Heating furnace with waste gas treatment function and treatment method
By using the technology of using the burner to spray flame and gear meshing in the heating furnace to control the flame shape, the problems of uneven heating and pipe aging in the tube heating furnace are solved, achieving a more uniform heating effect and a longer service life.
Patent Information
- Application Number
- CN202411939852.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-04-15
AI Technical Summary
The existing tube heating furnace has internal heat uneven during the heating process, which leads to the inability to fully decompose and convert toxic and harmful substances in the exhaust gas. At the same time, the flame and pipes are in contact with each other for a long time to accelerate aging and shorten their service life.
A heating furnace with exhaust gas treatment function was designed. The internal heating furnace inside the main body of the tube heating furnace was heated by a burner, and the heating effect was more uniform. The flame shape was controlled through the meshing of the gears and the tooth plates to avoid direct high-temperature flames from the pipe.
It achieves uniform distribution of heat during heating, extends the service life of the pipeline, improves the efficiency of waste gas treatment, and reduces the risk of product deformation and cracking.
Smart Images
Figure CN119826539A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of heating furnaces, and in particular relates to a heating furnace with a waste gas treatment function and a treatment method. Background Art
[0002] In the metallurgical industry, a heating furnace is a device that heats materials or workpieces to the rolling and forging temperature; heating furnaces are used in many industries such as petroleum, chemical industry, metallurgy, machinery, heat treatment, surface treatment, building materials, electronics, materials, light industry, daily chemicals, and pharmaceuticals; heating furnaces are mainly divided into gas heating furnaces, oil heating furnaces, resistance heating furnaces, induction heating furnaces, and tubular heating furnaces, among which tubular heating furnaces are a direct heating type of heating equipment, mainly used for heating liquid or gas chemical raw materials. Its heat transfer method is mainly radiation heat transfer, and is widely used in industries such as petroleum refining, petrochemicals, coal chemicals, tar processing, and crude oil transportation.
[0003] First of all, in the existing tubular heating furnace, high-temperature flue gas is usually generated by burning fuel during the heating process, and the flue gas is used to conduct heat through the furnace tube to heat the material to be heated to the required temperature. In this process, the flame of the burning fuel will contact the internal pipes, and the pipes in contact with the flame will have a higher temperature when heated, while the pipes away from the flame will have a lower temperature when heated, which will cause uneven heating inside the tubular heating furnace during heating. When materials, waste gas and other materials are heated and processed, uneven heating may occur, making it impossible to fully decompose and transform some toxic and harmful substances in the waste gas. At the same time, the temperature at the position in contact with the flame is more likely to cause the aging degree of the pipe in contact with the flame to increase, shortening its service life. Summary of the invention The object of the present invention is to provide a heating furnace with waste gas treatment function and a treatment method to solve the problems raised in the above background technology.
[0004] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a heating furnace with an exhaust gas treatment function, comprising a tubular heating furnace main body, a convection chamber fixedly connected to the middle of the top of the tubular heating furnace main body, two smoke outlets fixedly connected to both sides of the top of the convection chamber, an air inlet fixedly connected to one side of the convection chamber, and an air outlet fixedly connected to the other side of the convection chamber, two driving motors fixedly connected to both sides of the bottom of the tubular heating furnace main body, the output ends of the two driving motors are fixedly connected to a first rotating shaft, a first sprocket is fixedly sleeved on the outer side of the top of the first rotating shaft, a second rotating shaft is arranged on one side of the first sprocket, the second rotating shaft is rotatably connected to the tubular heating furnace main body, a second sprocket is fixedly sleeved on the outer side of the top of the second rotating shaft, a chain is sleeved on the outer sides of the first sprocket and the second sprocket, the first sprocket and the second sprocket are connected to each other through the chain, and a flame arrester assembly is arranged inside the tubular heating furnace main body.
[0005] Preferably, a first support plate is provided above the chain, the first support plate is fixedly connected to the tubular heating furnace body, an annular slide groove is provided inside the first support plate, and two support blocks are fixedly connected to both sides of the bottom of the first support plate.
