Energy-saving boiler with flue gas waste heat recovery mechanism

Abstract

The invention relates to an energy-saving boiler with a flue gas waste heat recovery mechanism, and belongs to the technical field of boilers, the energy-saving boiler comprises a boiler main body, a liquid discharge pipe is arranged at the bottom of the boiler main body, one end of the liquid discharge pipe is fixedly connected with a connector, a heat exchange box is arranged on one side of the boiler main body, a heat exchange cavity is formed in the heat exchange box, and the heat exchange cavity is communicated with the liquid discharge pipe. A blow-off pipe is detachably connected to the outer wall of the connector, a filter box is detachably connected to the outer wall of the blow-off pipe, and a storage cavity is formed in the heat exchange box. According to the heat exchange cavity and the storage cavity provided by the invention, under the action of the heat exchange aluminum pipe which is spirally arranged, cold water in the heat exchange aluminum pipe is heated by heat in sewage and is conveyed into the conversion cylinder for storage and conveying, and meanwhile, under continuous conveying of the sewage, through the arrangement of the filter box, the heat exchange efficiency is improved. And the filtered water is conveyed into the storage cavity for backup use, so that the effect of multi-path recycling of the sewage discharged by the boiler is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and in particular, to an energy-saving boiler with a flue gas waste heat recovery mechanism. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes the chemical energy in fuel and electric energy. The boiler outputs steam, high-temperature water or organic heat carriers with a certain amount of heat energy. The original meaning of "pot" refers to a water container heated on fire, and "furnace" refers to a place for burning fuel. A boiler includes two major parts: a pot and a furnace. The hot water or steam generated in the boiler can directly provide the required heat energy for industrial production and people's livelihood, or can be converted into mechanical energy through a steam power device, or further converted into electric energy through a generator. A boiler that provides hot water is called a hot water boiler, which is mainly used for life and has a small amount of application in industrial production.

[0003] In the prior art, an energy-saving and consumption-reducing boiler continuous blowdown waste heat recovery device with the publication number of CN211875990U specifically relates to the field of boiler blowdown, including a blowdown air hole pipe, and a waste heat recovery mechanism is fixedly installed on the outer wall of the circumferential side of the blowdown air hole pipe; the waste heat recovery mechanism includes a circumferential water pipe, the circumferential water pipe is fixedly installed on the outer wall of the circumferential side of the blowdown air hole pipe, a plurality of annular support frames are fixedly installed in the inner cavity of the circumferential water pipe, a water passing empty groove is opened inside each annular support frame, a fixed shaft rod is rotatably connected between every two corresponding annular support frames, and a spiral fan blade is fixedly installed on the outer wall of the circumferential side of the fixed shaft rod. By setting the waste heat recovery mechanism, the spiral fan blade drives the corresponding fixed shaft rod to rotate, and the problem that a large amount of heat is discharged simultaneously during the blowdown process of the boiler in the prior art, which is not conducive to energy conservation and consumption reduction, is solved.

[0004] However, when the existing boilers with waste heat recovery mechanisms are in use, although they can better recover and use the heat carried by the discharged hot sewage, they often directly recover and use the heat carried in the sewage. The multi-channel storage effect of the recovered hot water is not high, and when directly transporting the sewage, the filtering, recovery and storage effect of the sewage is not high, reducing the preheating effect on the inside of the boiler during subsequent startup of the boiler. And when recovering and transporting the hot water, the anti-counterflow effect of the hot water transportation is not high, easily causing water pressure deviation and reducing the continuity of the hot water transportation, affecting the efficiency of the boiler waste heat recovery and use, and not meeting people's usage requirements. Therefore, we propose an energy-saving boiler with a flue gas waste heat recovery mechanism. Summary of the Invention

[0005] To solve the problems mentioned in the above background, the present invention provides an energy-saving boiler with a flue gas waste heat recovery mechanism, so as to solve the problems that the multi-path storage effect of the recovered hot water is not high, and when directly transporting sewage, the filtering, recycling and storage effect of sewage is not high, reducing the preheating effect on the inside of the boiler during subsequent startup and the anti-backflow effect on hot water transportation, easily causing water pressure deviation, reducing the continuity of hot water transportation, and affecting the waste heat recovery and utilization efficiency of the boiler.

