A flue gas waste heat recovery device

Abstract

This utility model discloses a flue gas waste heat recovery device, relating to the field of flue gas treatment technology. The flue gas waste heat recovery device includes a water tank, a flue gas pipe, and a stirring assembly. The water tank has an inlet at its upper end and an outlet at its lower end, and is filled with cold water for heat exchange. The flue gas pipe passes through the water tank, with its inlet and outlet located on the outer wall of the water tank. The stirring assembly is installed inside the water tank to agitate the cold water. The flue gas waste heat recovery device provided by this utility model, by using a stirring assembly inside the water tank to agitate the cold water, keeps it in a flowing state. This allows the flue gas passing through the flue gas pipe to heat the water in the tank more evenly during heat exchange, improving the efficiency of waste heat recovery from the flue gas.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, and in particular to a flue gas waste heat recovery device. Background Technology

[0002] Flue gas waste heat recovery is an important energy-saving and emission-reduction technology that aims to extract and reuse energy from high-temperature flue gas generated during industrial production. In industrial production and energy consumption, flue gas emissions are often accompanied by significant heat loss; without recovery, this results in serious energy waste. Therefore, flue gas waste heat recovery technology has emerged as a crucial means to improve energy efficiency and achieve energy conservation and emission reduction. Flue gas waste heat recovery technology is widely used in various industrial sectors, such as chemical, metallurgical, printing and dyeing, and glass manufacturing. In practical applications, high-temperature flue gas waste heat recovery technology has achieved remarkable results.

[0003] In flue gas waste heat recovery systems, cold water is typically used to recover waste heat from the flue gas. The flue gas passes through a flue pipe placed in cold water, where the water absorbs the heat and forms hot water, thus recovering the waste heat. However, the efficiency of heat transfer from the flue gas to the water in the tank through the flue pipe is low, easily leading to uneven water heating. Furthermore, the flue gas still has a certain temperature when it exits the flue pipe; direct discharge would result in insufficient waste heat recovery. Utility Model Content

[0004] In view of this, the purpose of this utility model is to overcome the shortcomings in related technologies, and this utility model provides a flue gas waste heat recovery device.

[0005] This utility model provides the following technical solution:

[0006] A flue gas waste heat recovery device includes a water tank, a flue gas pipe, and a stirring assembly.

[0007] The water tank has an inlet at the top and an outlet at the bottom. The water tank is filled with cold water for heat exchange. The flue pipe passes through the water tank, and its inlet and outlet are located on the outer wall of the water tank. The stirring assembly is installed in the water tank to agitate the cold water inside.

[0008] As a further improvement to the above technical solution, the stirring assembly includes a stirring motor and a stirring shaft. The stirring motor is installed at the upper end of the water tank, and the stirring shaft passes through the water tank. The stirring shaft is connected to the rotating shaft of the stirring motor, and multiple stirring blades are evenly distributed on the side wall of the stirring shaft.

[0009] As a further improvement to the above technical solution, the flue gas pipe is arranged in a serpentine pattern inside the water tank.

[0010] As a further improvement to the above technical solution, two flue gas pipes are provided symmetrically relative to the stirring shaft, and the two flue gas pipes are connected in parallel.

[0011] As a further improvement to the above technical solution, the air inlet of the flue gas pipe is connected to a filter cylinder, and a filter assembly is provided inside the filter cylinder. The filter assembly is used to filter and adsorb dust and impurities in the flue gas passing through the filter cylinder.

[0012] As a further improvement to the above technical solution, the filter assembly includes a filter screen, which is installed inside the filter cylinder.

[0013] As a further improvement to the above technical solution, a cleaning assembly is provided on the filter screen. The cleaning assembly includes a cleaning motor and a cleaning brush. The cleaning motor is installed on the filter screen, and the cleaning brush is located on the side of the filter screen away from the air inlet and is connected to the rotation transmission of the cleaning motor. The cleaning motor can drive the cleaning brush to rotate and clean the filter screen.

[0014] As a further improvement to the above technical solution, the filter assembly also includes an activated carbon filter plate, which is installed inside the filter cylinder and located on the side of the filter screen near the air inlet.

