Waste heat recovery boiler

Abstract

The boiler comprises a bottom plate and a boiler body, the boiler body is installed at the upper end of the bottom plate, a combustion cavity and a heating cavity are formed in the boiler body, a smoke exhaust pipeline is installed at the upper end of the combustion cavity, a plurality of direct heat exchange pipes are installed in the smoke exhaust pipeline, and a first three-way pipe is installed at the front ends of the multiple direct heat exchange pipes; an inlet pipe is installed at the rear ends of the multiple straight heat exchange pipes, a cleaning mechanism is arranged in the smoke exhaust pipeline, a smoke exhaust hood is installed at the upper end of the smoke exhaust pipeline, and a second three-way pipe is installed at the upper end of the smoke exhaust hood. High-temperature flue gas in the straight heat exchange pipe and the smoke exhaust pipeline is subjected to efficient heat exchange, heat exchange gas is guided into the second spiral heat exchange pipe in cooperation with the first three-way pipe, liquid in the main heating barrel is preheated, medium-temperature flue gas enters the first spiral heat exchange pipe through the second three-way pipe after being accelerated through the reducing hopper, and liquid in the auxiliary heating barrel is preheated; and through the multi-stage heat exchange design, flue gas waste heat is fully collected, and the energy utilization rate is greatly increased.

Description

Technical Field

[0001] This invention relates to the field of boilers, and more specifically to a boiler for waste heat recovery. Background Technology

[0002] As a core energy conversion device, boilers can convert input energy such as fuel chemical energy and electrical energy into steam, high-temperature water, or organic heat carriers with specific thermal energy. They are widely used in industrial production and daily life, and their energy utilization efficiency has always been a core indicator of industry concern. However, traditional boiler waste heat recovery mechanisms have significant design limitations: the recovery path is singular and the function is one-sided. Current mainstream solutions only perform simple treatment on the high-temperature flue gas emitted from the boiler tail, extracting a portion of the heat through a single heat exchanger. This mode's heat recovery rate can only reach 30%-50% of the total heat carried by the high-temperature flue gas, meaning that more than half of the high-heat is directly discharged into the atmosphere with the flue gas, resulting in heat energy loss. Furthermore, after the boiler is shut down, a large amount of waste heat remains in the fuel chamber and heating chamber. This residual heat accounts for approximately 5%-8% of the total energy consumption of a single heating cycle, but due to the lack of a dedicated recovery mechanism, it is ultimately completely lost through natural heat dissipation, further exacerbating the problem of heat energy waste. Therefore, those skilled in the art have provided a boiler with waste heat recovery to solve the problems mentioned in the background art. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a waste heat recovery boiler, including a bottom plate and a boiler body. The boiler body is installed on the upper part of the bottom plate. A combustion chamber and a heating chamber are arranged inside the boiler body. A flue gas pipe is installed on the upper part of the combustion chamber. A plurality of direct heat exchange tubes are installed inside the flue gas pipe. A T-shaped pipe is installed at the front end of the plurality of direct heat exchange tubes. An inlet pipe is installed at the rear end of the plurality of direct heat exchange tubes. A cleaning mechanism is arranged inside the flue gas pipe. A flue gas hood is installed on the upper part of the flue gas pipe. A T-shaped pipe is installed on the upper part of the flue gas hood. A secondary heating tank and a main heating tank are installed on the upper side of the pot body. A spiral heat exchange tube is installed inside the secondary heating tank. One end of the spiral heat exchange tube is connected to a tee pipe. A conveying pipe is installed at the lower end of the secondary heating tank and is connected to the pot body. The main heating tank is equipped with a spiral heat exchange tube II, one end of which is connected to a tee pipe I. The lower end of the main heating tank is equipped with a conveying pipe II, which is connected to the pot body. The auxiliary heating tank and the main heating tank are equipped with stirring mechanisms. The fuel chamber and the outer surface of the heating chamber are equipped with heat recovery mechanisms.

[0004] Preferably, the heat recovery mechanism includes a metal disc and a rotating cylinder. The metal disc is installed at the bottom of the fuel chamber, and an arc-shaped heat exchange tube is installed inside the metal disc. A spiral heat exchange tube is installed outside the heating chamber. One end of the spiral heat exchange tube is connected to the return pipe, and the other end of the spiral heat exchange tube is connected to the arc-shaped heat exchange tube. One end of the arc-shaped heat exchange tube is connected to the pump body, and an extraction pipe is installed on the side of the pump body.

