A waste gas catalytic combustion device with multi-stage flow guide structure
By employing a multi-stage flow guiding structure and a dynamic compensation mechanism, the problems of uneven airflow distribution and loose catalyst in the waste gas catalytic combustion device were solved, thereby improving airflow uniformity and catalyst bed stability and extending the service life of the device.
Patent Information
- Application Number
- CN202521986485.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-16
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-16
AI Technical Summary
Existing catalytic combustion devices for waste gas suffer from uneven airflow distribution and poor catalyst bed stability, resulting in excessively high flow velocity at the edge of the airflow and excessively low flow velocity at the center, leading to short circuits. Furthermore, the catalyst is prone to loosening and deactivation due to vibration or airflow impact.
It adopts a multi-stage flow guiding structure, including components such as a flow guiding plate, a tapered honeycomb hole, a rotating rod, an adjusting plate, and a cylinder. The flow is forced to converge through the tapered honeycomb hole, and the wind speed is adjusted by feedback from a flow velocity sensor. Combined with a reset spring, the vibration of catalyst particles is dynamically compensated to enhance the stability of the bed.
This achieves uniform airflow distribution, improves the stability and service life of the catalyst bed, and reduces the risk of catalyst sintering and deactivation.
Smart Images
Figure CN224680794U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of waste gas treatment technology, specifically relating to a waste gas catalytic combustion device with a multi-stage flow guiding structure. Background Technology
[0002] Environmental protection is a perennial and ever-evolving theme. With the advancement of industrialization, people have gradually become aware of the contradiction between the ever-increasing demands of development and the natural environment. Industrial manufacturing environments, especially those in the production of electronic components, batteries, pickling workshops, laboratory exhaust systems, metallurgy, chemical plants, pharmaceutical manufacturing plants, painting workshops, food and brewing, furniture production, catering, and plastic products industries, generate large amounts of organic gases such as toluene, xylene, benzene, phenols, esters, and aldehydes, as well as malodorous gases and various waste gases containing trace amounts of heavy metals. If these are released into the atmosphere without treatment, they will cause environmental pollution.
[0003] Current VOCs catalytic combustion devices typically consist of an inlet, a preheating chamber, a catalyst bed, and a combustion chamber. After preheating, the waste gas enters the catalyst bed, where it undergoes an oxidation reaction under the action of the catalyst, converting into CO2 and H2O. However, existing technologies have the following problems: 1. Uneven airflow distribution: Traditional guide vanes have a simple design, resulting in excessively high flow velocity at the edges and excessively low flow velocity in the central area when exhaust gas enters the catalyst bed, creating a "short circuit" phenomenon; 2. Catalyst loading defects: Due to vibration or airflow impact, the bed is locally loose, resulting in differences in porosity and concentration of high-temperature areas, making the catalyst prone to sintering and deactivation.
[0004] Therefore, the present invention provides a waste gas catalytic combustion device with a multi-stage flow guiding structure and uniform airflow distribution, which meets market demand. Utility Model Content
[0005] The technical problem to be solved by this utility model is a waste gas catalytic combustion device with a multi-stage flow guiding structure.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a waste gas catalytic combustion device with a multi-stage flow guiding structure, including a catalytic combustion reactor, an infrared thermal imaging module, and a flow rate sensor. The catalytic combustion reactor has a catalyst bed inside, a connecting pipe fixedly connected to the bottom of the reactor, and a preheating component fixedly connected to the outside of the connecting pipe. The multi-stage flow guiding component includes a mounting frame, an internal flow guiding plate, and uniformly spaced tapered honeycomb holes inside the plate. Two rotating rods are rotatably connected inside the catalytic combustion reactor, and adjusting plates are fixedly connected to the outside of each rod. A transmission gear is fixedly connected to the distal end of each rod, and a sector gear meshes with the outside of the transmission gear. A cylinder is rotatably connected to the outside of the sector gear. A clamping component includes a fixing frame fixedly connected to the inside of the catalytic combustion reactor. A sleeve is uniformly fixedly connected to the bottom of the fixing frame, a sliding rod is slidably connected inside the sleeve, and a return spring is fixedly connected to the top of the sliding rod. During operation, the exhaust gas is heated by the preheating component and then enters the catalytic combustion reactor through the connecting pipe. The gas entering the reactor is evenly distributed by the flow-guiding plate, and the gradually decreasing honeycomb holes further concentrate the gas after passing through the flow-guiding plate, forcing the airflow to converge towards the center. Simultaneously, the cylinder drives the sector gear to rotate, which in turn drives the meshing transmission gear. The rotation of the transmission gear drives the rotating rod and the adjusting plate to rotate. The two opposing adjusting plates can rotate along the two rotating rods to open and close in a fan shape, thereby adjusting the wind speed. During the process, the flow rate sensor provides feedback to control the cylinder to adjust the opening and closing angle, balancing the flow rate at the edge and center. During operation, the spring force of the return spring acts in the opposite direction on the sliding rod, causing the sliding rod to exert a reverse force on the catalyst bed. This allows the spring force to dynamically compensate for the vibration and loosening of the catalyst particles, improving the stability of the catalyst bed and extending its service life.
