Static mixer jet structure based on Archimedes spiral and working method thereof

Abstract

The invention belongs to the technical field of static mixers, and provides an Archimedes spiral-based static mixer jet structure and a working method thereof, the Archimedes spiral-based static mixer jet structure comprises a shell, and a spiral jet branch pipe and a mixing element arranged in the shell; each spiral injection branch pipe comprises an air inlet pipe, a spiral pipe connected with the air inlet pipe and a plurality of air outlet pipes arranged on the spiral pipe; the spiral pipe is of an Archimedes spiral structure, the air inlet pipe penetrates through the shell, the spiral pipe is located in the shell, and an air outlet of the air outlet pipe faces the mixing element. The multi-path hydrogen nozzles arranged in the Archimedes spiral are combined with the mixing element, so that the hydrogen can be uniformly dispersed and sprayed in a three-dimensional space, the mixing uniformity of the hydrogen and natural gas is effectively improved, the hydrogen is prevented from being enriched along the pipe wall due to density difference or the local concentration is prevented from being too high, and the material degradation and leakage risk caused by hydrogen embrittlement is remarkably reduced.

Description

Technical Field

[0001] This invention belongs to the field of static mixer technology, and particularly relates to a static mixer jet structure based on the Archimedes spiral and its working method. Background Technology

[0002] Against the backdrop of the accelerated global energy structure transition towards low-carbonization, hydrogen energy has become a core energy source due to its zero-carbon emissions, high energy density, and diverse application potential. In particular, natural gas blending technology can utilize existing pipeline networks to transport hydrogen to end users, significantly reducing the barriers and costs of large-scale application and becoming an important path for promoting the commercialization of hydrogen energy. However, the practical promotion of natural gas blending technology still faces many severe challenges. Hydrogen's density is only about 1 / 8 that of natural gas, and its viscosity varies significantly, making it susceptible to buoyancy-induced gas accumulation and stratification during pipeline transport. Especially in low-flow-rate horizontal pipe sections, hydrogen rises rapidly, causing severely uneven concentration distribution across the cross-section. This affects the efficiency and stability of terminal combustion equipment and may also lead to leakage or even explosion risks due to excessively high local hydrogen concentrations. Furthermore, under high pressure, hydrogen exhibits significant hydrogen embrittlement effects on metallic materials.

[0003] Currently used single-pipe hydrogen injection structures have limited mixing efficiency and tend to accumulate hydrogen near the mixer wall and downstream, causing the pipe to be under high hydrogen partial pressure for extended periods. Hydrogen atoms penetrate the steel grain boundaries, leading to a decrease in material toughness and strength, seriously threatening pipeline durability and operational safety. These factors directly restrict the large-scale application and economic feasibility of hydrogen blending technology. Current static mixer injection structures cannot achieve uniform hydrogen dispersion in three-dimensional space, resulting in poor mixing uniformity and causing hydrogen accumulation or locally excessively high concentrations along the pipe wall due to density differences. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a static mixer injection structure and its operating method based on an Archimedean spiral. By combining multiple hydrogen nozzles arranged along an Archimedean spiral with mixing elements, uniform dispersion injection of hydrogen can be achieved in three-dimensional space, effectively improving the mixing uniformity between hydrogen and natural gas. This avoids hydrogen enrichment along the pipe wall due to density differences or excessively high local concentrations, significantly reducing the risk of material degradation and leakage caused by hydrogen embrittlement.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a static mixer jet structure based on an Archimedean spiral, employing the following technical solution: A static mixer jet structure based on an Archimedean spiral includes a housing, a spiral jet branch pipe disposed within the housing, and a mixing element. The spiral injection branch pipe includes an air inlet pipe, a spiral pipe connected to the air inlet pipe, and a plurality of air outlet pipes disposed on the spiral pipe; the spiral pipe is an Archimedean spiral structure. The air inlet pipe passes through the housing, the spiral tube is located inside the housing, and the air outlet of the air outlet pipe faces the mixing element.

[0006] Furthermore, one end of the housing is provided with an air inlet for natural gas to enter, and the other end is provided with an air outlet for hydrogen-blended natural gas to be output; the spiral injection branch pipe is located at the end of the housing near the air inlet.

[0007] Furthermore, the mixing element is disposed within the mixing cavity of the housing; the mixing element includes multiple spiral blades, each spiral blade including a first spiral blade and a second spiral blade connected to each other; the starting points of the spirals in adjacent spiral blades are staggered.

[0008] Furthermore, the first spiral blade and the second spiral blade are respectively a left-handed spiral blade and a right-handed spiral blade, and the spiral directions of adjacent spiral blades are opposite.

[0009] Furthermore, the overall length of the hybrid element is 720 mm, and the length of each spiral blade is 180 mm.

[0010] Furthermore, the overall length of the hybrid element is 720 mm, and the length of each spiral blade is 180 mm.

