A multi-stage mixing device for hydrogen-doped natural gas

Abstract

The utility model relates to natural gas blending technology field, and disclose a kind of multistage blending equipment of natural gas hydrogen blending, including first mixing box, the left side of first mixing box is fixedly connected with natural gas inlet pipe by flange, first mixing box bottom end is fixedly connected with hydrogen inlet pipe by flange, the right side of first mixing box is connected with second mixing box, second mixing box right side is fixedly connected with mixed gas outlet pipe by flange;First mixing component, the first mixing component includes disc and wind guide rotating tube;Blending pipe. By setting first mixing component, wind guide rotating tube drives disc rotation to scatter and mix the airflow passing, realize to the first grade blending of mixed gas, then mixed gas enters second mixing box cavity blending pipe, gas is increased in overall flow rate by air duct, since hydrogen is lighter in quality, easy to float in upper side, by setting second mixing component, carry out the second grade blending of mixed gas, further improve the uniformity of mixed gas.

Description

Technical Field

[0001] This utility model relates to the field of natural gas blending technology, and in particular to a multi-stage blending device for natural gas with hydrogen. Background Technology

[0002] Mixing hydrogen into natural gas and transporting it through existing long-distance natural gas pipelines or urban gas pipelines, or supplying hydrogen through pipelines from nearby hydrogen sources, and finally utilizing it at end users, is one of the current methods for large-scale, low-cost utilization of hydrogen energy.

[0003] For example, utility model application CN202220428709.1 discloses a natural gas hydrogen blending device, including a pipeline, a venturi tube, and a rectifier plate. The pipeline includes a main pipeline and a branch pipeline connected to each other. The venturi tube is fitted inside the main pipeline and closes the openings at both ends of the main pipeline. An intermediate cavity is formed between the outer surface of the venturi tube and the inner surface of the main pipeline. The intermediate cavity is connected to the branch pipeline. The venturi tube has an inlet that connects the intermediate cavity and the inner cavity of the venturi tube. One of the inlet end of the venturi tube and the inlet end of the branch pipeline is connected to the natural gas pipeline, and the other is connected to the hydrogen pipeline. The rectifier plate is located at the outlet end of the venturi tube and has multiple rectifier holes.

[0004] Existing technology uses the Venturi effect to adsorb hydrogen from natural gas before mixing. During mixing, hydrogen may rise rapidly due to buoyancy, resulting in excessively high hydrogen concentration at the top of the pipeline. This causes hydrogen and natural gas to separate into layers inside the pipeline, posing a safety hazard.

[0005] This application improves upon existing technology by proposing a multi-stage blending device for hydrogen blending in natural gas to solve the problems mentioned in the background art. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a multi-stage blending device for hydrogen blending in natural gas, solving the problems mentioned in the background section.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0008] A multi-stage blending device for natural gas and hydrogen includes a first mixing chamber, a natural gas inlet pipe fixedly connected to the left side of the first mixing chamber via a flange, a hydrogen inlet pipe fixedly connected to the bottom of the first mixing chamber via a flange, a second mixing chamber extending through the right side of the first mixing chamber, and a mixed gas outlet pipe fixedly connected to the right side of the second mixing chamber via a flange; a Venturi tube fixedly installed inside the first mixing chamber, the natural gas inlet pipe communicating with the Venturi tube, and the outlet of the hydrogen inlet pipe located below the outlet of the Venturi tube; a first mixing assembly, disposed at the bottom of the first mixing chamber for stirring the mixed gas, the first mixing assembly including a disc and a guide rotating pipe; and a blending pipe fixedly installed inside the second mixing chamber, the blending pipe having a through-duct for the mixed gas to be mixed and accelerated through the duct, a second mixing assembly disposed at the top of the middle position of the duct, the second mixing assembly including a second mounting column and a mixing fan blade.

[0009] According to the multi-stage blending equipment for natural gas with hydrogen, an air guide block is also fixedly installed at the top of the first mixing chamber. The air guide block is located above the first mixing component and is in the shape of a semi-cylinder.

