Efficient and stable gas mixing device

Abstract

The invention belongs to the technical field of gas mixers, and particularly discloses an efficient and stable gas mixing device. The upper portion of a shell of the device slidably penetrates through an upper fixing frame, the lower portion of the shell is fixed, the shell is sequentially divided into a preheating area, a mixing area and a reaction area, and at least two gas inlet pipelines are arranged on the shell; the mixer is arranged in the mixing area, the upper and lower ends of the internal pipe are hermetically connected with the inner wall of the mixing area respectively, and a plurality of gas distribution plates for guiding gas flow distribution are sequentially arranged at two ends and inside the internal pipe; the thermocouple guide pipe sequentially penetrates through the upper fixing frame, the preheating area and the mixer. The gas inlet pipeline sequentially penetrates through the upper fixing frame and the preheating area and extends into the mixer, and the end, outside the shell, of the gas inlet pipeline is connected with a gas supply source through a gas flow meter; one end of the mixed gas outlet pipeline penetrates through the lower fixing frame and extends into the reaction area, and the other end is connected with an analytical instrument. The device has the characteristics of compact structure, high mixing efficiency, small concentration difference, few side reactions, good stability and strong adaptability.

Description

Technical Field

[0001] This invention belongs to the field of gas mixer technology, specifically relating to a highly efficient and stable gas mixing device with a compact structure, high mixing efficiency, small concentration difference, few side reactions, good stability, and strong adaptability. Background Technology

[0002] In many industrial sectors such as chemical engineering, energy, and environmental protection, numerous gas-solid catalytic reactions and gas processing processes are involved, and gas mixing devices are key equipment in these processes. A gas mixing device is a device that uniformly mixes different gases to provide suitable conditions for subsequent reactions or treatments.

[0003] Currently, gas mixing devices come in various types. For example, dynamic mixing devices achieve precise mixing by real-time control of the flow ratio of multiple gases, relying on a mass flow controller (MFC) and a closed-loop feedback system. These offer advantages such as high precision, fast response, and high flexibility, meeting diverse gas mixing needs; however, they also have drawbacks, such as requiring complex integrated piping, higher equipment costs, and demanding requirements on the operating environment and operators. Static mixing devices, on the other hand, change the fluid flow direction using fixed internal components (such as spiral vanes, baffles, orifice plates) and utilize shearing, diffusion, and convection to achieve mixing. These devices are not only less expensive but also simpler to operate; however, they suffer from lower precision due to large local concentration differences and insufficient micro-mixing when handling large flow rates or complex gas compositions. They also tend to be larger, more time-consuming, and less flexible, and are mostly used in scenarios where high precision requirements are not critical and a single concentration needs to be output long-term. In addition, there are mixing devices with specially designed mixing chamber structures, such as dividing the mixing chamber into an upper chamber and a lower chamber. The inner wall of the upper chamber is an arc-shaped surface, and the air intake channels are symmetrically connected to the lower chamber and arranged tangentially. This allows the airflow to form lateral cutting-in countercurrent and swirling flow after entering, enhancing the mixing capacity. These specially structured mixing devices can improve the degree of gas mixing. Compared to some traditional structures, they can improve the mixing effect to a certain extent, and the structure is relatively simple, requiring no complex control system. However, the mixing effect may be affected by factors such as airflow velocity and gas type. For some high-requirement mixing scenarios, further structural optimization or combination with other technologies may be necessary. Furthermore, there are pressure-distributing gas devices that sequentially distribute gas according to the partial pressure of each component. The control system controls the valves corresponding to each component gas to open sequentially, and closes the valves after the gas pressure in the distribution tank reaches the corresponding partial pressure, until the gas pressure in the distribution tank reaches the set pressure. It eliminates the need for precision and expensive components such as mass and flow controllers, reducing the manufacturing cost of gas mixing devices. It also boasts good environmental adaptability, with mature temperature control and pressure sensor technologies ensuring reliable performance in various environments. However, the gas mixing process is relatively complex, requiring precise temperature and pressure control, and the mixing time can be lengthy, making it unsuitable for scenarios requiring rapid gas mixture generation. Furthermore, most existing mixing devices experience significant pressure losses during operation, leading to increased energy consumption and costs, affecting reaction stability, and exhibiting poor adaptability and flexibility to changes in gas flow rate and composition, making it difficult to meet diverse reaction requirements.

[0004] Therefore, it is necessary to design a new gas mixing device that is suitable for efficient, rapid, and stable mixing of multi-component gases to overcome the shortcomings of existing devices. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a highly efficient and stable gas mixing device that features a compact structure, high mixing efficiency, small concentration differences, few side reactions, good stability, and strong adaptability.