[0006] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows: An energy-saving boiler with a flue gas waste heat recovery mechanism, including a boiler main body. A drain pipe is arranged at the bottom of the boiler main body. One end of the drain pipe is fixedly connected with a connector. A heat exchange box is arranged on one side of the boiler main body. A heat exchange cavity is arranged inside the heat exchange box. The outer wall of the connector is detachably connected with a sewage discharge pipe. The outer wall of the sewage discharge pipe is detachably connected with a filter box. A storage cavity is arranged inside the heat exchange box. A guide plate is fixedly connected to the inner wall of the storage cavity. A first booster pump is fixedly connected to the outer wall of the heat exchange box. A first delivery pipe is fixedly connected to the outer wall of the first booster pump. One end of the first delivery pipe is fixedly connected with a conversion cylinder. An external water tank is arranged on the inner wall of the heat exchange cavity. The bottom of the external water tank is fixedly connected with a heat exchange aluminum pipe through a connection pump. One end of the heat exchange aluminum pipe is fixedly connected with a second booster pump. A second delivery pipe fixedly connected to the outer wall of the second booster pump and the outer wall of the conversion cylinder is fixedly connected. A storage cylinder is rotatably connected to the inner wall of the conversion cylinder. A connecting pipe is fixedly connected to the outer wall of the storage cylinder. An anti-backflow mechanism is arranged at one end of the connecting pipe. Under the action of the spirally arranged heat exchange aluminum pipe, the heat in the sewage heats the cold water in the heat exchange aluminum pipe and transports it to the conversion cylinder for storage and transportation. At the same time, under the continuous transportation of sewage, through the setting of the filter box, the filtered water is transported to the storage cavity for backup use, improving the effect of multi-path recovery and utilization of the sewage discharged from the boiler.

[0007] Preferably, the filter box is fixedly connected to the heat exchange box through an adapter pipe. The guide plate is arranged in an inclined state. Water pressure monitors are arranged on the outer walls of the first booster pump and the second booster pump.

[0008] Preferably, the heat exchange aluminum tube is arranged in a spiral shape on the outer wall of the sewage discharge pipe. The interior of the conversion cylinder is in a cavity shape. A first servo motor fixedly connected to the rotation center of the storage cylinder is fixedly connected to the top of the conversion cylinder. The inner wall of the storage cylinder is in a cavity shape. The connection parts of the outer wall of the storage cylinder with the first delivery pipe, the second delivery pipe, and the connection pipe are all provided with connection ports. After the water in the boiler is initially recycled, in order to improve the temporary storage effect of the unused hot water to meet the subsequent preheating effect of the interior of the boiler during the use of the boiler, after the hot water in the storage cylinder needs to be preheated and used, the first servo motor can be turned on to drive the storage cylinder to rotate on the inner wall of the conversion cylinder, so that the connection port corresponds to the connection pipe, and the hot water is transported into the boiler through the return pipe, achieving the effect of preheating the interior of the boiler when the boiler is started and used.

[0009] Preferably, an external spiral is provided on the outer wall of the sewage discharge pipe. An internal spiral is provided at the connection part of the inner wall of the connection head with the external spiral. An electric push rod is fixedly connected to the outer wall of the sewage discharge pipe. One end of the electric push rod is fixedly connected to a cleaning scraper that is slidably connected to the inner wall of the sewage discharge pipe.

[0010] Preferably, the anti-backflow mechanism includes a sealing baffle, a lifting cylinder, and a turning plate. An anti-backflow cylinder is detachably connected to the outer wall of the connection pipe. A delivery port is provided at the connection part of the top of the anti-backflow cylinder with the connection pipe. A sector block is fixedly connected to the inner wall of the anti-backflow cylinder. A telescopic rod is fixedly connected to the outer wall of the sector block. A spring fixedly connected to the outer wall of the sector block is sleeved on the outer wall of the telescopic rod. One end of the spring is fixedly connected to a sealing baffle fixedly connected to one end of the telescopic rod. A blocking ball is fixedly connected to the outer wall of the sealing baffle. A second servo motor is provided on the outer wall of the boiler main body. The output end of the second servo motor is fixedly connected to a threaded rod. A lifting block that is slidably connected to the outer wall of the boiler main body is threadedly connected to the outer wall of the threaded rod. A fixed cylinder is fixedly connected to the outer wall of the boiler main body. A lifting cylinder that is slidably connected to the inner wall of the fixed cylinder is fixedly connected to the outer wall of the lifting block. A connection cylinder is fixedly connected to the top of the lifting cylinder. When the recycled hot water is being used normally, in order to improve the anti-backflow effect of the heat during transportation, when the water pressure in the return pipe is less than the water pressure in the connection pipe, under the reaction of the spring being compressed, the sealing baffle and the blocking ball will perform a jacking movement, and the blocking ball will be inserted into the delivery port, playing a role in preventing the backflow transportation of the hot water.

