Static mixer of gas impingement type mixing structure

Abstract

The utility model discloses a static mixer of gas impact type mixing structure, include: mixer cylinder, two coaxial and opposite setting import part, the import part includes gas 1 import and gas 2 import, gas 1 import with gas 2 import all built -in rafal nozzle, export part, the export part includes gas 3 export, the cyclone mixing part is set in the impact area downstream of the mixer cylinder inside. The utility model solves the problem that the traditional static mixer is mixed to high pressure multicomponent gas and has long mixing time, the problem of insufficient uniformity, the structure easy failure under high pressure working condition and high energy consumption.

Description

Technical Field

[0001] This utility model relates to a static mixer, specifically a static mixer with a gas impact mixing structure. Background Technology

[0002] In industrial fields such as gas mixing and chemical gas blending, the uniformity of gas mixing directly affects key indicators such as subsequent combustion efficiency and reaction conversion rate. Traditional static mixers mostly use structures such as helical blades and perforated plates, relying on the shearing and diffusion of fluids during flow to achieve mixing. However, for the rapid and efficient mixing of multi-component high-pressure gases, there are problems such as long mixing time, high energy consumption, and easy structural failure under high-pressure conditions.

[0003] Especially in scenarios such as fuel blending for gas turbines and gas proportioning for industrial furnaces, the pressure and flow velocity differences of different gas components are significant. Traditional mixing structures struggle to achieve sufficient turbulence development in a short time, resulting in insufficient mixing uniformity, which in turn affects combustion stability and increases pollutant emissions. Furthermore, some mixers, due to unreasonable structural design, are prone to component wear and leakage under high-pressure gas impact, leading to high maintenance costs and safety hazards. Summary of the Invention

[0004] To address this issue, this invention provides a static mixer with a gas impact mixing structure, which solves the problems of long mixing time, insufficient uniformity, easy structural failure under high pressure conditions, and high energy consumption in traditional static mixers for mixing high-pressure multi-component gas.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a static mixer with a gas impact mixing structure, comprising: Mixer cylinder; Two coaxial and oppositely arranged inlet components, the inlet components including gas inlet 1 and gas inlet 2, both of which have built-in Laval nozzles; An outlet component, the outlet component including a gas outlet 3; A swirling mixing component is located downstream of the impact zone inside the mixer cylinder.

[0006] As a preferred embodiment of the static mixer with a gas impact mixing structure, the flow channels of the two inlet components are symmetrically opposed, and the flow channel axis of the inlet components is aligned with the Laval nozzle to guide the gas to be ejected toward the impact zone and collide head-on.

[0007] As a preferred embodiment of the static mixer with a gas impact mixing structure, the impact zone is a common area that the flow channels corresponding to the two inlet components point to together. The impact zone causes the two gas jets from gas inlet 1 and gas inlet 2 to dissipate kinetic energy and generate turbulence after they collide.

[0008] As a preferred embodiment of a static mixer with a gas impact mixing structure, the swirling mixing component is used to receive the mixed gas after impact and to divide and accelerate the mixed gas.

[0009] As a preferred embodiment of a static mixer with a gas impingement mixing structure, the outlet component includes an outlet flange and an outlet transition head. The outlet component is connected to one end of the mixer cylinder, and the other end of the mixer cylinder is provided with a cap.

[0010] As a preferred embodiment of a static mixer with a gas impact mixing structure, the mixer cylinder, the inlet component, the outlet component, and the swirling mixing component are all rigid structures without moving parts.

[0011] As a preferred embodiment of a static mixer with a gas impingement mixing structure, the swirling mixing component is at least one set of mesh-like structures, and multiple sets of the swirling mixing components are cascaded along the axial direction of the mixer cylinder.

[0012] The beneficial effects of this utility model are as follows: First, by accelerating the gas through the built-in Laval nozzle of the imported component, combined with the turbulence generated by the frontal collision in the impact zone, and with the segmentation and acceleration of the swirling mixing component, uniform mixing of the gas at the microscale can be achieved quickly, solving the problems of slow mixing and insufficient uniformity of traditional mixers.

[0013] Secondly, it does not rely on a long flow path and can complete efficient mixing within a short equipment length, making it suitable for installation scenarios with limited space. At the same time, its rigid structure design without moving parts makes it resistant to high pressure and wear, making it suitable for harsh industrial conditions.

[0014] Third, the optimized flow channel design controls fluid pressure drop while ensuring high-intensity mixing, thus reducing energy consumption; the rigid structure without moving parts reduces component wear, leakage and other failures, significantly reducing maintenance frequency and cost.

