702) being arranged on the fixed end thereof 03), a connecting rod (705) is coaxially arranged at the movable end of the damper (702), one end of the connecting rod (705) is connected to a stopper (706) slidably connected to the transmission pipe (5), a spring (707) is sleeved on the connecting rod (705) between the stopper (706) and the fixed cover (701), a movable end plate (708) is arranged at the movable end of the damper (702), a fixed end plate (703) is arranged at the fixed end of the damper (702), two fixed rods (704) are installed on the fixed cover (701), and the two fixed rods (704) are commonly connected to the fixed end plate (703); A waste heat recovery box (10), one side of the waste heat recovery box (10) being connected to the smoke conveying pipe (6), a heat conduction box (16) for containing coal being installed in the waste heat recovery box (10), one side of the heat conduction box (16) being provided with a box door (11), a filter box (12) being provided at the top end of the waste heat recovery box (10), an exhaust pipe (13) being provided at the top end of the filter box (12), and a slag collecting box (14) being provided at the bottom end of the waste heat recovery box (10); A stirring assembly (8), the stirring assembly (8) being rotatably mounted on the waste heat recovery box (10), one end of the stirring assembly (8) extending into the heat conduction box (16), the other end of the stirring assembly (8) being connected and matched with the movable end plate (708), the stirring assembly (8) being used to stir the coal in the heat conduction box (16) to improve the uniformity of the coal recovery of flue gas waste heat; A cleaning component (9), one end of the cleaning component (9) being connected to and cooperating with the movable end plate (708), and the other end of the cleaning component (9) being arranged at the bottom of the heat transfer box (16), the cleaning component (9) being used to clean smoke and dust on the outer surface of the heat transfer box (16) to improve the efficiency of recovering waste heat from smoke; A plugging component (15) is installed in the slag collecting box (14), and the plugging component (15) is used to prevent the flue gas entering the waste heat recovery box (10) from overflowing, thereby improving the waste heat recovery rate of the flue gas.

2. The boiler flue gas waste heat recovery and utilization device according to claim 1 is characterized in that: A conical groove is provided at the bottom end of the waste heat recovery box (10), a notch is provided at the bottom of the conical groove, and a blocking component (15) is installed at the bottom end of the notch.

3. The boiler flue gas waste heat recovery and utilization device according to claim 2 is characterized in that: The slag collecting box (14) has a slag leakage opening at the top, receiving grooves (17) are arranged on both sides of the top of the slag leakage opening, a plugging assembly (15) is installed in each of the receiving grooves (17), and a slag collecting groove (18) is arranged at the bottom of the slag leakage opening.

4. The boiler flue gas waste heat recovery and utilization device according to claim 3 is characterized in that: The plugging assembly (15) comprises an electric push rod (1501) and a plugging plate (1502); the electric push rod (1501) is mounted on the outside of the slag collecting box (14); the telescopic end of the electric push rod (1501) is connected to the plugging plate (1502) which is slidably connected to the storage groove (17).

5. The boiler flue gas waste heat recovery and utilization device according to claim 4 is characterized in that: Both ends of the movable end plate (708) are provided with mounting holes, and each mounting hole is respectively connected to and matched with one end of the stirring component (8) and the cleaning component (9).

6. The boiler flue gas waste heat recovery and utilization device according to claim 5, characterized in that: The stirring assembly (8) comprises a first sleeve (801), a first screw (802), a rotating rod (803) and a stirring plate (804); the first sleeve (801) is installed in a mounting hole opened at the top of the movable end plate (708); the first sleeve (801) is connected and matched with the first screw (802); the end of the first screw (802) is connected to the rotating rod (803) which is rotatably connected to the waste heat recovery box (10); the rotating rod (803) is installed with the stirring plate (804) in the heat transfer box (16).

7. The boiler flue gas waste heat recovery and utilization device according to claim 6, characterized in that: The cleaning assembly (9) comprises a second sleeve (901), a second screw (902), a third screw (903), a third sleeve (904), a cleaning scraper (905), a guide block (906) and a guide rod (907). The second sleeve (901) is mounted in a mounting hole opened at the bottom of the movable end plate (708). The second sleeve (901) is matched with the second screw (902). The end of the second screw (902) is connected to the third screw (903) which is rotatably connected to the waste heat recovery box (10). The third sleeve (904) is sleeved on the third screw (903). The third sleeve (904) is fixedly connected to the cleaning scraper (905) which is slidably connected to the outer surface of the heat conduction box (16). Two guide blocks (906) are symmetrically mounted at the bottom of the cleaning scraper (905). Each of the guide blocks (906) is slidably connected to a guide rod (907) which is connected to the inner wall of the waste heat recovery box (10).

8. The boiler flue gas waste heat recovery and utilization device according to claim 7, characterized in that: The pitch of the second screw (902) is smaller than the pitch of the third screw (903).

9. The boiler flue gas waste heat recovery and utilization device according to claim 8, characterized in that: A bracket (1) is installed at the bottom end of the furnace body (2), and an induced draft fan (4) is supported on the bracket (1) on one side of the furnace body (2).

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