Convection heat exchange structure capable of adjusting outlet flue gas temperature

Abstract

The utility model discloses a kind of convection heat exchange structures of adjustable outlet smoke temperature, including furnace body, first convection section coil pipe, second convection section coil pipe, third convection section coil pipe, first ash bucket, second ash bucket, communication pipeline and regulating valve, first convection chamber, second convection chamber, third convection chamber and smoke inlet are equipped in the furnace body, first ash bucket and second ash bucket are connected on the furnace body, the lower end of first convection chamber and the lower end of second convection chamber are communicated with first ash bucket respectively, the lower end of third convection chamber is communicated with second ash bucket, smoke outlet is equipped on second ash bucket, one end of communication pipeline is communicated with first ash bucket, the other end of communication pipeline is communicated with second ash bucket, regulating valve is installed in communication pipeline.The utility model can adjust the temperature of exhaust flue gas, can adjust flue gas temperature to suitable denitration temperature, and then benefit to make the emission of flue gas comply with environmental protection requirement.

Description

Technical Field

[0001] This utility model relates to a convective heat transfer structure with adjustable outlet flue gas temperature. Background Technology

[0002] Currently, convection heat transfer structures are used in organic heat carrier furnaces to transfer heat from flue gas to heat transfer oil via convection. For example, the combined organic heat carrier furnace disclosed in Chinese Patent No. CN214370953U incorporates a convection heat transfer structure. To ensure that flue gas emissions meet environmental protection requirements, one existing treatment method is to send the flue gas discharged from the convection heat transfer structure into a denitrification device for denitrification. The temperature of the flue gas is crucial for denitrification; if the flue gas temperature is too low, it will lead to a decrease in catalyst activity, resulting in a significant reduction in denitrification efficiency and failure to meet environmental requirements. If the flue gas temperature is too high, high-temperature side reactions will occur, generating new pollutants. However, existing convection heat transfer structures cannot regulate the temperature of the discharged flue gas, thus posing a risk that the discharged flue gas temperature may be too high or too low, making it unsuitable for denitrification and ultimately resulting in emissions that do not meet environmental requirements. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a convective heat exchange structure with adjustable outlet flue gas temperature. It can adjust the temperature of the discharged flue gas to a temperature suitable for denitrification, thereby helping the emission of flue gas to meet environmental protection requirements.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a convection heat exchange structure with adjustable outlet flue gas temperature, including a furnace body, a first convection section serpentine tube, a second convection section serpentine tube, a third convection section serpentine tube, a first ash hopper, a second ash hopper, a connecting pipe, and a regulating valve.

[0005] The furnace body is provided with a first convection chamber, a second convection chamber, a third convection chamber, and a flue gas inlet communicating with the first convection chamber. The first convection section serpentine tube is provided in the first convection chamber, the second convection section serpentine tube is provided in the second convection chamber, and the third convection section serpentine tube is provided in the third convection chamber. The upper end of the second convection chamber is connected to the upper end of the third convection chamber.

[0006] The first ash hopper and the second ash hopper are connected to the furnace body and located below the furnace body. The lower ends of the first convection chamber and the second convection chamber are respectively connected to the first ash hopper. The lower end of the third convection chamber is connected to the second ash hopper. The second ash hopper is provided with a smoke outlet.

[0007] One end of the connecting pipe is connected to the first ash hopper, and the other end of the connecting pipe is connected to the second ash hopper. The regulating valve is installed in the connecting pipe.

[0008] Furthermore, the convective heat transfer structure with adjustable outlet flue gas temperature also includes an oil inlet pipe, an oil outlet pipe, and an inlet manifold;

[0009] The inlet ends of the first convection section coil, the second convection section coil, and the third convection section coil are all connected to the oil inlet pipe.

[0010] The outlet ends of the first convection section coil, the second convection section coil, and the third convection section coil are all connected to the oil outlet pipe.

[0011] The oil inlet pipe is connected to the inlet manifold, which is used to connect the heat transfer oil.

[0012] Furthermore, to prevent ash blockage, the first convection section serpentine tube, the second convection section serpentine tube, and the third convection section serpentine tube are all made of furnace tubes.

[0013] The furnace tube gap in the first convection section of the serpentine tube is larger than the furnace tube gap in the second convection section of the serpentine tube;

[0014] The gap between the furnace tubes in the second convection section of the serpentine tube is larger than the gap between the furnace tubes in the third convection section of the serpentine tube.