[0005] Preferably, electric telescopic rods are symmetrically installed on the sides of both the extraction tube and the return tube, and sealing covers are installed on the sides of the two electric telescopic rods.

[0006] Preferably, the rotating cylinder has several water storage chambers inside, temperature sensors are installed on the inner walls of the water storage chambers, an inlet head is installed at the upper end of the water storage chamber, an outlet head is installed on the side of the water storage chamber, a valve is installed on the outer surface of the outlet head, a rotating seat is installed on the rotating cylinder, a ring rack is installed on the outer surface of the rotating seat, the ring rack meshes with a gear, and a motor is installed at the lower end of the gear.

[0007] Preferably, a circular groove is formed at the upper end of the base plate, and the rotating seat is located in the circular groove. An annular groove is formed on the inner wall of the circular groove, and an annular block is set inside the annular groove and fixed to the side of the rotating seat.

[0008] Preferably, the cleaning mechanism includes several tapered buckets and through holes. The tapered buckets are arranged from bottom to top in descending order of size at the outlet. The through holes are opened on the side of the exhaust pipe. A fixed cover is installed on the side of the exhaust pipe corresponding to the position of the through hole. A circular block is rotatably connected inside the fixed cover. Several push plates are installed on the side of the circular block. A loop frame is installed on one end of the push plate in the counterclockwise direction.

[0009] Preferably, a large bevel gear is installed at the front end of the circular block, and a movable plate is fitted on the outer surface of several direct heat exchange tubes. The movable plate slides in contact with the inner wall of the flue pipe. A mating hole is opened inside the movable plate corresponding to the position of the direct heat exchange tube. A brush is installed on the inner wall of the mating hole, and the brush contacts the surface of the direct heat exchange tube.

[0010] Preferably, a reciprocating block is installed on the upper end of the movable plate, a reciprocating screw is provided inside the reciprocating block, a small bevel gear is installed at the front end of the reciprocating screw, a transmission rod is rotatably connected to the front end of the exhaust pipe, and small bevel gears are installed at both ends of the transmission rod. One small bevel gear meshes with a large bevel gear, and the other small bevel gear meshes with a small bevel gear.

[0011] Preferably, the stirring mechanism includes a stirring shaft and a rotating rod. The two stirring shafts are rotatably connected to the auxiliary heating tank and the main heating tank, respectively. Stirring plates are symmetrically installed on the outer surface of the stirring shafts, and a small bevel gear is installed on the upper end of the stirring shafts.

[0012] Preferably, the auxiliary heating tank and the main heating tank are both provided with a rotating rod at their upper ends. A motor is installed on the side of the rotating rod, and two small bevel gears are installed on the outer surface of the rotating rod, with the small bevel gears meshing with the small bevel gears.

[0013] This invention utilizes a direct heat exchange tube to efficiently exchange heat with the high-temperature flue gas in the exhaust pipe. A three-way pipe guides the heat exchange gas into a spiral heat exchange tube to preheat the liquid in the main heating tank. Simultaneously, the high-temperature flue gas, after heat exchange, becomes medium-temperature flue gas. This medium-temperature flue gas is accelerated by a converging hopper and then enters the spiral heat exchange tube through the three-way pipe to preheat the liquid in the auxiliary heating tank. This multi-stage heat exchange design allows for the full collection of waste heat from the flue gas, significantly improving energy utilization. Furthermore, it preheats the liquid for subsequent heating, enhancing the efficiency of subsequent operations.

