Variable vane angle self-adapting cyclone premixing device and control method

Abstract

The present application relates to the technical field of fluid machinery, and particularly relates to a variable blade angle self-adaptive rotational flow premixing device and a control method, which comprises a shell, an outer air inlet branch pipe being arranged on the shell and being perpendicular to the shell, and a flange interface being arranged at an end of the outer air inlet branch pipe; a central gas assembly comprises a right-angle main air inlet pipe and a rotational flow body arranged on the right-angle main air inlet pipe, and an inner branch pipe of the right-angle main air inlet pipe is fixed concentrically in the shell through a top rod together with the outer air inlet branch pipe. Dynamic adjustment of a blade inclination angle is realized through a spring-blade linkage mechanism: a small inclination angle (15-30 degrees) is maintained at low flow rate, and rotational flow strength is enhanced to maintain mixing effect; the blade automatically increases the inclination angle (maximum 75 degrees) at high flow rate, and flow resistance is significantly reduced. Effect verification: under the same inlet pressure, compared with a fixed-blade rotational flow device, outlet flow rate is increased by 15%-22% (CFD and experimental data), and meanwhile, mixing uniformity under full working conditions is ensured.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and in particular to a variable blade angle adaptive swirling premixing device and control method. Background Technology

[0002] With the continuous growth of energy demand and increasingly stringent environmental protection requirements, efficient and clean combustion technology has become a research hotspot in the field of energy utilization. The variable blade angle adaptive swirl premixing device, as an advanced combustion technology, aims to improve the mixing efficiency of fuel and air, optimize the combustion process, reduce pollutant emissions, and improve energy utilization efficiency.

[0003] The variable blade angle adaptive swirl premixing device mainly consists of a swirl converter, a premixing chamber, a variable blade angle adjustment mechanism, sensors, and a control system. The swirl converter promotes thorough mixing of fuel and air by generating a rotating airflow. The premixing chamber provides a space for the fuel and air to mix fully before entering the combustion chamber. The variable blade angle adjustment mechanism dynamically adjusts the angle of the swirl converter blades according to changes in combustion conditions to adapt to different combustion requirements. The sensors and control system are used to monitor combustion parameters in real time and automatically adjust the variable blade angle to achieve adaptive control.

[0004] Traditional cyclone premixers mostly use a fixed-angle blade structure, which has the following drawbacks:

[0005] 1. Poor adaptability to operating conditions and narrow flow rate adjustment range;

[0006] 2. Mixing uniformity decreases significantly with flow rate fluctuations;

[0007] 3. High pressure loss and low energy efficiency;

[0008] 4. It cannot automatically adapt to changes in the fuel / oxidizer ratio. Summary of the Invention

[0009] The purpose of this invention is to address the aforementioned shortcomings in the prior art by proposing a variable blade angle adaptive swirl premixing device and control method.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] The design includes a variable blade angle adaptive swirl premixing device, comprising a housing, on which an external air intake branch pipe perpendicular to the housing is disposed, and the end of the external air intake branch pipe is provided with a flange interface.

[0012] The central gas assembly includes a right-angle main air inlet pipe and a swirling fluid disposed on the right-angle main air inlet pipe. The inner branch pipe of the right-angle main air inlet pipe and the outer air inlet branch pipe are concentrically fixed in the housing by a push rod.

[0013] The swirling fluid includes several blade assemblies, a central fixing tube, a set screw, and a spring. The central fixing tube is fixed to the right-angle main body air intake pipe by the set screw.

[0014] The blade assembly includes a sleeve perpendicular to the central fixed tube and fin-shaped blades.

[0015] The central fixed tube is provided with shafts of the same number as the fin-shaped blades, and the sleeve is sleeved on the shafts and can rotate around them;

[0016] The fin-shaped blades have holes for connecting and fixing one end of the spring, and the other end of the spring is fixed to the right-angle main air intake pipe.

[0017] In detail, the blade assembly has 4-8 groups distributed on the swirling fluid.

[0018] In detail, the external air intake branch pipe enters the housing tangentially.

