A multi-source gas mixing device

Abstract

The utility model discloses a kind of mixed gas devices of multi-source gas, specifically related to gas mixing field, including tank, the tank bottom is fixedly installed with multiple air inlet pipes, the tank top is installed with air outlet pipe, the tank inside is fixedly installed with the second porous diffusion plate and first porous diffusion plate distributed in up and down, the second porous diffusion plate and first porous diffusion plate divide tank into lower premixing zone, middle fine mixing zone and upper steady pressure homogenization zone.The utility model relates to a kind of mixed gas devices of multi-source gas, first by tangential air intake and helical flow guide vane to establish strong vortex to realize macroscopic blending, then by conical hopper and shear plate to enhance disturbance, again by double porous diffusion plate to generate turbulence efficiently, by the intense collision of manufacturing two high-speed counter-rotating air flow through the core coaxial reverse helical fine mixing component, depth uniform mixing is realized, and mixing uniformity is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of gas mixing, and in particular to a gas mixing device for multiple gas sources. Background Technology

[0002] In industrial plants such as ozone oxidation, the reaction tail gas is typically rich in high concentrations of oxygen. Directly discharging this tail gas not only wastes valuable oxygen resources but also incurs economic losses and environmental burdens. Therefore, recovering the tail gas and reconnecting it to the plant's gas source to construct an oxygen recycling system has become an important technological direction for improving resource utilization and reducing operating costs. In this recycling system, the high-concentration oxygen recovered from the tail gas needs to be thoroughly mixed with supplementary fresh gas (such as air or other process gases) to form a mixed gas source with stable concentration, flow rate, and pressure, which is then supplied to downstream oxygen production or reaction units. The quality of the mixed gas directly affects the processing capacity, operational stability, and efficiency of downstream core equipment; therefore, the design of a high-performance gas mixing device is a key aspect in realizing this technological approach. Utility Model Content

[0003] The main objective of this invention is to provide a gas mixing device for multiple gas sources, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A multi-source gas mixing device includes a tank. Multiple inlet pipes are fixedly installed at the bottom of the tank. The inlet pipes have 3D bends at their connections with the tank, and the bends are oriented strictly in the tangential direction of the gas flowing into the tank. An outlet pipe is installed at the top of the tank. A second porous diffuser plate and a first porous diffuser plate, distributed vertically, are fixedly installed inside the tank. The second porous diffuser plate and the first porous diffuser plate divide the interior of the tank into a lower premixing zone, a middle fine mixing zone, and an upper pressure stabilization and homogenization zone. A fine mixing component is fixedly installed in the fine mixing zone.

[0006] Preferably, a first fixing post is provided at the lower part of the tank body, and a plurality of spiral guide vanes are fixedly installed on the outer surface of the first fixing post. The outer wall of the spiral guide vanes is fixedly connected to the inner wall of the tank body, and the first fixing post is located above the air inlet pipe.

[0007] Preferably, the tangential incident angle of the air inlet pipe entering the tank body is 15°-60°.

[0008] Preferably, a conical funnel is fixedly installed at the bottom of the first porous diffuser plate, and multiple shearing plates are uniformly fixedly installed on the outer surface of the conical funnel. A connecting pipe is fixedly installed at the bottom of the conical funnel, and the connecting pipe is located above the first fixed column.

[0009] Preferably, the first and second porous diffuser plates have multiple through holes distributed in a ring, with an opening rate of 30%-70%.

[0010] Preferably, the fine mixing component includes a cylindrical sleeve and a shaft. The shaft is fixedly installed in the middle between the first porous diffuser plate and the second porous diffuser plate. The cylindrical sleeve is sleeved on the outside of the shaft. Multiple outer helical blades are fixedly installed between the outer surface of the cylindrical sleeve and the inner wall of the tank. Multiple inner helical blades are fixedly installed on the outer surface of the shaft. The outer and inner helical blades rotate in opposite directions.

[0011] Preferably, the helix angle of the inner helical blade is greater than that of the outer helical blade.