[0014] This invention uses a brush to promptly clean the dust accumulated on the surface of the direct heat exchange tube, preventing a decrease in heat exchange efficiency and ensuring stable equipment operation. At the same time, the arc-shaped heat exchange tube inside the metal disc and the spiral heat exchange tube outside the heating chamber can efficiently absorb the residual heat in the fuel chamber and heating chamber. In conjunction with components such as the rotating cylinder, water storage chamber, and sealing cover, the waste heat can be continuously collected and stored, maximizing the utilization of residual waste heat. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a structural schematic diagram of the smoke exhaust duct of this application; Figure 3 This is a structural diagram of the liquidation organization for this application; Figure 4 This is a structural schematic diagram of the auxiliary heating tank and the main heating tank of this application; Figure 5 This is a schematic diagram of the heat recovery mechanism of this application; Figure 6 This is a schematic diagram of the structure of the metal disk of this application; Figure 7 This is a schematic diagram of the structure of the sealing cover of this application; In the diagram: 1. Boiler plate; 2. Boiler body; 3. Steam pipe; 4. Exhaust pipe; 5. Direct heat exchange pipe; 6. T-connector; 7. Valve; 8. Inlet pipe; 9. Converging hopper; 10. Reciprocating lead screw; 11. Reciprocating block; 12. Moving plate; 13. Mating hole; 14. Brush; 15. Small bevel gear one; 16. Through hole; 17. Fixing cover; 18. Round block; 19. Push plate; 20. Rectangular frame; 21. Large bevel gear; 22. Drive rod; 23. Small bevel gear II; 24. Exhaust hood; 25. Two tee pipes; 26. Two valves; 27. Secondary heating tank; 28. One spiral heat exchange tube; 29. ​​One conveying pipe; 30. Valve 3; 31. Liquid Inlet Pipe 1; 32. Main Heating Tank; 33. Spiral Heat Exchange Pipe 2; 34. Conveying Pipe 2; 35. Valve 4; 36. Liquid Inlet Pipe 2; 37. Stirring Shaft; 38. Stirring Plate; 39. Small Bevel Gear 3; 40. Rotating rod; 41. Small bevel gear four; 42. Motor one; 43. Metal disc; 44. Arc-shaped heat exchange tube; 45. Spiral heat exchange tube three; 46. Return pipe; 47. Pump body; 48. Electric telescopic rod; 49. Sealing cover; 50. Rotating cylinder; 51. Inlet head; 52. Outlet head; 53. Rotating seat; 54. Annular block; 55. Annular rack; 56. Gear; 57. Motor II. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

[0018] like Figures 1-7 As shown, a waste heat recovery boiler includes a base plate 1 and a boiler body 2. The boiler body 2 is installed on the upper end of the base plate 1. The boiler body 2 has a combustion chamber for burning fuel and a heating chamber for heating liquid. A steam pipe 3 for discharging steam is installed on the upper end of the heating chamber, and a flue gas pipe 4 for discharging high-temperature flue gas is installed on the upper end of the combustion chamber. Several direct heat exchange tubes 5 are installed inside the flue gas pipe 4 for heat exchange. A three-way pipe 6 is installed at the front end of the several direct heat exchange tubes 5. One end of the three-way pipe 6 is connected to a heat utilization device for further utilizing waste heat energy. Two valves 7 are installed on the outer surface of the three-way pipe 6. An inlet pipe 8 is installed at the rear end of the several direct heat exchange tubes 5. The exhaust pipe 4 is equipped with a cleaning mechanism to clean the dust on the surface of the direct heat exchange pipe 5. The exhaust pipe 4 is equipped with an exhaust hood 24 to discharge medium-temperature flue gas. The exhaust hood 24 is equipped with a three-way pipe 25 at the top. One end of the three-way pipe 25 is connected to a heat utilization device for additional use of waste heat energy. Two valves 26 are installed on the outer surface of the three-way pipe 25 to add fuel into the fuel chamber for combustion and heat the liquid in the heating chamber. The high-temperature flue gas generated by fuel combustion enters the exhaust pipe 4. At the same time, the heat exchange gas enters several direct heat exchange pipes 5 through the inlet pipe 8 and exchanges heat with the high-temperature flue gas through the direct heat exchange pipes 5.

[0019] The upper side of the pot body 2 is provided with a secondary heating tank 27 and a main heating tank 32 for loading the next round of heating liquid. The secondary heating tank 27 and the main heating tank 32 are fixed to the upper end of the base plate 1 by uprights. The secondary heating tank 27 is provided with a spiral heat exchange tube 28 for heat exchange. One end of the spiral heat exchange tube 28 is connected to a three-way pipe 25, and the other end of the spiral heat exchange tube 28 passes through the secondary heating tank 27. A conveying pipe 29 is installed at the lower end of the secondary heating tank 27 and is connected to the pot body 2. A valve 30 is installed on the outer surface of the conveying pipe 29. A liquid inlet pipe 31 is installed at the upper end of the secondary heating tank 27. Medium-temperature flue gas enters the spiral heat exchange tube 28 through the three-way pipe 25 and exchanges heat with the liquid inside the secondary heating tank 27 to preheat it and make full use of the waste heat of the high-temperature flue gas.

