Internal heat recovery structure of oven for ceramic fiber filter tube processing

Abstract

The present application relates to the technical field of ceramic fiber filter tube production and processing, in particular to an oven internal heat recovery structure for ceramic fiber filter tube processing, comprising an oven and a heat exchanger arranged on one side of the oven, a hot air circulation assembly is further arranged on the top of the inner wall of the drying chamber, a heat energy recovery assembly is arranged on the top of the oven, and a workpiece preheating assembly is arranged in the preheating chamber. The present application recovers the moisture heat energy discharged from the inside of the drying chamber through the heat energy recovery assembly, and then sends it into the inside of the workpiece preheating assembly, and then preheats the surface of the filter tube, so as to reduce the temperature difference, thereby effectively improving the drying efficiency of the filter tube in the inside of the drying chamber, and recycling the heat energy in the discharged moisture in the inside of the drying chamber to the filter tube, which not only effectively reduces the energy consumption and improves the energy utilization rate, but also effectively saves energy and protects the environment during the ceramic fiber filter tube processing.

Description

Technical Field

[0001] This invention relates to the field of ceramic fiber filter tube production and processing technology, specifically to an internal heat recovery structure for ovens used in the processing of ceramic fiber filter tubes. Background Technology

[0002] When producing ceramic fiber filter tubes, the catalyst slurry needs to be titrated inside the filter tube. Then, the filter tube is sent into the oven for drying. The oven is generally a natural gas heating oven. The moisture content of the filter tube before drying is 11-12 kg / piece, and the moisture content of the filter tube after drying is 0.2%.

[0003] When ceramic fiber filter tubes are dried inside an oven, a large amount of high-temperature moisture is generated. This moisture contains a significant amount of heat energy. Current technologies typically use exhaust fans to directly remove this moisture, resulting in a waste of the internal heat energy. This not only increases energy consumption but also reduces energy efficiency, negatively impacting energy conservation and environmental protection in the ceramic fiber filter tube processing. To address these technical problems, we propose an oven-based heat recovery structure for ceramic fiber filter tube processing. This structure primarily recovers heat from the moisture generated during the drying process of the ceramic fiber filter tubes inside the oven, thereby improving energy utilization. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an internal heat recovery structure for ovens used in the processing of ceramic fiber filter tubes. This structure reduces energy consumption during the processing of ceramic fiber filter tubes, improves energy utilization, and has a positive impact on energy conservation and environmental protection in the ceramic fiber filter tube processing process.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: an internal heat recovery structure for an oven used in the processing of ceramic fiber filter tubes, comprising an oven and a heat exchanger disposed on one side of the oven, wherein a movable sealing door is slidably disposed on the front of the oven, and a fixed partition is disposed inside the oven, and a movable partition is slidably disposed below the interior of the fixed partition, wherein the movable partition and the fixed partition divide the interior of the oven into a preheating chamber and a drying chamber, wherein slide rails are disposed at the bottom of the inner walls of both the drying chamber and the preheating chamber, and a hot air inlet duct is disposed at the bottom of the inner wall of the drying chamber;

[0006] The oven is equipped with a heat recovery assembly on its top, which includes a dehumidifying rack. The dehumidifying rack is fixedly installed on the top of the inner wall of the drying chamber, and a mounting rack is fixedly installed on the top of the dehumidifying rack. A drying rack is movably installed inside the mounting rack, and the drying rack is filled with desiccant. A vent hood is movably installed on the top of the mounting rack. A first circulating fan is installed on one side of the top of the oven, and the air inlet of the first circulating fan is connected to the inside of the vent hood through an exhaust pipe. A second circulating fan is also installed on the other side of the top of the oven, and the air outlet of the second circulating fan is connected to the inside of a heat exchanger through an exhaust pipe. Fixed air ducts are installed at the air outlet of the first circulating fan and the air inlet of the second circulating fan, and the bottom ends of both fixed air ducts extend into the interior of the preheating chamber.

