A new fresh air flue reconstruction device based on temperature difference power generation and a heating stove

Abstract

The application discloses a fresh air flue pipe reconstruction device and heating furnace based on thermoelectricity, and belongs to the technical field of heat exchange devices, which comprises a central flue, thermoelectricity sheets, arc fin radiating fins, a fresh air filter screen, a filter screen base, an outer shell, a filter screen top cover and a fan; one side of the thermoelectricity sheets is attached to the outer side of the rectangular flue, and the other side is closely attached to the arc fin radiating fins; the fresh air filter screen is arranged on the outer side of the arc fin radiating fins, and the outer shell is arranged on the outer side of the fresh air filter screen; the two ends of the fresh air filter screen are respectively connected with the filter screen top cover and the filter screen base; the fan is arranged on the outer shell, and an airflow channel is arranged between the filter screen top cover and the outer wall of the central flue. The fresh air fan is driven by the thermoelectricity, power supply is realized in a closed loop without external power supply, the design idea of the coaxial flue pipe is adopted, the boiler waste heat is effectively recycled, the indoor pollutant concentration is actively reduced through the introduction of the fresh air system, and only the existing flue pipe needs to be replaced, so that the existing heating furnace can be upgraded and modified.

Description

Technical Field

[0001] This invention belongs to the technical field of heat exchange devices, specifically relating to a new air flue gas duct modification device and heating furnace based on thermoelectric power generation. Background Technology

[0002] Traditional coal-fired heating stoves used indoors result in insufficient contact between the burning coal and air, requiring frequent manual ventilation. Consequently, their thermal efficiency is low, exhaust gas temperature is high, and they easily produce harmful gases such as CO, NOx, SO2, and PM, seriously threatening the lives of users. Therefore, developing a fresh air purification system suitable for such equipment is essential.

[0003] The basic principle of most current fresh air systems is to use a fan to supply fresh air into the enclosed room from one side and exhaust air to the outside from the other side, thus creating a "fresh air flow field" within the room. In addition, while supplying air, the system also performs other operations such as filtering, disinfecting, sterilizing, oxygenating, and preheating the indoor air according to actual needs. In such fresh air systems, both the supply and exhaust processes require electricity. However, since power supply is often intermittent in the aforementioned regions, using thermoelectric power generation becomes an effective way to solve this problem. Its basic principle is to use the Seebeck effect of materials to convert heat energy into electrical energy; the magnitude of the electromotive force is positively correlated with the temperature difference.

[0004] For coal-fired heating boilers, the equipment mainly relies on thermal radiation. The combustible substances in the fuel are gasified and burned at high temperatures, releasing heat to the outside and being discharged from the chimney. However, due to the lack of convective heat exchange with the cooling medium, the flue gas exhaust temperature often exceeds 200°C, and there is insufficient heat exchange with the outside.

[0005] The existing patent with publication number CN105526596A discloses a flue gas water heater temperature difference power generation device. It combines an internal enhanced heat exchange flue with a cylindrical temperature difference power generation plate and a cold water radiator. It ensures close contact through thermally conductive silicone grease, increases the heat exchange area and efficiency, and adapts to different needs through modular design. It generates electricity by utilizing the temperature difference between flue gas and inlet water. It focuses on solving the problems of energy waste, low thermal efficiency, and ineffective utilization of heat energy in flue gas caused by the large amount of waste heat emitted into the atmosphere with the flue gas during the operation of existing gas water heaters. However, it does not achieve an integrated closed loop of energy recovery and utilization, and it cannot solve the problem of indoor fresh air pollution caused by the combustion of traditional heating boilers. Summary of the Invention

[0006] To solve the problems of fresh air circulation and waste heat utilization in coal-fired heating boilers, and to overcome the discontinuous power supply during their operation, this invention provides a fresh air flue modification device and heating boiler based on thermoelectric power generation.

