Efficient heat energy recovery device for boiler flue

Abstract

The invention relates to the technical field of boiler heat energy recovery, in particular to an efficient heat energy recovery device for a boiler flue, the flue is provided with an air inlet section and an air outlet section, and the number of the heat energy recovery devices is at least two. The heat energy recovery device comprises a drainage pipe, an air heat exchanger is arranged in the drainage pipe, and the air heat exchanger is connected with an air inlet of the boiler; the first electromagnetic valve at the air inlet of the drainage pipe is opened, after high-temperature flue gas is injected into the drainage pipe, the first electromagnetic valve at the air inlet of the drainage pipe and the second electromagnetic valve at the air outlet of the drainage pipe are closed, and at the moment, the circulation channel is formed in the drainage pipe; due to the fact that heat of high-temperature flue gas is absorbed under the action of the air heat exchanger, circulating flow of the flue gas is formed according to the principle that hot air ascends and cold air descends, and heat in the flue gas is rapidly absorbed to the maximum extent.

Description

Technical Field

[0001] This invention relates to the field of boiler heat recovery technology, specifically to a high-efficiency heat recovery device for boiler flue. Background Technology

[0002] A boiler heat recovery unit, also known as a boiler waste heat recovery system or waste heat recovery boiler, refers to a device that captures and recovers the heat energy from the exhaust gas emitted by a boiler, allowing this heat energy to be reused. Its purpose is to improve energy efficiency, reduce energy consumption, lower pollution emissions, and help businesses save on energy costs. The waste heat recovery unit can convert the heat from the boiler's exhaust gas into usable heat energy for reuse.

[0003] Chinese Patent CN202123331210.3 discloses a device for cooling circulating water using waste heat from boiler flues. The device includes a main flue, with a boiler fixedly connected to its bottom. Two water tanks are fixedly fitted onto the outer surface of the main flue. In this device, waste heat from branch flues heats the water in the tanks, achieving waste heat recovery. Through the cooperation of a limiting cylinder assembly, a collar, a stirring plate, and a heat-conducting wire, the water flows from left to right, constantly rotating the stirring plate and ensuring a uniform internal temperature of the water. This allows for the even recovery of waste heat from the branch flues. The two water tanks ensure sufficient recovery of waste heat from the main flue, preventing heat loss. The heat sinks ensure effective cooling and improve heat exchange efficiency. The insulation rings prevent unrecovered waste heat from the main flue from escaping.

[0004] The aforementioned patent recovers heat energy by absorbing heat from the flue gas passing through it. However, the flue gas passes through the flue very quickly, which means that the heat inside the flue gas may not be fully collected before it passes through this section of the flue, resulting in the incomplete recovery and utilization of heat energy. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a high-efficiency heat recovery device for boiler flue gas, so as to solve the technical problem that the heat inside the flue gas passes through the flue gas section before it is fully collected, resulting in the inability to fully recover and utilize the heat energy.

[0006] To achieve the above objectives, the present invention provides a high-efficiency heat recovery device for boiler flue. The flue has an inlet section and an outlet section. There are at least two heat recovery devices. The inlets of the two heat recovery devices are connected to the inlet section of the flue, and the outlets of the two heat recovery devices are connected to the outlet section of the flue. The heat recovery device includes a diversion pipe, the inlet and outlet of which are connected to the inlet and outlet sections of the flue, respectively. A first solenoid valve is installed at the inlet of the diversion pipe, and a second solenoid valve is installed at the outlet of the diversion pipe. An air heat exchanger is installed inside the diversion pipe and is connected to the inlet of the boiler. A return pipe is provided on the drainage pipe to form a circulation channel inside the drainage pipe, and the air heat exchanger is located in the circulation channel.

[0007] Preferably, a third solenoid valve is provided at one end of the return pipe, and the third solenoid valve is located at the end of the return pipe near the air inlet of the guide pipe. The reflux pipe is equipped with a gas drive mechanism to control the gas flow.