[0015] Furthermore, to facilitate ash removal, the side of the furnace body is provided with a first ash removal door communicating with the first convection chamber, a second ash removal door communicating with the second convection chamber, and a third ash removal door communicating with the third convection chamber.

[0016] Furthermore, to facilitate ash removal, the top of the furnace body is provided with a top ash removal door that communicates with the first convection chamber.

[0017] Furthermore, the first convection chamber, the second convection chamber, and the third convection chamber are arranged in sequence, with a first partition between the first convection chamber and the second convection chamber, and a second partition between the second convection chamber and the third convection chamber.

[0018] Furthermore, the convective heat transfer structure with adjustable outlet flue gas temperature also includes a rigid frame, on which the furnace body is mounted.

[0019] Furthermore, to prevent heat loss, the furnace body is equipped with a layer of heat-insulating material.

[0020] Furthermore, a temperature sensor is installed in the smoke outlet to detect the exhaust temperature.

[0021] Using the above technical solution, high-temperature flue gas flows from the inlet into the first convection chamber, then sequentially into the first ash hopper, the second convection chamber, the third convection chamber, and the second ash hopper, finally exiting from the outlet. The flue gas exiting from the outlet can then enter the denitrification device for denitrification. In the first convection chamber, the flue gas transfers heat to the heat transfer oil in the first convection section of the serpentine coil; in the second convection chamber, the flue gas transfers heat to the heat transfer oil in the second convection section of the serpentine coil; and in the third convection chamber, the flue gas transfers heat to the heat transfer oil in the third convection section of the serpentine coil. Therefore, the temperature of the flue gas gradually decreases during its flow, resulting in a higher temperature for the flue gas in the first ash hopper compared to the second ash hopper. When the regulating valve is opened, the flue gas in the first ash hopper flows directly into the second ash hopper through the connecting pipe and mixes with the flue gas in the second ash hopper, thus raising the temperature of the flue gas exiting from the outlet. At this time, when the temperature of the flue gas discharged from the flue outlet is too high, the opening of the regulating valve can be reduced to decrease the amount of flue gas flowing directly from the first ash hopper into the second ash hopper, thereby lowering the temperature of the flue gas discharged from the flue outlet. Conversely, when the temperature of the flue gas discharged from the flue outlet is too low, the opening of the regulating valve can be increased to increase the amount of flue gas flowing directly from the first ash hopper into the second ash hopper, thereby raising the temperature of the flue gas discharged from the flue outlet. Therefore, by adjusting the opening of the regulating valve, the temperature of the flue gas discharged from the flue outlet can be regulated, thereby adjusting the flue gas temperature to a suitable temperature for denitrification, allowing the flue gas to undergo denitrification fully and efficiently in the denitrification device, thus helping to ensure that the emission of flue gas meets environmental protection requirements. Attached Figure Description

[0022] Figure 1 This is a front sectional view of the convective heat transfer structure with adjustable outlet flue gas temperature of this utility model.

[0023] Figure 2 This is a top view of the convective heat transfer structure with adjustable outlet flue gas temperature of this utility model.

[0024] In the diagram: 1. Furnace body; 2. First convection section serpentine tube; 3. Second convection section serpentine tube; 4. Third convection section serpentine tube; 5. First ash hopper; 6. Second ash hopper; 7. Connecting pipe; 8. Regulating valve; 9. First convection chamber; 10. Second convection chamber; 11. Third convection chamber; 12. Smoke inlet; 13. Smoke outlet; 14. Oil inlet pipe; 15. Oil outlet pipe; 16. Inlet manifold; 17. First ash cleaning door; 18. Second ash cleaning door; 19. Third ash cleaning door; 20. Top ash cleaning door; 21. First baffle; 22. Second baffle; 23. Rigid frame. Detailed Implementation

[0025] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] like Figure 1 , 2 As shown, a convective heat exchange structure with adjustable outlet flue gas temperature includes a furnace body 1, a first convection section serpentine tube 2, a second convection section serpentine tube 3, a third convection section serpentine tube 4, a first ash hopper 5, a second ash hopper 6, a connecting pipe 7, and a regulating valve 8.

