Boiler flue gas circulating device

Abstract

The invention discloses a boiler flue gas circulating device, and relates to the technical field of flue gas treatment.The boiler flue gas circulating device specifically comprises a communicating pipe and a boiler body, the left end of the communicating pipe is in flange connection with a pretreatment pipe, the end, away from the communicating pipe, of the pretreatment pipe is in flange connection with a flue gas outlet of the boiler body, and a first filter plate is fixedly installed on the inner wall of the communicating pipe; and the inner wall of the pretreatment pipe is fixedly sleeved with a second filter plate. Through cooperation of the communicating pipe, the pretreatment pipe, the first filter plate, the second filter plate, a heat recovery box and a heat exchange bent pipe, heat in boiler flue gas is recovered through the arrangement of the heat recovery box, particulate matter in the flue gas is blocked through the first filter plate and the second filter plate, and the heat in the flue gas is recovered through the heat recovery box. The flue gas subjected to impurity removal enters the heat exchange bent pipe and is matched with the heat exchange plate to make contact with water in the heat recovery box, the water in the heat recovery box can be heated through heat in the flue gas, and therefore the effect of recycling the heat in the flue gas is achieved.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment, specifically to a boiler flue gas recirculation device. Background Technology

[0002] A boiler is an energy conversion device. The energy input to a boiler includes the chemical energy of fuel and electrical energy. The boiler outputs steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy. The hot water or steam produced in the boiler can directly provide the heat energy required for industrial production and people's lives. It can also be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator. Boilers that provide hot water are called hot water boilers, which are mainly used for domestic purposes, and also have a small number of applications in industrial production. Boilers that produce steam are called steam boilers, often simply referred to as boilers. They are mostly used in thermal power plants, ships, locomotives, and industrial and mining enterprises. During the use of a boiler, in order to prevent the combustion from weakening or even going out due to lack of oxygen, the waste gas in the boiler needs to be discharged in a timely manner.

[0003] However, in order to avoid environmental pollution, existing boilers add a treatment step for pollutants in the flue gas after it is discharged. The heat in the flue gas is also discharged along with the treated gas. At this time, the heat in the flue gas cannot be recovered in time, resulting in the waste of heat in the flue gas. Summary of the Invention

[0004] This application proposes a boiler flue gas recirculation device, which has the following advantages: the boiler flue gas is treated and then recirculated back into the boiler; the heat energy in the flue gas discharged from the boiler can be recovered; the pollution caused by direct discharge of flue gas to the environment is avoided; and the technical problems mentioned in the background art are solved.

[0005] To achieve the above objectives, this application adopts the following technical solution: a boiler flue gas circulation device, comprising a connecting pipe and a boiler body, wherein a pretreatment pipe is connected to the left flange of the connecting pipe, and the end of the pretreatment pipe away from the connecting pipe is connected to the flue gas outlet flange of the boiler body; a first filter plate is fixedly installed on the inner wall of the connecting pipe, and a second filter plate is fixedly sleeved on the inner wall of the pretreatment pipe; a scraper is provided on the left side of both the first and second filter plates, and an electric push rod is movably installed on the scraper by fastening bolts; a heat exchange bend is fixedly installed on the right end of the connecting pipe, and a heat recovery box is fixedly sleeved on the outer wall of the heat exchange bend; a water storage tank is fixedly installed on the right side of the heat recovery box through a pipe; a dust suppression chamber is bolted to the upper end of the water storage tank; a water pump is connected to the right side of the water storage tank through a pipe; a plurality of water nozzles located inside the dust suppression chamber are connected to the end of the water pump away from the water storage tank through a pipe; a first fan is fixedly installed on the upper end of the dust suppression chamber, and a second fan is fixedly connected to the rear of the first fan through a pipe.

[0006] Preferably, the lower end of the pretreatment tube is fixedly installed with a first impurity discharge tube located on the left side of the second filter plate, and the lower end of the first impurity discharge tube is movably connected to a first impurity collection box. The lower end of the connecting tube is fixedly installed with a second impurity discharge tube located on the left side of the first filter plate, and the lower end of the second impurity discharge tube is movably connected to a second impurity collection box. Anti-slip rubber pads are fixedly installed at the connection between the second impurity collection box and the second impurity discharge tube and at the connection between the first impurity discharge tube and the first impurity collection box.