[0007] The preheating chamber is equipped with a workpiece preheating assembly, which includes a preheating frame. The preheating frame is movably arranged inside the preheating chamber. The preheating frame has several preheating through holes inside, and an exhaust channel and a blowing channel are respectively arranged at the upper and lower parts of the preheating frame. The interior of the exhaust channel and the blowing channel are respectively connected to the upper and lower parts of the preheating through holes.

[0008] Preferably, the fixed air duct located on one side of the first circulating fan is provided with an air supply spring tube, and the fixed air duct located on the other side of the second circulating fan is provided with an air extraction spring tube. The bottom ends of both the air supply spring tube and the air extraction spring tube are connected to the interior of the workpiece preheating assembly.

[0009] Preferably, a hot air circulation assembly is also provided on the top of the inner wall of the drying chamber. The hot air circulation assembly includes an air inlet frame and a circulation frame. An air inlet frame is fixedly provided on one side of the top of the inner wall of the drying chamber, and an air inlet is provided on one side of the air inlet frame. Circulating fans are provided on both sides inside the air inlet frame, and the air inlet ends of the two circulating fans are connected to the interior of the air inlet.

[0010] Preferably, a circulation frame is fixedly installed on both sides of the inner wall of the drying chamber, and a number of air blowing ports are provided on the opposite side of the two circulation frames. An air flow channel is also provided inside the two circulation frames, and the interior of the two air flow channels is connected to the interior of the air blowing ports. The two sides of the air inlet frame are fixedly connected to one side of the two circulation frames respectively, and the air outlets of the two circulating fans are connected to the interior of the two circulation frames respectively.

[0011] Preferably, electric sliding tables are provided on both sides of the inner wall of the preheating chamber, and one side of each electric sliding table is fixedly connected to both sides of the preheating frame.

[0012] Preferably, the interior of the exhaust air duct is connected to the interior of the exhaust spring tube, and the interior of the blowing air duct is connected to the interior of the blowing spring tube.

[0013] Preferably, the operation method of this heat recovery structure specifically includes the following steps:

[0014] When recovering heat from inside the oven, a negative pressure is first created inside the air guide hood using a first circulating fan and an exhaust pipe. The air guide hood then creates suction on the inside of the drying chamber, drawing the moisture inside the drying chamber into the mounting rack through a dehumidifier. After passing through the drying rack, the moisture is dried by the desiccant inside. The dehumidified air is then sent to a fixed duct on one side by the first circulating fan. The hot air is then sent into the workpiece preheating assembly using a spring tube inside the fixed duct. The workpiece preheating assembly preheats the surface of the filter tube inside the preheating chamber. Then, a second circulating fan and a fixed duct on the other side, along with an exhaust spring tube, draw the hot air out of the preheating chamber. Finally, the hot air is sent into the heat exchanger through an exhaust pipe for final heat recovery.

[0015] After the air supply spring tube delivers dry air containing heat energy into the interior of the workpiece preheating assembly, the preheating rack slides downwards under the control of the electric slide table, causing the preheating through hole inside the preheating rack to move from the top to the bottom of the filter tube. The air supply spring tube blows hot air into the lower part of the preheating through hole through the airflow channel, and the hot air preheats the surface of the filter tube inside the preheating through hole. At the same time, the exhaust spring tube extracts the hot air from the top of the preheating through hole through the exhaust channel, realizing the flow of hot air inside the preheating through hole.

[0016] Furthermore, when drying the workpiece inside the drying chamber, the two circulating fans inside the air inlet frame draw the rising hot air into the air channels inside the two circulating frames through the air inlet, and finally blow the hot air onto the surface of the filter tube through the air outlet on one side of the two circulating frames.