[0007] To achieve the above objectives, the present invention provides a new air duct modification device based on thermoelectric power generation, comprising a central flue, a thermoelectric generator, an arc-shaped finned heat sink, a fresh air filter, a filter base, an outer shell, a filter top cover, and a fan; one side of the thermoelectric generator is attached to the outside of the central flue, and the other side is tightly attached to the arc-shaped finned heat sink; the fresh air filter is disposed on the outside of the arc-shaped finned heat sink, and the outer shell is disposed on the outside of the fresh air filter; the two ends of the fresh air filter are respectively connected to the filter top cover and the filter base; a fan is disposed on the outer shell, an airflow channel is disposed between the filter top cover and the outer wall of the central flue, and the output end of the thermoelectric generator is connected to the power input end of the fan.

[0008] Furthermore, an outer casing top cover is provided above the filter screen top cover. A sealing groove and a connecting hole are provided on the filter screen top cover. A sealing ring is provided in the sealing groove. A side hole seat is provided on the outer casing top cover. The outer casing top cover is connected to the filter screen top cover through the side hole seat and the connecting hole.

[0009] Furthermore, the outer casing is cylindrical, and fans are installed on opposite sides of the outer casing. The fans are axial flow fans, and there are four fans in total, with two fans installed together and the four fans operating independently.

[0010] Furthermore, a display control system is also installed on the outer casing. The signal output terminal of the display control system is connected to the control signal input terminal of the fan, and the output terminal of the thermoelectric generator is connected to the power input terminal of the display control system.

[0011] Furthermore, the central flue includes an upper chimney interface, a middle rectangular flue, a lower connecting flange, and a furnace body interface. The chimney interface has a circular cross-section and is used to connect to the coaxial flue downstream of the flue gas. The rectangular flue has a rectangular cross-section, and its surface is in contact with the thermoelectric generator. The connecting flange is connected to the filter base. The furnace body interface has a circular cross-section and is connected to the coal-fired heating furnace.

[0012] Furthermore, the thermoelectric generators are arranged in groups, and the thermoelectric generators are connected in series, in parallel, or in a mixed series-parallel connection.

[0013] Furthermore, the arc-shaped finned heat sink is made of stainless steel, aluminum alloy, or pure copper. The connection surface between the arc-shaped finned heat sink and the thermoelectric generator is coated with thermal grease. The fin height on the arc-shaped finned heat sink is 15~50mm. The overall outer contour of the fins of the arc-shaped finned heat sink is arc-shaped. The farthest distance between the top of the fins of the arc-shaped finned heat sink and the filter screen does not exceed 15mm.

[0014] Furthermore, the filter screen is cylindrical in shape, including the filter screen and the filter screen frame. The filter screen is connected to the inside of the filter screen frame, and the filter screen frame is used to support the filter screen. The filter screen includes pre-filter, medium-efficiency filter and high-efficiency filter screen, and the material is made of glass fiber, activated carbon and composite materials.

[0015] Furthermore, the filter base includes a frame, a top connecting hole, a bottom groove, a base, and a bottom connecting hole; the frame is generally cylindrical, the top connecting hole is used to connect with the top cover of the filter, forming a top groove after connection, and the filter base is provided with a bottom groove, with both ends of the filter located in the top groove and the bottom groove respectively.

[0016] On the other hand, the present invention also proposes a heating furnace, including the above-mentioned new flue gas duct modification device based on thermoelectric power generation.

[0017] Compared with the prior art, the present invention has the following advantages: This invention addresses the disadvantages of low thermal efficiency and high flue gas temperature in coal-fired heating boilers by utilizing thermal difference power generation to drive fresh air fans. It achieves a closed-loop power supply without the need for an external power source, making it highly suitable for rural remote areas and high-altitude and cold regions with insufficient power supply. The coaxial flue technology of the gas-fired boiler is coupled with the fresh air system. After the flue gas from the coal-fired boiler passes through the coaxial flue, the waste heat is transferred to the air. The preheated air is then sent into the room through two opposite directions by the suction force of the fan after passing through low-efficiency, medium-efficiency or high-efficiency filters. This not only increases the fresh air volume, but also further manifests the heat of the coal as hot air, thereby improving the overall thermal efficiency of the boiler. By combining a fresh air system with a coal-fired heating system, filtered and purified air is introduced from the outside, thereby actively reducing the concentration of pollutants indoors. In addition, due to the continuous introduction of fresh air, the indoor oxygen content can be maintained at a normal level without the need to open windows for ventilation, which further improves the safety and reliability of the coal-fired heating boiler. The manufacturing and modification costs are low. For existing coal-fired heating boilers, it is only necessary to replace the original flue pipe with the design of this invention and add a coaxial flue pipe that can connect to the outside.

