Catalytic combustion furnace for waste gas treatment in PCB production

Abstract

The invention relates to the technical field of industrial waste gas treatment, in particular to a catalytic combustion furnace for waste gas treatment in PCB (printed circuit board) production, which comprises a preheating heat exchange unit and a catalytic reaction unit positioned above the preheating heat exchange unit, the preheating heat exchange unit comprises a preheating heat exchange box, and a preheating chamber is arranged at the bottom of the inner side of the preheating heat exchange box; a heat exchange pipe set is arranged on the inner side of the preheating heat exchange box and located above the preheating chamber, the catalytic reaction unit comprises a catalytic box installed on the top of the preheating heat exchange box, and an exhaust port is formed in the top of the catalytic box. The catalytic bed adopts a multi-layer drawing type design, the reactor does not need to be integrally disassembled, the reactor can be independently drawn out like a drawer for catalyst replacement, cleaning or overhaul, the shutdown maintenance time is greatly shortened, the production continuity is guaranteed, a plurality of independent catalytic beds form a module and can be flexibly combined and used according to the processing load, online hot switching is allowed, and the production efficiency is improved. And the flexibility of equipment operation and the adaptability to different treatment requirements are improved.

Description

Technical Field

[0001] This application relates to the field of industrial waste gas treatment technology, and in particular to a catalytic combustion furnace for waste gas treatment in PCB production. Background Technology

[0002] In PCB semiconductor manufacturing processes, etching, cleaning, and coating processes generate waste gases with complex compositions and large concentration fluctuations. Currently widely used catalytic combustion devices typically include a preheating unit, a heat exchanger, a catalytic reaction chamber, and an exhaust unit.

[0003] In existing technologies, the catalyst bed in the catalytic unit is usually fixed or detachably installed inside the catalytic unit. The catalyst replacement and cleaning process is cumbersome and requires shutdown to disassemble the reactor, which affects continuous production. In addition, different catalysts may be used depending on the composition of the waste gas, and the particle size of the catalyst may also be different.

[0004] In the existing technology, after the exhaust gas is preheated, it needs to pass through the catalyst bed and react with the catalyst. Therefore, it is necessary to make a hole at the bottom of the catalyst bed and place the catalyst above the hole. However, the size of the hole in the catalyst bed in the existing technology is usually fixed and cannot be adjusted. Therefore, it is difficult to adapt to catalyst particles of different sizes. If the catalyst bed is replaced directly, it is necessary to shut down the machine for disassembly and assembly, which is more complicated and requires different catalyst beds, increasing the cost. On the other hand, the catalyst is artificially laid in the catalytic bed in advance and reacts directly with the exhaust gas in the catalytic unit. Since the catalyst has a certain thickness when it is laid, if it is laid too thin, the reaction will be too fast and frequent shutdowns will be required to replace the catalyst, which will affect the catalytic effect. At the same time, the contact time between the catalyst and the gas flow is short, which may affect the catalytic efficiency. Moreover, after catalysis, some catalyst may adhere to the catalytic bed, which is inconvenient to clean and requires additional tools to assist in cleaning.

[0005] Based on this, those skilled in the art have proposed a catalytic combustion furnace for waste gas treatment in PCB production, providing a new solution to the aforementioned technical problems. Summary of the Invention

[0006] To address the problems mentioned in the background art, this application provides a catalytic combustion furnace for waste gas treatment in PCB manufacturing.

[0007] This application provides a catalytic combustion furnace for waste gas treatment in PCB manufacturing, which adopts the following technical solution: A catalytic combustion furnace for waste gas treatment in PCB manufacturing includes a preheating heat exchange unit and a catalytic reaction unit located above it. The preheating heat exchange unit includes a preheating heat exchange box, with a preheating chamber located at the bottom of the inner side of the preheating heat exchange box. A heat exchange tube assembly is arranged inside the preheating heat exchange box and above the preheating chamber. The catalytic reaction unit includes a catalytic box installed on top of the preheating heat exchange box. An exhaust port is provided on the top of the catalytic box. A multi-layer catalytic module is arranged inside the catalytic box. The multi-layer catalytic module includes multiple catalytic beds, which are arranged in multiple layers and pulled out and installed inside the catalytic box. The furnace also includes an electric heating tube assembly arranged around the top and sides of the multi-layer catalytic module.