[0007] In some embodiments, the diameter of the tapered honeycomb holes decreases from bottom to top, and the flow distribution plate is located at the bottom of the regulating plate. The tapered honeycomb holes can force the airflow to converge towards the center, so that the airflow is concentrated and delivered to the regulating plate.
[0008] In some embodiments, the sector gear shaft is connected to the outside of the catalytic combustion reactor, and the cylinder is fitted to the outside of the catalytic combustion reactor. The cylinder can drive the sector gear to rotate, which in turn can drive the transmission gear to rotate and adjust the rod and the adjusting plate.
[0009] In some embodiments, the return spring is sleeved inside the sleeve, and a pressure plate is fixedly connected to the bottom of the slide rod. The pressure plate can increase the contact surface between the bottom of the slide rod and the catalyst bed, and dynamically compensate for the vibration and loosening of the catalyst particles through the spring force.
[0010] In some embodiments, a high-temperature resistant ceramic fiber layer is fixedly connected to the bottom of the catalyst bed, and the high-temperature resistant ceramic fiber layer covers the surface of the catalyst bed to prevent the direct impact of airflow from causing particle displacement. The catalyst bed adopts a cordierite honeycomb carrier and is coated with a Pt-Pd catalyst.
[0011] In some embodiments, the preheating assembly includes a preheating chamber fixedly connected to the bottom of a connecting pipe, and an air inlet pipe fixedly connected to the left end of the preheating chamber. Exhaust gas can enter the preheating chamber through the air inlet pipe, and after being heated by the preheating chamber, it enters the interior of the catalytic combustion reactor through the connecting pipe.
[0012] In some embodiments, the high-temperature resistant ceramic fiber layer is fixed to the frame edge of the catalyst bed by bolts, and the high-temperature resistant ceramic fiber layer has a thickness of 10 mm and a temperature resistance of 1200°C.
[0013] The scope of this utility model is not limited to technical solutions formed by specific combinations of the above-mentioned technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalent features. For example, technical solutions formed by substituting the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.
[0014] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: When in use, the exhaust gas is heated by the preheating component and enters the interior of the catalytic combustion reactor through the connecting pipe. The gas entering the catalytic combustion reactor can be evenly distributed by the flow guide plate. At the same time, the gas is more concentrated after passing through the flow guide plate by the gradually narrowing honeycomb holes. The diameter of the gradually narrowing honeycomb holes decreases from bottom to top, forcing the airflow to converge towards the center. At the same time, the cylinder drives the sector gear to rotate, which in turn drives the transmission gear to rotate. When the transmission gear rotates, it drives the rotating rod and the adjusting plate to rotate. The two opposing adjusting plates can rotate along the two rotating rods to open and close in a sector shape, thereby adjusting the wind speed. During the process, the flow rate sensor feeds back to control the cylinder to adjust the opening and closing angle, balancing the flow rate at the edge and the center. During operation, the elastic force of the return spring acts in the opposite direction on the slide rod, which causes the slide rod to exert a reverse force on the catalyst bed. This allows the elastic force to dynamically compensate for the vibration and loosening of the catalyst particles, improving the stability of the catalyst bed and extending its service life. Attached Figure Description
[0015] Figure 1This is a schematic diagram of the external structure of a waste gas catalytic combustion device with a multi-stage flow guiding structure. Figure 2 This is a schematic diagram of the internal structure of a cross-section of a waste gas catalytic combustion device with a multi-stage flow guiding structure. Figure 3 This is a structural diagram showing the internal disassembly of a waste gas catalytic combustion device with a multi-stage flow guiding structure. Figure 4 This is a schematic diagram of the external structure of a sector gear in a waste gas catalytic combustion device with a multi-stage flow guiding structure. Figure 5 A catalytic combustion device for waste gas with a multi-stage flow guiding structure Figure 3 Enlarged structural diagram at point A; Figure 6 A catalytic combustion device for waste gas with a multi-stage flow guiding structure Figure 4 Enlarged structural diagram at point B; in: 1. Catalytic combustion reactor; 2. Preheating chamber; 3. Inlet pipe; 4. Connecting pipe; 5. Infrared thermal imaging module; 6. Mounting frame; 7. Flow distribution plate; 8. Rotating rod; 9. Adjusting plate; 10. Catalyst bed; 11. Fixing frame; 12. High-temperature resistant ceramic fiber layer; 13. Sleeve; 14. Sliding rod; 15. Pressure plate; 16. Return spring; 17. Cylinder; 18. Sector gear; 19. Transmission gear; 20. Flow rate sensor. Detailed Implementation
[0016] like Figure 1-6 As shown, this utility model provides a waste gas catalytic combustion device with a multi-stage flow guiding structure, including: a catalytic combustion reactor 1, an infrared thermal imaging module 5, and a flow rate sensor 20.