[0006] Preferably, the flame arresting assembly comprises a plurality of connecting blocks, each of which is fixedly connected to a chain, a burner is fixedly connected to the top of the connecting block, a flame guide ring is fixedly connected to the top of the burner, and a fixing column is fixedly connected to the middle of the burner.
[0007] Preferably, the flame-blocking assembly also includes a gear, which is movably sleeved on the outer side of the fixed column, a plurality of tooth plates are arranged inside the main body of the tubular heating furnace, a plurality of limiting grooves are opened in the tooth plates, a fixed shaft sleeve is arranged at the bottom of the gear, the fixed shaft sleeve is fixedly sleeved with the fixed column, a plurality of second support plates are sleeved on the outer side of the fixed shaft sleeve, a plurality of push rods are slidably connected inside the second support plate, a plurality of connecting columns are fixedly connected to one side of the top of the plurality of push rods, a plurality of limiting columns are arranged on the outer side of the fixed column, a plurality of springs are movably sleeved on the outer side of the limiting columns, one end of the spring is fixedly connected to the fixed column, the other end of the plurality of springs is fixedly connected to a flame-blocking plate, and one side of the plurality of flame-blocking plates is hinged to the fixed column.
[0008] Preferably, the width of the annular groove is greater than the width of the connecting block, and the connecting block will not touch the first supporting plate when moving in the arc of the annular groove.
[0009] Preferably, the plurality of tooth plates are arranged corresponding to the arc of the annular slide groove, and the number of teeth of the tooth plates matches the number of teeth of the gear.
[0010] Preferably, the plurality of connecting posts are all arranged corresponding to the limiting grooves, and the plurality of connecting posts are slidably connected inside the limiting grooves.
[0011] Preferably, the height of the gear is higher than the height of the flame-blocking plate, and the push rod contacts the flame-blocking plate when being ejected.
[0012] Preferably, the bottom of the burner is flush with the first support plate, and the first support plate can support the burner.
[0013] A method for treating a heating furnace with an exhaust gas treatment function comprises the following steps: S1. Inputting the exhaust gas into the convection chamber and the interior of the tubular heating furnace body through the air inlet; S2, starting the drive motor and the burner, the drive motor drives the burner to rotate, and the burner rotates to spray flames to heat the pipe inside the tubular heating furnace body; S3. At this time, the rotation of the burner causes the gear to mesh with the tooth plate during the rotation process, controlling the shape of the flame ejection, thereby achieving uniform heating; S4. After the inside of the pipe is heated to a sufficient temperature, the exhaust gas is heated and purified through the main body of the tubular heating furnace and the internal pipe of the convection chamber, and the exhaust gas is treated and discharged from the outlet after the treatment is completed.
[0014] The beneficial effects of the present invention are as follows: 1. The present invention starts the burner to spray flames, thereby heating the tubular heating furnace body and the inside of the convection chamber. At this time, the drive motor is started to rotate to drive the first rotating shaft to rotate, and the first rotating shaft rotates the first sprocket, the second sprocket and the chain. The chain rotation drives the burner to rotate. After the burner rotates, the flame can continuously change the contact position with the air inside the tubular heating furnace body, so that the heat is more evenly distributed to the entire tubular heating furnace body, so that the burner can heat the inside of the tubular heating furnace body more evenly and the heating effect is better. At the same time, because the burner no longer burns at the same position, it also effectively avoids the flame from always contacting the same pipe at the same position, which can effectively avoid reducing the aging of the pipeline and increase its service life.