[0006] The efficient and stable gas mixing device of this invention is achieved as follows: it includes a housing, a gas inlet pipe, a mixed gas outlet pipe, a mixer, and a thermocouple guide pipe. The shell is a vertically arranged cylinder with open top and bottom. The upper and lower ends of the shell are open, and the upper part slides through the upper fixed frame and is sealed and fixedly connected to the upper connecting structure above the upper fixed frame. The lower part is detachably sealed and fixedly connected to the lower fixed frame. The shell is divided into a preheating zone, a mixing zone, and a reaction zone from top to bottom. The preheating zone and the mixing zone are surrounded by a controllable heat source. At least two gas inlet pipes connected to an external gas source are arranged at intervals inside the shell. The mixer is disposed in the mixing zone of the housing. The mixer includes an internal tube and a gas distribution plate. The upper and lower ends of the internal tube are respectively sealed to the inner wall of the mixing zone. Multiple gas distribution plates for guiding airflow distribution are arranged sequentially from top to bottom at both ends and inside the internal tube. The thermocouple guide tube passes through the upper fixed frame, the preheating zone and the mixer from top to bottom, and a thermocouple for monitoring the temperature of the mixed gas is installed inside the thermocouple guide tube. The gas inlet pipe passes through the upper fixed frame and the preheating zone from top to bottom and extends into the mixer. One end of the gas inlet pipe outside the housing is connected to the corresponding gas supply source through a gas flow meter. One end of the mixed gas outlet pipeline passes through the lower fixed frame and extends into the reaction zone, while the other end is connected to the analytical instrument.

[0007] The internal tube includes a first variable diameter section, a constant diameter section, and a second variable diameter section. The first variable diameter section, the constant diameter section, and the second variable diameter section are concentric cylindrical bodies with different diameters that are sealed and connected sequentially from top to bottom. The first variable diameter section is a hollow structure with an inverted frustum and its large diameter end is sealed to the inner wall of the mixing zone. The constant diameter section is a straight cylindrical body and its top end is sealed to the small diameter end of the first variable diameter section. The second variable diameter section is a symmetrical hourglass structure with the pipe diameter first contracting and then expanding along the central axis, and the middle diameter is significantly smaller than the diameters of the two end ports. The upper inlet of the second variable diameter section has the same pipe diameter as the constant diameter section and is sealed to it. The lower end of the second variable diameter section is sealed to the inner wall of the mixing zone.

[0008] Furthermore, the gas distribution plate includes a first distribution plate, a second distribution plate, a third distribution plate, a fourth distribution plate, a fifth distribution plate, and a sixth distribution plate arranged in parallel from top to bottom, and the thermocouple guide tube passes through the first distribution plate, the second distribution plate, the third distribution plate, the fourth distribution plate, the fifth distribution plate, and the sixth distribution plate in sequence. The first distribution plate is located at the top of the first variable diameter section and has a first hole corresponding to the gas inlet pipe. The lower part of the gas inlet pipe passes through the first hole and has an outlet hole in the first variable diameter section. The second distribution plate is located at the bottom of the first variable diameter section and has 1 to 4 second holes. The third, fourth, and fifth distribution plates are arranged sequentially from top to bottom within the equal diameter section. The third distribution plate has one third hole. The fourth distribution plate has multiple fourth holes that are evenly distributed and inclined around the central axis of the shell. The fifth distribution plate has multiple fifth holes that are evenly distributed and inclined around the central axis of the shell. The sixth distribution plate is located at the top of the second variable diameter section and has multiple fan-shaped openings that are evenly distributed around the central axis of the shell.

[0009] Furthermore, a baffle is provided between the second distribution plate and the third distribution plate on one side of the central axis of the shell. The upper end, lower end and outer side of the baffle are respectively sealed to the bottom end of the second distribution plate, the top end of the third distribution plate and the inner wall of the equal diameter section. The second hole on the second distribution plate is located on the side close to the baffle, and the third hole on the third distribution plate is located on the other side close to the baffle. The angle between the third hole and the second hole farthest from the baffle does not exceed 180°.

[0010] Furthermore, the first included angle between the central axis of the fourth hole and the central axis of the shell is an acute or obtuse angle, the second included angle between the central axis of the fifth hole and the central axis of the shell is an acute or obtuse angle, the sum of the included angles between the fourth hole and the corresponding fifth hole is an obtuse angle, and the axial projections of the fourth hole outlet on the fourth distribution plate and the corresponding fifth hole inlet on the fifth distribution plate are staggered.

[0011] Furthermore, the thermocouple guide tube and the inner tube are coaxial with the shell, and the thermocouple is slidably disposed inside the thermocouple guide tube with the temperature measuring point of the thermocouple located above the solid catalyst in the reaction zone.

[0012] Furthermore, the gas inlet pipeline includes an outer gas inlet pipe and an inner gas inlet pipe. An air inlet is provided on the upper connecting structure. One end of the outer gas inlet pipe is connected to the corresponding gas supply source through a gas flow meter, and the other end is detachably sealed to the air inlet. The inner gas inlet pipe is located in the preheating zone, penetrates the first distribution plate at the bottom, and is connected to the air inlet at the top.

[0013] Furthermore, at least one first gas inlet pipe with a radius greater than 4 times the radius of the other gas inlet pipes is provided at intervals on the housing. The gas inlet inner pipe corresponding to the gas inlet pipe other than the first gas inlet pipe on the housing is provided with a filling column. The length of the filling column is 1 to 5 cm shorter than the length of the gas inlet inner pipe.