[0015] Fourth, it can effectively mix multi-component gas with large differences in density and viscosity or with huge mixing ratios, and performs well in gas mixing scenarios with high Reynolds numbers, meeting diverse needs such as gas turbine fuel blending and industrial furnace gas proportioning. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0018] Figure 1 This is a schematic diagram of a traditional spiral blade static mixer structure provided in the embodiments of this utility model; Figure 2 This is a schematic diagram of the spiral blade structure of a conventional spiral blade static mixer provided in the embodiments of this utility model; Figure 3 This is a schematic diagram of the static mixer structure of the gas impact mixing structure provided in the embodiment of this utility model.

[0019] In the diagram: 1. Mixer cylinder; 2. Inlet component; 3. Laval nozzle; 4. Outlet component; 5. Swirl mixing component; 6. Impact zone. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Common internal structures of static mixers include: Helical blade type: By using alternating left and right helical blades, the fluid is continuously rotated and divided, thus achieving mixing.

[0022] Baffle type: The fluid is continuously divided into multiple thin streams by a series of staggered baffles, and their flow direction is changed so that they mix together.

[0023] Typical spiral blade static mixers, such as Figure 1 As shown, its spiral plate structure is as follows Figure 2As shown, both spiral vane and baffle static mixers involve two gases entering the static mixer in a horizontal flow before mixing. Swirl vanes and baffles continuously rotate and divide the gas flow, thus achieving uniform mixing. However, in reality, using swirl vanes and baffles for mixing elements results in low mixing efficiency, uneven mixing, and a relatively long mixer structure. Uneven gas mixing leads to a series of serious problems: low combustion efficiency, uneven calorific value causing burner instability, and flames that may be too long or too short, resulting in energy waste. Unstable combustion produces large amounts of harmful substances such as carbon monoxide (CO) and nitrogen oxides (NOx), and an excessively long equipment structure is also detrimental to installation and transportation.

[0024] Traditional mixers primarily guide fluids to generate an ordered secondary flow to achieve mixing. The invention of this gas impact static mixer, however, actively and forcibly forces two gas streams to collide at a high speed, face-to-face at a specific point. This invention utilizes direct collision between the two gases before they enter the mixing element, generating turbulent kinetic energy. Under the influence of this turbulent kinetic energy, the two gases collide again, promoting effective mixing. The resulting turbulent gas then enters the mixing component, resulting in more uniform mixing and higher mixing efficiency. The following are the specific details of the embodiments of this invention.

[0025] See Figure 3 This utility model provides a static mixer with a gas impact mixing structure, comprising: a mixer body 1; two coaxial and oppositely arranged inlet components 2, each inlet component 2 including a gas 1 inlet and a gas 2 inlet, both of which have built-in Laval nozzles 3; an outlet component 4, which includes a gas 3 outlet; and a swirling mixing component 5, disposed downstream of the impact zone 6 inside the mixer body 1.

[0026] The mixer cylinder 1 serves as a load-bearing structure, providing installation space and protection for internal components and ensuring overall structural stability. Two coaxial, opposite inlet components 2 can separately introduce the two types of gas to be mixed, avoiding initial airflow interference. The built-in Laval nozzle 3 accelerates the gas using fluid dynamics principles. The gas velocity is increased through the nozzle's contraction section, and further converted from static pressure to dynamic pressure in the expansion section, providing sufficient kinetic energy for subsequent impact mixing. The outlet component 4 is used to centrally discharge the mixed gas, meeting the conveying requirements of subsequent processes. The swirling mixing component 5, located downstream of the impact zone 6, can perform secondary and multiple treatments on the gas after initial impact mixing, compensating for potential mixing unevenness in a single impact and achieving staged, progressive, and efficient mixing.

[0027] In this embodiment, the flow channels of the two inlet components 2 are symmetrically opposed, and the flow channel axis of the inlet component 2 is aligned with the Laval nozzle 3 to guide the gas to be ejected toward the impact zone 6 and collide head-on.

[0028] Specifically, the symmetrically opposed flow channel structure ensures that the two gas streams ejected from the inlet component 2 have the same flow path length and resistance, avoiding differences in airflow velocity caused by flow channel asymmetry. The alignment of the flow channel axis with the Laval nozzle 3 ensures that the gas, after being accelerated by the nozzle, is precisely directed along the preset axis towards the impact zone 6, without deviation or scattering, thus achieving a head-on, direct collision between the two gas streams. This collision method maximizes kinetic energy dissipation efficiency, allowing the two gas streams to fully contact and interact at the moment of impact, laying the foundation for generating high-intensity turbulence and avoiding mixing dead zones or efficiency reduction caused by collision deviation.