[0027] The furnace body 1 is provided with a first convection chamber 9, a second convection chamber 10, a third convection chamber 11, and a flue gas inlet 12 communicating with the first convection chamber 9. The first convection section serpentine tube 2 is provided in the first convection chamber 9, the second convection section serpentine tube 3 is provided in the second convection chamber 10, and the third convection section serpentine tube 4 is provided in the third convection chamber 11. The upper end of the second convection chamber 10 is connected to the upper end of the third convection chamber 11.

[0028] The first ash hopper 5 and the second ash hopper 6 are connected to the furnace body 1 and located below the furnace body 1. The lower end of the first convection chamber 9 and the lower end of the second convection chamber 10 are respectively connected to the first ash hopper 5. The lower end of the third convection chamber 11 is connected to the second ash hopper 6. The second ash hopper 6 is provided with a smoke outlet 13.

[0029] One end of the connecting pipe 7 is connected to the first ash hopper 5, and the other end of the connecting pipe 7 is connected to the second ash hopper 6. The regulating valve 8 is installed in the connecting pipe 7.

[0030] Specifically, high-temperature flue gas flows into the first convection chamber 9 from the inlet 12, then sequentially into the first ash hopper 5, the second convection chamber 10, the third convection chamber 11, and the second ash hopper 6, finally exiting from the outlet 13. The flue gas exiting from the outlet 13 can then enter the denitrification device for denitrification. In the first convection chamber 9, the flue gas transfers heat to the heat transfer oil in the first convection section serpentine tube 2; in the second convection chamber 10, it transfers heat to the heat transfer oil in the second convection section serpentine tube 3; and in the third convection chamber 11, it transfers heat to the heat transfer oil in the third convection section serpentine tube 4. Therefore, the temperature of the flue gas gradually decreases during its flow, resulting in a higher temperature for the flue gas in the first ash hopper 5 compared to the second ash hopper 6. When the regulating valve 8 is opened, the flue gas in the first ash hopper 5 flows directly into the second ash hopper 6 through the connecting pipe 7, mixing with the flue gas in the second ash hopper 6 and causing the temperature of the flue gas exiting from the outlet 13 to rise. At this time, when the temperature of the flue gas discharged from the flue outlet 13 is too high, the opening of the regulating valve 8 can be reduced to decrease the amount of flue gas flowing directly from the first ash hopper 5 into the second ash hopper 6, thereby lowering the temperature of the flue gas discharged from the flue outlet 13. Conversely, when the temperature of the flue gas discharged from the flue outlet 13 is too low, the opening of the regulating valve 8 can be increased to increase the amount of flue gas flowing directly from the first ash hopper 5 into the second ash hopper 6, thereby raising the temperature of the flue gas discharged from the flue outlet 13. Therefore, by adjusting the opening of the regulating valve 8, the temperature of the flue gas discharged from the flue outlet 13 can be adjusted, thereby adjusting the flue gas temperature to a suitable temperature for denitrification, allowing the flue gas to undergo denitrification fully and efficiently in the denitrification device, thus helping to ensure that the emission of flue gas meets environmental protection requirements.

[0031] like Figure 1 , 2 As shown, the convective heat transfer structure with adjustable outlet flue gas temperature may also include an oil inlet pipe 14, an oil outlet pipe 15, and an inlet manifold 16.

[0032] The inlet ends of the first convection section serpentine tube 2, the second convection section serpentine tube 3, and the third convection section serpentine tube 4 are all connected to the oil inlet pipe 14.

[0033] The outlet ends of the first convection section serpentine tube 2, the second convection section serpentine tube 3, and the third convection section serpentine tube 4 are all connected to the oil outlet pipe 15.

[0034] The oil inlet pipe 14 is connected to the inlet manifold 16, which is used to connect the heat transfer oil. Specifically, the heat transfer oil is first connected to the inlet manifold 16, and then flows from the inlet manifold 16 into the oil inlet pipe 14. The heat transfer oil in the oil inlet pipe 14 then flows into the first convection section serpentine tube 2, the second convection section serpentine tube 3, and the third convection section serpentine tube 4, respectively. Finally, the heat transfer oil in the first convection section serpentine tube 2, the second convection section serpentine tube 3, and the third convection section serpentine tube 4 converges into the oil outlet pipe 15 and is then discharged.