[0008] Preferably, the gas drive mechanism includes a mounting frame, which is fixedly installed inside the return pipe; An impeller, which is mounted on a fixed frame and is rotatably connected to the fixed frame; A connecting rod passes through the return pipe and is rotatably and sealedly connected to the return pipe. A first bevel gear is provided at one end of the connecting rod, and a second bevel gear is provided at the impeller shaft. The first bevel gear and the second bevel gear mesh with each other. The first servo motor is mounted outside the return pipe, and its output end is connected to the connecting rod via a synchronous pulley set.

[0009] Preferably, a filter cloth is provided at the air inlet of the diversion pipe, the filter cloth is located below the first solenoid valve, and the filter cloth is higher than the connection point between the diversion pipe and the flue air inlet section.

[0010] Preferably, the filter cloth is made of glass fiber.

[0011] Preferably, the return pipe is also provided with a spray pipe, one end of which is connected to the inside of the return pipe and the other end of which is connected to the drainage pipe, and the connection point is located between the first solenoid valve and the filter cloth. A fourth solenoid valve is installed at the connection between the injection pipe and the drainage pipe.

[0012] Preferably, a fifth solenoid valve is installed inside the diversion pipe, and the fifth solenoid valve is located at the connection point between the diversion pipe and the flue gas inlet section; The drain pipe is also equipped with a baffle, which is located between the filter cloth and the fifth solenoid valve. The baffle can connect or close the drain pipe and the flue.

[0013] Preferably, the heat recovery device further includes a rotary driver, which includes a second servo motor. The second servo motor is mounted outside the drain pipe, and the output shaft of the second servo motor is provided with a first gear. A rotating shaft is provided on one side of the baffle, and the baffle is rotatably connected to the side wall of the drainage pipe through the rotating shaft. A second gear is provided at the rotating shaft of the baffle, and the first gear meshes with the second gear.

[0014] Preferably, the side wall of the drainage tube is provided with a dust outlet, which is connected to the inside of the drainage tube and is located between the filter cloth and the baffle.

[0015] Preferably, a cover is provided at the dust outlet, and the cover is hinged to the outer wall of the drain pipe; A cylinder is installed on the outside of the drainage tube. The fixed end of the cylinder is hinged to the outer wall of the drainage tube, and the output end of the cylinder is hinged to the cover.

[0016] The beneficial effects of this invention are: 1. In this invention, the first solenoid valve at the air inlet of the diversion pipe is opened. After the high-temperature flue gas is injected into the diversion pipe, the first and second solenoid valves at the air inlet and outlet of the diversion pipe are closed. At this time, a circulation channel is formed in the diversion pipe. Due to the action of the air heat exchanger, the high-temperature flue gas absorbs heat. Based on the principle of hot air rising and cold air falling, the flue gas will circulate, maximizing the rapid absorption of heat in the flue gas. The process of heat recovery from high-temperature flue gas by the first heat recovery device requires a certain amount of time to complete. That is, after the high-temperature flue gas is injected into the inlet pipe of the first heat recovery device, when the first and second solenoid valves of the inlet and outlet of the inlet pipe are closed, the second heat recovery device will open and alternate during this time interval. By alternating the action of the two sets of heat recovery devices, the blockage in the heat recovery process is avoided, and the smoothness and efficiency of the process are improved. 2. The heat exchange rate of an air heat exchanger can be improved by installing a gas-driven mechanism inside the return pipe; Before the high-temperature flue gas is injected into the diversion pipe, the third solenoid valve is closed. After the high-temperature flue gas is injected into the diversion pipe, the first and second solenoid valves at the inlet and outlet of the diversion pipe are closed. At this time, a circulation channel is formed in the diversion pipe, and the gas drive mechanism starts to work. The output end of the first servo motor drives the connecting rod to rotate through the synchronous belt pulley group. The connecting rod drives the first bevel gear to rotate. Since the first bevel gear meshes with the second bevel gear, the connecting rod will drive the second bevel gear to rotate through the first bevel gear. The rotation of the second bevel gear will eventually drive the impeller to rotate. At this time, the third solenoid valve will be in the open state. Under the rotation of the impeller, the high-temperature flue gas in the circulation channel will form a circulation flow, which further improves the heat exchange rate of the air heat exchanger.