[0017] The catalytic combustion reactor 1 has a catalyst bed 10 inside, a connecting pipe 4 fixedly connected to the bottom of the reactor 1, and a preheating component fixedly connected to the outside of the connecting pipe 4; a multi-stage flow guiding component, including a mounting frame 6, a flow guiding plate 7 inside the mounting frame 6, and tapered honeycomb holes evenly opened inside the flow guiding plate 7; two rotating rods 8 rotatably connected inside the catalytic combustion reactor 1, an adjusting plate 9 fixedly connected to the outside of each of the two rotating rods 8, a transmission gear 19 fixedly connected to the far end of each of the two rotating rods 8, a sector gear 18 meshing with the outside of the transmission gear 19, and a cylinder 17 rotatably connected to the outside of the sector gear 18; and a clamping component, including a fixing frame 11 fixedly connected inside the catalytic combustion reactor 1, a sleeve 13 evenly fixedly connected to the bottom of the fixing frame 11, a sliding rod 14 slidably connected inside the sleeve 13, and a return spring 16 fixedly connected to the top of the sliding rod 14. During use, the exhaust gas is heated by the preheating component and then passes through the connecting pipe. 4. The gas enters the interior of the catalytic combustion reactor 1. The flow distribution plate 7 can evenly distribute the gas entering the catalytic combustion reactor 1. At the same time, the gradually narrowing honeycomb holes can make the gas more concentrated after passing through the flow distribution plate 7. The diameter of the gradually narrowing honeycomb holes decreases from bottom to top, forcing the airflow to converge towards the center. Simultaneously, the cylinder 17 drives the sector gear 18 to rotate, which in turn drives the meshing transmission gear 19 to rotate. When the transmission gear 19 rotates, it drives the rotating rod 8 and the adjusting plate 9 to rotate. The two opposing adjusting plates 9 can rotate along the two rotating rods 8 to open and close in a fan shape, thereby adjusting the wind speed. During the process, the flow rate sensor 20 feeds back to control the cylinder 17 to adjust the opening and closing angle, balancing the flow rate at the edge and the center. During operation, the elastic force of the return spring 16 acts in the opposite direction on the slide rod 14, which causes the slide rod 14 to exert a reverse force on the catalyst bed 10. This allows the elastic force to dynamically compensate for the vibration and loosening of the catalyst particles, improving the stability of the catalyst bed 10 and extending its service life.
[0018] The diameter of the tapered honeycomb holes decreases from bottom to top. The flow distribution plate 7 is located at the bottom of the regulating plate 9. The tapered honeycomb holes can force the airflow to converge towards the center, so that the airflow is concentrated and delivered to the regulating plate 9. The shaft of the sector gear 18 is connected to the outside of the catalytic combustion reactor 1. The cylinder 17 is fitted to the outside of the catalytic combustion reactor 1. The cylinder 17 can drive the sector gear 18 to rotate, which can further drive the transmission gear 19 to drive the rotating rod 8 and the regulating plate 9 to rotate and adjust. The reset spring 16 is sleeved inside the sleeve 13. The bottom of the slide rod 14 is fixedly connected to the pressure plate 15. The pressure plate 15 can increase the contact surface between the bottom of the slide rod 14 and the catalyst bed 10. The spring force dynamically compensates for the vibration and loosening of the catalyst particles.