[0008] By adopting the above technical solution, the catalytic bed is designed in a pull-out manner, allowing operators to easily extract or push in individual catalytic beds without entering the equipment or performing complex overall disassembly. This greatly simplifies the process of catalyst replacement, replenishment, or catalytic bed cleaning, improves maintenance efficiency, and shortens downtime. Multiple independent catalytic beds form a multi-layer module, which can flexibly adjust the number and combination of online operating catalytic beds according to the waste gas treatment volume, reaction requirements, or actual operating conditions, such as the need for offline replacement of some catalytic beds. This improves the equipment's adaptability and operational flexibility to different treatment needs. The multi-layer arrangement, combined with the surrounding heating of the electric heating tube group, allows the waste gas to pass through different catalysts or different layers of the same catalyst layer by layer, extending the effective contact time and making the temperature distribution more uniform, which is conducive to the depth and fullness of the catalytic reaction.

[0009] Optionally, the bottom of the catalyst bed is provided with a plurality of first flow holes, a catalyst insert plate is inserted into the bottom inner side of the catalyst bed, a second flow hole is provided on the catalyst insert plate and above the first flow holes, a first adjusting screw is rotatably provided on the side wall of the catalyst bed located outside the catalyst box, and a connecting block is fixed on the top of the catalyst insert plate near the end of the first adjusting screw, and the first adjusting screw is threadedly connected to the connecting block.

[0010] By adopting the above technical solution, the position of the catalyst insert plate can be precisely adjusted by rotating the first adjusting screw, thereby changing the relative opening between the first and second flow holes, i.e., the flow orifice diameter. This allows the same catalyst bed to accommodate catalyst particles of different sizes, eliminating the need to design and manufacture catalyst beds of different specifications specifically for different catalysts. This significantly enhances the versatility of the equipment and reduces spare parts costs and inventory management difficulties. The adjustment operation is performed on the outside of the catalyst bed, making it simple to operate and allowing for rapid adjustments when necessary, such as when switching catalyst types, thus improving the equipment's response speed to different operating conditions.

[0011] Optionally, a support side plate is fixed inside the catalytic chamber and on both sides of the catalytic bed. A guide support groove is opened on the support side plate and on one side of the catalytic bed. Several support rods are inserted inside the catalytic bed. Rollers that match the guide support grooves are rotatably connected to both ends of the support rods. The catalytic bed is installed between the two support side plates through the support rods and the rollers.

[0012] By adopting the above technical solution, the rollers roll in the guide support groove, which not only provides stable and reliable load-bearing support for the catalyst bed, but also greatly reduces the frictional resistance during the extraction process, making the loading and extraction of the catalyst bed very labor-saving and smooth, especially suitable for heavier or larger catalyst bed modules; the guide support groove ensures that each catalyst bed can be accurately installed in the preset position, ensuring the accuracy of the relative position between the catalyst beds and the gas flow channel, which is conducive to the uniform distribution of airflow.

[0013] Optionally, the support rod is provided with multiple blades circumferentially on its outer side, and the distance between the central axes of two adjacent support rods is greater than or equal to the width of the two blades.

[0014] By adopting the above technical solution, it is ensured that the blades on adjacent support rods will not collide or jam with each other when rotating, providing the necessary physical space for the rotational movement of the blades and ensuring the stability and reliability of the subsequent rotational function.

[0015] Optionally, the catalyst bed is provided with a rotary drive mechanism on both sides inside, which is used to drive the support rod and the blade to rotate.

[0016] By adopting the above technical solution, the catalyst layer on the surface of the catalytic bed can be moderately stirred or turned over by driving the blades to rotate. This prevents the catalyst from hardening or forming fixed airflow channels due to long-term fixed laying, making the airflow distribution more uniform and the catalyst active sites more fully exposed, thereby improving catalytic efficiency and catalyst utilization. The rotating blades also have a certain disturbance effect on the passing exhaust gas, increasing the contact opportunity and mixing degree between the exhaust gas and the catalyst particles, which helps to improve the reaction rate.

[0017] Optionally, the rotary drive mechanism includes drive gears fixed at both ends of the outer side of the support rod, and an adjusting rack slidably disposed on both sides inside the catalyst bed and located below the drive gears. Multiple drive gears located on the same side are meshed with the adjusting rack. One end of the adjusting rack is fixed with a handle, which extends out of the catalyst bed and the catalyst box.