[0010] According to the multi-stage blending equipment for natural gas with hydrogen, a first mounting column is movably connected to the right side of the disc, and the first mounting column is fixedly installed at the bottom of the first mixing chamber.

[0011] According to the multi-stage blending equipment for natural gas with hydrogen, a guide shroud is fixedly installed on the windward side of the left side of the disc, and a guide rotating pipe is fixedly installed on the outer wall of the disc. There are multiple sets of guide rotating pipes, which are arranged in a ring array on the outer wall of the disc. The guide rotating pipes are installed at an angle and have a trumpet-shaped appearance.

[0012] According to the aforementioned multi-stage blending equipment for natural gas with hydrogen, the air duct is wave-shaped, and the mixed gas is accelerated through the air duct before entering the mixed gas outlet pipe.

[0013] According to the aforementioned multi-stage blending equipment for natural gas with hydrogen, the second mounting column is fixedly installed in the recessed part at the top of the air duct cavity, and the mixing fan blade is movably installed at the end of the second mounting column away from the air duct.

[0014] This invention provides a multi-stage blending device for natural gas with hydrogen, which has the following advantages: By connecting the natural gas inlet pipe to the Venturi tube, and placing the hydrogen inlet pipe outlet below the Venturi tube outlet, the natural gas, after flowing out through the Venturi tube, adsorbs the hydrogen below, thus achieving initial mixing. A first mixing component is then installed, with a rotating air guide pipe driving a disc to disperse and mix the passing airflow, achieving primary blending. The mixed gas then enters the blending pipe within the second mixing chamber. As the gas passes through the duct, the overall flow velocity increases. Since hydrogen is lighter, it easily floats to the top. A second mounting column is fixedly installed at the top recess of the duct chamber, and a mixing fan blade is movably installed at the end of the second mounting column away from the duct. The mixed gas drives the mixing fan blade to rotate, further mixing the hydrogen and natural gas, preventing stratification or localized enrichment of the mixed gas, and ultimately achieving more uniform blending. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a multi-stage blending device for hydrogen blending of natural gas according to the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of the first mixing tank of a multi-stage blending device for hydrogen blending of natural gas according to this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the first mixing component of a multi-stage blending device for hydrogen blending of natural gas according to this utility model;

[0018] Figure 4 This is a schematic diagram of the second mixing tank structure of a multi-stage blending device for hydrogen blending of natural gas according to this utility model;

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of the blending pipe in a multi-stage blending device for hydrogen blending of natural gas according to this utility model.

[0020] Legend:

[0021] 10. Natural gas inlet pipe; 11. Hydrogen inlet pipe; 12. First mixing box; 13. Second mixing box; 14. Mixed gas outlet pipe; 15. Venturi tube; 16. Air guide block; 17. First mixing assembly; 18. Disc; 19. First mounting post; 20. Air guide rotary pipe; 21. Flow guide shroud; 22. Mixing pipe; 23. Air duct; 24. Second mounting post; 25. Mixing fan blade. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-5 As shown, this utility model is a multi-stage blending device for natural gas and hydrogen, including a first mixing tank 12. A natural gas inlet pipe 10 is fixedly connected to the left side of the first mixing tank 12 via a flange. A hydrogen inlet pipe 11 is fixedly connected to the bottom of the first mixing tank 12 via a flange. A second mixing tank 13 is connected through the right side of the first mixing tank 12. A mixed gas outlet pipe 14 is fixedly connected to the right side of the second mixing tank 13 via a flange. A Venturi tube 15 is fixedly installed inside the cavity of the first mixing tank 12. The natural gas inlet pipe 10 communicates with the Venturi tube 15, and the hydrogen inlet pipe 11... The air outlet is located below the air outlet of the venturi tube 15; the first mixing component 17 is located at the bottom of the first mixing chamber 12 and is used to stir the mixed gas. The first mixing component 17 includes a disc 18 and a guide rotary tube 20; the mixing pipe 22 is fixedly installed in the second mixing chamber 13 and has a duct 23 through it. The mixed gas is mixed and accelerated through the duct 23. The second mixing component is located at the top of the middle position of the duct 23. The second mixing component includes a second mounting column 24 and a mixing fan blade 25.