[0015] 2. The present invention meshes the gears and the toothed plates with each other. At this time, the gears will rotate due to the meshing. At this time, the rotation of the gears will drive the limit grooves to rotate. The rotation of the limit grooves will drive the connecting column to move along the limit grooves. The movement of the connecting column will drive the push rod to move and eject inside the second support plate. After ejection, the push rod will contact the flame-blocking plate. Because the bottom of the flame-blocking plate is hinged to the fixed column, the flame-blocking plate will expand in a fan shape. After the flame is ejected, it will contact the flame-blocking plate, so that the injection shape of the flame can be controlled, thereby avoiding the high-temperature flame from directly contacting the pipeline, effectively avoiding the flame from contacting the pipeline for a long time during heating, effectively reducing the aging of the pipeline, and improving the service life of the pipeline. At the same time, since the flame shape is no longer direct, it can better fit the shape of the pipeline, thereby improving the temperature so that it can be more evenly heated, thereby reducing the risk of product deformation and cracking, and improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic structural diagram of the overall side of the present invention; Figure 3 It is a cross-sectional view of the main body of the tubular heating furnace of the present invention; Figure 4 For the present invention Figure 2 A magnified view of the structure at center A; Figure 5 is a cross-sectional view of the first support plate of the present invention; Figure 6 It is a structural schematic diagram of the burner of the present invention; Figure 7 It is a structural schematic diagram of the gear of the present invention; Figure 8 It is a structural schematic diagram of the limiting column of the present invention; Fig. 9 It is a schematic structural diagram of the fixed shaft sleeve of the present invention.
[0017] In the figure: 1. tubular heating furnace body; 2. convection chamber; 3. smoke outlet; 4. air inlet; 401. air outlet; 5. drive motor; 6. first rotating shaft; 7. first sprocket; 8. second sprocket; 9. chain; 10. first support plate; 11. annular slide groove; 12. support block; 13. connecting block; 14. burner; 15. flame guide ring; 16. fixed column; 17. gear; 18. tooth plate; 19. limit groove; 20. fixed shaft sleeve; 21. second support plate; 22. push rod; 23. connecting column; 24. limit column; 25. spring; 26. flame barrier plate; 27. second rotating shaft. DETAILED DESCRIPTION
[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0019] like Figures 1 to 9As shown, the embodiment of the present invention provides a heating furnace with exhaust gas treatment function, including a tubular heating furnace body 1, a convection chamber 2 is fixedly connected to the middle of the top of the tubular heating furnace body 1, two smoke outlets 3 are fixedly connected to the two sides of the top of the convection chamber 2, an air inlet 4 is fixedly connected to one side of the convection chamber 2, and an air outlet 401 is fixedly connected to the other side of the convection chamber 2, two driving motors 5 are fixedly connected to the two sides of the bottom of the tubular heating furnace body 1, and the output ends of the two driving motors 5 are fixedly connected to a first rotating shaft 6, a first sprocket 7 is fixedly sleeved on the outer side of the top of the first rotating shaft 6, a second rotating shaft 27 is arranged on one side of the first sprocket 7, the second rotating shaft 27 is rotatably connected to the tubular heating furnace body 1, a second sprocket 8 is fixedly sleeved on the outer side of the top of the second rotating shaft 27, a chain 9 is sleeved on the outer sides of the first sprocket 7 and the second sprocket 8, the first sprocket 7 and the second sprocket 8 are connected to each other through the chain 9, a flame arrester assembly is arranged inside the tubular heating furnace body 1, and a first support is arranged above the chain 9. The support plate 10, the first support plate 10 is fixedly connected to the tubular heating furnace body 1, and an annular slide groove 11 is opened inside the first support plate 10. Two support blocks 12 are fixedly connected to the two sides of the bottom of the first support plate 10 respectively. The flame is sprayed by the burner 14 to heat the inside of the tubular heating furnace body 1 and the convection chamber 2. At this time, the drive motor 5 is started to rotate and drive the first rotating shaft 6 to rotate. The first rotating shaft 6 rotates the first sprocket 7, the second sprocket 8 and the chain 9 to rotate. The chain 9 rotates and drives the burner 14 to rotate. After the burner 14 rotates, the flame can continuously change the contact position with the air inside the tubular heating furnace body 1, so that the heat is more evenly distributed to the entire tubular heating furnace body 1, so that the burner 14 can heat the inside of the tubular heating furnace body 1 more evenly and the heating effect is better. At the same time, since the burner 14 no longer burns at the same position, it is also effectively avoided that the flame always contacts the same pipe at the same position, which can effectively avoid reducing the aging of the pipeline and increase its service life.