[0018] By adopting the above technical solution, the gear and rack mechanism of all support rods on the same side can be driven synchronously by a single handle, thereby driving all blades to rotate uniformly. This design simplifies the drive structure, makes the operation centralized and convenient, and avoids the trouble of adjusting multiple drive sources separately. The handle extends to the outside of the catalyst bed and catalyst box, so that the adjustment can be carried out without stopping the machine or disassembling the catalyst bed, which is convenient for adjusting the gas-solid contact mode in real time according to the reaction status.

[0019] Optionally, vertical movable grooves are vertically formed on both sides of the catalyst bed and outside the support rod. The support rod is slidably and rotatably disposed inside the corresponding vertical movable groove. A guide rail is provided inside the catalyst bed and below the handle. The handle is slidably connected to the top of the guide rail. Several guide adjustment screws are inserted into the bottom inner side of the guide rail. The guide rail is slidably disposed on the several guide adjustment screws. A spring is sleeved on the outside of the guide adjustment screw. The two ends of the spring abut against the bottom of the guide rail and the bottom of the inner side of the catalyst bed, respectively. The guide adjustment screw extends out of the bottom of the catalyst bed and is threadedly connected to the catalyst bed.

[0020] By adopting the above technical solution, the compression of the spring can be changed by rotating the guide adjusting screw, thereby driving the guide rail and rack to move up and down, and thus adjusting the height position of the support rod and the blade to adapt to catalysts of different particle sizes or to adapt to different stirring requirements.

[0021] Optionally, an insert frame is inserted into the inner side of the catalyst bed, and insert strips are provided on both sides of the insert frame. The insert strips are inserted and slidably connected to the inner side of the catalyst bed. An inclined guide groove is provided on the insert strip at a position corresponding to the vertical movable groove. The support rod passes through the inner side of the corresponding vertical movable groove and the inclined guide groove. A handle is fixedly installed at one end of the catalyst bed and on the outside of the catalyst box. A guide rod is provided at the end of the insert frame near the handle. The guide rod is inserted into the inner side of the catalyst bed and slidably connected to the catalyst bed. A second adjusting screw is rotatably connected to the end of the insert frame near the guide rod. The second adjusting screw is threadedly connected to the side wall of the catalyst bed.

[0022] By adopting the above technical solution, the movement of the insert holder and insert strips can be controlled by rotating the second adjusting screw. The inclined guide groove on the insert strip, in conjunction with the support rod, can convert the linear movement of the insert strip into the lifting and lowering movement of the support rod, thus realizing the adjustment of the overall height of the support rod and blades. Adjusting the height of the support rod can directly change the packing thickness or spatial distribution of the catalyst inside the catalytic bed, thereby changing the path length of the waste gas flow and the bed resistance, enabling the reactor to adapt to catalysts with different activities and reaction kinetics, or to optimize the contact time when treating waste gas of different concentrations.

[0023] Optionally, an auxiliary burner is provided in the preheating chamber for initial heating of the exhaust gas flowing down into the preheating chamber.

[0024] By adopting the above technical solution, the auxiliary burner provides a reliable initial heat source, which can quickly heat the incoming waste gas to the ignition temperature required for the catalytic reaction during the equipment start-up phase or when the calorific value of the waste gas itself is insufficient, thus ensuring the smooth start-up and continuous stable operation of the catalytic reaction.