[0014] Furthermore, all components of the housing, gas inlet inner tube, thermocouple guide tube, filling column, and mixer are made of quartz and / or ceramic materials and designed for a temperature greater than 1000°C.

[0015] Furthermore, the bottom of the gas inlet inner tube is sealed, the upper end of the gas inlet inner tube is connected to the air inlet and a sealing gasket is provided between the gas inlet and the air inlet, the lower end of the gas inlet inner tube extends to the space between the first distribution plate and the second distribution plate, and multiple air outlet holes are provided on the outer tube wall between the first distribution plate and the second distribution plate at a distance of 3-4 mm from the bottom end.

[0016] The present invention has the following beneficial effects: 1. This invention vertically integrates the preheating zone, mixing zone, and reaction zone into a compact housing, and adopts an integrated coaxial design of "housing-mixer-thermocouple guide tube". Moreover, the internal tubes of the mixer (first variable diameter section, constant diameter section, and second variable diameter section) are coaxially sealed with the housing, and the thermocouple guide tube runs through each area and is coaxial with the internal tube. This not only greatly shortens the process path and time from mixing to reaction, realizing "rapid mixing and immediate reaction", but also significantly reduces the overall size of the device and the piping design, avoiding the space waste caused by the dispersed arrangement of multiple components in traditional devices. At the same time, it simplifies the installation process and reduces the difficulty of on-site deployment.

[0017] 2. This invention utilizes six gas distribution plates arranged from top to bottom within the mixer, combined with a variable-diameter design of the internal pipes (e.g., the first variable-diameter section is a hollow truncated cone structure, and the second variable-diameter section is an hourglass-shaped structure), to form a multi-stage mixing path of "diversion-countercurrent-rotation-diffusion". For example, the first distribution plate guides the precise gas distribution in the gas inlet pipe; the second and third distribution plates, through baffles, extend the mixing path of the gas to be mixed and avoid gas "short circuits", thereby increasing the mixing time and improving the mixing effect; the fourth and fifth distribution plates, through the staggered arrangement of inclined holes, generate rotational shear force in the airflow to improve mixing efficiency; and the sixth distribution plate, with its fan-shaped opening, facilitates further thorough mixing of the gas through deflection and countercurrent; in particular, the sum of the included angles of the holes in the fourth and fifth distribution plates is an obtuse angle, and their axial projections are misaligned, further enhancing fluid disturbance. This completely solves the problem of "large local concentration differences of large flow rates / complex component gases" in traditional static mixing devices, and significantly improves the micro-mixing uniformity, thereby allowing the concentration difference to be controlled within a lower range. In particular, the baffle design between the second and third distribution plates, combined with the "inverted frustum" structure of the first variable-diameter section, can achieve airflow convergence, causing the gas to form a directional flow counterflow in the mixing zone, thereby shortening the mixing time. Through the above structural innovations, this invention effectively breaks the laminar flow state of the gas by dividing, turning, and redistributing the airflow, promoting microscale shearing, diffusion, and convection, achieving dual optimization of mixing efficiency and uniformity, and solving the shortcomings of existing mixing devices such as long mixing time and "insufficient micro-mixing".

[0018] 3. This invention is equipped with a thermocouple guide tube, which guides the thermocouple to monitor the temperature of the mixed gas in the reaction zone in real time. Combined with a controllable heat source surrounding the preheating and reaction zones, precise temperature control of the reaction is achieved. Simultaneously, core components such as the shell, gas inlet inner tube, and mixer are made of quartz / ceramic materials resistant to high-temperature environments. This not only easily handles most high-temperature catalytic reactions (such as methane reforming, ammonia decomposition, and various high-temperature oxidation reactions), but also avoids the catalytic side reactions or corrosion problems that may occur with metallic materials, ensuring gas purity and the accuracy of reaction results. Furthermore, the gas inlet inner tube extends directly to the mixing zone, allowing independent heating of the raw gas through the preheating zone. This also mitigates the shortcomings of direct heating of the mixed gas, which easily leads to side reactions, and avoids localized overheating or overcooling that may occur due to the mixing of hot and cold gases, as well as side reactions and catalyst deactivation caused by temperature fluctuations. Furthermore, by using the variable diameter structure of the internal tube (such as the constant diameter section to ensure stable airflow and the second variable diameter section to reduce local resistance), the overall pressure loss is further reduced to reduce energy consumption. It also avoids the impact of pressure fluctuations on the stability of subsequent catalytic reactions, thus solving the defects of "high pressure loss and high energy consumption" in most mixing devices.