[0017] 3. After the filter cloth has been used for a long time, it will become clogged and the gas throughput will continue to decrease. At this time, the first solenoid valve, the third solenoid valve and the fifth solenoid valve need to be closed. The output shaft of the second servo motor of the rotary driver drives the first gear to rotate. The first gear drives the baffle to rotate through the second gear, so that the baffle is in a horizontal state. The gas drive mechanism is activated to deliver gas to the space between the first solenoid valve and the filter cloth. After the gas is filled, a large number of dust particles stuck under the filter cloth will fall to the top of the baffle. The cover is opened by a cylinder, and then the rotary actuator controls the baffle to return to its tilted state. The lowest point of the baffle tilts towards the dust outlet, and the dust particles on the baffle will be discharged through the dust outlet. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a side view of the present invention; Figure 4 for Figure 3 A sectional view along the AA direction; Figure 5 for Figure 4 A schematic diagram of the baffle in its closed state; Figure 6 This is a schematic diagram of the internal structure of the reflux pipe of the present invention; Figure 7 This is a partial structural diagram of the present invention. Figure 1 ; Figure 8 This is a partial structural diagram of the present invention. Figure 2 .

[0020] The numbers on the map are: 1-Fluorite; 11-Inlet section; 12-Outlet section; 13-Drain pipe; 131-First solenoid valve; 132-Second solenoid valve; 2-Return pipe; 21-Third solenoid valve; 22-Gas drive mechanism; 221-Fixed frame; 222-Impeller; 2221-Second bevel gear; 223-Connecting rod; 2231-First bevel gear; 224-First servo motor; 225-Synchronous belt pulley set; 23-Injection pipe; 231-Fourth solenoid valve; 3-Air heat exchanger; 4-Filter cloth; 5-Baffle; 51-Second servo motor; 52-First gear; 53-Second gear; 6-Fifth solenoid valve; 7-Cylinder; 71-Cylinder. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] In a first aspect, the present invention provides a high-efficiency heat recovery device for boiler flue 1, such as... Figures 1 to 5 As shown, flue 1 has an air inlet section 11 and an air outlet section 12. There are at least two heat recovery devices. The air inlets of the two heat recovery devices are connected to the air inlet section 11 of flue 1, and the air outlets of the two heat recovery devices are connected to the air outlet section 12 of flue 1. The heat recovery device includes a diversion pipe 13, the inlet and outlet of the diversion pipe 13 are connected to the inlet section 11 and outlet section 12 of the flue 1 respectively, the inlet of the diversion pipe 13 is equipped with a first solenoid valve 131, the outlet of the diversion pipe 13 is equipped with a second solenoid valve 132, and an air heat exchanger 3 is installed inside the diversion pipe 13, which is connected to the inlet of the boiler. A return pipe 2 is provided on the drainage pipe 13 so that a circulation channel is formed inside the drainage pipe 13, and the air heat exchanger 3 is located in the circulation channel.

[0024] In this embodiment, flue gas is transported through boiler flue 1, and the flue gas is transported through the air inlet section 11 of flue 1. In this solution, there are two heat recovery devices, and the two heat recovery devices need to be used alternately. The specific process of using the heat recovery device is as follows: the first solenoid valve 131 at the air inlet of the diversion pipe 13 is opened. After the high-temperature flue gas is injected into the diversion pipe 13, the first solenoid valve 131 and the second solenoid valve 132 at the air inlet and outlet of the diversion pipe 13 are closed. At this time, a circulation channel is formed in the diversion pipe 13. Due to the action of the air heat exchanger 3, the high-temperature flue gas absorbs heat. According to the principle of hot air rising and cold air falling, the flue gas will circulate and the heat in the flue gas will be absorbed quickly to the maximum extent. The main function of the air heat exchanger 3 is to recover heat from the exhaust gas and transfer this heat to the air entering the boiler in order to improve combustion efficiency and reduce energy consumption. The process of heat recovery from high-temperature flue gas by the aforementioned heat recovery device requires a certain amount of time to complete. That is, after the high-temperature flue gas is injected into the inlet pipe 13 of the heat recovery device, when the first solenoid valve 131 and the second solenoid valve 132 at the inlet and outlet of the inlet pipe 13 are closed, the second heat recovery device will open alternately during this time interval. Through the alternating action of the two sets of heat recovery devices, the interruption in the heat recovery process is avoided, and the smoothness and efficiency of the process are improved.