[0020] The main heating tank 32 is equipped with a spiral heat exchange tube 2 33 for heat exchange. One end of the spiral heat exchange tube 2 33 is connected to the tee pipe 1 6, and the other end of the spiral heat exchange tube 2 33 passes through the main heating tank 32. The lower end of the main heating tank 32 is equipped with a conveying pipe 2 34, which is connected to the pot body 2. A valve 4 35 is installed on the outer surface of the conveying pipe 2 34. The upper end of the main heating tank 32 is equipped with a liquid inlet pipe 2 36. The auxiliary heating tank 27 and the main heating tank 32 are equipped with a stirring mechanism to improve the waste heat efficiency. The gas after heat exchange enters the spiral heat exchange tube 2 33 through the tee pipe 1 6, thereby preheating the liquid in the main heating tank 32.

[0021] A heat recovery mechanism for recovering residual heat is provided on the outer surfaces of both the fuel chamber and the heating chamber. The heat recovery mechanism includes a metal disc 43 and a rotating cylinder 50. The metal disc 43 is located at the bottom of the fuel chamber for heat exchange. An arc-shaped heat exchange tube 44 for heat exchange is located inside the metal disc 43. A spiral heat exchange tube 45 for heat exchange is located outside the heating chamber. One end of the spiral heat exchange tube 45 is connected to a return pipe 46, and the other end is connected to the arc-shaped heat exchange tube 44. One end of the arc-shaped heat exchange tube 44 is connected to a pump body 47. An extraction pipe is installed on the side of the pump body 47. Electric telescopic rods 48 are symmetrically installed on the sides of the extraction pipe and return pipe 46. Sealing covers 49 for connecting and conveying liquid are installed on the sides of the two electric telescopic rods 48. Several water storage chambers are set inside the rotating cylinder 50 to store water. Temperature sensors for sensing water temperature are installed on the inner walls of the water storage chambers. An inlet head 51 is installed at the upper end of the water storage chamber, and a discharge head 52 is installed on the side of the water storage chamber. A valve is installed on the outer surface of the discharge head 52. A rotating seat 53 is installed on the rotating cylinder 50. A ring rack 55 is installed on the outer surface of the rotating seat 53. The ring rack 55 meshes with a gear 56. An electric... Machine 2 57, the upper end of the base plate 1 has a circular groove, and the rotating seat 53 is located in the circular groove. The inner wall of the circular groove has an annular groove, and an annular block 54 is set inside the annular groove. The annular block 54 is fixed to the side of the rotating seat 53. The pump body 47 pumps the liquid in the water storage chamber to the arc-shaped heat exchange tube 44 and the spiral heat exchange tube 45 for heat exchange through the extraction pipe, sealing cover 49 and discharge head 52. The preheating heat inside the fuel chamber and heating chamber is carried away to heat the water. Then, the water returns to the water storage chamber through the return pipe 46 for storage. The temperature in the water storage chamber is sensed by the temperature sensor. When the water temperature in the water storage chamber reaches the set temperature, the pump body 47 pumps the liquid in the water storage chamber to the arc-shaped heat exchange tube 44 and the spiral heat exchange tube 45 for heat exchange ... The preheating heat inside the fuel chamber and heating chamber is carried away to heat the water. The preheating heat inside the fuel chamber and heating chamber is carried away to heat the water. The preheating heat inside the fuel chamber and heating chamber is carried away to heat the water. The preheating heat inside the fuel chamber and heating chamber is carried away to heat the water. The preheating heat inside the fuel chamber and heating chamber is carried away to heat the water. The preheating heat inside the fuel chamber and heating chamber is carried away to heat the water. The preheating heat inside the fuel chamber and heating chamber When a temperature is required, valve five closes, pump body 47 stops working, and then electric telescopic rod 48 drives sealing cover 49 away from inlet head 51 and outlet head 52. Motor two 57 drives rotating seat 53 to rotate intermittently through gear 56 and ring rack 55. Rotating seat 53 drives rotating cylinder 50 to rotate intermittently, so that the unheated water storage chamber rotates to the direction of pot body 2. Then, electric telescopic rod 48 drives sealing cover 49 to move and cover inlet head 51 and outlet head 52. Then, the waste heat collection work of heating chamber and fuel chamber continues, maximizing the collection of residual waste heat in heating chamber and fuel chamber.

