A flue gas reheating device

Abstract

The utility model discloses a flue gas reheating device, including inner tube body and outer tube body, and the outer tube body is sleeved on the outside of inner tube body, and the inside of inner tube body forms first smoke cavity, and the between of inner tube body and outer tube body forms second smoke cavity, and the left and right ends of inner tube body and outer tube body are fixedly connected with flange plate, and the left and right ends of flange plate form the closed of second smoke cavity, and two pipe joints are connected and installed on the outer tube body, and the left and right ends of first smoke cavity are open, and the utility model designs the first smoke cavity of inside to the standard flue gas after lye washing, and the high temperature flue gas before lye washing goes to the second smoke cavity outside, and the reheating demand of standard flue gas is formed through the heat exchange effect between the inside and outside two smoke cavities, and the utility model utilizes original heat resource to reheat standard flue gas, and both satisfy the flue gas reheating demand, and do not increase system energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, and more specifically, to a flue gas reheating device. Background Technology

[0002] Hazardous waste incineration is a process that reduces waste volume and utilizes resources through high-temperature decomposition and oxidation. This process generates a large amount of flue gas, which requires a series of subsequent treatments to meet emission standards. The alkaline scrubbing tower is the final step in flue gas treatment. After deacidification, the flue gas meets emission standards and can be discharged through a chimney. However, actual production revealed that the temperature of the flue gas output from the alkaline scrubbing tower is only 70-80℃, and small water droplets condense within it. Directly discharging this flue gas through the chimney would negatively impact the lifespan of the equipment. Furthermore, the emitted flue gas appears as dense white smoke, which is visually unpleasant and could cause panic among nearby residents (even though the flue gas meets emission standards). To address these issues, the company considered reheating the flue gas output from the alkaline scrubbing tower, leading to this case study. Utility Model Content

[0003] The purpose of this invention is to address the needs of the prior art and provide a flue gas reheating device. This invention designs the compliant flue gas after alkaline washing to flow into the internal first flue chamber, while the high-temperature flue gas before alkaline washing flows into the external second flue chamber. The reheating demand for the compliant flue gas is achieved through the heat exchange effect between the two flue chambers. This invention utilizes existing heat resources to reheat the compliant flue gas, thus satisfying the flue gas reheating demand without increasing system energy consumption.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A flue gas reheating device includes an inner tube and an outer tube. The outer tube is fitted onto the outside of the inner tube. A first flue gas chamber is formed inside the inner tube. A second flue gas chamber is formed between the inner tube and the outer tube. Flanges are fixedly connected to both the left and right ends of the inner and outer tubes. The flanges seal the left and right ends of the second flue gas chamber. Two pipe joints are connected and installed on the outer tube. The left and right ends of the first flue gas chamber are open.

[0006] Furthermore, the two pipe joints are symmetrically connected to the left and right ends of the outer pipe body, respectively, and the pipe joints are connected to the second smoke chamber.

[0007] Furthermore, the second smoke chamber is filled with high-temperature flue gas, and an insulation layer is formed on the outer side of the outer tube.

[0008] Furthermore, the first smoke chamber is filled with low-temperature compliant flue gas, and the inner tube is equipped with a smoke control structure, which includes a spiral blade assembly and a support plate. The spiral blade assembly is installed inside the first smoke chamber, and the two support plates are respectively installed on two flanges. The two ends of the spiral blade assembly are supported and connected to the two support plates.

[0009] Furthermore, the helical blade assembly includes a horizontal shaft and helical blades, the helical blades being fixedly connected to the outer wall of the horizontal shaft, and the outer diameter of the helical blades matching the diameter of the first smoke chamber.

[0010] Furthermore, each of the left and right ends of the horizontal shaft is connected to a shaft head, and the flange has an inner groove. The two support plates are respectively matched and installed in the inner grooves of the two flanges. A shaft seat is connected to one side of the support plate, and the two shaft heads of the horizontal shaft are respectively inserted into the shaft seats connected to the two support plates.

[0011] Furthermore, the surface of the support plate is flush with the surface of the flange, and a sealing groove is formed on the surface of the flange, in which a sealing ring is installed.

[0012] Furthermore, the support plate has several circumferentially distributed through holes, which keep the left and right ends of the first smoke chamber open.

[0013] The beneficial effects of this utility model are:

[0014] 1. The present invention has a reasonable structural design. The qualified flue gas after alkaline washing goes through the first internal flue chamber, while the high-temperature flue gas before alkaline washing goes through the second external flue chamber. The heat exchange effect between the two flue chambers creates the reheating demand for the qualified flue gas. The present invention utilizes the original heat resources to reheat the qualified flue gas, which satisfies the reheating demand of the flue gas without increasing the system energy consumption, thus achieving a win-win effect.