[0012] Preferably, a small inverted cone is provided extending upward from the upper port of the connecting pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention discloses a multi-source gas mixing device. First, it establishes a strong swirling flow through tangential air intake and spiral guide vanes to achieve macroscopic mixing. Then, it enhances disturbance through a conical funnel and shear plate, and efficiently generates turbulence through a double porous diffuser plate. Finally, the core coaxial counter-rotating spiral fine mixing component creates a violent collision between two high-speed, counter-rotating airflows, achieving deep and uniform mixing and significantly improving mixing uniformity. The entire mixing process relies entirely on the gas's own kinetic energy and a sophisticated flow channel design, eliminating the need for any moving parts such as motors or stirring shafts, making it more energy-efficient and environmentally friendly. This invention effectively solves the problem of efficient, uniform, and stable mixing of multi-source gases (especially in ozone tail gas recovery scenarios) through specific, simulation-verified structural combinations and parameter ranges, particularly the optimized tangential air intake structure, three-stage mixing zones, counter-rotating spiral fine mixing component, and CFD-based volume and parameter determination methods. Furthermore, its compact structure and easy expansion demonstrate significant practicality and advancement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is a diagram of the fine mixing component of this utility model;

[0018] Figure 4 This is a schematic diagram showing the connection between the conical funnel, shearing plate, and connecting pipe of this utility model;

[0019] Figure 5 This is a schematic diagram of the simulation results of this utility model;

[0020] Figure 6 This is a schematic diagram of the simulation results of the 3D elbow air intake of this utility model;

[0021] Figure 7 This is a schematic diagram of the simulation results of the straight pipe air intake of this utility model.

[0022] In the diagram: 1. Tank body; 2. Inlet pipe; 3. Outlet pipe; 4. First fixed column; 5. Spiral guide vane; 6. Conical funnel; 7. Shear plate; 8. Connecting pipe; 9. Fine mixing component; 10. First porous diffuser plate; 11. Second porous diffuser plate; 91. Cylindrical sleeve; 92. Outer spiral blade; 93. Shaft; 94. Inner spiral blade. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] like Figure 1-7 As shown, a multi-source gas mixing device includes a vertical cylindrical or near-cylindrical tank 1, which constitutes the main chamber for the gas mixing process. Three inlet pipes 2 are evenly distributed along the circumference of the bottom of the tank 1; two are working inlet pipes, used for connecting high-concentration oxygen tail gas and supplementary air, respectively; the third can serve as a reserved or process supplementary gas interface, enabling convenient expansion from two-source to three-source input. All inlet pipes 2 are tangentially connected. An outlet pipe 3 is installed at the center of the top of the tank 1. The interior of the tank 1 is clearly divided into three functional zones by two horizontally mounted perforated plates. This partitioned structure has been verified by simulation to effectively achieve step-by-step mixing: the lower pre-mixing zone extends from the bottom of the tank to the lower surface of the first perforated diffuser plate 10; the middle fine mixing zone is located between the first perforated diffuser plate 10 and the second perforated diffuser plate 11, where the core fine mixing component 9 is installed; and the upper pressure stabilization and homogenization zone extends from the upper surface of the second perforated diffuser plate 11 to the top of the tank.

[0025] Within the premixing zone, the core structure includes a tangential air inlet pipe 2. The angle between its central axis and the tangent of the inner wall of the tank 1 (tangential incident angle α) is optimally set to 30° through simulation (adjustable within the range of 15°-60°). Simultaneously, a 3D elbow is added to the air inlet pipe 2 at its connection with the tank, and the elbow's orientation strictly follows the tangential direction of gas flow into the tank (see...). Figure 6 (Illustrative image). Compare to straight-pipe air intake ( Figure 7This design, verified by CFD simulation, can significantly reduce local resistance, decrease intake pipe pressure loss by approximately 35%, and reduce inlet turbulence intensity, which is beneficial for forming a stable initial vortex. According to GB50030... According to the "Oxygen Station Design Code," the nominal diameter of the inlet pipe 2 and outlet pipe 3 should not be less than DN32, but DN40 is selected in this example. A first fixed column 4 (with a diameter of approximately 0.15D) is installed directly above the inlet of the inlet pipe 2. Three right-handed spiral guide vanes 5 are welded to the outer surface of the column, and their outer edges are welded to the inner wall of the tank. The lead P1 of the spiral guide vanes 5 is approximately 1.0D, thus forming a continuous spiral upward channel with a fixed lead between the fixed column and the tank wall. The first fixed column 4 is located above the inlet pipe 2, so that the rotating airflow flowing in from the tangential inlet pipe 2 can be immediately guided into the spiral channel. Under the forced guidance of the spiral guide vanes 5, the rotational kinetic energy is maintained and enhanced, and gases from different sources achieve preliminary and large-scale mixing in the spiral motion.