[0019] 4. This invention replaces the existing MFC control with a combination of "gas flow meter + multi-distribution plate for precise gas distribution," while employing a mature temperature control system and pressure monitoring logic. It eliminates the need for complex valve control components in pressure distribution devices, significantly reducing the cost of core components and balancing mixing accuracy and economy. Furthermore, modular design (such as compression fittings between the gas inlet pipe and the gas supply source, and sliding thermocouple installation) simplifies the operation process, eliminating the need for complex parameter adjustments by professional personnel and solving the problem of "high operator requirements" in dynamic mixing devices. Additionally, gas inlet pipes of varying radii are spaced on the housing (e.g., the radius of the first gas inlet pipe is four times larger than the others), and some inlet pipes have replaceable filling columns inside the inner gas inlet tube to adjust the flow area. This allows for adaptation to different flow rates and gas composition mixing needs by replacing the corresponding filling columns. Compared to the shortcomings of traditional static mixing devices that "only support single concentration output" and whose special mixing chamber structure is "highly affected by airflow velocity / gas type," this invention significantly enhances adaptability.

[0020] 5. This invention achieves breakthroughs through two major design features: first, an adjustable gas flow path, where the filling column inside the gas inlet pipe can be replaced according to gas flow requirements, thus changing the flow area; second, multi-channel gas distribution capability, with at least two gas inlet pipes on the casing to support the simultaneous introduction of multiple component gases. Combined with the multi-segment distribution plate of the mixer, even with complex compositions (such as those containing inert or reactive gases), uniform mixing can be achieved. This allows it to cover the needs of various scenarios in multiple fields, including chemical engineering (gas-solid catalytic reactions), environmental protection (gas treatment), and energy (fuel gas mixing), overcoming the shortcomings of existing devices that are "inflexible and difficult to adapt to diverse reactions."

[0021] In summary, this invention, through innovative designs such as multi-stage variable diameter structure, porous distribution plate, and U-shaped air inlet pipeline, significantly outperforms existing technologies in terms of mixing efficiency, uniformity, pressure loss, adaptability, and stability. It is particularly suitable for demanding scenarios involving multi-component gas mixing, such as chemical catalysis, energy conversion, and environmental treatment, and combines economy and reliability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the efficient and stable gas mixing device of the present invention (only one gas inlet is shown). Figure 2 This is a schematic diagram of the gas inlet inner pipe structure of the present invention; Figure 3 This is an enlarged view of the mixer of the present invention; Figure 4 for Figure 3 AA section view; Figure 5 for Figure 3 BB cross-sectional view; Figure 6 for Figure 3 CC section view; Figure 7 for Figure 3 DD sectional view; Figure 8 for Figure 3 EE sectional view; Figure 9 for Figure 3 FF sectional view; Figure 10 This is a schematic diagram of the three-dimensional structure of the mixer; In the diagram, 1-shell, 11-preheating zone, 12-mixing zone, 13-reaction zone, 2-gas inlet pipe, 21-outer gas inlet pipe, 22-inner gas inlet pipe, 23-inlet, 24-filling column, 25-outlet, 3-mixed gas outlet pipe, 4-mixer, 41-internal pipe, 411-first diameter changing section, 412-constant diameter section, 413-second diameter changing section, 42-gas distribution plate, 421-first distribution plate. 422-Second distribution plate, 423-Third distribution plate, 424-Fourth distribution plate, 425-Fifth distribution plate, 426-Sixth distribution plate, 427-First hole, 428-Second hole, 429-Third hole, 42A-Fourth hole, 42B-Fifth hole, 42C-Fan-shaped opening, 42D-Baffle, 5-Thermocouple guide tube, 6-Upper fixed frame, 7-Lower fixed frame, 8-Gas flow meter, 9-Upper connecting structure. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0024] like Figures 1 to 10 As shown, the efficient and stable gas mixing device of the present invention includes a housing 1, a gas inlet pipe 2, a mixed gas outlet pipe 3, a mixer 4, and a thermocouple guide pipe 5. The shell 1 is a vertically arranged cylinder with open top and bottom. The upper and lower ends of the shell 1 are open, and the upper part slides through the upper fixing frame 6 and is sealed and fixedly connected to the upper connecting structure 9 above the upper fixing frame 6. The lower part is detachably sealed and fixedly connected to the lower fixing frame 7. The shell 1 is divided into a preheating zone 11, a mixing zone 12, and a reaction zone 13 from top to bottom. The preheating zone 11 and the mixing zone 12 are surrounded by a controllable heat source. At least two gas inlet pipes 2 are arranged at intervals inside the shell 1, which are respectively connected to the external gas source. The mixer 4 is disposed in the mixing zone 12 of the housing 1. The mixer 4 includes an internal tube 41 and a gas distribution plate 42. The upper end and the lower end of the internal tube 41 are respectively sealed to the inner wall of the mixing zone 12. Multiple gas distribution plates 42 for guiding airflow distribution are arranged sequentially from top to bottom at both ends and inside the internal tube 41. The thermocouple guide tube 5 passes through the upper fixing frame 6, the preheating zone 11 and the mixer 4 from top to bottom. A thermocouple for monitoring the temperature of the mixed gas is installed inside the thermocouple guide tube 5. The gas inlet pipe 2 passes through the upper fixed frame 6 and the preheating zone 11 from top to bottom and extends into the mixer 4. One end of the gas inlet pipe 2 outside the housing 1 is connected to the corresponding gas supply source through the gas flow meter 8. One end of the mixed gas outlet pipe 3 passes through the lower fixed frame 7 and extends into the reaction zone 13, while the other end is connected to the analytical instrument.