[0007] Preferably, a side plate is fixedly installed at the lower end of the output shaft of the electric push rod, and a round rod is fixedly connected to the end of the side plate away from the electric push rod. An annular plate is movably sleeved on the outer wall of the round rod by fastening bolts, and the right side of the annular plate is fixedly connected to the left side of the scraper.

[0008] Preferably, a plurality of heat exchange plates are fixedly installed on both the front and back sides of the heat exchange bend, and the end of the heat exchange plate away from the heat exchange bend is fixedly connected to the inner wall of the heat recovery box. A flue pipe is fixedly installed on the right end of the heat exchange bend, and a flue pipe located inside the water storage tank is fixedly connected to the end of the flue pipe away from the heat exchange bend. A flue pipe is fixedly installed on the left end of the heat exchange bend, and the end of the flue pipe away from the heat exchange bend is fixedly connected to the right end of the connecting pipe.

[0009] Preferably, a first water inlet pipe is fixedly installed on the upper left side of the heat recovery box, and a first drain pipe located below the first water inlet pipe is fixedly connected to the left side of the heat recovery box. The bottom surface of the inner wall of the heat recovery box is set as a slope that is lower on the left and higher on the right.

[0010] Preferably, a second water inlet pipe is fixedly installed on the upper right side of the water storage tank, a second drain pipe located below the second water inlet pipe is fixedly connected to the right side of the water storage tank, and the right side of the water storage tank is fixedly connected to the water pump.

[0011] Preferably, an inlet pipe is fixedly installed on the left end of the water pump, and the end of the inlet pipe away from the water pump extends into the interior of the water storage tank. A filter screen located inside the water storage tank is fixedly installed on the inner wall of the left end of the inlet pipe. An outlet pipe is fixedly connected to the right end of the water pump, and the end of the outlet pipe away from the water pump extends into the interior of the dust suppression chamber and is connected to the water outlet nozzle pipe.

[0012] Preferably, a water inlet pipe is fixedly installed at the upper end of the water outlet nozzle, and the right side of the water inlet pipe is fixedly connected to the upper end of the water outlet pipe. A support plate is fixedly installed on the left side of the water inlet pipe, and the side of the support plate away from the water inlet pipe is fixedly connected to the inner wall of the dust suppression chamber.

[0013] Preferably, a first air inlet pipe is fixedly installed on the right side of the first fan, and the end of the first air inlet pipe away from the first fan is fixedly connected to the upper end of the dust settling chamber. An activated carbon plate is installed at the connection between the first air inlet pipe and the dust settling chamber. A first air outlet pipe located in front of the second fan is fixedly installed on the left side of the first fan, and the back of the first air outlet pipe is connected to the pipe of the second fan. A first mounting plate is fixedly installed at the lower end of the first fan, and the right side of the first mounting plate is fixedly connected to the left side of the dust settling chamber. The left end of the first air outlet pipe extends into the boiler body.

[0014] Preferably, a second air inlet pipe is fixedly installed on the front of the second fan, and the end of the second air inlet pipe away from the second fan extends into the interior of the first air outlet pipe. A second air outlet pipe is fixedly installed on the back of the second fan. A second mounting plate is fixedly installed at the lower end of the second fan, and the right side of the second mounting plate is fixedly connected to the left side of the dust settling chamber.

[0015] The present invention has the following beneficial effects:

[0016] 1. This invention utilizes the cooperation between the connecting pipe, pretreatment pipe, first filter plate, second filter plate, heat recovery box, and heat exchange bend to achieve the recovery of heat from boiler flue gas. By using the first and second filter plates to block particulate matter in the flue gas, the purified flue gas enters the heat exchange bend and comes into contact with the water in the heat recovery box. This allows the heat in the flue gas to heat the water in the heat recovery box, thereby achieving the effect of recovering and utilizing heat from the flue gas.