[0035] like Figure 1 , 2 As shown, the first convection section serpentine tube 2, the second convection section serpentine tube 3, and the third convection section serpentine tube 4 are all wound from furnace tubes. The furnace tube gap in the first convection section serpentine tube 2 is larger than the furnace tube gap in the second convection section serpentine tube 3, and the furnace tube gap in the second convection section serpentine tube 3 is larger than the furnace tube gap in the third convection section serpentine tube 4. Specifically, among the first convection chamber 9, the second convection chamber 10, and the third convection chamber 11, the flue gas temperature is highest in the first convection chamber 9. Therefore, the temperature of the soot carried by the flue gas in the first convection chamber 9 is the highest, and thus the soot in the first convection section serpentine tube 9 is most likely to adhere to the first convection section serpentine tube 2, causing ash blockage. Therefore, the furnace tube gap in the first convection section serpentine tube 2 needs to be set larger to prevent ash blockage. The flue gas temperature is lowest in the third convection chamber 11, so the temperature of the soot carried by the flue gas in the third convection chamber 11 is also the lowest. Therefore, the soot in the third convection chamber 11 is not easy to adhere to the third convection section serpentine tube 4 and is not easy to cause ash blockage. Therefore, the furnace tube gap in the third convection section serpentine tube 4 can be set smaller.

[0036] like Figure 1 , 2 As shown, the side of the furnace body 1 is provided with a first ash cleaning door 17 communicating with the first convection chamber 9, a second ash cleaning door 18 communicating with the second convection chamber 10, and a third ash cleaning door 19 communicating with the third convection chamber 11. The top of the furnace body 1 is provided with a top ash cleaning door 20 communicating with the first convection chamber 9. Specifically, the first convection section serpentine tube 2 can be cleaned through the first ash cleaning door 17 and the top ash cleaning door 20, the second convection section serpentine tube 3 can be cleaned through the second ash cleaning door 18, and the third convection section serpentine tube 4 can be cleaned through the third ash cleaning door 19, thereby greatly facilitating the ash cleaning operation.

[0037] like Figure 1 , 2 As shown, the first convection chamber 9, the second convection chamber 10 and the third convection chamber 11 are arranged in sequence. A first partition 21 is provided between the first convection chamber 9 and the second convection chamber 10, and a second partition 22 is provided between the second convection chamber 10 and the third convection chamber 11.

[0038] like Figure 1 , 2 As shown, the convective heat transfer structure with adjustable outlet flue gas temperature may also include a rigid frame 23, the furnace body 1 is installed on the rigid frame 23, the furnace body 1 is provided with a heat insulation material layer to prevent heat loss, and the flue gas outlet 13 is provided with a temperature sensor to detect the temperature of the discharged flue gas.

[0039] In summary, the high-temperature flue gas flows from the inlet 12 into the first convection chamber 9, then sequentially into the first ash hopper 5, the second convection chamber 10, the third convection chamber 11, and the second ash hopper 6, finally exiting from the outlet 13. The flue gas exiting from the outlet 13 can then enter the denitrification device for denitrification. In the first convection chamber 9, the flue gas transfers heat to the heat transfer oil in the first convection section serpentine tube 2; in the second convection chamber 10, it transfers heat to the heat transfer oil in the second convection section serpentine tube 3; and in the third convection chamber 11, it transfers heat to the heat transfer oil in the third convection section serpentine tube 4. Therefore, the temperature of the flue gas gradually decreases during its flow, resulting in a higher temperature for the flue gas in the first ash hopper 5 compared to the second ash hopper 6. When the regulating valve 8 is opened, the flue gas in the first ash hopper 5 flows directly into the second ash hopper 6 through the connecting pipe 7, mixing with the flue gas in the second ash hopper 6 and causing the temperature of the flue gas exiting from the outlet 13 to rise. At this time, when the temperature of the flue gas discharged from the flue outlet 13 is too high, the opening of the regulating valve 8 can be reduced to decrease the amount of flue gas flowing directly from the first ash hopper 5 into the second ash hopper 6, thereby lowering the temperature of the flue gas discharged from the flue outlet 13. Conversely, when the temperature of the flue gas discharged from the flue outlet 13 is too low, the opening of the regulating valve 8 can be increased to increase the amount of flue gas flowing directly from the first ash hopper 5 into the second ash hopper 6, thereby raising the temperature of the flue gas discharged from the flue outlet 13. Therefore, by adjusting the opening of the regulating valve 8, the temperature of the flue gas discharged from the flue outlet 13 can be adjusted, thereby adjusting the flue gas temperature to a suitable temperature for denitrification, allowing the flue gas to undergo denitrification fully and efficiently in the denitrification device, thus helping to ensure that the emission of flue gas meets environmental protection requirements.