[0019] In detail, the right-angle main air intake pipe includes a vertical section and a horizontal section.

[0020] In detail, the opening angle of the fin-shaped blades is between 15 and 75 degrees.

[0021] In detail, the control method is as follows:

[0022] S1. Fluid Input Stage

[0023] The first type of fluid, such as air, enters the casing tangentially through the external air intake branch pipe, forming a swirling flow;

[0024] The second type of fluid, such as fuel gas, is injected from the vertical section of the right-angle main intake pipe and enters the swirling fluid section through the horizontal section.

[0025] S2. Adaptive Adjustment Phase

[0026] Low flow rate conditions: The spring is in its natural state, and the fin-type blades maintain a small tilt angle to reduce flow resistance and ensure smooth fluid flow at low flow rates;

[0027] High flow rate conditions: The fluid impact force increases, driving the blades to rotate around the shaft, compressing the spring, and the blade tilt angle increases adaptively, enhancing the swirling intensity and promoting thorough mixing;

[0028] S3. Mixed Output Stage

[0029] The two fluids are sheared and mixed under the action of swirling flow, and finally a uniformly mixed medium is discharged from the shell outlet.

[0030] The design scheme proposed in this invention has the following beneficial effects during application:

[0031] 1. This solution features adaptive flow adjustment and efficiency improvement:

[0032] The blade tilt angle is dynamically adjusted through a spring-blade linkage mechanism: a small tilt angle (15-30 degrees) is maintained at low flow rates to enhance swirling intensity and maintain mixing effect; at high flow rates, the blades automatically increase the tilt angle (maximum 75 degrees) to significantly reduce flow resistance.

[0033] Performance verification: Under the same inlet pressure, compared with the fixed blade hydrocyclone, the outlet flow rate is increased by 15%~22% (CFD and experimental data), while ensuring the mixing uniformity under all operating conditions;

[0034] 2. As described in point 1, it also features customized design and compatibility with various operating conditions:

[0035] Spring stiffness can be customized according to the characteristics of the medium (viscosity, density, etc.) to optimize the blade response sensitivity; the blade assembly adopts a 4-8 fin-type layout, combined with a tangential air intake design, to form a strong shear swirling flow field;

[0036] Technical advantages: It adapts to different fluid combinations (such as gas-air) and has a wide flow range (from low load to peak load), avoiding the problems of uneven mixing or excessive pressure loss caused by changes in operating conditions in traditional fixed blade systems. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the overall side structure of the present invention;

[0039] Figure 3 This is a front view of the present invention.

[0040] Figure 4 This is a schematic diagram of the internal structure of the present invention from the front.

[0041] Figure 5 This is a top view of the present invention;

[0042] Figure 6 This is a front view of the blade of the present invention;

[0043] Figure 7 This is a schematic diagram of the blade side of the present invention;

[0044] Figure 8 This is a schematic diagram of the blade structure of the present invention.

[0045] In the diagram: 1. Housing; 2. Central gas assembly; 3. Push rod; 11. External intake branch pipe; 12. Flange interface; 21. Right-angle main intake pipe; 22. Swirl flow; 211. Internal branch pipe; 221. Blade assembly; 222. Central fixing pipe; 223. Push screw; 224. Spring; 2211. Sleeve; 2212. Fin-shaped blades; 2221. Shaft. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Example

[0047] Reference Figures 1-8 The variable blade angle adaptive swirl premixing device includes a housing 1, on which an external air intake branch pipe 11 perpendicular to the housing 1 is provided, and a flange interface 12 is provided at the end of the external air intake branch pipe 11.

[0048] The central gas assembly 2 includes a right-angle main air inlet pipe 21 and a swirling fluid 22 disposed on the right-angle main air inlet pipe 21. The inner branch pipe 211 and the outer air inlet branch pipe 11 of the right-angle main air inlet pipe 21 are concentrically fixed in the housing 1 by a top rod 3.

[0049] The swirling fluid 22 includes several blade assemblies 221, a central fixing tube 222, a set screw 223, and a spring 224. The central fixing tube 222 is fixed to the right-angle main body air inlet pipe 21 by the set screw 223.