[0017] 2. This invention utilizes the cooperation between the connecting pipe, pretreatment pipe, first filter plate, second filter plate, scraper, and electric push rod. By using the scraper, it achieves the cleaning of impurities attached to the first and second filter plates. The electric push rod uses its internal output shaft to drive the scraper to move on the first and second filter plates, so that the dust adhering to the first and second filter plates can be scraped off onto the impurity collection box, thereby preventing the dust covering the first and second filter plates from interfering with the passage of flue gas.

[0018] 3. The present invention achieves the connection between the scraper and the electric push rod by means of the cooperation between the first filter plate, the second filter plate, the scraper, the electric push rod and the fastening bolt. By changing the connection method between the fastening bolt and the scraper or the electric push rod, the scraper can be removed from the output shaft of the electric push rod, thereby facilitating the replacement of the worn scraper. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2In the structure of this invention Figure 1 Rear view diagram;

[0021] Figure 3 This is a schematic diagram of the internal structure of the dust collection chamber in the structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the heat recovery box in the structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the second filter plate in the structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the internal structure of the pretreatment tube in the structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the scraper in the structure of the present invention.

[0026] In the diagram: 1. Connecting pipe; 2. Pretreatment pipe; 3. First filter plate; 4. Second filter plate; 5. Scraper; 6. Fastening bolt; 7. Electric push rod; 8. Heat exchanger bend; 9. Heat recovery box; 10. Water storage tank; 11. Water pump; 12. Dust settling chamber; 13. Water nozzle; 14. First fan; 15. Second fan; 16. First impurity discharge pipe; 17. First impurity collection box; 18. Second impurity discharge pipe; 19. Second impurity collection box; 20. Side plate ; 21. Round rod; 22. Annular plate; 23. Heat exchange fin; 24. Exhaust pipe; 25. Inlet pipe; 26. First drain pipe; 27. First water supply pipe; 28. Smoke guide pipe; 29. ​​Second water supply pipe; 30. Second drain pipe; 31. Water inlet pipe; 32. Water outlet pipe; 33. Water guide pipe; 34. Support plate; 35. First air inlet pipe; 36. First air outlet pipe; 37. First mounting plate; 38. Second air inlet pipe; 39. Second air outlet pipe; 40. Second mounting plate. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described in conjunction with preferred embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1 , Figure 3 and Figure 4A boiler flue gas recirculation device includes a connecting pipe 1 and a boiler body. A pretreatment pipe 2 is connected to the left flange of the connecting pipe 1, and the end of the pretreatment pipe 2 away from the connecting pipe 1 is connected to the flue gas outlet flange of the boiler body. A first filter plate 3 is fixedly installed on the inner wall of the connecting pipe 1, and a second filter plate 4 is fixedly sleeved on the inner wall of the pretreatment pipe 2. Scrapers 5 are provided on the left sides of both the first filter plate 3 and the second filter plate 4. The scrapers 5 clean impurities adhering to the first filter plate 3 and the second filter plate 4. The scrapers are moved on the first filter plate 3 and the second filter plate 4 by the output shaft of an electric push rod 7, so that the dust adhering to the first filter plate 3 and the second filter plate 4 can be scraped off to the impurity collection box, thereby preventing the dust covering the first filter plate 3 and the second filter plate 4 from interfering with the flue gas passage. The electric push rod 7 is movably installed on the scrapers 5 by fastening bolts 6. The right end of the connecting pipe 1 is fixed. A heat exchange bend 8 is installed, and a heat recovery box 9 is fixedly sleeved on the outer wall of the heat exchange bend 8. The heat recovery box 9 is used to realize the heat recovery of the boiler flue gas. The first filter plate 3 and the second filter plate 4 are used to block the particulate matter in the flue gas, so that the flue gas after impurity removal enters the heat exchange bend 8 and comes into contact with the water in the heat recovery box 9. The heat in the flue gas can heat the water in the heat recovery box 9, thereby achieving the effect of recovering and utilizing the heat in the flue gas. A water storage tank 10 is fixedly installed on the right side of the heat recovery box 9 through a pipe. A dust settling chamber 12 is bolted to the upper end of the water storage tank 10. A water pump 11 is connected to the right side of the water storage tank 10 through a pipe. The end of the water pump 11 away from the water storage tank 10 is connected to several water nozzles 13 located inside the dust settling chamber 12 through a pipe. A first fan 14 is fixedly installed at the upper end of the dust settling chamber 12. A second fan 15 is fixedly connected to the rear of the first fan 14 through a pipe.