[0017] Compared with existing technologies, it has the following advantages:

[0018] 1. The heat energy of the moisture discharged from the drying chamber is recovered by the heat recovery component and sent to the interior of the workpiece preheating component. The workpiece preheating component is then used to preheat the surface of the filter tube. This avoids a large temperature difference between the surface temperature of the filter tube and the temperature inside the drying chamber after the filter tube enters the drying chamber, which would cause the filter tube to generate too much moisture during the drying process. By preheating the filter tube, the temperature difference is reduced, thereby effectively improving the drying efficiency of the filter tube inside the drying chamber. Furthermore, by recovering the heat energy from the moisture discharged from the drying chamber and reusing it on the filter tube, not only can energy consumption be effectively reduced and energy utilization rate improved, but it can also have a positive impact on energy conservation and environmental protection in the ceramic fiber filter tube processing process.

[0019] 2. Hot air is introduced into the drying chamber through the hot air inlet duct at the bottom of the drying chamber. The hot air dries the filter tubes. Simultaneously, after rising, the hot air is drawn into the surface of the filter tubes by the hot air circulation component above the drying chamber. By circulating the hot air inside the drying chamber, energy utilization efficiency is improved, and the drying efficiency of the workpiece is also effectively improved, reducing energy consumption. As the workpiece gradually dries, the moisture in the workpiece turns into humid air and rises. The humid air is extracted by the heat recovery component, and the heat energy in the humid air is recovered and reused, significantly improving energy utilization and reducing energy waste.

[0020] 3. By moving the preheating through-hole inside the preheating rack from the top to the bottom of the filter tube, hot air is blown into the lower part of the preheating through-hole through the airflow channel using the air supply spring tube. The hot air preheats the surface of the filter tube inside the preheating through-hole. At the same time, the hot air above the preheating through-hole is extracted using the exhaust spring tube through the exhaust channel. This achieves airflow inside the preheating through-hole, improving the preheating efficiency of the filter tube. By preheating the filter tube, the temperature difference is reduced, thereby effectively improving the drying efficiency of the filter tube inside the drying chamber. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal heat recovery structure of an oven used for processing ceramic fiber filter tubes according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the oven according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the air inlet frame and circulation frame structure according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the air guide hood and fixed air duct structure according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the mounting frame and drying rack structure according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the preheating rack and oven structure according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of the preheating rack according to an embodiment of the present invention.

[0028] In the diagram: 1. Oven; 2. Heat exchanger; 3. Sealed door; 4. Fixed partition; 5. Movable partition; 6. Hot air inlet duct; 11. Air inlet rack; 12. Circulation rack; 21. Dehumidifier rack; 22. Mounting rack; 23. Drying rack; 24. Air guide hood; 25. First circulating fan; 26. Exhaust pipe; 27. Second circulating fan; 28. Air guide pipe; 29. ​​Fixed air duct; 210. Air supply spring pipe; 211. Exhaust spring pipe; 31. Preheating rack; 32. Preheating through hole; 33. Exhaust air duct; 34. Air blowing air duct. Detailed Implementation

[0029] 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 embodiments of the present invention, and not all embodiments. 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.

[0030] Example 1

[0031] Please see Figures 1 to 2 As shown, the internal heat recovery structure of an oven used for processing ceramic fiber filter tubes includes an oven 1 and a heat exchanger 2 disposed on one side of the oven 1. A movable sealing door 3 is slidably disposed on the front of the oven 1. A sliding drive frame is disposed above the front of the oven 1, which drives the sealing door 3 to slide open and close on the front of the oven 1. The opening and closing switch of the sealing door 3 is located on the front. The sealing door 3 seals the interior of the oven 1. At the same time, both the inner wall of the oven 1 and the inner side of the sealing door 3 are provided with insulation layers to reduce heat loss inside the oven 1 and improve energy utilization. For efficiency; the oven 1 is also equipped with a fixed partition 4 inside, and a movable partition 5 is slidably installed below the fixed partition 4. The movable partition 5 and the fixed partition 4 divide the interior of the oven 1 into a preheating chamber and a drying chamber. The bottom of the inner wall of both the drying chamber and the preheating chamber is equipped with a slide rail, and the bottom of the inner wall of the drying chamber is also equipped with a hot air inlet duct 6. The slide rail is used to position the roller trolley to enter the oven 1. In addition, the heat from the natural gas burner is sent into the hot air inlet duct 6 through the circulating fan to quickly dry the workpiece inside the drying chamber.