[0026] At the bottom center of the first porous diffuser plate 10, an inverted conical funnel 6 is fixedly installed. The large-diameter end of the conical funnel 6 faces upward and is connected to the bottom surface of the first porous diffuser plate 10, while the small-diameter end faces downward. On the outer conical surface of the conical funnel 6, multiple vertical, radial, or angled shearing plates 7 are uniformly fixedly installed. These shearing plates 7 protrude from the conical surface like "ribs" and are used to divide, impact, and shear the cyclone flow rising from the lower spiral channel. At the bottom small-diameter end of the conical funnel 6, a vertical connecting pipe 8 is fixedly installed. The lower opening of the connecting pipe 8 is located above the first fixed column 4 and maintains a certain axial distance from it. Its function is to collect the airflow that has passed through the spiral channel and is initially mixed. The airflow, after impacting the conical funnel 6 and shear plate 7, is further broken and redirected, and then relatively concentrated and directed to the central region of the first porous diffuser plate 10. A small inverted cone is provided at the upper end of the connecting pipe 8. The inverted cone is fixedly installed inside the upper end of the connecting pipe 8 by a cross-shaped support frame. This central inverted cone directly blocks and diverts the core high-speed airflow that is vertically rushing upward from the connecting pipe 8. After the airflow impacts the inverted cone, it is forced to flow around and meet the airflow coming down from the inner wall of the conical funnel, forming a strong collision and flow mixing. This can effectively disperse any possible central high-speed jet and prevent it from directly impacting the central region of the first porous diffuser plate without sufficient mixing, thereby improving the concentration and velocity distribution at the inlet section of the porous plate.

[0027] During operation, multiple streams of gas enter the bottom of the tank at high speed from the tangential inlet pipe 2, forming a rotating airflow. This airflow is immediately captured by the spiral guide vanes 5 above and forced to rise along the spiral channel, completing the initial mixing. Subsequently, the airflow impacts the conical surface of the conical funnel 6 and the shear plate 7, drastically changing the flow direction and converting part of the kinetic energy into turbulent energy, further segmenting and shearing the gas particles. Afterward, the airflow enters the area below the first porous diffuser plate 10 through the connecting pipe 8, passing through numerous small holes on the first porous diffuser plate 10 in a relatively concentrated manner. This porous plate breaks the airflow into a large number of fine jets, greatly increasing the gas contact area and generating strong turbulence. These turbulent jets then enter the area composed of the fine mixing components 9 for deep, counter-current shear mixing. Finally, the mixed gas passes through the second porous diffuser plate 11 for final homogenization and stabilization, and is finally discharged from the top outlet pipe 3.

[0028] The tangential angle of incidence (specifically, the acute angle between the central axis of the air inlet pipe 2 and the circumferential tangent of the inner wall of the tank 1 at the air inlet contact point) of the air inlet pipe 2 into the tank 1 is 15°-60°. Multiple through holes are annularly distributed on the first porous diffuser plate 10 and the second porous diffuser plate 11. The first porous diffuser plate 10 has an opening rate of 50%, with through holes 61 evenly distributed in concentric rings, each with a diameter of 5mm. The second porous diffuser plate 11 has an opening rate of 55%, serving as the final homogenizer and flow stabilizer.