[0029] The lower end of the pretreatment pipe 2 is fixedly installed with a first impurity discharge pipe 16 located to the left of the second filter plate 4. The lower end of the first impurity discharge pipe 16 is movably connected to a first impurity collection box 17. The flue gas entering the pretreatment pipe 2 first passes through the second filter plate 4. The second filter plate 4 is designed to block particulate matter in the flue gas. The blocked particulate matter falls into the first impurity collection box 17 through the first impurity discharge pipe 16. The lower end of the connecting pipe 1 is fixedly installed with a second impurity discharge pipe 18 located to the left of the first filter plate 3. The lower end of the second impurity discharge pipe 18 is movably connected to a second impurity collection box 19. The flue gas after the first filtration by the second filter plate 4 enters the connecting pipe 1 and undergoes a second filtration by the first filter plate 3 inside the connecting pipe 1. The filtered particulate matter falls into the second impurity collection box 19 through the second impurity discharge pipe 18. Anti-slip rubber pads are fixedly installed at the connection between the second impurity collection box 19 and the second impurity discharge pipe 18, and at the connection between the first impurity discharge pipe 16 and the first impurity collection box 17.

[0030] like Figure 2 , Figure 5 and Figure 7 A side plate 20 is fixedly installed at the lower end of the output shaft of the electric push rod 7. A round rod 21 is fixedly connected to the end of the side plate 20 away from the electric push rod 7. An annular plate 22 is movably sleeved on the outer wall of the round rod 21 by fastening bolts 6. The right side of the annular plate 22 is fixedly connected to the left side of the scraper 5. By changing the connection method between the fastening bolts 6, the annular plate 22 and the round rod 21, the worn scraper 5 can be disassembled or a new scraper 5 can be installed.

[0031] Several heat exchange fins 23 are fixedly installed on both the front and back of the heat exchange bend 8. The end of the heat exchange fin 23 away from the heat exchange bend 8 is fixedly connected to the inner wall of the heat recovery box 9. A flue gas outlet pipe 24 is fixedly installed on the right end of the heat exchange bend 8. The flue gas in the heat exchange bend 8 enters the flue gas guide pipe 28 through the flue gas outlet pipe 24 and is then discharged into the interior of the water storage tank 10. At this time, the flue gas and water are fully mixed. The end of the flue gas outlet pipe 24 away from the heat exchange bend 8 is fixedly connected to the water storage tank 10. Inside the box 10, the flue gas duct 28 and the heat exchange bend 8 are fixedly installed with a flue gas inlet pipe 25 at the left end. The end of the flue gas inlet pipe 25 away from the heat exchange bend 8 is fixedly connected to the right end of the connecting pipe 1. The flue gas that has undergone secondary filtration enters the interior of the heat exchange bend 8 from the flue gas inlet pipe 25. Since the flue gas entering the heat exchange bend 8 has a certain amount of heat, it heats the water in the heat recovery box 9 by contacting the water through the heat exchange bend 8 and the heat exchange plate 23.

[0032] A first water inlet pipe 27 is fixedly installed on the upper left side of the heat recovery box 9. A first drain pipe 26 located below the first water inlet pipe 27 is fixedly connected to the left side of the heat recovery box 9. The bottom surface of the inner wall of the heat recovery box 9 is set as a slope with the left side lower than the right side.

[0033] A second water inlet pipe 29 is fixedly installed on the upper right side of the water storage tank 10. A second drain pipe 30 located below the second water inlet pipe 29 is fixedly connected to the right side of the water storage tank 10. The right side of the water storage tank 10 is fixedly connected to the water pump 11.