[0032] Preferably, a hot air circulation component is also provided on the top of the inner wall of the drying chamber, a heat recovery component is provided on the top of the oven 1, and a workpiece preheating component is provided inside the preheating chamber. During the production and processing of ceramic fiber filter tubes, the filter tubes are placed on top of a roller trolley. After the catalyst slurry is titrated inside the filter tubes, the roller trolley is sent into the oven 1 via a track. The filter tubes first enter the preheating chamber. The heat recovery component recovers the heat energy from the moisture discharged from the drying chamber and sends it into the workpiece preheating component. The workpiece preheating component then preheats the surface of the filter tubes to prevent a large temperature difference between the filter tube surface and the interior of the drying chamber, which would otherwise cause excessive moisture generation during drying. By preheating the filter tubes, the temperature difference is reduced, effectively improving the drying efficiency of the filter tubes inside the drying chamber. Furthermore, by preheating the filter tubes, the heat energy from the moisture discharged from the drying chamber is further reduced. The heat energy in the air is recovered and reused on the filter tube, which not only effectively reduces energy consumption and improves energy utilization, but also has a positive impact on energy conservation and environmental protection in the ceramic fiber filter tube processing. After the filter tube surface is preheated, it is sent into the drying chamber. Hot air is introduced into the drying chamber through the bottom hot air inlet 6 to dry the filter tube. The hot air rises and is then drawn by the hot air circulation component above the drying chamber and blown back onto the surface of the filter tube. By circulating the hot air inside the drying chamber, energy utilization efficiency is improved, and the drying efficiency of the workpiece is also effectively improved, reducing energy consumption. As the workpiece gradually dries, the moisture in the workpiece turns into humid air and rises. The humid air is extracted by the heat recovery component, and the heat energy in the humid air is recovered and reused, which significantly improves energy utilization and reduces energy waste.

[0033] like Figure 3 As shown, preferably, the hot air circulation assembly includes an air inlet frame 11 and a circulation frame 12. The air inlet frame 11 is fixedly installed on one side of the top of the inner wall of the drying chamber, and an air inlet is provided on one side of the air inlet frame 11. Circulating fans are provided on both sides inside the air inlet frame 11, and the air inlet ends of the two circulating fans are connected to the interior of the air inlet. Circulating frames 12 are fixedly installed on both sides of the inner wall of the drying chamber, and several air outlets are provided on the opposite side of the two circulating frames 12. Air channels are also provided inside the two circulating frames 12, and the interior of the two air channels is connected to the interior of the air outlets. The two sides of the air inlet frame 11 are fixedly connected to one side of the two circulating frames 12, and the air outlet ends of the two circulating fans are connected to the interior of the two circulating frames 12.

[0034] It should be noted that when drying the workpiece inside the drying chamber, the two circulating fans inside the air inlet frame 11 draw the rising hot air into the air channels inside the two circulation frames 12 through the air inlet. Finally, the hot air is blown onto the surface of the filter tube through the air outlet on one side of the two circulation frames 12, which improves the drying efficiency of the filter tube and also prevents the rising hot air from being directly discharged with the moisture, thus improving the energy utilization rate.