[0050] The blade assembly 221 includes a sleeve 2211 perpendicular to the central fixing tube 222 and a fin-shaped blade 2212;

[0051] The central fixed tube 222 is provided with the same number of shafts 2221 as the fish fin blades 2212, and the sleeve 2211 is sleeved on the shafts 2221 and can rotate around them;

[0052] The fin-shaped blade 2212 has holes for connecting and fixing one end of the spring 224. The other end of the spring 224 is fixed to the right-angle main air intake pipe 21. The spring 224 adopts a single spring arrangement structure. The stiffness of the spring 224 is customized according to the medium characteristics to ensure the blade response sensitivity.

[0053] It should be further noted that there are 4-8 sets of blade assemblies 221 distributed on the swirling fluid 22.

[0054] It should be further noted that the external air intake branch pipe 11 enters the housing 1 tangentially to cause the first fluid to form a swirling flow.

[0055] It should be further noted that the right-angle main air intake pipe 21 includes a vertical section and a horizontal section. The second type of fluid is injected from the vertical section and enters the swirling fluid 22 through the horizontal section.

[0056] It should be further noted that the opening angle of the fin-type blades 2212 is between 15 and 75 degrees.

[0057] Under low flow conditions, the spring 224 is in its natural state, and the fin-shaped blades 2212 maintain a small tilt angle to enhance the swirl intensity;

[0058] Under high flow conditions, the fluid impact force increases, which drives the fin-shaped blade 2212 to rotate around the shaft 2221, compressing the spring 224 and causing the tilt angle of the fin-shaped blade 2212 to increase adaptively, thereby reducing flow resistance.

[0059] The two fluids are sheared and mixed under the action of swirling flow, and finally a uniformly mixed medium is discharged from the outlet of the shell 1;

[0060] Under the same inlet pressure, compared with a fixed-blade hydrocyclone, the outlet flow rate of this device is increased by about 15%-22%.

[0061] It should be further explained that the control methods are as follows:

[0062] S1. Fluid Input Stage

[0063] The first type of fluid, such as air, enters the housing 1 tangentially through the external air intake branch pipe 11, forming a swirling flow.

[0064] The second type of fluid, such as gas, is injected from the vertical section of the right-angle main intake pipe 21 and enters the swirling fluid 22 through the horizontal section.

[0065] S2. Adaptive Adjustment Phase

[0066] Low flow rate conditions: Spring 224 is in its natural state, and fin-type blades 2212 maintain a small tilt angle to reduce flow resistance and ensure smooth fluid flow under low flow conditions.

[0067] High flow rate conditions: The fluid impact force increases, driving the blade 2212 to rotate around the shaft 2221, compressing the spring 224, and the blade tilt angle increases adaptively, enhancing the swirling intensity and promoting thorough mixing.

[0068] S3. Mixed Output Stage

[0069] The two fluids are sheared and mixed under the action of swirling flow, and finally a uniformly mixed medium is discharged from the outlet of shell 1. Example

[0070] Under the same inlet pressure, compared with a fixed-blade hydrocyclone, the outlet flow rate of this device is increased by about 15%-20% (verified by CFD simulation and experiments).

[0071] Spring stiffness can be customized according to the characteristics of the medium (such as viscosity and density) to ensure blade response sensitivity.

[0072] Working principle: When the inlet flow rate increases, the fluid impact force Ff and the spring preload force Fs achieve dynamic balance: Ff×L1 = Fs×L2 (L1=lever arm length), which drives the blade to rotate around the shaft 2221 to increase the opening and realize the adaptive adjustment of the flow channel cross-sectional area. Example

[0073] 1. The variable blade angle adaptive swirl premixing device can be used to mix two fluids. The variable blade angle adaptive swirl premixing device includes a housing 1, a central gas assembly 2, and a push rod 3. An external air inlet branch pipe 11 perpendicular to the housing 1 is provided on the housing 1, and a flange interface 12 is provided at the end of the external air inlet branch.