[0025] Optionally, a waste gas treatment method for a catalytic combustion furnace used in PCB manufacturing includes the following steps: S: Exhaust gas enters from the inlet and flows down through the top of the heat exchanger tube assembly to the preheating chamber; S: After the exhaust gas descends to the inner side of the preheating chamber is heated, it rises and diffuses upward through the gaps in the heat exchange tube assembly, exchanging heat with the exhaust gas descending inside the tube in a counter-current manner. S: The heated exhaust gas enters the multi-layer catalytic module inside the catalytic chamber and undergoes a catalytic oxidation reaction under the combined action of the catalyst and the electric heating tube assembly; S4: The purified gas is discharged through the exhaust port.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The catalyst bed of the present invention adopts a multi-layer pull-out design, which eliminates the need for complete disassembly of the reactor. It can be pulled out independently like a drawer for catalyst replacement, cleaning or maintenance, which greatly shortens downtime for maintenance and ensures the continuity of production. Multiple independent catalyst beds form a module that can be flexibly combined according to the processing load and allows for online thermal switching, which improves the flexibility of equipment operation and adaptability to different processing needs. 2. The present invention drives the catalytic insert plate through the first adjusting screw, which can steplessly adjust the overlap area of ​​the first flow hole and the second flow hole, thereby changing the effective flow hole diameter. This allows a single catalytic bed to be adapted to catalysts of different particle sizes, from granules to small balls, without the need to prepare catalytic beds of various specifications, thus reducing equipment manufacturing costs and spare parts inventory pressure. 3. The present invention can drive all support rods and blades to rotate synchronously through a rotary drive mechanism. The rotation of the blades can effectively disturb the catalyst bed, prevent caking and channeling, make the airflow distribution more uniform, fully expose the active sites of the catalyst, and significantly improve the catalytic reaction rate and catalyst utilization. 4. The present invention drives the insert frame to move by rotating the second adjusting screw, and controls all support rods to rise and fall synchronously by using the inclined guide groove. This can adjust the overall thickness of the catalyst layer or the effective reaction space in the catalytic bed, thereby changing the waste gas residence time and bed pressure drop to adapt to different reaction kinetic requirements or waste gas concentration changes. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a catalytic combustion furnace for waste gas treatment in PCB production, according to an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the internal structure of the catalyst box in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the guide support groove in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the structure of the catalyst bed and the first flow hole in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the structure of the multilayer catalytic module in an embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the structure of the catalyst insert and the second flow hole in an embodiment of this application.

[0033] Figure 7 This is a schematic diagram of the support rod, roller, and blade structure according to an embodiment of this application.

[0034] Figure 8 This is a schematic diagram of the structure of multiple support rods and blades in an embodiment of this application.

[0035] Figure 9 This is a schematic diagram of the rotary drive mechanism according to an embodiment of this application.

[0036] Figure 10 This is a schematic diagram of the structure of the insert holder according to an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures: 1. Preheating heat exchanger box; 3. Air inlet; 4. Catalytic converter box; 5. Electric heating tube assembly; 6. Multi-layer catalytic module; 7. Support side plate; 8. Guide support groove; 9. Catalytic bed; 10. First flow hole; 11. Catalytic insert plate; 12. First adjusting screw; 13. Second flow hole; 14. Support rod; 15. Roller; 16. Blade; 17. Guide rail; 18. Adjusting rack; 19. Handle; 20. Guide adjusting screw; 21. Spring; 22. Insert holder; 23. Insert strip; 24. Vertical movable groove; 25. Inclined guide groove; 26. Second adjusting screw; 27. Guide rod; 28. Handle; 30. Drive gear; 31. Heat exchanger tube assembly; 32. Preheating chamber; 33. Connecting block. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figure 1-10 The present invention will now be described in further detail. Example

[0039] like Figure 1 As shown, the present invention provides a catalytic combustion furnace for waste gas treatment in PCB production, which mainly includes a lower preheating heat exchange unit and an upper catalytic reaction unit.

[0040] The preheating heat exchange unit includes a preheating heat exchange box 1, with a preheating chamber 32 at its bottom, inside which an auxiliary burner (not shown in the figure, such as a gas burner or heating wire) is installed. Heat exchange tube assemblies 31 are arranged above the preheating chamber 32. The catalytic reaction unit includes a catalytic box 4 fixed to the top of the preheating heat exchange box 1, with an exhaust port at its top. A multi-layer catalytic module 6 is located in the central area inside the catalytic box 4. This module consists of multiple independently removable catalytic beds 9 stacked vertically. Electric heating tube assemblies 5 are arranged around the top and left and right sides of the multi-layer catalytic module 6 to provide the heat required for the catalytic reaction.

[0041] like Figure 3 As shown, a support side plate 7 is fixed to the inner wall of the catalytic chamber 4, and a horizontal guide support groove 8 is opened on it. The two sides of the catalytic bed 9 are supported in the guide support groove 8 by rollers 15 at the ends of the support rods 14, so as to realize the smooth pulling of the entire catalytic bed 9.