[0029] In this embodiment, the impact zone 6 is a common area that the flow channels corresponding to the two inlet components 2 point to. The impact zone 6 causes the two gas jets from the gas inlet 1 and the gas inlet 2 to collide, dissipate kinetic energy, and generate turbulence.

[0030] Specifically, the impact zone 6, serving as the convergence point of the two gas streams, is spatially determined by the direction of the inlet component 2's flow channel, ensuring the precise convergence of the two accelerated gas jets. When the high-speed gas jets collide head-on, their macroscopic kinetic energy dissipates rapidly within a short time, breaking the originally ordered laminar flow and transforming it into disordered turbulent flow. In turbulent conditions, the trajectories of the gas molecules are chaotic and interwoven, greatly increasing the contact area and relative velocity of the two gases, significantly shortening the mixing time, and achieving rapid homogenization from the macroscopic to the mesoscopic scale. This solves the problem of low mixing efficiency in traditional mixers that rely on molecular diffusion.

[0031] In this embodiment, the swirling mixing component 5 is used to receive the mixed gas after impact and to divide and accelerate the mixed gas.

[0032] Specifically, although the mixed gas after the impact has initially formed turbulence, there may still be local concentration unevenness. The swirling mixing component 5 first divides the mixed gas into multiple fine streams through its own structure, such as mesh and blades, breaking the original local concentration gradient. At the same time, the inclined flow channel and guide surface of the swirling mixing component 5 can accelerate the divided fine streams again, so that the fine streams can gain new kinetic energy and generate rotational motion. The rotating fine streams will further entwine and mix with each other during the flow process, pushing the initially mixed gas to a more uniform state, realizing the synergistic effect of impact coarse mixing and swirling fine mixing, and greatly improving the final mixing uniformity.

[0033] In this embodiment, the outlet component 4 includes an outlet flange and an outlet transition head. The outlet component 4 is connected to one end of the mixer cylinder 1, and the other end of the mixer cylinder 1 is provided with a cap.

[0034] Specifically, the outlet flange, as a connecting structure, enables a quick and sealed connection between the mixer and downstream pipelines or equipment, ensuring airtightness during gas transmission and avoiding leakage risks. The outlet transition head adopts a transitional flow channel design, which allows the mixed gas to smoothly transition from the large cross-section of the mixer cylinder 1 to the small cross-section of the downstream pipeline, reducing local resistance loss of the airflow at the outlet and avoiding eddies or pressure fluctuations caused by abrupt changes in cross-section, thus ensuring the stability of gas transmission. The end cap at the other end of the mixer cylinder 1 is used to seal the end of the cylinder, forming a complete internal mixing space to prevent gas leakage from the non-outlet end, while also enhancing the structural strength of the cylinder so that it can withstand the high pressure of the internal gas.

[0035] In this embodiment, the mixer cylinder 1, the inlet component 2, the outlet component 4, and the swirling mixing component 5 are all rigid structures without moving parts.

[0036] Specifically, the design without moving parts can completely eliminate problems such as wear and fatigue failure caused by component movement, significantly extending the service life of the mixer and reducing maintenance needs and costs; the rigid structure is usually made of high-strength materials such as metal alloys, which can withstand the high pressure (especially the gas pressure after acceleration by the Laval nozzle 3) and airflow impact during the gas mixing process, avoiding structural deformation or damage; at the same time, the static structure without moving parts does not require an additional drive device, simplifying the overall structure, reducing energy consumption and failure probability, making it suitable for harsh industrial conditions such as high temperature, high pressure, and corrosiveness.

[0037] In one possible embodiment, the swirl mixing component 5 is at least one set of mesh-like structures, and multiple sets of the swirl mixing components 5 are cascaded along the axial direction of the mixer cylinder 1.

[0038] Specifically, the swirl mixing component 5 with its mesh structure features multiple pores and channels, which can divide the mixed gas into more fine streams, increasing the contact and mixing opportunities between the streams. Moreover, the mesh structure provides relatively uniform resistance to the airflow, preventing localized excessive throttling. Multiple components are cascaded along the cylinder axis, allowing the mixed gas to pass through multiple swirl treatments sequentially. Each component can further divide, accelerate, and mix the gas after the previous treatment. Through multiple treatments and a progressive approach, the uneven concentration in the gas is gradually eliminated. Even for gases that are difficult to mix, the ideal mixing effect can be achieved within a short cylinder length, realizing the design goal of short-range, high-efficiency mixing.