[0022] The cleaning mechanism includes several tapered buckets 9 and through holes 16. The tapered buckets 9 are arranged from bottom to top in descending order of size at the outlet. The through holes 16 are opened on the side of the exhaust duct 4. A fixed cover 17 is installed on the side of the exhaust duct 4 corresponding to the position of the through hole 16. A circular block 18 is rotatably connected inside the fixed cover 17. Several push plates 19 are installed on the side of the circular block 18 to push the circular block 18. A U-shaped frame 20 is installed at one end of the push plate 19 in the counterclockwise direction to increase the force on the push plate 19. A large bevel gear 21 is installed at the front end of the circular block 18. A movable plate 12 for reciprocating movement is fitted on the outer surface of several direct heat exchange tubes 5. The movable plate 12 slides in contact with the inner wall of the exhaust duct 4. Matching holes 13 are opened inside the movable plate 12 corresponding to the positions of the direct heat exchange tubes 5. A brush 14 for cleaning dust is installed on the inner wall of the matching hole 13. The brush 14 contacts the surface of the direct heat exchange tube 5. The upper end of the movable plate 12 is equipped with... A reciprocating block 11 is installed, and a reciprocating screw 10 is installed inside the reciprocating block 11. A small bevel gear 15 is installed at the front end of the reciprocating screw 10. The front end of the flue pipe 4 is rotatably connected to the transmission rod 22. Small bevel gears 23 are installed at both ends of the transmission rod 22. One small bevel gear 23 meshes with a large bevel gear 21, and the other small bevel gear 23 meshes with the small bevel gear 15. The medium-temperature flue gas increases its flow velocity through multiple gradually narrowing hoppers 9, causing the medium-temperature flue gas to impact the loop frame 20 and the push plate 19. The push plate 19 pushes the circular block 18 to rotate. The circular block 18 drives the large bevel gear 21 to rotate. The large bevel gear 21 drives the reciprocating screw 10 to rotate through the small bevel gear 23, the transmission rod 22, and the small bevel gear 15. The reciprocating screw 10 drives the moving plate 12 to move back and forth through the reciprocating block 11. The moving plate 12 drives the brush 14 to move back and forth to clean the surface of the direct heat exchange tube 5 to prevent ash accumulation from affecting the heat exchange efficiency.

[0023] The stirring mechanism includes a stirring shaft 37 and a rotating rod 40. The two stirring shafts 37 are rotatably connected to the auxiliary heating tank 27 and the main heating tank 32, respectively. Stirring plates 38 for stirring the liquid are symmetrically installed on the outer surface of the stirring shafts 37. Small bevel gears 39 are installed on the upper end of the stirring shafts 37. The rotating rod 40 is provided on the upper end of the auxiliary heating tank 27 and the main heating tank 32. A motor 42 is installed on the side of the rotating rod 40. Two small bevel gears 41 are installed on the outer surface of the rotating rod 40, and the small bevel gears 41 and 39 mesh with each other. The motor 42 drives the rotating rod 40 to rotate. The rotating rod 40 drives the stirring shaft 37 to rotate through the small bevel gears 41 and 39. The stirring shaft 37 drives the stirring plates 38 to rotate to stir the liquid and improve the preheating efficiency of the liquid.