[0025] As one implementation method, such as Figures 3 to 6 As shown, further details are as follows: A third solenoid valve 21 is provided at one end of the return pipe 2, and the third solenoid valve 21 is located at the end of the return pipe 2 near the air inlet of the guide pipe 13. The return pipe 2 is equipped with a gas drive mechanism 22 for controlling gas flow.

[0026] The gas drive mechanism 22 includes a fixing frame 221, which is fixedly installed inside the return pipe 2; Impeller 222, which is mounted on the fixed frame 221 and is rotatably connected to the fixed frame 221; A connecting rod 223 passes through the return pipe 2 and is rotatably and sealingly connected to the return pipe 2. A first bevel gear 2231 is provided at one end of the connecting rod 223, and a second bevel gear 2221 is provided at the wheel shaft of the impeller 222. The first bevel gear 2231 and the second bevel gear 2221 mesh with each other. The first servo motor 224 is installed outside the return pipe 2, and the output end of the first servo motor 224 is connected to the connecting rod 223 through the synchronous pulley group 225.

[0027] In this embodiment, the heat exchange rate of the air heat exchanger 3 can be improved by setting a gas drive mechanism 22 inside the return pipe 2. Before the high-temperature flue gas is injected into the diversion pipe 13, the third solenoid valve 21 is closed. After the high-temperature flue gas is injected into the diversion pipe 13, the first solenoid valve 131 and the second solenoid valve 132 at the inlet and outlet of the diversion pipe 13 are closed. At this time, a circulation channel is formed in the diversion pipe 13, and the gas drive mechanism 22 starts to work. The output end of the first servo motor 224 drives the connecting rod 223 to rotate through the synchronous belt pulley group 225. The connecting rod 223 drives the first bevel gear 2231 to rotate. Since the first bevel gear 2231 meshes with the second bevel gear 2221, the connecting rod 223 will drive the second bevel gear 2221 to rotate through the first bevel gear 2231. The rotation of the second bevel gear 2221 will eventually drive the impeller 222 to rotate. At this time, the third solenoid valve 21 will be in the open state. At this time, under the rotation of the impeller 222, the high-temperature flue gas in the circulation channel will form a circulation flow, which further improves the heat exchange rate of the air heat exchanger 3.

[0028] As one implementation method, such as Figure 4 , Figure 5 and Figure 6 As shown, further details are as follows: A filter cloth 4 is provided at the air inlet of the diversion pipe 13. The filter cloth 4 is located below the first solenoid valve 131 and is higher than the connection point between the diversion pipe 13 and the air inlet section 11 of the flue 1. The filter cloth 4 is made of glass fiber.

[0029] Glass fiber filter cloth 4 has high temperature resistance, typically withstanding high-temperature environments up to 260°C. Furthermore, it offers high filtration accuracy, making it suitable for high-temperature, high-concentration dust applications. It is primarily used in high-temperature gas emission environments, such as boiler flue gas and in industries like steel smelting. The return pipe 2 is also provided with a spray pipe 23. One end of the spray pipe 23 is connected to the inside of the return pipe 2, and the other end of the spray pipe 23 is connected to the drainage pipe 13. The connection point is located between the first solenoid valve 131 and the filter cloth 4. A fourth solenoid valve 231 is provided at the connection between the injection pipe 23 and the drainage pipe 13.

[0030] like Figure 4 and Figure 5 As shown, further details are as follows: The fifth solenoid valve 6 is installed inside the diversion pipe 13. The fifth solenoid valve 6 is located at the connection point between the diversion pipe 13 and the air inlet section 11 of the flue 1. The inside of the drainage pipe 13 is also equipped with a baffle 5, which is located between the filter cloth 4 and the fifth solenoid valve 6. The baffle 5 can connect or close the drainage pipe 13 and the flue 1.

[0031] like Figure 7 As shown, further details are as follows: The heat recovery device also includes a rotary driver, which includes a second servo motor 51. The second servo motor 51 is mounted on the outside of the drain pipe 13, and the output shaft of the second servo motor 51 is provided with a first gear 52. A rotating shaft is provided on one side of the baffle 5. The baffle 5 is rotatably connected to the side wall of the drainage pipe 13 through the rotating shaft. A second gear 53 is provided at the rotating shaft of the baffle 5. The first gear 52 meshes with the second gear 53.