[0011] Preferably, a connecting rod is fixedly connected to the outer wall of the lifting block, a connecting toothed plate is fixedly connected to the outer wall of the connecting rod, a connecting gear that is rotatably connected to the outer wall of the anti-backflow cylinder is engaged with the outer wall of the connecting toothed plate, the rotation center of the connecting gear is fixedly connected to a turning plate that is rotatably connected to the inner wall of the anti-backflow cylinder through a rotating shaft, a docking port is formed on the outer wall of the lifting cylinder, and a return pipe that is fixedly connected to the outer wall of the boiler body is fixedly connected to the outer wall of the fixed cylinder.

[0012] Preferably, the outer wall contour of the sealing baffle is larger than the inner wall contour of the conveying port, the outer wall contour of the sealing baffle is smaller than the inner wall contour of the anti-backflow cylinder, the outer wall contour of the blocking ball is smaller than the inner wall contour of the conveying port, and a pressure sensor is arranged on the outer wall of the sector block.

[0013] Preferably, the outer wall contour of the lifting cylinder is adaptively arranged with the inner wall contour of the fixed cylinder, the connecting gear forms a rotating structure with the anti-backflow cylinder through the connecting rod and the connecting toothed plate, and the connecting gears are symmetrically arranged about the central axis of the anti-backflow cylinder.

[0014] Preferably, the turning plate forms a turning structure with the anti-backflow cylinder through the connecting toothed plate and the connecting gear, and the return pipe is arranged on the movement track of the docking port.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The heat exchange cavity and the storage cavity provided in the present invention, under the action of the heat exchange aluminum tube arranged in a spiral shape, enable the heat in the sewage to heat the cold water in the heat exchange aluminum tube and convey it to the conversion cylinder for storage and conveyance. At the same time, under the continuous conveyance of the sewage, through the setting of the filter box, the filtered water is conveyed to the storage cavity for backup use, improving the effect of multi-channel recycling of the sewage discharged from the boiler.

[0016] 2. Through the setting of the storage cylinder in the present invention, after initially recycling the water of the boiler, in order to improve the temporary storage effect of the unused hot water to meet the preheating effect of the interior of the boiler during subsequent use of the boiler, when it is necessary to preheat and use the hot water in the storage cylinder, the first servo motor can be turned on to drive the storage cylinder to rotate on the inner wall of the conversion cylinder, so that the connection port corresponds to the connecting pipe, and the hot water is conveyed to the boiler through the return pipe, achieving the effect of preheating the interior of the boiler when the boiler is started.

[0017] 3. The sealing baffle and the turning plate provided in the present invention, when the recovered hot water is used normally, in order to improve the anti-backflow effect of the heat during conveyance, when the water pressure in the return pipe is less than the water pressure in the connecting pipe, under the reaction force of the compressed spring, the sealing baffle and the blocking ball will perform a jacking movement, and the blocking ball will be inserted into the conveying port, playing a role in preventing the backflow conveyance of the hot water. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic front view structure diagram of the overall structure of the present invention; Figure 3 is a schematic diagram of the internal structure of the heat exchange box of the present invention; Figure 4 is a schematic diagram of the position distribution structure of the guide plate of the present invention; Figure 5 is a schematic diagram of the position distribution structure of the cleaning scraper of the present invention; Figure 6 is a schematic diagram of the position distribution structure of the sealing baffle of the present invention; Figure 7 is a schematic diagram of the structure of the flip plate of the present invention; Figure 8 is a schematic diagram of the position distribution structure of the storage cylinder of the present invention.