[0025] The internal tube 41 includes a first variable diameter section 411, a constant diameter section 412, and a second variable diameter section 413. The first variable diameter section 411, the constant diameter section 412, and the second variable diameter section 413 are concentric cylindrical bodies with different diameters that are sealed and connected sequentially from top to bottom. The first variable diameter section 411 is a hollow structure with an inverted frustum and its large diameter end is sealed and connected to the inner wall of the mixing zone 12. The constant diameter section 412 is a straight cylindrical body and its top end is sealed and connected to the small diameter end of the first variable diameter section 411. The second variable diameter section 413 is a symmetrical hourglass structure with the pipe diameter first contracting and then expanding along the central axis and the middle diameter being significantly smaller than the diameters of the two end ports. The upper inlet of the second variable diameter section 413 has the same pipe diameter as the constant diameter section 412 and is sealed and connected. The lower end of the second variable diameter section 413 is sealed and connected to the inner wall of the mixing zone 12.

[0026] It should be noted that the structure of the first variable diameter section 411 of the present invention and its sealed connection with the inner wall of the mixing zone 12 can make the space gradually decrease smoothly, thereby reducing the risk of dead zones in the flow field and reducing flow resistance. The necking design in the middle of the second variable diameter section 413 of the symmetrical hourglass structure can significantly increase the gas flow rate. At the same time, the pressure energy is balanced by utilizing Bernoulli's principle, which further enhances the mixing efficiency of the gas to be mixed under the drive of the high-speed airflow in the narrow section. In addition, the smooth variable diameter of the hourglass structure can minimize turbulence and energy loss during gas flow, and guide the mixed gas to flow in and out smoothly, so that the gas to be mixed can diffuse smoothly and quickly into the reaction zone 13 of the shell 1 after being mixed in the second variable diameter section 413.

[0027] The gas distribution plate 42 includes a first distribution plate 421, a second distribution plate 422, a third distribution plate 423, a fourth distribution plate 424, a fifth distribution plate 425, and a sixth distribution plate 426 arranged in parallel from top to bottom. The thermocouple guide tube 5 passes through the first distribution plate 421, the second distribution plate 422, the third distribution plate 423, the fourth distribution plate 424, the fifth distribution plate 425, and the sixth distribution plate 426 in sequence. like Figure 4 As shown, the first distribution plate 421 is disposed at the top of the first variable diameter section 411 and has a first hole 427 corresponding to the gas inlet pipe 2. The lower part of the gas inlet pipe 2 passes through the first hole 427 and has an outlet hole 25 in the first variable diameter section 411. The second distribution plate 422 is disposed at the bottom end of the first diameter-changing section 411 and has 1 to 4 second holes 428 (e.g. Figure 5 As shown), the third distribution plate 423, the fourth distribution plate 424, and the fifth distribution plate 425 are arranged sequentially from top to bottom within the equal diameter section 412. The third distribution plate 423 has a third hole 429 (as shown). Figure 6 As shown), the fourth distribution plate 424 has multiple fourth holes 42A that are evenly distributed and inclined around the central axis of the housing 1 (as shown). Figure 7 As shown), the fifth distribution plate 425 has multiple fifth holes 42B that are evenly distributed and inclined around the central axis of the housing 1 (as shown). Figure 8 As shown), the sixth distribution plate 426 is disposed at the top of the second variable diameter section 413, and the sixth distribution plate 426 has a plurality of fan-shaped openings 42C evenly distributed around the central axis of the housing 1 (as shown). Figure 9 (As shown).

[0028] The second holes 428 on the second distribution plate 422 have the same diameter, and the included angle between the two farthest second holes 428 is an acute angle.

[0029] A baffle 42D is also provided between the second distribution plate 422 and the third distribution plate 423 on one side of the central axis of the housing 1 (e.g. Figure 6 As shown), the upper end, lower end, and outer side of the baffle 42D are respectively sealed to the bottom end of the second distribution plate 422, the top end of the third distribution plate 423, and the inner wall of the equal-diameter section 412. The second hole 428 on the second distribution plate 422 is located on the side near the baffle 42D, and the third hole 429 on the third distribution plate 423 is located on the other side near the baffle 42D (e.g., Figure 6 As shown in the figure, the angle between the third hole 429 and the second hole 428, which is furthest from the baffle 42D, does not exceed 180°.

[0030] The first included angle between the central axis of the fourth hole 42A and the central axis of the housing 1 is an acute or obtuse angle. The second included angle between the central axis of the fifth hole 42B and the central axis of the housing 1 is an acute or obtuse angle. The sum of the included angles between the fourth hole 42A and the corresponding fifth hole 42B is an obtuse angle. The axial projections of the outlet of the fourth hole 42A on the fourth distribution plate 424 and the inlet of the corresponding fifth hole 42B on the fifth distribution plate 425 are staggered.

[0031] The thermocouple guide tube 5 and the internal tube 41 are both coaxial with the shell 1. The thermocouple is slidably disposed inside the thermocouple guide tube 5 and the temperature measuring point of the thermocouple is located above the solid catalyst in the reaction zone 13.