[0042] When treating exhaust gas, the exhaust gas enters through inlet 3 and first flows downwards along the heat exchange tube assembly 31 to the preheating chamber 32, where it is initially heated by the auxiliary burner. The heated exhaust gas then rises through the gaps between the tubes of the heat exchange tube assembly 31, undergoing counter-current heat exchange with the cold exhaust gas flowing downwards within the tubes, thus achieving heat recovery. The preheated exhaust gas rises into the catalytic converter 4, where it reaches the optimal reaction temperature with the assistance of the electric heating tube assembly 5. It then sequentially passes through the catalyst layers on the multi-layer catalytic bed 9, undergoing a catalytic oxidation reaction. Finally, the purified gas is discharged from the exhaust port. This is existing technology and will not be elaborated further here. Example

[0043] Based on Example 1, such as Figure 3 and Figure 5 As shown, the bottom of the catalyst bed 9 has an array of first flow holes 10. A catalyst insert plate 11 is inserted into the bottom of the catalyst bed 9, and it has second flow holes 13 corresponding to the positions of the first flow holes 10. A first adjusting screw 12, rotated and mounted on the side wall of the catalyst bed 9, can drive the connecting block 33 and the catalyst insert plate 11 to move back and forth via a threaded connection, thereby changing the relative positions of the first flow holes 10 and the second flow holes 13, achieving stepless adjustment of the flow hole diameter. When it is necessary to replace the catalyst with a different particle size, simply rotate the first adjusting screw 12 after removing the catalyst bed 9 to match the particle size requirements of the new catalyst, without needing to replace the entire catalyst bed. Example

[0044] Based on Example 2, such as Figure 5 and Figure 7-10 As shown, multiple support rods 14 are installed in parallel inside the catalyst bed 9, with multiple blades 16 fixed circumferentially on each rod. The spacing between adjacent support rods 14 is greater than the width of the blades 16 to prevent interference during rotation. The two ends of the support rods 14 pass through vertical movable grooves 24 in the side wall of the catalyst bed 9 and are equipped with drive gears 30. Both drive gears 30 on both sides mesh with an adjusting rack 18. Pulling the handle 19 extending from the catalyst box 4 and the catalyst bed 9 will drive the adjusting rack 18 to move linearly, thereby driving all drive gears 30 and support rods 14 to rotate synchronously, causing the blades 16 to stir the catalyst or spread it evenly.

[0045] It should be noted that, in actual use, the distance between two adjacent support rods 14 can be slightly larger than the width of the blade 16. This creates a small flow gap between the two adjacent blades 16. When the exhaust gas passes through the first and second flow holes and reacts with the catalyst, it cannot move upward immediately. Most of it will be blocked by the blades 16, allowing the exhaust gas to flow out from the flow gap and both sides of the blades 16. During this process, the contact time between the exhaust gas and the catalyst is extended, thereby improving the utilization rate of the catalyst and increasing the catalytic efficiency.

[0046] The guide rail 17 provides sliding support for the adjusting rack 18. The guide adjusting screw 20 at the bottom of the rotating catalytic bed 9 can compress or release the spring 21, thereby changing the initial height position of the guide rail 17 and the adjusting rack 18, and realizing fine adjustment of the initial height of all blades 16. Example

[0047] Based on Example 3, such as Figure 6-10 As shown, the catalyst bed 9 also includes an insert rack 22, with inclined guide grooves 25 on the insert strips 23 on both sides. Support rods 14 pass through both the vertical movable groove 24 and the inclined guide grooves 25. Rotating the second adjusting screw 26 located on the side of the catalyst bed 9 drives the insert rack 22 and insert strips 23 to move horizontally. Due to the effect of the inclined guide grooves 25, the horizontal movement of the insert strips 23 forces the support rods 14 to rise and fall along the vertical movable groove 24, thereby achieving synchronous height adjustment of all support rods 14 and blades 16. This function can change the effective thickness or space of the catalyst bed, optimizing the reaction path and residence time. A handle 28 facilitates the overall pulling of the catalyst bed 9.