[0019] The reference numerals in the drawings are: 1, boiler main body; 2, drain pipe; 3, connector; 4, heat exchange box; 5, heat exchange cavity; 6, sewage discharge pipe; 7, filter box; 8, storage cavity; 9, guide plate; 10, first booster pump; 11, first delivery pipe; 12, conversion cylinder; 13, external water tank; 14, heat exchange aluminum pipe; 15, second booster pump; 16, second delivery pipe; 17, first servo motor; 18, storage cylinder; 19, connecting pipe; 20, outer helix; 21, inner helix; 22, electric push rod; 23, cleaning scraper; 24, anti-backflow mechanism; 2401, anti-backflow cylinder; 2402, delivery port; 2403, sector block; 2404, telescopic rod; 2405, spring; 2406, sealing baffle; 2407, blocking ball; 2408, second servo motor; 2409, threaded rod; 2410, lifting block; 2411, fixed cylinder; 2412, lifting cylinder; 2413, connecting cylinder; 2414, connecting rod; 2415, connecting toothed plate; 2416, connecting gear; 2417, flip plate; 2418, docking port; 25, return pipe. Detailed implementation manners

[0020] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines the drawings and preferred embodiments to detail the specific implementation manners, structures, features and their effects of the present invention as follows.

[0021] Embodiment 1: Please refer to Figures 1 to 8, this embodiment provides an energy-saving boiler with a flue gas waste heat recovery mechanism, including a boiler main body 1. A drain pipe 2 is arranged at the bottom of the boiler main body 1. One end of the drain pipe 2 is fixedly connected with a connector 3. A heat exchange box 4 is arranged on one side of the boiler main body 1. A heat exchange cavity 5 is arranged inside the heat exchange box 4. The outer wall of the connector 3 is detachably connected with a sewage discharge pipe 6. The outer wall of the sewage discharge pipe 6 is detachably connected with a filter box 7. A storage cavity 8 is arranged inside the heat exchange box 4. A guide plate 9 is fixedly connected to the inner wall of the storage cavity 8. A first booster pump 10 is fixedly connected to the outer wall of the heat exchange box 4. A first delivery pipe 11 is fixedly connected to the outer wall of the first booster pump 10. One end of the first delivery pipe 11 is fixedly connected with a conversion cylinder 12. An external water tank 13 is arranged on the inner wall of the heat exchange cavity 5. The bottom of the external water tank 13 is fixedly connected with a heat exchange aluminum pipe 14 through a connection pump. One end of the heat exchange aluminum pipe 14 is fixedly connected with a second booster pump 15. A second delivery pipe 16 fixedly connected to the outer wall of the second booster pump 15 is fixedly connected to the outer wall of the conversion cylinder 12. A storage cylinder 18 is rotatably connected to the inner wall of the conversion cylinder 12. A connecting pipe 19 is fixedly connected to the outer wall of the storage cylinder 18. An anti-backflow mechanism 24 is arranged at one end of the connecting pipe 19.

[0022] As Figure 3 shown, the filter box 7 is fixedly connected to the heat exchange box 4 through an adapter pipe. The guide plate 9 is arranged in an inclined state. Water pressure monitors are arranged on the outer walls of the first booster pump 10 and the second booster pump 15, which is beneficial to the fixed connection between the filter box 7 and the heat exchange box 4 through the adapter pipe, playing a role in filtering the sewage and keeping the heat for continued storage and use.

[0023] As Figure 3 shown, the heat exchange aluminum pipe 14 is arranged in a spiral shape on the outer wall of the sewage discharge pipe 6. The inside of the conversion cylinder 12 is in a cavity shape. A first servo motor 17 fixedly connected to the rotation center of the storage cylinder 18 is fixedly connected to the top of the conversion cylinder 12. The inside of the storage cylinder 18 is in a cavity shape. Connection ports are provided at the connection parts of the outer wall of the storage cylinder 18 with the first delivery pipe 11, the second delivery pipe 16 and the connecting pipe 19, which is beneficial to the spiral arrangement of the heat exchange aluminum pipe 14 on the outer wall of the sewage discharge pipe 6, playing a role in increasing the heat exchange area of the sewage, achieving the effect of improving the heat recovery and use, and being beneficial to the temporary storage of the recovered hot water due to the cavity shape of the inner wall of the storage cylinder 18.

[0024] As Figure 5As shown in the figure, an external spiral 20 is provided on the outer wall of the sewage discharge pipe 6, and an internal spiral 21 is provided at the connection part between the inner wall of the connector 3 and the external spiral 20. An electric push rod 22 is fixedly connected to the outer wall of the sewage discharge pipe 6, and one end of the electric push rod 22 is fixedly connected to a cleaning scraper 23 that is slidably connected to the inner wall of the sewage discharge pipe 6. The setting of the external spiral 20 on the outer wall of the sewage discharge pipe 6 is beneficial for regularly disassembling and repairing the sewage discharge pipe 6, and the setting of the cleaning scraper 23 is beneficial for automatically scraping and cleaning the impurities adsorbed on the inner wall of the sewage discharge pipe 6.