[0032] The gas inlet pipe 2 includes a gas inlet outer pipe 21 and a gas inlet inner pipe 22. An air inlet 23 is provided on the upper connecting structure 9. One end of the gas inlet outer pipe 21 is connected to the corresponding gas supply source through a gas flow meter 8, and the other end is detachably and sealed to the air inlet 23. The gas inlet inner pipe 22 is located in the preheating zone 11, and its lower part penetrates the first distribution plate 421 and its top part is connected to the air inlet 23.

[0033] At least one first gas inlet pipe with a radius greater than 4 times the radius of the other gas inlet pipes 2 is provided on the housing 1 at intervals. The gas inlet inner pipe 22 corresponding to the gas inlet pipes 2 other than the first gas inlet pipes on the housing 1 is provided with a filling column 24 that can increase the gas flow rate. The length of the filling column 24 is 1 to 5 cm shorter than the length of the gas inlet inner pipe 22.

[0034] It should be noted that this invention incorporates a filling column 24 within the lower-flow-rate gas inlet pipe 22. By reducing the flow cross-sectional area, this increases the gas outflow velocity, enhancing its penetrability and preventing it from being "submerged" by the main gas flow. Meanwhile, a dedicated inlet pipe with a larger diameter is provided for bulk gases to meet their high-flow-rate requirements. This structural design allows for flexible handling of various complex gas mixing schemes. Whether it's inert gases and reactive gases with flow rates differing by several orders of magnitude, or precise proportioning of multiple components, it achieves excellent mixing, demonstrating adaptability far exceeding that of traditional venturi tubes or proportional valves.

[0035] All components of the housing 1, gas inlet inner pipe 22, thermocouple guide pipe 5, filling column 24 and mixer 4 are made of quartz and / or ceramic materials and are designed for a temperature greater than 1000℃.

[0036] The bottom of the gas inlet inner tube 22 is sealed. The upper end of the gas inlet inner tube 22 is connected to the air inlet 23 and a sealing gasket is provided between the gas inlet inner tube 22 and the air inlet 23. The lower end of the gas inlet inner tube 22 extends between the first distribution plate 421 and the second distribution plate 422. Multiple air outlet holes 25 are opened on the outer tube wall of the gas inlet inner tube 22 between the first distribution plate 421 and the second distribution plate 422 at a distance of 3-4 mm from the bottom end.

[0037] The gas inlet inner pipe 22 has two circular air outlets 25 on its outer pipe wall between the first distribution plate 421 and the second distribution plate 422, arranged vertically as one group, for a total of two groups of circular air outlets 25. The circular air outlets 25 are also arranged in a matrix at equal intervals along the outer periphery of the gas inlet inner pipe 22. The multiple smaller circular air outlets 25 facilitate the rapid diffusion of the gas to be mixed from the gas inlet inner pipe 22 into the mixer 4.

[0038] Both the upper fixing frame 6 and the lower fixing frame 7 are made of stainless steel, and the sealing gasket is made of fluororubber.

[0039] Example

[0040] like Figures 1 to 10 As shown, firstly, the gas to be mixed is sent into the preheating zone 11 and mixing zone 12 of the shell 1 by the pressure of the gas inlet pipe 2. The gas in the preheating zone 11 and mixing zone 12 is heated by the controllable heat source surrounding the outside. After the gas in the preheating zone 11 is preheated, it enters the mixing zone 12. While continuing to be heated, it is repeatedly mixed 6 times by the mixer 4 to form a uniform mixed gas. Then the mixed gas enters the reaction zone 13 of the shell 1 and comes into contact with the solid catalyst in the reaction zone 13 to undergo a gas-solid phase catalytic reaction. The mixed gas that has not undergone a gas-solid phase catalytic reaction and the mixed gas that has undergone a gas-solid phase catalytic reaction are sent to the analysis system through the mixed gas outlet pipe 3 for real-time monitoring and concentration analysis, so as to achieve efficient evaluation of catalyst performance.

[0041] In this embodiment, six gas inlet pipes 2 are provided: The first gas inlet pipeline has a radius (R) that is at least 4 times the radius (r) of the other gas inlet pipelines 2 and is fixed as the main pipeline. For some gas components with low corrosivity and low adsorption (such as carbon dioxide, hydrocarbons, etc.), they can be sent into the mixer 4 together with the large flow of carrier gas through the first gas inlet pipeline. The second gas inlet pipeline allows oxygen or auxiliary carrier gas to be fed into the mixer 4. The third gas inlet pipeline allows carbon monoxide or auxiliary carrier gas to be fed into the mixer 4. The fourth gas inlet pipe allows water vapor or auxiliary carrier gas to be fed into the mixer 4. The fifth gas inlet pipeline allows nitric oxide or auxiliary carrier gas to be fed into the mixer 4. The sixth gas inlet pipeline allows ammonia or auxiliary carrier gas to be fed into mixer 4. Furthermore, filling columns 24, which are slightly shorter than the length of the gas inlet inner pipe 22, are respectively installed in the second to sixth gas inlet pipes to reduce the gas flow area and increase the gas flow rate.