[0018] Furthermore, the sealed connection between the filter top cover and the outer casing top cover ensures the airtightness of the device, prevents unfiltered air from entering through gaps, ensures that all fresh air is purified by the filter, and at the same time makes the structure stable and easy to assemble and maintain.

[0019] Furthermore, the cylindrical outer shell facilitates airflow organization; multiple independently operating axial fans are symmetrically arranged on both sides, which can form a balanced and powerful through airflow, improve fresh air exchange efficiency, and adapt to different air volume requirements.

[0020] Furthermore, the display control system helps to realize the intelligent operation and status monitoring of the device, allowing users to intuitively understand the working status and adjust the fan; the system is directly powered by thermoelectric generators, further enhancing the closed-loop characteristics of energy self-sufficiency.

[0021] Furthermore, the segmented structure of the central flue can be adapted to the existing flue system of coal-fired boilers. The circular interface facilitates docking, the rectangular section provides a flat surface to maximize the fit of the thermoelectric generator, and the connecting flange is used to fix the entire device.

[0022] Furthermore, the thermoelectric generators are arranged in groups, and the thermoelectric generators are connected in series, parallel, or a combination of series and parallel; the series and parallel combination can adjust the output voltage and current to match the electrical parameters of the subsequent electrical equipment, maximize the utilization of thermoelectric energy, and stably output the required electrical energy.

[0023] Furthermore, the metal material and thermal grease coating can efficiently conduct heat from the cold end; the arc-shaped fins greatly increase the heat dissipation area in a limited space; the design of the fin tips being close to the filter screen allows the cold air to be preheated before entering, improving heat recovery efficiency and preventing frost from forming on the heat sink.

[0024] Furthermore, the cylindrical structure conforms to the airflow path; the multi-stage combination technology of primary, medium and high efficiency filters can filter dust and pollutants of different particle sizes step by step; the composite filter screen uses materials such as activated carbon, which expands its functions of removing odors and sterilizing, significantly improving the air quality of the introduced fresh air.

[0025] Furthermore, the filter base includes a frame, a top connecting hole, a bottom groove, a base, and a bottom connecting hole. The frame is generally cylindrical, and the top connecting hole connects to the top cover of the filter, forming a top groove. The filter base has a bottom groove, with both ends of the filter located in the top and bottom grooves, respectively. The groove design securely fixes and seals both ends of the cylindrical filter, forming a complete fresh air channel. The modular design facilitates the disassembly, cleaning, or replacement of the filter. Attached Figure Description

[0026] Figure 1 This is an exploded schematic diagram of the components of a new flue gas duct modification device based on thermoelectric power generation according to the present invention.

[0027] Figure 2a This is a 1 / 4 cross-sectional front view of a new air duct modification device based on thermoelectric power generation according to the present invention. Figure 2b This is an isometric view. Figure 2c This is a quarter-section axonometric view.

[0028] Figure 3a 3a is a front view schematic diagram of the flow path of flue gas and air in a new air flue gas duct modification device based on thermoelectric power generation according to the present invention, and 3b is a top view schematic diagram of the flow path of flue gas and air in a new air flue gas duct modification device based on thermoelectric power generation according to the present invention.

[0029] Figure 4 This is a complete connection diagram of a new air duct modification device based on thermoelectric power generation according to the present invention.

[0030] Figure 5 This is a schematic diagram of the central flue of the present invention.

[0031] Figure 6 This is a schematic diagram showing the connection of the outer side of the central flue of the present invention.

[0032] Figure 7 This is a schematic diagram of the structure of the filter screen of the present invention.