[0034] A water inlet pipe 31 is fixedly installed on the left end of the water pump 11, and the end of the water inlet pipe 31 away from the water pump 11 extends into the interior of the water storage tank 10. A filter screen located inside the water storage tank 10 is fixedly installed on the inner wall of the left end of the water inlet pipe 31. A water outlet pipe 32 is fixedly connected to the right end of the water pump 11, and the end of the water outlet pipe 32 away from the water pump 11 extends into the interior of the dust settling chamber 12 and then connects to the water outlet nozzle 13 pipe.

[0035] like Figure 3 and Figure 6A water inlet pipe 33 is fixedly installed at the upper end of the water nozzle 13, and the right side of the water inlet pipe 33 is fixedly connected to the upper end of the water outlet pipe 32. A support plate 34 is fixedly installed on the left side of the water inlet pipe 33, and the side of the support plate 34 away from the water inlet pipe 33 is fixedly connected to the inner wall of the dust settling chamber 12. When the power of the water pump 11 is turned on, the water in the water storage tank 10 is driven to flow. The water in the water storage tank 10 first passes through the filter screen installed at the water inlet pipe 31 and then enters the interior of the water outlet pipe 32 and the water inlet pipe 33 in sequence, and then is sprayed from the water nozzle 13 into the interior of the dust settling chamber 12, so that the gas and water in the dust settling chamber 12 are fully mixed. The mixture then falls into the interior of the water storage tank 10, so that the water in the water storage tank 10 is also recycled.

[0036] A first air inlet pipe 35 is fixedly installed on the right side of the first fan 14, and the end of the first air inlet pipe 35 away from the first fan 14 is fixedly connected to the upper end of the dust settling chamber 12. An activated carbon plate is installed at the connection between the first air inlet pipe 35 and the dust settling chamber 12. A first air outlet pipe 36 located in front of the second fan 15 is fixedly installed on the left side of the first fan 14, and the back of the first air outlet pipe 36 is connected to the pipe of the second fan 15. Driven by the first fan 14, the gas in the water storage tank 10 enters the interior of the first air inlet pipe 35 after being adsorbed by the activated carbon plate installed at the connection between the first air inlet pipe 35 and the dust settling chamber 12. A first mounting plate 37 is fixedly installed at the lower end of the first fan 14, and the right side of the first mounting plate 37 is fixedly connected to the left side of the dust settling chamber 12. The left end of the first air outlet pipe 36 extends into the boiler body.

[0037] The second fan 15 has a second air inlet pipe 38 fixedly installed on its front side, and the end of the second air inlet pipe 38 away from the second fan 15 extends into the interior of the first air outlet pipe 36. The second fan 15 has a second air outlet pipe 39 fixedly installed on its back side. When the second fan 15 is turned on, the air in the air enters the interior of the first air outlet pipe 36 through the interior of the second air outlet pipe 39 and the second air inlet pipe 38 in sequence, mixes with the treated exhaust gas, and is then sent into the interior of the boiler body, so that the exhaust gas of the boiler body can be recycled after treatment. The second fan 15 has a second mounting plate 40 fixedly installed at its lower end, and the right side of the second mounting plate 40 is fixedly connected to the left side of the dust settling chamber 12.