[0024] The working principle of this invention is as follows: liquid is added to the heating chamber, the auxiliary heating tank 27 and the main heating tank 32. Fuel is added to the fuel chamber for combustion, which heats the liquid in the heating chamber. The high-temperature flue gas generated by the fuel combustion enters the exhaust pipe 4. At the same time, the heat exchange gas enters several direct heat exchange tubes 5 through the inlet pipe 8. The direct heat exchange tubes 5 exchange heat with the high-temperature flue gas. After the heat exchange, the gas enters the spiral heat exchange tube 33 through the three-way pipe 6, thereby preheating the liquid in the main heating tank 32. After the high-temperature flue gas undergoes heat exchange through the direct heat exchange tube 5, it retains a certain temperature, transforming into medium-temperature flue gas. The medium-temperature flue gas increases its flow velocity through multiple gradually narrowing hoppers 9, causing it to impact the spiral frame 20 and the push plate 19. The push plate 19 drives the circular block 18 to rotate, which in turn drives the large bevel gear 21 to rotate. The large bevel gear 21 drives the reciprocating screw 10 to rotate through the small bevel gear 23, the transmission rod 22, and the small bevel gear 15. The reciprocating screw 10 drives the moving plate 12 to move back and forth through the reciprocating block 11. The moving plate 12 drives the brush 14 to move back and forth to clean the surface of the direct heat exchange tube 5, preventing dust accumulation from affecting the heat exchange efficiency. Then, the medium-temperature flue gas enters the spiral heat exchange tube 28 through the three-way pipe 25, where it exchanges heat with the liquid inside the auxiliary heating tank 27, thereby preheating it and making full use of the residual heat of the high-temperature flue gas. When the spiral heat exchange tube 28 and the spiral heat exchange tube 33 are exchanging heat, the motor 42 drives the rotating rod 40 to rotate. The rotating rod 40 drives the stirring shaft 37 to rotate through the small bevel gear 41 and the small bevel gear 39. The stirring shaft 37 drives the stirring plate 38 to rotate to stir the liquid and improve the preheating efficiency of the liquid. When the final heating cycle is completed and no further preheating is required, control valves 1-7 and 2-6 prevent high-temperature and medium-temperature flue gas from entering spiral heat exchange tubes 2-33 and 1-28. Instead, the high-temperature and medium-temperature flue gas is directly discharged to other places for use (such as hot water heating, heating, etc.) through tee pipes 1-6 and 2-25. After the heating chamber and fuel chamber have completed their final operation, residual heat remains inside. Valve 5 of the discharge head 52 opens, and pump 47, through the extraction pipe, sealing cover 49, and discharge head 52, pumps the liquid from the water storage chamber into the arc-shaped heat exchange tube 44 and spiral heat exchange tube 45 for heat exchange. This removes the preheating heat from the fuel chamber and heating chamber, heating the water. The water then returns to the water storage chamber through the return pipe 46. A temperature sensor detects the temperature inside the water storage chamber. When the water temperature reaches the required level, valve 5 closes, and pump 47... The operation stops, and then the electric telescopic rod 48 drives the sealing cover 49 away from the inlet head 51 and the outlet head 52. The motor 57 drives the rotating seat 53 to rotate intermittently through the meshing of the gear 56 and the ring rack 55. The rotating seat 53 drives the rotating cylinder 50 to rotate intermittently, so that the unheated water storage chamber rotates to the direction of the pot body 2. Then, the electric telescopic rod 48 drives the sealing cover 49 to move and cover the inlet head 51 and the outlet head 52. Then, the waste heat collection work of the heating chamber and the fuel chamber continues, maximizing the collection of residual waste heat in the heating chamber and the fuel chamber.

[0025] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A waste heat recovery boiler, comprising a bottom plate (1) and a boiler body (2), characterized in that, The bottom plate (1) is equipped with a pot body (2) at the upper end. The pot body (2) is equipped with a combustion chamber and a heating chamber. The combustion chamber is equipped with a flue pipe (4) at the upper end. The flue pipe (4) is equipped with several direct heat exchange tubes (5). The front end of the several direct heat exchange tubes (5) is equipped with a three-way pipe (6). The rear end of the several direct heat exchange tubes (5) is equipped with an inlet pipe (8). The flue pipe (4) is equipped with a cleaning mechanism. The flue pipe (4) is equipped with a smoke hood (24) at the upper end. The smoke hood (24) is equipped with a three-way pipe (25) at the upper end. A secondary heating barrel (27) and a main heating barrel (32) are provided on the upper side of the pot body (2). A spiral heat exchange tube (28) is provided inside the secondary heating barrel (27). One end of the spiral heat exchange tube (28) is connected to a three-way pipe (25). A conveying pipe (29) is installed at the lower end of the secondary heating barrel (27), and the conveying pipe (29) is connected to the pot body (2). The main heating tank (32) is equipped with a spiral heat exchange tube II (33), one end of which is connected to a three-way pipe I (6). The lower end of the main heating tank (32) is equipped with a conveying pipe II (34), which is connected to the pot body (2). The auxiliary heating tank (27) and the main heating tank (32) are equipped with a stirring mechanism. The fuel chamber and the outer surface of the heating chamber are equipped with a heat recovery mechanism.