[0033] Figure 8a 8b is an axonometric view of the filter base of the present invention, 8c is a front view of the filter base of the present invention, and 8c is a sectional view of the filter base of the present invention.

[0034] Figure 9 This is a schematic diagram of the outer casing of the present invention.

[0035] Figure 10 This is a schematic diagram of the structure of the filter screen top cover of the present invention.

[0036] Figure 11a This is a partial structural diagram of the bottom surface of the top cover of the outer casing of the present invention; Figure 11b This is a schematic diagram of the structure of the top cover of the outer shell of the present invention.

[0037] In the attached diagram: 1. Central flue; 2. Thermoelectric generator; 3. Arc-shaped finned heat sink; 4. Fresh air filter; 5. Filter base; 6. Outer casing; 7. Filter top cover; 8. Sealing ring; 9. Outer casing top cover; 10. Fan; 11. Display and control system; 101. Chimney interface; 102. Rectangular flue; 103. Connecting flange; 104. Furnace body interface; 401. Filter; 402. Filter frame; 5. 01. Frame, 502. Top connecting hole, 503. Bottom groove, 504. Base, 505. Bottom connecting hole, 601. Cylinder, 602. First opening, 603. Threaded hole, 604. Second opening, 605. Inner hole, 606. Third opening, 701. Top surface, 702. Sealing groove, 901. Fresh air pipe, 902. Smoke pipe support frame, 903. Top cover surface, 904. Side hole seat. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] This invention is based on coaxial flue technology to construct a fresh air purification system, which is mostly used in gas wall-hung boilers and gas water heaters. Its main structure consists of inner and outer pipes. The inner pipe is connected to the chimney to discharge flue gas, and the outer pipe is connected to the housing to introduce air. When the cold air enters the housing, it exchanges heat with the flue gas, recovering waste heat while being preheated itself, which helps to improve the boiler combustion efficiency.

[0040] This invention combines coal-fired heating and a fresh air system using thermoelectric power generation technology. It utilizes the temperature difference between the high-temperature flue gas from coal combustion and the environment to meet the power requirements of the fresh air system, thus achieving a closed-loop energy system that integrates clean heating, fresh air circulation, and power self-sufficiency.

[0041] like Figure 1 , Figure 2a , Figure 2b , Figure 2c As shown, the present invention discloses a fresh air flue modification device based on thermoelectric power generation, comprising a central flue 1, multiple groups of thermoelectric generators 2, arc-shaped finned heat sinks 3, a fresh air filter 4, a filter base 5, an outer shell 6, a filter top cover 7, a sealing ring 8, an outer shell top cover 9, four identical fans 10, and a display control system 11. One end of the thermoelectric generator 2 is attached to the outside of the central flue 1, and the other end is in close contact with the arc-shaped finned heat sink 3. The filter base 5 and the filter top cover 7 together fix the fresh air filter 4 to the outside of the central flue 1, and the fresh air filter 4 is located outside the arc-shaped finned heat sink 3. The outer shell top cover 9 is connected to the filter top cover 7 by bolts, and a sealing ring 8 is arranged on the contact surface between the outer shell top cover 9 and the filter top cover 7. The outer shell 6 is connected to the lower filter base 5 and the upper outer shell top cover 9 by bolts, thereby forming a complete outer shell. Four fans 10 distributed on opposite sides and a display control system 11 located in the middle of the two fans are also installed on the outside of the outer shell 6. This invention directly converts waste heat from flue gas into electrical energy by attaching a thermoelectric generator to a high-temperature flue and a low-temperature heat sink. This electrical energy is then used to drive a fan, which forces outdoor air through a filter and into the room. This achieves an integrated closed loop of waste heat recovery power generation and electric-driven fresh air, which is energy-saving and highly efficient.

[0042] like Figure 3a and Figure 3b As shown, the new flue gas duct modification device based on thermoelectric power generation has a process divided into flue gas side and air side. Flue gas flows upward inside the central flue gas duct 1; air flows downward outside the central flue gas duct, exchanging heat with the flue gas while scouring the arc-shaped finned heat sink 3. Then, under the influence of the suction of the fan 10, it flows outward and passes through the filter screen 4. Finally, it is discharged into the room from the fans on both sides in a ring flow.