[0020] The flame arresting assembly includes a plurality of connecting blocks 13, and the plurality of connecting blocks 13 are fixedly connected to the chain 9. A burner 14 is fixedly connected to the top of the connecting block 13, a flame guide ring 15 is fixedly connected to the top of the burner 14, and a fixed column 16 is fixedly connected to the middle of the burner 14. The flame arresting assembly also includes a gear 17, and the gear 17 is movably sleeved on the outer side of the fixed column 16. A plurality of tooth plates 18 are arranged inside the main body 1 of the tubular heating furnace, and a plurality of limit grooves 19 are opened in the tooth plate 18. A fixed sleeve 20 is provided at the bottom of the gear 17, and the fixed sleeve 20 is fixedly sleeved with the fixed column 16. A plurality of second support plates 21 are sleeved on the outside of the fixed sleeve 20, and a plurality of push rods 22 are slidably connected inside the second support plate 21. A plurality of connecting columns 23 are fixedly connected to one side of the top of the plurality of push rods 22. A plurality of limiting columns 24 are provided on the outside of the fixed column 16, and a spring 25 is movably sleeved on the outside of the plurality of limiting columns 24. One end of the spring 25 is fixedly connected to the fixed column 16, and the other end of the plurality of springs 25 is fixedly sleeved on the outside of the plurality of limiting columns 24. One end is fixedly connected with a flame-blocking plate 26, and one side of the plurality of flame-blocking plates 26 is hinged to the fixed column 16, and meshes with each other through the gear 17 and the toothed plate 18. At this time, the gear 17 will rotate due to the meshing, and the rotation of the gear 17 will drive the limit groove 19 to rotate, and the rotation of the limit groove 19 will drive the connecting column 23 to move along the limit groove 19, and the movement of the connecting column 23 will drive the push rod 22 to move inside the second support plate 21 and eject. After ejection, the push rod 22 will contact the flame-blocking plate 26, and because the bottom of the flame-blocking plate 26 is connected to the fixed column 1 6 is hinged, at this time, the flame-blocking plate 26 will expand in a fan shape, and the flame will contact the flame-blocking plate 26 after being ejected, so as to control the injection shape of the flame, thereby preventing the high-temperature flame from directly contacting the pipeline, effectively avoiding the flame from contacting the pipeline for a long time during heating, effectively reducing the aging of the pipeline, and improving the service life of the pipeline. At the same time, since the flame shape is no longer direct, it can better fit the shape of the pipeline, thereby improving it to be able to heat up more evenly, thereby reducing the risk of product deformation and cracking, and improving product quality.
[0021] Among them, the width of the annular groove 11 is greater than the width of the connecting block 13. The connecting block 13 will not touch the first support plate 10 when moving at the arc of the annular groove 11, avoiding collision with the arc when rotating to the arc, thereby hindering the movement and affecting normal work.
[0022] Among them, the multiple tooth plates 18 are arranged corresponding to the arc of the annular slide groove 11, and the number of teeth of the tooth plate 18 matches the number of teeth of the gear 17. By matching the number of teeth of the tooth plate 18 with the number of teeth of the gear 17, the number of teeth of the tooth plate 18 can be changed to control the difference in the number of teeth between the two to control the rotation distance of the gear 17, thereby controlling the opening and closing angle of the flame-blocking plate 26, thereby controlling the flame injection shape and making the heating more uniform.
[0023] Among them, multiple connecting columns 23 are arranged corresponding to the limiting groove 19, and multiple connecting columns 23 are slidably connected to the limiting groove 19. The height of the gear 17 inside the limiting groove 19 is higher than the height of the flame-blocking plate 26. The push rod 22 contacts the flame-blocking plate 26 when ejected, and the bottom of the burner 14 is flush with the first support plate 10. The first support plate 10 can support the burner 14. The push rod 22 contacts the flame-blocking plate 26 when ejected, so that it can push the flame-blocking plate 26 to open and close after the movement is ejected, so as to better control the spray shape of the flame of the flame-blocking plate 26, so as to make the heating more uniform. The bottom of the burner 14 is flush with the first support plate 10, so that the first support plate 10 can support the burner 14, which can effectively improve the support effect and improve the movement stability.