[0011] Furthermore, the length A of the shell is 2160 mm and the diameter B is 180 mm.

[0012] Furthermore, the diameter C of the spiral tube is 10 mm.

[0013] Furthermore, the axial distance from the junction of the spiral injection branch pipe and the housing to the air inlet is 360mm, and the axial distance between the mixing element and the air inlet is 720mm.

[0014] To achieve the above objectives, in a second aspect, the present invention also provides a method for operating a static mixer jet structure based on an Archimedean spiral, employing the following technical solution: A method for operating a static mixer injection structure based on an Archimedean spiral, using the static mixer injection structure based on an Archimedean spiral as described in the first aspect, includes: hydrogen gas entering a spiral tube from an inlet pipe, and then entering the housing from multiple outlet pipes on the spiral tube to mix with natural gas.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, through the combination of multiple hydrogen nozzles arranged in an Archimedes spiral and a mixing element, can achieve uniform dispersion and injection of hydrogen in three-dimensional space, effectively improving the mixing uniformity of hydrogen with natural gas, avoiding hydrogen enrichment along the pipe wall due to density differences or excessively high local concentration, and significantly reducing the risk of material deterioration and leakage caused by hydrogen embrittlement.

[0016] 2. Based on the synergy of spatial spiral and co-current, this invention effectively suppresses eddy current generation while enhancing mixing, reducing overall flow resistance and improving conveying efficiency, which is conducive to achieving energy saving and stable operation of the system under high pressure and high flow conditions. Attached Figure Description

[0017] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0018] Figure 1 This is a schematic diagram of the structure of a conventional static mixer according to the present invention; Figure 2 This is a schematic diagram of the static mixer according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of the hybrid element in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the spiral jet branch pipe structure of Embodiment 1 of the present invention; Figure 5 This is a cloud map showing the outlet hydrogen molar concentration distribution of the conventional static mixer of the present invention; Figure 6 This is a cloud map showing the outlet hydrogen molar concentration distribution of the static mixer in Embodiment 1 of the present invention; The components are: 1. Housing; 2. Spiral jet branch pipe; 21. Inlet pipe; 22. Spiral pipe; 23. Outlet pipe; 24. Spiral pipe outlet; 3. Mixing element; 4. Inlet; 5. Outlet. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] A static mixer is a fluid mixing device with no internal moving parts. It achieves efficient mixing, dispersion, mass transfer, or heat transfer by dividing, shearing, rotating, and recombining fluids through specially designed stationary elements. It is compact, energy-efficient, and easy to install and maintain, and is widely used in continuous processes in industries such as chemical, environmental protection, and food processing.

[0022] Example 1: like Figure 1 As shown, the current static mixer's injection structure cannot achieve uniform dispersion of hydrogen in three-dimensional space, resulting in poor mixing uniformity. This leads to problems such as hydrogen enrichment or excessively high local concentrations along the pipe wall due to density differences.

[0023] To solve the above problems, such as Figure 2 As shown, this embodiment provides a static mixer injection structure based on an Archimedes spiral, including a housing 1, a spiral injection branch pipe 2 disposed within the housing 1, and a mixing element 3. The housing 1 is a circular tube, with an air inlet 4 and an air outlet 5 respectively disposed at both ends of the housing 1, and the spiral injection branch pipe 2 is located at the end of the housing 1 closest to the air inlet 4.

[0024] like Figure 3 As shown, the spiral jet branch pipe 2 includes an air inlet pipe 21, a spiral pipe 22 connected to the air inlet pipe 21, a plurality of air outlet pipes 23 disposed on the spiral pipe 22, and a spiral pipe outlet 24 opened on the spiral pipe 22. The air inlet pipe 21 penetrates the housing 1, the spiral pipe 22 is located inside the housing 1, and the air outlet of the air outlet pipe 23 faces the mixing element 3.

[0025] The spiral tube 22 is based on the Archimedean spiral design to achieve uniform dispersion and injection of hydrogen along a three-dimensional path; the diameter C of the spiral tube 22 is 10mm, and the orifice diameter of each outlet tube 23 is consistent with the diameter of the spiral tube 22.

[0026] The shell 1 adopts a fully enclosed structure design, forming a closed cavity inside. One end is provided with an inlet 4 for natural gas to enter, and the other end is provided with an outlet 5 for hydrogen-blended natural gas to exit. The shell 1 is a thin-walled cylindrical structure; the length A of the shell 1 is 2160mm, and the diameter B is 180mm.

[0027] The spiral injection branch pipe 2 is vertically connected to the housing 1 and extends along the Archimedean spiral spatial curve inside the housing 1. Five outlet pipes 23 are provided on the spiral injection branch pipe 2, with the same flow direction as the housing 1. A spiral pipe outlet 24 is provided at the spiral end for hydrogen injection, together forming a six-channel hydrogen injection structure.