[0015] As a further improvement to the above technical solution, the outlet of the flue gas pipe is also provided with a circulation component, which includes a diversion box and a return pipe; the inner cavity of the diversion box is connected to the outlet of the flue gas pipe, the return pipe and the exhaust pipe respectively, the end of the return pipe away from the diversion box is connected to the part of the flue gas pipe near the inlet, and a return pump is provided on the return pipe; a first control valve and a second control valve are respectively provided on the return pipe and the exhaust pipe.

[0016] As a further improvement to the above technical solution, the flow divider box is also provided with a control component, which includes a controller and a temperature sensor. The controller is disposed on the outer wall of the flow divider box, and the temperature sensor is installed inside the flow divider box. The first control valve and the second control valve are both solenoid valves. The controller is electrically connected to the temperature sensor, the first control valve, and the second control valve, respectively.

[0017] Compared with related technologies, the beneficial effects of this utility model are:

[0018] The waste heat recovery device provided by this utility model, in actual use, firstly, continuously and stably introduces high-temperature flue gas carrying a large amount of waste heat into the flue pipe through the inlet. After entering the flue pipe, this flue gas flows along the internal channels of the flue pipe. During the flue gas flow, the flue pipe can fully absorb the heat carried by the flue gas, causing the temperature of the flue pipe itself to gradually increase.

[0019] Meanwhile, as the temperature of the flue gas pipe rises, a significant temperature difference is created between it and the cold water in the water tank. According to the principle of heat transfer, heat will be transferred from the hotter flue gas pipe to the cooler water in the water tank. As a result, the cold water in the water tank begins to absorb the heat transferred from the flue gas pipe, and its temperature gradually rises.

[0020] During the heating process, the stirring component is activated simultaneously, continuously agitating the water in the tank. This agitation breaks the static state of the water, causing it to flow continuously and come into full contact with the flue gas pipe. This ensures that every part of the water in the tank absorbs the heat transferred from the flue gas pipe more evenly, preventing localized overheating or underheating and resulting in more uniform heating of the water in the tank.

[0021] As heat exchange continues, the heat in the flue gas is gradually absorbed by the water in the tank, and the flue gas itself gradually loses heat, causing its temperature to drop. Finally, this low-temperature flue gas, having lost most of its heat, is discharged from the device through the outlet of the flue gas pipe.

[0022] The entire usage process described above offers several significant advantages. The stirring component ensures thorough contact between the water in the tank and the flue gas pipe, effectively improving the uniformity of heating the water in the tank and preventing localized overheating or underheating caused by uneven heating. This improved heating uniformity further enhances the heat exchange efficiency between the flue gas and the water in the tank, allowing for more efficient transfer of heat from the flue gas to the water. Ultimately, this increased heat exchange efficiency enables highly efficient recovery of waste heat from the flue gas, significantly improving waste heat recovery efficiency, reducing energy waste, and demonstrating high economic value and environmental significance.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the flue gas waste heat recovery device from one perspective in one embodiment of the present invention;

[0026] Figure 2 This shows a schematic diagram of the flue gas waste heat recovery device from another perspective in one embodiment of the present invention;

[0027] Figure 3 This shows another perspective structural schematic diagram of the flue gas waste heat recovery device in one embodiment of the present invention;

[0028] Figure 4 This diagram shows a partial view of the structure of a flue gas waste heat recovery device in one embodiment of the present invention.

[0029] Explanation of key component symbols:

[0030] 100-Water tank; 110-Water inlet; 120-Water outlet; 200-Flue gas pipe; 210-Air inlet; 220-Air outlet; 300-Agitator assembly; 310-Agitator motor; 320-Agitator shaft; 330-Agitator blades; 400-Filter cartridge; 500-Filter assembly; 510-Filter screen; 520-Activated carbon filter plate; 600-Cleaning assembly; 610-Cleaning motor; 620-Cleaning brush; 700-Circulation assembly; 710-Diverter box; 720-Return pipe; 721-First control valve; 730-Return pump; 740-Exhaust pipe; 741-Second control valve; 800-Control assembly; 810-Controller; 820-Temperature sensor. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] Combination Figure 1 , Figure 2 As shown, an embodiment of this utility model provides a flue gas waste heat recovery device, including a water tank 100, a flue gas pipe 200, and a stirring assembly 300.