[0024] A method for treating a heating furnace with an exhaust gas treatment function comprises the following steps: S1, inputting the exhaust gas into the convection chamber 2 and the tubular heating furnace body 1 through the air inlet 4; S2, starting the drive motor 5 and the burner 14, the drive motor 5 drives the burner 14 to rotate, and the burner 14 rotates to spray flames to heat the pipe inside the tubular heating furnace body 1; S3, at this time, the rotation of the burner 14 causes the gear 17 to mesh and rotate with the tooth plate 18 during the rotation process, thereby controlling the shape of the flame ejected, thereby achieving uniform heating; S4. After the inside of the pipe is heated to a sufficient temperature, the exhaust gas is heated and purified through the pipes inside the tubular heating furnace body 1 and the convection chamber 2, and the exhaust gas is processed and discharged from the outlet 401 after the processing is completed.
[0025] Working principle: During the working process, the burner 14 is started, and the burner 14 will spray flames when it is started, thereby heating the inside of the tubular heating furnace body 1 and the convection chamber 2. At this time, the driving motor 5 is started to rotate to drive the first rotating shaft 6 to rotate, and the rotation of the first rotating shaft 6 drives the first sprocket 7 to rotate. At this time, since the first sprocket 7 and the second sprocket 8 are connected to each other through the chain 9, the rotation of the first sprocket 7 drives the second sprocket 8 and the chain 9 to rotate, and the rotation of the chain 9 drives the burner 14 to rotate. After the burner 14 rotates, the flame can continuously change the contact position with the air inside the tubular heating furnace body 1, so that the heat is more evenly distributed to the inside of the entire tubular heating furnace body 1, so that the burner 14 can heat the inside of the tubular heating furnace body 1 more evenly and the heating effect is better. At the same time, since the burner 14 no longer burns at the same position, it also effectively avoids the flame from always contacting the same pipe at the same position, which can effectively reduce the aging of the pipe and increase its service life. At the same time, the rotation of the burner 14 can drive the flame arresting assembly to rotate synchronously. When the flame arresting assembly rotates, the gear 17 and the toothed plate 18 will mesh with each other. At this time, the gear 17 will rotate due to the meshing. At this time, the rotation of the gear 17 will drive the limiting groove 19 to rotate. The rotation of the limiting groove 19 will drive the connecting column 23 to move along the limiting groove 19. The movement of the connecting column 23 will drive the push rod 22 to move and eject inside the second support plate 21. After ejection, the push rod 22 will contact the flame arresting plate 26, and because the bottom of the flame arresting plate 26 is hinged to the fixed column 16, the flame arresting plate 26 will expand in a fan shape at this time. After the flame is ejected, it will contact the flame arresting plate 26, so that the injection shape of the flame can be controlled, thereby avoiding the high-temperature flame from directly contacting the pipeline, effectively avoiding the flame from contacting the pipeline for a long time during heating, effectively reducing the aging of the pipeline, and improving the service life of the pipeline. At the same time, because the flame shape is no longer direct, it can better fit the pipeline shape, thereby improving it to be able to heat up more evenly, thereby reducing the risk of product deformation and cracking, and improving the quality of the product.
[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A heating furnace with an exhaust gas treatment function, comprising a tubular heating furnace body (1), a convection chamber (2) fixedly connected to the middle of the top of the tubular heating furnace body (1), two smoke outlets (3) fixedly connected to both sides of the top of the convection chamber (2), an air inlet (4) fixedly connected to one side of the convection chamber (2), and an air outlet (401) fixedly connected to the other side of the convection chamber (2), characterized in that: Two driving motors (5) are fixedly connected to both sides of the bottom of the tubular heating furnace body (1), and the output ends of the two driving motors (5) are fixedly connected to a first rotating shaft (6). A first sprocket (7) is fixedly sleeved on the outer side of the top of the first rotating shaft (6). A second rotating shaft (27) is provided on one side of the first sprocket (7). The second rotating shaft (27) is rotatably connected to the tubular heating furnace body (1). A second sprocket (8) is fixedly sleeved on the outer side of the top of the second rotating shaft (27). A chain (9) is sleeved on the outer sides of the first sprocket (7) and the second sprocket (8). The first sprocket (7) and the second sprocket (8) are connected to each other via the chain (9). A flame arresting assembly is provided inside the tubular heating furnace body (1).