[0040] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A convective heat transfer structure with adjustable outlet flue gas temperature, characterized in that, It includes a furnace body (1), a first convection section serpentine tube (2), a second convection section serpentine tube (3), a third convection section serpentine tube (4), a first ash hopper (5), a second ash hopper (6), a connecting pipe (7), and a regulating valve (8); The furnace body (1) is provided with a first convection chamber (9), a second convection chamber (10), a third convection chamber (11) and a flue gas inlet (12) connected to the first convection chamber (9). The first convection section serpentine tube (2) is located in the first convection chamber (9), the second convection section serpentine tube (3) is located in the second convection chamber (10), and the third convection section serpentine tube (4) is located in the third convection chamber (11). The upper end of the second convection chamber (10) is connected to the upper end of the third convection chamber (11). The first ash hopper (5) and the second ash hopper (6) are connected to the furnace body (1) and located below the furnace body (1). The lower end of the first convection chamber (9) and the lower end of the second convection chamber (10) are respectively connected to the first ash hopper (5). The lower end of the third convection chamber (11) is connected to the second ash hopper (6). The second ash hopper (6) is provided with a smoke outlet (13). One end of the connecting pipe (7) is connected to the first ash hopper (5), and the other end of the connecting pipe (7) is connected to the second ash hopper (6). The regulating valve (8) is installed in the connecting pipe (7).

2. The convective heat transfer structure with adjustable outlet flue gas temperature according to claim 1, characterized in that, It also includes an oil inlet pipe (14), an oil outlet pipe (15), and an inlet manifold (16). The inlet end of the first convection section serpentine tube (2), the inlet end of the second convection section serpentine tube (3), and the inlet end of the third convection section serpentine tube (4) are all connected to the oil inlet pipe (14); The outlet end of the first convection section serpentine tube (2), the outlet end of the second convection section serpentine tube (3), and the outlet end of the third convection section serpentine tube (4) are all connected to the oil outlet pipe (15). The oil inlet pipe (14) is connected to the inlet manifold (16), which is used to connect heat transfer oil.

3. The convective heat transfer structure with adjustable outlet flue gas temperature according to claim 1, characterized in that, The first convection section serpentine tube (2), the second convection section serpentine tube (3) and the third convection section serpentine tube (4) are all made of furnace tubes; The gap between the furnace tubes in the first convection section serpentine tube (2) is greater than the gap between the furnace tubes in the second convection section serpentine tube (3); The gap between the furnace tubes in the second convection section (3) is greater than the gap between the furnace tubes in the third convection section (4).

4. The convective heat transfer structure with adjustable outlet flue gas temperature according to claim 1, characterized in that, The side of the furnace body (1) is provided with a first ash removal door (17) communicating with the first convection chamber (9), a second ash removal door (18) communicating with the second convection chamber (10), and a third ash removal door (19) communicating with the third convection chamber (11).

5. The convective heat transfer structure with adjustable outlet flue gas temperature according to claim 1, characterized in that, The top of the furnace body (1) is provided with a top ash removal door (20) that communicates with the first convection chamber (9).

6. The convective heat transfer structure with adjustable outlet flue gas temperature according to claim 1, characterized in that, The first convection chamber (9), the second convection chamber (10) and the third convection chamber (11) are arranged in sequence. A first partition (21) is provided between the first convection chamber (9) and the second convection chamber (10), and a second partition (22) is provided between the second convection chamber (10) and the third convection chamber (11).

7. The convective heat transfer structure with adjustable outlet flue gas temperature according to claim 1, characterized in that, It also includes a rigid frame (23), on which the furnace body (1) is mounted.

8. The convective heat transfer structure with adjustable outlet flue gas temperature according to claim 1, characterized in that, The furnace body (1) is provided with a heat insulation material layer.

9. The convective heat transfer structure with adjustable outlet flue gas temperature according to claim 1, characterized in that, A temperature sensor is provided in the smoke outlet (13).

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