[0038] Working principle: During operation, the boiler body first generates flue gas during combustion. Since the pretreatment pipe 2 is connected to the flue gas outlet of the boiler body, the power to the first fan 14, the second fan 15, and the water pump 11 is turned on. After the first fan 14 is turned on, the flue gas in the boiler is drawn into the pretreatment pipe 2. The flue gas entering the pretreatment pipe 2 first passes through the second filter plate 4. The second filter plate 4 is designed to block particulate matter in the flue gas. The blocked particulate matter falls into the first impurity collection box 17 through the first impurity discharge pipe 16. The flue gas after the first filtration by the second filter plate 4 enters the connecting pipe 1 and undergoes a second filtration by the first filter plate 3 inside the connecting pipe 1. The filtered particulate matter falls from the second impurity discharge pipe 18 into the second impurity collection box 19. The flue gas, after secondary filtration, enters the heat exchanger bend 8 from the inlet pipe 25. Because the flue gas entering the heat exchanger bend 8 contains heat, it heats the water in the heat recovery box 9 through the contact between the heat exchanger bend 8 and the heat exchange plates 23. The flue gas in the heat exchanger bend 8 then enters the guide pipe 28 from the outlet pipe 24 and is discharged into the water storage tank 10. At this point, the flue gas and water are fully mixed. Driven by the first fan 14, the gas in the water storage tank 10 is adsorbed by the activated carbon plate installed at the connection between the first inlet pipe 35 and the dust settling chamber 12 before entering the first... Inside the air inlet duct 35, the second fan 15 draws air from the second outlet duct 39 and the second inlet duct 38 into the first outlet duct 36, where it mixes with the treated exhaust gas before being sent into the boiler body. This allows the treated exhaust gas to be recycled. Then, the gas entering the water storage tank 10, powered by the water pump 11, drives the water flow within the tank. The water in the tank first passes through the filter installed at the inlet duct 31, then sequentially enters the outlet duct 32 and the lead duct 33 before being sprayed from the water nozzle 13 into the dust settling chamber 12. This ensures thorough mixing of the gas and water in the dust settling chamber 12. The liquid then falls back into the water storage tank 10, allowing the water in the water storage tank 10 to be recycled. Finally, to prevent particulate matter in the flue gas from adhering to the first filter plate 3 and the second filter plate 4, the power of the electric push rods 7 on both sides is turned on. Using the extension and retraction of the output shaft inside the electric push rod 7, the scrapers 5 on both sides are driven to clean the second filter plate 4 and the first filter plate 3 through the connection of the side plate 20, the round rod 21, the fastening bolt 6 and the annular plate 22. This can scrape off the particulate matter adhering to the second filter plate 4 and the first filter plate 3. Furthermore, by changing the connection method between the fastening bolt 6 and the annular plate 22 and the round rod 21, the worn scraper 5 can be disassembled or a new scraper 5 can be installed.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boiler flue gas recirculation device, comprising a connecting pipe (1) and a boiler body, characterized in that: The left end flange of the connecting pipe (1) is connected to a pretreatment pipe (2), and the end of the pretreatment pipe (2) away from the connecting pipe (1) is connected to the flue gas outlet flange of the boiler body. A first filter plate (3) is fixedly installed on the inner wall of the connecting pipe (1), and a second filter plate (4) is fixedly sleeved on the inner wall of the pretreatment pipe (2). Scrapers (5) are provided on the left side of both the first filter plate (3) and the second filter plate (4). An electric push rod (7) is movably installed on the scraper (5) by fastening bolts (6). A heat exchange bend (8) is fixedly installed on the right end of the connecting pipe (1). A heat recovery box (9) is fixedly fitted to the outer wall. A water storage tank (10) is fixedly installed on the right side of the heat recovery box (9) through a pipe. A dust suppression chamber (12) is bolted to the upper end of the water storage tank (10). A water pump (11) is connected to the right side of the water storage tank (10) through a pipe. A number of water nozzles (13) located inside the dust suppression chamber (12) are connected to the end of the water pump (11) away from the water storage tank (10). A first fan (14) is fixedly installed at the upper end of the dust suppression chamber (12). A second fan (15) is fixedly connected to the rear of the first fan (14) through a pipe.

2. The boiler flue gas recirculation device according to claim 1, characterized in that: The lower end of the pretreatment tube (2) is fixedly installed with a first impurity discharge tube (16) located on the left side of the second filter plate (4). The lower end of the first impurity discharge tube (16) is movably connected to a first impurity collection box (17). The lower end of the connecting tube (1) is fixedly installed with a second impurity discharge tube (18) located on the left side of the first filter plate (3). The lower end of the second impurity discharge tube (18) is movably connected to a second impurity collection box (19). Anti-slip rubber pads are fixedly installed at the connection between the second impurity collection box (19) and the second impurity discharge tube (18) and at the connection between the first impurity discharge tube (16) and the first impurity collection box (17).