[0042] In this embodiment, the first distribution plate 421 has six first holes 427 evenly distributed around the central axis of the housing 1; the second distribution plate 422 has three second holes 428 arranged at equal intervals around the central axis of the housing 1, and the included angle between the first and third second holes 428 is an acute angle; the third distribution plate 423 has one third hole 429, and the second holes 428 on the second distribution plate 422 and the third hole 429 on the third distribution plate 423 are respectively located on both sides of the baffle 42D; the fourth The distribution plate 424 has six fourth holes 42A of the same diameter that are evenly distributed around the central axis of the shell 1 and are inclined; the fifth distribution plate 425 has six fifth holes 42B of the same diameter that are evenly distributed around the central axis of the shell 1 and are inclined. The outlet of the fourth hole 42A on the fourth distribution plate 424 and the inlet of the corresponding fifth hole 42B on the fifth distribution plate 425 are staggered in axial projection; the sixth distribution plate 426 has six fan-shaped openings 42C that are evenly distributed around the central axis of the shell 1 and are symmetrical to each other.

[0043] Gas enters the mixer 4 through two sets of four circular outlet holes 25 at the bottom of the gas inlet pipe 22. While continuing to be heated, it rapidly diffuses into the first diameter-changing section 411 for the first mixing. Then, the gas to be mixed passes through the second hole 428 of the second distribution plate 422 and undergoes a second turbulent mixing between the second distribution plate 422 and the third distribution plate 423. Next, the gas to be mixed passes through the third hole 429 and the fourth hole 42A in sequence, and undergoes a third and fourth mixing between the third distribution plate 423 and the fourth distribution plate 424, and between the fourth distribution plate 424 and the fifth distribution plate 425, respectively. Subsequently, the gas to be mixed passes through the fifth hole 42B and undergoes a fifth mixing between the fifth distribution plate 425 and the sixth distribution plate 426. Finally, the gas to be mixed passes through the fan-shaped opening 42C and undergoes a sixth mixing in the second diameter-changing section 413, and then diffuses smoothly and rapidly into the reaction zone 13 of the shell 1. Through the above six repeated mixing processes, a uniform mixed gas is formed, which comes into contact with the solid catalyst in reaction zone 13 to undergo a gas-solid phase catalytic reaction.

[0044] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A highly efficient and stable gas mixing device, characterized in that: It includes a housing (1), a gas inlet pipe (2), a mixed gas outlet pipe (3), a mixer (4), and a thermocouple guide pipe (5). The shell (1) is a vertically arranged cylinder with open top and bottom. The upper and lower ends of the shell (1) are open, and the upper part slides through the upper fixed frame (6) and is sealed and fixedly connected to the upper connecting structure (9) above the upper fixed frame (6). The lower end is detachably sealed and fixedly connected to the lower fixed frame (7). The shell (1) is divided into a preheating zone (11), a mixing zone (12), and a reaction zone (13) from top to bottom. The preheating zone (11) and the mixing zone (12) are surrounded by a controllable heat source. At least two gas inlet pipes (2) are arranged at intervals inside the shell (1) and are respectively connected to the external gas source. The mixer (4) is disposed in the mixing zone (12) of the housing (1). The mixer (4) includes an internal tube (41) and a gas distribution plate (42). The upper end and the lower end of the internal tube (41) are respectively sealed to the inner wall of the mixing zone (12). Multiple gas distribution plates (42) for guiding airflow distribution are arranged sequentially from top to bottom at both ends and inside the internal tube (41). The thermocouple guide tube (5) passes through the upper fixed frame (6), the preheating zone (11) and the mixer (4) from top to bottom. A thermocouple for monitoring the temperature of the mixed gas is installed inside the thermocouple guide tube (5). The gas inlet pipe (2) passes through the upper fixed frame (6) and the preheating zone (11) from top to bottom and extends into the mixer (4). One end of the gas inlet pipe (2) outside the housing (1) is connected to the corresponding gas supply source through a gas flow meter (8). One end of the mixed gas outlet pipe (3) passes through the lower fixed frame (7) and extends into the reaction zone (13), while the other end is connected to the analytical instrument.

2. The efficient and stable gas mixing device according to claim 1, characterized in that: The internal tube (41) includes a first variable diameter section (411), a constant diameter section (412), and a second variable diameter section (413). The first variable diameter section (411), the constant diameter section (412), and the second variable diameter section (413) are concentric cylindrical bodies with different diameters that are sealed and connected sequentially from top to bottom. The first variable diameter section (411) is a hollow structure with an inverted frustum and its large diameter end is sealed and connected to the inner wall of the mixing zone (12). The constant diameter section (412) is a straight cylindrical body and its top end is sealed and connected to the small diameter end of the first variable diameter section (411). The second variable diameter section (413) is a symmetrical hourglass structure with the pipe diameter first shrinking and then expanding along the central axis and the middle diameter being significantly smaller than the diameters of the two end ports. The upper inlet of the second variable diameter section (413) has the same pipe diameter as the constant diameter section (412) and is sealed and connected. The lower end of the second variable diameter section (413) is sealed and connected to the inner wall of the mixing zone (12).