[0019] A high-temperature resistant ceramic fiber layer 12 is fixedly connected to the bottom of the catalyst bed 10. The high-temperature resistant ceramic fiber layer 12 covers the surface of the catalyst bed and can prevent the direct impact of airflow from causing particle displacement. The catalyst bed 10 uses cordierite honeycomb carrier and is coated with Pt-Pd catalyst. The preheating component includes a preheating chamber 2, which is fixedly connected to the bottom of the connecting pipe 4. An air inlet pipe 3 is fixedly connected to the left end of the preheating chamber 2. Exhaust gas can enter the preheating chamber 2 through the air inlet pipe 3. After the gas is heated by the preheating chamber 2, it enters the interior of the catalytic combustion reactor 1 through the connecting pipe 4. The high-temperature resistant ceramic fiber layer 12 is fixed to the frame edge of the catalyst bed 10 by bolts. The high-temperature resistant ceramic fiber layer 12 has a thickness of 10 mm and a temperature resistance of 1200℃.
[0020] The infrared thermal imaging module 5 is installed above the catalyst bed 10. The data is transmitted to the PLC controller. When a temperature difference > 20°C is detected, the opening of the corresponding adjustment plate 9 and the power of the auxiliary heater are automatically adjusted.
[0021] When this waste gas catalytic combustion device with a multi-stage flow guiding structure is in use, the gas entering the catalytic combustion reactor 1 can be evenly distributed through the flow guiding plate 7. At the same time, the cylinder 17 drives the sector gear 18 to rotate, which in turn drives the transmission gear 19 to rotate. When the transmission gear 19 rotates, it drives the rotating rod 8 and the adjusting plate 9 to rotate. The two opposing adjusting plates 9 can rotate along the two rotating rods 8 to open and close in a sector shape. The spring force of the return spring 16 acts in the opposite direction on the slide rod 14, which in turn causes the slide rod 14 to exert a reverse force on the catalyst bed 10.
[0022] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A catalytic combustion device for waste gas with a multi-stage flow guiding structure, comprising a catalytic combustion reactor (1), an infrared thermal imaging module (5), and a flow rate sensor (20), characterized in that: The catalyst bed (10) is provided inside the catalytic combustion reactor (1), and a connecting pipe (4) is fixedly connected to the bottom of the catalytic combustion reactor (1). A preheating component is fixedly connected to the outside of the connecting pipe (4). A multi-stage flow guiding assembly includes a mounting frame (6), an internal flow guiding plate (7) of the mounting frame (6), and a gradually narrowing honeycomb hole uniformly opened inside the flow guiding plate (7). Two rotating rods (8) are rotatably connected inside the catalytic combustion reactor (1). An adjusting plate (9) is fixedly connected to the outside of each of the two rotating rods (8). A transmission gear (19) is fixedly connected to the far end of each of the two rotating rods (8). A sector gear (18) is meshed with the outside of the transmission gear (19). A cylinder (17) is rotatably connected to the outside of the sector gear (18). The clamping assembly includes a fixing frame (11), which is fixedly connected to the inside of the catalytic combustion reactor (1). A sleeve (13) is uniformly fixedly connected to the bottom of the fixing frame (11), and a sliding rod (14) is slidably connected inside the sleeve (13). A return spring (16) is fixedly connected to the top of the sliding rod (14).
2. The waste gas catalytic combustion device with a multi-stage flow guiding structure according to claim 1, characterized in that: The diameter of the tapered honeycomb holes decreases from bottom to top, and the flow distribution plate (7) is located at the bottom of the adjustment plate (9).
3. The waste gas catalytic combustion device with a multi-stage flow guiding structure according to claim 1, characterized in that: The sector gear (18) shaft is connected to the outside of the catalytic combustion reactor (1), and the cylinder (17) is fitted to the outside of the catalytic combustion reactor (1).
4. The waste gas catalytic combustion device with a multi-stage flow guiding structure according to claim 1, characterized in that: The reset spring (16) is sleeved inside the sleeve (13), and the bottom of the slide rod (14) is fixedly connected to the pressure plate (15).
5. The waste gas catalytic combustion device with a multi-stage flow guiding structure according to claim 1, characterized in that: A high-temperature resistant ceramic fiber layer (12) is fixedly connected to the bottom of the catalyst bed (10).
6. The waste gas catalytic combustion device with a multi-stage flow guiding structure according to claim 1, characterized in that: The preheating assembly includes a preheating chamber (2), which is fixedly connected to the bottom of the connecting pipe (4), and an air inlet pipe (3) is fixedly connected to the left end of the preheating chamber (2).
7. The waste gas catalytic combustion device with a multi-stage flow guiding structure according to claim 5, characterized in that: The high-temperature resistant ceramic fiber layer (12) is fixed to the frame edge of the catalyst bed (10) by bolts.