[0043] like Figure 4 , Figure 5As shown, the central flue 1 includes an upper chimney interface 101, a middle rectangular flue 102, a lower connecting flange 103, and a furnace body interface 104. The chimney interface 101 has a circular cross-section and is used to connect to the inner tube of the coaxial flue 13; the rectangular flue 102 has a rectangular cross-section and its surface is smoothed to reduce the contact thermal resistance with the thermoelectric generator 2; the connecting flange 103 is connected to the filter screen base 5; and the furnace body interface 104 has a circular cross-section and is connected to the coal-fired heating furnace 12.

[0044] like Figure 6 As shown, the thermoelectric generators 2 are arranged in pairs, with one side attached to the outer wall of the rectangular flue 102 of the central flue 1, and the other side attached to the arc-shaped finned heat sink 3. The connection method of the thermoelectric generators 2 is selected according to the power of the four fans 10, including series, parallel, or a combination of series and parallel. The pair arrangement of the thermoelectric generators 2 can make full use of the heat dissipation area of ​​the central flue 1, increase the heat exchange area and power generation area, improve the total power generation and output power, and meet the power demand of the subsequent load. At the same time, the pair arrangement makes the whole machine more evenly heated and stressed, reduces local stress and deformation, and improves structural stability and service life. The attachment of one side to the outer wall of the rectangular flue 102 of the central flue 1 ensures that the high-temperature heat source and the hot end of the generator are in close contact, reducing contact thermal resistance and ensuring that heat is efficiently conducted to the hot end of the thermoelectric generator, improving power generation efficiency and output stability. Compared with curved surfaces, the rectangular plane is easier to ensure flatness of the fit, avoiding the decrease in power generation performance caused by gaps.

[0045] The arc-shaped finned heat sink 3 is made of stainless steel, aluminum alloy, or pure copper. The bottom surface of the arc-shaped finned heat sink 3 is bonded to the thermoelectric generator 2 using thermally conductive silicone grease. The fin height is 15-50mm, and the overall outer contour of the fins is arc-shaped to reduce airflow resistance. The furthest distance between the top of the fin and the filter screen 4 does not exceed 15mm. The arc-shaped fins increase the heat dissipation area, and combined with forced convection from the fan, ensure that the cold end maintains a low temperature, thus stably maintaining power generation performance. The four fans 10 can be flexibly connected in series, parallel, or a hybrid series-parallel configuration to match the fan operating voltage, current, and total power requirements, achieving optimal matching between power generation output and load, ensuring stable fan startup and reliable operation. The output voltage and current can be flexibly adjusted according to actual operating conditions, improving system adaptability, fault tolerance, and power generation utilization.

[0046] like Figure 7 As shown, the fresh air filter 4 is cylindrical in shape and includes filter 401 and filter frame 402. Filter 401 includes pre-filter, medium-efficiency filter and high-efficiency filter. Filter 401 adopts a round tube integrated composite filter and is made of glass fiber, activated carbon and composite materials.

[0047] like Figure 8a , 8bAs shown in Figure 8c, the filter base 5 includes a frame 501, a top connecting hole 502, a bottom groove 503, a base 504, and a bottom connecting hole 505. The frame 501 is generally cylindrical. Multiple protruding structures extend inward from the top of the frame 501 and have top connecting holes 502. Multiple top connecting holes 502 are evenly distributed circumferentially and are used to connect with the filter top cover 7. The top groove formed after connection, together with the bottom groove 503 of the filter base 5, fixes the filter 4. The bottom edge of the frame 501 is rolled upward to form the bottom groove 503. Multiple protruding structures extend outward from the outer edge of the bottom groove 503 and have bottom connecting holes 505 on these protruding structures. The cylindrical structure of the frame 501 provides high structural strength and uniform stress distribution, offering stable support for the filter 4, preventing filter deformation and collapse, and ensuring filtration area and ventilation efficiency. The top connecting holes 502 are evenly arranged circumferentially, allowing for uniform force connection with the filter screen top cover 7. This ensures precise positioning and a secure connection, preventing loosening or shifting and guaranteeing the overall stability of the filter assembly. The top groove and bottom groove 503 work together to clamp the filter screen 4, forming a continuous and uniform circumferential clamping and fixing effect. This prevents warping, air leakage, and shifting of the filter screen edges, ensuring a sealed filtration effect and preventing unfiltered air from bypassing. The bottom rolled edge forming the bottom groove 503 is integrally molded with a rolled edge structure, resulting in high structural rigidity and a simple manufacturing process. While achieving filter screen positioning, it also improves the overall structural strength of the base and reduces stress concentration. The bottom connecting holes 505 are used for overall installation and fixation, facilitating reliable connection between the filter screen base 5 and the entire housing, and enabling quick assembly, maintenance, and replacement of the filter assembly.