[0028] like Figure 4As shown, the mixing element 3 is disposed within the mixing cavity of the housing 1 and consists of four axially arranged spiral blades. The mixing element 3 includes multiple spiral blades, each spiral blade comprising a first spiral blade and a second spiral blade connected to each other; the starting points of the spiral lines in adjacent spiral blades are staggered to improve the mixing effect.

[0029] The first and second spiral blades are left-handed and right-handed spiral blades, respectively, and adjacent spiral blades have opposite directions of rotation, further improving mixing uniformity. The outer ends of each spiral blade are in contact with the inner wall of the housing 1. The spiral blades are made of X80 round steel through bending.

[0030] The overall length D of the hybrid element 3 is 720 mm, and the length E of each spiral blade is 180 mm.

[0031] The axial distance F from the junction of the spiral jet branch pipe 2 and the housing 1 to the air inlet 4 is 360mm, and the axial distance G between the mixing element 3 and the air inlet 4 is 720mm.

[0032] like Figure 5 As shown, this embodiment utilizes multiple hydrogen nozzles arranged in an Archimedean spiral, combined with a mixing element, to achieve uniform dispersion and injection of hydrogen in three-dimensional space. This effectively improves the mixing uniformity between hydrogen and natural gas, preventing hydrogen from accumulating along the pipe wall due to density differences or excessively high local concentrations, significantly reducing the risk of material degradation and leakage caused by hydrogen embrittlement. Based on the synergistic effect of spatial spiral and co-current flow, eddy current generation is effectively suppressed while enhancing mixing, reducing overall flow resistance, and improving transportation efficiency. This is beneficial for achieving energy saving and stable operation of the system under high pressure and high flow conditions.

[0033] Example 2: This embodiment provides a working method for a static mixer injection structure based on an Archimedean spiral, using the static mixer injection structure based on an Archimedean spiral as described in Embodiment 1, including: hydrogen gas entering the spiral tube 22 from the inlet pipe 21, and then entering the housing 1 from multiple outlet pipes 23 on the spiral tube 22 to mix with natural gas.

[0034] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A static mixer jet structure based on the Archimedean spiral, characterized in that, It includes a housing (1), a spiral jet branch pipe (2) disposed within the housing (1), and a mixing element (3); The spiral jet branch pipe (2) includes an air inlet pipe (21), a spiral pipe (22) connected to the air inlet pipe (21), and a plurality of air outlet pipes (23) disposed on the spiral pipe (22); the spiral pipe (22) is an Archimedean spiral structure; The air inlet pipe (21) penetrates the housing (1), the spiral pipe (22) is located inside the housing (1), and the air outlet of the air outlet pipe (23) faces the mixing element (3).

2. The static mixer jet structure based on the Archimedean spiral as described in claim 1, characterized in that, The housing (1) has an air inlet (4) for natural gas to enter at one end and an air outlet (5) for hydrogen-blended natural gas to be output at the other end; the spiral injection branch pipe (2) is located at the end of the housing (1) near the air inlet (4).

3. The static mixer jet structure based on the Archimedean spiral as described in claim 1, characterized in that, The mixing element (3) is disposed in the mixing cavity of the housing (1); the mixing element (3) includes a plurality of spiral blades, each spiral blade including a first spiral blade and a second spiral blade connected to each other; the starting points of the spiral lines in adjacent spiral blades are staggered.

4. The static mixer jet structure based on the Archimedean spiral as described in claim 3, characterized in that, The first spiral blade and the second spiral blade are left-handed and right-handed spiral blades, respectively, and adjacent spiral blades have opposite directions of rotation.

5. The static mixer jet structure based on the Archimedean spiral as described in claim 3, characterized in that, The overall length of the hybrid element (3) is 720 mm, and the length of each spiral blade is 180 mm.

6. The static mixer jet structure based on the Archimedean spiral as described in claim 3, characterized in that, The overall length of the hybrid element (3) is 720 mm, and the length of each spiral blade is 180 mm.

7. The static mixer jet structure based on the Archimedean spiral as described in claim 1, characterized in that, The length A of the shell (1) is 2160mm and the diameter B is 180mm.

8. The static mixer jet structure based on the Archimedean spiral as described in claim 1, characterized in that, The diameter C of the spiral tube (22) is 10 mm.

9. The static mixer jet structure based on the Archimedean spiral as described in claim 1, characterized in that, The axial distance from the junction of the spiral jet branch pipe (2) and the housing (1) to the air inlet (4) is 360mm, and the axial distance between the mixing element (3) and the air inlet (4) is 720mm.

10. A working method for a static mixer jet structure based on an Archimedean spiral, characterized in that... The static mixer injection structure based on the Archimedes spiral as described in any one of claims 1-9 is used, comprising: hydrogen gas entering the spiral tube (22) from the inlet pipe (21), and then entering the housing (1) from the plurality of outlet pipes (23) on the spiral tube (22) to mix with natural gas.

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