[0048] It should be noted that the rotation of the support rod 14 and the blade 16 has multiple functions. First, when the operator adds and lays the catalyst outside the catalytic chamber 4, pulling the handle 19 extending from the catalytic chamber 4 and the catalytic bed 9 will drive the adjusting rack 18 to move linearly, thereby driving all the drive gears 30 and the support rod 14 to rotate synchronously. Since there is a certain laying thickness distance between the blade 16 and the bottom of the catalytic bed 9, the catalyst can be evenly laid on the bottom of the catalytic bed 9. Second, when the exhaust gas reacts with the catalyst inside the catalytic chamber 4, driving the support rod 14 and the blade 16 to rotate synchronously can drive the blade 16 to stir the catalyst, improving the catalytic reaction effect and the utilization rate of the catalyst. Third, when the catalytic bed 9 needs to be cleaned after catalysis, the second adjusting screw 26 located on the side of the catalytic bed 9 can be rotated to drive the insert rack 22 and the insert strip 23 to move horizontally. Due to the effect of the inclined guide groove 25, the horizontal movement of the insert 23 will force the support rod 14 to rise and fall along the vertical movable groove 24, thereby realizing the synchronous height adjustment of all support rods 14 and blades 16. Adjust the blades 16 to contact the bottom of the catalyst bed 9. At this time, drive the blades to rotate so that the catalyst bed 9 can be cleaned by the blades without the need for additional cleaning tools. Fourth, the effective thickness or space of the catalyst bed can be adjusted by adjusting the height of the support rods 14 and blades 16, thereby optimizing the reaction path and residence time.

[0049] It should be noted that blade 16 can be made of high-temperature resistant materials.

[0050] The working principle of the catalytic combustion furnace for waste gas treatment in PCB production provided by this invention is as follows: Waste gas treatment: After being preheated by countercurrent heat exchange, supplemented by auxiliary burner heating, and finely heated by electric heating tube group, the waste gas enters the multi-layer catalytic bed to complete the purification. The catalyst insert plate 11 is adjusted by the first adjusting screw 12 to change the flow orifice diameter and adapt to catalysts of different particle sizes. By driving the adjusting rack 18 through the handle 19, all the blades 16 are rotated, which disturbs the catalyst bed, prevents channeling, and improves efficiency. The initial height of the blade 16 is changed by adjusting the spring 21 through the guide adjusting screw 20, thereby changing the catalyst stacking state and reaction space; The second adjusting screw 26 drives the insert frame 22 to raise and lower all support rods 14 and blades 16 as a whole, thereby changing the catalyst stacking state and reaction space. When the catalyst needs to be replaced or maintenance is required, simply grasp the handle 28 and pull out the corresponding catalyst bed 9 along the guide support groove 8. The operation is simple and quick.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A catalytic combustion furnace for waste gas treatment in PCB production, comprising a preheating heat exchange unit and a catalytic reaction unit located above it, wherein the preheating heat exchange unit includes a preheating heat exchange box (1), a preheating chamber (32) is provided at the bottom of the inner side of the preheating heat exchange box (1), and a heat exchange tube assembly (31) is provided inside the preheating heat exchange box (1) and above the preheating chamber (32); the catalytic reaction unit includes a catalytic box (4) installed on the top of the preheating heat exchange box (1), an exhaust port is provided on the top of the catalytic box (4), and a multi-layer catalytic module (6) is provided inside the catalytic box (4), characterized in that: The multi-layer catalytic module (6) includes multiple catalytic beds (9), which are arranged in multiple layers and pulled out and installed in the catalytic box (4); it also includes an electric heating tube group (5) surrounding the top and sides of the multi-layer catalytic module (6).

2. The catalytic combustion furnace for waste gas treatment in PCB production according to claim 1, characterized in that: The bottom of the catalyst bed (9) is provided with a plurality of first flow holes (10). A catalyst insert plate (11) is inserted into the bottom inner side of the catalyst bed (9). A second flow hole (13) is provided on the catalyst insert plate (11) and above the first flow holes (10). A first adjusting screw (12) is rotatably provided on the side wall of the catalyst bed (9) located outside the catalyst box (4). A connecting block (33) is fixed on the top of the catalyst insert plate (11) near the end of the first adjusting screw (12). The first adjusting screw (12) is threadedly connected to the connecting block (33).