[0035] like Figures 3-6 As shown, preferably, the heat recovery assembly includes a dehumidifier rack 21, which is fixedly installed on the top of the inner wall of the drying chamber. A mounting frame 22 is fixedly installed on the top of the dehumidifier rack 21. A drying rack 23 is movably installed inside the mounting frame 22, and the drying rack 23 is filled with desiccant. Furthermore, a set of circulating heat exchange tubes can be installed inside the drying rack 23, with both ends extending outside the oven 1. After the desiccant dries the heat-containing moisture, it also carries a certain amount of heat. Therefore, by installing a set of circulating heat exchange tubes inside the drying rack 23, the heat inside the desiccant can be recovered and utilized. A vent hood 24 is movably installed on the top of the mounting frame 22, and a first circulating fan 2 is installed on one side of the top of the oven 1. 5. The air inlet of the first circulating fan 25 is connected to the interior of the air guide hood 24 through the exhaust pipe 26. A second circulating fan 27 is also provided on the other side of the top of the oven 1. The air outlet of the second circulating fan 27 is connected to the interior of the heat exchanger 2 through the air guide pipe 28. Fixed air pipes 29 are provided at the air outlet of the first circulating fan 25 and the air inlet of the second circulating fan 27. The bottom ends of the two fixed air pipes 29 extend into the interior of the preheating chamber. An air supply spring pipe 210 is provided inside the fixed air pipe 29 on the side of the first circulating fan 25. An exhaust spring pipe 211 is provided inside the fixed air pipe 29 on the side of the second circulating fan 27. The bottom ends of the air supply spring pipe 210 and the exhaust spring pipe 211 are connected to the interior of the workpiece preheating assembly.

[0036] It should be noted that during heat recovery of the moisture discharged from the drying chamber, the first circulating fan 25, in conjunction with the exhaust pipe 26, creates a negative pressure inside the air guide hood 24. The air guide hood 24 then generates suction on the interior of the drying chamber, drawing the moisture inside through the dehumidification rack 21 into the mounting frame 22. After passing through the drying rack 23, the moisture is dried by the desiccant inside. The dehumidified air is then sent through the first circulating fan 25 into the fixed air duct 29 on one side, utilizing the fixed... The air supply spring tube 210 inside the air duct 29 delivers dry air containing heat energy into the interior of the workpiece preheating assembly. After the surface of the filter tube inside the preheating chamber is preheated by the workpiece preheating assembly, the hot air inside the preheating chamber is drawn away by the second circulating fan 27 and the fixed air duct 29 on the other side in conjunction with the exhaust spring tube 211. Finally, the extracted hot air is sent into the interior of the heat exchanger 2 through the air guide tube 28. The hot air undergoes final heat recovery treatment in the heat exchanger 2, maximizing the utilization of the heat inside the oven and reducing energy waste.

[0037] Example 2

[0038] like Figure 6 and Figure 7 As shown, in a preferred embodiment, the specific structure of the workpiece preheating assembly is further described. The workpiece preheating assembly includes a preheating frame 31, which is movably arranged inside the preheating chamber. Electric sliding tables are provided on both sides of the inner wall of the preheating chamber, and one side of each of the two electric sliding tables is fixedly connected to the two sides of the preheating frame 31. The preheating frame 31 has a plurality of preheating through holes 32 inside, and an exhaust channel 33 and a blowing channel 34 are respectively provided at the upper and lower parts of the preheating frame 31. The interiors of the exhaust channel 33 and the blowing channel 34 are respectively connected to the upper and lower parts of the preheating through holes 32. The interior of the exhaust channel 33 is connected to the interior of the exhaust spring tube 211, and the interior of the blowing channel 34 is connected to the interior of the air supply spring tube 210.

[0039] It should be noted that during the preheating treatment of the filter tube, the filter tube is driven into the preheating chamber by a roller trolley. The preheating rack 31 is controlled by an electric slide table to slide downward, allowing the preheating through hole 32 inside the preheating rack 31 to move from the top to the bottom of the filter tube. Hot air is blown into the lower part of the preheating through hole 32 through the air blowing channel 34 using the air supply spring pipe 210. The hot air is used to preheat the surface of the filter tube inside the preheating through hole 32. At the same time, the hot air above the preheating through hole 32 is extracted by the exhaust spring pipe 211 through the exhaust channel 33, realizing the flow of hot air inside the preheating through hole 32 and improving the preheating efficiency of the filter tube. By preheating the filter tube, the temperature difference is reduced, thereby effectively improving the drying efficiency of the filter tube inside the drying chamber.