[0037] The water tank 100 is provided with an inlet 110 at its upper end and an outlet 120 at its lower end. The water tank 100 is filled with cold water for heat exchange. The flue pipe 200 passes through the water tank 100, and the inlet 210 and outlet 220 of the flue pipe 200 are both located on the outer wall of the water tank 100. The stirring assembly 300 is installed in the water tank 100 to stir the cold water in the water tank 100.

[0038] In this embodiment, the waste heat recovery device for flue gas is first continuously and stably introduced into the flue gas pipe 200 through the inlet 210, carrying a large amount of waste heat. After entering the flue gas pipe 200, the flue gas flows along its internal channels. During the flue gas flow, the flue gas pipe 200 fully absorbs the heat carried by the flue gas, causing its own temperature to gradually increase.

[0039] Meanwhile, as the temperature of the flue pipe 200 rises, a significant temperature difference is created between it and the cold water in the water tank 100. According to the principle of heat transfer, heat will be transferred from the hotter flue pipe 200 to the colder water in the water tank 100. As a result, the cold water in the water tank 100 begins to absorb the heat transferred from the flue pipe 200, and the water temperature gradually rises.

[0040] During the heating process, the stirring component 300 is simultaneously activated, continuously agitating the water in the water tank 100. This agitation breaks the static state of the water in the tank 100, causing the water in all parts of the tank 100 to flow continuously and make full contact with the flue pipe 200. In this way, each part of the water in the tank 100 can absorb the heat transferred from the flue pipe 200 more evenly, avoiding localized overheating or underheating, thus resulting in more uniform heating of the water in the tank 100.

[0041] As heat exchange continues, the heat in the flue gas is gradually absorbed by the water in the water tank 100, and the flue gas itself gradually loses heat, causing its temperature to drop. Finally, this low-temperature flue gas, which has lost most of its heat, is discharged from the device through the outlet 220 of the flue gas pipe 200.

[0042] The entire usage process described above offers several significant advantages. The stirring component 300 ensures full contact between the water in the water tank 100 and the flue gas pipe 200, effectively improving the uniformity of heating the water in the water tank 100 by the flue gas and preventing localized overheating or underheating caused by uneven heating. This improved heating uniformity further enhances the heat exchange efficiency between the flue gas and the water in the water tank 100, allowing for more efficient transfer of heat from the flue gas to the water. Ultimately, this increased heat exchange efficiency enables highly efficient recovery of waste heat from the flue gas, significantly improving waste heat recovery efficiency, reducing energy waste, and demonstrating high economic value and environmental significance.

[0043] In some specific embodiments, the stirring assembly 300 includes a stirring motor 310 and a stirring shaft 320. The stirring motor 310 is installed at the upper end of the water tank 100, and the stirring shaft 320 passes through the water tank 100. The stirring shaft 320 is connected to the rotating shaft of the stirring motor 310. Multiple stirring blades 330 are evenly distributed on the side wall of the stirring shaft 320. The stirring motor 310 drives the stirring shaft 320 to rotate, thereby driving the synchronous rotation of each stirring blade 330, which facilitates the uniform and efficient stirring of the water in the water tank 100 and ensures the uniform heating of the water in the water tank 100.

[0044] In some specific embodiments, the flue gas pipe 200 is arranged in a serpentine pattern within the water tank 100 to extend the movement path of the flue gas within it. On one hand, the increased residence time of the high-temperature flue gas within the flue gas pipe 200 allows for more time for the gas to transfer its heat to the pipe. On the other hand, the contact area and contact time between the flue gas pipe 200 and the cold water in the water tank 100 also increase accordingly. Because the flue gas pipe 200 is serpentine within the water tank 100, its contact range with the cold water is wider, allowing heat to be transferred more evenly and fully from the flue gas pipe 200 to the cold water in the water tank 100, thereby significantly improving the efficiency of heat exchange and enabling more effective recovery and utilization of waste heat from the flue gas.