3. The boiler flue gas recirculation device according to claim 1, characterized in that: A side plate (20) is fixedly installed at the lower end of the output shaft of the electric push rod (7). A round rod (21) is fixedly connected to the end of the side plate (20) away from the electric push rod (7). An annular plate (22) is movably sleeved on the outer wall of the round rod (21) by fastening bolts (6), and the right side of the annular plate (22) is fixedly connected to the left side of the scraper (5).

4. The boiler flue gas recirculation device according to claim 1, characterized in that: Several heat exchange plates (23) are fixedly installed on both the front and back of the heat exchange bend (8), and the end of the heat exchange plate (23) away from the heat exchange bend (8) is fixedly connected to the inner wall of the heat recovery box (9). A flue pipe (24) is fixedly installed on the right end of the heat exchange bend (8), and a guide pipe (28) located inside the water storage tank (10) is fixedly connected to the end of the flue pipe (24) away from the heat exchange bend (8). A flue pipe (25) is fixedly installed on the left end of the heat exchange bend (8), and the end of the flue pipe (25) away from the heat exchange bend (8) is fixedly connected to the right end of the connecting pipe (1).

5. A boiler flue gas recirculation device according to claim 4, characterized in that: A first water inlet pipe (27) is fixedly installed on the upper left side of the heat recovery box (9), and a first drain pipe (26) located below the first water inlet pipe (27) is fixedly connected to the left side of the heat recovery box (9). The bottom surface of the inner wall of the heat recovery box (9) is set as a slope with the left side lower than the right side.

6. A boiler flue gas recirculation device according to claim 4, characterized in that: A second water inlet pipe (29) is fixedly installed on the upper right side of the water storage tank (10). A second drain pipe (30) located below the second water inlet pipe (29) is fixedly connected to the right side of the water storage tank (10). The right side of the water storage tank (10) is fixedly connected to the water pump (11).

7. A boiler flue gas recirculation device according to claim 6, characterized in that: The water pump (11) is fixedly installed with an inlet pipe (31) at its left end, and the end of the inlet pipe (31) away from the water pump (11) extends into the interior of the water storage tank (10). A filter screen located inside the water storage tank (10) is fixedly installed on the inner wall of the left end of the inlet pipe (31). The water pump (11) is fixedly connected with an outlet pipe (32) at its right end, and the end of the outlet pipe (32) away from the water pump (11) extends into the interior of the dust settling chamber (12) and then connects to the water outlet nozzle (13) pipe.

8. A boiler flue gas recirculation device according to claim 7, characterized in that: A water inlet pipe (33) is fixedly installed at the upper end of the water outlet nozzle (13), and the right side of the water inlet pipe (33) is fixedly connected to the upper end of the water outlet pipe (32). A support plate (34) is fixedly installed on the left side of the water inlet pipe (33), and the side of the support plate (34) away from the water inlet pipe (33) is fixedly connected to the inner wall of the dust settling chamber (12).

9. A boiler flue gas recirculation device according to claim 1, characterized in that: A first air inlet pipe (35) is fixedly installed on the right side of the first fan (14), and the end of the first air inlet pipe (35) away from the first fan (14) is fixedly connected to the upper end of the dust settling chamber (12). An activated carbon plate is installed at the connection between the first air inlet pipe (35) and the dust settling chamber (12). A first air outlet pipe (36) located in front of the second fan (15) is fixedly installed on the left side of the first fan (14), and the back of the first air outlet pipe (36) is connected to the pipe of the second fan (15). A first mounting plate (37) is fixedly installed at the lower end of the first fan (14), and the right side of the first mounting plate (37) is fixedly connected to the left side of the dust settling chamber (12). The left end of the first air outlet pipe (36) extends into the boiler body.

10. A boiler flue gas recirculation device according to claim 9, characterized in that: The second fan (15) is fixedly installed with a second air inlet pipe (38) on the front side, and the end of the second air inlet pipe (38) away from the second fan (15) extends into the interior of the first air outlet pipe (36). The second air outlet pipe (39) is fixedly installed on the back side of the second fan (15). The second mounting plate (40) is fixedly installed at the lower end of the second fan (15), and the right side of the second mounting plate (40) is fixedly connected to the left side of the dust settling chamber (12).

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