[0048] like Figure 9 As shown, the outer casing 6 has a cylindrical structure; one side of the cylindrical casing 601 has a first opening 602, and the opposite side of the first opening 602 has a second opening 604. The first opening 602 and the second opening 604 are provided with threaded holes 603 for fastening the fan 10. A third opening 606 is located in the middle of the first opening 602 and the second opening 604. The third opening 606 is used to install the display control system 11, and the first opening 602 and the second opening 604 on the two opposite sides are used to install two pairs of fans 10. The top of the cylindrical casing 601 also has an inner hole 605 for connecting to the top cover 9 of the outer casing.

[0049] like Figure 10As shown in Figure 11, the outer casing top cover 9 includes a fresh air inlet 901, a flue support frame 902, a top cover surface 903, and side hole seats 904. The fresh air inlet 901 is connected to the outer pipe of the coaxial flue 13. The flue support frame 902 is coaxially arranged inside the fresh air inlet 901 and connected to the inner wall of the fresh air inlet 901. The flue support frame 902 is used to fix the chimney interface 101 of the central flue 1. The three side hole seats 904 are used to fix the outer casing top cover 9 and the outer casing 6. When the outer casing top cover 9 and the outer casing 6 are connected, the top cover surface 903 of the outer casing top cover 9 is in contact with the top surface 701 of the filter screen top cover 7. A sealing ring 8 is installed in the sealing groove 702, and the height of the sealing ring 8 is slightly higher than the depth of the sealing groove 702. The side hole seats 904 are used to connect to the top surface 701 of the filter screen top cover 7. The fresh air inlet pipe 901 connects to the outer pipe of the coaxial flue 13 to form an independent and closed fresh air intake channel, enabling the smooth introduction of outdoor fresh air; it also provides an installation foundation for the flue support frame 902, ensuring the positioning of the internal flue.

[0050] The flue support frame 902 is coaxially arranged inside the fresh air duct, ensuring strict coaxiality between the central flue 1 and the fresh air channel. It directly fixes the chimney interface 101, improving the overall rigidity and stability of the flue and reducing the risk of vibration, displacement, and leakage. The support structure does not obstruct the fresh air flow, balancing support strength and ventilation efficiency. The top cover surface 903 fits against the top surface 701 of the filter screen top cover 7, forming the main sealing surface between the top cover and the filter screen top cover, providing a flat and continuous pressing contact surface, creating conditions for the compression sealing of the sealing ring 8. The side hole seat 904 is used for multi-point fastening connection between the outer shell top cover 9 and the outer shell 6 and the filter screen top cover 7, ensuring the overall structural strength, achieving reliable positioning and pressing of the top cover, and ensuring that the sealing ring is evenly compressed, improving sealing reliability. The height of the sealing ring is slightly higher than the groove depth. After assembly, it is continuously pre-pressed to form a durable and reliable end face seal, effectively preventing fresh air leakage, flue gas backflow, and dust entry, ensuring that the fresh air system and the smoke exhaust system do not cross-contaminate.