[0015] 2. This utility model installs a smoke control structure in the first smoke chamber, which forms a tortuous smoke channel through spiral blades. This design lengthens the travel distance of the qualified smoke, allowing the qualified smoke to be fully heated. The smoke control structure of this utility model has the advantage of being easy to assemble and disassemble. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a flue gas reheat device in this embodiment;

[0017] Figure 2 This is a front view of the support plate in this embodiment;

[0018] Figure 3 This is a schematic diagram illustrating the application principle of a flue gas reheat device in this embodiment.

[0019] Reference numerals: Inner pipe 1, Outer pipe 2, Pipe joint 21, Insulation layer 22, First smoke chamber 3, Second smoke chamber 4, Flange 5, Inner groove 51, Sealing groove 52, Sealing ring 53, Smoke control structure 6, Spiral blade assembly 61, Horizontal shaft 611, Spiral blade 612, Shaft head 613, Support plate 62, Shaft seat 621, Through hole 622, Flue gas reheat device 100, Alkali scrubbing spray tower 200, Exhaust fan 300, Chimney device 400. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 and Figure 2 The flue gas reheating device shown includes an inner tube 1 and an outer tube 2. The outer tube 2 is fitted onto the outside of the inner tube 1. A first flue gas chamber 3 is formed inside the inner tube 1. A gap is left between the inner tube 1 and the outer tube 2, forming a second flue gas chamber 4. Flanges 5 are fixedly connected to both ends of the inner tube 1 and the outer tube 2. The flanges 5 are welded to the left and right ends of the inner tube 1 and the outer tube 2, thus sealing the left and right ends of the second flue gas chamber 4. However, the flanges 5 do not affect the first flue gas chamber 3, leaving the left and right ends of the first flue gas chamber 3 open. The flanges 5 serve as a pipe connection. This flue gas reheating device can be directly applied to flue gas emission pipelines. The first flue gas chamber 3 is used for low-temperature reheating. The second smoke chamber 4 is used to pass high-temperature flue gas for heat exchange. Two pipe joints 21 are connected and installed on the outer pipe body 2. The two pipe joints 21 are symmetrically connected to the left and right ends of the outer pipe body 2, respectively. The pipe joints 21 are connected to the second smoke chamber 4 and the high-temperature flue gas pipeline. One pipe joint 21 is used to input high-temperature flue gas and the other pipe joint 21 is used to output high-temperature flue gas. The inner pipe body 1 of this utility model is made of a material with good thermal conductivity. The second smoke chamber 4 and the first smoke chamber 3 form a heat exchange effect, so that the qualified flue gas passing through the first smoke chamber 3 is reheated. The heating target is to reach 120-130℃, which can eliminate small water droplets in the flue gas and change the emitted flue gas from white smoke to colorless smoke.

[0022] like Figure 1 As shown, in order to ensure that the high temperature heat of the second smoke chamber 4 is not wasted, an insulation layer 22 is formed on the outside of the outer tube 2. The insulation layer 22 is made of insulation material, such as insulation cloth, which is convenient for direct wrapping and installation.

[0023] To ensure that the reheat temperature of the compliant flue gas reaches 120-130℃, this invention features a special design for the first flue chamber 3, such as... Figure 1 As shown, the inner tube 1 is equipped with a smoke control structure 6, which includes a spiral blade assembly 61 and a support plate 62. The spiral blade assembly 61 is installed in the first smoke chamber 3, and the two support plates 62 are respectively installed on two flanges 5. The two ends of the spiral blade assembly 61 are supported and connected to the two support plates 62. The support plates 62 play a supporting and limiting role for the spiral blade assembly 61. The spiral blade assembly 61 includes a horizontal shaft 611 and a spiral blade 612. The spiral blade 612 is fixedly connected to the outer wall of the horizontal shaft 611. The outer diameter of the spiral blade 612 matches the diameter of the first smoke chamber 3. The spiral blade 612 extends along the length of the first smoke chamber 3, forming a spiral-forward flue in the first smoke chamber 3. This can effectively extend the passage of the qualified flue gas, so that the qualified flue gas can be fully heated and ensure that it reaches the temperature target of 120-130℃.

[0024] like Figure 1 As shown, a shaft head 613 is connected to both ends of the horizontal shaft 611. An inner groove 51 is provided on the flange 5. Two support plates 62 are respectively matched and installed in the inner grooves 51 of the two flanges 5. After installation, the surface of the support plate 62 is flush with the surface of the flange 5 to avoid affecting the sealing connection between the present invention and the pipeline. After connection with the pipeline, the support plate 62 is pressed and fixed, and the support plate 62 serves to limit the position of the spiral blade assembly 61. A shaft seat 621 is connected to one side of the support plate 62. The two shaft heads 613 of the horizontal shaft 611 are respectively inserted into the shaft seats 621 of the two support plates 62. The support plate 62 and the spiral blade assembly 61 adopt an insert connection mode, which facilitates installation and disassembly. A sealing groove 52 is provided on the surface of the flange 5, and a sealing ring 53 is installed in the sealing groove 52. The sealing ring 53 can form a sealing effect at the pipeline connection. Figure 2 As shown, the support plate 62 has several circumferentially distributed through holes 622, which keep the left and right ends of the first smoke chamber 3 open so that the standard smoke can circulate.