[0039] The working principle of this utility model is as follows: The two streams of gas to be mixed are introduced through two coaxial, opposite inlet components 2. The Laval nozzle 3 built into the inlet component 2 is aligned with the flow channel axis. This design ensures that the gas completes the efficient conversion of static pressure to dynamic pressure in the nozzle contraction-expansion flow channel. After forming a high-speed jet, it can accurately point to the impact zone 6 along the preset trajectory, completely avoiding the problem of airflow missing the collision due to alignment deviation.

[0040] Two high-speed gas jets collide head-on in impact zone 6, instantly dissipating their macroscopic kinetic energy. The previously orderly laminar flow is directly disrupted and transformed into extremely high-intensity turbulence. Unlike traditional mixers that rely on the flow path to naturally generate turbulence, this active impact-generated turbulence method can create intense fluid disturbances in a very short space, providing the power for rapid mixing. The intense turbulence tears and breaks the gas clouds of the two gas jets down to a microscale. This process significantly increases the contact surface area between the two gas jets. Compared to traditional laminar mixing that relies on molecular diffusion, this design achieves rapid homogenization at both the macroscopic and mesoscopic scales through turbulence before molecular diffusion takes effect, resulting in an order-of-magnitude improvement in mixing efficiency.

[0041] The gas, after undergoing initial mixing via the first stage of impact, flows out of impact zone 6 and is divided into multiple fine streams, entering the downstream swirling mixing component 5. Within the swirling mixing component 5, the fine streams are accelerated again, triggering a second stage of impact. They are then further divided and enter the next round of impact mixing. This impact-splitting-re-impact process exponentially increases the mixing uniformity, ultimately enabling the device to achieve a near-ideal mixing state within a much shorter length than traditional mixers. Although the narrow flow channel accelerates the airflow, causing a certain pressure drop, this invention optimizes the channel shape and impact angle to maintain a high-intensity mixing effect while keeping the overall pressure drop within a reasonable range. This adapts to high-pressure gas conditions while avoiding excessive pressure drop that could increase system energy consumption.

[0042] The fully mixed gas flows to the outlet component 4. The outlet transition head smoothly transitions the gas to the downstream pipeline through the transition channel, avoiding pressure fluctuations and eddies caused by abrupt changes in cross-section. The outlet flange achieves a sealed connection between the mixer and the downstream equipment, ensuring stable gas delivery without leakage. The end cap at the other end of the mixer cylinder 1 ensures the integrity and structural strength of the internal mixing space, supporting stable operation under high pressure conditions throughout the process.

[0043] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A static mixer with a gas impingement mixing structure, characterized in that, include: Mixer cylinder (1); Two coaxial and oppositely arranged inlet components (2), the inlet components (2) include gas inlet 1 and gas inlet 2, both of which have built-in Laval nozzles (3). The outlet component (4) includes a gas outlet 3; The swirling mixing component (5) is located downstream of the impact zone (6) inside the mixer cylinder (1).

2. The static mixer with a gas impingement mixing structure according to claim 1, characterized in that, The flow channels of the two inlet components (2) are symmetrically opposed, and the flow channel axis of the inlet component (2) is aligned with the Laval nozzle (3) to guide the gas to be ejected toward the impact zone (6) and collide head-on.

3. The static mixer with a gas impingement mixing structure according to claim 1, characterized in that, The impact zone (6) is the common area that the flow channels of the two inlet components (2) point to together. The impact zone (6) causes the two gas jets from the gas inlet 1 and the gas inlet 2 to collide and dissipate kinetic energy and generate turbulence.

4. The static mixer with a gas impingement mixing structure according to claim 1, characterized in that, The swirling mixing component (5) is used to receive the mixed gas after impact and to divide and accelerate the mixed gas.

5. The static mixer with a gas impingement mixing structure according to claim 1, characterized in that, The outlet component (4) includes an outlet flange and an outlet transition head. The outlet component (4) is connected to one end of the mixer cylinder (1), and the other end of the mixer cylinder (1) is provided with a cap.

6. The static mixer with a gas impingement mixing structure according to claim 1, characterized in that, The mixer cylinder (1), the inlet component (2), the outlet component (4), and the swirling mixing component (5) are all rigid structures without moving parts.

7. The static mixer with a gas impingement mixing structure according to claim 1, characterized in that, The swirling mixing component (5) is at least one set of mesh structure, and multiple sets of the swirling mixing components (5) are cascaded along the axial direction of the mixer cylinder (1).

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