2. The waste heat recovery boiler according to claim 1, characterized in that, The heat recovery mechanism includes a metal disc (43) and a rotating cylinder (50). The metal disc (43) is set at the bottom of the fuel chamber. An arc-shaped heat exchange tube (44) is set inside the metal disc (43). A spiral heat exchange tube (45) is set outside the heating chamber. One end of the spiral heat exchange tube (45) is connected to the return pipe (46). The other end of the spiral heat exchange tube (45) is connected to the arc-shaped heat exchange tube (44). One end of the arc-shaped heat exchange tube (44) is connected to the pump body (47). An extraction pipe is installed on the side of the pump body (47).

3. A waste heat recovery boiler according to claim 2, characterized in that, Electric telescopic rods (48) are symmetrically installed on the sides of the extraction tube and the return tube (46), and sealing covers (49) are installed on the sides of the two electric telescopic rods (48).

4. A waste heat recovery boiler according to claim 2, characterized in that, The rotating cylinder (50) has several water storage chambers inside. Temperature sensors are installed on the inner walls of the water storage chambers. An inlet head (51) is installed at the upper end of the water storage chamber. An outlet head (52) is installed on the side of the water storage chamber. A valve is installed on the outer surface of the outlet head (52). A rotating seat (53) is installed on the rotating cylinder (50). A ring rack (55) is installed on the outer surface of the rotating seat (53). The ring rack (55) meshes with a gear (56). A motor (57) is installed at the lower end of the gear (56).

5. A waste heat recovery boiler according to claim 1, characterized in that, A circular groove is opened at the upper end of the base plate (1), and the rotating seat (53) is located in the circular groove. An annular groove is opened on the inner wall of the circular groove, and an annular block (54) is set inside the annular groove. The annular block (54) is fixed on the side of the rotating seat (53).

6. A waste heat recovery boiler according to claim 1, characterized in that, The cleaning mechanism includes several tapered buckets (9) and through holes (16). The tapered buckets (9) are arranged from bottom to top in order of size from the outlet. The through holes (16) are opened on the side of the exhaust pipe (4). A fixed cover (17) is installed on the side of the exhaust pipe (4) corresponding to the position of the through hole (16). The fixed cover (17) is connected to a rotating round block (18) inside. Several push plates (19) are installed on the side of the round block (18). A loop frame (20) is installed at one end of the push plate (19) in the counterclockwise direction.

7. A waste heat recovery boiler according to claim 6, characterized in that, The circular block (18) is equipped with a large bevel gear (21) at its front end. A movable plate (12) is fitted on the outer surface of several direct heat exchange tubes (5). The movable plate (12) slides in contact with the inner wall of the exhaust pipe (4). A mating hole (13) is opened inside the movable plate (12) corresponding to the position of the direct heat exchange tube (5). A brush (14) is installed on the inner wall of the mating hole (13), and the brush (14) contacts the surface of the direct heat exchange tube (5).

8. A waste heat recovery boiler according to claim 7, characterized in that, The upper end of the moving plate (12) is equipped with a reciprocating block (11), and a reciprocating screw (10) is set inside the reciprocating block (11). A small bevel gear (15) is installed at the front end of the reciprocating screw (10). The front end of the exhaust pipe (4) is rotatably connected to the transmission rod (22). Small bevel gears (23) are installed at both ends of the transmission rod (22). One small bevel gear (23) meshes with the large bevel gear (21), and the other small bevel gear (23) meshes with the small bevel gear (15).

9. A waste heat recovery boiler according to claim 1, characterized in that, The stirring mechanism includes a stirring shaft (37) and a rotating rod (40). The two stirring shafts (37) are rotatably connected in the auxiliary heating tank (27) and the main heating tank (32), respectively. Stirring plates (38) are symmetrically installed on the outer surface of the stirring shaft (37), and a small bevel gear (39) is installed on the upper end of the stirring shaft (37).

10. A waste heat recovery boiler according to claim 1, characterized in that, The auxiliary heating barrel (27) and the main heating barrel (32) are both equipped with a rotating rod (40) at their upper ends. A motor (42) is installed on the side of the rotating rod (40), and two small bevel gears (41) are installed on the outer surface of the rotating rod (40). The small bevel gears (41) and the small bevel gears (39) mesh with each other.

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