[0025] As Figure 6 and 7 shown in the figure, the anti-backflow mechanism 24 includes a sealing baffle 2406, a lifting cylinder 2412, and a turning plate 2417. An anti-backflow cylinder 2401 is detachably connected to the outer wall of the connecting pipe 19. A delivery port 2402 is provided at the connection part between the top of the anti-backflow cylinder 2401 and the connecting pipe 19. A sector block 2403 is fixedly connected to the inner wall of the anti-backflow cylinder 2401. A telescopic rod 2404 is fixedly connected to the outer wall of the sector block 2403. A spring 2405 that is fixedly connected to the outer wall of the sector block 2403 is sleeved on the outer wall of the telescopic rod 2404. One end of the spring 2405 is fixedly connected to a sealing baffle 2406 that is fixedly connected to one end of the telescopic rod 2404. A blocking ball 2407 is fixedly connected to the outer wall of the sealing baffle 2406. A second servo motor 2408 is provided on the outer wall of the boiler main body 1. The output end of the second servo motor 2408 is fixedly connected to a threaded rod 2409. A lifting block 2410 that is slidably connected to the outer wall of the boiler main body 1 is threadedly connected to the outer wall of the threaded rod 2409. A fixed cylinder 2411 is fixedly connected to the outer wall of the boiler main body 1. A lifting cylinder 2412 that is slidably connected to the inner wall of the fixed cylinder 2411 is fixedly connected to the outer wall of the lifting block 2410. A connecting cylinder 2413 is fixedly connected to the top of the lifting cylinder 2412. By providing the sealing baffle 2406 and the turning plate 2417, when the recycled hot water is used normally, in order to improve the anti-backflow effect of heat during transportation, when the water pressure in the return pipe 25 is less than the water pressure in the connecting pipe 19, under the reaction force of the spring 2405 being compressed, the sealing baffle 2406 and the blocking ball 2407 will perform a jacking movement, and the blocking ball 2407 will be inserted into the delivery port 2402, playing a role in preventing the backflow transportation of hot water.

[0026] As Figures 6 - 7As shown, the outer wall contour of the sealing baffle 2406 is larger than the inner wall contour of the conveying port 2402, the outer wall contour of the sealing baffle 2406 is smaller than the inner wall contour of the anti-backflow cylinder 2401, the outer wall contour of the blocking ball 2407 is smaller than the inner wall contour of the conveying port 2402, and a pressure sensor is arranged on the outer wall of the sector block 2403. The arrangement that the outer wall contour of the sealing baffle 2406 is larger than the inner wall contour of the conveying port 2402 is conducive to driving the blocking ball 2407 to insert into the conveying port 2402, playing a role in preventing the backflow of hot water during transportation.

[0027] As Figure 6 and Figure 7 As shown, the outer wall contour of the lifting cylinder 2412 is adaptively arranged with the inner wall contour of the fixed cylinder 2411. The connecting gear 2416 forms a rotating structure with the anti-backflow cylinder 2401 through the connecting rod 2414 and the connecting tooth plate 2415. The connecting gear 2416 is symmetrically arranged about the central axis of the anti-backflow cylinder 2401. The sliding of the connecting rod 2414 through the connection of the connecting tooth plate 2415 is conducive to driving the connecting gear 2416 to rotate along the outer wall of the anti-backflow cylinder 2401, playing a role in synchronously adjusting the rotation state of the flip plate 2417.

[0028] As Figure 7 As shown, the flip plate 2417 forms a flipping structure with the anti-backflow cylinder 2401 through the connecting tooth plate 2415 and the connecting gear 2416. The return pipe 25 is arranged on the movement track of the docking port 2418. The sliding of the connecting tooth plate 2415 through the connection of the connecting gear 2416 is conducive to driving the flip plate 2417 to flip along the inner wall of the anti-backflow cylinder 2401, playing a role in preventing the backflow of hot water during transportation.