[0024] Specifically, natural gas enters the first mixing chamber 12 through the natural gas inlet pipe 10, and hydrogen enters the first mixing chamber 12 through the hydrogen inlet pipe 11. By connecting the natural gas inlet pipe 10 with the Venturi tube 15, and with the outlet of the hydrogen inlet pipe 11 located below the outlet of the Venturi tube 15, according to the Venturi effect, the natural gas flows out of the Venturi tube 15 and adsorbs the hydrogen below, thus achieving initial mixing of the natural gas and hydrogen. By setting up the first mixing component 17, the air guide rotary pipe 20 drives the disc 18 to rotate and disperse the passing airflow, achieving primary mixing of the mixed gas. Subsequently, the mixed gas enters the mixing pipe 22 in the second mixing chamber 13. The overall flow rate of the gas increases as it passes through the air duct 23. Since hydrogen is lighter, it is easier to float at the top. By setting up the second mixing component, the mixed gas is further mixed in a secondary manner, further improving the uniformity of the mixed gas.

[0025] Among them, such as Figure 1-2 As shown, an air guide block 16 is also fixedly installed at the top of the first mixing chamber 12. The air guide block 16 is located above the first mixing component 17 and is in the shape of a semi-cylinder.

[0026] Specifically, by fixing an air guide block 16 at the top of the first mixing chamber 12, the air guide block 16 is located above the first mixing assembly 17. The gas flows downward along the outer wall of the air guide block 16, which guides the airflow and helps to mix the gases.

[0027] Among them, such as Figure 3As shown, a first mounting post 19 is movably connected to the right side of the disc 18, and the first mounting post 19 is fixedly installed at the bottom end of the first mixing chamber 12. A guide shroud 21 is fixedly installed on the windward side of the left side of the disc 18, and a guide rotating pipe 20 is fixedly installed on the outer wall of the disc 18. There are multiple sets of guide rotating pipes 20, which are arranged in a ring array on the outer wall of the disc 18. The guide rotating pipes 20 are installed at an angle and have a trumpet-shaped appearance.

[0028] Specifically, by setting the disc 18 to be movably connected to the first mounting column 19, the first mounting column 19 is installed at the bottom of the first mixing chamber 12. The air guide rotating pipe 20 is fixedly installed on the outer wall of the disc 18. There are multiple sets of air guide rotating pipes 20, which are arranged in a ring array on the outer wall of the disc 18. By setting the air guide rotating pipe 20 to be installed in an inclined state, the air guide rotating pipe 20 has a trumpet shape. The gas passing through the inclined air guide rotating pipe 20 generates centrifugal force on the disc 18, driving the disc 18 to rotate, thereby causing the gas to rotate and mix.

[0029] Among them, such as Figure 4-5 As shown, the air duct 23 is wavy, and the mixed gas is accelerated through the air duct 23 before entering the mixed gas outlet pipe 14. The second mounting post 24 is fixedly installed in the recessed part at the top of the air duct 23 cavity, and the mixing fan blade 25 is movably installed at the end of the second mounting post 24 away from the air duct 23.

[0030] Specifically, by setting the air duct 23 to be wavy, the flow rate of the mixed gas increases through the air duct 23. The second mounting column 24 is fixedly installed in the recessed part at the top of the air duct 23 cavity. The mixing fan blade 25 is movably installed at the end of the second mounting column 24 away from the air duct 23. The mixed gas drives the mixing fan blade 25 to rotate, further mixing hydrogen and natural gas, avoiding the problem of stratification or local enrichment of the mixed gas, and finally achieving more uniform mixing.