2. The heating furnace with exhaust gas treatment function according to claim 1, characterized in that: A first support plate (10) is arranged above the chain (9), the first support plate (10) is fixedly connected to the tubular heating furnace body (1), an annular slide groove (11) is provided inside the first support plate (10), and two support blocks (12) are fixedly connected to both sides of the bottom of the first support plate (10).
3. The heating furnace with exhaust gas treatment function according to claim 2, characterized in that: The flame arresting assembly comprises a plurality of connecting blocks (13), each of the plurality of connecting blocks (13) being fixedly connected to the chain (9), a burner (14) being fixedly connected to the top of the connecting block (13), a flame guide ring (15) being fixedly connected to the top of the burner (14), and a fixing column (16) being fixedly connected to the middle of the burner (14).
4. The heating furnace with exhaust gas treatment function according to claim 3, characterized in that: The flame arresting assembly further comprises a gear (17), the gear (17) being movably sleeved on the outer side of the fixed column (16), a plurality of tooth plates (18) being arranged inside the tubular heating furnace body (1), a plurality of limit grooves (19) being provided in the tooth plates (18), a fixed shaft sleeve (20) being arranged at the bottom of the gear (17), the fixed shaft sleeve (20) being fixedly sleeved on the fixed column (16), a plurality of second support plates (21) being sleeved on the outer side of the fixed shaft sleeve (20), the second support plates (21) being arranged on the outer side of the fixed shaft sleeve (20), ) is slidably connected to a plurality of push rods (22) inside, a plurality of connecting columns (23) are fixedly connected to one side of the top of the plurality of push rods (22), a plurality of limiting columns (24) are arranged on the outside of the fixed column (16), a spring (25) is movably sleeved on the outside of the plurality of limiting columns (24), one end of the spring (25) is fixedly connected to the fixed column (16), the other end of the plurality of springs (25) is fixedly connected to a flame blocking plate (26), and one side of the plurality of flame blocking plates (26) is hinged to the fixed column (16).
5. The heating furnace with exhaust gas treatment function according to claim 4, characterized in that: The width of the annular sliding groove (11) is greater than the width of the connecting block (13), and the connecting block (13) will not come into contact with the first supporting plate (10) when moving in the circular arc of the annular sliding groove (11).
6. The heating furnace with exhaust gas treatment function according to claim 5, characterized in that: The plurality of tooth plates (18) are arranged corresponding to the circular arc of the annular slide groove (11), and the number of teeth of the tooth plates (18) matches the number of teeth of the gear (17).
7. The heating furnace with exhaust gas treatment function according to claim 6, characterized in that: The plurality of connecting columns (23) are all arranged corresponding to the limiting groove (19), and the plurality of connecting columns (23) are slidably connected inside the limiting groove (19).
8. The heating furnace with exhaust gas treatment function according to claim 7, characterized in that: The height of the gear (17) is higher than the height of the flame-blocking plate (26), and the push rod (22) contacts the flame-blocking plate (26) when being ejected.
9. The heating furnace with exhaust gas treatment function according to claim 8, characterized in that: The bottom of the burner (14) is flush with the first support plate (10), and the first support plate (10) is capable of supporting the burner (14).
10. A method for treating a heating furnace having an exhaust gas treatment function, characterized in that: The steps include: S1, inputting the exhaust gas into the convection chamber (2) and the interior of the tubular heating furnace body (1) through the air inlet (4); S2, starting the drive motor (5) and the burner (14), the drive motor (5) driving the burner (14) to rotate, and the burner (14) rotates to emit flames to heat the pipe inside the tubular heating furnace body (1); S3, at this time, the rotation of the burner (14) causes the gear (17) to mesh and rotate with the tooth plate (18) during the rotation process, thereby controlling the shape of the flame ejected, thereby achieving uniform heating; S4. After the inside of the pipe is heated to a sufficient temperature, the exhaust gas is heated and purified through the pipes inside the tubular heating furnace body (1) and the convection chamber (2), and the exhaust gas is processed and discharged from the outlet (401) after the processing is completed.