[0029] Working principle: As Figures 1 - 8 As shown, when the boiler with the effect of waste heat recovery is in use, first, under the action of the heat exchange aluminum tube 14 arranged in a spiral shape, the heat in the sewage heats the cold water in the heat exchange aluminum tube 14 and conveys it to the conversion cylinder 12 for storage and transportation. At the same time, under the continuous transportation of the sewage, through the setting of the filter box 7, the filtered water is conveyed to the storage cavity 8 for backup use, improving the effect of multi-channel recovery and use of the sewage discharged from the boiler; Next, after the initial recovery and use of the water in the boiler, in order to improve the temporary storage effect of the unused hot water to meet the preheating effect of the boiler interior during subsequent boiler use, after the hot water in the storage cylinder 18 needs to be preheated and used, the first servo motor 17 can be turned on to drive the storage cylinder 18 to rotate on the inner wall of the conversion cylinder 12, making the docking interface correspond to the connecting pipe 19, so that the hot water is conveyed to the boiler through the return pipe 25, achieving the effect of preheating the boiler interior when the boiler is started. Next, when the recycled hot water is used normally, in order to improve the anti-backflow effect of heat during transportation, when the water pressure in the return pipe 25 is less than the water pressure in the connecting pipe 19, under the reaction of the spring 2405 being squeezed, the sealing baffle 2406 and the blocking ball 2407 will perform a jacking motion, and the blocking ball 2407 will be inserted into the delivery port 2402, playing a role in preventing the backflow of hot water during transportation. Finally, when the anti-backflow cylinder 2401 needs to be used normally, the second servo motor 2408 can drive the lifting cylinder 2412 fixedly connected to the lifting block 2410 to slide along the inner wall of the fixed cylinder 2411 through the rotation of the threaded rod 2409, and drive the connecting cylinder 2413 to move upward along the inner wall of the anti-backflow cylinder 2401. At the same time, the docking port 2418 is communicated with the return pipe 25, and under the connection of the connecting rod 2414, the connecting gear 2416 meshing with the connecting toothed plate 2415 is driven to perform a rotational motion, so that the turning plate 2417 performs a turning motion on the inner wall of the anti-backflow cylinder 2401, and the turning plate 2417 is simultaneously opened, playing a role in the communication and transportation between the anti-backflow cylinder 2401 and the return pipe 25.

[0030] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content without departing from the technical solution of the present invention. However, any brief modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An energy-saving boiler with a flue gas waste heat recovery mechanism, comprising a boiler main body (1), characterized in that: A drain pipe (2) is provided at the bottom of the boiler body (1). One end of the drain pipe (2) is fixedly connected to a connector (3). A heat exchange box (4) is provided on one side of the boiler body (1). A heat exchange cavity (5) is provided inside the heat exchange box (4). The outer wall of the connector (3) is detachably connected to a sewage discharge pipe (6). The outer wall of the sewage discharge pipe (6) is detachably connected to a filter box (7). A storage cavity (8) is provided inside the heat exchange box (4). A guide plate (9) is fixedly connected to the inner wall of the storage cavity (8). A first booster pump (10) is fixedly connected to the outer wall of the heat exchange box (4). A first delivery pipe (11) is fixedly connected to the outer wall of the first booster pump (10). One end of the first delivery pipe (11) is fixedly connected to a conversion cylinder (12). An external water tank (13) is provided on the inner wall of the heat exchange cavity (5). The bottom of the external water tank (13) is fixedly connected to a heat exchange aluminum pipe (14) through a connection pump. One end of the heat exchange aluminum pipe (14) is fixedly connected to a second booster pump (15). A second delivery pipe (16) fixedly connected to the outer wall of the second booster pump (15) and the outer wall of the conversion cylinder (12) is provided. A storage cylinder (18) is rotatably connected to the inner wall of the conversion cylinder (12). A connection pipe (19) is fixedly connected to the outer wall of the storage cylinder (18). An anti-backflow mechanism (24) is provided at one end of the connection pipe (19).

2. The energy-saving boiler with a flue gas waste heat recovery mechanism according to claim 1, wherein: The filter box (7) is fixedly connected to the heat exchange box (4) through a connecting pipe. The guide plate (9) is arranged in an inclined state. Water pressure monitors are provided on the outer walls of the first booster pump (10) and the second booster pump (15).

3. An energy-saving boiler with a flue gas waste heat recovery mechanism according to claim 1, characterized in that: The heat exchange aluminum pipe (14) is arranged in a spiral shape on the outer wall of the sewage discharge pipe (6). The inside of the conversion cylinder (12) is in a cavity shape. A first servo motor (17) fixedly connected to the rotation center of the storage cylinder (18) is fixedly connected to the top of the conversion cylinder (12). The inside of the storage cylinder (18) is in a cavity shape. Connection ports are provided at the connection parts of the outer wall of the storage cylinder (18) with the first delivery pipe (11), the second delivery pipe (16) and the connection pipe (19).