[0045] Combination Figure 3 , Figure 4 As shown, in some specific embodiments, two flue gas pipes 200 are symmetrically arranged relative to the stirring shaft 320, and the two flue gas pipes 200 are connected in parallel, which further increases the contact range between the flue gas pipes 200 and the cold water in the water tank 100, and further improves the heat exchange efficiency.

[0046] In some specific embodiments, the air inlet 210 of the flue gas pipe 200 is connected to a filter cylinder 400, and a filter assembly 500 is provided inside the filter cylinder 400. The filter assembly 500 is used to filter and adsorb dust and impurities in the flue gas passing through the filter cylinder 400. The installation of the filter cylinder 400 and the filter assembly 500 has several important implications. From the perspective of protecting the flue gas pipe 200, since the flue gas generated in industrial production often contains a large amount of dirt and impurities, if these impurities directly enter the flue gas pipe 200, they will gradually adhere to the inner wall of the flue gas pipe 200 over time. These deposits not only occupy part of the space in the flue gas pipe 200, affecting the normal flow of flue gas, but also corrode and wear the material of the flue gas pipe 200, thereby seriously damaging the flue gas pipe 200 and shortening its service life. The effective filtration and adsorption of dust and impurities by the filter assembly 500 greatly reduces the possibility of dirt and impurities in the flue gas entering the flue gas pipe 200, providing reliable protection for the flue gas pipe 200.

[0047] From the perspective of heat transfer efficiency, impurities adhering to the inner wall of the flue gas pipe 200 will form a heat insulation layer, hindering the transfer of heat from the flue gas to the outside of the flue gas pipe 200, thus affecting the heat transfer efficiency of the entire waste heat recovery device. The filtration function of the filter component 500 reduces the formation of this heat insulation layer, allowing heat in the flue gas to be transferred more smoothly and efficiently, thereby improving heat exchange efficiency.

[0048] Furthermore, from a maintenance perspective, if a large amount of impurities enters the flue gas pipe 200, cleaning it will be extremely difficult. This would not only require significant manpower and time, but could also affect the normal operation of the equipment due to incomplete cleaning. The filter assembly 500, however, filters and adsorbs impurities in advance, reducing the amount of impurities entering the flue gas pipe 200, thereby greatly reducing the difficulty of subsequent cleaning and decreasing maintenance costs and workload.

[0049] In some specific embodiments, the filter assembly 500 includes a filter screen 510, which is installed inside the filter cylinder 400, and has a simple structure that is easy to install.

[0050] In some specific embodiments, the filter screen 510 is provided with a cleaning assembly 600, which includes a cleaning motor 610 and a cleaning brush 620. The cleaning motor 610 is mounted on the filter screen 510, and the cleaning brush 620 is located on the side of the filter screen 510 away from the air inlet 210 and is connected to the cleaning motor 610 for rotational transmission. The cleaning motor 610 can drive the cleaning brush 620 to rotate and clean the filter screen 510, thereby realizing automatic cleaning of the filter screen 510, reducing the probability of the filter screen 510 being blocked by impurities, and ensuring the working reliability of this embodiment.

[0051] In some specific embodiments, the filter assembly 500 further includes an activated carbon filter plate 520, which is installed inside the filter cylinder 400 and located on the side of the filter screen 510 near the air inlet 210, to adsorb and filter pollutants in the flue gas, thereby reducing the pollution of the environment caused by the flue gas that finally exits from the air outlet 220 of the flue gas pipe 200.