[0029] The fine mixing component 9 includes a cylindrical sleeve 91 and a shaft 93. The shaft 93 is fixedly installed in the middle between the first porous diffuser plate 10 and the second porous diffuser plate 11. The cylindrical sleeve 91 is sleeved on the outside of the shaft 93. Multiple outer spiral blades 92 are fixedly installed between the outer surface of the cylindrical sleeve 91 and the inner wall of the tank 1. Multiple inner spiral blades 94 are fixedly installed on the outer surface of the shaft 93. The outer spiral blades 92 and the inner spiral blades 94 have opposite directions of rotation. The helix angle of the inner spiral blades 94 is greater than that of the outer spiral blades 92. This allows the flow cross-sectional area of ​​the central channel to be typically smaller than that of the annular channel. The larger inner spiral angle helps to reduce the flow resistance of the central channel and increase the axial gas velocity in the channel, thereby improving the flow velocity relative to the flow velocity. The slow annular channel airflow achieves closer axial momentum matching at the component outlet, avoiding simple envelopment or insufficient penetration of one airflow into another. The number of inner helical blades 94 and outer helical blades 92 can be 2 to 6, preferably 3 or 4, to achieve a balance between flow resistance and mixing intensity. Preferably, the outer helical blades 92 are right-handed (clockwise) and the inner helical blades 94 are left-handed (counterclockwise). The helix angle of the outer helical blades 92 can be 15° to 35°, and the helix angle of the inner helical blades 94 can be 5° to 20° larger than that of the outer helical blades, for example, selected in the range of 25° to 50°. A small gap (e.g., 1-5 mm) is maintained between the inner wall of the cylindrical sleeve 91 and the tip of the inner helical blades 94 to ensure structural stability and not affect the core flow field.

[0030] The total volume V of tank 1 is a key parameter for ensuring mixing uniformity. CFD simulations show that, with a fixed diameter, halving the height (i.e., volume) of tank 1 significantly reduces the uniformity of oxygen concentration distribution at the outlet cross-section (a noticeable gradient appears in the distribution cloud map of mass fraction or mole fraction). Therefore, this invention ensures final mixing uniformity through the aforementioned multi-stage structural combination and sufficient residence time (guaranteed by volume V). In this example, volume V ≈ π*(D / 2)²*H, which must meet the minimum residence time requirement derived from the simulation.

[0031] The working principle of this utility model is as follows:

[0032] During operation, multiple gases enter at high speed from the tangential inlet pipe 2 (incident angle 15°-60°) at the bottom of the tank 1, naturally forming a rotating airflow at the bottom of the tank 1. The spiral guide vane 5 above guides and strengthens this rotating flow, so that the airflows from different sources begin to come into initial contact and mix during the rotating motion.

[0033] Then the rotating and rising airflow impacts the inclined surface of the conical funnel 6, forcing it to change direction and spread outwards. During this process, the shear plate 7 set on the outer surface of the conical funnel 6 further cuts and disturbs the airflow, enhancing the mutual shearing and collision between different gas micro-particles, thus completing the first stage of macroscopic mixing.

[0034] After the impact diffusion, the mixed airflow rises through the connecting pipe 8 into the conical funnel 6, and then passes through the first porous diffuser plate 10. The numerous through holes on the plate divide the airflow into a large number of fine jets, destroying the original laminar or large-scale vortex structure, exciting strong micro-turbulence, and making the velocity distribution more uniform, creating ideal conditions for the next stage of fine mixing.

[0035] Then, the uniformly distributed airflow enters the core fine mixing component 9, which consists of coaxial inner helical blades 94 and outer helical blades 92, with opposite rotation directions. The airflow is automatically divided into two parts: one part enters the central channel and is guided by the inner helical blades 94 to rotate and rise; the other part enters the annular channel and is guided by the outer helical blades 92 to rotate and rise in the opposite direction. These two high-speed, counter-rotating airflows meet head-on in the outlet area above the component, generating intense reverse shearing, stretching, and collision, achieving deep and uniform mixing at the molecular scale.