[0031] The specific working principle of this utility model's multi-stage blending device for natural gas with hydrogen is as follows: A natural gas inlet pipe 10 is connected to a Venturi tube 15, and the outlet of the hydrogen inlet pipe 11 is located below the outlet of the Venturi tube 15. According to the Venturi effect, the natural gas flowing out of the Venturi tube 15 adsorbs the hydrogen below, thus achieving initial mixing of the natural gas and hydrogen. A first mixing component 17 is then installed, and the rotating air guide pipe 20 drives the rotating disc 18 to disperse and mix the passing airflow, achieving primary blending of the mixed gas. Subsequently, the mixed gas enters... The gas enters the mixing pipe 22 inside the second mixing chamber 13. The overall flow rate of the gas increases as it passes through the air duct 23. Since hydrogen is lighter, it tends to float at the top. By setting the air duct 23 to be wavy, the flow rate of the mixed gas through the air duct 23 increases. The second mounting column 24 is fixedly installed in the recessed part at the top of the air duct 23. The mixing fan blade 25 is movably installed at the end of the second mounting column 24 away from the air duct 23. The mixed gas drives the mixing fan blade 25 to rotate, further mixing the hydrogen and natural gas, avoiding the problem of stratification or local enrichment of the mixed gas, and ultimately achieving a more uniform mixing.

[0032] 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 claimed utility model.

Claims

1. A multi-stage blending device for hydrogen blending in natural gas, characterized in that, include: The first mixing box (12) has a natural gas inlet pipe (10) fixedly connected to the left side of the first mixing box (12) via a flange, a hydrogen inlet pipe (11) fixedly connected to the bottom end of the first mixing box (12) via a flange, and a second mixing box (13) is connected through the right side of the first mixing box (12), and a mixed gas outlet pipe (14) is fixedly connected to the right side of the second mixing box (13) via a flange. A venturi tube (15) is fixedly installed inside the first mixing box (12). The natural gas inlet pipe (10) is connected to the venturi tube (15), and the outlet of the hydrogen inlet pipe (11) is located below the outlet of the venturi tube (15). The first mixing component (17) is located at the bottom of the first mixing chamber (12) and is used to stir the mixed gas. The first mixing component (17) includes a disc (18) and a guide rotary pipe (20). The mixing pipe (22) is fixedly installed in the cavity of the second mixing box (13). The mixing pipe (22) is provided with a duct (23) through which the mixed gas is mixed and accelerated. A second mixing component is provided at the top of the middle position of the duct (23). The second mixing component includes a second mounting column (24) and a mixing fan blade (25).

2. The multi-stage blending equipment for hydrogen blending of natural gas according to claim 1, characterized in that: A guide block (16) is also fixedly installed at the top of the cavity of the first mixing box (12). The guide block (16) is located above the first mixing component (17) and is in the shape of a semi-cylinder.

3. The multi-stage blending equipment for natural gas hydrogen blending according to claim 1, characterized in that: The right side of the disc (18) is movably connected to a first mounting post (19), which is fixedly installed at the bottom of the cavity of the first mixing box (12).

4. The multi-stage blending equipment for hydrogen blending of natural gas according to claim 3, characterized in that: A shroud (21) is fixedly installed on the windward side of the left side of the disc (18). A rotating air guide pipe (20) is fixedly installed on the outer wall of the disc (18). There are multiple sets of rotating air guide pipes (20). The multiple sets of rotating air guide pipes (20) are arranged in a ring array on the outer wall of the disc (18). The rotating air guide pipes (20) are installed in an inclined state. The rotating air guide pipes (20) have a trumpet-shaped appearance.

5. The multi-stage blending equipment for hydrogen blending of natural gas according to claim 1, characterized in that: The air duct (23) is wavy, and the mixed gas is accelerated through the air duct (23) and then enters the mixed gas outlet pipe (14).

6. The multi-stage blending equipment for hydrogen blending of natural gas according to claim 1, characterized in that: The second mounting post (24) is fixedly installed in the recessed part at the top of the air duct (23), and the mixing fan blade (25) is movably installed at the end of the second mounting post (24) away from the air duct (23).

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