[0051] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A novel ventilation duct retrofit device based on thermoelectric power generation, characterized in that, It includes a central flue (1), a thermoelectric generator (2), an arc-shaped finned heat sink (3), a fresh air filter (4), a filter base (5), an outer shell (6), a filter top cover (7), and a fan (10); one side of the thermoelectric generator (2) is attached to the outside of the central flue (1), and the other side is attached to the arc-shaped finned heat sink (3); the fresh air filter (4) is set on the outside of the arc-shaped finned heat sink (3), and the outer shell (6) is set on the outside of the fresh air filter (4); the two ends of the fresh air filter (4) are connected to the filter top cover (7) and the filter base (5) respectively; a fan (10) is set on the outer shell (6), and an airflow channel is set between the filter top cover (7) and the outer wall of the central flue (1); the output end of the thermoelectric generator (2) is connected to the power input end of the fan (10).

2. The new air duct retrofit device based on thermoelectric power generation according to claim 1, characterized in that, A housing top cover (9) is provided above the filter screen top cover (7). A sealing groove (702) and a connecting hole are provided on the filter screen top cover (7). A sealing ring (8) is provided in the sealing groove (702). A side hole seat (904) is provided on the housing top cover (9). The housing top cover (9) is connected to the filter screen top cover (7) through the side hole seat (904) and the connecting hole.

3. The new air duct retrofit device based on thermoelectric power generation according to claim 1, characterized in that, The outer shell (6) is cylindrical, and fans (10) are respectively installed on opposite sides of the outer shell (6). The fans (10) are axial flow fans. There are four fans (10), two of which are installed in a group and the four fans (10) operate independently.

4. The new air duct retrofit device based on thermoelectric power generation according to claim 1, characterized in that, The outer casing (6) is also equipped with a display control system (11). The signal output terminal of the display control system (11) is connected to the control signal input terminal of the fan (10), and the output terminal of the thermoelectric generator (2) is connected to the power input terminal of the display control system (11).

5. A new air duct retrofit device based on thermoelectric power generation according to claim 1, characterized in that, The central flue (1) includes an upper chimney interface (101), a middle rectangular flue (102), a lower connecting flange (103), and a furnace interface (104). The chimney interface (101) has a circular cross-section and is used to connect to the coaxial flue (13) downstream of the flue gas. The rectangular flue (102) has a rectangular cross-section and its surface is in contact with the thermoelectric generator (2). The connecting flange (103) is connected to the filter base (5). The furnace interface (104) has a circular cross-section and is connected to the coal-fired heating furnace (12).

6. A new air duct retrofit device based on thermoelectric power generation according to claim 1, characterized in that, The thermoelectric generators (2) are arranged in groups, and the thermoelectric generators (2) are connected in series, in parallel or in a mixed series and parallel connection.

7. A new air duct retrofit device based on thermoelectric power generation according to claim 1, characterized in that, The arc-shaped finned heat sink (3) is made of stainless steel, aluminum alloy or pure copper. The connection surface between the arc-shaped finned heat sink (3) and the thermoelectric generator (2) is coated with thermal grease. The fin height on the arc-shaped finned heat sink (3) is 15~50mm. The overall outer contour of the fins of the arc-shaped finned heat sink (3) is arc-shaped. The furthest distance between the top of the fins of the arc-shaped finned heat sink (3) and the filter screen (4) does not exceed 15mm.

8. A new air duct retrofit device based on thermoelectric power generation according to claim 1, characterized in that, The filter screen (4) is cylindrical in shape and includes a filter screen (401) and a filter screen frame (402). The filter screen (401) is connected to the inside of the filter screen frame (402). The filter screen frame (402) is used to support the filter screen (401). The filter screen (401) is a composite filter screen with an integrated round tube.

9. A new air duct retrofit device based on thermoelectric power generation according to claim 1, characterized in that, The filter base (5) includes a frame (501), a top connection hole (502), a bottom groove (503), a base (504), and a bottom connection hole (505). The frame (501) is generally cylindrical. The top connection hole (502) is used to connect with the top cover (7) of the filter. The top groove is formed after connection. The filter base (5) is provided with a bottom groove (503). The two ends of the filter (4) are located in the top groove and the bottom groove (503) respectively.

10. A heating stove, characterized in that, Including the new flue gas duct modification device based on thermoelectric power generation as described in any one of claims 109.

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