3. The efficient and stable gas mixing device according to claim 2, characterized in that: The gas distribution plate (42) includes a first distribution plate (421), a second distribution plate (422), a third distribution plate (423), a fourth distribution plate (424), a fifth distribution plate (425), and a sixth distribution plate (426) arranged in parallel from top to bottom. The thermocouple guide tube (5) passes through the first distribution plate (421), the second distribution plate (422), the third distribution plate (423), the fourth distribution plate (424), the fifth distribution plate (425), and the sixth distribution plate (426) in sequence. The first distribution plate (421) is located at the top of the first variable diameter section (411) and has a first hole (427) corresponding to the gas inlet pipe (2). The lower part of the gas inlet pipe (2) passes through the first hole (427) and has an outlet hole (25) in the first variable diameter section (411). The second distribution plate (422) is located at the bottom of the first variable diameter section (411) and has 1 to 4 second holes (428). The third distribution plate (423), the fourth distribution plate (424) and the fifth distribution plate (425) are arranged sequentially from top to bottom in the equal diameter section (412). The third distribution plate (423) has one third hole (429). The fourth distribution plate (424) has multiple fourth holes (42A) that are evenly distributed and inclined around the central axis of the shell (1). The fifth distribution plate (425) has multiple fifth holes (42B) that are evenly distributed and inclined around the central axis of the shell (1). The sixth distribution plate (426) is located at the top of the second variable diameter section (413). The sixth distribution plate (426) has multiple fan-shaped openings (42C) that are evenly distributed around the central axis of the shell (1).

4. The efficient and stable gas mixing device according to claim 3, characterized in that: A baffle (42D) is provided between the second distribution plate (422) and the third distribution plate (423) on one side of the central axis of the housing (1). The upper end, lower end and outer side of the baffle (42D) are respectively sealed to the bottom end of the second distribution plate (422), the top end of the third distribution plate (423) and the inner wall of the equal diameter section (412). The second hole (428) on the second distribution plate (422) is located on the side close to the baffle (42D), and the third hole (429) on the third distribution plate (423) is located on the other side close to the baffle (42D). The included angle between the third hole (429) and the second hole (428) farthest from the baffle (42D) does not exceed 180°.

5. The efficient and stable gas mixing device according to claim 3, characterized in that: The first included angle between the central axis of the fourth hole (42A) and the central axis of the shell (1) is an acute or obtuse angle, the second included angle between the central axis of the fifth hole (42B) and the central axis of the shell (1) is an acute or obtuse angle, the sum of the included angles between the fourth hole (42A) and the corresponding fifth hole (42B) is an obtuse angle, and the axial projections of the outlet of the fourth hole (42A) on the fourth distribution plate (424) and the inlet of the corresponding fifth hole (42B) on the fifth distribution plate (425) are staggered.

6. The efficient and stable gas mixing device according to claim 3, characterized in that: The thermocouple guide tube (5) and the inner tube (41) are coaxial with the shell (1). The thermocouple is slidably disposed in the thermocouple guide tube (5) and the temperature measuring point of the thermocouple is disposed above the solid catalyst in the reaction zone (13).

7. The efficient and stable gas mixing device according to claim 3, 4, 5 or 6, characterized in that: The gas inlet pipe (2) includes a gas inlet outer pipe (21) and a gas inlet inner pipe (22). An air inlet (23) is provided on the upper connecting structure (9). One end of the gas inlet outer pipe (21) is connected to the corresponding gas supply source through a gas flow meter (8), and the other end is detachably sealed to the air inlet (23). The gas inlet inner pipe (22) is located in the preheating zone (11) and its lower part penetrates through the first distribution plate (421), and its top end is connected to the air inlet (23).

8. The efficient and stable gas mixing device according to claim 7, characterized in that: At least one first gas inlet pipe with a radius greater than 4 times the radius of the other gas inlet pipes (2) is provided at intervals on the housing (1). A filling column (24) is provided inside the gas inlet inner pipe (22) corresponding to the gas inlet pipe (2) other than the first gas inlet pipe on the housing (1). The length of the filling column (24) is 1 to 5 cm shorter than the length of the gas inlet inner pipe (22) in which it is located.

9. The efficient and stable gas mixing device according to claim 8, characterized in that: The components of the housing (1), gas inlet pipe (22), thermocouple guide pipe (5), filling column (24) and mixer (4) are all made of quartz and / or ceramic materials and designed for a temperature greater than 1000℃.

10. The efficient and stable gas mixing device according to claim 7, characterized in that: The bottom of the gas inlet inner tube (22) is sealed. The upper end of the gas inlet inner tube (22) is connected to the air inlet (23) and a sealing gasket is provided between the gas inlet inner tube (23). The lower end of the gas inlet inner tube (22) extends to the space between the first distribution plate (421) and the second distribution plate (422). Multiple air outlet holes (25) are provided on the outer tube wall between the first distribution plate (421) and the second distribution plate (422) at a distance of 3-4 mm from the bottom end.

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