[0032] like Figure 4 and Figure 5 As shown, further details are as follows: The side wall of the drainage pipe 13 is provided with a dust outlet, which is connected to the inside of the drainage pipe 13 and is located between the filter cloth 4 and the baffle 5.

[0033] like Figure 8 As shown, further details are as follows: A cover 7 is provided at the dust outlet, and the cover 7 is hinged to the outer wall of the drainage pipe 13; A cylinder 71 is installed outside the drainage tube 13. The fixed end of the cylinder 71 is hinged to the outer wall of the drainage tube 13, and the output end of the cylinder 71 is hinged to the cover 7.

[0034] In this embodiment, in order to avoid dust particles in the high-temperature flue gas covering the heat-absorbing part of the air heat exchanger 3, thereby reducing the heat exchange efficiency, it is necessary to filter the high-temperature flue gas before heat recovery. The specific process is as follows: before the high-temperature flue gas is injected into the diversion pipe 13, the third solenoid valve 21 and the fourth solenoid valve 231 are both closed, and the baffle 5 is now in an inclined state, so that the diversion pipe 13 is connected to the air inlet section 11 of the flue 1. Before the high-temperature flue gas enters the circulation channel, it will pass through the filter cloth 4 and filter the dust particles in the flue gas through the glass fiber filter cloth 4. Before the high-temperature flue gas is injected into the diversion pipe 13, the third solenoid valve 21 is closed. After the high-temperature flue gas is injected into the diversion pipe 13, the first solenoid valve 131 and the second solenoid valve 132 at the inlet and outlet of the diversion pipe 13 are closed. At this time, a circulation channel is formed in the diversion pipe 13, and the gas drive mechanism 22 starts to work. The output end of the first servo motor 224 drives the connecting rod 223 to rotate through the synchronous belt pulley group 225. The connecting rod 223 drives the first bevel gear 2231 to rotate. Since the first bevel gear 2231 meshes with the second bevel gear 2221, the connecting rod 223 will drive the second bevel gear 2221 to rotate through the first bevel gear 2231. The rotation of the second bevel gear 2221 will eventually drive the impeller 222 to rotate. At this time, the third solenoid valve 21 will be in the open state. At this time, under the rotation of the impeller 222, the high-temperature flue gas in the circulation channel will form a circulation flow. After the filter cloth 4 has been used for a long time, the amount of blocked gas passing through will also decrease. At this time, it is necessary to close the first solenoid valve 131, the third solenoid valve 21 and the fifth solenoid valve 6. The output shaft of the second servo motor 51 of the rotary driver drives the first gear 52 to rotate. The first gear 52 drives the baffle 5 to rotate through the second gear 53, so that the baffle 5 is in a horizontal state. When the gas drive mechanism 22 is activated, the output end of the first servo motor 224 drives the connecting rod 223 to rotate through the synchronous belt pulley group 225. The connecting rod 223 drives the first bevel gear 2231 to rotate, which in turn drives the second bevel gear 2221 to rotate. The rotation of the second bevel gear 2221 will eventually drive the impeller 222 to rotate. The impeller 222 delivers gas to the space between the first solenoid valve 131 and the filter cloth 4. After the gas is filled, a large number of dust particles stuck below the filter cloth 4 will fall to the top of the baffle 5. The cover 7 is opened by the cylinder 71, and then the rotary driver controls the baffle 5 to return to its tilted state. The lowest point of the tilt of the baffle 5 faces the dust outlet, and the dust particles on the baffle 5 will be discharged through the dust outlet.

[0035] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0036] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A high-efficiency heat recovery device for boiler flue (1), characterized in that, The flue (1) has an air inlet section (11) and an air outlet section (12). There are at least two heat recovery devices. The air inlets of the two heat recovery devices are connected to the air inlet section (11) of the flue (1), and the air outlets of the two heat recovery devices are connected to the air outlet section (12) of the flue (1). The heat recovery device includes a diversion pipe (13), the inlet and outlet of the diversion pipe (13) are connected to the inlet section (11) and outlet section (12) of the flue (1) respectively, the inlet of the diversion pipe (13) is equipped with a first solenoid valve (131), the outlet of the diversion pipe (13) is equipped with a second solenoid valve (132), and an air heat exchanger (3) is installed inside the diversion pipe (13), which is connected to the inlet of the boiler. A return pipe (2) is provided on the drain pipe (13) so that a circulation channel is formed inside the drain pipe (13) and the air heat exchanger (3) is located in the circulation channel.