[0052] In some specific embodiments, the outlet 220 of the flue gas pipe 200 is further provided with a circulation component 700, which includes a diversion box 710 and a return pipe 720. The inner cavity of the diversion box 710 is connected to the outlet 220 of the flue gas pipe 200, the return pipe 720, and the exhaust pipe 740, respectively. The end of the return pipe 720 away from the diversion box 710 is connected to the part of the flue gas pipe 200 near the inlet 210. A return pump 730 is provided on the return pipe 720. A first control valve 721 and a second control valve 741 are respectively provided on the return pipe 720 and the exhaust pipe 740. In the actual waste heat recovery operation, when performing waste heat recovery on high-temperature flue gas, a situation may occur in which the temperature of the flue gas discharged from the outlet 220 of the flue gas pipe 200 is still relatively high. This means that a large amount of residual heat remains in the flue gas and will be wasted if the flue gas is directly discharged to the outside through the exhaust pipe 740.

[0053] At this point, the on-site staff can proceed according to the actual situation. First, close the second control valve 741 to cut off the passage of the exhaust pipe 740 and prevent the flue gas from being directly discharged to the outside. Next, open the first control valve 721 to ensure that the return pipe 720 is unobstructed. Then, start the return pump 730, which will draw the high-temperature flue gas discharged from the outlet 220 back into the flue gas pipe 200 near the inlet 210 through the return pipe 720.

[0054] The flue gas re-entering the flue gas pipe 200 will participate in the heat exchange process again, transferring heat with the cold water outside the flue gas pipe 200. Through this circulating conduction method of the flue gas, the residence time of the flue gas in the device is extended, and the number of contacts with the cold water is increased, thereby enabling more complete recovery of the waste heat in the flue gas and greatly improving the energy utilization efficiency of the entire flue gas waste heat recovery device.

[0055] In some specific embodiments, the diversion box 710 is further provided with a control component 800, which includes a controller 810 and a temperature sensor 820. The controller 810 is disposed on the outer wall of the diversion box 710, and the temperature sensor 820 is installed inside the diversion box 710. A commonly used temperature sensor 820 model is the PT100 platinum resistance temperature sensor 820, which has the characteristics of high measurement accuracy, good stability, and strong interchangeability. It can accurately measure the temperature of the flue gas inside the diversion box 710 within a wide temperature range and convert the temperature signal into an electrical signal for transmission to the controller 810. The first control valve 721 and the second control valve 741 are both solenoid valves. The controller 810 is electrically connected to the temperature sensor 820, the first control valve 721, and the second control valve 741, respectively. In practical applications, a commonly used controller 810 model is such as the Siemens S7-200 SMART PLC. The controller 810 has many advantages such as small size, powerful functions, simple programming and high cost performance. It can well meet the needs of this device for automatic control of flue gas recirculation, realize the reception and processing of signals from temperature sensor 820, and the precise control of solenoid valve and recirculation pump 730.

[0056] During actual operation, when the flue gas in the flue pipe 200 is discharged and flows into the diversion box 710, the temperature sensor 820 immediately begins to function. It can sense the temperature changes within the diversion box 710 in real time and accurately, and quickly and accurately transmit the sensed temperature signal to the controller 810. After receiving the signal, the controller 810 processes and analyzes the detected temperature data and clearly displays it on its own screen, allowing staff to easily monitor the temperature within the diversion box 710.

[0057] Meanwhile, the controller 810 has a pre-set temperature limit value, which is determined based on factors such as the optimal efficiency of flue gas waste heat recovery and the safe operation requirements of the device. When the temperature detected by the temperature sensor 820 exceeds this limit value, it indicates that the temperature of the flue gas discharged from the flue gas pipe 200 is still high, containing a large amount of recoverable waste heat. At this time, the controller 810 will react quickly, issuing a control command to close the second control valve 741, cutting off the passage of the exhaust pipe 740 and preventing the high-temperature flue gas from being directly discharged to the outside, thus avoiding energy waste; at the same time, it will open the first control valve 721, allowing the return pipe 720 to be unobstructed. Simultaneously, the controller 810 will also start the return pump 730, which will generate a strong suction force to draw the flue gas discharged from the flue gas pipe 200 back into the part of the flue gas pipe 200 near the air inlet 210 through the return pipe 720, where it will participate in the heat exchange process again.