[0025] Example:

[0026] like Figure 3The diagram shows the system application of the flue gas reheating device 100 of this invention. The original temperature of the qualified flue gas output from the alkaline scrubbing spray tower 200 is 70-80℃. It is drawn by the induced draft fan 300 to the chimney device 400 for discharge, and the emission is white smoke. Currently, the flue gas reheating device 100 is installed on the pipeline from the outlet of the alkaline scrubbing spray tower 200 to the induced draft fan 300. The original temperature of the flue gas entering the alkaline scrubbing spray tower 200 is 180-190℃, which meets the requirements of a high-temperature heat source and can be used to reheat the qualified flue gas. Therefore, the current practice is to maintain a temperature of 180-190℃. The high-temperature flue gas does not directly enter the alkaline scrubbing spray tower 200. Instead, it is first diverted to the flue gas reheating device 100, where it is reheated to meet the standards by passing through the 180-190°C high-temperature flue gas. After reheating, the compliant flue gas reaches 120-130°C and is converted into colorless smoke during emission, meeting the usage requirements. The high-temperature flue gas used for heat exchange is still around 150°C after being utilized by the flue gas reheating device 100. The flue gas reheating device 100 diverts this part of the flue gas pipeline to the alkaline scrubbing spray tower 200. This temperature of flue gas does not affect the normal processing operation within the alkaline scrubbing spray tower 200.

[0027] This invention utilizes the high-temperature flue gas in the original treatment system as a heat source to reheat the qualified flue gas, which satisfies the flue gas reheating requirements without increasing the system energy consumption, achieving a win-win effect.

[0028] This invention also has the advantage of convenient maintenance. When cleaning the second smoke chamber 4, the inlet and outlet water pipes can be directly connected to the pipe joint 21, and high-pressure water can be used for cleaning inside the chamber. After this invention is disconnected from the pipe, the support plate 62 and the spiral blade assembly 61 can be quickly disassembled and separated, which is beneficial to the cleaning operation of the spiral blade assembly 61 and the first smoke chamber 3.

[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A flue gas reheating device, characterized by, It includes an inner tube (1) and an outer tube (2). The outer tube (2) is fitted onto the outside of the inner tube (1). A first smoke chamber (3) is formed inside the inner tube (1). A second smoke chamber (4) is formed between the inner tube (1) and the outer tube (2). Flanges (5) are fixedly connected to both the left and right ends of the inner tube (1) and the outer tube (2). The flanges (5) seal the left and right ends of the second smoke chamber (4). Two pipe joints (21) are connected and installed on the outer tube (2). The left and right ends of the first smoke chamber (3) are open.

2. The flue gas reheating device according to claim 1, characterized in that, The two pipe joints (21) are symmetrically connected to the left and right ends of the outer pipe body (2), and the pipe joints (21) are connected to the second smoke chamber (4).

3. The flue gas reheating device according to claim 1, characterized in that, The second smoke chamber (4) is filled with high-temperature flue gas, and an insulation layer (22) is formed on the outside of the outer tube (2).

4. The flue gas reheating device according to claim 1, characterized in that, The first smoke chamber (3) is filled with low-temperature compliant flue gas. The inner tube (1) is equipped with a smoke control structure (6). The smoke control structure (6) includes a spiral blade assembly (61) and a support plate (62). The spiral blade assembly (61) is installed in the first smoke chamber (3). The two support plates (62) are respectively installed on two flanges (5). The two ends of the spiral blade assembly (61) are supported and connected to the two support plates (62).

5. The flue gas reheating device according to claim 4, characterized in that, The spiral blade assembly (61) includes a horizontal shaft (611) and a spiral blade (612). The spiral blade (612) is fixedly connected to the outer wall of the horizontal shaft (611), and the outer diameter of the spiral blade (612) matches the diameter of the first smoke chamber (3).

6. The flue gas reheating device according to claim 5, characterized in that, The horizontal shaft (611) is connected to a shaft head (613) at both ends. The flange (5) has an inner groove (51). The two support plates (62) are respectively matched and installed in the inner grooves (51) of the two flanges (5). A bearing seat (621) is connected to one side of the support plate (62). The two shaft heads (613) of the horizontal shaft (611) are respectively inserted into the bearing seats (621) connected to the two support plates (62).

7. The flue gas reheating device according to claim 4, characterized in that, The surface of the support plate (62) is flush with the surface of the flange (5). A sealing groove (52) is provided on the surface of the flange (5), and a sealing ring (53) is installed in the sealing groove (52).

8. The flue gas reheating device according to claim 4, characterized in that, The support plate (62) has several circumferentially distributed through holes (622) to keep the left and right ends of the first smoke chamber (3) open.

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