[0040] Example 3

[0041] like Figures 1-7 As shown, this embodiment further discloses a method for operating the internal heat recovery structure of an oven used in ceramic fiber filter tube processing, specifically including the following steps:

[0042] When recovering heat from inside the oven 1, the first circulating fan 25, in conjunction with the exhaust pipe 26, creates a negative pressure inside the air guide hood 24. The air guide hood 24 then generates suction on the inside of the drying chamber, drawing the moisture inside the drying chamber into the mounting frame 22 through the dehumidification rack 21. After passing through the drying rack 23, the moisture is dried by the desiccant inside the drying rack 23. The dehumidified air is then sent into the fixed air duct 29 on one side by the first circulating fan 25. The hot air is then sent into the workpiece preheating assembly by the air supply spring pipe 210 inside the fixed air duct 29. After the workpiece preheating assembly preheats the surface of the filter tube inside the preheating chamber, the hot air inside the preheating chamber is drawn away by the second circulating fan 27 and the fixed air duct 29 on the other side in conjunction with the exhaust spring pipe 211. Finally, the hot air is sent into the heat exchanger 2 through the air guide pipe 28 for final heat recovery.

[0043] After the air supply spring tube 210 delivers dry air containing heat energy into the interior of the workpiece preheating assembly, the preheating rack 31 is controlled to slide downward by the electric slide table, so that the preheating through hole 32 inside the preheating rack 31 moves from the top of the filter tube to the bottom. The air supply spring tube 210 blows hot air into the lower part of the preheating through hole 32 through the air blowing channel 34, and the hot air is used to preheat the surface of the filter tube inside the preheating through hole 32. At the same time, the exhaust spring tube 211 extracts the hot air above the preheating through hole 32 through the exhaust channel 33, so as to realize the flow of hot air inside the preheating through hole 32.

[0044] Furthermore, when drying the workpiece inside the drying chamber, the two circulating fans inside the air inlet frame 11 draw the rising hot air into the air channels inside the two circulation frames 12 through the air inlet, and finally blow the hot air onto the surface of the filter tube through the air outlet on one side of the two circulation frames 12.

[0045] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An internal heat recovery structure for an oven used in the processing of ceramic fiber filter tubes, comprising an oven (1) and a heat exchanger (2) disposed on one side of the oven (1), wherein a movable sealing door (3) is slidably disposed on the front side of the oven (1), characterized in that: The oven (1) is also provided with a fixed partition (4) inside, and a movable partition (5) is slidably provided below the fixed partition (4). The movable partition (5) and the fixed partition (4) divide the interior of the oven (1) into a preheating chamber and a drying chamber. The bottom of the inner wall of the drying chamber and the preheating chamber are both provided with slide rails, and the bottom of the inner wall of the drying chamber is also provided with a hot air inlet duct (6). The oven (1) is equipped with a heat recovery assembly on its top. The heat recovery assembly includes a dehumidifier rack (21). The dehumidifier rack (21) is fixedly installed on the top of the inner wall of the drying chamber. A mounting rack (22) is fixedly installed on the top of the dehumidifier rack (21). A drying rack (23) is movably installed inside the mounting rack (22). The drying rack (23) is filled with desiccant. A vent hood (24) is movably installed on the top of the mounting rack (22). A first circulating fan (25) is installed on one side of the top of the oven (1). The air inlet of the first circulating fan (25) is connected to the interior of the vent hood (24) through an exhaust pipe (26). A second circulating fan is also installed on the other side of the top of the oven (1). The second circulating fan (27) has its outlet end connected to the interior of the heat exchanger (2) via a guide pipe (28). The outlet end of the first circulating fan (25) and the inlet end of the second circulating fan (27) are both provided with fixed air pipes (29), and the bottom ends of the two fixed air pipes (29) extend into the interior of the preheating chamber. The fixed air pipe (29) located on one side of the first circulating fan (25) is provided with a supply air spring pipe (210), and the fixed air pipe (29) located on one side of the second circulating fan (27) is provided with a suction air spring pipe (211). The bottom ends of the supply air spring pipe (210) and the suction air spring pipe (211) are both connected to the interior of the workpiece preheating assembly. The preheating chamber is equipped with a workpiece preheating assembly, which includes a preheating rack (31). The preheating rack (31) is movably installed inside the preheating chamber. Electric sliding tables are installed on both sides of the inner wall of the preheating chamber, and one side of each electric sliding table is fixedly connected to the two sides of the preheating rack (31). The preheating rack (31) is equipped with several preheating through holes (32). An exhaust channel (33) and a blowing channel (34) are respectively installed at the upper and lower parts of the preheating rack (31). The interiors of the exhaust channel (33) and the blowing channel (34) are respectively connected to the upper and lower parts of the preheating through holes (32). The interior of the exhaust channel (33) is connected to the interior of the exhaust spring tube (211), and the interior of the blowing channel (34) is connected to the interior of the air supply spring tube (210).