[0058] Through the organic combination and coordinated operation of the aforementioned components such as controller 810, temperature sensor 820, solenoid valve, and reflux pump 730, automated control of flue gas recirculation is achieved. This automated control method not only ensures that the flue gas waste heat recovery device in this embodiment always operates in optimal condition, maximizing the utilization efficiency of flue gas waste heat recovery, but also significantly reduces the workload of employees. Employees do not need to constantly monitor the device or manually operate various valves and equipment; they only need to perform simple settings and monitoring of controller 810 when necessary, thereby improving work efficiency and reducing the possibility of human error.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flue gas heat recovery device, characterized by, include: A water tank (100) is provided with an inlet (110) at the upper end and an outlet (120) at the lower end. The water tank (100) is filled with cold water for heat exchange. A flue pipe (200) is installed inside the water tank (100), and the air inlet (210) and air outlet (220) of the flue pipe (200) are both located on the outer wall of the water tank (100). A stirring assembly (300) is installed inside the water tank (100) to agitate the cold water inside the water tank (100).

2. The flue gas heat recovery device according to claim 1, characterized in that, The stirring assembly (300) includes a stirring motor (310) and a stirring shaft (320). The stirring motor (310) is installed on the upper end of the water tank (100), and the stirring shaft (320) passes through the water tank (100). The stirring shaft (320) is connected to the rotating shaft of the stirring motor (310) for transmission. Multiple stirring blades (330) are evenly distributed on the side wall of the stirring shaft (320).

3. The flue gas heat recovery device according to claim 2, characterized in that, The flue pipe (200) is arranged in a serpentine pattern inside the water tank (100).

4. The flue gas heat recovery device according to claim 3, characterized in that, Two flue gas pipes (200) are symmetrically provided relative to the stirring shaft (320), and the two flue gas pipes (200) are connected in parallel.

5. The flue gas heat recovery device according to claim 1, characterized in that, The inlet (210) of the flue gas pipe (200) is connected to a filter cylinder (400), and a filter assembly (500) is provided inside the filter cylinder (400). The filter assembly (500) is used to filter and adsorb dust and impurities in the flue gas passing through the filter cylinder (400).

6. The flue gas heat recovery device according to claim 5, characterized in that The filter assembly (500) includes a filter screen (510) installed inside the filter cartridge (400).

7. The flue gas heat recovery device according to claim 6, characterized in that The filter screen (510) is provided with a cleaning assembly (600), which includes a cleaning motor (610) and a cleaning brush (620). The cleaning motor (610) is mounted on the filter screen (510), and the cleaning brush (620) is located on the side of the filter screen (510) away from the air inlet (210) and is connected to the rotation transmission of the cleaning motor (610). The cleaning motor (610) can drive the cleaning brush (620) to rotate and clean the filter screen (510).

8. The flue gas heat recovery device according to claim 6, characterized in that, The filter assembly (500) further includes an activated carbon filter plate (520), which is installed inside the filter cylinder (400) and located on the side of the filter screen (510) near the air inlet (210).

9. The flue gas heat recovery device according to any one of claims 1 to 8, characterized in that, The outlet (220) of the flue pipe (200) is also provided with a circulation assembly (700), which includes a diversion box (710) and a return pipe (720). The inner cavity of the diversion box (710) is connected to the outlet (220) of the flue pipe (200), the return pipe (720), and the exhaust pipe (740), respectively. The end of the return pipe (720) away from the diversion box (710) is connected to the part of the flue pipe (200) near the inlet (210). A return pump (730) is provided on the return pipe (720). A first control valve (721) and a second control valve (741) are provided on the return pipe (720) and the exhaust pipe (740), respectively.

10. The flue gas heat recovery device according to claim 9, characterized in that, The flow divider box (710) is also provided with a control component (800), which includes a controller (810) and a temperature sensor (820). The controller (810) is disposed on the outer wall of the flow divider box (710), and the temperature sensor (820) is installed inside the flow divider box (710). The first control valve (721) and the second control valve (741) are both solenoid valves. The controller (810) is electrically connected to the temperature sensor (820), the first control valve (721), and the second control valve (741) respectively.

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