[0036] The finely mixed gas finally passes through the second porous diffuser plate 11, which acts as a final "homogenizer" to eliminate any residual local concentration inconsistencies or large eddies, ensuring a high degree of homogeneity in the output gas. Finally, the uniformly mixed gas is stably discharged from the outlet pipe 3 at the top of the tank 1.

[0037] The design process of this device includes a simulation verification method, the steps of which are: a. establishing a three-dimensional fluid dynamics model of the gas mixing device; b. setting inlet boundary conditions (such as varying oxygen tail gas concentration and flow rate, constant air flow rate); c. performing numerical simulation using CFD software such as ANSYS FLUENT; d. analyzing the output results, focusing on verifying the gas pressure, flow rate, and uniformity of oxygen mass fraction / mole fraction distribution at the outlet section; e. optimizing and adjusting parameters such as tank diameter D, height H, inlet pipe angle α, perforated plate opening ratio, and helical blade helix angle based on the simulation results, until the output gas pressure is stable and the concentration uniformity meets the feeding requirements of the subsequent oxygen generation unit. This method allows for the quantitative prediction and optimization of the gas mixing effect before manufacturing, ensuring design reliability.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gas mixing device for multiple gas sources, comprising a tank (1), characterized in that: The bottom of the tank (1) is fixedly equipped with multiple air inlet pipes (2). The air inlet pipes (2) are provided with 3D elbows at the connection with the tank 1, and the elbows are oriented strictly in the tangential direction of the gas flowing into the tank (1). The top of the tank (1) is equipped with an air outlet pipe (3). The inside of the tank (1) is fixedly equipped with a second porous diffuser plate (11) and a first porous diffuser plate (10) distributed vertically. The second porous diffuser plate (11) and the first porous diffuser plate (10) divide the inside of the tank into a lower premixing zone, a middle fine mixing zone and an upper pressure stabilization and homogenization zone. A fine mixing component (9) is fixedly installed in the fine mixing zone.

2. The gas mixing device for multiple gas sources according to claim 1, characterized in that: The lower part of the tank (1) is provided with a first fixed column (4), and a plurality of spiral guide vanes (5) are fixedly installed on the outer surface of the first fixed column (4). The outer wall of the spiral guide vanes (5) is fixedly connected to the inner wall of the tank (1). The first fixed column (4) is located above the air inlet pipe (2).

3. The gas mixing device for multiple gas sources according to claim 1, characterized in that: The tangential incident angle of the air inlet pipe (2) entering the tank (1) is 15°-60°.

4. The gas mixing device for multiple gas sources according to claim 2, characterized in that: A conical funnel (6) is fixedly installed at the bottom of the first porous diffuser plate (10). Multiple shearing plates (7) are uniformly fixedly installed on the outer surface of the conical funnel (6). A connecting pipe (8) is fixedly installed at the bottom of the conical funnel (6). The connecting pipe (8) is located above the first fixed column (4).

5. A gas mixing device for multiple gas sources according to claim 1, characterized in that: The first porous diffuser plate (10) and the second porous diffuser plate (11) have multiple through holes (61) distributed in a ring, with an opening rate of 30%-70%.

6. The gas mixing device for multiple gas sources according to claim 1, characterized in that: The fine mixing component (9) includes a cylindrical sleeve (91) and a shaft (93). The shaft (93) is fixedly installed in the middle between the first porous diffuser plate (10) and the second porous diffuser plate (11). The cylindrical sleeve (91) is sleeved on the outside of the shaft (93). Multiple outer spiral blades (92) are fixedly installed between the outer surface of the cylindrical sleeve (91) and the inner wall of the tank (1). Multiple inner spiral blades (94) are fixedly installed on the outer surface of the shaft (93). The outer spiral blades (92) and the inner spiral blades (94) have opposite rotation directions.

7. A gas mixing device for multiple gas sources according to claim 6, characterized in that: The helix angle of the inner helical blade (94) is greater than that of the outer helical blade (92).

8. A gas mixing device for multiple gas sources according to claim 4, characterized in that: The upper port of the connecting pipe (8) extends upward to form a small inverted cone.

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