2. The internal heat recovery structure of the oven for processing ceramic fiber filter tubes according to claim 1, characterized in that: A hot air circulation assembly is also provided on the top of the inner wall of the drying chamber. The hot air circulation assembly includes an air inlet frame (11) and a circulation frame (12). An air inlet frame (11) is fixedly provided on one side of the top of the inner wall of the drying chamber, and an air inlet is provided on one side of the air inlet frame (11). Circulating fans are provided on both sides inside the air inlet frame (11), and the air inlet ends of the two circulating fans are connected to the interior of the air inlet.

3. The internal heat recovery structure of the oven for processing ceramic fiber filter tubes according to claim 2, characterized in that: Both sides of the inner wall of the drying chamber are fixedly provided with circulation racks (12), and each of the two circulation racks (12) has several air blowing ports on its opposite side. The two circulation racks (12) are also provided with air channels, and the interior of the two air channels is connected to the interior of the air blowing ports. The two sides of the air inlet rack (11) are fixedly connected to one side of the two circulation racks (12), and the air outlets of the two circulating fans are connected to the interior of the two circulation racks (12).

4. The internal heat recovery structure of the oven for processing ceramic fiber filter tubes according to claim 1, characterized in that: The working method of this heat recovery structure specifically includes the following steps: When recovering heat from inside the oven (1), the first circulating fan (25) and the exhaust pipe (26) first create a negative pressure inside the air guide hood (24). The air guide hood (24) generates suction on the inside of the drying chamber, drawing the moisture inside the drying chamber into the mounting rack (22) through the dehumidification rack (21). After passing through the drying rack (23), the moisture in the moisture is dried by the desiccant inside the drying rack (23). The dehumidified air is then sent into the fixed air duct (2) on one side through the first circulating fan (25). Inside 9), the hot air containing heat energy is sent into the interior of the workpiece preheating assembly by the air supply spring tube (210) inside the fixed air duct (29). After the filter tube surface inside the preheating chamber is preheated by the workpiece preheating assembly, the hot air inside the preheating chamber is drawn away by the second circulating fan (27) and the fixed air duct (29) on the other side in conjunction with the exhaust spring tube (211). Finally, the hot air is sent into the interior of the heat exchanger (2) through the air guide tube (28) for the final heat recovery treatment of the hot air in the heat exchanger (2). After the air supply spring tube (210) sends dry air containing heat energy into the interior of the workpiece preheating assembly, the preheating rack (31) is controlled to slide downward by the electric slide table, so that the preheating through hole (32) inside the preheating rack (31) moves from the top of the filter tube to the bottom. The air supply spring tube (210) blows hot air into the lower part of the preheating through hole (32) through the blowing channel (34), and the hot air is used to preheat the surface of the filter tube inside the preheating through hole (32). At the same time, the exhaust spring tube (211) extracts the hot air above the preheating through hole (32) through the exhaust channel (33), so as to realize the flow of hot air inside the preheating through hole (32). Furthermore, when drying the workpiece inside the drying chamber, the two circulating fans inside the air inlet frame (11) draw the rising hot air into the air channels inside the two circulation frames (12) through the air inlet, and finally blow the hot air onto the surface of the filter tube through the air outlet on one side of the two circulation frames (12).

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