4. An energy-saving boiler with a flue gas waste heat recovery mechanism according to claim 1, characterized in that: An external spiral (20) is provided on the outer wall of the sewage discharge pipe (6). An internal spiral (21) is provided at the connection part of the inner wall of the connector (3) and the external spiral (20). An electric push rod (22) is fixedly connected to the outer wall of the sewage discharge pipe (6). A cleaning scraper (23) slidably connected to the inner wall of the sewage discharge pipe (6) is fixedly connected to one end of the electric push rod (22).

5. An energy-saving boiler with a flue gas waste heat recovery mechanism according to claim 1, characterized in that: The anti-backflow mechanism (24) includes a sealing baffle (2406), a lifting cylinder (2412) and a turning plate (2417). The outer wall of the connecting pipe (19) is detachably connected with an anti-backflow cylinder (2401). A conveying port (2402) is formed at the connecting part of the top of the anti-backflow cylinder (2401) and the connecting pipe (19). A sector block (2403) is fixedly connected to the inner wall of the anti-backflow cylinder (2401). An expansion rod (2404) is fixedly connected to the outer wall of the sector block (2403). A spring (2405) fixedly connected to the outer wall of the sector block (2403) is sleeved on the outer wall of the expansion rod (2404). One end of the spring (2405) is fixedly connected with a sealing baffle (2406) fixedly connected to one end of the expansion rod (2404). A blocking ball (2407) is fixedly connected to the outer wall of the sealing baffle (2406). A second servo motor (2408) is arranged on the outer wall of the boiler main body (1). The output end of the second servo motor (2408) is fixedly connected with a threaded rod (2409). A lifting block (2410) slidably connected to the outer wall of the boiler main body (1) is threadedly connected to the outer wall of the threaded rod (2409). A fixed cylinder (2411) is fixedly connected to the outer wall of the boiler main body (1). A lifting cylinder (2412) slidably connected to the inner wall of the fixed cylinder (2411) is fixedly connected to the outer wall of the lifting block (2410). A connecting cylinder (2413) is fixedly connected to the top of the lifting cylinder (2412).

6. The energy-saving boiler with a flue gas waste heat recovery mechanism according to claim 5, wherein: A connecting rod (2414) is fixedly connected to the outer wall of the lifting block (2410). A connecting toothed plate (2415) is fixedly connected to the outer wall of the connecting rod (2414). A connecting gear (2416) rotatably connected to the outer wall of the anti-backflow cylinder (2401) is meshed with the outer wall of the connecting toothed plate (2415). A turning plate (2417) rotatably connected to the inner wall of the anti-backflow cylinder (2401) is fixedly connected to the rotation center of the connecting gear (2416) through a rotating shaft. A docking port (2418) is formed on the outer wall of the lifting cylinder (2412). A return pipe (25) fixedly connected to the outer wall of the boiler main body (1) is fixedly connected to the outer wall of the fixed cylinder (2411).

7. An energy-saving boiler with a flue gas waste heat recovery mechanism according to claim 5, characterized in that: The outer wall contour of the sealing baffle (2406) is larger than the inner wall contour of the conveying port (2402), the outer wall contour of the sealing baffle (2406) is smaller than the inner wall contour of the anti-backflow cylinder (2401), the outer wall contour of the blocking ball (2407) is smaller than the inner wall contour of the conveying port (2402), and a pressure sensor is arranged on the outer wall of the sector block (2403).

8. An energy-saving boiler with a flue gas waste heat recovery mechanism according to claim 6, characterized in that: The outer wall contour of the lifting cylinder (2412) is adaptively arranged with the inner wall contour of the fixed cylinder (2411). The connecting gear (2416) forms a rotating structure with the anti-backflow cylinder (2401) through the connecting rod (2414) and the connecting toothed plate (2415). The connecting gear (2416) is symmetrically arranged about the central axis of the anti-backflow cylinder (2401).

9. The energy-saving boiler with a flue gas waste heat recovery mechanism according to claim 6, characterized in that: The turning plate (2417) forms a turning structure with the anti-backflow cylinder (2401) through a connecting tooth plate (2415) and a connecting gear (2416), and the return pipe (25) is arranged on the movement track of the docking port (2418).

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