[0074] 2. The central gas assembly 2 includes a right-angle main intake pipe 21 and a swirling fluid 22 disposed on the right-angle main intake pipe 21. The inner branch pipe 211 and the outer intake branch pipe 11 of the right-angle main intake pipe 21 are concentrically fixed in the housing 1 by a push rod 3. The swirling fluid 22 includes several blade assemblies 221, a central fixing pipe 222, a push screw 223, and a spring 224. The central fixing pipe 222 can be fixed to the right-angle main intake pipe 21 by the push screw 223. The blade assembly 221 has a structure including a sleeve 2211 perpendicular to the central fixing pipe 222 and a fin-shaped blade 2212.

[0075] 3. The central fixed tube 222 is provided with the same number of shafts 2221 as the fin blades 2212, and the sleeve 2211 is fitted on the shafts 2221 and can rotate;

[0076] 4. The holes provided on the fin-shaped blades 2212 can be used to connect and fix one end of the spring 224, and the other end of the spring 224 is fixed to the right-angle main body air intake pipe 21.

[0077] 5. The purpose of this invention is that the blade angle can be automatically adjusted according to the flow rate of the medium by the spring 224 of the variable blade angle assembly 221. Compared with the traditional fixed angle swirl assembly, the outlet flow rate of the variable blade angle swirl premixer will be larger under the same inlet pressure.

[0078] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A variable vane angle self-adapting swirled premixing device, characterized in that: The shell (1) is provided with an outer intake branch pipe (11) perpendicular to the shell (1), and the end of the outer intake branch pipe (11) is provided with a flange interface (12); The central gas assembly (2) comprises a right-angle main intake pipe (21) and a swirl body (22) arranged on the right-angle main intake pipe (21), and the inner branch pipe (211) of the right-angle main intake pipe (21) is fixed concentrically in the shell (1) through a top rod (3); The swirl body (22) comprises a plurality of blade assemblies (221), a central fixed pipe (222), a top wire (223) and a spring (224), and the central fixed pipe (222) is fixed on the right-angle main intake pipe (21) through the top wire (223); The blade assembly (221) comprises a sleeve (2211) perpendicular to the central fixed pipe (222) and a fish fin-shaped blade (2212); The central fixed pipe (222) is provided with the same number of shaft rods (2221) as the fish fin-shaped blades (2212), and the sleeve (2211) is sleeved on the shaft rod (2221) and can rotate thereon; The fish fin-shaped blade (2212) is provided with a hole for connecting and fixing one end of the spring (224), and the other end of the spring (224) is fixed on the right-angle main intake pipe (21).

2. The variable blade angle adaptive swirl premixing device of claim 1, wherein: The blade assembly (221) is distributed on the swirl body (22) in 4-8 groups.

3. The variable blade angle adaptive swirl premixing device of claim 2, wherein: The outer intake branch pipe (11) enters the shell (1) tangentially.

4. The variable blade angle adaptive swirl premixing device of claim 3, wherein: The right-angle main intake pipe (21) comprises a vertical section and a horizontal section.

5. The variable blade angle adaptive swirl premixing device of claim 4, wherein: The opening and closing angle of the fish fin-shaped blade (2212) is between 15-75 degrees.

6. The control method of the variable blade angle self-adapting pre-mixing device of any one of claims 1-5, characterized in that: The control method is as follows: S1. Fluid input stage The first fluid enters the shell (1) tangentially through the outer intake branch pipe (11) to form a swirl flow; The second fluid is injected from the vertical section of the right-angle main intake pipe (21) and enters the swirl body (22) through the horizontal section; S2. Self-adaptive adjustment stage Low flow condition: the spring (224) is in a natural state, the fish fin-shaped blade (2212) maintains a small inclination angle, reduces the flow resistance, and ensures the smooth passage of the fluid under low flow; High flow condition: the fluid impact force increases, pushes the blade (2212) to rotate around the shaft rod (2221), compresses the spring (224), and the blade inclination angle self-adapts to increase, enhances the swirl intensity, and promotes full mixing; S3. Mixed output stage The two fluids are sheared and mixed under the action of swirl, and finally the uniformly mixed medium is discharged from the outlet of the shell (1).

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