3. A catalytic combustion furnace for waste gas treatment in PCB production according to claim 1, characterized in that: Inside the catalyst box (4) and on both sides of the catalyst bed (9), there are fixed support side plates (7). On the support side plates (7) and on one side of the catalyst bed (9), there are guide support grooves (8). Several support rods (14) are inserted inside the catalyst bed (9). The two ends of the support rods (14) are rotatably connected to rollers (15) that match the guide support grooves (8). The catalyst bed (9) is inserted between the two support side plates (7) through the support rods (14) and the rollers (15).

4. A catalytic combustion furnace for waste gas treatment in PCB production according to claim 3, characterized in that: The support rod (14) has multiple blades (16) arranged circumferentially on its outer side, and the distance between the central axes of two adjacent support rods (14) is greater than or equal to the width of the two blades (16).

5. A catalytic combustion furnace for waste gas treatment in PCB production according to claim 4, characterized in that: The catalyst bed (9) has a rotary drive mechanism on both sides inside, which is used to drive the support rod (14) and the blade (16) to rotate.

6. A catalytic combustion furnace for waste gas treatment in PCB production according to claim 5, characterized in that: The rotary drive mechanism includes drive gears (30) fixed at both ends of the outer side of the support rod (14) and an adjusting rack (18) slidably disposed on both sides inside the catalyst bed (9) and located below the drive gears (30). Multiple drive gears (30) located on the same side are meshed with the adjusting rack (18). One end of the adjusting rack (18) is fixed with a handle (19), which extends out of the catalyst bed (9) and the catalyst box (4).

7. A catalytic combustion furnace for waste gas treatment in PCB production according to claim 6, characterized in that: Vertical movable grooves (24) are vertically opened on both sides of the catalyst bed (9) and outside the support rod (14). The support rod (14) is slidably and rotatably disposed inside the corresponding vertical movable groove (24). A guide rail (17) is provided inside the catalyst bed (9) and below the handle (19). The handle (19) is slidably connected to the top of the guide rail (17). Several guide adjustment screws (20) are inserted into the bottom inner side of the guide rail (17). The guide rail (17) is slidably disposed on the several guide adjustment screws (20). A spring (21) is sleeved on the outside of the guide adjustment screw (20). The two ends of the spring (21) respectively abut against the bottom of the guide rail (17) and the bottom of the inner side of the catalyst bed (9). The guide adjustment screw (20) extends out of the bottom of the catalyst bed (9) and is threadedly connected to the catalyst bed (9).

8. A catalytic combustion furnace for waste gas treatment in PCB production according to claim 7, characterized in that: An inserter (22) is inserted into the inner side of the catalyst bed (9). Insert strips (23) are provided on both sides of the inserter (22). The insert strips (23) are inserted and slidably connected to the inner side of the catalyst bed (9). An inclined guide groove (25) is provided on the insert strip (23) at a position corresponding to the vertical movable groove (24). The support rod (14) passes through the inner side of the corresponding vertical movable groove (24) and the inclined guide groove (25). A handle (28) is fixedly installed at one end of the catalyst bed (9) and outside the catalyst box (4). A guide rod (27) is provided at one end of the inserter (22) near the handle (28). The guide rod (27) is inserted into the inner side of the catalyst bed (9) and slidably connected to the catalyst bed (9). A second adjusting screw (26) is rotatably connected at one end of the inserter (22) near the guide rod (27). The second adjusting screw (26) is threadedly connected to the side wall of the catalyst bed (9).

9. A catalytic combustion furnace for waste gas treatment in PCB production according to claim 1, characterized in that: An auxiliary burner is provided in the preheating chamber (32) for initial heating of the exhaust gas flowing down into the preheating chamber (32).

10. A method for treating waste gas from a catalytic combustion furnace used in PCB manufacturing, according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Exhaust gas enters from the inlet (3) and flows down to the preheating chamber (32) through the top of the heat exchange tube group (31). S2: After the exhaust gas descends to the inside of the preheating chamber (32) is heated, the exhaust gas rises and diffuses upward through the gap of the heat exchange tube assembly (31) and exchanges heat with the exhaust gas descending in the tube in a countercurrent manner. S3: The heated exhaust gas enters the multi-layer catalytic module (6) inside the catalytic box (4) and undergoes catalytic oxidation reaction under the combined action of the catalyst and the electric heating tube group (5); S4: The purified gas is discharged through the exhaust port.

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