2. The high-efficiency heat recovery device for boiler flue (1) according to claim 1, characterized in that, A third solenoid valve (21) is provided at one end of the return pipe (2), and the third solenoid valve (21) is located at the end of the return pipe (2) near the air inlet of the guide pipe (13); The inside of the return pipe (2) is equipped with a gas drive mechanism (22) for controlling the gas flow.

3. The high-efficiency heat recovery device for boiler flue (1) according to claim 2, characterized in that, The gas drive mechanism (22) includes a fixing frame (221), which is fixedly installed inside the return pipe (2); Impeller (222), the impeller (222) is mounted on the fixed frame (221), and the impeller (222) is rotatably connected to the fixed frame (221); A connecting rod (223) passes through the return pipe (2) and is rotatably and sealedly connected to the return pipe (2). A first bevel gear (2231) is provided at one end of the connecting rod (223), and a second bevel gear (2221) is provided at the axle of the impeller (222). The first bevel gear (2231) and the second bevel gear (2221) mesh with each other. The first servo motor (224) is installed outside the return pipe (2). The output end of the first servo motor (224) is connected to the connecting rod (223) through the synchronous belt pulley group (225).

4. The high-efficiency heat recovery device for boiler flue (1) according to claim 1, characterized in that, A filter cloth (4) is provided at the air inlet of the drain pipe (13). The filter cloth (4) is located below the first solenoid valve (131) and the filter cloth (4) is higher than the connection point between the drain pipe (13) and the air inlet section (11) of the flue (1).

5. A high-efficiency heat recovery device for a boiler flue (1) according to claim 4, characterized in that, The filter cloth (4) is made of glass fiber.

6. The high-efficiency heat recovery device for boiler flue (1) according to claim 4, characterized in that, A jet pipe (23) is also provided on the return pipe (2). One end of the jet pipe (23) is connected to the inside of the return pipe (2), and the other end of the jet pipe (23) is connected to the drainage pipe (13). The connection point is located between the first solenoid valve (131) and the filter cloth (4). A fourth solenoid valve (231) is provided at the connection between the injection pipe (23) and the drainage pipe (13).

7. A high-efficiency heat recovery device for a boiler flue (1) according to claim 4, characterized in that, The fifth solenoid valve (6) is installed inside the diversion pipe (13), and the fifth solenoid valve (6) is located at the connection point between the diversion pipe (13) and the air inlet section (11) of the flue (1); The drain pipe (13) is also equipped with a baffle (5), which is located between the filter cloth (4) and the fifth solenoid valve (6). The baffle (5) can connect or close the drain pipe (13) and the flue (1).

8. A high-efficiency heat recovery device for a boiler flue (1) according to claim 7, characterized in that, The heat recovery device also includes a rotary driver, which includes a second servo motor (51). The second servo motor (51) is mounted on the outside of the drain pipe (13), and the output shaft of the second servo motor (51) is provided with a first gear (52). A rotating shaft is provided on one side of the baffle (5). The baffle (5) is rotatably connected to the side wall of the drainage pipe (13) through the rotating shaft. A second gear (53) is provided at the rotating shaft of the baffle (5). The first gear (52) meshes with the second gear (53).

9. A high-efficiency heat recovery device for a boiler flue (1) according to claim 7, characterized in that, The side wall of the drainage pipe (13) is provided with a dust outlet, which is connected to the inside of the drainage pipe (13) and is located between the filter cloth (4) and the baffle (5).

10. A high-efficiency heat recovery device for a boiler flue (1) according to claim 9, characterized in that, A cover (7) is provided at the dust outlet, and the cover (7) is hinged to the outer wall of the drain pipe (13); A cylinder (71) is installed outside the drainage tube (13). The fixed end of the cylinder (71) is hinged to the outer wall of the drainage tube (13), and the output end of the cylinder (71) is hinged to the cover (7).

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